JP4670067B2 - Cylinder lock - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cylinder lock, and more particularly, to a cylinder lock that can prevent breakage by knocking off a tail piece at an inner end of an inner cylinder from the outdoor side.
[0002]
[Prior art]
For example, there are various types of cylinder locks such as pin tumbler locks and lever tumbler locks. At least the cylinder locks manufactured and sold by the applicant are attached to the door via the cylinder cylinder 11 (see FIG. 4). Therefore, the outer shape, dimensions, etc. are kept constant according to the standard.
[0003]
Further, as shown in FIGS. 1 and 2, the tail piece for transmitting the rotation of the cylinder lock inner cylinder to the dead bolt control mechanism in the lock box is a slit 3 (see FIG. 1) of the tail plug 2 connected to the inner cylinder 1. 2), a tail piece 5 having a pair of legs 4, 4 is inserted and attached.
[0004]
Then, a serpentine stopper plate 7 is fitted to the base step of the tail plug 2 so that the tail piece 5 does not come out of the tail plug 2 and so that the whole inner cylinder does not come out of the outer tube 6 to the outdoor side. These are integrally connected by a retaining ring 8 such as a C-ring.
[0005]
[Problems to be solved by the invention]
As shown in FIGS. 1 and 3, the cylinder lock configured as described above has a plate-like tool inserted into a key hole that opens to the outside of the room, and the inside of the key hole through which the key tip passes as shown in FIG. 1. If the head of the outer end of the tool 9 is hit with a hammer or the like while the inner end is in contact with the tail plug through the end portion, the retaining ring 8 may fly by the impact and the tail piece 5 may come off. .
[0006]
Then, since the dead bolt control mechanism in the lock box can be seen from the keyhole, unauthorized unlocking with a tool (not shown) can be performed.
[0007]
An object of the present invention is to provide a cylinder lock capable of preventing the breakage caused by knocking off the tail piece at the inner end of the inner cylinder from the outdoor side as described above.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the present invention is a cylinder lock that is mounted on a door surface via a cup-shaped cylinder and has a plate-like tail in a slit of a tail plug with a slit that is mounted on the inner cylinder. Insert a piece, fit a serpentine stopper plate that serves to prevent the tail piece from slipping out of the tail plug and the inner tube from the outer tube, and attach a retaining ring to the inside of the stopper plate. When fitted, a retaining ring is fitted on the tail plug further inside the retaining ring so that the entire shape is a snake-like shape and the outer diameter is smaller than the inner diameter of the cylinder cylinder. Is made to be able to engage from the outside with a cylinder retaining ring for retaining the cylinder lock fitted to the inner cylinder portion of the cylinder cylinder.
[0009]
【Example】
An embodiment of the present invention will be described below with reference to FIGS.
In FIG. 4, reference numeral 11 denotes a cylinder cylinder. A conventional cylinder lock is housed in the cylinder cylinder 11, and is prevented from being removed by a retaining ring 12 that is retained inside the cylinder lock (right side in FIG. 4). Is given.
[0010]
Incidentally, the cylinder cylinder 11 has a cup shape as a whole, mounting blocks 13 and 13 formed on the outer peripheral surface of the opening edge portion on the inner side (right side in FIG. 4), and a mounting rod 14 penetrating a lock box (not shown), 14 is attached to the door.
[0011]
A decorative cylinder 15 is attached to a portion of the cylinder cylinder 11 that protrudes from the outer surface of the door, and the decorative cylinder 15 is automatically adapted to the thickness of the door by the elasticity of a non-numbered compression coil spring. Adjust its position. Since the structure around the cylinder cylinder described above is well known, further detailed description is omitted.
[0012]
In the cylinder lock according to the present invention, as shown in FIGS. 4 and 5, the outer shape of the tail plug 2 inside the retaining ring 8 has a snake-like overall shape, and the outer diameter is smaller than the inner diameter of the cylinder cylinder. A stop ring 16 is rotatably fitted.
[0013]
In the illustrated embodiment, as shown in FIGS. 5 and 6, the cross section of the retaining ring 16 is formed with a step portion so that it can be joined to the stopper plate 7 and the retaining ring 8 without a gap, Claws 17 that project into engagement with the slits of the tail plug 2 to prevent rotation are provided at two symmetrical positions across the center of the opening edge.
[0014]
As shown in FIG. 4, the retaining ring 16 faces the cylinder retaining ring 12 from the outside via a spacer ring 18.
[0015]
In the present invention, since at least the retaining ring 12 is inserted between the cylinder lock and the cylinder lock, the cylinder retaining ring 12 moves inward from the conventional position.
[0016]
When the cylinder lock according to one embodiment of the present invention configured as described above is inserted with the tool 9 in the key hole as shown in FIG. It is received by the cylinder retaining ring 12 through the tail piece 5, the stopper plate 7, the retaining ring 8 and the spacer ring 18.
[0017]
Normally, the cylinder retaining ring 12 is larger than the retaining ring 8 and is thick and has a large degree of engagement with the cylinder cylinder 11, so that it does not endure the striking force that the tool 9 can carry.
[0018]
When a greater striking force is applied to the tool, the tool that can be inserted into the keyhole has a small cross-sectional area, so that the tool itself is broken or plastically deformed without being able to withstand the stress, and eventually the tailpiece 5 is knocked off. It is not possible.
[0019]
【The invention's effect】
As is apparent from the above description, the present invention provides a tail plug on the inner side of the retaining ring that prevents the tail piece from coming off. The retaining ring has an overall shape of a snake-like shape and an outer diameter smaller than the inner diameter of the cylinder cylinder. Since the retaining ring is made to be able to engage with the cylinder retaining ring for retaining the cylinder lock that is fitted to the inner cylinder portion of the cylinder cylinder from the outside, the tool is inserted into the key hole. Even if an impact is applied to the tail piece by hitting the head of the tool, this impact is received by the cylinder retaining ring, and eventually the tail piece can be prevented from coming off.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an inner end portion of a conventional cylinder lock.
FIG. 2 is an external perspective view showing an example of a structure of a tail plug.
FIG. 3 is a side view of a conventional cylinder lock.
FIG. 4 is a partial cross-sectional side view of a cylinder lock according to an embodiment of the present invention, showing a state where it is housed in a cylinder cylinder.
FIG. 5 is a rear view of a cylinder lock according to an embodiment of the present invention.
FIG. 6 is a cross-sectional view of a retaining ring.
[Explanation of symbols]
1 Inner cylinder 2 Tail plug 3 Slit 4 Leg part 5 Tail piece 6 Outer cylinder 7 Stopper plate 8 Retaining ring 11 Cylinder cylinder 12 Cylinder retaining ring 16 Retaining ring 17 Claw 18 Spacer ring

Claims (1)

A cylinder lock that is attached to the door surface via a cup-shaped cylinder. A plate-like tailpiece is inserted into the slit of a tailplug with a slit that is attached to the inner cylinder. A stopper plate with a serpentine shape that serves as both a retaining stopper for the inner cylinder and a retaining stopper for the inner cylinder from the outer cylinder is fitted to the tail piece, and a retaining ring is fitted to the inside of the stopper plate. Is attached to the inner cylinder portion of the cylinder cylinder so that the retaining ring is pivotally fitted to the tail plug, and the outer diameter is smaller than the inner diameter of the cylinder cylinder. A cylinder lock characterized in that it can be engaged from the outside with a cylinder retaining ring for retaining the cylinder lock.

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