JP2003109451A - Trigger switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a trigger switch which high reliability which can be tinned while ensuring high dust proofing property by improving a construction for incorporating a control element to a case. SOLUTION: This trigger switch performs switching operation of a switch mechanism inside the case, based on a trigger operation. The trigger switch incorporates a switch mechanism in an inner space portion of the case. One side surface opening portion of the case opening correspondingly to the inner space portion of the case is covered with a cover to be sealed, and the control element is housed in a housing recessed portion formed in one portion of the other side surface of the case. The other side surface of the case including an outer surface of the control element is covered by a heat radiating plate to be integrated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a trigger switch used by being incorporated in, for example, an electric power tool, and more particularly to a trigger switch having an improved internal structure to have a reduced thickness and dustproof property.

[0002]

2. Description of the Related Art In general, a trigger switch of this type integrally includes a switch mechanism for performing a switching operation based on a trigger operation, a case containing a control element and a board, a cover for covering the opening surface, and a heat sink. It is configured as a chemical structure.

Further, since the temperature of the internal control element rises during use, the control element itself is heated to a high temperature. Therefore, a metal radiator plate is brought into contact with the control element to protect the control element from cooling. .

In this case, since the control element needs to be brought into direct contact with the electrical wiring to the switch mechanism inside the case and the heat radiating plate outside the case, it is difficult to arrange the control element. For example, a small opening is provided in the cover to bring the control element into contact with the heat dissipation plate outside the case, and the control element is interposed in this opening to deal with the problem.
(See, for example, JP-A-10-69838 of the prior application).

[0005]

However, in this case, dust may enter from the outside due to vibration or impact from a slight gap of the opening opened for arranging the control element, and this dust is internal switch mechanism. There was a risk that In particular, when the trigger switch is applied to an electric tool, it is used in an adverse environment where dust is likely to be generated, and thus high dust protection has been desired.

Further, as a trigger switch having high dustproofness, a base having both surfaces set as mounting surfaces of components is provided, a switch mechanism is mounted on one side of the base, and a control element is mounted on the other side of the base. It is conceivable that there is a trigger switch in which the switch mechanism and the control element are separated by the base and separated on both sides, and both opening surfaces are covered with a cover or a heat sink to form an integrated structure. Having become thicker overall from the total thickness of the mounted components on both sides, in recent years,
There is a problem in that the structure is not suitable for a narrow grip in consideration of a wide range of users demanded in the electric tool industry.

Therefore, an object of the present invention is to provide a highly reliable trigger switch capable of realizing a thin structure while ensuring a high dustproof property by improving a structure in which a control element is incorporated in a case. .

[0008]

SUMMARY OF THE INVENTION The present invention is a trigger switch for performing a switching operation of a switch mechanism inside a case based on a trigger operation, the switch mechanism being built in an inner space of the case, An opening on one side of the case that opens corresponding to the inner space is covered with a cover to be sealed, and a control element is stored in a storage recess formed on a part of the other side of the case. It is characterized in that the other side surface of the case including is covered with a heat dissipation plate to be integrated.

Here, the case may be a rectangular parallelepiped having one side open.

The switch mechanism can be constructed by incorporating a contact switching structure for switching between the contact portions to turn them on and off according to a trigger operation, and a control system component thereof.

The cover can be formed in a flat plate shape corresponding to the opening on one side surface of the case.

The heat radiating plate may be made of a metal plate having good heat conductivity and suitable for heat radiation.

According to the present invention, the control element is housed in the housing concave portion formed on the other side surface of the case so that the control element, which may be damaged by heat when the trigger switch is used, may be damaged. Since it is arranged so as to be depressed in the recess, it does not protrude from the outer surface of the case, and it can be efficiently attached integrally with the case, and the overall thickness can be reduced.

In particular, if the switch mechanism on one side of the case and the control element on the other side of the case are selected and arranged so as not to overlap in the thickness direction, the thickness of the control element can be surely shortened and thinned. can do.

Further, since the entire control element is mounted by being fitted into the accommodation recess on the other side surface of the case and there is no case opening gap for arranging the control element, there is no risk of dust entering and high dustproofness is secured. can do. Therefore, it is possible to secure high dustproofness simply by providing a storage recess on the other side surface of the case, and to obtain a highly reliable trigger switch that can achieve both high dustproofness and thinning at the same time. Ease of gripping the requested trigger switch,
It can be applied to a wide range of users by enabling a thin grip that is easy to handle.

Further, when electrically connecting the control element, the wiring of the control element can be efficiently connected to the switch mechanism side by simply penetrating the terminal of the control element from the other side surface of the case to one side surface of the case. Further, the terminal is a small shaft, and since it is only partially penetrated through a small through hole, there is almost no gap, and a structure in which dust hardly enters is also suitable for dustproofness.

