JP2012028066A - Trigger switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a trigger switch that is a contact driving member which slides by sliding operation on a trigger, and has a structure alleviating an impact on an operation shaft associated with the contact driving member from whichever direction an impact load is placed on the trigger.SOLUTION: The trigger switch includes a fixed contact and a movable contact provided in a case to contact and leave each other, the contact driving member which is stored slidably in the case and drives the movable contact, and the operation shaft provided on the trigger operated by a user so as to engage with the contact driving member, a tip part of the operation shaft being abutted against a wall part of an end of the contact driving member.

Description

  The present invention relates to a trigger switch. More specifically, the present invention relates to a trigger (contact driving member) which is connected to an operating lever (trigger) provided on a switch used for a power tool switch. The present invention relates to a trigger switch having a structure that reduces the impact even when an impact load is applied to an operation lever by being in contact.

  As shown in FIGS. 13 to 15, the trigger switch according to the prior art as the first example has a contact sliding member 13a slidably mounted on a case 11 on which a contact member 12 is mounted, and the contact sliding member 13a. The operation shaft 22a formed integrally with the distal end portion is connected and fixed to the operation shaft engagement hole 41 of the trigger 21a.

  The contact drive member 13a is formed in a substantially rectangular parallelepiped shape, and a long operation shaft 22a is integrally formed at the tip thereof, and the return spring 27 is engaged by penetrating in a semi-cylindrical shape on the ceiling side at the center of the body. A return spring engaging portion 15 to be supported is provided, and a contact sliding portion 16 formed of an oscilloscope that slides a movable contact is provided at the bottom, and a slide resistor 26 provided on a substrate 25 that controls the speed is slid on a lateral side. The slide speed control unit 17 including the slide spring 28 to be moved is provided.

As described above, the trigger 21a has a structure in which the operation shaft engaging hole 41 that is connected and engaged with the operation shaft 22a formed integrally with the contact driving member 13a is provided.
The operating shaft engaging hole 41 is engaged with a connecting shaft 22b provided on the distal end side of the operating shaft 22a. The operating shaft engaging hole 41 is formed in a cylindrical hole shape to which the connecting shaft 22b is coupled, and is formed on the concave and convex portions of the connecting shaft 22b. It is structured to be coupled and locked to the surface side.

  As a second example, as shown in FIG. 16 and FIG. 17, disclosed in Japanese Patent Application Laid-Open No. 2006-310227, a fixed contact and a movable contact provided inside and outside the main body, and inside the main body, A contact drive member 4 that is slidably received and drives a movable contact, and an operation shaft 5 provided on a trigger 6 that is engaged with the contact drive member 4 at one end and operated by a user at the other end protruding from the main body. The operating shaft 5 is in an engaged state having a play that can be tilted with respect to the contact driving member 4, and in order to create this play, the contact driving member 4 is substantially perpendicular to the operating shaft 5, and It has a wall portion 4a provided with a notch, and the operation shaft 5 has an engagement groove 5a that engages with the notch 4b.

  In the contact drive member 4 having such a structure, the engagement groove 5a of the operation shaft 5 is engaged with the notch 4b provided in the wall portion 4a to be engaged with the contact drive member 4. By doing so, the engagement state between the operation shaft 5 and the contact drive member 4 is an engagement state in which play is provided, and in particular, the loose engagement state between the groove width of the engagement groove 5a and the width of the notch 4b. Thus, it is possible to respond gently to the vertical movement on the trigger 6 side.

JP 2006-310227 A

  However, in the trigger switch described in the prior art, since the operation shaft is formed integrally with the contact driving member, the sliding operation of the trigger is directly related to the sliding operation of the contact driving member. Therefore, when an impact load is applied to the trigger, there is a problem that the base portion of the operation shaft is damaged.

  Further, as in the second example, in the structure having play at the contact position of the operation shaft with the contact drive member, the play is created by engaging the notch of the operation shaft with the notch, Even if it is possible to cope with a predetermined unexpected vertical movement at a certain angle, it is not possible to cope with any inadvertent movement, and there is a problem that a failure occurs between the operation shaft and the contact driving member.

  Therefore, it is a contact drive member that slides by the sliding operation of the trigger, and the structure is such that the impact to the operation shaft related to the contact drive member is alleviated even if an impact load from any direction is applied to the trigger. Has challenges that must be met.

  In order to solve the above problems, the trigger switch of the present invention is configured as follows.

(1) The trigger switch includes a fixed contact and a movable contact that are detachably provided in the case, a contact drive member that is slidably accommodated in the case and drives the movable contact, and a trigger that is operated by a user. An operation shaft for engaging with the contact driving member is provided, and the tip of the operation shaft is in a state of being attached to the wall portion of the end of the contact driving member.
(2) The trigger switch according to (1), wherein an engagement portion that engages in a concave-convex relationship is provided at a location where the wall portion abuts.
(3) The trigger switch according to (2), wherein the engaging portion is configured to be locked by a ring of another member.

