TW201836779A - Tightening tool - Google Patents

Abstract

A tightening tool is configured to make the operator feel that a tightening torque generated by tightening a tightening member reaches a preset torque value when the operator tightens the tightening member. The tightening tool includes: a casing of the tightening tool; a head configured to transmit the tightening torque to the tightening member; a head pin configured to pivotally support the head in the casing; a pressing part configured to press the head by a predetermined pressing force; a contact part provided in the head and configured to contact the casing by the rotation of the head when the tightening torque reaches the preset torque value and is applied; and a gain adjusting screw threadably mounted on the head to adjust a gain of the action of the head. The gain adjusting screw is a male screw to prevent screw loose. The present invention is able to keep a high-accuracy alarm function of a mechanical torque wrench.

Description

Locking tool

The invention relates to a locking tool.

A known torque wrench is a type of torque wrench that allows an operator to perceive that the locking torque generated when a locking member such as a bolt or nut is locked has reached a torque value (hereinafter referred to as a torque value) preset in a locking tool. "Set torque value") to manage the tightening torque of the locking tool. Generally speaking, there are so-called pre-locking torque wrenches and preset torque wrenches in the torque wrench. The former cannot change the setting torque value unless the former uses a setting tool, and the latter can use the tool without The set torque value can be notified by the operator's operation.

In the mechanical preset type torque wrench, when the locking member is locked, once the locking torque reaches the set torque value, the head will contact the housing and other places to generate sound and vibration, so that the operator Perceives that the set torque value has been reached.

A gain adjustment screw is provided in the head, which adjusts the position between the head and the housing in a state where no locking torque is applied, and adjusts the operation gain of the head.

It should be noted that, in the related art of the gain adjustment screw of the torque wrench, a technique of screwing a correction screw for gain adjustment to a handle portion is disclosed (for example, see Patent Document 1).

[Patent Document 1] Japanese Unexamined Patent Publication No. 9-141567

However, including the technology of Patent Document 1, in the conventional torque wrench, if the gain adjustment screw becomes loose due to vibration or the like generated during use, there is a problem that the tightening torque value cannot be accurately notified.

It should be noted that, in the existing torque wrench, in order to suppress the loosening of the gain adjustment screw, some of them are provided with a liquid-type screw locker or a resin ring-proof member such as a resin ring on the internal thread side. However, when installing this anti-loosening member, there is a trouble that the anti-loosening member needs to be assembled and repaired.

The purpose of the present invention is to maintain a high notification accuracy in a mechanical torque wrench.

The invention provides a locking tool, which is used to make an operator feel that the locking torque generated when the locking member is locked by the operator has reached a preset set torque value. The locking tool includes a housing, It constitutes the outer shape of the locking tool; the head is used to transmit the locking torque to the locking member; the head pin pivotally supports the head in the housing; the pressing part presses the head with a predetermined pressing force A contact portion, which is provided on the head, and when the applied locking torque reaches a set torque value, the head rotates inside the casing so that the contact portion contacts the casing; and a gain adjustment screw, which is in contact with the head Screw in and adjust the operating gain of the head. The gain adjustment screw is formed with an external thread that suppresses loosening of the screwing force.

Further, in the present invention, the loosening of the screwing force of the external thread can be suppressed by the shape of the thread.

In addition, in the present invention, the external thread may have a shape that generates an elastic force when screwed to the internal thread.

According to the present invention, a high notification accuracy can be maintained in a mechanical torque wrench.

Hereinafter, embodiments of the locking tool of the present invention will be described with reference to the drawings. In the following description, a locking tool that allows an operator to feel that the locking torque has reached a preset set torque value is provided with a torque value setting unit capable of setting the set torque value by rotating the rotating member. A torque wrench will be described as an example.

