JPH0446450Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) This invention relates to a cylinder lock that is attached to a vehicle door, for example, and in particular, it is a lock that automatically returns an inner cylinder having a key hole to an outer cylinder. This relates to the waterproof structure of the return spring.

(Prior Art and its Problems) Conventionally, this type of cylinder lock is known, for example, as described in U.S. Pat. According to this, there is a space between the inner cylinder and the outer cylinder that are coaxially fitted into the outer cylinder, and after the inner cylinder rotates when a key is operated, the inner cylinder is rotated relative to the outer cylinder. A return spring is provided to return the key to the previous position, and this return spring extends along the outer circumference of the inner cylinder and from the rear end of the outer cylinder at the rear end in the key insertion direction. It is provided so as to protrude slightly.

However, according to such a conventional configuration, the return spring is provided in an exposed state at the rear end in the key insertion direction, so that, for example, when the cylinder lock is attached to a car door, the cylinder lock is disposed. There are many opportunities for water droplets to drip into the door structure from above (for example, through the door glass), which causes the problem of rusting of the return spring.

(Means for Solving the Problems) This invention was made to solve the problems of the prior art. The inner cylinder is provided so as to protrude slightly from the rear end of the outer cylinder and to wrap around the outer circumference of the inner cylinder, and after the inner cylinder rotates when a key is operated, the inner cylinder is attached to the outer cylinder. In contrast, the cylinder lock has a return spring for returning to a position before rotation, characterized in that an eaves portion is provided on the outer cylinder side to cover at least an upper part of the return spring with respect to the key insertion direction, The purpose of the present invention is to provide a waterproof structure for a return spring in a cylinder lock that can prevent the spring from rusting.

(Function) Since the return spring is provided with an eave portion at least above the return spring, even if water droplets are poured from above, the water droplets will not directly adhere to the return spring.

(Embodiment) Figures 1 to 3 show a first embodiment of this invention, in which a cylinder lock 1 is installed, for example, on the driver's side door of an automobile with the vertical direction in Figure 1 as the vertical direction. The inner cylinder 2 of this cylinder lock 1 is rotatable around the central axis inside the outer cylinder 3, and a key hole 4 is formed in the inner cylinder 2. Note that a notched annular portion 3a, which will be described in detail later, is formed on the distal end side of the outer cylinder 3 (the right end side in FIG. 1), that is, on the rear end side of the cylinder lock 1, and this notched annular portion 3a and the inner cylinder 2 A lock plate cam 5 for preventing the inner cylinder 2 from separating from the outer cylinder 3 is mounted between the rear end and the rear end via an E-shaped clip 6.

A return spring 7 is provided at the rear end of the notched annular portion 3a to automatically return the inner tube 2 to its original position after rotation when a key is operated, so as to wrap around the outer periphery of the notched annular portion 3a. A substantially semi-circular eaves portion 8 is formed above the return spring 7 .

2 and 3 show details of the relationship between the notched annular portion 3a or the return spring 7 and the eave portion 8, and both ends 8a and 8b of the return spring 7 are connected to the notches below the notched annular portion 3a. They pass through the notches and are respectively locked in the locking grooves 2a on the lower side of the inner cylinder 2.

With this structure, the cylinder lock 1
Even if water drops fall from above, the water drops will fall on the eaves 8.
Since it is received or repelled by the return spring 7, it does not directly attach to the return spring 7.

FIG. 4 shows a second embodiment, in which a collar 9 is detachably attached to the rear end of the outer cylinder 3, and this collar 9 covers the notched annular portion 3a on the inner peripheral side. A crown annular portion 10 having an annular groove 10a to be inserted into the crown annular portion 10 is formed, and a substantially semicircular arc-shaped eave portion 11 is formed on the outer circumferential side of the crown annular portion 10. Therefore, the return spring 7 is mounted so as to be wound around the outer periphery of the crown ring part 10, and the eaves part 11 covers the upper part thereof. Other configurations and operations are similar to those of the previous embodiments, so redundant explanations will be omitted. Note that it is preferable that the collar 9 be molded from a corrosion-resistant resin.

(Effects of the invention) As described above, according to this invention, the rear end portion of the inner cylinder coaxially fitted into the outer cylinder in the key insertion direction is provided so as to protrude slightly from the rear end of the outer cylinder. and a return spring that is provided so as to wrap around the outer periphery of the inner cylinder and returns the inner cylinder to the position before rotation with respect to the outer cylinder after the inner cylinder is rotated when a key is operated. In the cylinder lock, an eaves portion is provided on the outer cylinder side to cover at least an upper part of the return spring in the key insertion direction, so water droplets are prevented from directly contacting the return spring by being protected by the eaves portion. There is no adhesion, and it is possible to prevent the return spring from rusting, and the formation of the eaves part has the additional effect of preventing the biasing force of the return spring from decreasing due to the adhesion of dust.

[Brief explanation of the drawing]

1 to 3 are views showing a first embodiment of this invention, FIG. 1 is a sectional view showing an embodiment of a cylinder lock according to this invention, and FIG.
FIG. 3 is an exploded perspective view of the main parts showing details of the rear end of the cylinder lock, and FIG. 4 is an exploded perspective view of the main parts showing the second embodiment, similar to FIG. 3. 1... Cylinder lock, 2... Inner cylinder, 3... Outer cylinder,
7...Return spring, 8, 11...Eave part.

Claims (1)

[Claims for Utility Model Registration] 1. The rear end of the inner cylinder coaxially fitted into the outer cylinder in the direction of key insertion is such that it slightly protrudes from the rear end of the outer cylinder, and A cylinder lock having a return spring that is arranged to wrap around the outer circumference and return the inner cylinder to the position before rotation with respect to the outer cylinder after the inner cylinder is rotated when a key is operated, A waterproof structure for a return spring in a cylinder lock, characterized in that an eaves portion is provided on the outer cylinder side to cover at least an upper part of the return spring in the key insertion direction. 2. A waterproof structure for a return spring in a cylinder lock according to claim 1, wherein the eave portion is integrally formed with the outer cylinder. 3. A waterproof structure for a return spring in a cylinder lock according to claim 1, wherein the eaves portion is formed in a collar that is detachably attached to the outer cylinder.