JPS5824012Y2 - Crank lever connection structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a structure for pivotally connecting a crank lever to a pivot.

Conventional examples of such a connection structure are shown in FIGS. 1a and 1b.
As shown in the figure, a fitting hole 02 is formed at the connecting end of the crank lever 01, and a pivot (crank pin) 05 fitted into the fitting hole 04 of another similar crank lever 03 is inserted into the fitting hole 02 of the crank lever 01. It is fitted into the insertion hole 02, and then the head of the pivot shaft 05 is connected by caulking as shown by reference numeral 06.

Therefore, in such a conventional structure, since a caulking means is required, the assembly work is quite troublesome and takes a lot of time.Furthermore, since the caulking structure is adopted, the crank lever 01 and the pivot shaft 05 are made of metal instead of synthetic resin. If you try to mold the pivot 05 integrally with the other crank lever 03 in order to reduce the number of parts, this crank lever 03 will also have to be made of metal, which increases the cost. If the crank lever 03 were to be made of synthetic resin due to cost considerations, there would be an inconvenience that the number of parts would increase because the pivot could not be integrally molded.

The present invention has been made in order to eliminate such conventional inconveniences.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

According to the present invention, as shown in Fig. 2a, a slit 2 is formed at the connecting end of the crank lever 1 to divide the connecting end into two in the longitudinal direction, and a fitting hole 3 is further formed in the middle of the slit 2. At the same time, a stress absorbing hole 4 is formed at the base of the slit 2.

Therefore, the connecting end of the crank lever 1 having such a structure is shown in FIGS. 3a, 3b, and 3c.
If you press the open end of the slit 2 against the pivot 6,
The connecting end of the crank lever 1 is elastically opened on both sides through a slit 2, and its fitting hole 3 is fitted into the pivot shaft 6.

This connection is shown in FIG. 2b.

In this case, the stress generated when the crank lever is opened in both directions is concentrated at the root of the slit 2, but is absorbed by the absorption hole 4 formed in this portion, so that the crank lever 1 does not crack.

Preferably, as shown in the figure, the portion of the slit 2 that opens at the end of the connecting end of the crank lever 1 is shaped into a V-shaped notch 7 that expands outward, and this notch 7 It is preferable to guide the crank lever 1 so that the crank lever 1 can be easily opened in both directions.

As described above, according to the present invention, no caulking means is required to connect the crank lever 1 to the pivot shaft 6, and the resiliency of the crank lever can be used to connect the crank lever 1 to the pivot shaft 6 with almost a single touch. It is extremely simple and can significantly reduce the time required compared to conventional methods.

Further, according to the present invention, since the caulking structure as described above is not adopted, both the crank lever 1 and the pivot shaft 6 can be molded from a synthetic resin material instead of a metal material, which reduces cost. It has the advantage that it can be manufactured at low cost and that the number of parts can be reduced by integrally molding the pivot shaft 6 and the other crank lever 8 from synthetic resin or metal as shown in FIG. 2b.

Next, another embodiment of the present invention will be described.

In FIGS. 4a to 4c, the center of the connecting end of the crank lever 1 is projected, and this portion 10 is also divided into two by a slit 2, and the opening of this slit is a notch 7 shaped like a letter . It is formed.

Then, by pressing the connecting end of the crank lever 1 so that the V-shaped notch 7 of the slit 2 abuts against the pivot shaft 6 and elastically opening both sides, the fitting hole 3 is fitted into the pivot shaft 6, and then A pair of guide pins Ila and 11b sandwich the center projecting portion 10 of the tip of the crank lever 1 divided into two to eliminate the gap in the slit 2, and in this state, the portion of the slit 2 is marked with reference number by the two pairs of heating electrodes 12a and 12b. 1
Weld as shown in 3.

In this way, insert the fitting hole 3 of the crank lever 1 into the slit 2.
By fitting the crank lever 1 into the pivot shaft 6 via the slit 2 and then welding the distal end portion of the slit 2, it is possible to completely prevent the crank lever 1 from coming off the pivot shaft 6.