[Composition of torque wrench]

FIG. 1 is a perspective view of a torque wrench 10 showing an embodiment of a locking tool according to the present invention. FIG. 2 is a front view of the torque wrench 10. As shown in FIGS. 1 and 2, the torque wrench 10 is a so-called mechanical preset type torque wrench. In the torque wrench 10, the head 12 and the housing 11 that are rotated by the torque generated during the locking operation generate sound and vibration when they contact each other, so that the operator feels that the locking torque has reached the set value. The torque wrench 10 includes a housing 11, a head 12, a head pin 13, a torque value setting section 18, and a rotation angle detection section 19.

The housing 11 is a component for accommodating the torque wrench 10 such as the head 12 and is a substantially cylindrical member constituting the external shape of the torque wrench 10. A head 12 is provided at one end of the casing 11. A torque value setting unit 18 and a rotation angle detection unit 19 are provided at the other end of the housing 11.

FIG. 3 is a bottom view of the torque wrench 10. As shown in FIG. 3, a ratchet head 121 is provided in the head 12. The ratchet head 121 is exposed from the casing 11. The ratchet head 121 is provided with a sleeve connection portion 124 so as to be detachably mounted to a socket wrench engaged with a locking member (not shown, which is used to lock a bolt or a nut).

FIG. 4 is a partial cross-sectional view showing the internal structure of the torque wrench 10. In FIG. 4, in order to show the internal structure of the torque wrench 10, only a cross section of the housing 11 and the housing 198 of the rotation angle detection unit 19 is shown. As shown in FIG. 4, inside the housing 11, as the internal structure of the torque wrench 10, an arm 122 of the head 12, a contact portion 123, a gain adjustment screw 14, a link 15, a slider 16, and a spring guide are accommodated. Piece 17 and the torque value setting section 18.

The head 12 is provided with an arm 122 and a contact portion 123 inside the housing 11. The head 12 is rotatably supported by a head pin 13 provided at a boundary between the ratchet head 121 and the arm 122 with respect to the housing 11.

The arm 122 is housed inside the casing 11. Since the head 12 is pivotally supported by the housing 11 through the head pin 13, the arm 122 can rotate inside the housing 11 with the head pin 13 as a center.

FIG. 5 is a partial enlarged view showing the arm 122 of the torque wrench 10 and the periphery of the gain adjustment screw 14. As shown in FIG. 5, the contact portion 123 is provided on an end opposite to the end of the arm 122 supported on the side of the head pin 13. When the arm 122 rotates inside the casing 11, the contact portion 123 makes contact with the inner wall of the casing 11 to emit sound and vibration. The contact portion 123 is provided in a direction in which the arm 122 rotates when a load of a locking operation is applied to the head portion 12. Further, in the aforementioned end portion of the arm 122 of the head portion 12, the gain adjustment screw 14 is provided so as to penetrate the head portion 12 in the width direction in FIG. 4. The gain adjustment screw 14 is provided for adjusting an operation gain of the arm 122 when a tightening torque is applied to the torque wrench 10. The gain adjustment screw 14 is screwed into a female screw thread hole 125 formed in the arm 122. The arm 122 is provided with a link 15 connected to the slider 16 through a link mechanism.

FIG. 6 is a perspective view showing the gain adjustment screw 14 of the torque wrench 10. As shown in FIG. 6, the gain adjustment screw 14 is a hexagon socket headless screw (set screw) type screw in which an external thread 142 is formed on the entire side surface of the shaft-like body portion 141. The gain adjustment screw 14 adjusts the positions of the head 12 and the housing 11 in a state where no tightening torque is applied, and adjusts the operation gain of the arm 122 when the tightening torque is applied to the torque wrench 10.

The gain adjustment screw 14 is formed so that the shape of the male screw 142 can be prevented from loosening. The external thread 142 has, for example, a slit at the top of the thread that divides the thread into two parts. When the external thread 142 is formed in such a manner as to be screwed into the screw hole 125, the divided screw surfaces apply elastic force to the surface of the screw hole 125, respectively. Due to this elastic force, the gain adjustment screw 14 suppresses loosening caused by impact or the like when the torque wrench 10 is operated.

