JPH0722011Y2 - Switch mounting structure for electric tools - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switch mounting structure for an electric power tool.

[0002]

2. Description of the Related Art It is preferable that a power tool used for a work in which a lot of dust is generated is equipped with a dustproof switch. Has been done.

That is, in FIGS. 9 to 11, 1 is a housing of an electric tool (thunder), 2 is a switch unit, and 3 is a boss portion provided in the housing. The entire housing 1 can be divided into a right housing 1A and a left housing 1B as shown in FIG.

The switch unit 2 has a substantially rectangular outer shape and a flange portion 4 surrounding the peripheral surface portion.
and a switch cover 5 covering the operation surface portion 4b of the switch 4 and the flange portion 4a.
And a resin switch fixing member 6 for sealingly fixing the cover 5. In this case, 4c is a strip-shaped elastic piece formed integrally with the switch housing, 4d is an operating member supported by the switch housing and capable of swinging about an axis x, and 4e is a connecting terminal, and is shown in FIG. Reference numeral 5a is a protrusion that is provided so as to project from the edge of the switch cover 5.

As shown in FIG. 11, the switch fixing member 6 comprises a frame portion 6a and a support plate portion 6b. The frame portion 6a has a step portion m1 for locking the flange portion 4a of the switch 4 on the inner surface thereof, and a recess n into which the protrusion 5a is fitted is formed at a fixed position thereof. Further, a step portion m2 that is engaged with the boss portion 3 is formed on one surface of the support plate portion 6b.

The boss portion 3 has a box shape having a bottom surface portion 3a, a side surface portion 3b, a rear surface portion 3c, and a front portion locking portion 3d.

When the switch unit 2 is fixed to the switch fixing member 6 and the switch cover 5 is fixed, the switch unit 2 is set in the frame portion 6a of the switch fixing member 6 as shown by a chain line g in FIG. The switch plate s, which is a rectangular metal frame, is fixed to the switch plate s. The state after assembly in this way is as shown in FIG.

Next, when this is mounted on the housing 1, the housing 1 is divided and the switch unit 2 is assembled to the rib portion of either one of the housings 1A or 1B, and the other housing 1B or 1A is covered to cover both. So that they are combined.

Reference numeral 1a is a joint surface that appears on the divided surface of the housing 1.

[0010]

In the above-mentioned switch mounting structure, the function of the switch 4 can be maintained satisfactorily for a long period of time because the presence of the switch cover 5 prevents dust from contacting the operation surface 4b of the switch 4. However, there are the following problems for structural reasons.

That is, since the switch fixing member 6 is made of resin, a relatively large wall thickness is required to provide the necessary strength, and therefore the switch unit 2 has a large shape. Making it difficult to make the switch mounting structure compact.

Further, since a resin switch fixing member 6 and a metal switch plate s are required as parts for fixing the switch cover 5 in a fixed state, both in terms of parts manufacturing work and assembly work. Both were costly.

An object of the present invention is to provide a switch mounting structure for an electric power tool which can solve the above problems.

[0014]

In order to achieve the above object, the present invention is directed to a switch having a front surface as an operation surface and a flange portion formed on a side peripheral surface portion. The operation surface portion and the flange portion are made of a soft elastic film such as rubber. In the switch unit covered with the switch cover, the switch fixing metal fitting bent in a U-shaped cross section from above the cover is fitted to each of a pair of flange portions of the switch unit facing each other, and It is characterized in that the flange portion to which the fixing metal fitting is fitted is fitted and locked in the groove provided at the switch mounting position.

At this time, a protrusion in an extended state is provided on the end edge of the switch cover, and the protrusion is engaged with the notch of the fixing metal fitting to prevent the fixing metal fitting from coming off from the flange portion. It is preferable that the configuration be made.

Further, the two switch fixing fittings fitted to the respective flanges may be joined by a connecting piece to form a single fixing fitting having a generally U-shape.

The rear end portion of the switch unit may be engaged with a support portion provided at the switch mounting portion of the housing. However, the supporting portion is provided as needed and only plays an auxiliary role.

