WO2011010779A1 - Hinge apparatus for portable terminal - Google Patents

Abstract

According to an exemplanary embodiment of the present invention, a hinge apparatus for a portable terminal rotates a first body of the portable terminal on a second body in the preset range of rotation. The invention comprises a main hinge module and a sub hinge module configured to be separated from each other and to connect with the first and second bodies. The main hinge module and the sub hinge module are connected through a first frame fixed to the first body to form a first hinge shaft of the first body, are connected through a second frame fixed to the second body to form a second hinge shaft that is parallel to the first hinge shaft, and realize a free-stop open zone in which the first and second bodies are freely rotated in the open range of 0 to 360 degrees, by comprising a gear unit and a cam unit on the same axle of each of the first and second hinge shafts.

Description

Hinge device for mobile terminal

An exemplary embodiment of the present invention relates to a hinge device for a portable terminal, and more particularly, to a hinge device for a portable terminal to enable the cover to rotate 360 degrees by folding.

In general, mobile terminals such as mobile phones, PDAs, notebook computers, and DMB phones are widely used to wirelessly use services such as communication and broadcasting while moving in places other than a fixed location.

The mobile terminal is one of the essential necessities that are indispensable in order to enjoy the convenience of life according to the information age. Especially, the mobile terminal is widely distributed to elementary, middle and high school students and the elderly.

As mentioned above, as the demand and user base rapidly increase in recent years, the portable terminal has been expected to expect a product to which new design or function is given.

The portable terminal is coupled to a main body provided with a keypad and a cover provided with a display panel so as to be open and close to each other, and may be classified into a folding method, a sliding method, and a swing method according to the opening / closing structure of the cover for the main body.

In particular, the portable terminal for opening and closing the cover in the folder method is one of the most applied in recent years because of various advantages such as easy to use, less trouble, and a stylish design.

Such a folder-type portable terminal can open and close the cover in a vertical direction with respect to the main body through a hinge device, the hinge device is composed of a fixed cam, a mobile cam, an elastic member and a hinge shaft, and the like of these components The interaction allows the cover to be opened or closed at a predetermined angle (approximately 150-180).

On the other hand, in recent years, in order to utilize the display of the portable terminal as a relatively large area, the development of a hinge device capable of rotating the cover 360 degrees with respect to the main body is required.

In this industry, two hinge shafts are provided, and a fixed cam, a mobile cam, and an elastic member are mounted on each hinge shaft, and the development of a hinge device including a gear that is engaged with each hinge shaft is immersed.

By the way, in the prior art, when implementing the 360 degrees of the cover with two interlocking gears in a structure in which the axis of the hinge axis is determined, since the distance between the axes becomes the pitch circle of the two gears, an addendum is formed in the pitch circle. When added, the hinge arrangement is larger than the case design of the lid and body.

This can solve about 150 ~ 180 opening of the cover through the design of the cover and the main body case, but because of the size of the hinge device has a problem that the design of the case does not implement the 360 degree operation of the cover.

In addition, since the hinge device of the prior art is configured as a structure in which both ends of each hinge shaft are coupled to the case of the main body and the cover, there is a problem in the operability of the entire device such as the hinge shaft is deformed or the gears are cracked during repeated opening and closing of the cover. It also causes problems.

On the other hand, as the user's taste is diversified, the appearance of the conventional mobile terminals has been developed based on the appearance suitable for performing a communication function such as voice call and message transmission, so it is inconvenient to use a multimedia service. There is this.

For example, since a display device of a general portable terminal is set to be long in a vertical direction, it is inconvenient to use multimedia media services such as digital multimedia broadcasting (DMB), video, and games.

Exemplary embodiments of the present invention have been created to improve the above problems, and ultimately, a portable terminal capable of rotating the cover of the portable terminal 360 degrees in a folding manner while promoting structural stability of the entire device. Provide a hinge device.

To this end, the hinge device for a portable terminal according to an exemplary embodiment of the present invention is for rotating the first body of the portable terminal as a preset rotation range with respect to the second body, and is separated from each other and separated from each other. Each main hinge module and sub hinge module configured to be connected to,

The main hinge module and the sub hinge module are connected through a first frame fixed to the first body, form a first hinge axis of the first body, and are connected through a second frame fixed to the second body. A second hinge axis parallel to the first hinge axis is formed, and the gear unit and the cam unit are formed on the coaxial axis of each of the first and second hinge axes to rotate the first and second bodies in an open range of 0 to 360 degrees. Implement this free-stop open.

In the hinge device for a portable terminal, the main hinge module is rotatably mounted to the first hinge case on a coaxial axis of the first hinge case and a first hinge case rotatably connected to the first and second bodies. And a second main rotating shaft rotatably mounted to the first hinge case on a coaxial axis of the second hinge shaft in parallel with the first main rotating shaft.

In the hinge device for the portable terminal, the main hinge module may configure a main gear unit and a main cam unit on the first and second main rotation shafts.

In the hinge device for a portable terminal, the main hinge module may include a main elastic member mounted on the first and second main rotary shafts and exerting a bullet force to the main cam unit.

In the hinge device for a portable terminal, the sub-hinge module includes a second hinge case rotatably connected to the first and second bodies separately from the first hinge case, and the first hinge shaft on the coaxial axis of the first hinge shaft. A first sub-rotation shaft rotatably mounted to a second hinge case and connected to the first main rotation shaft through the first frame, and coaxially with the second hinge shaft to the second hinge case in parallel with the first sub-rotation shaft; The second sub-rotation shaft may be rotatably mounted and connected to the second main rotation shaft through the second frame.

In the hinge device for a portable terminal, the sub-hinge module may configure a sub gear unit and a sub cam unit on the first and second sub-rotation shafts.

In the hinge device for a portable terminal, the sub-hinge module may include a sub-elastic member mounted on the first and second sub-rotation shafts to exert a force of discrimination with the sub cam unit.

In the hinge device for the portable terminal, the second hinge case may form a movement path through which a flexible printed circuit electrically connected to the circuit devices of the first and second bodies may pass.

In the hinge device for a portable terminal, the first main rotation axis and the first sub rotation axis may be connected through the first frame to form the first hinge axis.

In the hinge device for the portable terminal, the second main rotation axis and the second sub rotation axis may be connected through the second frame to form the second hinge axis.

