JP2007111800A - Torque wrench - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a switching device in which only appropriate force is applied to a switch body even if excessive force is applied, and a torque wrench including the switching device. <P>SOLUTION: A switch-activated spring 16 comprising a coil spring is provided between a leading edge of a memory key 7 and a switch activator of a switching member 15. When the memory key 7 is depressed, the spring 16 is compressed, and the switch activator is pressed by spring force determined by a spring constant and a deflection amount of the spring 16 to turn ON the switching member 15. To prevent pressing force of the memory key 7 from working on the spring 16 beyond a limit that the spring 16 can bend, a first stopper 17 in contact with the leading edge of the memory key 7 to limit the rotation of the key 7 is provided on a display device case 8. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a switch device that operates a push-type switch ON and OFF, and a torque wrench including the switch device.

  There is provided a torque wrench provided with a display capable of displaying a torque value at the time of normal tightening, an inspection torque value at the time of tightening inspection, and the like on a torque wrench body by digital display (Patent Document 1).

In such a torque wrench, an engaging portion that engages with a head that is a driving surface of a fastening component such as a bolt is provided at a tip portion of the lever member, and a grip portion is provided at a rear portion of the lever member. A display unit including a display is provided.
JP 2004-106075 A

  In the torque wrench provided with the above-mentioned indicator, the operator's posture at the time of tightening the bolt is often performed with the hand placed in front of the body at a position below the face. The display surface is also arranged upward so that it can be confirmed with the face facing down in the working posture.

  However, depending on the position of the bolt to be tightened or the situation around the bolt, the operator may not be able to see the indicator from the front. When the display is viewed obliquely, for example, in a liquid crystal digital display, the visibility is poor and the displayed value may not be clearly read.

  By the way, in such a torque wrench with an indicator, the switch operation may be performed with the grip part held with one hand. However, if the switch operation is performed with one hand in a bad working posture, May add to the switch and cause switch failure. Further, when this switch is mounted on a circuit board, it may be considered that a connection failure with the circuit board occurs.

  The present invention has been made in view of such a viewpoint, and provides a switch device that applies only an appropriate force to a switch body even when an excessive force is applied, and a torque wrench including the switch device. Objective.

  The switch device that achieves the object of the present invention includes a switch body that can be switched on and off by applying an external force to the switch operating body, and an external force applied to the switch operating body. A switch operating member to be applied, an elastic body disposed between the switch operating member and the switch operating body, and applying a force corresponding to a displacement amount of the switch operating member to the switch operating body, and a displacement range of the elastic body And a restricting member for restricting the amount of displacement of the switch operating member.

  In the above configuration, the switch body is attached to a circuit board.

  According to a third aspect of the present invention, there is provided a torque wrench having an engaging portion that engages with a driving surface of a fastening component at a front end portion of a lever member and a rear end of the lever member. A torque wrench provided with a grip part in the part and provided with a display part for displaying the acquired data on a display unit is characterized in that the display part is provided with a switch device having the above-described configuration.

  In the configuration of the torque wrench, the display unit is attached to be rotatable within a certain range with respect to the axis of the lever member.

  According to the switch device and torque wrench of the present invention, even if an excessive external force is applied from the switch operating member, only the force corresponding to the displacement of the elastic member is applied to the switch body, the switch body is broken, and the connection with the circuit board is poor. Such as failure can be prevented, and the durability has been greatly improved.

  FIG. 1 is a top view of a torque wrench showing an embodiment of the present invention, FIG. 2 is a front view of the torque wrench of FIG. 1, a left and right side view of the torque wrench, and a sectional view of each part. FIG. 3 is a diagram illustrating details of the display unit including the switch device, and (a) to (c) are diagrams illustrating an operating state of the switch device provided in the display unit.

  1 and 2, the torque wrench body 1 is engaged with a front part of a lever member 2 formed of a rigid pipe member to engage with a driving part (for example, a bolt head or a nut) of a fastening part. A head 4 to which a socket or the like as a part is attached is attached in a replaceable manner, and a grip member 5 is attached to the rear part of the lever member 2. For example, a strain gauge portion (not shown) is disposed inside the lever member 2, and pressure from the rear end portion of the head 4 inserted in the lever member 2 acts on the strain gauge portion. Thus, a signal for torque detection is output, and this signal is input to the arithmetic processing unit 6 (see FIG. 3) provided in the display unit 3.