[0018]

The switch and the switch cover are fixed to the housing of the electric tool via the switch fixing metal fittings. Since the switch fixing metal fittings are made of metal, they are extremely thin plates of, for example, about 0.3 mm. Also, there is no problem in strength, and this makes the switch mounting structure compact.

Further, the switch fixing metal fitting replaces the conventional switch fixing member and the switch plate, and since it is processed very easily, the manufacturing cost is reduced.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A concrete embodiment of the present invention will be described below with reference to the drawings. The same parts as those in the conventional example are designated by the same reference numerals.

First, the first embodiment will be described with reference to FIG.
Is a side view of a power tool (thunder), FIG. 2 is a front view thereof,
3 is a partially enlarged view, FIG. 4 is a plan view of the switch unit, (b) is a side view and (c) is a rear view, and FIG. 5 is a view of a switch fixing metal fitting.

As shown in FIG. 2, the housing 1 of the electric power tool is formed of a right housing 1A and a left housing 1B so that it can be divided at the width center, and the material thereof is a resin material.

A switch cover 5'is attached to the switch 4 so as to cover the front operation surface portion 4b and the flange portion 4a.

A switch fixing metal fitting 7 is fitted from above the switch cover 5'on each of the pair of opposed flange portions 4a, 4a to form an integral switch unit 2 '. This switch fixing metal fitting 7
5 has a U-shaped cross section as shown in FIG. 5, and is manufactured by pressing a steel plate or the like. The steel plate used here has a plate thickness of, for example, about 0.3 mm.

On the other hand, grooves 10 and 10 into which the flange portions 4a and 4a in which the fixing metal fitting 7 is fitted are fitted are formed at upper and lower positions at positions outside the switch mounting portion of the housing 1.

A support portion 8 for locking the rear end of the switch unit 2'is provided at a position near the switch mounting position. The supporting portion 8 may be of any type as long as it can securely hold the rear end portion of the switch housing. In this example, the four corners of the rear end portion of the switch housing can be positionally regulated. is there.

However, when the switch unit 2'with the switch fixing metal fittings 7, 7 fitted thereto is mounted on the housing 1, the housing 1 is divided and the flange portions 4a, 4a of the switch unit 2'are separated. It fits into the grooves 10 and 10 of either one of the housings 1A and 1B, and supports the rear end portion of the switch housing through the support portion 8. Next, the housing 1A or 1B in this state is covered with the other housing 1B or 1A so as to connect the both.

In the above-described embodiment, the switch fixing metal fittings 7 are provided on the respective flanges of the switch 4 facing each other in the horizontal direction.
7 may be fitted, and the housing 1 may be provided with a longitudinal groove for fitting these flange portions.

6A and 6B relate to the second embodiment. FIG. 6A is a plan view of the switch unit, FIG. 6B is a side view, FIG. 6C is a rear view, and FIG.

The switch cover 5 of this embodiment is provided with projecting protrusions 5a at the end edges of the portions existing on the pair of opposed flange portions 4a, 4a. Further, each switch fixing metal fitting 7'is provided with a notch 7'a at a position corresponding to the position of the projection 5a. Then, the switch fixing metal fitting 7'is fitted from above the switch cover 5 to the pair of opposed flange portions 4a, 4a so as to be in a state of protruding toward the rear end side of the switch unit 2 ". There is.

When the switch unit 2 "is mounted in the housing 1, the projections 5a ... Are fitted into the recesses formed in the housing 1 in advance.

FIG. 7 relates to the third embodiment. (A) is a plan view of the switch unit, (b) and (c) are side and rear views thereof, and (d) is a switch fixing metal fitting integrally. The front view which shows the state couple | bonded, (e) is the side view.
In this example, a pair of switch fixing metal fittings 7, 7 fitted to the flange portions 4a, 4a are combined by a connecting piece 7b to form a single fixing metal fitting 7A having a generally U-shape. It is similar to that of the first embodiment. Here, the single fixing metal fitting 7A is manufactured, for example, by punching a metal plate into a required shape and press-working the punched one. In this example, the flange portion 4a,
When the switch unit 2'after fitting the switch fixing metal fittings 7, 7 to 4a is assembled to the housing 1, the free ends of the switch fixing metal fittings 7, 7 are grasped in the directions 51 and 52 with fingers and these two switches are attached. The metal fittings 7, 7 are held in parallel, and the metal fittings 7, 7 in this state are held in the housing 1
To be fitted in the grooves 10, 10 (see FIG. 3).
At this time, one end of each of the switch fixing brackets 7 and 7 has a coupling piece 7b.
Are easily held in parallel because they are joined by the groove 10,
It becomes easy to be fitted to 10.

