JPH0215132Y2 - - 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. These factors had an effect on the cost, which had to increase.

Generally, the chassis is fixed inside the cabinet, and the boss of the tuning dial is passed through the hole in the cabinet from the outside, 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 hole in the cabinet must be cut or the chassis must be re-fixed to the cabinet for adjustment. It took a lot of effort.

Therefore, the present invention consists of a holding cylinder made of two shell pieces of the same shape that face each other and are molded from plastic, and holds the adjustment shaft so that it can easily swing and rotate without using a snap spring. The assembly consisting of the two shell pieces and the adjustment shaft can be easily fixed by simply pushing it into a hole in the chassis, etc., and even if the holes in the chassis and the holes in the cabinet become misaligned due to errors, they can be fixed within a certain range. This made it possible to absorb errors.

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.

In the embodiment shown in FIGS. 1 to 6, the shaft portion 3 has a flange 6 located a little downward from the flange 2a and having a smaller diameter than the flange 2b.
It has integrally. The holding cylinder 4 has a brim-like head 7.
The inside has a hole 8 on the upper surface of the head 7 that receives the lower surface of the collar 2b and accommodates it through the shaft 3, and the peripheral wall 9 has an upward U-shaped cut 1.
0', the engaging pieces 10 are opposed to each other and protrude from the outer periphery with the upper end being a free end.

This holding cylinder 4 is a plastic injection molded product.
This embodiment consists of two half-shell pieces 4', 4' of the same shape whose lower ends are joined by a thin wall piece 11, and the hole 8 is formed by a shaft on the opposing surface of the pair of shell pieces 4', 4'. 3
Accommodating parts 12, 12 that have a slightly larger semicircular cross section and accommodate the flange 6 half the circumference, and accommodating parts 13a, 13a and 13b, 1 that accommodate the upper part 3a and lower part 3b of the shaft part 3 above and below the flange 6 half the circumference.
3b, the housing part 13a of the upper part 3a,
13a opens through the upper surface of the component parts 7', 7' of the head 7. Incidentally, one engaging piece 10 is provided on each shell piece 14'.

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 latching 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. Storage 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 housing 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).

In this embodiment, both shell pieces 4', 4' are connected at their lower ends by a thin wall piece 11, but both shell pieces may be separated individually without being connected, or they may be connected by a thin wall piece. , do not connect the bottom ends together like this,
The peripheral side portions may be connected to each other so as to be split in the axial direction. Moreover, the lower part 3b of the shaft part 3 and its accommodation part 13
b, 13b is minimized, and the flange 6 and its accommodating parts 12, 12 and the upper part 3a and its accommodating part 1 are
By making the diameter difference between 3a 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 holding cylinder 4 in the embodiment shown in Figs. 7 to 10 is also a plastic injection molded product, and has a flange-shaped head 7 at the upper end, and the lower surface of the flange 2b of the adjustment shaft is received on the head 7 inside. It is the same as the previous embodiment in that it is provided with a hole 8 that accommodates the portion 3 through it, and that the peripheral wall 9 has an engaging piece 10 facing each other, but in this embodiment, the hole 8 is Open portion 8 at the bottom end as well as the top surface of the head 7
It is opened at b and provided in a penetrating shape. Preferably, a thin portion 16 is formed along one side of the peripheral wall 9 so that the thin portion 16 can resist elasticity and deform.

In the case of this embodiment, the shaft portion 3 of the adjustment shaft does not have a flange 6 in the middle, but instead has the inner diameter of the open portion 8b at the tip, that is, at the part that protrudes outward from the open portion 8b at the lower end when passed through the hole. It is integrally provided with a conical portion 17 having a slightly larger diameter. Therefore, the conical part 1 is inserted into the upper end open part 8a of the hole opening on the upper surface of the head 7.
7, the conical part 17 passes through the hole 8 and projects outward from the open part 8b at the lower end while stretching the thin part 16, and when the conical part comes out, the holding cylinder returns to its original state. . In this state, the collar 2b is in contact with the upper surface of the head 7, and the collar on the upper surface of the conical portion 17 is received by the edge of the open portion 8b, so that the adjustment shaft is held in the holding cylinder in the axial direction.

As a result, it can be pushed into the hole in the chassis S and fixed between the engagement pieces 10, 10 and the lower surface of the head 7, as in the previous embodiment.

In order to make it easier to push the holding cylinder into the hole 8, the cross section of the conical part 17 is circular, that is, it is not conical but elliptical, and the short axis at the maximum upper end is equal to the diameter of the shaft 3. , it is preferable to use an elliptical cone shape as shown in the figure, with the long axis slightly larger than the long axis.

