JPH022973Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field to which the invention pertains] This invention relates to a bearing structure at a rotational fulcrum when operating a lever or the like of a vacuum circuit breaker.

[Prior art and its problems]

For example, in a vacuum circuit breaker, the circuit breaker is operated by manually rotating a lever. The bearing structure of this lever will be explained based on the drawings. FIG. 5 is a front view of the conventional example, and FIG. 6 is a side view as viewed from arrow Q in FIG. In order to construct a bearing on the frame 1, the bottom part 2a of the support 2 made of a band-shaped plate bent into a U-shape is fixed to the frame 1 with screws, and the fulcrum pin 3 is inserted into the hole provided in both legs 2b of the support 2. is passed through together with the lever 4 inserted between both legs 2b, and both ends of the fulcrum pin 3 are fixed with split pins 5 or C rings (not shown) to prevent the fulcrum pin 3 from coming off in the axial direction. This structure allows the lever 4 to freely rotate around the fulcrum pin 3, thereby forming a bearing section.

However, with this structure, in order to prevent the fulcrum pin from coming off, both ends of the fulcrum pin must be processed by drilling, grooving, etc., resulting in the problem of high processing and assembly costs. Furthermore, due to the shape of the rotating lever, the fulcrum of the bearing had to be separated from the frame, making the legs of the support long and large, requiring a large space.

[Purpose of invention]

In view of the above-mentioned problems, this invention does not require the processing and assembly of the fulcrum pin as described above,
Moreover, the purpose is to provide a bearing structure that can fit in a small space.

[Key points of the idea]

In order to achieve the above objective, this invention provides a square hole in the frame with a width slightly larger than the dimension between the outer sides of both legs of the support, and a fulcrum that passes through both legs of the support and the lever on both sides of the cut of this square hole. This prevents the pin from coming off in the axial direction.

[Example of idea]

An embodiment of the present invention will be explained based on FIGS. 1 to 4. 1 is a front view, FIG. 2 is a perspective view of the support, FIG. 3 is a side view taken along the arrow P in FIG. 1, and FIG. 4 is a sectional view taken along the line AA in FIG. 1. The frame 11 has a square hole 1 having a width W ₁₁ that is slightly larger than the outer side dimension W 12 of both legs 12a of the support 12 _, which will be described later.
1a and a support mounting screw hole 11.
b. The support 12 attached to this square hole 11a has the shape shown in the perspective view of FIG. That is, cut out the part that will become the letter-shaped leg part 12a, and bend it so that the tip thereof extends downward from the bottom part 12b.
Through-holes 12c are provided in both parts extending downward so that they overlap with both sides of the cut side of the square hole 11a when attached to the frame 11.
The width dimension of the square hole 11a is set in the through hole 12c of the support 12 which has the tightening bolt hole 12d in the bottom part 12b.
A fulcrum pin 13 with a length equal to W ₁₁ is passed through together with the lever 14, and these members are inserted into the bolt 15 from the tightening bolt hole 12d in the bottom 12b of the support 12.
is inserted and screwed into the screw hole 11b of the frame 11 to be fixed. When assembled in this way, the lever 14 can freely rotate around the fulcrum pin 13, thereby forming a bearing section. The fulcrum pin 13 is obstructed by the cut side surfaces (plate thickness portions) of the square hole 1a and does not come out in the axial direction, so there is no need to fix it. Also, since the center of rotation is near the frame 11, there are fewer parts protruding from the frame 11,
The only space required is the operating range of the lever 14, and the space can be reduced. In addition, the width dimension W ₁₁ of the square hole 11c and the support 12 leg part 12a
By making the outer dimensions W ₁₂ of the support 12 substantially equal, rotation of the support 12 can be prevented at both cut end faces of the square hole 11a, so it is sufficient to fix the bottom portion 12b in one place (151 bolts).

[Effect of idea]

According to this invention, the rotational fulcrum of the bearing is placed at a position where it wraps with the thick plate of the frame, and both ends of the square hole provided in the frame are designed to prevent the fulcrum pin from falling off, eliminating the need for machining the fulcrum pin and assembling it. Costs can also be reduced. In addition, by making the width of the square hole in the frame and the dimensions of the outer surfaces of both legs of the support almost the same, the support can be prevented from rotating at the same time on both end faces of the square hole, so only one mounting bolt is required at the bottom of the support. The cost of drilling, threading and assembly of the support bottom and frame can be reduced. Furthermore, by locating the rotational fulcrum near the end surface of the square hole cut of the frame, the protrusion from the frame surface is reduced, making it possible to reduce the required space.

[Brief explanation of drawings]

Fig. 1 is a front view of an embodiment of this invention, Fig. 2 is a perspective view of the support, Fig. 3 is a side view taken along arrow P in Fig. 1, and Fig. 4 is a cross section taken along arrow A-A in Fig. 1. 5 is a front view of the conventional example, and FIG. 6 is a side view taken in the direction of arrow Q in FIG. 11: Frame, 11a: Square hole, 12: Support, 12a: Leg, 12b: Bottom, 13: Fulcrum pin, 14: Lever, W ₁₁ : Width dimension of square hole, W ₁₂ :
Dimension between the outer sides of both legs.

Claims (1)

[Scope of utility model registration request] The bottom part of the U-shaped support is screwed and fixed to the frame, a lever is inserted between both legs of the support, and a fulcrum pin is passed through both legs of the support and the lever to form a bearing part. In this case, a square hole is provided in the frame with a width slightly larger than the outer dimension between the legs of the support, and both cut ends of the square hole are used to prevent the fulcrum pin from coming off in the axial direction, which passes through both legs of the support and the lever. The bearing structure of the rotating fulcrum is characterized by: