JP2011218521A - Trigger switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a trigger switch which can eliminate a burr of a lock button by avoiding press-fit assembling when assembling the lock button, and can eliminate defective trigger lock, and is simplified so as to assemble the lock button without using a tool.SOLUTION: The trigger switch includes a switch body 12 having a lock button 11 for locking the push-in state of an operation lever 15 on its side face, and the operation lever provided with a guide rail engaged with a guide groove formed through the lower side of a lock button fitting part 21 for fitting the lock button to guide the engagement state of the lock button. A locking flange of the lock button is set to the shape of a lock button insertion hole and inserted in the lock button insertion hole, and the inserted locking flange makes an edge in the longitudinal direction of the locking flange engaged with an outlet end of the lock button insertion hole.

Description

  The present invention relates to a trigger switch, and more particularly, to an improvement of a lock button that locks a state in which an operation lever provided in a switch used for a power tool switch is retracted, particularly when assembling a lock button. The present invention relates to a structure of a lock button that simplifies assembly without requiring a tool.

  As shown in FIGS. 13 and 14, the switch for a power tool in the prior art is provided with a switch body 112 having a lock button 111 on a side surface and a button lock guide hole 114 for maintaining the lock state of the lock button 111. An operation lever 115 including a guide rail 113 is provided.

  The switch body 112 houses therein a rotation speed control board for controlling the rotation speed of a motor (not shown) and a switch mechanism for changing / adjusting the rotation speed, and a guide rail on the side surface along the sliding direction of the operation lever 115. A guide groove 116 formed by notching a predetermined width to slidably receive 113 is provided, and a lock button 111 formed at a substantially central position of the guide groove 116 and straddling the groove is engaged and locked. The lock button fitting portion 121 is provided.

  The operation lever 115 is always urged away from the switch body by a spring (not shown) attached to a switch mechanism housed in the switch body 112. When the operation lever 115 is pushed, the motor starts. Further, the rotation speed is changed by pushing, and when the pressing is released, the motor is stopped by returning to the position before the pressing by the biasing force of the spring.

Further, by pushing the operating lever 115 to the maximum extent, a so-called full stroke state is obtained, and at this time, the full stroke state can be maintained by pressing the lock button 111. To release the full stroke state, the lock button 111 is released by pushing the operation lever 115, and the full stroke state is released.
Such an operation lever 115 is provided with a guide rail 113 formed so as to protrude in a flat plate shape from one side piece of the operation lever 115. The guide rail 113 engages with a guide groove 116 provided in the switch body 112, and has a structure in which a button lock guide hole 114 formed in a substantially perfect circle shape is provided in a substantially central position formed in a flat plate shape. ing.

  The button lock guide hole 114 is engaged with a retaining collar portion 124 provided at the tip of the central knob 123 of the lock button 111, and is formed in a perfect circle shape as a whole, and tapers to the inner diameter of the hole on the tip side. It has a structure with.

  As shown in FIGS. 14, 15, and 16, the lock button 111 is formed in an umbrella shape, a push button portion 122 formed in a cylindrical shape with a rounded periphery, and a center position on the back side of the push button portion 122. A central knob 123 formed so as to protrude from the central knob 123, a distal end of the central knob 123 is provided with a retaining hook part 124 formed in a hook shape for locking the lock button 111, and a spring 125 is engaged with the back side of the push button part 122. The structure is provided with a spring engaging recess 126 having a space for joining.

  The center knob 123 and the retaining rod portion 124 are formed in a perfect circle shape. In particular, the retaining rod portion 124 is structured to be fitted into the button insertion hole 131 of the lock button fitting portion 121 provided in the switch body 112 by press fitting. ing.

  As shown in FIGS. 14 and 17, the lock button fitting portion 121 is disposed at a substantially central position of the guide groove 116 and is formed in a cylindrical shape as a whole so that the cylindrical lock button 111 can be engaged. An outer cylinder 127 that is an outer cylinder, an inner cylinder 128 that is formed to have a diameter smaller than that of the outer cylinder 127, and a space between the outer cylinder 127 and the inner cylinder 128 that serves as a spring engaging recess 129 that engages a spring; The inner side of the inner cylinder 128 forms a button insertion hole 131 through which the center knob 123 and the retaining collar portion 124 of the lock button 111 are inserted.