In the hinge device for a portable terminal, the main gear unit is rotatably installed inside the first and second main drive gears and the first hinge case are fixed to the first and second main rotation shaft, respectively. And a first main driven gear meshing with the first main driving gear and rotatably installed in the first hinge case and intermeshing with the first main driven gear and the second main driving gear. It may comprise a main driven gear.

In the hinge device for the portable terminal, the sub gear unit is rotatably installed in the first and second sub-drive gears and the second hinge case, which are installed to be fixed to the first and second sub-rotation shafts, respectively. And a first sub-driven gear that meshes with the first sub-drive gear and a second sub-drive gear rotatably installed in the second hinge case and meshing with the first sub-driven gear and the second sub-drive gear. Sub-driven gears.

In the hinge device for a portable terminal, the main cam unit is rotatably mounted to the first and second main rotation shafts separately from the first and second main drive gears, respectively, and the first and second main shafts are respectively rotatable. It may include a main rotary cam coupled to the drive gear, and a main movable cam installed in the axial direction on the first and the second main rotary shaft so as to be linearly movable in contact with each of the main rotary cams.

In the hinge device for the portable terminal, each of the first and second main drive gears is insert injection molded to the first and second main rotary shafts, respectively, and a pair of coupling protrusions that can be coupled to the respective main rotary cams. May be formed integrally.

In the hinge device for a portable terminal, each main rotary cam may be formed with a pair of coupling grooves into which the coupling protrusions can be fitted.

In the hinge device for a portable terminal, the main mobile cam may form first and second cam portions in cam contact with each of the main rotary cams, and the first and second cam portions may be integrally formed.

In the hinge device for a portable terminal, the sub cam unit is capable of linearly moving along the axial direction to a sub rotary cam formed integrally with the first and second sub driving gears, respectively, and the first and second sub rotating shafts. It may include a sub-moving cam is installed so as to be in contact with the cam cam and each sub-rotation cam.

In the hinge device for the portable terminal, each of the first and second sub-drive gears and the sub-rotary cams may be formed by insert injection molding on the first and second sub-rotation shafts.

In the hinge device for a portable terminal, the sub moving cam may include third and fourth cam portions in cam contact with each of the sub-rotary cams, and the third and fourth cam portions may be integrally formed.

In the hinge device for the portable terminal, the main hinge module is installed to be fixed to the first hinge case with the first and second main driven gears interposed therebetween so that each of the first and second main rotary shafts and the respective The apparatus may further include first and second main holders rotatably supporting the first and second main driven gears.

In the hinge device for a portable terminal, the first main holder is fixed to the first hinge case through a bolt, and a pair of agents to which the respective first and second main rotary shafts can be rotatably fitted. 1 mounting hole may be formed.

In the hinge device for a portable terminal, the second main holder is fixedly installed on a fixing protrusion formed in the first hinge case, and a pair of second through which the first and second main driving gears pass. Mounting holes may be formed.

In the hinge device for the portable terminal, each of the first and second main holders may be formed with a pair of first mounting grooves rotatably supporting the first and second main driven gears.

In the hinge device for the portable terminal, the sub-hinge module is installed to be fixed to the second hinge case with the first and second sub-driven gears interposed therebetween and at one end of each of the first and second sub-rotation shafts. First and second sub-holders rotatably supporting the first and second sub-driven gears, and fixed to the second hinge case to rotate the other end of each of the first and second sub-rotation shafts. It may further include a third sub holder that possibly supports.

In the hinge device for the portable terminal, the first sub holder is fixed to the second hinge case through a bolt, and as long as one end of each of the first and second sub rotating shafts can be rotatably fitted. A pair of third mounting holes may be formed.

In the hinge device for a portable terminal, the second sub holder is fixedly installed on a fixing protrusion formed in the second hinge case, and a pair of fourths through which the first and second sub driving gears pass. Mounting holes may be formed.

In the hinge device for the portable terminal, the third sub holder is fixed to the second hinge case through a bolt, and the other one end of each of the first and second sub rotating shafts can be rotatably fitted. The fifth mounting hole may be formed.

In the hinge device for the portable terminal, each of the first and second sub holders may be provided with a pair of second mounting grooves rotatably supporting the first and second sub-driven gears.

In the hinge device for the portable terminal, the third sub holder may form a movement path through which a flexible printed circuit electrically connected to the circuit devices of the first and second bodies may pass.

In the hinge device for a portable terminal, the main elastic member may be formed as a compression coil spring mounted to the first and second main rotary shafts, respectively.

In the hinge device for the portable terminal, the sub-elastic member may be formed as a wave spring having a pair of shaft holes into which the respective first and second sub-rotation shafts can be fitted.

According to the hinge device for a mobile terminal according to the exemplary embodiment of the present invention as described above, the first body is rotated 360 degrees with respect to the second body in a state in which the first and second bodies face 0 degrees, and an arbitrary angle. Free-stop open, which can be stopped at, can be implemented to improve usability.

In addition, in the present exemplary embodiment, since the main hinge module generates a driving torque for realizing the pre-stop operation, the main hinge module includes a sub hinge module that is separated from, connected to, and interlocked with the main hinge module. It is possible to support the hinge operation, and to suppress the play with the second body when the first body is opened.

In addition, in the present embodiment, when the distance between the axes of the first and second hinge shafts is determined to be the same, the first and second hinge shafts are connected through the driving gears and the driven gears. It can be made small, the size and thickness of the entire hinge device can be reduced, and the structural stability of the portable terminal can be improved.

In this embodiment, since the fourth through part of the second hinge case is formed as a dummy part for supporting the relative rotation of the first and second bodies, the dummy part does not need to be assembled separately, thereby simplifying the assembly process and parts. Can be.

Furthermore, in the present embodiment, since the fourth through portion as the dummy portion can absorb the impact of opening and closing the first and second bodies, the first and second hinge shafts are deformed by the impact, or the driving gears and the driven gear Can be prevented from being damaged.

Therefore, in this embodiment, it is possible to solve the problem of the operability of the hinge device due to the deformation of the first and second hinge shafts and the damage of the gears.

Further, in the present embodiment, since the movement path of the flexible printed circuit is formed inside the second hinge case through the third sub holder, the flexible printed circuit can be easily mounted and wired.

Since these drawings are for reference in describing exemplary embodiments of the present invention, the technical idea of the present invention should not be construed as being limited to the accompanying drawings.

