JP2003003731A - Door opening and closing mechanism - Google Patents

Abstract

(57) [Summary] [Problem] While improving the usability,
Provided is a door opening / closing mechanism capable of reducing cost, improving reliability, and improving mass productivity. SOLUTION: In a door opening / closing mechanism for opening / closing doors 2 and 3 covering both sides of a middle part of an opening 1a of a device main body with both ends of the opening 1a as axes sides, a first engagement mechanism is provided when the door 2 is closed. A second locking position by sliding the door 2 from the open side to the axial side when the door 2 is opened, and a cam mechanism for pivotally supporting the door 2 at the second locking position. Are positioned at the first and second locking positions, and the hinge portions 9 and 23 that guide from the first locking position to the second locking position and pivotally support at the second locking position are arranged on the shaft side of the door 2. The guides 51 and 52 for guiding the door 2 from the first locking position to the second locking position and for guiding the door 2 rotating at the second locking position are disposed on the open side of the door 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a door opening / closing mechanism which opens and closes on both sides of a refrigerator such as a storage compartment of a refrigerator.

[0002]

2. Description of the Related Art In a conventional double-door door opening / closing mechanism, a partition plate is provided at the center of an opening of a storage room of a refrigerator, etc., and the left and right doors come into contact with the partition plate to close the opening. ing. Since this partition plate is an obstacle when working through the opening, there is a gap between the left and right doors when it is removed. Since a refrigerator or the like needs to be hermetically sealed, the gap between both doors is closed by packing or the like.

However, if a packing or the like is provided, when one of the doors is opened, the packing attached to the door slides on the packing attached to the other door. Therefore, there is a problem that a large operating force is required when opening and closing the door due to the frictional force caused by sliding and a problem that the packing is damaged. Further, even if no packing or the like is provided, if the gap between both doors is narrowed to prevent dust from entering, there is a problem that the end surface of one door interferes with the other door when it rotates. .

To solve this problem, Japanese Patent Publication No. 60-
Japanese Patent No. 24390 discloses a door opening / closing mechanism that slides in a substantially straight line in a direction away from the other door before one door rotates. In this door opening / closing mechanism, a first rotating shaft is provided in a receiving portion projecting forward from a housing forming the outer wall of the opening.

A lever member is mounted on the receiving portion, and the first member
A hole formed at one end of the lever member is fitted to the rotating shaft. A second rotating shaft is integrally formed at the other end of the lever member, and the door is pivotally supported by the second rotating shaft. Further, a guide member is provided so that the lever member rotates about the first rotation axis when the door is opened, and a spring for urging the lever member in the returning direction is provided.

When one of the doors is opened, the lever member is rotated by being guided by the guide member, and the door slides in a substantially straight line by a predetermined amount as the lever member rotates. This causes the door to separate from the other door. After that, when the door is separated from the opening and the engagement of the guide member is released, the lever member returns to the original state by the biasing force of the spring. Then, the door is rotated about the second rotation axis to open the opening.

When the door is closed, the door rotates about the second rotation shaft to the vicinity of the housing. Thereafter, the guide member starts to engage against the biasing force of the spring, the lever member rotates about the first rotation shaft, and the door slides in the direction away from the other door. Then, in response to the door being closed by being guided by the guide member, the lever member returns to its original position by the biasing force of the spring, and the door is closed.

[0008]

However, according to the door opening / closing mechanism disclosed in Japanese Patent Publication No. 60-24390, the lever member slides on the receiving portion, so that a frictional force depending on the weight of the door is generated. Join. Therefore, it is necessary to make the biasing force of the spring larger than the frictional force. As a result, when the door is opened, a large operating force against the frictional force of the lever member and the biasing force of the spring is required, which causes a problem of poor operability.

Further, since a lever member and a spring are required, the number of parts is large and the number of assembling steps is increased. For this reason, there are problems that the cost of the door opening / closing mechanism is increased and the reliability is lowered, and that the mass productivity is lowered to maintain the reliability.

It is an object of the present invention to provide a door opening / closing mechanism which can improve operability, reduce cost, improve reliability and improve mass productivity.

[0011]

In order to achieve the above object, the present invention provides a door opening / closing means for opening and closing a door covering both sides of an opening of a main body of a device with both ends of the opening as axis sides. In the mechanism, when the door is closed, the first locking position is set, and when the door is opened, the door is slid from the open side to the shaft side to take the second locking position, and the second locking position is set at the second locking position. It is characterized in that the cam mechanism for pivotally supporting the door is arranged separately on the shaft side and the opening side of the door.