  The button insertion hole 131 has a structure in which a press-fitting member 118 that protrudes inwardly is provided. When the lock button 111 is attached to the button insertion hole 131, it is engaged by press-fitting and pushing the retaining collar portion 124. Lock.

  The press-fitting member 118 is formed so as to protrude inward from the inner diameter of the inner cylinder 128. When the retaining collar portion 124 of the lock button 111 is inserted by press-fitting, the retaining collar portion 124 is then engaged with the press-fitting member 118. It functions as a stopper.

  In the assembly of the lock button 111 and the lock button fitting portion 121 having such a structure, first, the spring 125 is inserted into the spring engagement recess portion 129 of the lock button fitting portion 121, and the spring engagement recess portion 126 of the lock button 111 is inserted. The spring 125 is engaged, and the retaining collar portion 124 on the distal end side of the center knob 123 of the lock button 111 is inserted into the button insertion hole 131 of the lock button fitting portion 121 and press-fitted into the press-fit member 118 to insert the lock button 111. assemble. The retaining collar portion 124 inserted by press-fitting is retained by the press-fitting member 118.

  18, 19, and 20 show a so-called lock-off state in which the lock button 111 is assembled and not locked, and the operation lever 115 is a spring housed in the switch body 112. The guide rail 113 is accommodated in the guide groove 116 and the button lock guide hole 114 is opposed to the position away from the position of the lock button 111. Therefore, even if the lock button 111 is pressed, it is blocked on the surface of the guide rail 113 and cannot be locked.

21, 22, and 23 show a so-called lock-on state in which the lock button 111 is assembled and locked. When the operation lever 115 is pushed in, the button lock guide hole is shown. When the locking button 111 is pressed in this state, the locking collar part 124 enters the button lock guide hole 114 and the button locks on the side surface of the locking collar part 124. The opening end portion of the guide hole 114 comes into contact, and the retaining rod portion 124 engages and locks with the end portion of the button lock guide hole 114 to maintain the state.
This lock is achieved by further pulling the locked operation lever 115 a little so that the retaining collar portion 124 that is locked in the button lock guide hole 114 is released and the lock button 111 is released by the biasing force of the spring 125. The locking state can be easily removed by moving the retaining collar portion 124 outward from the button lock guide hole 114.

JP 2008-62346 A

However, in the lock mechanism described in the prior art, the lock button has a structure that fits into the lock button fitting portion of the switch body by press-fitting, and the lock catch such as squeezing becomes worse when press-fitted. There is a problem of trigger lock failure.
Further, in assembly, it is necessary to press-fit the lock button from right above, so that it is necessary to press-fit using a jig, and there is a problem that it takes time to assemble by using the jig.

  Therefore, it is possible to avoid the assembly by the press-fitting method when assembling the lock button, and to make the structure to be rotated after being inserted from the press-fitting method, to eliminate the lock button twist, to eliminate the trigger lock failure, and to assemble without using a jig. Thus, there is a problem that must be solved to simplify.

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

(1) The trigger switch
On the side, a switch body with a lock button that locks the push-in state of the control lever,
An operation lever provided with a guide rail that engages with a guide groove formed by penetrating the lower side of the lock button fitting portion for attaching the lock button and guides the engagement state of the lock button;
With
The lock button includes a stopper collar formed in a U-shaped ellipse at the tip extending from the central axis,
The lock button fitting portion includes a lock button insertion hole formed in a U-shaped oval shape into which the retaining collar portion is inserted.
The lock button insertion hole is inserted into the lock button insertion hole in accordance with the shape of the lock button insertion hole, and the insertion hole is rotated to rotate, so that the lock button insertion hole is rotated at the outlet end of the lock button insertion hole. It is engaging the edge of the length direction.
(2) The trigger switch according to (1), wherein the lock button insertion hole is arranged in a length direction of an ellipse in a direction crossing the guide groove.
(3) The guide rail is provided with a guide portion for sandwiching an end portion in a short direction of a retaining rod portion of a lock button mounted in the lock button insertion hole. Trigger switch.

