JPH056562Y2 - - Google Patents

Description

[Detailed explanation of the idea] (Industrial application field) The present invention relates to a tone arm.

(Prior Art) Conventionally, various tone arms have been provided, but
These generally have a structure in which a head shell for mounting a cartridge is attached to one end of a pipe with a screw or the like, and the vicinity of the other end of the pipe is rotatably supported via an arm base. In this case, the pipe is made of aluminum or the like separately from the head shell and the arm base which is pivotally supported by the arm base, and the tone arm is formed as a whole by assembling each part integrally. However, this method has disadvantages such as increasing the cost of the pipe and the assembly cost of the tone arm as a whole, making it impossible to provide an inexpensive product, and making the assembly process complicated.

(Purpose of the invention) This invention was proposed in view of the above drawbacks.
The purpose of this is to form a tone arm body by integrally molding the half of the pipe with the head shell and arm base from plastic.
The object of the present invention is to provide a tone arm whose structure and assembly work can be simplified and costs can be reduced by joining and integrating the other half of the pipe, which is also made of plastic.

(Structure of the idea) The present invention will be explained below with reference to the drawings.

First, the present invention combines a tone arm body 1 made of integrally molded plastic and a pipe half body 2 as described below.

That is, FIG. 1 shows a tone arm main body 1, and this tone arm main body 1 has a first pipe half 1a having a substantially semicircular cross section as shown in FIG.
, a head shell 1b integrally formed at one end of the pipe half 1a, and an arm base 1c integrally formed at the other end of the pipe half 1a. Here, a bracket 4 for attaching a cartridge 3 can be attached to the lower surface of the head shell 1b, as shown in FIG. The arm base 1c is formed into a substantially box shape, and shaft supports 1c' for receiving both ends of a shaft supported by an arm base (not shown) are formed at opposite positions on the side walls thereof. ing.

Next, FIG. 2 shows a second pipe half 2 which is superimposed on and joined to the first pipe half 1a and is fixed to the first pipe half 1a.
It shows. This pipe half 2 is also integrally molded from plastic like the tone arm main body 1, and the cross-sectional shape of its main part is approximately the same as that of the first pipe half 1a, as shown in FIG. 2D. It has a semicircular shape, and its outer shape is symmetrical to the first pipe half 1a, and by combining this second pipe half 2 with the first pipe half, a cylindrical pipe is constructed. ing.

When assembling, the side edges of the first pipe half 1a and the second pipe half 2 are overlapped to form a cylindrical pipe as a whole, as shown in FIG. They may be connected and integrated using the method described in the following.

(Effects of the invention) As described above, according to the invention, there is a first pipe half having a substantially semicircular cross section, a head shell attached to one end of the first pipe half in the length direction, and a head shell attached to one end of the first pipe half in the longitudinal direction. A tone arm main body having an arm base attached to the other end in the length direction of the half is integrally molded from plastic, and a second pipe half made of plastic and having a substantially symmetrical shape with the first pipe half. Since the pipe half is joined to the first pipe half to form a cylindrical pipe, it is easier to mold the plastic in one piece than the conventional method of forming pipes made of metal etc. separately and assembling them. It is possible to reduce costs, and it also has effects such as reducing the weight of the tone arm and improving its strength.

Further, during assembly, there is no need for the trouble of individually attaching the head shell and arm base, and it is only necessary to join the second pipe halves, so there is an advantage that assembly costs can be reduced.

In this case, the lead wire from the headshell is led out to the arm base side, but if it is shaped like a pipe in advance, the work of inserting the thin and flexible lead wire is very complicated, but in this application, the pipe is in half, so The lead wire can be easily run along the open recess, and there is no need to install the head shell or arm base, and this work is also easy to perform, making assembly easier overall. In good condition.

[Brief explanation of the drawing]

Figure 1 shows the main body of the tone arm; Figure 1 is a plan view, Figure 1 is a side view, Figure 1 is a cross-sectional view, Figure 1 is a bottom view, Figure 1 is an enlarged sectional view taken along A-A of Figure 1; Second
The figures show the second pipe half: A is a plan view, B is a side view, C is a bottom view, D is an enlarged sectional view taken along B-B of A, and Fig. 3 is in use. FIG. 1... Tone arm body, 1a... First pipe half, 1b... Head shell, 1c... Arm base, 2... Second pipe half.

Claims (1)

[Scope of utility model registration request] A first pipe half having a substantially semicircular cross section, a head shell attached to one end of the first pipe half in the length direction, and a head shell attached to the other end of the pipe half in the length direction. A tone arm body including an arm base is integrally molded from plastic, and a second pipe half made of plastic and substantially symmetrical to the first pipe half is joined to the first pipe half. A tone arm characterized in that a cylindrical pipe is formed.