According to this structure, the cam mechanism arranged separately on the shaft side and the opening side of the door takes the first locking position when the door is closed. When the door is opened, the cam mechanism moves from the first locking position to the second locking position, and accordingly, the door is guided by the cam mechanism to perform sliding movement and rotation movement from the opening side to the shaft side. When the cam mechanism reaches the second locking position, the position of the pivot shaft of the door is fixed, the door pivots about the pivot shaft, and the opening is opened.

Further, the present invention is characterized in that, in the door opening / closing mechanism having the above structure, the cam mechanism is provided with a positioning portion for positioning the door at the first locking position on the opening side of the door. With this configuration, when the door is closed, the door is positioned by the positioning portion arranged on the opening side of the door, and the cam mechanism takes the first locking position.

According to the present invention, in the door opening / closing mechanism having the above-mentioned structure, the cam mechanism positions the door at the first and second locking positions and guides the door from the first locking position to the second locking position. And a hinge part pivotally supported at a second locking position on the shaft side of the door to guide the door from the first locking position to the second locking position and rotate at the second locking position. Is provided on the open side of the door.

According to this structure, when the door is closed, the hinge is arranged on the shaft side of the door to position the door, and the cam mechanism takes the first locking position. When the door is opened, the door is slid by the guide portion arranged on the shaft side of the door and the guide of the hinge portion, and the cam mechanism takes the second locking position by the positioning of the hinge portion. The hinge portion supports the rotation shaft at the second locking position, and the door is rotated and opened while being guided by the guide portion.

Further, according to the present invention, in the door opening / closing mechanism having the above-mentioned structure, the cam mechanism is provided with an auxiliary guide portion for guiding the door which rotates at the second locking position on an axial side of the door. I am trying. According to this configuration, when the door is opened, the guide is guided to slide the door from the first locking position to the second locking position while rotating, and guides the guide portion and the auxiliary guide portion at the second locking position. Opens the door by rotating.

In the door opening / closing mechanism having the above-mentioned structure according to the present invention, the cam mechanism includes a hinge pin serving as a rotation axis of the door when the door is opened, a guide pin arranged on an opening side of the door, and A hinge groove in which the cam mechanism takes first and second locking positions by guiding the hinge pin and locking at both ends, and a guide for guiding the guide pin from the first locking position to the second locking position. It is characterized by including a groove, a rib arranged along an arc coaxial with the hinge pin, and a boss having a cylindrical surface that is in sliding contact with the rib at the second locking position.

According to this structure, for example, the hinge pin is projected at one end on the main body side, and the guide pin is projected parallel to the hinge pin on the main body side facing the opening side of the door. The door is provided with an elongated hole-shaped hinge groove that is loosely fitted to the hinge pin and a guide groove that is loosely fitted to the guide pin. When the door is closed, the hinge pin is locked at one end of the hinge groove and the guide pin is locked at one end of the guide groove, so that the cam mechanism takes the first locking position. When the door starts to open, the hinge pin is guided in the hinge groove. At this time, the guide pin and the guide groove are engaged with each other to prevent the door from rotating, and the guide pin is guided by the guide groove to slide the door while rotating. As a result, the hinge pin is locked to the other end of the hinge groove, and the cam mechanism takes the second locking position. Further, a rib having a cylindrical concave surface, which is concentric with the hinge pin, is projectingly provided on the body side, and the rib and the second
A boss having a cylindrical surface that slides in the locked position is provided on the door side. When the door is further opened, the peripheral surface of the boss slidably contacts the concave surface of the rib and the hinge pin is fixed to the other end of the hinge groove.
The door rotates about the hinge pin as a rotation axis at the locking position. At this time, the guide pin is provided with an escape portion, for example, in a guide groove so as to escape in a direction that does not hinder the rotation of the door. In each combination of the hinge pin and the hinge groove, the guide pin and the guide groove, and the rib and the boss, they may be provided on any one of the main body side and the door side and on the other side.

Further, according to the present invention, in the door opening / closing mechanism having the above-mentioned structure, an arcuate portion which is recessed in a circumferential direction centered on the hinge pin at the first locking position is extended to an end portion of the guide groove. Is characterized by. According to this structure, when the hinge pin reaches the first locking position, the guide pin is guided by the arc portion and moves relatively even when the guide pin does not reach one end of the guide groove due to a dimensional error of the cam mechanism. Then, the open side of the door is further rotated to the main body side to securely close the door.

According to the present invention, in the door opening / closing mechanism having the above structure, the relative movement direction of the guide groove is larger than the movement amount of the guide pin that relatively moves from the first locking position to the second locking position. It is characterized by the increased length. With this configuration, even if the cam mechanism has a dimensional error, the guide pin can reach the first locking position, and the doors and the door and the body are reliably closed.

