JPS6046007B2 - Sliding device using composite molding - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sliding device constructed by attaching a molded resin member made of synthetic resin to a substrate in a slidable manner, and an object of the present invention is to extremely simplify the construction of such a sliding device. The objective is to make it possible to obtain it at a low cost.

In conventional sliding devices of this type, only a resin molded member is manufactured in advance, a guide hole is drilled in a metal substrate, and the resin molded member is then engaged with the hole to enable free sliding. .

However, with this type of device, the resin molded member and the guide hole of the board sometimes do not engage well, and unless dimensional accuracy is maintained, the resin molded member will not slide well, making manufacturing complicated. This resulted in high costs.
The present invention is intended to eliminate such conventional drawbacks, and one embodiment thereof will be described below with reference to the drawings.

Figures 1 to 3 show the completed state of the sliding device of this embodiment, with reference numeral 1 being a metal substrate, 2 being a long hole provided in this substrate 1, and 3 being a hole in this long hole 2. It is a synthetic resin molded member that is slidably provided in the longitudinal direction.

The elongated hole 2 has semicircular holes 4, 4 provided on both sides of one end thereof. Also, on the lower surface of both side edges of the elongated hole 2, there are figures 5 and 6.
As shown in the figure, a tapered portion 5 that extends downward from the substrate 1 is provided. On the other hand, the resin molded member 3 has a main body part 6 large enough to cover the long hole 2 on the top side of the board 1, a sliding part 7 inside the long hole 2, and a slide part 7 for operating a switch etc. on the second side of the board 1. A boss portion 8 is provided. The sliding part 7 is the semicircular hole 4
The protrusion 7a engages with the tapered portion 5, and the protrusion 7b engages with the tapered portion 5. Each of these parts is molded with synthetic resin to constitute the resin molded member 3. Next, the dimensional relationship between the two parts of the long hole will be explained with reference to Figures 4 and 6.
The width of the main part is L, the width between the semicircular holes 4 and 4 is
The length of the main part is L3, and the inclination angle of the tapered part 5 is α°.

To explain the manufacturing process of the device of this embodiment having such a structure, first, a long hole 2 is bored in a substrate 1 as shown in FIGS. 4 to 7.

Then, this substrate 1 is placed into upper and lower molds 9 as shown in FIG.
, to be worn between 10 and 10 hours. The upper mold 9 is provided with a recess 11 for forming the main body 6 of the resin molded member 3. Further, the lower mold 10 is provided with a hole 12 for forming the boss portion 8 of the resin molded member 3. A hole 13 communicating with this protrusion 12 is a hole for resin injection. The substrate 1 is held between the upper and lower molds 9 and 10, and the recesses 11 and 1 are formed through the holes 13.
When synthetic resin is injected and filled into the long holes 2 of the substrate 2 and the substrate 1, cooled and solidified, and the upper and lower molds are divided, a composite of the substrate 1 and the resin molded member 3 as shown in FIGS. 9 to 11 is obtained. A molded product is obtained. In this composite molded product, a gap is created between the resin molded member 3 and the elongated hole 2 of the substrate 1 as shown in the figure.

This is caused by the contraction of the resin as it cools, and the gap is created between the peripheral wall of the elongated hole 2 and the sliding portion 7 of the resin molded member 3, and between the tapered portion 5 and the protrusion 7b. If the former gap is ΔS and the shrinkage rate of the synthetic resin is S, then ΔS1=1 above S. Also taper -1Z-T section 5
Since the angle α0 is α0=twist n - royu (T1: thickness of the substrate 1), if Le>ZTl, a gap is created between the taper part 5 and the protrusion 7b of the resin molded member 3, and the resin Although the molded member 3 separates from the substrate 1, the tapered part 5 and the protrusion 7
b, the engagement between the main body 6 and the substrate 1, and the engagement between the semicircular hole 4 and the projection 7a, the position is held and cannot be moved.

Therefore, in FIG. 9, when the substrate 1 is bent downward with respect to the lateral direction of the elongated hole 2, that is, the line of symmetry 11 of the semicircular hole portion 4, resin molding is performed as shown in FIGS. 1 to 3. Since the peripheral wall portion of the other end of the elongated hole 2 that was preventing movement of the member 3 in the direction of the arrow 15 is removed, the member 3 can now slide in the direction of the arrow 15.

This sliding is prevented by the boss portion 8 coming into contact with the bent piece 1a of the substrate 1. Note that, as shown in FIG. 12, if the resin molded member 3 is formed by forming the long hole 2 into a simple shape without the tapered portion 5, the machining work of the long hole 2 becomes easier, so that the overall working time can be shortened. becomes.

In this case, if a means for preventing the resin molded member 3 from coming off is required, it may be provided separately. As described above, the sliding device by composite molding of the present invention can be constructed by extremely simple means of assembling the resin molded member to the board by composite molding and bending the board, so it is cost-effective. Needless to say, it is possible to reduce the amount of noise and the number of assembly steps required, and it is also possible to provide a device that is highly accurate and operates well without any variation.

Moreover, since the number of sliding devices increases, the number of assembly steps required for assembly is only that for one device, and the industrial efficiency is great.

[Brief explanation of drawings]

FIG. 1 is a plan view of a sliding device in an embodiment of the present invention;
FIG. 2 is a front view of the same, FIG. 3 is a cross-sectional view taken along the line A-A'' in FIG. 1, FIG. 4 is a plan view of the board constituting the device, and FIG. 6 is an enlarged sectional view of the main part of FIG. 5, FIG. 7 is a sectional view taken along line C-C'' in FIG. 4, and FIG. 8 is a sectional view showing a mold for manufacturing the device. Figure 9 is a plan view of a composite molded product manufactured using the same mold, and Figure 10 is D of Figure 9.
11 is a sectional view taken along the line E of FIG. 9,
FIG. 12 is a sectional view showing another embodiment of the present invention. 1...Substrate, 1a...Bending surface, 2...
...Long hole, 3...Resin molded member.

Claims (1)

[Claims] 1. A resin molded member is formed by providing a long hole in a substrate, filling the entire long hole of the substrate with a synthetic resin, and performing composite molding,
A sliding device by composite molding, in which the substrate is bent to include a part of the elongated hole, and the resin molded member can be slid freely using the elongated hole as a guide. 2. The elongated hole has a tapered portion at the opening periphery,
Claim 1: A resin molded member is engaged with the tapered portion to prevent the resin molded member from coming off.
A sliding device made of composite molding as described in Section 1.