  The trigger switch according to the present invention has a structure in which the end of the operation shaft formed integrally with the trigger is in contact with the end of the contact drive member with respect to the contact drive member housed in the case. Therefore, even if an excessive impact is applied to the trigger, the contact drive member and the operating shaft are not in close contact with each other, but are in contact with each other. Can do.

It is a whole perspective view in the state where the cover of the trigger switch of the 1st example concerning the present invention was removed. It is a perspective view which shows the relationship between a contact drive member and a trigger similarly. FIG. 3 is a plan view with the cover removed. FIG. 4 is a cross-sectional view taken along line AA in FIG. It is a top view which shows the state which operated the trigger and pulled in the same. FIG. 6 is a cross-sectional view taken along line AA in FIG. It is a whole perspective view of the state where the cover of the trigger switch of the 2nd example concerning the present invention was removed. It is a perspective view which shows the relationship between a contact drive member and a trigger similarly. FIG. 3 is a plan view with the cover removed. FIG. 10 is a cross-sectional view taken along line AA in FIG. It is a top view which shows the state which operated the trigger and pulled in the same. FIG. 12 is a cross-sectional view taken along line AA in FIG. 11. It is a whole perspective view in the state where the cover of the trigger switch of the 1st example of the prior art was removed. FIG. 3 is a plan view with the cover removed. It is the sectional view on the AA line in FIG. It is the perspective view which showed the principal part of the trigger switch of the 2nd example of a prior art. It is sectional drawing which shows the state which the operating shaft engaged similarly.

  An embodiment of a trigger switch according to the present invention will be described with reference to the drawings.

  As shown in FIGS. 1 to 6, the trigger switch of the first example according to the present invention accommodates a contact member 12 having a movable contact at a proper position in the internal space of the cover and the case 11, and the contact member 12. The contact drive member 13 that performs the contact operation by sliding the contact drive member 13 and the trigger 21 that integrally forms the operation shaft with respect to the contact drive member 13 are provided.

The contact driving member 13 is formed in a substantially rectangular parallelepiped shape, and a wall portion 14 is formed at a tip portion of the contact driving member 13 to associate with the tip portion 23 of the operation shaft 22. A return spring engaging portion 15 that penetrates and supports the return spring 27 is provided, and a slide that slides on a slide resistor 26 provided on a control board 25 that controls the speed on the side of the return spring engaging portion 15 is provided. A slide speed control unit 17 having a spring 28 is provided, and a contact point slide formed by an oscilloscope 18 that slides on the surface of a plate part having a movable contact at the end at a position on the opposite side of the return spring engagement unit 15. The moving part 16 is provided.

  The contact sliding portion 16 includes an oscilloscope 18 which is shifted in parallel to the opposite side of the return spring engaging portion 15 and is given elastic force by a spring, and the tip of the oscilloscope 18 has a movable contact at the end. It has a structure that slides in contact with the surface of the provided plate portion.

  The return spring engaging portion 15 is configured to engage the return spring 27, engage one end of the return spring 27 with the wall portion of the case 11, and elastically bias the contact driving member 13 itself in the trigger direction. It has become.

  As described above, the operation shaft 22 is formed integrally with the trigger 21, and a ring mounting groove 24 for securing the operation shaft 22 with an E ring (E-type retaining ring) 31 is provided on the distal end side of the operation shaft 22. The distal end portion 23 is in contact with the surface of the wall portion 14 to be attached.

In this manner, the contact driving member 13 is brought into contact with the movable contact so as to be slidable, and the distal end portion 23 of the operation shaft 22 is brought into contact with the wall portion 14 of the contact driving member 13. Then, the contact drive member 13 itself is biased in the direction of the trigger 21 by the return spring 27 engaged with the contact drive member 13 and the return spring engaging portion 15, so that the wall portion 14 and the tip of the operation shaft 22 are moved. The state where the contact with the portion 23 is always attached is maintained. When the trigger 21 is pulled in this state, the contact driving member 13 is slid in the back direction of the case 11 by being pulled against the return spring 27 in a state where the tip 23 of the operation shaft 22 is in contact with the wall 14. To do.
When sliding and sliding, the contact sliding portion 16 slides on the plate portion of the movable contact to turn on the contact, and the slide spring 28 of the slide speed control portion 17 is moved to the slide resistor 26 of the control board 25. The speed is controlled by sliding on the top. In this state, when the lock button 32 is turned on, the pulled-in state is maintained, and further, by pushing the trigger 21, the lock state by the lock button 32 is released. Pushed back to the state.

Next, a trigger switch of the second example will be described with reference to the drawings.
Compared with the trigger switch of the first example, the trigger switch of the second example is loosely fitted with a guide convex portion protruding from the wall portion at the tip of the operation shaft that contacts the wall portion of the contact sliding member. It is a structure to be made.

  The trigger switch of the second example having such a structure has substantially the same configuration as the trigger switch of the first example described above as shown in FIGS. A contact driving member 13 that accommodates a contact member 12 having a movable contact at an appropriate position and slides on the contact member 12 to perform a contact operation, and a trigger in which an operation shaft 22 is integrally formed with the contact driving member 13 21.