According to the present invention, in the door opening / closing mechanism having the above structure, the length of the hinge groove in the relative movement direction is longer than the movement amount of the hinge pin that relatively moves from the first locking position to the second locking position. The feature is that it is longer. According to this configuration, the hinge pin can reach the first locking position even if there is a dimensional error in the cam mechanism, and the two doors and the door and the main body are reliably closed.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a top sectional view showing a door opening / closing mechanism of an embodiment. An opening 1a having an outer wall is formed in a housing 1 on the body side of a refrigerator or the like. The opening 1a is covered with the left door 2 on the left side and with the right door 3 on the right side at the middle point. The left door 2 and the right door 3 are provided at one end with handles 4 and 5 which are held by the user.

The other ends of the left door 2 and the right door 3 are pivotally supported by rotary shafts 1b and 1c which slide relative to the left door 2 and the right door 3 by a cam mechanism, as will be described later, and a handle 4 is provided. 5,
It is designed to grip and open on both sides. Also, left door 2
Packings 6 and 7 are attached to the gaps between the right door 3 and the right door 3, respectively. Magnets (not shown) in packings 6 and 7
Are embedded and are sucked together to seal the gap.

The left door 2 and the right door 3 are provided with door plates 49 and 50 for covering the front surface and a door back 47 provided on the rear surface side.
48 and the door caps 55 and 56 (see FIG. 3) arranged vertically and the side plate (not shown) arranged on the side surface to close the periphery. Then, after injecting a urethane foaming agent into the inside, it is heated to fill the urethane foaming resin. As a result, the inside of the main body is insulated and isolated.

2 and 3 are a top view and a rear view showing the main parts of the left door 2 and the right door 3, respectively. The packing 41, 4 is provided on one side, the upper side and the other side of the door back 47, respectively.
2, 43 are attached. Packing 41, 42, 43
Have both ends cut diagonally and are heat-welded together to be integrated. Although not shown, a packing is also attached below the door back 47, and the packings 41, 42, 43 are turned upside down.

Similarly, packings 44, 45, 46 (44 see FIG. 1) and a lower packing (not shown) are integrally mounted around the door back 48. When the left door 2 and the right door 3 are closed, the door backs 47 and 48 are opened.
The packings 41 to 46 come into contact with the housing 1 (see FIG. 1) by penetrating inside a (see FIG. 1). Flexible magnets (not shown) are embedded in the packings 41 to 46 so that the housing 1 on the main body side is attracted and the sealed state between the left door 2 and the right door 3 and the housing 1 is maintained. Has become.

The cam mechanism includes an upper part of the left door 2, a lower part of the left door 2,
The same structure is provided at four locations on the upper portion of the right door 3 and the lower portion of the right door 3. FIG. 4 is a front cross-sectional view showing a part of the cam mechanism arranged under the left door 2. The cam mechanism includes members provided on the left door 2 and the housing 1. The left door 2 has a slide cam member 8 arranged on the shaft side and a guide cam 53 arranged on the open side (see FIG. 5). ) And are attached. The housing 1 includes a lock cam assembly 32 that engages with the slide cam member 8,
Guide pin 51 that engages with the guide cam 53 (see FIG. 5)
And are installed.

The slide cam member 8 is made of a resin molded product, and bosses 8a and 8b are projectingly provided on the upper surface thereof, and screw holes 8c and 8d penetrating therethrough are formed. The bosses 8a and 8b are fitted into boss holes (not shown) provided on the lower surface of the left door 2, and tapping screws (not shown) are inserted into the screw holes 8c and 8d from the bottom in the figure to slide cam member 8 Is attached to the lower surface of the left door 2. Further, the slide cam member 8 is formed with a boss hole 8f for positioning a lock member 16 described later.

The lock cam assembly 32 includes the lock cam member 18
The angle 22 and the angle 22 are integrated by a screw 31, and engage with the slide cam member 8 to form a part of the cam mechanism. The lock cam member 18 is made of a resin molded product and has an angle 22.
Is made of a metal member for supporting the weight of the left door 2.

The angle 22 has three screw holes 22a formed therein. The angle 22, that is, the lock cam assembly 32 is attached to the housing 1 by inserting a tapping screw into the screw hole 22a. A hinge pin 23, a lock pin 24, and an auxiliary guide pin 25, which are made of metal such as stainless steel, are swaged to be integrated with the angle 22. The hinge pin 23, the lock pin 24, and the auxiliary guide pin 25 respectively penetrate the lock cam member 18 and project upward in the drawing.