1 is a perspective view illustrating a hinge device for a portable terminal according to an exemplary embodiment of the present invention.

2 is a front configuration diagram of FIG. 1.

3 is a partially exploded perspective view of FIG. 1.

4 is a front configuration diagram of FIG. 3.

5 is an overall exploded perspective view of FIG. 1.

6 is a view showing an operating state of the hinge device for a mobile terminal according to an exemplary embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

1 is a combined perspective view showing a hinge device for a portable terminal according to an exemplary embodiment of the present invention, Figure 2 is a front configuration of Figure 1, Figure 3 is a partially exploded perspective view of Figure 1, Figure 4 3 is a front configuration diagram, and FIG. 5 is an overall exploded perspective view of FIG. 1.

Referring to the drawings, the hinge device 100 according to the exemplary embodiment of the present invention may be applied to the portable terminal 1 including the first body 3 as a cover and the second body 5 as the main body.

The portable terminal 1 is a typical mobile phone of a folder opening and closing method in which the first and second bodies 3 and 5 rotate in the vertical direction or the left and right directions through the hinge device 100 according to the embodiment according to the position. Can be mentioned.

The portable terminal 1 may provide a multimedia service such as text data input, DMB, video, game, etc. while basically performing a mobile communication function such as voice / video call and message transmission.

Here, the first body 3 forms a display unit (not shown) such as a liquid crystal panel or a touch panel on the front surface of the first body 3 based on the open state with respect to the second body 5.

The second body 5 constitutes a keypad portion (not shown) on the front surface facing the first body 3 on the basis of the closed state facing the first body 3.

In this case, the first and second bodies 3 and 5 are formed as rectangular bodies having a length longer than the width, and can be mutually rotated in the width direction or the length direction through the hinge device 100 according to the present embodiment. Is fitted.

As an example, when the first and second bodies 3 and 5 are configured to be rotatable in the width direction through the hinge device 100 according to the present embodiment, the second body 5 may include alphabets and Korean characters. A keypad portion (not shown) of a qwerty keyboard arrangement capable of inputting can be employed.

Accordingly, the portable terminal 1 to which the exemplary embodiment of the present invention is applied may include a so-called qwerty phone or a game phone.

An exemplary embodiment of the present invention is not particularly limited to that the mobile terminal 1 as described above is applied only to a general mobile phone capable of mobile communication.

That is, the portable terminal 1 according to the exemplary embodiment of the present invention may be a personal digital assistant (PDA), a smart phone, a hand held PC, an MP3 / MP4 player, a game machine, a netbook, a notebook, or the like. It may be applied to the same portable electric and electronic device.

The portable electronic device may include a predetermined communication module such as a code division multiplexing access (CDMA) module, a Bluetooth module, an infrared communication module (IrDA), a wired or wireless LAN card, and perform a multimedia play function such as a game item. May be provided with a microprocessor.

The hinge device 100 according to the exemplary embodiment of the present invention applied to the portable terminal 1 as described above opens the preset rotation range of the first and second bodies 3 and 5, that is, 0 to 360 degrees. It is possible to implement free-stop opening free of rotation of the first and second bodies 3 and 5 in the range.

Accordingly, the portable terminal 1 to which the exemplary embodiment of the present invention is applied may open the first body 3 with respect to the second body 5 by 360 degrees.

As a result, the user can use the general mobile communication function in a state in which the first body 3 is opened with respect to the second body 5 at a predetermined interval, and the first body 3 is connected to the second body 5. With the 360 degree open, multimedia information such as text information, image (picture, video) information, and terrestrial broadcasting can be conveniently used.

To this end, the hinge device 100 for a portable terminal according to an exemplary embodiment of the present invention basically includes a main hinge module 101 and a sub hinge module 301.

The main hinge module 101 and the sub-hinge module 301 are separated from each other between the first and second bodies 3 and 5 and are connected to the first and second bodies 3 and 5 in a separated state. The bar is configured to be connected to one side and the other side hinge arm (not shown) of the first and second bodies 3, 5.

That is, the main hinge module 101 is configured to be connected to one side hinge arms (not shown) of the first and second bodies 3 and 5, and implements the aforementioned free-stop operation. To generate a driving torque.

The sub-hinge module 301 is configured to be connected to the other side hinge arms (not shown) of the first and second bodies 3 and 5, and interlocks with the main hinge module 101 and the main hinge module 101. It supports the hinge operation, and serves to suppress the play with the second body 5 when the first body 3 is open.

In this case, the main hinge module 101 and the sub-hinge module 301 are connected to each other through the first frame 103 fixed to the first body 3 to support the rotation of the first body 3. The first hinge shaft 105 is formed.

The main hinge module 101 and the sub hinge module 301 are connected to each other through a second frame 303 fixed to the second body 5 to support rotation of the second body 5. 2 hinge shaft 305 is formed.

Here, the first and second hinge axes 105 and 305 form parallel axes to each other and form a rotation center point on one side and the other one side hinge arm (not shown) of the first and second bodies 3 and 5. .

Meanwhile, the main hinge module 101 and the sub hinge module 301 constitute a gear unit and a cam unit which will be described later on the coaxial axis of the first and second hinge shafts 105 and 305.

Accordingly, the hinge device 100 for a portable terminal according to the present embodiment is free to rotate the first and second bodies in an open range of 0 to 360 degrees through the main hinge module 101 and the sub hinge module 301. Free-stop open can be implemented.

Hereinafter, the configuration of the main hinge module 101 and the sub hinge module 301 according to the present embodiment as described above will be described in more detail.

In the present embodiment, the main hinge module 101, the first hinge case 110, the first main rotary shaft 120, the second main rotary shaft 130, the main gear unit 140, the main cam It comprises a unit 150 and the main elastic member 160.

The first hinge case 110 is for mounting and accommodating the following components, and the components of the first hinge case 110 are rotatable on one side hinge arms (not shown) of the first and second bodies 3 and 5. Connected.

The first hinge case 110 is formed as a pair of cases that can be mutually coupled and separated through the bolt (B), the case has a variety of protrusions, ribs, grooves, holes, etc. for substantially supporting the components The accessory elements are provided.

The first hinge case 110 forms an inner space while a pair of cases are coupled to each other, and on one side thereof, a pair of first through-holes 111 connected to the inner space are formed, and the other side surface thereof. A pair of second through-holes 112 are formed in the inner space.

