JP6242579B2 - Trigger switch - Google Patents

Description

  The present invention relates to a trigger switch, and more specifically, a dial mountain shape is created in the middle of a short-circuiting movable contact on-stroke around a dial-type stroke adjusting means provided in the trigger so that the dial clicks halfway. It relates to a trigger switch that does not stop at an unstable position.

  The prior art trigger switch is provided with an adjustment dial for adjusting the pull-in of the trigger, and the stroke amount of the trigger is adjusted by rotating the adjustment dial. For example, a 7.5 mm trigger can be normally pulled, but it can be regulated so that it can only be pulled to 3.2 mm by rotating an adjustment dial.

  As shown in FIG. 10, the trigger switch in this prior art includes a switch body 120 having a lock button 119, a changeover switch unit 116 provided with a changeover lever 114, a trigger 123, and an adjustment dial 137 provided in the trigger 123. It is roughly composed of

In particular, as shown in FIG. 11, the adjustment dial 137 includes a knob 151 formed in a disk shape, a bar-shaped adjustment bar 152 formed so as to protrude from the center position of the knob 151, and a base side of the adjustment bar 152. Is provided with an engagement groove 153 that engages with a dial insertion hole 132 provided in the trigger 123, and a press-fitting rib 154 that forms the engagement groove 153 is provided inside.
When the press-fitting rib 154 is inserted into the dial insertion hole 132 of the trigger 123, the adjustment dial 137 is rotatably engaged by being press-fitted into and engaged with an engaging portion provided inside the dial insertion hole 132.

And the mountain shape 155 which brings about the click feeling provided in the back surface of this knob | pick part is radially provided, and the total 16 shape 155 is provided at equal intervals.
By pressing the dial pressing portion (shrinking) 134 of the trigger 123 into contact with the chevron shape 155, the dial pressing portion (shrinking) 134 is always at the valley 157 portion after pressing. It will be in the state where it is pressing.

JP 7-326249 A

  However, in the trigger switch described in the prior art, a crest is provided by providing a crest on the dial back side of the adjustment dial, but since the conventional crest shape is equally spaced and the same shape, a short-circuiting movable contact When the trigger is held in a state where the contact pressure immediately after turning on is weak, there is a problem that an arc is generated between the contacts due to vibration / impact and defects such as contact welding occur.

  Therefore, in the trigger switch with an adjustment dial, it is solved that the rotation of the adjustment dial constituting the stroke adjustment means attached to the trigger does not stop at an unstable control position immediately after the short-circuit movable contact is turned on. 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 contact sliding member that moves in conjunction with a trigger that controls the power source movable contact and the short circuit movable contact to be turned on by a pull-in operation of the trigger;
A stroke adjusting member for adjusting the stroke amount of the trigger;
An adjustment dial that is arranged in a state in which a dial pressing portion that creates a click feeling is in contact with a chevron shape provided on the back surface of the knob on the front surface of the trigger, and engages with the stroke adjustment member in a screwed relationship;
With
In the adjustment dial, the chevron shape provided on the back of the knob is first changed to a first chevron shape having a small chevron shape, and a second chevron shape having a large chevron shape from the middle.
(2) The second chevron shape of the large chevron shape is provided so as to be before and after turning a knob to turn on the short-circuit movable contact. Trigger switch.
(3) The trigger switch according to (1), wherein the second chevron shape of the large chevron shape has the same height and a long inclined surface.

  The trigger switch of the present invention adjusts the stroke amount with an adjustment dial attached to the trigger, and the mountain shape provided on the back of the knob is first made into a small mountain shape, and from the middle to a large mountain shape As a result, the dial can be turned on in a stable state without stopping at the position immediately after the short-circuit movable contact is turned on by adjustment.

