JPH0110015Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a mounting device for an adjustment shaft such as a tuning shaft for radio tuning. In other words, the adjustment shaft is rotatably supported, and the adjustment shaft is rotated relative to a support panel such as a chassis. The present invention relates to a mounting device for freely fixing.

The conventional mounting device has a flange at one end, the tip of the adjustment shaft passes through a metal holding cylinder with a male thread on the outer periphery, and a C-shaped or other shape is attached to the tip of the adjustment shaft that protrudes from the other end of the holding cylinder. A snap spring was fitted to prevent it from coming out, and the retaining tube was screwed into the chassis using a male thread on the outer periphery to secure it. For this reason, the holding cylinder must be made by turning a metal bar with a diameter larger than the outer diameter of the collar to form male threads on the collar and outer periphery, and a through hole in the center for passing the adjustment shaft. A large amount of chips are generated and a large amount of material is wasted. Furthermore, an annular groove for fitting the snap ring must be formed at the tip of the adjustment shaft by turning, which is time-consuming. Furthermore, it requires a snap spring and a work process to fit it, and it takes time to turn and firmly screw it into the screw hole of the chassis. and,
These factors affected the cost and had to increase it.

Therefore, in the present invention, the holding cylinder is molded from plastic, and the adjustment shaft can be easily and rotatably attached to the holding cylinder without using a snap spring, and the holding cylinder of the assembled assembly can be pushed into a hole in the chassis, etc. This solved the problems of the conventional method by making it possible to fix it with just one hand.

Generally, the chassis is fixed inside a cabinet, and the boss of the tuning dial is passed from the outside through a hole in the cabinet, and the boss is fitted onto the other end of the adjustment shaft. Therefore, although the hole in the cabinet and the adjustment shaft are aligned, slight deviations may occur within tolerance. Conventional mounting devices do not have a means to absorb the above-mentioned error between the adjustment shaft and the holding cylinder, so if the adjustment shaft is out of alignment, the adjustment is made by cutting a hole in the cabinet or re-fixing the chassis to the cabinet. According to the present invention, since the adjustment shaft can be held in the holding cylinder so as to be able to swing slightly, the deviation due to the above-mentioned error can be absorbed by the mounting device.
It also eliminates the need to modify holes in the cabinet or re-fix the chassis.

Hereinafter, the present invention will be explained with reference to the illustrated embodiments.

Reference numeral 1 indicates an adjustment shaft, and a winding section 2 connects a tuning pointer in the middle of its length and wraps a thread to move it.
is provided between the upper and lower two flanges 2a and 2b, and is rotatably supported on the holding cylinder 4 by a shaft portion 3 that has a smaller diameter than the winding portion and protrudes from the lower flanges 2b, and is rotatably supported from the upper flanges 2a. As is conventional, the protruding portion has an axial notch or knurling on its outer periphery and serves as a dial mounting portion 5 into which a dial boss is fitted. The adjusting shaft may be turned from metal or may be injection molded plastic.

The above-mentioned shaft part 3 is slightly spaced downward from the flange 2a and is attached to the flange 2b.
It has an integral flange 6 with a diameter smaller than that of the flange 6. The holding cylinder 4 has a flange-shaped head 7 at the upper end, and has a hole 8 on the upper surface of the head 7 to receive the lower surface of the flange 2b and accommodate the shaft 3 therethrough. Peripheral wall 9
The engaging pieces 10 are opposed to each other and protrude from the outer periphery with the upper end being a free end by an upward U-shaped notch 10'.

This holding cylinder 4 is a plastic injection molded product.
It consists of two half-shell pieces 4', 4' of the same shape whose lower ends are joined by a thin wall piece 11, and a hole 8 is formed on the opposing surfaces of both shell pieces 4', 4' slightly from the shaft part 3. They are formed as accommodating parts 12, 12 which have a large semicircular cross section and accommodate the flange 6 half the circumference, and accommodating parts 13a, 13a and 13b, 13b which accommodate the upper part 3a and lower part 3b of the shaft part 3 on the upper and lower sides of the flange 6, respectively. , the receiving portions 13a, 13a of the upper portion 3a are open to the upper surface of the component parts 7', 7' of the head 7. Incidentally, one engaging piece 10 is provided on each shell piece 4'.

In order to fix both shell pieces 4', 4' facing each other on the upper surfaces of the head component parts 7', 7', a collar 2b is provided.
A protrusion 14 and a snap claw 15 for elastically engaging the protrusion 14 are integrally provided on the outside of the contact surface with the protrusion 14.

To attach the adjustment shaft, bend the thin wall piece 11 to open both shell pieces 4', 4', insert the shaft part 3 between them, align each part with the housing part, close both shell pieces so that they face each other, and then snap them together. The protrusion 14 is hooked onto the claw 15. As a result, the flange 6 of the shaft portion 3 of the adjustment shaft is accommodated in the accommodating portions 12, 12, and the upper and lower portions of the flange 6 are accommodated in the accommodating portion 1.
3a, 13a and 13b, 13b, it is rotatably held in the axial direction and cannot be removed.