Here, the first and second through parts 111 and 112 are formed as cylindrical protrusions having circular holes, and are connected to one side hinge arms (not shown) of the first and second bodies 3 and 5. It serves to support the relative rotation of the first and second body (3, 5).

In this case, the first through part 111 is a part supporting one end of the first and second main rotary shafts 120 and 130 which will be described later, and the second through part 112 is the first and second parts. The other end of the main rotating shaft (120, 130) is supported and the other end is a portion that is drawn out through.

Reference numeral 115, which is not described in the drawing, indicates a bolt fastening hole for fastening a pair of cases through the bolt B to form the first hinge case 110, and 117 indicates that the bolt B may be engaged. It shows the binding protrusion.

The first main axis of rotation 120 is for supporting the rotation of the first body 3, so as to be rotatable inside the first hinge case 110 on the coaxial of the first hinge shaft 105 as mentioned above It is mounted, and is installed to be substantially connected to the first body (3) of the portable terminal (1).

Here, the first main rotary shaft 120 has one side end supported by the first through part 111 of the first hinge case 110 (the upper side in the drawing), and the other one end thereof has the second through part 112. : It is mounted so as to partially protrude to the outside through the upper position in the drawing).

In addition, a first ring groove 121 is formed at one end of the first main rotation shaft 120, and the first main rotation shaft 120 is rotatable to the first hinge case 110 in the first ring groove 121. The first ring member 123 as an E-ring for fast coupling is mounted.

In addition, one side end of the first main rotation shaft 120 guides the elastic deformation of the main elastic member 160, which will be described later, and a first spring guide having a bush shape for supporting rotation of the rotation shaft 120 ( 125 is mounted, and the first spring guide 125 is mounted on the first through part 111 of the first hinge case 110.

The second main axis of rotation 130 is for supporting the rotation of the second body 5, the first hinge in parallel with the first main axis of rotation 120 on the coaxial of the second hinge axis 305 mentioned It is rotatably mounted in the case 110 and is installed to be substantially connected to the second body 5 of the portable terminal 1.

Here, the second main rotary shaft 130 has one side end supported by the first through part 111 of the first hinge case 110 (the lower side in the drawing), and the other one end thereof has the second through part 112. : It is mounted so as to partially protrude to the outside through the lower position in the drawing).

In addition, a second ring groove 131 is formed at one end of the second main rotation shaft 130, and the second main rotation shaft 130 is rotatable to the first hinge case 110 in the second ring groove 131. The second ring member 133 as an E-ring for fast fitting is mounted.

In addition, one side end of the second main rotary shaft 130 guides the elastic deformation of the main elastic member 160, which will be described later, and a second spring guide having a bush shape for supporting the rotation of the rotary shaft 130 ( As the bar 135 is mounted, the second spring guide 135 is mounted on the first through part 111 of the first hinge case 110.

The main gear unit 140 includes first and second main drive gears 141 and 142 and first and second main driven gears 145 and 146.

The first and second main drive gears 141 and 142 are spur gears, which are installed to be fixed to the first and second main rotation shafts 120 and 130, respectively, preferably the first and second main rotation shafts 120. And insert injection molding on 130).

Here, each of the first and second main drive gears 141 and 142 is integrally formed with a pair of engaging projections 143 and 144 protruding outward from the concentric circles of the gear.

The first main driven gear 145 (also referred to as "idle gear" in the art) is rotatably installed in the first hinge case 110 in response to the first main drive gear 141.

The first main driven gear 145 is meshed with the first main driving gear 141 and is rotatably mounted in a direction opposite to the rotation direction of the first main rotation shaft 120.

In addition, the second main driven gear 146 is rotatably installed in the first hinge case 110 in response to the second main driving gear 142.

The second main driven gear 146 meshes with the first main driven gear 145 and the second main driving gear 142, and is rotatable in a direction opposite to the rotational direction of the second main rotating shaft 130. Is mounted.

The second main driven gear 146 meshes with the first main driven gear 145 and the second main driving gear 142, and thus rotates in a direction opposite to the rotation direction of the first main driven gear 145. And, it serves to transmit the rotational force to the second main rotation shaft 130 through the second main drive gear 142.

That is, when the first main drive gear 141 rotates in the forward direction as the first main rotation shaft 120 rotates according to the rotation of the first body 3, the first main driven gear 145 moves in the reverse direction. The second main driven gear 146 rotates in the forward direction.

Therefore, since the second main drive gear 142 is meshed with the second main driven gear 146, the second main rotation shaft 130 rotates in the reverse direction opposite to the rotation direction of the first main rotation shaft 120. do.

Meanwhile, the main hinge module 101 according to the present embodiment includes the first and second main rotary shafts 120 and 130 and the first and second main driven gears 145 and 146 inside the first hinge case 110. It includes a first and second main holder (210, 220) for rotatably supporting the.

The first and second main holders 210 and 220 are fixed to the first hinge case 110 with the first and second main driven gears 145 and 146 therebetween.

In this case, the first main holder 210 may be fixed to the first hinge case 110 through the bolt B, and the first and second main rotation shafts 120 and 130 may be rotatably fitted. A pair of first mounting holes 211 are formed.

The second main holder 220 is fixed to the fixing protrusion 221 formed on the first hinge case 110, and as long as the first and second main driving gears 141 and 142 can pass therethrough. The pair of second mounting holes 223 are formed.

Here, the second main holder 220 forms a fixing groove 225 into which the fixing protrusion 221 of the first hinge case 110 can be fitted.

In addition, each of the first and second main holders 210 and 220 is provided with a pair of first mounting grooves 218 rotatably supporting the first and second main driven gears 145 and 146. .

The main cam unit 150 includes a main rotating cam 151 and a main moving cam 155.

In the above, the main rotary cam 151 is rotatably mounted to the first and second main rotary shafts 120 and 130 separately from the first and second main drive gears 141 and 142, respectively.

The main rotary cam 151 is coupled to the coupling protrusions 143 and 144 of the first and second main drive gears 141 and 142, respectively, and the first and second main drive gears 141 and 142 are coupled to each other. A pair of coupling grooves 152 into which the protrusions 143 and 144 can be fitted is formed, respectively.

