JPS5841873B2 - Fittings for electric razors - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a bushing portion 2 connected to a motor shaft 1 and a drive shaft 4 connected to an inner cutter drive shaft 3 for power transmission and for applying contact pressure of the inner cutter to the outer cutter. The present invention relates to a joint for an electric razor, characterized in that it is integrally molded from synthetic resin via a spring body 5 which also serves to push up the blade.

The purpose is to reduce the number of parts,
To provide a fitting for an electric razor that can be made compact.

Conventionally, as a joint that pushes up the inner cutter 8 of an electric razor and transmits the rotation of the motor shaft 1 to the inner cutter 8, a bushing part 9 connected to the motor shaft 1 is fitted into the inner diameter of a drive bushing 10 and the inner cutter is driven. A drive shaft 11 connected to the shaft 3 is engaged with the drive bush 10, and a spring 1 is inserted into the drive bush 10.
2 is used to push up the bottom surface of the drive shaft 11 with a spring 12.

However, such a joint requires four separate parts: the bushing part 9, the drive bushing 10, the drive shaft 11, and the spring 12.The number of parts is large and it takes time to assemble. Because the spring 12 is fitted into the bushing portion 9 and the spring 12 is interposed within the drive bushing 10, the joint must be made large.

Sliding friction is likely to occur between the spring 12 and other members, which is particularly likely to be a factor that hinders smooth vertical movement of the drive shaft.

The present invention solves these conventional drawbacks, and will be explained in detail below with reference to the illustrated embodiments.

In the illustrated example, the bushing part 2, the drive shaft 4, and the spring body 5 are integrally molded from synthetic resin, the bushing part 2 is cylindrical, and the inner diameter a of the spring body 5 is The inner diameter is smaller than that of No. 2.

Such a joint is formed, for example, by using a mold consisting of a fixed mold and a movable mold, forming a cavity between the fixed mold and the movable mold, and pouring molten synthetic resin into the mold.

If the inner diameter a of the spring body 5 is made smaller than the inner diameter of the bushing part 2 as in this embodiment, it will be easier to pull out the side core from the bushing part 2 side after molding.

In the above joint, the bushing part 2 is fitted to the motor shaft 1 of the motor 7 built in the electric razor body 6, and the drive shaft 4
is connected to the inner blade drive shaft 3 and mounted on the electric razor body 6.

Thus, the motor 7 is rotated and the driving force is transmitted to the bushing part 2 via the motor shaft 1, and the driving force transmitted from the bushing part 2 to the drive shaft 4 via the spring body 5 is transmitted to the inner cutter 1 drive shaft 3. is transmitted and rotates the inner cutter 8.

At this time, the spring body 5 has the function of transmitting the driving force and also has the function of pushing the inner cutter 8 upward by its spring elasticity.

In another embodiment shown in FIG. 6, the bushing portion 2 and the drive shaft 4 are integrally molded from synthetic resin through a metal spring body 5, and both ends of the spring body 5 are They are embedded in opposing ends of the bushing portion 2 and the drive shaft 4, respectively.

In the present invention, as described above, the bushing part and the drive shaft are integrally shaped via the spring body, so the joint is integrated, reducing the number of parts and making it easy to assemble the electric razor. , which can shorten assembly time.
Cost can be reduced.

Furthermore, since there is no driving bush as in the conventional art, the joint can be made smaller and more compact.

Moreover, the inner diameter and outer diameter of the spring body can be changed arbitrarily, and there is an advantage that the push-up load of the spring body can be changed easily compared to conventional joints.

In addition, there is no sliding friction between the spring body and the bushing or drive shaft, so power is transmitted smoothly and the vertical movement of the drive shaft, and in other words, the vertical movement of the inner cutter, is smooth as well. be.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view of the conventional example, Fig. 2 is a cross-sectional view of the main part of the same as above, Fig. 3 is an overall perspective view of an embodiment of the present invention, and Fig. 4 is a longitudinal cross-section of an embodiment of the present invention. FIG. 5 is a sectional view of the main part of the same as above, and FIG. 6 is a sectional view of the main part of another embodiment of the present invention. In the figure, 1 is the motor shaft, 2 is the bushing part, 3 is the inner blade drive shaft,
4 is a drive shaft, and 5 is a spring body.

Claims (1)

[Claims] 1 The bushing part connected to the motor shaft and the drive shaft connected to the inner cutter drive shaft are connected using a synthetic resin via a spring body that serves both for power transmission and for pushing up the inner cutter to apply contact pressure of the inner cutter to the outer cutter. A joint for electric razors that is characterized by being integrally molded and cut.