JP3036055B2 - Trigger switch - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a trigger switch for driving and stopping, for example, a manual power tool, and more specifically, does not perform a reverse operation when the power tool is in a driving or stopping state. The present invention relates to a trigger switch provided with a locking mechanism for locking as described above.

<Prior Art and Problems> Conventionally, as a lock mechanism of this type of switch, for example, the one shown in FIG. 7 is known. (1-137029
As shown in FIG. 1, a trigger member 2 for opening and closing a switch mechanism (not shown) housed in the housing main body 1 is held in the housing main body 1 so as to be able to advance and retreat.
A plate-shaped protruding piece 4 is integrally provided at one end of the cover 3 attached to the housing 3, and the housing body 1 and the cover 3 constitute a housing 21.

An operation button 5 is rotatably mounted on the support shaft 6 fixed to the protruding piece 4, and a tip 2 a of the trigger member 2 is connected to the operation button 5 via a support shaft 7, When the operation button 5 is pushed around the support shaft 6 and rotated from the solid line state to the state shown by the virtual line, the tip 2a of the trigger member 2 advances in the direction of arrow a, and the inside of the housing body 1 is moved forward. Turn ON the switch mechanism. When the pressing force of the operation button 5 is released, the switch mechanism is retracted in the direction of the arrow b by the spring force of a return spring (not shown) to hold the switch mechanism in the OFF state.

However, a lock plate 10 formed with an insertion hole 9 for the lock pin 8 is fixed to the inner side surface of the operation button 5. The insertion hole 9 has a large diameter portion 9 a through which the large diameter portion 8 a of the lock pin 8 is inserted. A small-diameter portion 9b into which the small-diameter portion 8b of the locking pin 8 is inserted is formed. In the state shown in the drawing, the large-diameter portion 8a of the locking pin 8 is formed so as not to enter the small-diameter portion 9b of the insertion hole 9. Operation button 5
Cannot be pushed around the support shaft 6. That is,
The advancement of the trigger member 2 is prevented to keep it in an off-lock state, and for example, the switch mechanism is kept in an OFF state.

On the other hand, the lock pin 8 is axially moved in the axial direction (the direction orthogonal to the paper surface), and the small diameter portion 8b is made to correspond to the position where the small diameter portion 9b of the insertion hole 9 can enter. When pushed around the support shaft 6, the operation button 5 can be rotated around the support shaft 6 while the small-diameter portion 8b of the locking pin 8 enters the small-diameter portion 9b of the insertion hole 9. The trigger member 2 moves forward to turn on the switch mechanism.

However, according to the above configuration, in order to maintain the ON operation of the switch mechanism, the operation button 5 must be kept pressed, so that the operator is significantly fatigued. for that reason,
It is known that an on-lock mechanism is provided in place of the off-lock mechanism in order to hold the operation button 5 in the locked state at the depressed position and to maintain the switch mechanism in the on-lock state.

However, those without the above-mentioned off-lock mechanism are:
For example, when the manual power tool is in a stopped state, there is a possibility that it is accidentally driven by mistake.

Conventionally, as means for improving this, a small diameter portion, a medium diameter portion, and a large diameter portion are formed coaxially in a lock pin for off-locking and on-locking the rotation of the operation button so as to extend in the axial direction. A shaft for forming a long hole-shaped insertion hole through which the small-diameter portion and the medium-diameter portion are individually inserted into the first lock plate fixed to the operation button, and for inserting and locking the large-diameter portion of the lock pin. A hole is formed in the second lock plate fixed to the operation button, and the off-lock pin is constantly biased toward the lock button fixed to one end of the off-lock pin, thereby forming a medium-diameter portion of the off-lock pin. Is inserted into the middle diameter portion of the elongated hole of the first lock plate and is always disposed in the small diameter portion, thereby locking and holding the operation button at the initial position of the rotation, thereby forming the off-lock mechanism. To configure Then, the lock button is pressed against the spring force of the spring member to dispose the small-diameter portion of the off-lock pin in the small-diameter portion of the long hole-shaped insertion hole of the lock plate, and allows the operation button to rotate. Then, the switch mechanism is turned on, and furthermore, the lock button is pressed to insert and lock the large-diameter portion of the lock pin into a shaft hole formed in the second lock plate. There is known a trigger switch which has an on-lock mechanism for holding the lock at the end position of the rotation (actual opening 63-1672).
No. 3).

However, according to the above configuration, the lock pin has a small diameter portion,
The middle diameter portion and the large diameter portion must extend in the axial direction and be formed integrally, have a long axial length, not only increase the size of the off-lock and on-lock mechanisms, but also lock the lock pin. Therefore, there are problems that the first and second lock plates are required, the number of parts is increased, and the manufacturing and assembling work is extremely troublesome.