  The contact drive member 13 is formed in a substantially rectangular parallelepiped shape, and a wall portion 14 for associating with the tip end portion 23 of the operation shaft 22 is formed on the front side of the contact drive member 13, and is projected at a substantially central position of the wall portion 14. A return spring engagement portion 15 that includes a guide convex portion 19 and that penetrates the ceiling side inside the wall portion 14 into a semicylindrical shape and engages and supports the return spring 27 is provided, and the lateral side of the return spring engagement portion 15 is provided. Is provided with a slide speed control unit 17 having a slide spring 28 for sliding on a slide resistor 26 provided on a control board 25 for controlling the speed. The contact sliding part 16 formed by the oscilloscope 18 sliding on the surface of the plate part provided with the movable contact is provided.

  The guide convex portion 19 is formed to project at a substantially central position of the wall portion 14, and its cylindrical diameter is a size that can be accommodated in a hollow guide hole 29 formed in the operation shaft 22, The ring engagement groove 20 is formed so as to have a narrow diameter with a predetermined width from the distal end to the base, and the E-ring 31 is fitted in a cantilever manner on the base side.

  The contact sliding portion 16 includes an oscilloscope 18 which is shifted in parallel to the opposite side of the return spring engaging portion 15 and is given elastic force by a spring, and the distal end portion of the oscilloscope 18 has a movable contact at the end portion. It has a structure that slides in contact with the surface of the provided plate portion.

  The return spring engaging portion 15 is configured to engage the return spring 27, engage one end portion of the return spring 27 with the wall portion of the case, and elastically bias the contact driving member 13 itself toward the trigger 21. It has become.

As described above, the trigger 21 is integrally formed with the operating shaft 22, and a ring mounting groove 24 for securing the E-ring 31 is provided on the distal end side of the operating shaft 22, and a hollow guide is formed from the distal end side. A hole 29 is formed, and the guide hole 29 is formed in a size that allows the guide convex portion 19 to be loosely fitted.
The distal end portion 23 of the operation shaft 22 has a structure in which the guide convex portion 19 is fitted in the guide hole 29 and abuts against the surface of the wall portion 14.

  Thus, the contact driving member 13 is brought into contact with the movable contact so as to be slidable, and the guide convex portion 19 provided on the wall portion 14 of the contact driving member 13 is provided on the distal end portion 23 of the operation shaft 22. The end portion 23 of the operation shaft 22 is brought into contact with the wall portion 14 by loosely fitting into the hole 29. Then, the contact drive member 13 itself is biased in the direction of the trigger 21 by the return spring 27 engaged with the contact drive member 13 and the return spring engaging portion 15, so that the wall portion 14 and the tip of the operation shaft 22 are moved. The contact with the portion 23 maintains a state in which the guide convex portion 19 is loosely fitted in the guide hole 29 at all times.

  When the trigger 21 is pulled in this state, the guide convex portion 19 is loosely fitted in the guide hole 29 provided in the distal end portion 23 of the operation shaft 22 and the distal end portion 23 of the operation shaft 22 contacts the wall portion 14. In this state, the contact driving member 13 slides and slides in the back direction of the case 11 by being pulled against the return spring 27.

  When sliding and sliding, the contact sliding portion 16 slides on the plate portion of the movable contact to turn on the contact, and the slide spring 28 of the slide speed control portion 17 is moved to the slide resistor 26 of the control board 25. The speed is controlled by sliding on the top.

  In this state, when the lock button 32 is turned on, the pulled-in state is maintained, and further, by pushing the trigger 21, the lock state by the lock button 32 is released, and the return force of the return spring 27 returns the trigger 21 to the original state. Pushed back to the state.

  A contact drive member that slides with the sliding operation of the trigger, and provides a trigger switch with a structure that reduces the impact on the operation shaft related to the contact drive member even if an impact load from any direction is applied to the trigger To do.

DESCRIPTION OF SYMBOLS 11 Case 12 Contact member 13 Contact drive member 14 Wall part 15 Return spring engaging part 16 Contact sliding part 17 Slide speed control part 18 Oshibo 19 Guide convex part 20 Ring engaging groove 21 Trigger 22 Operation shaft 23 Tip part 24 Ring attachment Groove 25 Control board 26 Slide resistor 27 Return spring 28 Slide spring 29 Guide hole 31 E ring 32 Lock button

Claims (3)

A fixed contact and a movable contact provided in the case so as to be able to contact and separate; and
A contact driving member that is slidably accommodated in the case and drives the movable contact;
An operating shaft for engaging the contact driving member is provided on a trigger operated by a user,
The trigger switch according to claim 1, wherein a tip portion of the operation shaft is in contact with a wall portion of the end portion of the contact driving member.   The trigger switch according to claim 1, wherein an engagement portion that engages in a concave-convex relationship is provided at a location where the wall portion abuts.   The trigger switch according to claim 2, wherein the engaging portion is configured to be locked by a ring of another member.

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