One end of the slider 16 is connected to the arm 122 via the link 15, and the other end is connected to the spring guide 17. When the casing 11 is rotated relative to the head 12, the slider 16 moves in the length direction inside the casing 11. In addition, the slider 16 includes a roller that is in contact with the inner wall of the housing 11. The roller is used to guide the movement of the slider 16 in the housing 11.

The spring guide 17 is a substantially cylindrical member. The spring guide 17 is formed in a cylindrical shape and is arranged inside the casing 11. The axis of the spring guide 17 and the axis of the casing 11 are substantially the same. The spring guide 17 guides the movement of the spring portion 181 of the torque value setting portion 18. A hole is provided at the center of the bottom surface of the spring guide 17. The other end of the slider 16 is inserted into the hole of the spring guide 17. The other bottom surface of the spring guide 17 is in contact with one end of the spring portion 181.

A spring portion 181, a torque value display portion 182, a setting bolt 183, and a lock nut 184 of the torque value setting portion 18 are provided inside the casing 11. The torque value setting unit 18 includes a torque value setting handle 185 outside the casing 11. By rotating the torque value setting handle 185, the torque value setting portion 18 can change the compression force of the spring portion 181 to set the set torque value. The torque value setting portion 18 has a function of a pressing portion by pressing the head with a predetermined compression force generated by the spring portion 181 as a pressing force.

The spring portion 181 is a compression spring whose compression direction is the longitudinal direction of the torque wrench 10. As the spring portion 181, for example, a coil spring can be used. As described above, one end of the spring portion 181 is in contact with the other plane of the spring guide 17.

The torque value display section 182 is a substantially cylindrical member disposed inside the housing 11. The torque value display portion 182 is disposed so that one end thereof is in contact with the other end of the spring portion 181 and the other end faces the direction of the torque value setting handle 185. The torque value display section 182 displays a scale for indicating the set torque value on the surface. A rotation stopper (not shown) is attached to an inner wall of the casing 11. The torque value display section 182 is provided so as to be able to slide in the axial direction of the torque wrench 10 with respect to the rotation stopper. By rotating the stopper in this way, the torque value display portion 182 can move in the axial direction without rotating inside the housing 11. Therefore, the scale of the torque value display section 182 can always be read from the display window provided in the housing 11. In addition, a female screw threaded through the longitudinal direction is provided at the center of the torque value display section 182.

The setting bolt 183 is screwed into the internal thread of the torque value display section 182. The flange-shaped portion of the setting bolt 183 is engaged with the lock nut 184.

The lock nut 184 is a substantially disk-shaped member fixed inside the housing 11. The center portion of the lock nut 184 is provided with a hole through which the shaft-shaped portion of the setting bolt 183 is inserted.

The torque value setting handle 185 is a substantially cylindrical member provided at the other end of the torque wrench 10. The torque value setting handle 185 has a function of a rotating member. The torque value setting handle 185 is connected to the setting bolt 183 via the rotation angle detection unit 19 and rotates the setting bolt 183.

The rotation angle detection unit 19 includes a rotation shaft 191, a substrate 192, an encoder unit 193, a disc 194, a setting value calculation unit (not shown), and a communication unit (not shown) inside the housing 198.

The rotation shaft 191 is connected to the setting bolt 183 and the torque value setting handle 185 shown in FIG. 4 in cooperation with each other. The rotation value of the torque value setting handle 185 of the rotation shaft 191 to which the free operator rotates is transmitted to the setting bolt 183.

The substrate 192 is a member on which electronic components such as an encoder unit 193, a setting value calculation unit, and a communication unit can be placed. As the substrate 192, for example, a known electronic circuit substrate such as a printed circuit board can be used. The substrate 192 is provided with a hole through which the rotation shaft 191 passes.