In the trigger switch according to the present invention, the shape of the retaining collar provided at the tip of the lock button is formed into a U-shaped ellipse, and the lock button insertion hole for inserting the retaining collar is also formed in the same shape. Since the locking collar is loosely fitted into the lock button insertion hole and inserted and rotated to prevent it from being pulled, no excessive stress is generated during assembly, eliminating any damage during assembly. be able to.
Further, since an operation of accurately pushing in at the time of assembly is not required, the assembly can be performed without the need for a special jig, and the assembly can be simplified and the assembly time can be shortened.

1 is an overall perspective view of a trigger switch according to the present invention. It is the perspective view which decomposed | disassembled and showed the component of the trigger switch same as the above. It is the perspective view which looked at the component of the trigger switch from the back side. FIG. 2 is an overall perspective view of the lock button. It is the top view seen from the bottom face of the lock button. It is a top view of the lock button fitting part provided in the switch main body similarly. FIG. 6 is a front view of the trigger switch when in a lock-off state. FIG. 8 is a cross-sectional view taken along a line AA in FIG. 7 and a cross-sectional view partially enlarged. FIG. 8 is a cross-sectional view taken along a line BB in FIG. 7 and a cross-sectional view partially enlarged. It is a front view at the time of a lock on state of a trigger switch. FIG. 11 is a cross-sectional view taken along a line AA in FIG. It is sectional drawing of the cross section BB in FIG. 10, and sectional drawing shown partially enlarged. It is the whole trigger switch perspective view in a prior art. It is the perspective view which decomposed | disassembled and showed the component of the trigger switch same as the above. FIG. 2 is an overall perspective view of the lock button. It is the top view seen from the bottom face of the lock button. It is a top view of the lock button fitting part provided in the switch main body similarly. FIG. 6 is a front view of the trigger switch when in a lock-off state. FIG. 19 is a cross-sectional view taken along a line AA in FIG. 18 and a partially enlarged cross-sectional view. FIG. 19 is a cross-sectional view taken along the line BB in FIG. It is a front view at the time of a lock on state of a trigger switch. FIG. 22 is a cross-sectional view taken along a line AA in FIG. 21 and a partially enlarged cross-sectional view. FIG. 22 is a cross-sectional view taken along a line BB in FIG. 21 and a partially enlarged cross-sectional view.

  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 3, the trigger switch according to the present invention is a guide provided with a switch body 12 having a lock button 11 on a side surface and a button lock guide hole 14 for maintaining the lock button 11 in a locked state. The operation lever 15 including the rail 13 is provided.

  The switch body 12 houses therein a rotation speed control board for controlling the rotation speed of a motor (not shown) and a switch mechanism for changing / adjusting the rotation speed, and the operation lever on the side surface along the sliding direction of the operation lever 15. A guide groove 16 formed by notching a predetermined width for slidably accommodating the 15 guide rails 13 is provided, and the lock button 11 is formed so as to straddle the guide groove 16 at a substantially central position of the guide groove 16. It is the structure provided with the lock button fitting part 21 which engages and locks.

  The operation lever 15 is always urged in a direction away from the switch body 12 by a spring (not shown) attached to a switch mechanism housed in the switch body 12, and the motor starts when the operation lever 15 is pushed. Further, the rotation speed is changed by pushing, and when the pressing is released, the motor is stopped by returning to the position before the pressing by the urging force of the spring.

  Further, by pushing the operating lever 15 to the maximum extent, a so-called full stroke state is obtained, and at this time, the full stroke state can be maintained by pressing the lock button 11. To release the full stroke state, the lock button 11 is released by pushing the operating lever 15 and the full stroke state is released.