A pedestal portion 23a is concentrically formed on the bottom of the hinge pin 23. The bottom surface 10b of the boss 10 projecting from the slide cam member 8 has a pedestal portion 23 when the left door 2 is closed.
It is on a. The boss 10 is formed with a step portion 10c that protrudes downward with respect to the bottom surface 10b. The inner peripheral side of the step portion 10c is formed along the pedestal portion 23a, and is chamfered in contact with the peripheral portion of the pedestal portion 23a.

A plan view of the cam mechanism is shown in FIG. The figure shows a state in which the left door 2 is closed, and members attached to the housing 1 side are shaded. A lock member 16 is attached to the slide cam member 8. The lock member 16 is made of a resin molded product, and a boss (not shown) provided on the upper surface is fitted into a boss hole 8f (see FIG. 4) provided on the lower surface of the slide cam member 8, and a tapping screw (not shown). )
Etc. are attached.

An arm portion 16a is provided at one end of the lock member 16.
Has been extended. The arm portion 16a is elastically deformable with respect to a load in a direction substantially perpendicular to the extending direction. An engaging portion 16b that engages with the lock pin 24 is provided at the end of the arm portion 16a. At the other end of the lock member 16, there is provided a restriction portion 16c that abuts a stopper 18e formed on the lock cam member 18 (see FIG. 4) and restricts the rotation of the left door 2.

On the lower surface of one end of the slide cam member 8, a long hole-shaped hinge groove 9 is recessed. Around the hinge groove 9, a boss 10 having a cylindrical surface 10a centering on the hinge pin 23 at the second locking position described later is provided in a protruding manner.

Lock cam member 1 around the hinge pin 23
A rib 19 having a cylindrical concave surface 19a that is concentric with the hinge pin 23 is provided on the projection 8. An auxiliary guide groove 11 that is bent in an L shape is recessed on the center side of the opening 1a (see FIG. 1) with respect to the hinge groove 9. The auxiliary guide groove 11 has a guide portion 11a that relatively guides the auxiliary guide pin 25 from a first locking position to a second locking position, which will be described later, and a relief that relatively releases the auxiliary guide pin 25 at the second locking position. Part 11
b.

The guide cam 53 attached to the open side of the left door 2 is made of a resin molded product and has a bent guide groove 52. A guide pin 51 made of, for example, stainless steel, which engages with the guide groove 52, is attached to the housing 1 while being supported by an angle (not shown).

The guide groove 52 has a guide portion 52a that relatively guides the guide pin 51 from a first locking position to a second locking position, which will be described later, and a clearance that allows the guide pin 51 to relatively escape at the second locking position. First from the portion 52b and the end of the guide portion 52a.
It has a circular arc portion 52c extending in a circumferential direction with the hinge pin 23 at the locking position as the center.

Next, the operation of the cam mechanism under the left door 2 will be described with reference to FIGS. Similar operations are performed for the other cam mechanisms. Incidentally, in these drawings, each part of the cam mechanism should be originally represented by a broken line, but is shown by a solid line for convenience. Further, the shaded portion indicates the member arranged on the housing 1 side as described above.

As described above, FIG. 5 shows the state in which the left door 2 is closed. In the closed state of the left door 2, the hinge pin 23 is locked to one end of the hinge groove 9, and the cam mechanism is in the first locking position. In the first locking position, the guide pin 51 is arranged at the end of the guide portion 52a of the guide groove 52. Also,
The auxiliary guide pin 25 is a guide portion 11a of the auxiliary guide groove 11.
It is located at the end of.

Since the circular arc portion 52c of the guide groove is formed on the circular arc centered on the hinge pin 23 at the first locking position, the left door 2 is closed in the first locking position with the hinge pin 23 as a pivot. It can be rotated to. Therefore, the first
It is possible to reliably close the left door 2 at the locked position. At this time, the guide portion 11a of the auxiliary guide groove 11 and the auxiliary guide pin 25 do not come into contact with each other so as to prevent the rotation of the left door 2 from being regulated. There are gaps A1 and A2 in the longitudinal and width directions of the groove.

The lock pin 24 engages with the engaging portion 16b of the lock member 16, and the elastic force of the arm portion 16a causes the left door 2 to move.
Is urged toward the right door 3 (see FIG. 1). As a result, a predetermined amount of clearance between the left door 2 and the right door 3 is reliably maintained, and the left door 2 is prevented from moving due to the clearance for fitting between the hinge pin 23 and the hinge groove 9. . Therefore, the cam mechanism holds the state of the first locking position, and more securely ensures the closed and closed state of the left door 2.