The encoder unit 193 includes a light-emitting element, a light-receiving element, a signal processing section, and the like, which are not shown in the figure. As the encoder unit 193, an absolute encoder or an incremental encoder generally known as a rotary encoder can be used.

The light emitting element is, for example, various light sources such as a light emitting diode and a laser diode. The light-emitting element is used to irradiate the disk 194 with light. The light receiving element may be, for example, a photodiode or the like. The light receiving element is used to receive light that has not changed in light receiving state due to reflection, shading, or refraction of the disk 194 among the light irradiated from the light emitting element. The light receiving element outputs a light receiving signal based on the received light. The signal processing unit performs signal processing such as amplifying the light receiving signal output from the light receiving element, detects the rotation angle of the setting bolt 183, and outputs the rotation angle information output as an electronic message based on the detected rotation angle of the setting bolt 183 to the setting. Value calculation department.

The center of the disk 194 is inserted through the rotation shaft 191 and rotates together with the rotation shaft 191. The disc 194 is used to change the light receiving state of the light receiving element.

The disc 194 changes the light receiving state of the light receiving element by not transmitting light from the light emitting element. The disc 194 is a substantially cup-shaped member including a disc-shaped flat portion, a side portion provided on the outer periphery of the flat portion, and a light transmitting portion provided on the side portion. The planar portion and the side portion of the disc 194 are opaque (light-shielding). The light-transmitting portion is provided with slits at equal intervals in the side portion, and transmits light from the light-emitting element.

It should be noted that the disc 194 is not limited to the transmissive type having a light transmitting portion as described above, and the light from the light emitting element may be refracted by, for example, a prism to change the light receiving state of the light receiving element.

In addition, the disk 194 is not limited to the substantially cup-shaped one having the flat portion and the side portion as described above, and may be, for example, a circular plate shape having a light transmitting portion on the flat portion. In this case, the encoder unit 193 is provided so as to sandwich the flat portion of the disc 194.

The setting value calculation unit calculates the rotation angle (the number of rotations and the rotation amount) of the setting bolt 183 based on a signal output from the signal processing unit of the encoder unit 193. The set value calculation unit calculates a set torque value set from the torque value setting knob 185 based on the rotation angle of the set bolt 183. In the setting value calculation unit, it is considered that the compression force of the spring portion 181 changes depending on the rotation angle of the setting bolt 183, and the setting torque value of the torque value setting unit 18 is calculated based on the detected rotation angle of the setting bolt 183.

The communication unit sends a message related to the locking operation of the locking member including one of the set torque value data and the rotation angle information output by the set value calculation unit to an external device such as a server that manages the set torque value data. (Message processing device, not shown).

[Operation of Torque Wrench] The operation of the torque wrench 10 described above is described by taking an example in which an operator performs a locking operation of a locking member using a predetermined locking torque value.

When the torque value setting handle 185 is rotated, the setting bolt 183 is also rotated together with the torque value setting handle 185. When the set bolt 183 is rotated, the torque value display portion 182 moves inside the housing 11 to compress the spring portion 181, and the compression force of the spring portion 181 changes. The worker confirms that the set torque value indicated by the torque value display section 182 is a predetermined value, stops the rotation operation of the torque value setting handle 185, and switches to the locking operation.

FIG. 7 is a partial cross-sectional view showing an internal structure in a state where a load equal to or greater than a predetermined set torque value is applied to the torque wrench 10. FIG. 8 is a partially enlarged view showing the periphery of the arm 122 and the gain adjustment screw 14 shown in FIG. 7. As shown in FIGS. 7 and 8, in the torque wrench 10, when the locking member is locked, a compressive force from the spring portion 181 acts on the head 12 via the slider 16 and the coupling 15. When the locking torque reaches the set torque value set by the torque value setting portion 18, the force generated by the locking torque of the head portion 12 exceeds the compressive force from the spring portion 181, so that the housing 11 and the slider 16 are driven from The state of FIG. 4 moves to the state of FIG. 7.