Also in this embodiment, the upper end open portion 8 of the hole portion 8
The difference in diameter between a and the shaft portion 3 and the difference in diameter between the lower end open portion 8b and the shaft portion are made larger on one side and smaller on the other, and the adjustment shaft is vibrated using the smaller diameter difference as a fulcrum for adjustment. Misalignment between the dial mounting portion 5 of the shaft and the dial boss insertion hole of the cabinet can be absorbed. However, in this embodiment, the conical part 17 at the tip of the shaft part 3 is made to protrude from the lower end open part 8b of the hole to prevent it from coming off, so the difference in diameter between the lower end open part 8b and the shaft part 3 is made smaller. However, it is preferable to vibrate the neck using this as a fulcrum in order to prevent it from coming off (double-dashed line in Figure 9).

In any of the embodiments, it is preferable for the shaft portion 3 to be held in the hole only at the upper and lower ends in order to prevent neck vibration. For this reason, in the embodiment shown in FIGS. 1 to 6, the housing portions 13a and 1
An accommodating part 13b is provided which accommodates only the tip of the lower part and is spaced downwardly from the accommodating part 2. Between the accommodating parts 12 and 13b, the inner surface of the peripheral wall 9 or the engaging piece 10 is separated from the lower part of the shaft part. 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, in the embodiment shown in FIGS. 7 to 10, the shaft portion 3 of the adjustment shaft has a small diameter at the middle 3' of the portions 3a and 3b that pass through the open portions 8a and 8b at the upper and lower ends of the hole. This saves on the amount of plastic used when molding the adjustment shaft out of plastic, and provides space to allow sufficient inward flexing of the engagement pieces 10,10.

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 is provided with a flat surface 18a on a part of the outer surface of the peripheral wall 9, and the hole in the chassis is also formed on this flat surface 18a.
A shape other than a circle having a flat part corresponding to the shape of the peripheral wall 9, or a rib 18b protruding from the outer surface of the peripheral wall 9,
The chassis may be provided with a hole that communicates with the receiving portion of this rib. Of course, the flat surface 18
Either one of the ribs a or the ribs 18b may be provided, but both may be provided.

As is clear from the above, according to the present invention, the shaft portion of the adjustment shaft is held so as to be able to swing freely, and the assembly thus assembled can be easily fixed by simply pushing the holding cylinder into the hole in the chassis, which is superior to conventional methods. In addition to reducing the number of parts used, work efficiency is significantly improved, and costs are reduced.

[Brief explanation of the drawing]

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 with a part of the cross section shown, FIG.
The figures are a plan view of a portion of FIG. 3, FIG. 6 is a partially sectional side view of the assembled state, FIG. 7 is a side view of another embodiment in an unassembled state, and FIG. Figure 7 -
9 is a cross-sectional side view of the holding tube in the assembled state, and FIG. 10 is a bottom view of the same as above. In the figure, S is the chassis, D is the dial, and 1 is the adjustment shaft. , 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 as a means to prevent it from coming off, 7 is a collar-shaped head of the holding cylinder, 8
10 is a hole, 10 is an engaging piece, and 17 is a conical portion connected to the tip of the shaft portion as a means for preventing slippage.

Claims (1)

[Claims for Utility Model Registration] A holding cylinder that has a flange-shaped head extending from the outer periphery at the upper end and is inserted and fixed into a hole in the chassis with the head in contact with the edge of the hole, and an operating member is attached to the upper end. An adjustment shaft mounting device comprising an adjustment shaft having a mounting part and a shaft part rotatably supported by the cylindrical part of the holding tube below the mounting part, the shaft part of the adjustment shaft comprising: The holding tube has a projecting portion projecting from the outer periphery, and the holding cylinder is made of two shell pieces of the same shape that face each other and are molded from plastic, and a shell piece is provided on the peripheral wall of each of the shell pieces in cooperation with the brim-shaped head. An elastic engagement piece that engages with the edge of the hole and fixes the holding cylinder to the chassis is provided protruding from the outer periphery, and the shaft portion of the adjustment shaft and the overhang portion are provided on opposing surfaces of each of the shell pieces. Each of the shells is provided with a concave semicircular housing part having abutting part that cooperates with the above-mentioned shells and comes into contact with the overhang part from above to prevent the adjustment shaft from coming out upward from the holding cylinder. An adjustment shaft mounting device characterized in that the radius of the upper or lower part of the housing part of the piece is slightly larger than that of the remaining part.