When the left door 2 starts to open by gripping the handle 4 (see FIG. 1), the left door 2 rotates with opening, but the guide portion 52a of the guide groove 52 engages with the guide pin 51. ,
In the first locking position, the hinge pin 23 cannot rotate about the axis. Therefore, the hinge pin 23 is guided relatively to the hinge groove 9 and the guide pin 51 is guided to the guide portion 52a. Further, the relative movement of the auxiliary guide pin 25 is not restricted by the gap A2 provided in the guide portion 11a of the auxiliary guide groove 11.

As a result, the left door 2 rotates and the right door 3 rotates.
Slide away from (to the left in the figure).
Therefore, the packing 6 provided on the left door 2 is separated from the packing 7 provided on the right door 3, avoiding the sliding of the packings 6 and 7 to prevent damage, and reducing the sliding friction reduces the operating force for opening. Is reduced.

At this time, the step portion 10a (see FIG. 4) of the boss 10 rides on the pedestal portion 23a (see FIG. 4) and the left door 2 is lifted. Therefore, the left door 2 can be opened only when the operation force for pulling the handle 4 is exerted, and the packings 41 to 4 can be opened.
The elastic force of 3 prevents the left door 2 from being easily opened from the closed state.

Further, the arm portion 16a of the lock member 16 is elastically deformed and the disengagement of the lock pin 24 and the engagement portion 16b is started. At this time, when the grip 4 is released, the arm 1
The left door 2 returns to the state of FIG. 5 by the elastic force of 6a. Therefore, the lock member 16 and the lock pin 24 have a self-closing function, and the left door 2 can be surely closed.

When the left door 2 rotates and slides, the hinge pin 23 is locked to the other end of the hinge groove 9 as shown in FIG. 6, and the cam mechanism takes the second locking position. Further, the cylindrical surface 10a of the boss 10 starts sliding along the concave surface 19a of the rib 19.

At this time, the guide pin 51 and the auxiliary guide pin 25 are arranged at the intersecting positions of the guide portions 52a, 11a and the escape portions 52b, 11b of the guide groove 52 and the auxiliary guide groove 11, respectively. The guide groove 52 and the relief portions 52b and 11b of the auxiliary guide groove 11 are the hinge pins 23 at the second locking position.
The guide pin 51 and the auxiliary guide pin 25 are relatively released while guiding the rotation of the left door 2 to securely hold the second locking position.

When the left door 2 is further opened, as shown in FIG.
The cylindrical surface 10a of the boss 10 slides at two points on the concave surface 19a of the rib 19, and the boss 10 cannot move in the longitudinal direction of the hinge groove 9. As a result, the cam mechanism holds the state of the second locking position, and the left door 2 is pivotally supported. Concave surface 19 of rib 19
As long as a can guide the boss 10, it may be formed by a plurality of pins or the like arranged on an arc concentric with the hinge pin 23 instead of the rib 19.

Further, the left door 2 rotates while the guide groove 52 relatively guides the guide pin 51 and the cam mechanism holds the second locking position. In the guide portion 11a of the auxiliary guide groove 11, the gaps A1 and A2 (see FIG.
(Refer to FIG. 4), the relief portion 5 of the guide groove 52 is provided.
The engagement between the escape portion 11b of the auxiliary guide groove 11 and the auxiliary guide pin 25 is started after the engagement between 2b and the guide pin 51.

When the left door 2 is further opened, as shown in FIG.
The engagement between the guide groove 52 and the guide pin 51 is released.
After that, in the cam mechanism, the auxiliary guide groove 11 relatively guides the auxiliary guide pin 25 to hold the second locking position, and the left door 2 rotates. In addition, the lock pin 24 and the lock member 16
Is disengaged.

Here, the guide cam 53 and the guide pin 25
The distance between the guide pin 51 and the auxiliary guide pin 25 and the distance between the escape portions 11b and 51b at the corresponding positions may not match due to the mounting error of the guide cam and the dimensional error of the guide cam. At this time, during a period in which the engagement between the guide groove 52 and the guide pin 51 and the engagement between the auxiliary guide groove 11 and the auxiliary guide pin 25 occur at the same time, for example, due to the error, the guide groove 52 and the guide pin 51 are separated from each other. The sliding friction of becomes large and the left door 2 cannot be opened smoothly.

Therefore, the escape portion 52b and the guide pin 51 are
The clearance between the clearance portion 11b and the auxiliary guide pin 25 is increased while the clearances are engaged with each other, and the clearance portion 11b and the auxiliary guide pin 25 are canceled after the clearance between the clearance portion 52b and the guide pin 51 is released. The gap with the pin 25 is made small. Runaway part 1
By changing the gap between 1b and the auxiliary guide pin 25 to avoid the influence of the mounting error, the left door 2 can be smoothly rotated.