The casing 11 is rotated around the head pin 13 and separated from the gain adjustment screw 14, and the inner wall of the casing 11 contacts the contact portion 123. In the torque wrench 10, once the contact portion 123 contacts the inner wall of the housing 11, sound and vibration are generated from the torque wrench 10.

When the torque from the torque wrench 10 to the locking member is eliminated, the housing 11 of the torque wrench 10 returns from the state of FIG. 7 to the state of FIG. 4. At this time, the gain adjustment screw 14 comes into contact with the inner wall of the housing 11 again, and sound and vibration are generated from the torque wrench 10. That is, the gain adjustment screw 14 receives an impact when it comes into contact with the inner wall of the housing 11 again.

In the torque wrench 10 described above, by using the gain adjustment screw 14 having a shape capable of suppressing loosening, the loosening of the screw can be suppressed. Therefore, according to the torque wrench 10 described above, the trouble of assembling the anti-loosening member and performing maintenance can be reduced, so that a high notification accuracy can be maintained in the mechanical torque wrench.

In addition, in the torque wrench 10 described above, since the shape of the thread suppresses loosening, it is possible to suppress loosening of the gain adjustment screw 14 without using a loosening member.

10‧‧‧ torque wrench

11‧‧‧ shell

12‧‧‧ head

13‧‧‧ first pin

14‧‧‧Gain adjustment screw

15‧‧‧ link

16‧‧‧ Slider

17‧‧‧ spring guide

18‧‧‧Torque value setting section

19‧‧‧Rotation angle detection section

121‧‧‧ Ratchet head

122‧‧‧ arm

123‧‧‧Contact

124‧‧‧ Sleeve connection

125‧‧‧ screw holes

141‧‧‧Body

142‧‧‧external thread

181‧‧‧Spring Department

182‧‧‧Torque value display section

183‧‧‧Set bolt

184‧‧‧Locking nut

185‧‧‧Torque value setting handle

191‧‧‧rotation axis

192‧‧‧ substrate

193‧‧‧ Encoder Unit

194‧‧‧Disc

198‧‧‧shell

FIG. 1 is a perspective view of a torque wrench showing an embodiment of a locking tool according to the present invention. FIG. 2 is a front view of the torque wrench shown in FIG. 1. FIG. 3 is a bottom view of the torque wrench shown in FIG. 1. FIG. 4 is a partial cross-sectional view showing the internal structure of the torque wrench shown in FIG. 1. FIG. 5 is a partially enlarged view showing an arm of the torque wrench shown in FIG. 4 and a periphery of a gain adjustment screw. FIG. 6 is a perspective view showing a gain adjustment screw of the torque wrench shown in FIG. 1. Fig. 7 is a partial sectional view showing an internal structure in a state where a load equal to or greater than a predetermined set torque value is applied to the torque wrench shown in Fig. 1. FIG. 8 is a partial enlarged view showing an arm of the torque wrench shown in FIG. 7 and a periphery of a gain adjustment screw.

Claims (3)

A locking tool is used to make an operator feel that a locking torque generated when an operator operates to lock a locking member has reached a preset set torque value. The locking tool includes: a housing, which constitutes the housing The outer shape of the locking tool; a head for transmitting a locking torque to the locking member; a head pin for pivotally supporting the head in the housing; a pressing part for pressing with a predetermined pressing force The head portion; a contact portion provided on the head portion, and when the applied tightening torque reaches the set torque value, the head portion rotates in the casing so that the contact portion contacts the casing; and The gain adjustment screw is screwed with the head and adjusts the operation gain of the head. The gain adjustment screw is formed with an external thread for suppressing loosening of the screwing force. The locking tool according to claim 1, wherein the loosening of the screwing force of the external thread is suppressed by the shape of the thread. The locking tool according to item 2 of the scope of patent application, wherein the external thread is in a shape that generates elastic force when screwed to the internal thread.