<Object of the Invention> The present invention has been made in order to solve the above-mentioned problems, and provides a trigger switch in which the off-lock and on-lock mechanisms are reduced in size, the number of parts is reduced, and the manufacturing and assembling operation is easy. With the goal.

<Structure and Effect of the Invention> The trigger switch according to the present invention is provided with an opening / closing trigger member of a switch mechanism housed in a housing so as to be able to advance and retreat, and is rotatable via a support shaft on a protruding piece projecting from the housing. The trigger member is connected to an operation button having a substantially U-shaped cross section mounted on the switch, and the operation button is rotated around the support shaft against a spring force. While turning the function ON and OFF,
In a trigger switch including a lock mechanism for off-locking and on-locking the rotation of the operation button, the lock mechanism allows rotation of the operation button and has an axial direction substantially parallel to an axis of the support shaft. An off-lock pin that is axially movably inserted into the protruding piece and extends coaxially with the large-diameter portion and the small-diameter portion in the axial direction, and a lock plate fixed to one side of the operation button; A large-diameter portion formed in the lock plate and through which a large-diameter portion of the off-lock pin is inserted in a direction perpendicular to the plate surface of the lock plate at a rotation position of the operation button for turning off the switch mechanism. The off-lock pin is formed in an arc shape in the circumferential direction around the support shaft so as to prevent the large-diameter portion of the off-lock pin from being inserted and to turn on the switch mechanism. A long hole-shaped insertion hole having a small diameter portion through which the small diameter portion of the off-lock pin is inserted at the rotation position of the operation button; a lock button fixed to one end of the small diameter portion of the off-lock pin; A spring member for constantly urging a spring force to the off-lock pin toward the lock button; and a shaft member formed in a shaft hole formed in the projecting piece of the housing so as to be axially movable. An on-lock member that is fitted and connected to the other end of the large-diameter portion so as to be able to axially move a predetermined stroke, and an operation button that is formed on the other side of the operation button and that turns on the switch mechanism. A shaft hole for inserting the other end of the large-diameter portion of the on-lock member at the rotation position to the outside of the other side portion of the operation button, wherein the off-lock pin is locked by the spring force of the spring member. Move to the side and hold An off-lock mechanism that locks the rotation of the operation button to an initial position by always disposing a large-diameter portion of the off-lock pin in a large-diameter portion of the elongated hole of the lock plate; A button is pressed against the spring force of the spring member, a small-diameter portion of the off-lock pin is arranged at a small-diameter portion in the long hole-shaped insertion hole of the lock plate, and the operation button is positioned around the support shaft. The switch mechanism is turned ON by performing a fixed rotation, the lock button is further pressed at the ON operation position of the switch mechanism, and the other end of the ON lock member is moved in conjunction with the axial movement of the OFF lock pin. The operation button is inserted through a shaft hole formed on the other side of the operation button so as to protrude outward from the operation button, and the operation button is pivotally returned around the support shaft by a predetermined amount to push the lock button. Is released, the stopper portion protruding from the other end of the on-lock member is locked to the outer peripheral edge of the shaft hole in cooperation with the spring force of the spring member so as to be locked and held. And a mechanism.

According to the above configuration, the small-diameter portion and the large-diameter portion are formed on the off-lock pin to constitute an off-lock mechanism for the operation button, and the on-lock mechanism moves the shaft at a predetermined stroke to the other end of the off-lock pin. Since it is constituted by an on-lock member mounted so as to be possible, the shaft length of the off-lock pin can be reduced to make the off-lock and on-lock mechanism compact, and the on-lock member is locked to the operation button. Thus, the number of parts can be reduced by eliminating the lock plate of the on-lock member, and the manufacturing and assembling operation can be facilitated.

<Description of Embodiment> An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a partially cutaway side view showing an example of a trigger switch according to the present invention.

6, the same parts as those in FIG. 6 are denoted by the same reference numerals, and detailed description thereof will be omitted.

At one end of the cover 3 mounted on the housing main body 1, a plate-shaped protruding piece 4 is integrally provided, and an operation button 5 is rotatably mounted on a support shaft 6 fixed to the protruding piece 4. ing. As shown in FIG. 2, the operation button 5 is formed in a substantially U-shape in cross section. On both sides 5a and 5b, a shaft hole 5c is formed on the front side thereof. Shaft hole 4a
Are formed, and the support shaft 6 of the operation button 5 is inserted into each of the shaft holes 4a and 5c. A return coil spring 15 is installed in a compressed state between the operation button 5 and each rear upper portion of the protruding piece 4, and is returned in a pushing direction c for pushing the operation button 5 around the support shaft 6. The spring force is constantly applied in the direction d.