The clearance between the clearance portion 52b and the guide pin 51 before the engagement of the clearance portion 11b and the auxiliary guide pin 25 is reduced to reduce the clearance portion 11b and the auxiliary guide pin 25.
Of the escape portion 52b and the guide pin 51 after the engagement of
The same effect can be obtained even if the gap between and is increased.

When the left door 2 is further opened, the restricting portion 16c of the lock member 16 comes into contact with the stopper 18e formed on the lock cam member 18 (see FIG. 4) to restrict the range of rotation of the left door 2. To be done. In addition, FIG.
The left door 2 can be closed by the operation opposite to that shown in FIG.

According to the present embodiment, when the left door 2 starts to open, the cam mechanism moves from the first locking position to the second locking position and the left door 2 slides while rotating. Door 2
Can be separated from the right door 3 and the sliding of the packings 6, 7 (see FIG. 1) can be avoided. Therefore, since sliding friction of the packings 6 and 7 does not occur, a large force is not required to open and close the left door 2, and the operability of the door opening / closing mechanism can be improved.
Even if the gap between the left door 2 and the right door 3 is narrowed when the packings 6 and 7 are not provided, it is possible to prevent interference between the end portion of the left door 2 and the right door 3 due to the rotation.

Further, since the left door 2 is slid by being guided by the cam mechanism, it is possible to reduce the number of parts without requiring a spring for returning the sliding movement as in the conventional example. Furthermore, since the weight of the door is added to the pivot shaft, the contact area is narrow, sliding friction is small, and a spring with a strong elastic force is not required, so the operating force required to open and close the door can be reduced, further improving operability. can do.

A guide pin 51 and a guide cam 53 for guiding the sliding movement from the first locking position to the second locking position are provided on the open side of the left door 2. An angle θ formed by the longitudinal direction C1 (see FIG. 5) of the guide portion 52a of the guide groove 52 and the direction C2 (see FIG. 5) in which an operating force for pulling the handle 4 is applied.
(See FIG. 5) is smaller than when the guide pin 51 and the guide cam 53 are arranged on the shaft side. Therefore, the sliding friction between the guide pin 51 and the guide groove 52 is reduced, and the operating force for opening and closing the door can be reduced to improve the operability of the door opening / closing mechanism.

Further, the hinge pin 2 provided on the shaft side of the left door 2
3, the hinge groove 9 is locked, and the guide pin 51 and the guide groove 52 provided on the open side are engaged with each other to position the cam mechanism at the first locking position. Guide pin 5
If there is a mounting error of 1 or the guide cam 53 or a dimensional error of the guide cam 53, when the guide pin 51 is arranged at the end of the guide portion 52a, the left door 2 is in a state of being opened more than a predetermined closed position. There are cases.

When the guide pin 25 and the guide cam 53 are provided on the shaft side, the left door 2 opens at that position by the amount of the error, but the opening amount of the left door 2 is increased on the open side. But,
Since the guide pin 51 and the guide cam 53 are provided on the opening side of the left door 2, the opening amount on the opening side is substantially equal to the error, and is smaller than when it is provided on the shaft side. Therefore, due to the error, the packing 41 is opened by the amount of opening beyond the predetermined closed position.
It is possible to absorb by ~ 43, it is possible to reliably maintain the sealed state.

At this time, as described above, by providing the guide groove 52 with the arc portion 52c (see FIG. 5), the left door 2 is further rotated in the closing direction at the first locking position even if there is such an error. Therefore, the left door 2 can be more reliably sealed.

Further, instead of the arc portion 52c, the guide portion 52a
May be extended in the longitudinal direction C1 of the guide portion 52a. That is, by making the length of the guide portion 52a in the longitudinal direction longer than the moving distance of the guide pin 51 that relatively moves from the first locking position to the second locking position, the guide pin 51 at the first locking position is normally used. Between the guide groove 52 and the guide groove 52.
A gap in the longitudinal direction C1 of a is formed.

As a result, even if there is a mounting error of the guide pin 51 or the guide cam 53 or a dimensional error of the guide cam 53, the left door 2 is moved in the direction of the right door 3 and the front-back direction by the gap, and the hinge pin 23 is moved. Can reach the predetermined first locking position. Therefore, it is possible to ensure the sealed state between the left door 2 and the housing 1, and it is possible to maintain the distance between the left door 2 and the housing 1 at a predetermined distance.