It is a whole perspective view which shows the external appearance of the trigger switch which concerns on this invention. It is the whole exploded perspective view same as the above. It is the perspective view which removed the cover part and the trigger same as the above. It is a perspective view which shows an adjustment dial similarly. It is the top view seen from the back of the adjustment dial. FIG. 6 is a cross-sectional view when the adjustment dial is in an initial state. FIG. 6 is a cross-sectional view when the trigger is retracted when the adjustment dial is in the initial state. FIG. 6 is a cross-sectional view when the adjustment dial is rotated to an intermediate position. It is sectional drawing when a trigger is drawn in when an adjustment dial rotates to an intermediate position similarly. It is a perspective view which shows the external appearance of the trigger switch in a prior art. It is a perspective view which shows the adjustment dial in a prior art.

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

As shown in FIGS. 1 and 2, the trigger switch according to the present invention includes a switching lever 14 that switches between forward rotation and reverse rotation at the upper position, and an element in the internal space of the main body formed by the case 11 and the lid portion 12. A contact sliding member 22 that has a space for housing the package 13 and a space for housing the contact mechanism 15 and moves in conjunction with the trigger 23 that controls the power source movable contact 15 b and the short-circuit movable contact 15 a to be turned on by the pull-in operation of the trigger 23. And a stroke adjusting member 41 that adjusts the stroke amount of the trigger 23, and a dial pressing portion 34 that is arranged on the front surface of the trigger 23 and that creates a click feeling on the chevron shapes 38 and 39 provided on the back surface of the knob 51. And an adjustment dial 37 that is arranged in a state of being engaged with the stroke adjustment member 41 in a screwed relationship.
The contact mechanism 15 includes a short-circuit movable contact 15a and a power supply movable contact 15b, and the on / off control of the fixed contact and the movable contact is controlled by contact pressing portions (oscillators) 21a and 21b that slide on the respective upper surfaces.

  A contact sliding member 22 that slides the contact pressing portions (recessed portions) 21a and 21b is fixed to the trigger 23 with a screw and slides in conjunction with the pull-in of the trigger 23, and slides inside the contact mechanism 15. It has a contact sliding part 24 provided with two shores (contact pressing parts) 21a, 21b provided with a position shifted in the direction, and this contact sliding part 24 is connected to an operation shaft 25 and extends to the outside of the main body. It has an established structure. On the distal end side of the extended operation shaft 25, an adjustment member accommodating portion 26 formed in a cylindrical shape for accommodating the through hole 42 of the stroke adjusting member 41, and a fixing portion for fixing the trigger 23 to the outside of the adjustment member accommodating portion 26 28 is provided.

The trigger 23 has a connecting hole 31 that is connected to the fixing portion 28 of the contact sliding member 22 on the front side that is depressed by using a direct finger when pulling it in by hand, and an adjustment dial 37 at a substantially central position. A dial insertion hole 32 to be inserted is provided, and a dial pressing portion 34 which is an oscillating plate that abuts against the chevron shapes 38 and 39 provided on the back surface of the adjustment dial 37 at a lateral position of the dial insertion hole 32 to produce a click feeling. It is configured.
As shown in FIG. 6 in particular, the dial pressing portion 34 comes into contact with the chevron shapes 38 and 39 to provide moderation, and includes a contact portion 34b that directly contacts the chevron shapes 38 and 39. The structure is such that the abutting portion 34b is pressed against the chevron shapes 38 and 39 by engaging the spring 34a behind the portion 34b.

The stroke adjustment member 41 includes a through hole 42 formed in a spiral shape into which the adjustment dial 37 is fitted on the central axis, and the through hole 42 is slidably accommodated in the adjustment member accommodating portion 26 of the contact sliding member 22. The stopper bar 43 is provided so as to be connected to the through hole 42 and extend in the same direction as the through hole 42. Further, the base portion side end portion that supports the through-hole 42 is provided with a locking portion 46 that locks the stopper portion 45 at the end portion of the lid portion 12. A stopper hole 44 that engages with the lock button 19 is provided at the center position of the stopper bar 43.
An adjustment bar 52 formed in a spiral shape of the adjustment dial 37 is screwed into the through hole accommodated in the adjustment member accommodation portion from the outside where the trigger 23 is attached.