In addition, a shaft hole 5d is formed at a lower portion on the front side of both sides 5a, 5b of the operation button 5, and a shaft hole 2b is formed at a tip 2a of the trigger member 2, and the shaft hole 2b, 5d is supported. The shaft 7 is inserted, and the tip 2 a of the trigger member 2 is connected to the operation button 5 via the support shaft 7.

A lock plate 10 is fixed to the inner surface of the operation button 5 as shown in FIG. 3, and a large-diameter portion 8a of the off-lock pin 8 is inserted into an insertion hole 9 of the off-lock pin 8 formed in the lock plate 10. A large-diameter portion 9a and a small-diameter portion 9b of a long hole portion through which the small-diameter portion 8b of the off-lock pin 8 is inserted are formed, and one side of the operation button 5 corresponding to the insertion hole 9 of the locking plate 10. An elongated through-hole 5e is formed in the front middle portion of 5a.

The off-lock pin 8 has a shaft hole formed in the projecting piece 4.
A lock button 11 is fixed to one end 8c of the lock button 11 so as to be axially movably inserted into 4b. A compression coil spring 12 is wound around the off-lock pin 8, and both ends thereof are brought into contact with the lock button 11 and the lock plate 10, respectively, and by the compression spring force, as shown in FIG. The large diameter portion 8a is always arranged at a position where it cannot enter the small diameter portion 9b of the insertion hole 9. As a result, the operation button 5 cannot be pushed around the support shaft 6, so that the trigger member 2 is prevented from moving forward and is kept in the off-lock state, and the switch mechanism is kept in the OFF state.

A cylindrical on-lock member 13 is axially movable at the other end 8d of the off-lock pin 8, and a through hole 13b at the other end 8d is formed in a bearing 13a protruding inside.
An on-lock member 13 is attached to the other end 8d of the off-lock pin 8.
Are fixed. The on-lock member 13 has a storage recess 13c in which the large-diameter portion 8a of the off-lock pin 8 is stored, and is inserted through a shaft hole 4b formed in the protruding piece 4 so as to be axially movable. The other end has a stopper portion 13d which comes into contact with a step portion 4c formed in the shaft hole 4b.

Further, a shaft hole 5f through which the on-lock member 13 is inserted is formed at the front upper portion of the other side 5b of the operation button 5.

 Next, the operation of the above configuration will be described.

In the non-pressed state of the lock button 11, as shown in FIG. 3, the large diameter portion 8a of the lock pin 8 is located in the insertion hole 9 and formed so as not to enter the small diameter portion 9b. The operation button 5 cannot be pushed around the support shaft 6. That is, the advancement of the trigger member 2 is prevented, and the off-state in which the switch mechanism is turned off can be maintained. Thus, an off-lock mechanism A is configured.

On the other hand, when the lock pin 8 is axially moved in the pushing direction e, as shown in FIG. 4, the large diameter portion 8a of the lock pin 8 is axially moved and stored in the storage recess 13c of the on-lock member 13, The small diameter portion 8b can correspond to a position where it can enter the small diameter portion 9b of the insertion hole 9. When the operation button 5 is pushed around the support shaft 6 in this state, the operation button 5 is turned around the support shaft 6 while the small-diameter portion 8b of the locking pin 8 enters the small-diameter portion 9b of the insertion hole 9. Therefore, the trigger member 2 moves forward, and the switch mechanism can be turned ON.

In a state where the operation button 5 is rotated around the support shaft 6 to a position where the switch mechanism is turned on,
When the lock pin 8 is axially moved in the pushing direction e, the fifth
As shown in the figure, the large-diameter portion 8a of the lock pin 8 abuts on the bearing 13a of the on-lock member 13 and integrally moves axially,
The other end of the on-lock member 13 is inserted through a shaft hole 5f formed in the other side portion 5b of the operation button 5 in conjunction with the axial movement of the off-lock pin 8 to move the operation button 5 outward. When the operation button 5 is rotated around the support shaft 6 by a predetermined amount and released, and the pressing of the lock button 11 is released, a stopper portion protruding from the other end of the on-lock member 13 is protruded. 13d is cooperated with the spring force of the coil spring 12 to be locked and held by the outer peripheral edge of the shaft hole 5f, as shown in FIG. 6, to keep the ON operation of the switch mechanism in an on-lock state. Can be held. Thus, an on-lock mechanism B is configured.

According to the above configuration, both off-lock and on-lock mechanisms are provided.
Since the switches A and B are provided, it is possible to effectively prevent the switch mechanism from being inadvertently turned ON by the off-lock mechanism A, and to minimize the operator's fatigue by the on-lock mechanism B.