Further, as shown by the broken line B1 in FIG. 5, the hinge groove 9 may be extended in the longitudinal direction.
That is, by making the distance in the longitudinal direction of the hinge groove 9 longer than the moving distance of the hinge pin 23 that relatively moves from the first locking position to the second locking position, the hinge pin 23 and the hinge pin 23 normally in the first locking position are A gap in the longitudinal direction of the hinge groove 9 is formed between the groove 9 and the groove 9. The first locking position at this time is positioned by engagement of the guide pin 51 and the guide groove 52 in the substantially left-right direction in the figure, and is positioned by engagement of the hinge pin 23 and the hinge groove 9 in the substantially front-back direction. .

As a result, even if there is a mounting error of the guide pin 51 or the guide cam 53 or a dimensional error of the guide cam 53, the left door 2 can move in the direction of the right door 3 and the front-back direction by the gap. . Therefore, the sealed state between the left door 2 and the housing 1 can be ensured, and the right door 3
The distance between and can be maintained at a predetermined distance. At this time, the hinge pin 23 is not arranged at a predetermined first locking position, and the first locking position of the cam mechanism is arranged in the packings 41 to 43 and the elastic forces of the packings 6 and 7 and these packings. The position is balanced with the magnetic force of the magnet.

Although the operation of the left door 2 has been described above, the right door 3 also has the same cam mechanism as the left door 2, so that the same effect as described above can be obtained.
Further, the hinge pin 23 and the hinge groove 9, the guide pin 51 and the guide groove 52, the rib 19 and the boss 10, the auxiliary guide pin 2
In each combination of 5 and the auxiliary guide groove 11, they may be provided on any one of the housing side and the door side as long as they are provided on the other side.

Further, although the present embodiment describes the door opened and closed from the central portion, it is arranged at the front of the opening.
It may be a door opening / closing mechanism that opens and closes the opening with a single door. That is, when there is a wall surface or floor surface on the opening side of the door, it is possible to prevent interference between the end portion of the door and the wall surface by sliding the door away from the wall surface or the like as the door opens. it can. This facilitates opening and closing the door.

Further, the same effect can be obtained not only when the door is opened and closed in the left and right direction but also when the door is opened and closed in the up and down direction and the door which opens and closes a horizontal surface. In the case of a lightweight lid such as a car dashboard. Can also be applied to.

[0068]

According to the present invention, the first locking position is set when the door is closed and the second locking position is set by sliding the door from the open side to the shaft side when the door is opened. A cam mechanism that pivotally supports the door at the locking position is separately arranged on the shaft side and the opening side of the door. Therefore, in the case of a double door, the door is separated from the other door, and sliding of packing or the like arranged between both doors can be avoided.

Therefore, since sliding friction of the packing does not occur, a large force is not required to open and close the door, and the operability can be improved. Even if the packing or the like is not provided, even if the gap between both doors is narrowed to prevent dust, it is possible to prevent interference between one door end and the other door due to rotation. Further, when the opening is opened and closed by a single door, even if there is a wall surface or floor surface on the opening side, the door is separated from the wall surface and the like, and it is possible to prevent interference between the end portion of the door and the wall surface. it can. This facilitates opening and closing the door.

Further, since the door is slid by being guided by the cam mechanism, it is possible to reduce the number of parts without requiring a spring for returning the sliding movement as in the conventional example. Furthermore, since the weight of the door is added to the pivot shaft, the contact area is narrow, sliding friction is small, and a spring with a strong elastic force is not required, so the operating force required to open and close the door can be reduced, further improving operability. can do.

Further, it is possible to dispose a positioning portion for positioning at the first locking position and a guide portion for guiding from the first locking position to the second locking position on the opening side of the door. By arranging the positioning part on the opening side of the door, even if there is a mounting error or dimensional error of the cam mechanism, the opening amount on the opening side of the door is reduced by the error compared to the case where the positioning part is provided on the shaft side. be able to. Therefore, the closed state of the door can be reliably maintained.

Further, the guide portion is arranged on the opening side of the door, and the second
By making the hinge part that pivotally supports the door at the locking position on the shaft side, the angle formed by the guide direction of the guide part and the direction in which the operation force to open the door is applied is more than that when the guide part is arranged on the shaft side. Get smaller. Therefore, the sliding friction of the guide portion is reduced, the operation force when opening and closing the door is reduced, and the operability of the door opening / closing mechanism can be improved.

