JPS5936747Y2 - Coil spring mounting seat - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a coil spring mounting seat that facilitates the removal of the coil spring.

Generally, the mounting seat for a coil spring has a structure in which both ends of the coil spring are fitted into protrusions or recesses provided in a seat body into which both ends of the coil spring are received.

For example, in cam contactors for opening and closing electric circuits,
The structure of a conventional spring mounting seat will be explained with reference to the drawings.

Figure 1 shows a conventional cam contactor.
is a cam, and this cam 1 has cam ridges 1a and cam valleys 1b on its circumferential surface.
It is configured to rotate by being connected to a shaft directly connected to an operating mechanism (not shown).

Further, an insulating stand 2 is provided above the cam 1, and a bearing stand 3 and a fixed contact support 4 are fixed to the lower part of the insulating stand 2, respectively.

Furthermore, a hinge pin 5 is provided at the lower end of the bearing stand 3,
A central portion of a lever 6 is rotatably supported on the hinge pin 5.

Further, a roller 7 is pivotally supported at one end of the lever 6, and a coil spring 8 is mounted between the upper part of the lever 6 and the bearing stand 3.
is attached, and the lever 6 is always biased in the direction of arrow A to press the roller 7 so as to roll around the cam 1.

When the mounting portion of the coil spring 8 is shown enlarged in FIG. 2, a mounting seat main body 9 is integrally formed at one end of the lever 6.
A cylindrical projection 9a is provided on its upper surface, and the end of the coil spring 8 is fitted into and supported therein.

In this cam contactor, a coil spring 8 causes a roller 7 to roll while being pressed against the circumferential surface of the cam 1 at all times, and when the roller 7 is positioned on the cam crest 1a as shown in FIG. and the movable contactor 12 are separated, and the electric circuit is interrupted.

Further, when the cam 1 rotates and the roller 7 is located in the cam valley 1b, the lever 6 rotates counterclockwise, the movable contact 12 is pressed against the fixed contact 13 and electrically connected, and the current flows through the shunt 16. It is designed to flow from the terminal 15 to the terminal 14 via the terminal 15.

In this way, the cam contactor has a movable contact 12 and a fixed contact 1.
A high-pressure spring is used to create a large contact pressure between the coil spring 8 and the lever 6, and the coil spring 8 is fitted into the protrusion 9a of the mounting seat body 9 of the lever 6 and tightly contacts the surface of the lever 6. ing.

For this reason, with conventional spring mounting seats, it is difficult to insert a removal tool when removing the coil spring 8 during maintenance or disassembly of the cam contactor, and the end of the coil spring is often damaged by the removal tool. there were.

The present invention was conceived in view of the above, and an object of the present invention is to provide a spring mounting seat that facilitates the removal of the spring.

The present invention will be explained in detail below with reference to the drawings.

FIG. 3 shows an embodiment in which the present invention is applied to a coil spring mounting portion of a cam contactor, and is a perspective view showing the mounting seat of the coil spring 8.

Note that the other parts except the mounting seat have the same structure as shown in FIG. 1, so the explanation thereof will be omitted.

As shown in FIG. 3, the mounting seat for the coil spring 8 is provided with a cylindrical protrusion 9a on the upper surface of the mounting seat main body 9 formed at one end of the lever 6. The protrusion 9a and the mounting seat body 9 extend along the radial direction so that the
A cut groove 17 is formed in.

The outer diameter of the protrusion 9a is slightly smaller than the inner diameter of the coil spring 8, and the end of the coil spring 8 fits on the outside of the protrusion 9a to support and fix the coil spring 8. .

Further, the width of the cut groove 17 is slightly wider than the width of the tip 19 of the removal tool 18 such as a flathead screwdriver.

Therefore, when removing the coil spring 8 from the state in which the coil spring 8 is fitted and attached to the protrusion 9a, the coil spring 8 can be easily removed by inserting the tip 19 of the removal tool 18 into the cut groove 17 and lifting it. 8 can be removed.

Furthermore, even when the coil spring 11 is attached by fitting into the four parts 20a of the mounting seat body 20 of the movable contact support 10 as shown in FIG. 4, the cut groove 21 may be provided as shown in FIG. This makes it easy to remove the coil spring 11.

Although the above embodiments show examples in which the coil is applied to a spring attachment part of a cam contactor, the relatively small coil can also be applied to various devices using springs.

As explained above, according to the present invention, since the cut groove for inserting the tip of the removal tool into the protrusion and recess of the mounting base body into which the end of the coil spring fits, maintenance and disassembly of the device are possible. In this case, the coil spring can be easily removed without forcing the tip of the removal tool, and workability can be significantly improved compared to the conventional structure.

[Brief explanation of the drawing]

Fig. 1 is a front view showing the overall structure of the cam contactor, Fig. 2 is a perspective view showing a conventional coil spring mounting seat, Fig. 3 is a perspective view showing an embodiment of the present invention, and Fig. 4 is a perspective view showing the conventional coil spring mounting seat. FIG. 5 is a perspective view for explaining another embodiment of the present invention. 8.11... Coil spring, 9,20...
・Mounting seat body, 9a...Protrusion, 17.21・
...kerf, 18...removal tool.

Claims (1)

[Scope of utility model registration request] The mounting seat body that receives the coil spring has a protrusion into which the end of the coil spring fits into the mounting seat body, and the distal end of the removal tool is inserted into the protrusion and the mounting seat body. A coil spring mounting seat characterized in that a concave cut groove is formed in the diameter direction of the coil spring.