Such an operation lever 15 is provided with a guide rail 13 formed so as to protrude in a flat plate shape from one side piece of the operation lever 15. This guide rail 13 engages with a guide groove 16 provided in the switch body 12, and has a structure in which a button lock guide hole 14 formed in a substantially elliptical shape is provided in a substantially central position formed in a flat plate shape. Yes.
Further, the guide rail 13 includes button guide portions 17a and 17b formed in a convex shape for guiding the lock button 11 attached to the lock button fitting portion 21 so as not to come off.

  The button lock guide hole 14 engages with a retaining collar provided at the tip of the central knob of the lock button 11 and is formed in an oval shape as a whole, and the inner diameter of the hole on the tip side is tapered. It has a structure.

The button guide portions 17 a and 17 b are provided so that both end sides of the guide rail 13 are formed in a line shape of a convex portion, and the width between the button guide portions provided in the line shape is short of the retaining collar portion 24 of the lock button 11. The width is set to allow the length in the direction and not allow the length in the longitudinal direction.
This is because when the lock button 11 is fitted to the lock button fitting portion 21, the lock button 11 is rotated by approximately 90 degrees and is pulled out and engaged with the outlet end of the insertion hole by the retaining collar 24. In addition, the lock button 11 is prevented from being pulled out by guiding the short side surface so as not to rotate.

  As shown in FIGS. 2, 3, 4, and 5, the lock button 11 is formed in an umbrella shape, a push button portion 22 formed in a cylindrical shape with a rounded periphery, and a push button portion 22. The center knob 23 is formed so as to protrude from the center position on the back side, and is formed in a bowl shape for rotating and locking the lock button 11 at the tip of the center knob 23 and formed in a U-shaped oval shape. And a spring engaging recess 26 having a space for engaging the spring 25 on the back side of the push button portion 22.

The central knob 23 is formed in a cylindrical shape, and the retaining collar 24 provided at the end portion connected to the central knob 23 is formed in a U-shaped ellipse having a predetermined thickness. The shortest portion of the retaining collar portion 24 formed in the U-shaped oval shape engages with the button guide portions 17a and 17b of the guide rail 13 to contribute to the retaining, and the button lock guide hole 14 of the guide rail 13 Is engaged to lock the operating lever 15.
That is, the lock button 11 is rotated 90 degrees after inserting the retaining collar into the button insertion hole formed in the ellipse of the U-shape of the lock button fitting portion 21 provided in the switch body 12 and inserting it. By doing so, it is structured to engage with the outlet end of the button insertion hole.

  As shown in FIGS. 2 and 6, the lock button fitting portion 21 is disposed at a substantially central position of the guide groove 16 and is formed in a cylindrical shape as a whole so that the cylindrical lock button 11 can be engaged. An outer cylinder 27 that is an outer cylinder, an inner cylinder 28 that has a smaller diameter than the outer cylinder 27, and a space between the outer cylinder 27 and the inner cylinder 28 is a spring engagement recess 29 that engages the spring 25. The inside of the inner cylinder 28 forms a button insertion hole 31 through which the central knob 23 and the retaining collar 24 of the lock button 11 are inserted.

The button insertion hole 31 is formed in a U-shaped ellipse having the same shape that can be loosely fitted to the retaining collar portion 24 of the lock button 11, and the length direction of the ellipse crosses the guide groove, that is, orthogonal It is formed in the direction.
When attaching the lock button 11 to the button insertion hole 31, the retaining collar 24 formed in a U-shaped oval shape is loosely fitted to the button insertion hole 31, and then fitted to the right or left direction. The lock button 11 is engaged and locked when the end edge in the longitudinal direction of the retaining collar 24 is engaged with the outlet end of the button insertion hole 31.

  In the assembly of the lock button 11 and the lock button fitting portion 21 having such a structure, first, the spring 25 is inserted into the spring engagement concave portion 29 of the lock button fitting portion 21, and the spring engagement concave portion 26 of the lock button 11 is inserted. The spring 25 is engaged, and the retaining rod 24 on the distal end side of the center knob 23 of the lock button 11 is inserted into the button insertion hole 31 formed in the U-shaped oval shape of the lock fitting portion 21 and inserted. After that, the lock button 11 is assembled by rotating 90 degrees right or left. The retaining collar 24 inserted into the button insertion hole 31 is pivoted so that the longest part formed in a U-shaped oval is engaged with the outlet end of the shortest part of the button insertion hole 31. The

7, 8, and 9 show a so-called lock-off state in which the lock button 11 is assembled and not locked, and the operation lever 15 is a spring housed in the switch body 12. The guide rail 13 is accommodated in the guide groove 16 and the button lock guide hole 14 is opposed to the position away from the position of the lock button 11. Therefore, even if the lock button 11 is pressed, it is blocked by the surface of the guide rail 13 and cannot be locked.
Further, when the lock button 11 is inserted into the button insertion hole 31, the retaining collar 24 is retained at the button insertion hole 31 at the longest portion formed in a U-shaped oval shape, and the button guide of the guide rail 13 The lock button 11 cannot be rotated by sandwiching both sides of the retaining collar 24 with the parts 17a and 17b.

10, 11, and 12 show a so-called lock-on state in which the lock button 11 is assembled and locked. When the operation lever 15 is pushed in, the button lock guide hole is shown. 14, when the lock button 11 is pressed, the lock button 11 is pushed into the button lock guide hole 14, and the lock button 24 is locked to the side surface of the lock rod 24. The opening end portion of the guide hole 14 comes into contact, and the retaining rod portion 24 engages and locks with the end portion of the button lock guide hole 14 to maintain the state.
This lock is achieved by pulling the locked operation lever 15 a little further, so that the retaining collar 24 that is locked in the button lock guide hole 14 is released, and the lock button 11 is released in the direction in which the lock button 11 is detached by the biasing force of the spring. The locked state can be easily removed by moving the collar portion 24 outwardly away from the button lock guide hole 14.

  Avoid the assembly by press-fitting when assembling the lock button so that it can be rotated after being inserted from the press-fitting method so that the lock button will not be twisted, the trigger lock failure will be eliminated, and it can be assembled without using jigs Provide a simplified trigger switch.

DESCRIPTION OF SYMBOLS 11 Lock button 12 Switch main body 13 Guide rail 14 Button lock guide hole 15 Operation lever 16 Guide groove 17a Button guide part 17b Button guide part 21 Lock button fitting part 22 Push button part 23 Center knob 24 Detent guard part 25 Spring 26 Spring engagement Joint recess 27 Outer cylinder 28 Inner cylinder 29 Spring engagement recess 31 Button insertion hole 111 Lock button 112 Switch body 113 Guide rail 114 Button lock guide hole 115 Operation lever 116 Guide groove 118 Press-fit member 121 Lock button fitting part 122 Push button part 123 Center knob 124 Detachment flange 125 Spring 126 Spring engagement recess 127 Outer cylinder 128 Inner cylinder 129 Spring engagement recess 131 Button insertion hole

Claims (3)

On the side, a switch body with a lock button that locks the push-in state of the control lever,
An operation lever provided with a guide rail that engages with a guide groove formed by penetrating the lower side of the lock button fitting portion for attaching the lock button and guides the engagement state of the lock button;
With
The lock button includes a stopper collar formed in a U-shaped ellipse at the tip extending from the central axis,
The lock button fitting portion includes a lock button insertion hole formed in a U-shaped oval shape into which the retaining collar portion is inserted.
The lock button insertion hole is inserted into the lock button insertion hole in accordance with the shape of the lock button insertion hole, and the insertion hole is rotated to rotate, so that the lock button insertion hole is rotated at the outlet end of the lock button insertion hole. The trigger switch characterized by engaging the edge of the length direction.   2. The trigger switch according to claim 1, wherein the lock button insertion hole is arranged in a direction of an ellipse in a direction crossing the guide groove.   2. The trigger switch according to claim 1, wherein the guide rail is provided with a guide portion for sandwiching an end portion in a short direction of a lock-out preventing portion of a lock button mounted in the lock button insertion hole. .

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