JPS6240783Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a support device for supporting a switch lever that opens and closes the electrical contacts of a portable power tool, such as a hedge trimmer used for trimming hedges. The object of the present invention is to provide a support device for a switch lever in a power tool that can simplify the support mechanism of the switch lever and reduce costs, as well as enable accurate operation of the switch lever.

Next, an embodiment in which the present invention is applied to a hedge trimmer will be explained with reference to the drawings.
Reference numeral 1 denotes a housing of the hedge trimmer main body H, and inside thereof there are installed an electric motor, a drive mechanism, etc. for driving a blade (not shown) that is supported laterally on the lower end of the housing 1 and reciprocated in the front and back direction. is stored, while the rear end has grip 1.
A is integrally extended laterally, and a main switch 2 for opening and closing a main contact connected to an electric motor is attached to the lower base end of the grip 1a.

Reference numerals 3, 3 denote a pair of lower support pieces provided on the upper surfaces of the left and right ends of the upper end portion 1A of the housing 1,
On the upper surface thereof, a lower guide surface 4 having a convex arc surface with a radius _r1 and an arc center at O is formed.

Reference numeral 5 denotes a handle mounted on the upper end portion 1A of the housing 1, and includes a base portion 6 that is fastened to the upper end portion 1A via screws 8 and covers the same portion 1A, and a handle on both sides of the base portion 6. The upper end portion 1A is integrally connected to the upper end portion 1A so as to extend forward, and has a substantially C-shaped plane and a mold-shaped cross section. A pair of left and right upper support pieces 9 , 9 are provided on the lower surface near the left and right ends of the housing 1 in a downwardly protruding manner, facing the lower support pieces 3 of the housing 1 . An upper guide surface 10 having a concave arc surface with a radius r ₂ with O as the arc center is formed on each of the upper guide surfaces 10 to be concentrically opposed to the lower guide surface 4, and a stopper 11 is provided on the lower surface near the rear end of the base 6. is installed protrudingly.

Reference numeral 12 denotes switch levers arranged in parallel with each other so as to be tiltable on the lower side of the handle 5. The main switch levers 12 have a substantially C-shaped plane and a mold-shaped cross section so as to be able to fit into the grip portion 7 of the handle 5. Piece 13 and this main piece 13
The connecting piece 14 is provided opposite to the stopper 11 in order to connect the base ends 13a of the main piece 13 and to come into contact with the stopper 11 of the handle 5 to restrict the swinging range of the switch lever 12. Both base ends 13a
The left and right parts 1 are respectively held between the upper support pieces 9 of the handle 5 and the lower support pieces 3 of the housing 1.
A pair of receiving pieces 15, 15 are respectively projected inward, and an upper support piece 9 is provided on the upper surface of both receiving pieces 15.
The upper sliding surface 16 that is slidably brought into close contact with the upper guiding surface 10 is formed in the shape of a convex circular arc with a radius _r2 , while the lower surface of both receiving pieces 15 is provided with the lower guiding surface of the lower supporting piece 3. A lower sliding surface 17, which is slidably sealed against the surface 4, is concentric with the upper sliding surface 16 and is formed in a concave arc shape with a radius _r1 , and is located near the front end of the handle 5 and the switch lever 12. When the switch lever 12 is tilted upward by grasping the front end and lifting the front end, the switch lever 12 moves against the vertical sliding surfaces 16 and 17.
It is guided by the upper and lower guide surfaces 4 and 10 via the guide surfaces 4 and 10, and is moved in an arc with the arc center O as a fulcrum.

18 is the front end of the handle 5 and the switch lever 12
The suspension switch is interposed between the front end of the main switch 2 and has an auxiliary contact connected in series with the main contact of the main switch 2, and the switch lever 12 is tilted upward with the main contact closed to perform auxiliary operation. When the contacts are closed, the electric motor is activated, while
When the switch lever 12 is released, the switch lever 12 is tilted downward by the elastic force of a spring 19 built into the switch lever 12 and automatically returns to its original position, and the auxiliary contact is opened to stop the electric motor.

Next, the operation and effects of the embodiment having the above configuration will be explained.

Now, in this example, both receiving pieces 15 provided on the switch lever 12 installed in parallel with the handle 5 are attached to the housing 1.
The switch lever 1 is sandwiched between a lower support piece 3 provided on the handle 5 and an upper support piece 9 provided on the handle 5.
2 are upper and lower guide surfaces 10 and 4 formed in a concave and convex circular arc shape concentric with the upper and lower support pieces 9 and 3, and receiving pieces that are brought into close contact with the upper and lower guide surfaces 10 and 4 so that they can slide, respectively. It is configured to be tiltably supported via upper and lower sliding surfaces 16 and 17 formed in concave and convex arcuate shapes concentric with the upper and lower surfaces of 15.

Therefore, when the handle 5 is attached to the upper end 1A of the housing 1, the switch lever 12 can be easily assembled between the upper end 1A and the handle 5 and supported in a tiltable manner.
It is possible to simplify and rationalize the assembly work by reducing the number of steps and materials required for assembling the switch lever 12, and also to connect the switch lever 12 to the upper and lower guide surfaces 10, 4 and the upper and lower sliding surfaces 1.
The surface contact with the switch levers 6 and 17 allows accurate circular movement, which has the advantage of preventing erroneous operations due to loose movement when the switch lever is tilted, and making the opening/closing operations of the electrical contacts more accurate over time.

That is, in the present invention, a switch lever is installed in the housing in order to tiltably support the switch lever, which is arranged in parallel to open and close the electrical contact with respect to the handle fixed to the housing of the power tool, near the base end thereof. A receiving piece is provided between the lower supporting piece and the upper supporting piece provided on the handle opposite to the lower supporting piece, and the upper supporting piece is attached to the upper and lower surfaces of the receiving piece. The upper guide surface is formed in an arc shape with respect to the lower surface, and the lower guide surface is formed in an arc shape with respect to the upper surface of the lower support piece and is concentrically opposed to the upper guide surface. By forming the upper and lower sliding surfaces that are in close contact with each other in a concentric arc shape, the switch lever can be easily assembled and the operation of the switch lever can be made more accurate, so it can be used as a support device for the switch lever in power tools. This is an extremely practical idea.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a partially cutaway side view of the main part, and FIG.
An X-ray cross-sectional view, Figure 3 is a back view of the handle, Figure 4 is a Y-Y cross-sectional view of Figure 3, Figure 5 is a plan view of the switch lever, and Figure 6 is a Z-Z line of Figure 5. FIG. DESCRIPTION OF SYMBOLS 1...Housing, 3...Lower support piece, 4...Lower guide surface, 5...Handle, 9...Upper support piece, 10
...Upper guide surface, 12...Switch lever, 15...
Receiving piece, 16, 17...sliding surface.

Claims (1)

[Scope of utility model registration request] Near the proximal end of the switch levers arranged in parallel to open and close electrical contacts for the handle fixed to the housing of the power tool, there is a lower support piece provided on the housing to support the switch levers in a tiltable manner. A receiving piece is provided opposite to this lower supporting piece and is sandwiched between an upper supporting piece provided on the handle, and the upper and lower surfaces of this receiving piece have an arcuate surface relative to the lower surface of the upper supporting piece. The upper guide surface is formed in a shape of a shape, and the lower guide surface is formed on an arcuate surface with respect to the upper surface of the lower support piece and is concentrically opposed to the upper guide surface. A support device for a switch lever in a power tool, characterized in that upper and lower sliding surfaces are formed in a concentric arc shape.