Here, each of the main rotary cam 151 has an insertion hole that can be fitted to the first and second main rotary shafts 120 and 130, as mentioned above, the first and second in the open range of 0 to 360 degrees The cam diagram is configured to be kept constant from the beginning to the end so that the rotation of the bodies 3 and 5 can implement free-stop opening freely.

The main cam 155 is installed on the first and second main rotary shafts 120 and 130 to linearly move along the axial direction.

The main mobile cam 155 has a pair of insertion holes 155a into which the first and second main rotary shafts 120 and 130 can be fitted, and each main rotary cam 151 contacts with each other. The first and second cam portions 156 and 157 are integrally formed.

That is, the main moving cam 155 is the first and second main rotation shaft (120, 130) is inserted into the insertion hole (155a) and is linearly moved along the axis direction of the rotation shaft (120, 130).

In this case, the cam diagrams from the beginning to the end of the first and second cam portions 156 and 157 can implement free-stop opening in which the first and second bodies 3 and 5 can be freely rotated. Configure to remain constant.

In the above, each main rotary cam 151 is not formed integrally with the first and second main drive gears (141, 142), the reason for configuring to be able to be coupled to these drive gears (141, 142) Since a large torque is required to implement free-stop opening of the first and second bodies 3 and 5, the torque causes the durability of the first and second main rotary shafts 120 and 130 to be reduced. This is to prevent deterioration.

On the other hand, the main elastic member 160 is for the main mobile cam 155 to be in close contact with the main rotary cam 151 to exert elastic force to the main mobile cam 155 so that they can come in contact with each other cam.

The main elastic member 160 is composed of a compression coil spring 161 mounted to the first and second main rotation shafts 120 and 130, respectively, the compression coil spring 161 has one end of the main moving cam 155. ) And the other end is supported by the first and second spring guides 125 and 135 of each of the main shafts 120 and 130.

In the present embodiment, the sub-hinge module 301 includes a second hinge case 310, a first sub rotation shaft 320, a second sub rotation shaft 330, a sub gear unit 340, and a sub cam unit. And a sub elastic member 360.

The second hinge case 310 is for mounting and accommodating the following components, and separates the first and second bodies 3 and 5 from the first hinge case 110 of the main hinge module 101. It is rotatably connected to the other side hinge arm (not shown).

The second hinge case 310 is formed as a pair of cases that can be mutually coupled and separated through the bolt (B), the case has a variety of protrusions, ribs, grooves, holes, etc. for substantially supporting the components The accessory elements are provided.

The second hinge case 310 forms an inner space while a pair of cases are coupled to each other, and a pair of third through parts 311 connected to the inner space are formed at one side thereof, and the other one side surface thereof. A pair of fourth through parts 312 connected to the inner space are formed in the inner side of the inner space.

Here, the third and fourth through parts 311 and 312 are formed as cylindrical protrusions having circular holes, and are connected to other hinge arms (not shown) of the first and second bodies 3 and 5. It serves to support the relative rotation of the first and second body (3, 5).

In this case, the third through part 311 supports one end of the first and second sub-rotation shafts 320 and 330 which will be described later, and one end thereof penetrates and is drawn out to the outside. The part 312 is a dummy part connected to the other side hinge arm (not shown) of the first and second bodies 3, 5.

Here, the third through part 311 faces the first through part 111 of the first hinge case 110 in which the other end portions of the first and second main rotation shafts 120 and 130 are drawn out. do.

On the other hand, the sub-hinge module 301 according to the present embodiment is provided with a flexible printed circuit 390 for electrically connecting the circuit devices (not shown) of the first and second bodies (3, 5), The flexible printed circuit 390 may include a flexible PCB (FPCB) or a micro coaxial cable (MCX) that is widely used in the art.

The flexible printed circuit 390 passes through the inside of the second hinge case 310 and is connected to the circuit devices of the first and second bodies 3 and 5, and the second hinge case 310 is The flexible printed circuit 390 forms a movement path 314 through which it can pass.

That is, the flexible printed circuit 390 passes through the movement path 314 of the second hinge case 310 and penetrates through the fourth through part 312 of the second hinge case 310 to allow the first and second to pass through. It is connected to the circuit arrangement of the bodies 3 and 5.

Reference numeral 315, which is not described in the drawing, indicates a bolt fastening hole for fastening a pair of cases through the bolt B to form the second hinge case 310.

The first sub-rotation shaft 320 is for supporting the rotation of the first body 3, and rotatably inside the second hinge case 310 on the coaxial axis of the first hinge shaft 105 mentioned above. It is mounted, and is installed to be substantially connected to the first body (3) of the portable terminal (1).

That is, the first sub axis of rotation 320 is connected to the first main axis of rotation 120 of the main hinge module 101 through the first frame 103 of the predetermined length.

Accordingly, the first main axis of rotation 120 and the first sub axis of rotation 320 are connected to each other through the first frame 103 to form a first hinge axis 105, the first frame 103 is It is fixed to the first body 3 of the portable terminal 1 through a fastening means such as a bolt.

Here, the first sub-rotation shaft 320 penetrates through the penetrating portion 311 in a state in which one end thereof is supported by the third penetrating portion 311 (located on the upper side in the drawing) of the second hinge case 310. Protrudes to the other end is mounted to be located inside the second hinge case (310).

In addition, a third ring groove 321 is formed at one end of the first sub rotating shaft 320, and the first sub rotating shaft 320 is rotatable to the second hinge case 310 in the third ring groove 321. And a third ring member 323 as an E-ring for fast fitting.

The second sub axis of rotation 330 is for supporting the rotation of the second body 5, the second hinge in parallel with the first sub axis of rotation 320 on the coaxial of the second hinge axis 305 mentioned It is rotatably mounted in the case 310 and is installed to be substantially connected to the second body 5 of the portable terminal 1.

That is, the second sub rotary shaft 330 is connected to the second main rotary shaft 130 of the main hinge module 101 through the second frame 303 of the predetermined length.

Accordingly, the second main axis of rotation 130 and the second sub axis of rotation 330 are connected to each other through a second frame 303 to form a second hinge axis 305, the second frame 303 is It is fixed to the second body 5 of the portable terminal 1 through a fastening means such as a bolt.

Here, the second sub-rotation shaft 330 penetrates through the penetrating portion 311 in a state in which one end thereof is supported by the third penetrating portion 311 (located below in the drawing) of the second hinge case 310. Protrudes to the other end is mounted to be located inside the second hinge case (310).

