JPH0637181Y2 - Cylinder lock with cap - Google Patents

Description

TECHNICAL FIELD The present invention relates to a cylinder lock with a cap in which the cap is not damaged when the cap is attached to the cylinder lock.

Conventional technology In order to decorate the front of the cylinder lock and improve weather resistance,
It is known to mount a cap on the front surface of a cylinder lock. This cap is usually formed by pressing a thin plate of stainless steel, and is mounted on the front surface of the cylinder lock when the cylinder lock is assembled.

Recently, instead of the stainless cap, a synthetic resin cap that is easy to mold and mount is used.
As shown in FIGS. 10 and 11, the synthetic resin cap 10 has a locking portion 11 that projects radially inward and is formed as an undercut portion on the circumference. The locking portion 11 of the injection-molded cap 10 is forcibly pulled out at the time of releasing from the mold 14. When the cap 10 is mounted on the flange portion 13 formed on the front surface of the cylinder lock 12, the cap 10
After the cap 10 is press-fitted into the front portion of the cap 10 and the cap 10 is expanded radially outward, the locking portion 11 is locked to the rear surface of the flange portion 13.

Problems to be Solved by the Invention By the way, since the conventional synthetic resin cap is forcibly removed at the time of molding as described above and is press-fitted when mounted on the cylinder lock 12, the cap is repeatedly subjected to tensile force. For this reason, the cap is often damaged when mounted on the cylinder lock. On the other hand, in order to improve the decorative effect, the synthetic resin cap is required to be plated with chrome.

That is, the cap 10 is made of nylon, polypropylene, ABS.
Resin or synthetic resin such as polyacetal resin is integrally molded, and then the surface of the resin of the cap 10 is directly plated with chromium. This chrome plating is performed as follows, for example. First, as a pretreatment step, untreated synthetic resin cap 10 was degreased with trichlene vapor for 1 minute and dried for 30 minutes, and then sulfuric acid-phosphoric acid added with 1% of acid resistant surfactant (ethylene oxide type). Spray the mixture onto the surface
Etching treatment is performed at 50 ° C. for 10 minutes, and if necessary, neutralization or hot water washing is performed, and then water washing is performed to give sensitivity and activation treatment. Here, the sensitization is 2 g / l and 35 g of stannous chloride.
The solution containing 5% hydrochloric acid (5 ml / l) was sprayed, and the activation treatment was
It is carried out by spraying a solution containing 1.5 g / l of palladium chloride and 2 ml / l of 35% hydrochloric acid. Next, the surface is treated with a chemical plating solution,
Electrodeposit chrome plating to a thickness of 20 μm. In this case, the chemical plating solution is a solution containing nickel sulfate 20 g / l, sodium hypophosphite 15 g / l, ammonium citrate 25 g / l and a trace amount of lead nitrate as a stabilizer.

After the above plating process, a metallic mirror surface is formed on the outer surface of the cap 10, but the cap 10 itself loses elasticity a little and becomes slightly fragile. Therefore, it becomes more difficult to press-fit the cap 10 having such a plated surface onto the front surface of the cylinder lock without damaging it.

For example, as shown in Japanese Utility Model Laid-Open No. 60-97857 and Japanese Utility Model Laid-Open No. 60-97858, an engaging portion extending in the axial direction is formed and the elastic force of the resin is used to attach the cap to the cylinder lock. A method of mounting on the front surface has been proposed. However, in this method, since the engaging portion is projected in the axial direction, when the plating treatment is performed, not only the elasticity of the engaging portion is reduced, but also the maximum bending stress of the engaging portion is significantly increased due to weakening. descend. Further, since the engaging portion is projected in the axial direction, there is a drawback that the total length of the cylinder lock is increased.

An object of the present invention is to solve the above-mentioned drawbacks and to provide a cylinder lock with a cap in which the cap is not damaged when the cap is attached to the cylinder lock.

This cylinder lock with cap has a flange part formed almost all around the front part of the case having an axial hole that rotatably accommodates the key cylinder, and the flange part is made of synthetic resin. The cap of is attached. The cap has a front wall extending substantially in the radial direction, a hole formed in the front wall, an edge portion formed in the outer peripheral portion of the front wall in the axial direction, and a claw portion extending radially inward from the edge portion. . The cap is integrally formed of synthetic resin and the surface thereof is plated. The flange portion of the case is provided with a notch portion through which the claw portion of the cap passes. A concave portion is formed on one of the inner surface of the cap facing the claw portion of the cap and the front surface of the flange portion of the case, and a convex portion is formed on the other. After the claw portion has passed through the cutout portion, it is locked to the rear surface of the flange portion of the case by rotating the cap. The engagement of the concave portion and the convex portion prevents rotation of the cap.

Action After inserting the claw part of the cap into the notch part formed in the flange part of the case, rotate the cap to attach the cap to the flange part formed on the entire surface of the cylinder lock without deforming the claw part. Can be installed. Further, since the concave portion and the convex portion are engaged by the rotation of the cap, the reverse rotation of the cap is prevented.

Embodiment An embodiment of the present invention will be described below with reference to FIGS.