  As shown in FIG. 4 in particular, the adjustment dial 37 includes a knob 51 formed in a disk shape, a bar-shaped spiral adjustment bar 52 that protrudes from the center of the knob 51, and a base side of the adjustment bar 52. Is provided with an engagement groove 53 that engages with a dial insertion hole 32 (see FIG. 2) provided in the trigger 23, and a press-fitting rib 54 that forms the engagement groove 53 is provided inside.

  When the press-fitting rib 54 is inserted into the dial insertion hole 32 of the trigger 23, the adjustment dial 37 can be freely rotated by being press-fitted into an engagement portion 56 (see FIG. 2) provided inside the dial insertion hole 32. Engage with.

Further, the chevron shapes 38 and 39 that provide the click feeling provided on the back surface of the adjustment dial 37 of the present invention are changed so as not to become unstable when the short-circuit movable contact 15a is turned on in the stroke adjustment. It is a thing. The chevron shapes 38 and 39 are composed of a small chevron shape 38 (first chevron shape) and a large chevron shape 39 (second chevron shape). The valley portion is formed approximately twice as wide and consists of a total of six peaks. The large mountain shape 39 is composed of a valley 39a having the same width as the mountain about three times as large as the small mountain shape 38, and the slope of the mountain is widened at a halfway position in the mountain portion. It is a structure that eliminates the stay, and consists of a total of four peaks.
The chevron shapes 38 and 39 are set so that the valleys 38a and 39a are lower than the outer shell 40 having a constant width provided on the back surface. For this reason, when the contact portion 34b of the dial pressing portion 34, which is a basin, is housed in the peaks 38a and 39a, the structure cannot easily deviate from the valleys 38a and 39a.
The position having the large mountain shape 39 is directly connected to the positional relationship for turning on the short-circuit movable contact 15a by the contact sliding portion 24 described later.

  In other words, the dial pressing portion 34 is moved to the large chevron 39 and moves toward the top, but even if the rotation of the knob 51 is stopped halfway without giving a click feeling, Even if it stops at the middle, it is guided to the bottom of the valley 39a by the inclination. Therefore, a phenomenon of staying at a halfway position, for example, near the peak of a mountain is avoided, so that the contact of the short-circuit movable contact 15a due to the pulling in an unstable state can be avoided. By making the larger mountain shape 39 and reducing the number of peaks, the number of times of crossing the peaks can be reduced, and the unstable condition can be reduced.

  When each component having such a structure is assembled, first, the element package 13 and the movable contacts 15a and 15b are accommodated in the case 11, and the through hole 42 of the stroke adjusting member 41 is accommodated in the contact sliding member 22 and the adjustment member accommodating portion 26. And the return spring 47 is engaged with the contact sliding member 22. And the trigger 23 is attached to the fixing | fixed part 28 of the contact sliding member 22, and it fixes with a screw | thread. Then, the adjustment dial 37 is engaged with the dial insertion hole 32 of the trigger 23, and the press-fitting rib 54 of the adjustment dial 37 is press-fitted and inserted into the engagement portion 56 provided at the back of the dial insertion hole 32. Thus, the adjustment bar 52 is screwed into the through hole 42 in a state in which the engagement portion 56 is supported so as to be prevented from coming off. At this time, since the dial pressing portion (shrinking) 34 of the trigger 23 is press-fitted in a state of being in contact with the chevron shape 38 on the back surface of the adjustment dial 37, the chevron-shaped shape is always used after the press-fitting. ) 34 is in a pressed state.

  Then, the adjustment dial 37 is rotatably mounted in a state in which the adjustment dial 37 is prevented from being detached. Since the adjustment bar 52 is screwed into the through hole 42, the knob 51 is rotated so that the mountain shape 38 on the back surface is obtained. 39, the abutting portion 34b of the dial pressing portion 34 abuts to produce a click feeling, and the stroke of the trigger 23 can be adjusted by adjusting the stroke adjusting member 41.