In addition, a fourth ring groove 331 is formed at one end of the second sub rotating shaft 330, and the second sub rotating shaft 330 is rotatable to the second hinge case 310 in the fourth ring groove 331. And a fourth ring member 333 as an E-ring for fast fitting.

The sub gear unit 340 includes first and second sub driving gears 341 and 342 and first and second sub driven gears 345 and 346.

The first and second sub-drive gears 341 and 342 are spur gears, which are installed to be fixed to the first and second sub-rotation shafts 320 and 330, respectively, and preferably the first and second sub-rotation shafts 320. And insert injection molding on 330, respectively.

The first sub-driven gear 345 (also referred to as "idle gear" in the art) is rotatably installed in the second hinge case 310 in response to the first sub-drive gear 341.

The first sub-driven gear 345 is meshed with the first sub-drive gear 341, and is rotatably mounted in a direction opposite to the rotation direction of the first sub-rotation shaft 320.

In addition, the second sub-driven gear 346 is rotatably installed in the second hinge case 310 in correspondence with the second sub-drive gear 342.

The second sub-driven gear 346 meshes with the first sub-driven gear 345 and the second sub-drive gear 342 so as to be rotatable in a direction opposite to the rotational direction of the second sub-rotation shaft 330. Is mounted.

The second sub-driven gear 346 is meshed with the first sub-driven gear 345 and the second sub-drive gear 342 so as to rotate in a direction opposite to the rotational direction of the first sub-driven gear 345. In addition, the rotational force is transmitted to the second sub-rotation shaft 330 through the second sub-drive gear 342.

That is, when the first sub-drive gear 341 rotates in the forward direction as the first sub-rotation shaft 320 rotates according to the rotation of the first body 3, the first sub-driven gear 345 moves in the reverse direction. The second sub-driven gear 346 rotates in the forward direction.

Therefore, since the second sub-drive gear 342 is meshed with the second sub-driven gear 346, the second sub-rotation shaft 330 rotates in the reverse direction opposite to the rotation direction of the first sub-rotation shaft 320. do.

On the other hand, the sub-hinge module 301 according to the present embodiment is one end of the first and second sub-rotation shaft (320, 330) and the first and second sub-driven gear 345 in the second hinge case (310) And first and second sub-holders 410 and 420 rotatably supporting 346.

In addition, the sub hinge module 301 supports a third sub holder 430 rotatably supporting the other end portions of the first and second sub rotation shafts 320 and 330 inside the second hinge case 310. It includes more.

In the above, the first and second sub holders 410 and 420 are installed to be fixed to the second hinge case 310 with the first and second sub driven gears 345 and 346 interposed therebetween.

That is, the first sub holder 410 is fixed to the second hinge case 310 through the bolt (B), the first and second sub-rotation shaft (320, 330) can be rotatably fitted A pair of third mounting holes 411 are formed.

The second sub holder 420 is fixedly installed on the fixing protrusion 421 formed in the second hinge case 310, and has a pair of first and second sub driving gears 341 and 342 through which the second sub holder 420 may pass. The fourth mounting hole 423 is formed.

Here, the second sub holder 420 forms a fixing groove (not shown) in which the fixing protrusion 421 of the second hinge case 310 may be fitted.

In addition, each of the first and second sub holders 410 and 420 is provided with a pair of second mounting grooves 418 rotatably supporting the first and second sub-driven gears 345 and 346. .

In addition, the third sub holder 430 is fixed to the second hinge case 310 through a bolt B, and the first and second sub rotation shafts 320 may be formed inside the second hinge case 310. A fifth mounting hole 431 to which the other end of the 330 is rotatably fitted is formed.

In this case, the third sub holder 430 forms a movement path 314 through which the flexible printed circuit 390 mentioned above can pass.

In this case, the third sub holder 430 is integrally formed with the first portion 433 and the first portion 433 in which the other end portions of the first and second sub rotation shafts 320 and 330 are rotatably fitted. The second portion 435 is formed to form a moving path 314 and is fixed to the second hinge case 310 through the bolt B.

A pair of fifth mounting holes 431 are formed in the first portion 433, and the second portion 435 extends in a vertical direction from one side edge of the first portion 433 and the first portion 433. Is bent in the width direction.

Here, the second portion 435 is formed with a coupling hole 437 into which the coupling protrusion 436 provided in the second hinge case 310 can be fitted, and a fastening hole for fastening the bolt B ( Not shown) is formed.

In the present embodiment, the sub cam unit 350 includes a sub rotary cam 351 and a sub moving cam 355.

The sub rotary cam 351 is formed integrally with the first and second sub drive gears 341 and 342, respectively.

Here, as mentioned above, each sub-rotation cam 351 may implement free-stop opening free of rotation of the first and second bodies 3 and 5 in the open range of 0 to 360 degrees. The cam diagram is configured to be kept constant from the beginning to the end.

In addition, the sub-movement cam 355 is installed on the first and second sub-rotation shafts 320 and 330 to be linearly moved along the axial direction.

The sub-moving cam 355 has a pair of insertion holes 355a into which the first and second sub-rotation shafts 320 and 330 can be fitted, and each sub-rotation cam 351 is in contact with each other. The third and fourth cam portions 356 and 357 are integrally formed.

That is, the sub moving cam 355 has the first and second sub rotating shafts 320 and 330 fitted into the insertion holes 355a and moves linearly along the axial direction of the rotating shafts 320 and 330.

In this case, the third and fourth cam portions 356 and 357 may have a cam diagram from the beginning to the end so as to realize free-stop opening free of rotation of the first and second bodies 3 and 5. Configure to remain constant.

In the above, the reason why the sub-rotation cam 351 is formed integrally with the first and second sub-drive gears 341 and 342 is that the first and second bodies 3 and 5 are free-stopped. Unlike the main hinge module 101 which generates a relatively large torque for the operation, the sub-hinge module 301 does not require a large torque and simply supports the hinge operation of the main hinge module 101. This is because the durability of the first and second sub-rotation shafts 320 and 330 is not deteriorated.

On the other hand, the sub-elastic member 360 is to exert a force to the sub-movement cam 355 so that the sub-movement cam 355 is in close contact with the sub-rotation cam 351 so that they can come in contact with each other.

The sub elastic member 360 is formed as a wave spring 361 mounted to the first and second sub-rotation shafts 320 and 330, respectively, and the wave spring 361 is formed as a leaf spring bent in a round shape.