In addition, since the two mechanisms A and B are coaxially assembled so as to be axially movable, the initial purpose can be achieved with a small and simple configuration and operation.

In particular, according to the above-described configuration, the large-diameter portion 8a and the small-diameter portion 8 are formed on the off-lock pin 8 to constitute the off-lock mechanism A of the operation button 5, and the on-lock mechanism B is provided in addition to the off-lock pin 8. Since it is constituted by the on-lock member 13 attached to the end so as to be able to move the shaft by a predetermined stroke,
By making the shaft length of the off-lock pin 8 short, the off-lock and on-lock mechanisms A and B can be miniaturized, and by locking the on-lock member 13 to the operation button 5, the on-lock member 13 By eliminating the lock plate, the number of parts can be reduced, and the manufacturing and assembling work can be facilitated.

[Brief description of the drawings]

FIG. 1 is a partially cutaway side view showing an example of a trigger switch according to the present invention, FIG. 2 is an exploded perspective view showing a configuration of a main part of the switch, and FIGS. 3 to 6 are main parts of the switch. FIG. 7 is a partially cutaway side view showing an example of a conventional trigger switch. 2 ... trigger member, 4 ... projecting piece, 5 ... operation button, 5a
…… one side of operation button, 5b …… other side of operation button, 5f
…… Shaft hole, 6… Support shaft, 8… Off-lock pin, 8a…
Large-diameter portion of off-lock pin, 8b: small-diameter portion of off-lock pin, 9: long-diameter insertion hole, 9a: large-diameter portion of long-hole insertion hole, 9b: small-diameter of long-hole insertion hole Part, 10: Lock plate, 11: Lock button, 12: Spring member (compression coil spring), 13: On-lock member, 13c: Storage recess, 13d
... Stopper portion, A: Off-lock mechanism, B: On-lock mechanism, 21: Housing.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) H01H 21/02 H01H 21/00

Claims (1)

(57) [Claims] An opening / closing trigger member of a switch mechanism housed in a housing is provided so as to be able to advance and retreat, and is mounted on a protruding piece protruding from the housing so as to be rotatable via a support shaft. Connect the trigger member to the operation button
The operation button is turned around the support shaft against the spring force, and the switch function is turned ON and OFF by the reciprocating operation of the trigger member, and the operation button is turned off-lock and on-lock. In the trigger switch including a lock mechanism for allowing the operation button to rotate, the lock mechanism is inserted into the protrusion so as to be axially movable in an axial direction substantially parallel to the axis of the support shaft, and An off-lock pin formed by extending the large-diameter portion and the small-diameter portion in the axial direction to form a coaxial shape, a lock plate fixed to one side of the operation button, and turning off the switch mechanism formed on the lock plate. A large-diameter portion through which the large-diameter portion of the off-lock pin is inserted in a direction orthogonal to the plate surface of the lock plate at a rotational position of the operation button to be operated, and The off-lock pin is formed in an arc shape in the circumferential direction around the support shaft to prevent the large-diameter portion of the off-lock pin from being inserted and to turn on the switch mechanism at the turning position of the operation button. A lock hole fixed to one end of the off-lock pin on the small-diameter portion side, and a spring force applied to the off-lock pin to the lock button side at all times. A biasing spring member is axially movable in a shaft hole formed in the projecting piece of the housing and is externally fitted to a large-diameter portion of the off-lock pin. An on-lock member connected to enable axial movement of a stroke, and a large-diameter portion of the on-lock member at a turning position of the operation button formed on the other side of the operation button and turning on the switch mechanism. Other end And a shaft hole through which the other side of the operation button is inserted.The off-lock pin is moved and held toward the lock button by the spring force of the spring member. An off-lock mechanism that locks and holds the rotation of the operation button at the initial position by constantly disposing the lock button in the large-diameter portion of the elongated insertion hole of the lock plate, and the lock button opposes the spring force of the spring member. To place the small-diameter portion of the off-lock pin in the small-diameter portion of the elongated hole of the lock plate, and turn the operation button by a predetermined amount around the support shaft to turn on the switch mechanism. Let
The lock button is further pressed at the ON operation position of the switch mechanism, and the other end of the ON lock member is inserted into a shaft hole formed on the other side of the operation button in conjunction with the axial movement of the OFF lock pin. By inserting and projecting the operation button outward, the operation button is pivotally returned around the support shaft by a predetermined amount to release the pressing of the lock button, and the other end of the on-lock member is released. An on-lock mechanism for locking the projecting stopper portion to the outer peripheral edge of the shaft hole in cooperation with the spring force of the spring member to lock the trigger hole.