  Next, when the adjustment dial 37 is not rotated and is at the minimum position, that is, when the stroke can be drawn to the maximum, the adjustment dial 37 is moved from the trigger 23 as shown in FIGS. The adjustment bar 52 of the adjustment dial 37 is fitted so as not to be pulled out, and is helically fitted into the through hole 42 slidably accommodated in the adjustment member accommodating portion 26 of the contact sliding member 22. When it is in the state, the knob 51 is rotated so that the minimum position, that is, the contact portion 34b of the dial pressing portion 34 is located at the first valley 39a from the start position. Then, since the through hole 42 screwed into the adjustment bar 52 is pulled closest to the knob 51, the locking portion 46 of the stroke adjustment member 41 that moves together with the trigger 23 is aligned with the stopper portion 45 of the lid portion 12. It becomes a distant positional relationship. When the trigger 23 is pulled in this state, as shown in FIG. 7, the maximum stroke can be obtained by pulling the trigger 23, and the contact pressing portion (oscillating) 21a of the contact sliding member 22 is short-circuited movable contact 15a. The short-circuit movable contact 15a is reversed to the ON state when the upper surface of the short-circuit movable contact 15a is passed through the switching portion, and the contact pressing portion 21a slides the upper surface of the short-circuit movable contact 15a in response to the trigger 23 being pulled. Move. Further, when the trigger 23 is further drawn and the locking portion 45 is pressed against the stopper portion 46, the contact pressing portion (oscillating) 21a reaches the position shown in the figure, so that the short-circuit movable contact 15a is stabilized. The contact state can be maintained.

  Next, when the adjustment dial 37 is rotated and is rotated approximately half from the start position, that is, when the stroke is reduced to about half, as shown in FIGS. Rotate and place the contact pressing part (retainer) 34 at the part of the valley 39a over the first large mountain shape 39.

Then, the through hole 42 screwed into the adjustment bar 52 is separated from the knob 51, and accordingly, the stroke adjustment member 41 is also separated from the knob 51 and becomes closer to the stopper portion 45 than the knob 51. When the trigger 23 is pulled in this state, a substantially half stroke can be obtained as shown in FIG. 9, and the contact pressing portion (oscillating) 21a of the contact sliding member 22 slides on the upper surface of the short-circuit movable contact 15a. The short-circuit movable contact 15a is reversed to the ON state when passing through the switching portion, and the contact pressing portion (oscillating) 21a slides on the upper surface of the short-circuit movable contact 15a in response to the pull of the trigger 23, but is reversed. In the vicinity of the position, the contact pressing portion (retainer) 21a keeps the short-circuit movable contact 15a on. At this time, that is, when the short-circuiting movable contact 15a is maintained in the ON state in the vicinity of the position where the contact pressing portion (retainer) 21a is reversed, if the dial of the knob 51 is in an unstable state, the stroke The amount of control changes slightly. This is because the contact pressing portion 21a that moves in conjunction with the pull-in of the trigger 23 slightly moves on the upper surface of the short-circuit movable contact 15a. Therefore, when the short-circuiting movable contact 15a is reversed, it adversely affects the contact state of the short-circuiting movable contact 15a. In the present invention, in order to avoid such a state, the contact portion 34b of the dial pressing portion (retainer) 34 of the knob 51 is formed in the chevron shape 39 when the contact pressing portion (recessed portion) 21a is in the vicinity of the reverse position. This is because the mountain shape is changed so that it is smoothly moved from the mountain and located at the valley 39a.
This trigger switch can be applied to a power tool such as a drill.

  Adjusting the stroke amount with the adjustment dial attached to the trigger, the chevron shape provided on the back of the knob is changed to a small chevron shape at first, and from the middle to the large chevron shape. Provided is a trigger switch that can be turned on in a stable state without stopping the dial immediately after being turned on.