1 and 2 are sectional views taken along the lines AA and BB of FIG. 3, respectively. Cylinder lock with cap 20 of the present invention has a flange portion 24 extending almost all around the case 23 formed in the front portion of a case 23 having an axial hole 22 accommodating a key cylinder 21 in a rotatable manner. It has a structure in which a cap 25 made of synthetic resin is attached to 24. As shown in FIG. 6, the cap 25 includes a front wall 25a extending substantially in the radial direction, a hole 25b formed in the front wall 25a, and an edge portion 25c formed in the outer peripheral portion of the front wall 25a in the axial direction. , A pair of claw portions 25d extending radially inward from the edge portion 25c. The pair of claws 25d is 180 °
Are formed at the edge portions 25c diagonally opposite to each other and separated by an angle of. The front wall 25a is provided with a tapered annular conical portion 25e. The cap 25 is integrally molded, and the surface of the cap 25 is subjected to chrome plating. As shown in FIGS. 4 and 5, the flange portion 24 of the case 23 is provided with a cutout portion 24a through which the claw portion 25d of the cap 25 passes, and after the claw portion 25d passes through the cutout portion 24a, By rotating the cap 25 by about 90 °, the rear surface of the flange 24 of the case 23
Locked to 24b. When the claw portion 25d is locked to the rear surface 24b, the cap 25 is prevented from coming off, and when the key cylinder 21 is attached to the hole 22 from the front side, the key cylinder 21 is also prevented from coming off the hole 22.

As shown in FIG. 7, a convex portion 25g and a concave portion 24c are formed on the inner surface 25f of the cap 25 and the front surface 23a of the case 23 facing the claw portion 25d of the cap 25, respectively, and the convex portion 25g and the concave portion 24c are engaged with each other. The cap 25 prevents the cap 25 from rotating in the reverse direction. The convex portion 25g is small and the cap 25
It is mounted in the recessed portion 24c only by generating a small stress.
Therefore, when the cap 25 is mounted on the cylinder lock 20, the cap 25 is not damaged.

At the time of manufacturing, the cap 25 is injection-molded using the slide mold 30 shown in FIGS. 8 and 9. Slide type
The rod 30 can be moved in the radial direction of the cap 25 by the rod 31. FIG. 8 shows details of the shape of the slide mold 30. After molding the cap 25, the rod 31 slides radially inward
Is moved to separate the cap 25 from the slide mold 30.

The above embodiments of this invention can be modified. For example, an example in which two claw portions 25d and corresponding notch portions 24a are provided is shown, but three or more may be provided. Further, this invention can be applied not only to a tumbler type cylinder lock but also to a 80,000 lock. Further, as opposed to forming a convex portion and a concave portion on the inner surface of the cap and the front surface of the case, respectively, which face the claw portion of the cap, it is also possible to form a concave portion and a convex portion on the inner surface of the cap and the front surface of the case. is there.

Advantageous Effect of the Invention In the present invention, the cap can be attached to the flange portion of the cylinder lock by rotating the cap without deforming the claw portion, so that the cap is not damaged when the cap is attached. Therefore, it is possible to mount the cap on the cylinder lock without generating internal stress in the cap. Further, since the cap of the present invention is provided with the claw portion extending inward in the radial direction from the edge portion, it is not necessary to increase the total length of the key cylinder.

[Brief description of drawings]

FIG. 1 is a sectional view taken along the line AA of FIG. 3 showing a cylinder lock with a cap of the present invention, and FIG. 2 is a sectional view taken along the line BB of FIG.
FIG. 3 is a front view of the cylinder lock with a cap of the present invention, FIG. 4 is a front view of the case, FIG. 5 is a sectional view taken along the line CC of FIG. 1, and FIG. Perspective view of
FIG. 7 is a partial cross-sectional view showing the engagement state between the case and the cap, FIG. 8 is a cross-sectional view of a mold used for manufacturing the cap,
FIG. 9 is a perspective view of a slide mold, FIG. 10 is a sectional view of a mold used for manufacturing a conventional cap, and FIG. 11 is a partial sectional view of a conventional cylinder lock with a cap. 20 …… Cylinder lock with cap, 21 …… Key cylinder, 22
...... Hole, 23 ...... Case, 24 ...... Flange part, 24a ...... Notch part, 24b ...... Rear surface, 25 ...... Cap, 25a ...... Front wall,
25b ... hole, 25c ... edge, 25d ... claw, 25e ... annular cone, 25f ... inner surface,

Claims (1)

[Scope of utility model registration request] 1. A flange portion is formed on substantially the entire circumference of a front portion of a case having an axial hole for rotatably accommodating a key cylinder, and a cap attached to the flange portion has a front wall extending in a substantially radial direction. A hole formed in the front wall, an edge portion formed in the outer peripheral portion of the front wall in the axial direction, and a claw portion extending radially inward from the edge portion, the flange portion of the case In the cylinder lock with a cap, a notch portion through which the claw portion of the cap passes is provided, and the claw portion is locked to the rear surface of the flange portion of the case by rotating the cap, wherein the cap is a synthetic resin. Is integrally formed by and is subjected to a plating treatment on its surface, a concave portion is formed on one of the inner surface of the cap facing the claw portion of the cap and the front surface of the flange portion of the case, and a convex portion is formed on the other, The concave Capped cylinder lock and protrusions, characterized in that the rotation of the cap is prevented by engaging a.