The chassis S has an engagement piece 10 extending from the outer periphery.
10 is bent inward to open a hole through which the holding cylinder 4 can pass. Further, the distance between the engaging piece 10 and the lower surface of the head 7 is set to correspond to the thickness of the chassis.

As a result, when the holding tube is pushed into the hole in the chassis until the bottom surface of the head comes into contact with the outer surface of the chassis, the engaging piece 1
0 and 10 spring back outward and lock the edge of the hole from the back side, so that the holding cylinder can be fixed to the chassis simply by pushing it into the hole (Fig. 6).

In this case, for example, the upper part 3a and the lower part 3b of the shaft part 3
Assuming that the outer diameter of is 4 mm and the outer diameter of the flange is 6 mm,
The inner diameter of the accommodating parts 13a, 13a that accommodate the upper part 3a is 4.1 mm, the inner diameter of the accommodating parts 13b, 13b of the lower part 13b is 4.4 mm, the inner diameter of the flange accommodating parts 12, 12 is 7 mm, and the flange thickness is 1.5 mm. Accommodation part 1
When the axial length of the shafts 2 and 12 is 1.8 mm, the adjustment shaft mounting part 5 takes advantage of the slight wobble between the upper part 3a of the shaft part and the accommodation parts 13a and 13a that accommodate it, and uses this as a fulcrum. Since the neck can vibrate, when later inserting the boss B of the dial D into the hole of the cabinet c and fitting it into the dial mounting part 5 of the adjustment shaft, even if the alignment between the hole of the cabinet and the mounting part 5 is slightly misaligned, The dial can be fitted without any problem (Fig. 6).

Moreover, the lower part 3b of the shaft part 3, the housing part 13b,
13b and the flange 6 and its accommodation portions 12, 12, and the upper part 3a and its accommodation portion 13.
By making the diameter difference between a and 13a larger than that, it is also possible to vibrate the neck using the lower part of the shaft portion 3 as a fulcrum.

The shell pieces 4', 4' are provided with an accommodating part 13b that is spaced downward from the accommodating part 12 of the flange 6 and accommodates only the lower end of the lower part 3b of the shaft 3. The inner surface of the piece 10 is remote from the lower part of the shank. This not only reduces the amount of plastic used to form the retaining tube, but also provides space to allow sufficient inward deflection of the engagement pieces 10, 10 when the retaining tube is pushed into the chassis hole.

Further, when the holding cylinder is attached to the chassis, it is preferable that the holding cylinder is provided with a rotation preventing means 18 for stopping the holding cylinder from rotating in the hole of the chassis. This anti-rotation means 18 has a flat surface 1 on a part of the outer surface of the peripheral wall 9.
8a is provided, and the hole in the chassis is also made in a shape other than a circle having a flat portion corresponding to this flat surface 18a.

As is clear from the above, according to the present invention, the shaft portion of the adjustment shaft is held rotatably, and the assembly thus assembled can be easily fixed by simply pushing the holding cylinder into the hole in the chassis, and there are fewer parts than in the past. In addition to reducing the number of points used, work efficiency is significantly improved and costs can be reduced.

[Brief explanation of drawings]

Fig. 1 is a side view of an embodiment of the present invention in an unassembled state, Fig. 2 is a plan view showing one half showing the upper surface of the holding cylinder and the other half showing the bottom side, and Fig. 3 shows the injection molded state of the holding cylinder. Fig. 4 is a side view showing a part of the cross section, Fig. 4 is a top view showing a part of the cross section along the - line of Fig. 3, and Fig.
The figure is a plan view of a part of Fig. 3, and Fig. 6 is a partially sectional side view of the assembled state. In the figure, S is a chassis, D is a dial, 1 is an adjustment shaft, and 3 is its shaft. ,
4 is a holding cylinder, 5 is a dial attachment part, 6 is a flange provided in the middle of the shaft part, 7 is a brim-shaped head of the holding cylinder,
Reference numeral 8 indicates a hole, and reference numeral 10 indicates an engagement piece.

Claims (1)

[Scope of Claim for Utility Model Registration] A holding cylinder having a flange-shaped head extending from the outer periphery at the upper end, which is inserted and fixed into a hole in the chassis with the head in contact with the edge of the hole, and a dial attached to the upper end. In a dial adjustment shaft mounting device comprising a mounting portion and an adjustment shaft having a shaft portion rotatably supported by the holding cylinder at the lower end, the adjustment shaft has a flange protruding from the outer periphery in the middle of the shaft portion. The retaining cylinder is made of plastic and consists of two shell pieces of the same shape whose lower ends are joined by a thin piece, and the two shell pieces have a shaft portion of the adjustment shaft and a retaining prevention member on opposite surfaces thereof. and a recessed housing portion for cooperatively housing the flanges for use,
The peripheral wall of each shell piece is provided with an elastic engagement piece protruding from the outer periphery, which engages with the edge of the hole in the chassis in cooperation with the flanged head and fixes the holding cylinder to the chassis. Features a dial adjustment shaft mounting device.