DESCRIPTION OF SYMBOLS 11 Case 12 Cover part 13 Element package 14 Switching lever 15 Contact mechanism 15a Short-circuit movable contact 15b Power supply movable contact 17 Movable contact 18 Fixed contact 19 Lock button 21a Contact press part (Oshibo)
21b Contact pressing part (Oshibo)
22 Contact sliding member 23 Trigger 24 Contact sliding part 25 Operation shaft 28 Fixed part 31 Connection hole 32 Dial insertion hole 34 Dial pressing part (Oshibo)
37 Adjustment dial 38 Small chevron shape (first chevron shape)
38a Valley 39 Large mountain shape (second mountain shape)
39a Valley 40 Outer 41 Stroke adjusting member 42 Through hole 43 Stopper bar 44 Stopper hole 45 Stopper part 46 Locking part 47 Return spring 51 Knob 52 Adjustment bar 53 Engaging groove 54 Press-in rib 56 Engaging part

Claims (3)

An adjustment dial that has a plurality of chevron shapes and is rotatable,
A trigger whose maximum pull-in position changes according to the rotation position of the adjustment dial;
A short-circuiting movable contact that is turned on when the trigger is retracted beyond a predetermined retracting position;
When the adjustment dial is rotated, the dial pressing part brings out a click feeling by abutting with the mountain shape,
With
The second mountain-shape of said plurality of mountain-shaped, the maximum rotational retracted position is a range of pull said to position trigger within pull unstable state of before and after the short movable contact is turned on When the adjustment dial is rotated to an internal rotation position, the adjustment dial is disposed at a position that contacts the dial pressing portion, thereby preventing the adjustment dial from stopping at the rotation position within the rotation range. ,
The first chevron shape among the plurality of chevron shapes, when the adjustment dial is rotated to a rotational position where the maximum retracted position of the trigger is a retracted position before the predetermined retracted position, Provided at a position in contact with the dial pressing portion;
The second chevron shape is wider than the first chevron shape,
Trigger switch. An adjustment dial that has a plurality of chevron shapes and is rotatable,
A trigger whose maximum pull-in position changes according to the rotation position of the adjustment dial;
A short-circuiting movable contact that is turned on when the trigger is retracted beyond a predetermined retracting position;
When the adjustment dial is rotated, the dial pressing part brings out a click feeling by abutting with the mountain shape,
With
The second mountain-shape of said plurality of mountain-shaped, the maximum rotational retracted position is a range of pull said to position trigger within pull unstable state of before and after the short movable contact is turned on When the adjustment dial is rotated to an internal rotation position, the adjustment dial is disposed at a position that contacts the dial pressing portion, thereby preventing the adjustment dial from stopping at the rotation position within the rotation range. ,
The first chevron shape among the plurality of chevron shapes, when the adjustment dial is rotated to a rotational position where the maximum retracted position of the trigger is a retracted position before the predetermined retracted position, Provided at a position in contact with the dial pressing portion;
The third chevron shape among the plurality of chevron shapes is when the adjustment dial is rotated to a rotational position where the maximum retracted position of the trigger is a retracted position ahead of the predetermined retracted position. Provided at a position in contact with the dial pressing portion;
The third chevron shape is wider than the first chevron shape,
Trigger switch. An adjustment dial that has a plurality of chevron shapes and is rotatable,
A trigger whose maximum pull-in position changes according to the rotation position of the adjustment dial;
A short-circuiting movable contact that is turned on when the trigger is retracted beyond a predetermined retracting position;
When the adjustment dial is rotated, the dial pressing part brings out a click feeling by abutting with the mountain shape,
With
The second mountain-shape of said plurality of mountain-shaped, the maximum rotational retracted position is a range of pull said to position trigger within pull unstable state of before and after the short movable contact is turned on When the adjustment dial is rotated to an internal rotation position, the adjustment dial is disposed at a position that contacts the dial pressing portion, thereby preventing the adjustment dial from stopping at the rotation position within the rotation range. ,
The first chevron shape among the plurality of chevron shapes, when the adjustment dial is rotated to a rotational position where the maximum retracted position of the trigger is a retracted position before the predetermined retracted position, Provided at a position in contact with the dial pressing portion;
The third chevron shape among the plurality of chevron shapes is when the adjustment dial is rotated to a rotational position where the maximum retracted position of the trigger is a retracted position ahead of the predetermined retracted position. Provided at a position in contact with the dial pressing portion;
The second chevron shape and the third chevron shape are wider than the first chevron shape,
Trigger switch.

Images