. Next, a case will be described in which the crank lever connection structure according to the present invention is applied to the crank mechanism of a gas meter.

This type of crank mechanism converts reciprocating motion into rotational motion, and generally consists of a pair of small armrests, as shown in Figure 5.
21,022, a pair of connecting rods 023.024, a pair of connecting rod shafts 025.026, and a solid shaft 027.

Conventionally, all of these parts are molded independently, and the assembly is performed by inserting a solid shaft 027 into a fitting hole 023a at one end of a connecting rod 023, as shown in FIGS. 6a to 6d. The ends of this solid shaft are connected by caulking as indicated by reference numeral 028 (see Figure 6a), and then the connecting rod shaft 0. ．． 25 into the fitting hole 023b at the other end of the connecting rod 023 and crimping the insertion end of this shaft 025 to connect it.
25, and the other end of this connecting rod shaft 025 is connected by caulking as shown by reference number 029 (see Figure 6c), and finally inserted into the fitting hole 22a at one end of the small armrest 022. The connecting shaft 026 is inserted into the fitting hole 023b at the other end of the connecting rod 023.
The insertion end of the connecting rod shaft 026 is caulked to connect the connecting rod shaft 026 (see Fig. 6d).

In addition, in the crank mechanism assembled in this way, as is well known, the small armrests 021 and 022 are connected to the pair of blade shafts that swing in response to the expansion and contraction of the metering membrane, respectively, via the large armrests. Furthermore, the connecting rod shaft 026 moves circularly around the solid shaft 027 to rotate the rotary valve, and the solid shaft 027 further rotates around its axis to drive the totalizer.

Therefore, in this conventional example, the number of independently molded parts is seven, which is a relatively large number, and four crimping operations are required to connect these parts, making the assembly work difficult. However, there are problems in that it is quite complicated and takes a lot of time.

6 However, if the above-described crank lever connection structure according to the present invention is adopted, as shown in FIGS. 7a to 7c, a pair of connecting rods 23 and 24 and two pairs of connecting rod shafts 25
．． 26 and a solid shaft 27 are integrally molded from synthetic resin or metal material (see Fig. 7a), and the connecting rod shafts 25, 26 of this molded body are fitted with a pair of small elbows 21.26 having a shape according to the present invention. 22 are connected to each other (Section 7b)
and Figure 7c), the number of parts is reduced to 3, and these parts can be connected with one touch without using caulking means, making assembly work extremely simple, greatly shortening the time, and reducing costs. It is also possible to aim for

[Brief explanation of drawings]

Fig. 1a is a plan view of a conventional crank lever, Fig. 1b is a sectional view showing the conventional crank lever connected to a pivot, Fig. 2a is a plan view showing an example of the crank lever according to the present invention, and Fig. 2b is a plan view of a conventional crank lever. The figure is a cross-sectional view showing the crank lever of the present invention connected to the pivot; Figures 3a, 3b and 3c are views showing the process of connecting the crank lever of the present invention to the pivot; Figure 4b-1, Figure 4b-2, Figure 4cm1, and Figure 4cm2 are diagrams showing the process of connecting and welding another type of crank lever according to the present invention to the pivot, and Figure 5 is a diagram showing a conventional gas meter crank. Figures 6a, 6b, 6c and 6 showing the mechanism exploded
Figure 7a is a diagram showing the assembly process of a conventional crank mechanism.
7b and 7c are diagrams showing the assembly process of applying the present invention to a crank mechanism of a gas meter. 1... Crank lever, 2... Slit, 3...
Fitting hole, 4... Stress absorption hole, 6... Pivot.

Claims (1)

[Scope of utility model registration request] In a structure in which a crank lever is pivotally connected to a pivot, the connecting end of the crank lever has a slit that divides the connecting end into two in the longitudinal direction, a fitting hole formed in the middle of the slit, and a base of the slit. A crank lever connection characterized in that the connecting end of the crank lever is elastically opened both ways through the slit and the fitting hole is fitted into the pivot shaft. structure.