  As described above, in the torque wrench having the display unit 3 in the torque wrench main body 1, the operator holds the grip member 5 in a state where the socket is engaged with the head of the bolt, for example, and rotates clockwise, for example. Thus, the bolt is tightened, and the torque value at that time is displayed on the display 3a composed of the liquid crystal display means of the display unit 3 and the display 3b (see FIG. 3) composed of the 7-segment LED display means.

  The torque wrench according to the present embodiment displays the torque value associated with the bolt tightening together with the control number and the like on the indicators 3a and 3b. It has an inspection function to detect and determine whether it is within the appropriate range. This inspection function determines, for example, the torque value at the start of bolt movement as the tightening inspection torque value based on information from the built-in angular velocity sensor, and displays this torque value on the first display 3a. Then, if the inspection torque value (actually measured value) is within a predetermined range with respect to the torque value set for the bolt to be inspected, it is determined to be acceptable, and if it is out of the predetermined range, it is rejected. judge. For example, when the measured value is determined to be the tightening inspection torque value, if this inspection torque value is acceptable, the beep sound is made long, and if it is unacceptable, the beep sound is short and discontinuous. Informs pass / fail judgment instantly.

  A power switch, a counter feed key, a counter return key, a mode key, and a clear key (all not shown) are arranged on the top surface of the display unit 3, and a grip member 5 is held on the front surface of the display unit 3. A memory key 7 is arranged at a position where the thumb of the worker's hand hits.

  The display unit 3 includes a display case 8 that holds the displays 3a and 3b, a display cover 9 that protects the displays 3a and 3b held in the display case 8, and the display case 8 and the display cover. 9 and a protective cover 10 that protects the bottom surface of the display case. The display cover 9 is arranged so as to overlap the top surface of the display case 8.

  The display case 8 is formed in a substantially concave shape in cross section, and the concave portion is formed in a circular shape in which a part in which the lever member 2 having a circular cross section is rotatably fitted is cut out (notch portion 8a). . The lever member 2 to which the display case 8 is rotatably fitted has a stopper pin 11 penetratingly fixed in the diameter direction, and the display case 8 constituting the display unit 3 is rotated around the axis of the lever member 2. When the penetrating end portion 11a of the stopper pin 11 comes into contact with one end of the notch portion 8a to restrict further rotation and the display case 8 is rotated in the opposite direction, the stopper pin is attached to the other end of the notch portion 8a. 11, the penetrating end 11 a is in contact with each other and restricts the rotation of the display case 8 in both directions. In the present embodiment, the rotation range of the display unit 3 is set to 90 °, but is not limited to this.

  A rotation set screw 12 that engages with the lever member 2 in the radial direction is screwed to the rear end portion of the display case 8. In this embodiment, the lever member 2 has both ends of the rotation range of the display portion 3. Thus, holes 2a and 2a are formed to engage the distal ends of the rotation set screws 12, respectively, so that the rotation of the display unit 3 can be fixed at both ends of the rotation range. Of course, the display unit 3 can be fixed at an arbitrary position within the rotation range by increasing the number of the holes 2a.

  On the other hand, the display case 8, the display cover 9, and the protective cover 10 constituting the display unit 3 are integrated using a fixing screw 13, and the display case 8 is connected to the display cover 9 and the protective cover 10. It is being fixed so that it may be pinched | interposed with a bottom face part. The fixing screw 13 is formed with a first screw portion 13c at a tip portion of a shaft portion 13b extending from the head portion 13a. Is formed. The display case 8 is formed with a through hole 8a. The through hole 8a is formed as a non-screw hole on one side of the display cover 9, and the other side is formed as a screw hole 8b. . Further, the display cover 9 is formed with a screw hole 9a into which the first screw portion 13c of the fixing screw 13 is screwed.

  When the fixing screw 13 is inserted into the opening 10 b formed in the bottom surface portion 10 a formed in a substantially arc shape of the protective cover 10 and is rotated, the first screw portion 13 c immediately turns into the screw hole 8 b of the through hole 8 a of the display case 8. (In this state, the display cover 9 is not overlaid at a predetermined position). When the screwing of the first screw portion 13c and the screw hole 8b is finished, the second screw portion 13d starts to screw into the screw hole 8b. The second screw portion 13d is screwed into the screw hole. When the operation is finished, the fixing screw 13 can move up and down in the through hole 8a. However, due to the interference between the lower end of the second screw portion 13d and the upper end of the screw hole 8b, downward slipping (falling) is prevented. .

