JPH0664186U - Spring rod - Google Patents

Abstract

(57) [Summary] [Purpose] By changing the spring shape of the spring rod to a conical coil spring, the types of spring rods are greatly reduced. A spring rod which is used by being attached by a spring force between a can or a pair of parts of a wristwatch case, wherein a first pin 2 is fixed to the pipe 1 of the spring rod and has a conical shape. The compression spring 4 having the
The protrusion 32 of the second pin 3 is moved along the long groove of the pipe 1 according to the width of the pipe 1 by the repulsive force of the compression spring 4. [Effect] The conical compression spring makes it easy to select a spring rod for a model having a different width, and does not need to have various types of spring rod inventory.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a spring rod that is used by being attached by a spring force between a can or a pair of parts of a wristwatch case.

[0002]

[Prior art]

 Conventionally, as shown in FIG. 4, a spring rod accommodates a pair of pins 2 having a tapered portion 21 provided in a pipe 5 having a small diameter portion 51 formed by crimping at both ends. The cylindrical compression coil spring 6 was installed elastically.

[0003]

[Problems to be solved by the device]

 Since the spring rod as described above can use only a slight displacement of the spring, if the model shape of the wristwatch is different, the width of the model is different, the spring rod must be changed each time, and many types of springs are required. There was a drawback that we had to prepare the spring rod.

[0004]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention adopts a conical compression coil spring that is elastically mounted between a pair of pins provided at both ends of a spring rod pipe, and greatly increases the contact height of the spring. The size of the spring rod was reduced and the amount of movement of the pin was greatly increased to reduce the variety of spring rods.

[0005]

[Action]

 In the spring rod for a wristwatch constructed as described above, when trying to cover a rod with a small to large width, the compression coil spring in the pipe will greatly reduce the contact height of the spring. The amount of movement of the can be greatly increased, and one spring rod can be used for several models with different widths.

[0006]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. In FIGS. 1 and 2, reference numeral 1 denotes a pipe, and one end has a small diameter portion 11 by caulking, and a linear long groove 12 is provided on the outer peripheral portion from this end to the other side. Has been.

The first pin 2 is provided on the swaged side of the pipe 1, and has a base portion having an outer diameter substantially the same as the inner diameter of the pipe 1 inside the pipe 1, and the tapered portion 21 is not shown. It is thick enough to engage with the hole in the can. The second pin 3 has a cylindrical base portion having an outer diameter substantially the same as the inner diameter of the pipe 1 and a protrusion 32 provided on one side at an outer peripheral end portion which enters the pipe 1. The protrusion 32 is a pipe. It is adapted to be slidable by engaging with a long groove 12 provided in the axial direction of the outer peripheral portion, and has a tapered portion 31 on the other side, and has a thickness that engages with a hole of a can (not shown). A compression spring 4 is elastically provided between the first pin 2 and the second pin 3 in the pipe 1. The compression spring 4 is a conical coil spring and is formed in a conical shape. When the flexure is caused, the small diameter part enters the large diameter part, and when the flexion is maximized, the compression spring 4 has a value close to the wire diameter of the spring. During use, the protrusion 32 of the second pin 3 moves along the long groove 12 of the pipe 1 due to the elasticity of the compression spring 4, and can move within the range of the long groove 12 provided in the pipe 1. In the case of a model with a small can width, the compression spring 4 is bent by the amount corresponding to the can width. The end 11 of the pipe 1 is formed by caulking after assembling each component.

Although the long groove 12 is provided on the outer peripheral portion of the pipe 1 in this embodiment, it may be provided on the inner peripheral portion of the pipe 1 as shown in FIG. It may be integrally molded with the pin 3 of 2, or may be joined separately. As the conical coil spring, a bamboo spring having a rectangular cross section can be used in consideration of ease of manufacturing and durability.

[0009]

[Effect of device]

 As described above, this device has a structure in which the spring shape is simply changed to a conical coil spring or a bamboo spring, and since the spring rod pin moves significantly compared to the conventional structure, more springs with different mounting widths are used. It has the effect that it can be applied to various models and does not need to have a variety of spring rods in stock, so it can be widely used not only for wristwatches but also for roll paper support shafts.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a wristwatch spring rod according to the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is a sectional view showing another embodiment of the present invention.

FIG. 4 is a cross-sectional view of a conventional wristwatch spring rod.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 pipe 2 1st pin 3 2nd pin 4 compression spring 5 pipe 6 cylindrical compression coil spring 11,51 small diameter part 12 long groove 21,31 tapered portion 32 protrusion part

Claims (3)

[Scope of utility model registration request] 1. A pipe main body having a small diameter portion at both ends, two pins having tapered portions projecting from both ends of the small diameter portion of the pipe main body, and a base portion housed in the pipe main body. A spring rod, comprising a compression spring installed between the compression spring and the compression spring, which is a conical coil spring in which a small diameter portion enters a large diameter portion as the compression spring bends. 2. A pipe main body having a small diameter portion at one end and a long groove extending axially from the one end, and the other end being open, and a tapered portion protruding from the small diameter portion of the pipe, and a base portion. Is a first pin housed in the pipe body, and a projection provided with a tapered portion on the other end side of the pipe, the base part being slidably housed in the pipe body and engaging with the long groove. And a compression spring installed between the first pin and the second pin. The compression spring is a conical coil spring in which the small diameter portion enters the large diameter portion as it flexes. A spring rod characterized by that. 3. The spring rod according to claim 1, wherein the compression spring is a bamboo spring.