JPS6338498Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a winding structure for a mainspring spring used in a spring operating mechanism such as a switch.

The spring operation mechanism uses a clockwork spring as the main operation spring to store energy, and uses this rotational force to close or trip a switch or the like.

This mainspring spring has the disadvantage that it does not fit in with the central axis because it is not concentric but spiral shaped.

FIG. 1 shows an example of a conventional structure, in which a central shaft 1 is provided with a cut portion 1a in the longitudinal direction of the shaft, into which the inner end of a mainspring spring 2 is inserted.

A portion of the first turn of the mainspring spring 2 is annealed to improve its conformity to the central shaft.

However, since the curvature changes suddenly at section A, which moves from the first turn to the second turn, stress is concentrated there.

This caused the mainspring spring to have a short lifespan far from the lifespan estimated by the Weibull distribution.

The present invention has been proposed to solve these conventional problems, and embodiments thereof will be described below with reference to FIG. 2 and subsequent figures.

In FIG. 2, reference numeral 3 denotes a central shaft, and as in the case of FIG. 1, a cut portion 3a is provided in the longitudinal direction of the shaft, into which the inner end of the mainspring spring 4 is inserted.

A second cut portion 3b is provided at a position advanced by an appropriate angle (120° in the case of a hexagonal shaft) in the winding direction of the mainspring spring 4 from the position of the cut portion 3a.

One end of the spacer 5 is inserted into the second cut portion 3b.

The spacer 5 is made of a plate made of a material that is easily compatible, such as non-ferrous metal, and has the same thickness and width as the mainspring spring 4.

The spacer 5 can be installed by inserting it into the cutout 3b of the central shaft 3 as shown in FIG.
The inner end of the spacer 5 may be riveted (not shown). That is, the inner end of the spacer 5 only needs to be locked to the outer circumference of the central shaft 3.

In addition, the length of the spacer 5 is approximately
The dimensions are such that they can touch each other at 230 degrees, and the dimensions are such that they can be wound between the central shaft 3 and the mainspring spring 4 at the longest.

Also, the center 4 of the first half turn of the mainspring spring 4
c is the center 3c of the central shaft 3 and the mainspring spring 4
is eccentric by half the thickness of .

In the figure, the center axis is hexagonal because
A hexagonal member is used to connect the center shaft to a load so that it can be used as a drive shaft.

A round material may be used instead of a hexagonal material, and only the portion used as the drive shaft may be processed into a square shaft.

Incidentally, from the viewpoint of not making a sudden change in the radius of curvature by adding a step to the overlapping part of the first turn and the second turn of the mainspring spring, it is also possible to use a central axis having a shape as shown in FIG. 3. That is, one side (B
If you cut off the spacer 8 and create a step, there will be no strain between the first turn and the second turn.
The length of can be made shorter than that shown in FIG.

Note that 8a is a cutout for attaching the spacer 8.

In this case as well, a difference of t/2 is provided between the center 6c of the central axis 6 and the center 2c of the first turn, where t is the thickness of the spacer 8.

By winding the spacer of this invention into the mainspring, it becomes easier to adapt to the cycloid curve when winding the mainspring, and stress concentration can be prevented.
This has the advantage that the life of the mainspring can be extended.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing a conventional example, FIG. 2 is an explanatory diagram showing an embodiment of the present invention, and FIG. 3 is an explanatory diagram showing another embodiment. In the figure, 3 is the central axis, 4 is the main spring, and 5 is the central axis.
is a spacer.

Claims (1)

[Scope of utility model registration request] A spacer is interposed at the outer periphery of the central shaft where the inner end of the mainspring spring is locked and along the inside of the mainspring spring, and the spacer is inserted at an appropriate angle along the mainspring from the locking position of the inner end of the mainspring spring. one end of the spacer is locked to the outer periphery of the central shaft at the advanced location, and the other end of the spacer is interposed between the central shaft and the mainspring spring,
A winding structure for a mainspring spring, characterized in that the spacer is wound together with the mainspring spring.