FIG. 8 relates to the fourth embodiment, (a) is a plan view of a switch unit, (b) and (c) are side views and rear views, and (d) is a state in which switch fixing metal fittings are combined. Is a perspective view thereof, (e) is a plan view thereof, and (f) is X1-X.
FIG. In this example, a pair of switch fixing metal fittings 7 ', 7'fitted to the flange portions 4a, 4a are connected by a connecting piece 7'b to form a single fixing metal fitting 7B having a generally U-shape. Other configurations are similar to those of the second embodiment. Also in this embodiment, the switch fixing fittings 7'and 7'are handled in accordance with those of the third embodiment when used.

[0034]

According to the present invention configured as described above,
A switch with a switch cover can be attached to the housing only through the switch fixing metal fittings, and since the metal fittings can be extremely small, the switch mounting structure can be made significantly compact. Providing an extended protrusion on the edge of the cover and engaging the protrusion with a notch in the fixing metal fitting prevents the fixing metal fitting from sliding and falling off. Since the processing and the mounting work of the switch are relatively easy, the manufacturing cost can be reduced.

Further, if a pair of switch fixing metal fittings fitted to the respective flange portions are connected by a connecting piece to form a U-shaped unitary metal fixing metal fitting, the position of the switch fixing metal fittings can be easily stabilized to the housing. The switch unit can be assembled efficiently.

[Brief description of drawings]

FIG. 1 is a side view of an electric power tool according to a first embodiment of the present invention.

FIG. 2 is a front view of the tool.

FIG. 3 is an enlarged cross-sectional view of a part of the tool.

FIG. 4 relates to the switch unit according to the embodiment,
(A) is a plan view, (b) is a side view, and (c) is a rear view.

FIG. 5 is a view of a switch fixing metal fitting according to the embodiment.

6A is a plan view of a switch unit, FIG. 6B is a side view, FIG. 6C is a rear view, and FIG. 6D is a view of a switch fixing bracket.

FIG. 7 relates to a third embodiment of the present invention, (a) is a plan view of a switch unit, (b) and (c) are side views and rear views thereof, and (d) is a switch fixing metal piece integrated. The front view which shows the unitary fixing metal fitting combined with, and (e) is the side view.

FIG. 8 relates to a fourth embodiment of the present invention, (a) is a plan view of a switch unit, (b) and (c) are side views and rear views, and (d) is a switch fixing bracket. A perspective view showing a single fixing member, (e) is a plan view thereof, (f)
Is a sectional view taken along line X1-X1.

FIG. 9 is a cross-sectional view showing a part of a conventional electric power tool.

FIG. 10 is a diagram of a conventional switch unit.

FIG. 11 is an assembly explanatory diagram of a conventional switch unit.

[Explanation of symbols]

 1 Housing 2'and 2 "Switch unit 4a Flange part 5 and 5'Switch cover 5a Protrusion 7 and 7'Switch fixing metal fitting 7'a Notch 7A and 7B Single fixing metal fitting 10 Groove

Claims (2)

[Scope of utility model registration request] 1. A switch unit in which a switch cover formed of a soft elastic film such as rubber covers the operation surface portion and the flange portion of a switch having a front surface as an operation surface and a flange portion on a side peripheral surface portion. While fitting the switch fixing metal fitting bent in a U-shaped cross section from above the cover to each of the pair of flange parts facing each other, the fixing metal fitting of A switch mounting structure for an electric tool, characterized in that a fitted flange portion is fitted and locked. 2. The switch cover is provided with a protrusion in an extended state at the edge of the switch cover, and the protrusion is engaged with a notch of the fixing metal fitting to prevent the fixing metal fitting from falling off. The switch mounting structure for an electric power tool according to claim 1.