  In this state, the display cover 9 is aligned with the upper surface of the display case 8 and overlapped at a predetermined position. When the first screw portion 13c is screwed into the screw hole 9a of the display cover 9, the fixing screw 13 is screwed. The display case 8 is clamped between the display cover 9 and the protective cover 10 by the axial force generated between the first screw portion 13c and the head portion 13a, and is integrally fixed.

  Therefore, even if the fixing screw 13 is loosened during use of the torque wrench and the first screw portion 13 c is unscrewed from the screw hole 9 a of the display cover 9, the second screw portion 13 d is the through hole of the display case 8. Since the fall is prevented by interference with the screw hole 8b formed in a part of 8a, it is possible to prevent the fixing screw from being accidentally dropped into the workpiece.

  As a configuration of the display unit 3, as described above, the memory key 7 as a switch lever is attached to the display case 9.

  In the display unit 3 of the present embodiment, the display case 9 is provided with a circuit board 14 constituting the processing device 6 in addition to the two displays 3a and 3b described above.

  A switch member 15 corresponding to the memory key 7 is fixed to the circuit board 14. Therefore, the switch member 15 can be turned on and off by pressing the memory key 7.

  In the present embodiment, a switch operating spring 16 made of a coil spring is disposed between the tip of the memory key 7 and the switch operating body of the switch member 15, and when the memory key 7 is pushed in, the switch operating spring 16 is compressed. The switch actuating body is pushed in by a spring force determined by the spring constant of the switch actuating spring 16 and the amount of deflection, and the switch member 15 is turned on.

  Therefore, even if the memory key 7 is pushed in strongly, the pressing force is not directly applied to the switch operating body, so that the switch member 15 can be prevented from malfunctioning.

  By the way, when the pressing force of the memory key 7 is applied to the switch operating spring 16 beyond the limit that the switch operating spring 16 can bend, the pressing force directly acts on the switch operating body. A first stopper portion 17 is provided in contact with the tip of the memory key 7 to restrict the rotation of the memory key 7. Further, the display case 8 is provided with a second stopper portion 18 so that the memory key 17 is lightly received by the spring force of the switch operating spring 16 and is held in the OFF state without play.

  In the case of working with the display unit 3 rotated from the normal position shown in FIG. 1 as in the present embodiment, an unreasonable force may be applied to the memory key 7, but even in such a case, Since a large force is not applied to the switch member 15, a switch failure can be prevented.

  It should be noted that an elastic member such as rubber or a leaf spring can be used instead of the switch operating spring 16 formed of a coil spring.

  Moreover, in this Embodiment, although the switch apparatus demonstrated and demonstrated the case where it provided in the display part of the torque wrench, this invention is not limited to this.

The top view of the torque wrench which shows embodiment of this invention. The front view of the torque wrench of FIG. 1, the left-right side view of this torque wrench, and sectional drawing of each part are shown. FIG. 3 is a diagram illustrating details of the display unit, and FIGS. 3A to 3C are diagrams illustrating a configuration of a switch provided in the display unit.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Torque wrench main body 2 Lever member 2a Hole part 3 Display part 3a, 3b Indicator 4 Head 5 Grip member 6 Arithmetic processing measure 7 Memory key 8 Indicator case 8a Notch part 8a Through hole 8b Screw hole 9 Display cover 9a Screw hole DESCRIPTION OF SYMBOLS 10 Protective cover 11 Stopper pin 11a Through-end part 12 Rotation set screw 13 Fixing screw 13a Head part 13b Shaft part 13c 1st screw part 13d 2nd screw part 14 Circuit board 15 Switch member 16 Switch operating spring 17 1st stopper part 18 1st 2 stopper part

Claims (4)

  A switch body that is switched on and off by applying external force to the switch operating body, a switch operating member that applies external force to the switch operating body, and disposed between the switch operating member and the switch operating body, A switch comprising: an elastic body that applies a force corresponding to a displacement amount of the switch operation member to the switch operating body; and a restriction member that restricts the displacement amount of the switch operation member within a displacement range of the elastic body. apparatus.   The switch device according to claim 1, wherein the switch body is attached to a circuit board. An engaging portion that engages with the driving surface of the fastening component is provided at the front end portion of the lever member, and a grip portion is provided at the rear end portion of the lever member, and a display portion that displays the acquired data on the display is provided. In the wrench
A torque wrench, wherein the display unit is provided with the switch device according to claim 1.   The torque wrench according to claim 3, wherein the display unit is attached so as to be rotatable within a certain range with respect to the axis of the lever member.

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