According to the present invention, the hinge mechanism guides the hinge pin and the guide groove guides the guide pin to move the cam mechanism from the first locking position to the second locking position. By sliding the rib and the boss, it is possible to easily realize a cam mechanism that slides from the first locking position to the second locking position when the door is opened and pivotally supports the door at the second locking position. it can.

Further, according to the present invention, the arcuate portion which is recessed in the circumferential direction centering on the hinge pin at the first locking position is extended to the end portion of the guide groove, whereby the mounting error and the size of the cam mechanism are increased. Even if there is an error, the door can be further rotated in the closing direction at the first locking position, and the closed state of the door can be made more reliable.

Further, according to the present invention, the length of the guide groove or the hinge groove in the relative movement direction is longer than the movement amount of the guide pin or the hinge pin that relatively moves from the first locking position to the second locking position. By doing so, even if there is a mounting error or a dimensional error in the cam mechanism, the door can be moved in the direction of the other door and the front-rear direction so that the hinge pin can reach the predetermined first locking position. Therefore, the sealed state between the door and the main body can be ensured, and the distance between the other door can be maintained at a predetermined distance.

[Brief description of drawings]

FIG. 1 is a cross-sectional top view showing a door opening / closing mechanism according to an embodiment of the present invention.

FIG. 2 is a top view showing a main part of the door opening / closing mechanism according to the embodiment of the present invention.

FIG. 3 is a rear view showing a main part of the door opening / closing mechanism according to the embodiment of the present invention.

FIG. 4 is a front sectional view showing a part of the cam mechanism of the door opening / closing mechanism of the embodiment of the present invention.

FIG. 5 is a plan view showing the operation of the cam mechanism of the door opening / closing mechanism according to the embodiment of the present invention.

FIG. 6 is a plan view showing the operation of the cam mechanism of the door opening / closing mechanism of the embodiment of the present invention.

FIG. 7 is a plan view showing the operation of the cam mechanism of the door opening / closing mechanism of the embodiment of the present invention.

FIG. 8 is a plan view showing the operation of the cam mechanism of the door opening / closing mechanism of the embodiment of the present invention.

[Explanation of symbols]

1 case 1a opening 2 left door 3 right door 4,5 handles 6, 7, 41-46 packing 8 Slide cam member 9 Hinge groove 10 Boss 11 Auxiliary guide groove 16 Lock member 18 Lock cam member 19 ribs 23 Hinge pin 24 lock pin 25 Auxiliary guide pin 32 Lock cam assembly 47, 48 door back 49,50 Door plate 51 guide pin 52 guide groove 53 Guide cam

Claims (8)

[Claims] 1. A door opening / closing mechanism that opens and closes doors that cover both sides of the opening of the device body with the middle of the opening as a boundary, wherein the first locking position is set when the door is closed. In addition, when the door is opened, the cam mechanism that slides the door from the open side to the shaft side to take the second locking position and pivotally supports the door at the second locking position is provided on the shaft side of the door. A door opening / closing mechanism that is placed separately on the open side. 2. The door opening / closing mechanism according to claim 1, wherein the cam mechanism includes a positioning portion for positioning the door at the first locking position on the opening side of the door. 3. The hinge which positions the door at the first and second locking positions, guides the door from the first locking position to the second locking position, and pivotally supports the door at the second locking position. And a guide part for guiding the door from the first locking position to the second locking position and for guiding the door rotating at the second locking position. The door opening / closing mechanism according to claim 1 or 2, further comprising: 4. The door opening / closing mechanism according to claim 3, wherein the cam mechanism is provided with an auxiliary guide portion for guiding the door that rotates in the second locking position, on an axial side of the door. . 5. The cam mechanism includes a hinge pin that serves as a rotation axis of the door when the door is opened, a guide pin arranged on an opening side of the door, and the hinge pin is guided and locked at both ends. As a result, the cam mechanism has a hinge groove that takes first and second locking positions, a guide groove that guides the guide pin from the first locking position to the second locking position, and an arc that is coaxial with the hinge pin. The door opening / closing according to any one of claims 1 to 4, further comprising: a rib arranged along the boss; and a boss having a cylindrical surface that is in sliding contact with the rib at a second locking position. mechanism. 6. The door according to claim 5, wherein an arcuate portion that is recessed in a circumferential direction centered on the hinge pin at the first locking position is provided at an end of the guide groove. Opening and closing mechanism. 7. The length of the guide groove in the relative movement direction is longer than the movement amount of the guide pin that relatively moves from the first locking position to the second locking position. The door opening / closing mechanism according to Item 5. 8. The length of the hinge groove in the relative movement direction is longer than the movement amount of the hinge pin that relatively moves from the first locking position to the second locking position. The door opening / closing mechanism described in 5.