Further, when the control element and the heat sink are brought into contact with each other, if an elastic body is interposed between the control element and the accommodating recess, the elastic action causes the control element and the heat sink to be separated from each other. Appropriate contact action is obtained. For example, if the spring washer is interposed in a compressed state, the control element is biased outward by the elastic restoring force of the spring washer, and the outer surface of the control element is strongly attached to the radiator plate corresponding to the outward. Contact. Therefore, the amount of heat generated in the control element is thermally conducted and absorbed by the heat dissipation plate, and a stable cooling protection function can be obtained through the heat dissipation plate.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. The drawing shows the trigger switch,
As shown in FIGS. 1 and 2, this trigger switch 11
Is a case 12 having a vertically long box shape, and this case 12
The switch mechanism 13 housed on the open surface side of the, the trigger 15 connected to the operation shaft 14 for switch operation, the board 16 on which the control parts are mounted, and the cover 17 are provided on one side surface of the case 12 described later. It is attached to the open inner space,
On the other side surface of the case 12, a control element (FET) 19 and a heat sink 20 are provided with a rivet 2 via a spring washer 18.
It is assembled to the case 12 after being fixed by crimping integrally with 1.

The case 12 described above, as shown in FIG.
The switch mechanism 13 is incorporated in the inner space portion 22 opening on one side surface of the box shape, and the operation shaft 14 for switching operation from outside is projected outward from the front side of the case 12,
A trigger 15 is attached to the outer end of the operation shaft 14.
Then, by moving the trigger 15 axially back and forth against the inner trigger return spring 23, the movable piece 13a incorporated in the switch mechanism 13 interlocked therewith is moved to make contact with a fixed piece (not shown). Switching operation is performed by switching between parts.

A board 16 on which a printed circuit and control parts are mounted is provided on the upper surface of the switch mechanism 13, and the entire open surface of the board 16 is covered with a flat plate-like cover 17 to form an inner space 22 of the case 12. Closed tightly.

At this time, when connecting the case 12 and the cover 17, the engaging connecting pieces 25 of the cover 17 are engaged with the engaging protrusions 24 provided on the outer periphery of the case 12 to be integrated. Connect to.

On the other hand, the FET 19 is provided on the other side surface of the case 12.
A storage recess 26 is formed for mounting. The accommodating recess 26 accommodates the same shape as that of the FET 19 with high accuracy, and since the lower surface side of the FET 19 is provided in a stepped stepped shape, a stepped recess corresponding to the same shape is formed. And the FE is formed in the storage recess 26.
T19 is fitted and positioned and stored accurately.

In this case, the recess formation position of the storage recess 26 is determined by selecting the lower position of the side surface of the case that does not overlap the position where the switch mechanism 13 is arranged in the thickness direction of the case. As a result, the switch mechanism 13 and the FET 19 do not overlap with each other in the thickness direction of the case, and the FET 19 is housed in the housing recess 26 in a state of being entirely flush with the housing recess 26 and partially protruding in the thickness direction of the case 12. Therefore, the thickness direction can be shortened by the thickness of the FET 19. As a result, the trigger switch can be made thinner.

When the FET 19 is mounted, as shown in FIG. 4, a small terminal through hole 26a is provided adjacent to the storage recess 26 from the other side surface of the case to one side surface of the case. By penetrating the terminal 19a, wiring can be efficiently connected to the switch mechanism 13 mounted on one side surface of the case. In this case, since the terminal 19a is a small shaft and is partially penetrated into the small terminal through hole 26a in a press-fitted state, there is almost no gap and it is difficult for dust to enter, thus ensuring dustproofness.

Further, a case side wall provided as a partition wall between the one side surface and the other side surface of the case in the storage recess 26 and F.
A rivet insertion hole 2 is formed in the ET 19 and a heat sink 20 described later.
6b, 19b, 20a are provided so as to penetrate,
The FET 19 is housed in the housing recess 26 with the spring washer 18 interposed, and the upper surface of the FET 19 is covered by the heat sink 2.
The metal rivet 21 is passed through the rivet insertion holes 26b, 19b, and 20a in a state of being covered with 0 and integrally fixed by caulking.

At this time, the spring washer 18 interposed between the case side wall in the storage recess 26 and the FET 19.
The spring washer 18 in the compressed state.
The FET 19 is urged outward by the elastic return action of and is caulked and fixed. For this reason, the outer surface of the FET 19 is always in contact with the heat dissipation plate 20 that corresponds to the outside thereof in a planar manner, and the heat generated by the FET 19 itself is absorbed by the heat conduction effect of the heat dissipation plate 20, so that good heat dissipation is always achieved. Is performed, and a highly reliable cooling protection function of the FET 19 is obtained.

The heat radiating plate 20 is made of a metal plate having a good thermal conductivity in an L shape and covers the other side surface of the case 12 and the back surface adjacent to the case 12 in an L shape. The heat radiating plate 20 with a rim is integrally caulked and fixed to the case 12 by a metal rivet 21, so that it is a high-strength attachment that is rich in impact resistance, and the completed trigger switch is assembled into an electric tool, It will not be damaged even if it is subjected to drop impact or strong vibration, and reliable and stable holding performance can be obtained.

Therefore, the mounting performance is higher than that of a radiator plate mounted by heat-crimping an ordinary resin member, the crimped portion is not damaged due to a shock or the like, and the radiator plate is accidentally detached from the case. Disappear.

A heat caulking shaft 27 is provided on the upper portion of the other side surface of the case 12 so as to project from the heat radiating plate 20.
It engages with a U-shaped groove 28 opened on the side opposite to the surface, and auxiliary heat caulking is fixed. In addition, a pair of engagement shafts 29 projecting to the rear surface side of the case 12 are engaged with and fixedly positioned in engagement holes 30 that are open to the rear surface side of the heat dissipation plate 20 that opposes the shafts.

Further, a switching lever 31 which tilts about one end as a fulcrum is attached to the upper part of the case 12, and the inner contact portions are switched based on the tilting operation of the lever 31 in the switching direction. In the figure, 32 is an operation shaft guide hole, and 33 is an FE.
The board | substrate connection part of T terminal 19a is shown.

The trigger switch 11 configured as described above
When the trigger 15 is pulled to start the switching operation, the inner switch mechanism 1 is driven based on the trigger operation.
The contacts 3 are turned on, and at this time, the output of full speed rotation is obtained when the trigger 15 is fully retracted. After that, when the operating force of the trigger 15 is loosened, the trigger 15 returns to its original state and is switched off.

Further, the trigger switch 11 can be used by incorporating it in various electric tools, and when a thin trigger switch is incorporated in an electric tool and used, a fine grip can be obtained, so that the hand is small. Even a user, such as a woman, can use it as an electric tool that is easy to grasp and handle.

Further, while the trigger switch 11 is in use, the FET 19 gradually heats up and its temperature rises.
Since T19 maintains a state of being strongly pressed and contacted with the heat dissipation plate 20 by the biasing force of the inner spring washer 18, heat can be efficiently absorbed and radiated through the heat dissipation plate 20. As a result, it is possible to perform cooling protection based on a stable heat radiation effect from beginning to end, and it can be used as a thin and highly reliable trigger switch having excellent impact resistance and cooling protection performance.

As described above, the FET, which needs to be protected by cooling and which may be damaged by heat generation, is housed in the housing recess formed on the other side surface of the case, so that the FET is arranged in a state of being sunk in the housing recess. Therefore, the trigger switch does not protrude from the outer surface of the case, so that the entire trigger switch can be thinned to be thin. Further, since there is no case opening gap for arranging the FET, there is no possibility that dust will enter, and high dustproofness can be secured.

In the correspondence between the configuration of the present invention and the configuration of the above-described one embodiment, the control element of the present invention corresponds to the FET 19 of the embodiment, and hereinafter, similarly, the elastic body corresponds to the spring washer 18. Correspondingly, the present invention can be applied based on the technical idea shown in the claims, and is not limited to the configuration of the above-described one embodiment.

[0036]

According to the present invention, by fitting and mounting the control element in the accommodating recess on the other side surface of the case, the control element can be thinned by the thickness of the control element, and the case for arranging the control element can be provided. Since there is no opening gap, there is no risk of dust entering, and a highly reliable trigger switch can be obtained which can achieve both thinning and high dust resistance at the same time only by providing a storage recess on the other side surface of the case. For this reason, the ease of gripping the trigger switch required in the electric tool industry,
It can be applied to a wide range of users by enabling a thin grip that is easy to handle.

[Brief description of drawings]

FIG. 1 is an external perspective view of a trigger switch.

FIG. 2 is an exploded perspective view of a trigger switch.

FIG. 3 is a perspective view of a main part showing a switch mechanism of a trigger switch.

FIG. 4 is an exploded perspective view showing a state in which a trigger switch FET is mounted.

[Explanation of symbols]

11 ... Trigger switch 12 ... Case 13 ... Switch mechanism 15 ... Trigger 17 ... Cover 18 ... Spring washer 19 ... FET 20 ... Heat sink 21 ... Rivet 22 ... Inner space

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Yoshiki Takashima             34, Ishidamoriminami-cho, Fushimi-ku, Kyoto City Housing Corporation             Daigo Ishida housing complex 16-501 F-term (reference) 5G006 BA01 BB01 BC07 LB03

Claims (5)

[Claims] 1. A trigger switch for performing a switching operation of a switch mechanism inside a case based on a trigger operation, wherein the switch mechanism is built in an inner space portion of the case,
A control element is housed in a housing recess formed in a part of the other side surface of the case, the side surface opening of the case opening corresponding to the inner space of the case being covered with a cover and hermetically sealed. A trigger switch that covers the other side of the case including the outer surface of the case with a heat sink and integrates it. 2. The trigger switch according to claim 1, wherein the storage recess is formed by selecting a position that does not overlap the switch mechanism in the thickness direction. 3. The control element is connected to a switch mechanism by penetrating a terminal of the control element from the other side surface of the case to one side surface of the case opposite thereto.
Trigger switch described. 4. The trigger switch according to claim 1, wherein the control element is attached to the storage recess with an elastic body interposed in a compressed state. 5. A heat sink, a control element, a spring washer, and a case side wall, which are arranged from the outer surface side of the housing recess on the other side surface of the case, are rivet-pierced and integrally caulked and fixed. The trigger switch according to claim 1.