The wave spring 361 is disposed between the sub-movement cam 355 and the third sub holder 430 and mounted to the first and second sub-rotation shafts 320 and 330. A pair of shaft holes 363 to which the first and second sub-rotation shafts 320 and 330 are fitted may be formed.

Hereinafter, the operation of the hinge apparatus 100 for a portable terminal according to an exemplary embodiment of the present invention configured as described above will be described in detail with reference to the drawings and the following drawings.

First, in this embodiment, the close mode in which the first body 3 and the second body 5 of the portable terminal 1 face each other at 0 degrees is set as the initial starting point.

In the close mode, the main rotating cam 151 and the sub rotating cam 351 are cams of the main moving cam 155 and the sub moving cam 355 as elastic forces of the main elastic member 160 and the sub elastic member 360. It is in close contact with the slope section on the profile.

Thus, the main rotary cam 151 and the sub rotary cam 351 is a rotational force acts in the direction in which the inclined section of the main mobile cam 155 and the sub mobile cam 355.

Thus, in the close mode, the rotational force acts in the closing direction of the first body 3 on the first main rotation shaft 120 and the first sub rotation shaft 320 through the main rotation cam 151 and the sub rotation cam 351. As a result, the first body 3 provides a preload of a predetermined torque with respect to the second body 5 as its rotational force.

This means that when the first body 3 and the second body 5 are closed at 0 degrees, even if the position of the portable terminal 1 is changed, the first body 3 is connected to the second body 5 through the preload. Since it is possible to prevent a phenomenon such as being caused by its own weight, it is possible to further maximize the merchandise of the portable terminal (1).

In the close mode as described above, when the first body 3 is rotated for a predetermined period, the first main rotation shaft 120 and the first sub rotation shaft 320 are connected through the first frame 103 and the frame ( Since 103 is fixed to the first body 3, it rotates in the forward direction as shown in FIG.

Accordingly, the first main drive gear 141 and the first sub drive gear 341 rotate in the forward direction, and the first main driven gear 145 and the first sub driven gear 345 rotate in the reverse direction. The second main driven gear 146 and the second sub-driven gear 346 rotate in the forward direction.

Accordingly, the second main drive gear 142 and the second sub drive gear 342 may include the second main driven gear 146 and the second sub driven gear. Since it is engaged with 346, the first main rotary shaft 120 and the first sub rotary shaft 320 are rotated in the reverse direction opposite to the rotation direction.

That is, when the first body 3 is opened for a predetermined period while the first and second bodies 3 and 5 of the portable terminal 1 are closed at 0 degrees, the first main rotation shaft 120 and the first main shaft 120 are opened. As the sub rotating shaft 320 rotates in the forward direction, the second main rotating shaft 130 and the second sub rotating shaft 330 rotate in the reverse direction through the interaction of the gears as described above.

As a result, the first body 3 is rotated in the forward direction through the first main rotation shaft 120 and the first sub rotation shaft 320 through the above-described action, and the second body 5 is rotated in the second direction. Since the main rotation shaft 130 and the second sub-rotation shaft 330 rotate in the reverse direction, the first body 3 may be opened in a range of 0 to 360 degrees with respect to the second body 5.

During the above process, the sub rotary cam 351 and the sub moving cam 355 of the main rotating cam 151 and the main moving cam 155 of the main hinge module 101 and the sub hinge module 301 are first displayed. Since the cam diagram is configured to be kept constant from the end to the end, the cams come into contact with the cam as relatively large torques while the first body 3 rotates from 0 to 360 degrees.

Therefore, in the present embodiment, it is possible to implement free-stop opening in which rotation of the first body 3 is free in the rotation range of 0 to 360 degrees.

Meanwhile, when the first and second bodies 3 and 5 are completely opened at 360 degrees as described above, when the bodies 3 and 5 are closed at 0 degrees, the operation is performed in the reverse order to the above process. More detailed description will be omitted.

As described above, the hinge device 100 for a portable terminal according to an exemplary embodiment of the present invention may be configured to display the first body 3 in a state where the first and second bodies 3 and 5 face 0 degrees. Since the free-stop opening can be implemented to rotate 360 degrees with respect to the body 5 and stop at an arbitrary angle, convenience of use can be improved.

In addition, in the present embodiment, in addition to the main hinge module 101 for generating the drive torque for implementing the pre-stop operation, the main hinge module 101 is provided with a sub-hinge module 301 that is separated, interconnected, and interlocked with the main hinge module 101. In addition, the hinge of the main hinge module 101 may be supported through the sub-hinge module 301, and the gap between the second body 5 and the second body 5 may be suppressed when the first body 3 is opened.

In addition, in the present embodiment, when the distance between the axes of the first and second hinge shafts 105 and 305 is determined to be the same, the first and second hinge shafts 105 and 305 are driven gears 141, 142 and 341. , 342 and the driven gears 145, 146, 345, and 346 are connected to each other, so that, unlike the prior art, the size of the driving gear can be reduced, and the size and thickness of the entire hinge device 100 can be reduced. The structural stability of the mobile terminal can be improved.

In this embodiment, since the fourth through part 312 of the second hinge case 310 is formed as a dummy part supporting the relative rotation of the first and second bodies 3 and 5, the dummy part may be separately assembled. Since there is no need, the assembly process and components can be simplified.

Furthermore, since the fourth through portion 312 as the dummy portion can absorb the impact of opening and closing the first and second bodies 3 and 5, the first and second hinge shafts 105 and 305 are impacted. Can be prevented from being deformed or damaged by the driving gears 141, 142, 341, 342 and driven gears 145, 146, 345, 346.

Therefore, in this embodiment, it is possible to solve the problem of the operability of the hinge device 100 due to the deformation of the first and second hinge shafts 105 and 305 and the damage of the gears.

In addition, in the present exemplary embodiment, since the movement path 314 of the flexible printed circuit 390 is formed inside the second hinge case 310 through the third sub holder 430, the flexible printed circuit 390 The advantage is easy mounting and wiring.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications and changes can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings. Naturally, it belongs to the scope of the invention.

Claims (20)

A hinge device for a portable terminal for rotating the first body of the portable terminal as a preset rotation range with respect to the second body, A main hinge module and a sub-hinge module each separated from each other and configured to be connected to the first and second bodies, The main hinge module and the sub hinge module, A second hinge connected to a first frame fixed to the first body to form a first hinge axis of the first body, and connected to a second frame fixed to the second body and parallel to the first hinge axis Forming the hinge axis, A gear unit and a cam unit are configured on the coaxial axis of each of the first and second hinge shafts to implement free-stop opening free of rotation of the first and second bodies in an open range of 0 to 360 degrees. Hinge device for mobile terminal. According to claim 1, The main hinge module, A first hinge case rotatably connected to the first and second bodies, A first main rotating shaft rotatably mounted to the first hinge case on a coaxial axis of the first hinge shaft; A second main rotary shaft rotatably mounted to the first hinge case on a coaxial axis of the second hinge shaft in parallel with the first main rotary shaft, Comprising the main gear unit and the main cam unit on the first and second main rotary shaft, A hinge device for a portable terminal comprising a main elastic member exerting a crushing force on the main cam unit on the first and second main rotary shafts. The method of claim 2, The sub hinge module, A second hinge case rotatably connected to the first and second bodies separately from the first hinge case; A first sub-rotation shaft rotatably mounted to the second hinge case on the coaxial axis of the first hinge shaft and connected to the first main rotation shaft through the first frame; A second sub rotating shaft rotatably mounted to the second hinge case on a coaxial axis of the second hinge shaft in parallel with the first sub rotating shaft, and connected to the second main rotating shaft through the second frame; Configuring a sub gear unit and a sub cam unit on the first and second sub rotating shafts; A hinge device for a portable terminal comprising attaching a sub-elastic member exerting a bullet force to the sub cam unit to the first and second sub-rotation shafts. The method of claim 3, wherein The second hinge case, And a moving path through which a flexible printed circuit electrically connected to the circuit devices of the first and second bodies is formed. The method of claim 3, wherein The first main rotational shaft and the first sub-rotational shaft are connected through the first frame to form the first hinge shaft; And the second main rotating shaft and the second sub rotating shaft are connected through the second frame to form the second hinge shaft. The method of claim 2, The main gear unit, First and second main drive gears fixed to the first and second main rotation shafts, respectively; A first main driven gear rotatably installed in the first hinge case and meshing with the first main drive gear; A second main driven gear rotatably installed in the first hinge case and meshing with the first main driven gear and the second main driving gear; Hinge device for a mobile terminal comprising a. The method of claim 3, wherein The sub gear unit, First and second sub-drive gears fixedly installed on the first and second sub-rotation shafts, respectively; A first sub-driven gear rotatably installed in the second hinge case and meshing with the first sub-drive gear; A second sub-driven gear rotatably installed in the second hinge case and meshing with the first sub-driven gear and the second sub-drive gear; Hinge device for a mobile terminal comprising a. The method of claim 6, The main cam unit, A main rotary cam rotatably mounted to the first and second main rotation shafts separately from the first and second main drive gears, and coupled to the first and second main drive gears, respectively; A main moving cam installed on the first and second main rotary shafts so as to be linearly movable along the axial direction and in contact with each of the main rotary cams; Hinge device for a mobile terminal comprising a. The method of claim 8, Each of the first and second main drive gears is insert injection molded to the first and second main rotary shafts, respectively, and a pair of engaging protrusions that can be coupled to each of the main rotary cams is integrally formed. Each of the main rotary cam is a hinge device for a mobile terminal is formed a pair of coupling grooves to which the coupling projection is fitted. The method of claim 8, The main mobile cam, A hinge device for a portable terminal, comprising first and second cam portions in cam contact with each of the main rotary cams, wherein the first and second cam portions are integrally formed. The method of claim 7, wherein The sub cam unit, A sub rotary cam formed integrally with the first and second sub drive gears, respectively; Sub-moving cams installed on the first and second sub-rotation shafts so as to be linearly movable along the axial direction and cam-contacting each of the sub-rotation cams. Hinge device for a mobile terminal comprising a. The method of claim 11, wherein And each of the first and second sub-drive gears and each of the sub-rotary cams is insert injection molded to each of the first and second sub-rotation shafts. The method of claim 11, wherein The sub mobile cam, And a third and a fourth cam portion in cam contact with each of the sub-rotary cams, wherein the third and fourth cam portions are integrally formed. The method of claim 2, The main hinge module, A first shaft fixedly mounted to the first hinge case with the first and second main driven gears interposed therebetween to rotatably support the first and second main rotary shafts and the first and second main driven gears; A hinge device for a portable terminal further comprising a first and a second main holder. The method of claim 14, The first main holder is fixed to the first hinge case through a bolt, a pair of first mounting holes are formed to be rotatably fitted to each of the first and second main rotation shaft, The second main holder is fixedly installed on a fixing protrusion formed in the first hinge case, and a pair of second mounting holes through which the first and second main driving gears pass, is formed. And each of the first and second main holders is provided with a pair of first mounting grooves rotatably supporting the first and second main driven gears. The method of claim 3, wherein The sub hinge module, It is fixed to the second hinge case with the first and second sub-driven gears interposed therebetween to enable rotation of one end of each of the first and second sub-rotation shafts and the first and second sub-driven gears. Supporting first and second sub holders, And a third sub holder fixed to the second hinge case and rotatably supporting the other end of each of the first and second sub-rotation shafts. The method of claim 16, The first sub holder is fixed to the second hinge case through a bolt, and a pair of third mounting holes are formed in which one end of each of the first and second sub rotating shafts can be rotatably fitted. , The second sub holder is fixedly installed on a fixing protrusion formed in the second hinge case, and a pair of fourth mounting holes through which the first and second sub driving gears pass, is formed. The third sub holder is fixedly installed to the second hinge case through a bolt, and a fifth mounting hole is formed in which the other one end of each of the first and second sub rotating shafts can be rotatably fitted. And each of the first and second sub holders has a pair of second mounting grooves rotatably supporting the first and second sub-driven gears. The method of claim 16, The third sub holder, And a moving path through which a flexible printed circuit electrically connected to the circuit devices of the first and second bodies is passed. The method of claim 2, The main elastic member, A hinge device for a portable terminal, comprising a compression coil spring mounted to the first and second main rotary shafts, respectively. The method of claim 3, wherein The sub elastic member, A hinge device for a portable terminal, comprising a wave spring having a pair of shaft holes into which the first and second sub-rotation shafts can be fitted.

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