JP2003097104A - Lock structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lock structure capable of preventing its destruction by crushing a decorative ring and deforming and rotating it. SOLUTION: In this lock structure constituted in such a way that a terminal of a cylinder lock 31 is fixed in a lock box provided in a door 49 through a lock insertion hole 63 provided on a door face 49a, the substantially conical decorative ring 65 whose tip side is opened is externally inserted into outer periphery of the cylinder lock 31 protruding from the door face 49a so that a tip part becomes a tip side of the cylinder lock 31, and a rear end part of the decorative ring 65 abuts on the door face 49a due to a urging force of a coil spring 69 inserted externally and supported on the cylinder lock 31, the ring member 71 preventing deformation of the decorative ring 65 in the radial direction by abutting its outer periphery on inner periphery of the decorative ring 65 is fitted into the outer periphery of the cylinder lock 31.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lock structure in which a cosmetic ring is externally attached to the outer circumference of a cylinder lock protruding from a door surface.

[0002]

2. Description of the Related Art A cylinder lock is provided with an inner cylinder portion having a key insertion hole inside an outer cylinder portion, and a plurality of pins arranged in the key insertion direction are arranged in the cylinder portion according to the depth of the key groove. By moving to a predetermined position in the diametrical direction, the inner cylinder can be rotated, the locking and unlocking operation force is input to the locking mechanism inside the lock box provided inside the door, and the dead bolt is advanced and retracted from the mouth of the door to move the door. It can be locked and unlocked.

As shown in FIG. 13, the cylinder lock 1 is housed inside a fixed barrel 3 via a spacer 5. An axial groove 7 is provided on the inner wall of the fixed cylinder, and the groove 7 is fitted with a projection 9 protruding from the outer periphery of the cylinder lock 1 to restrict rotation of the cylinder lock 1. A peripheral groove 11 is provided on the inner periphery of the rear portion of the fixed cylinder 3, and a retaining ring 13 is fitted in the peripheral groove 11. The stop ring 13 presses the rear end surface of the cylinder lock 1 via the ring-shaped liner 15 to prevent the cylinder lock 1 from moving rearward (to the right in FIG. 13).

The fixed cylinder 3 has its rear end inserted into a lock insertion hole 19 formed in the door surface 17a, and its base end is fixed to a lock box (not shown) provided in the door 17. Fixed cylinder 3 protruding from the door surface 17a
On the outer periphery of the cone-shaped decorative ring 21 with the tip side cut off
Is externally inserted so that the tip end is on the tip end side of the cylinder lock 1. A coil spring 23 is externally supported on the outer periphery of the fixed barrel 3, and the coil spring 23 is biased by the urging force.
Is urged, and its rear end is brought into contact with the door surface 17a.

By adopting such a biasing structure of the decorative ring 21, even if the protruding length of the cylinder lock 1 from the door surface 17a is different, the decorative ring 21 is moved in the axial direction of the cylinder lock 1. The lock ring hole 19 can be moved to cover the lock insertion hole 19 by always contacting the rear end surface of the decorative ring 21 with the door surface 17a, and the same cylinder lock 1 can be attached to the doors 17 having different thicknesses.

[0006]

However, in the lock structure in which the cosmetic ring is externally fitted on the outer periphery of the cylinder lock, the cosmetic ring is a conical cylindrical body having an open end, and therefore the cosmetic ring is externally fitted to the fixed cylinder. In this case, a cavity is formed between the fixed cylinder.
Therefore, if the decorative ring is crushed and deformed, it can be held with a tool, and if the fixed cylinder and the cylinder lock are forcibly rotated together with the decorative ring in this state,
It becomes possible to destroy the entire locking device.

Further, it is not impossible to remove the decorative ring with a tool such as a crowbar, grab the exposed cylinder lock, and pry the cylinder lock with a large force to break the cylinder lock from the lock box.

The present invention has been made in view of the above circumstances, and a first object thereof is to crush and deform a decorative ring,
It is an object of the present invention to provide a lock structure that can prevent breakage due to rotation. A second object thereof is to provide a lock structure capable of preventing the cylinder lock from being stripped and broken by gripping the exposed cylinder lock and twisting the cylinder lock with an excessive force.

[0009]

[Means for Solving the Problems] Next, means for solving the above problems will be described with reference to the drawings corresponding to the embodiments. The lock structure according to claim 1 of the present invention is a door 4
The lock box provided inside 9 has a lock insertion hole 6 formed in the door surface 49a.
The base end of the cylinder lock 31 is fixed via 3 and the door surface 4
On the outer periphery of the cylinder lock 31 protruding from 9a, a substantially conical decorative ring 65 having an open front end is externally inserted so that the front end portion is the front end side of the cylinder lock 31, and is externally inserted on the cylinder lock 31. In the lock structure in which the rear end of the decorative ring 65 is brought into contact with the door surface 49a by the biasing force of the supported coil spring 69, the outer periphery is brought into contact with the inner periphery of the decorative ring 65 and the inner side in the radial direction of the decorative ring 65. A ring member 71 for preventing the deformation of the cylinder lock 31 is fitted to the outer periphery of the cylinder lock 31.

In this lock structure, the ring member 71 fitted on the outer circumference of the cylinder lock 31 abuts on the inner circumference of the decorative ring 65 and prevents the decorative ring 65 from being deformed radially inward. Therefore, it becomes difficult to crush and deform the decorative ring 65 using a tool, and the decorative ring 65 maintains a conical shape that allows a tool such as a pipe wrench to slide. This makes it difficult to grip the decorative ring 65, and it is possible to prevent the lock device as a whole from being destroyed by gripping the deformed decorative ring 65 and forcibly rotating the cylinder lock 31.

According to a second aspect of the present invention, in the lock structure according to the first aspect of the present invention, the base end portion of the ring member 71 is formed in a taper shape whose outer diameter gradually decreases toward the base end. In addition, the tip of the tapered portion 73 is fitted in the lock insertion hole 63.

In this lock structure, the base end portion of the ring member 71 fitted to the outer periphery of the cylinder lock has the lock insertion hole 63 of the door 49.
Fit directly into. Thereby, the ring member 71 and the door 49
It is possible to improve the integrated strength of the cylinder lock 31 and the integrated strength of the cylinder lock 31 and the door 49.
The peeling strength from 9 increases. In addition, the ring member 71
Since the base end portion has a taper shape in which the outer diameter gradually decreases toward the base end, the lock insertion hole 63 for fitting the ring member 71 does not need to be made larger than necessary, and the cylinder The fixing strength of the lock 31 to the door 49 is not reduced, and the cover margin of the decorative ring 65 can be sufficiently secured.

According to the third aspect of the present invention, in the lock structure, the base end of the cylinder lock 31 is fixed to the lock box provided in the door 49 through the lock insertion hole 63 formed in the door surface 49a. On the outer periphery of the cylinder lock 31 projecting from the cylinder lock 31, a substantially conical decorative ring 65 having an open front end is provided.
And the cylinder lock 31
In the lock structure in which the rear end of the decorative ring 65 is brought into contact with the door surface 49a by the urging force of the coil spring 69 externally supported on the ring member 93 (the ring member 93 (103 or 113) having the expanded diameter portion 91 (103 or 113) on the tip side. Or 101, 111) is fitted on the outer circumference of the cylinder lock 31 between the inner circumference of the decorative ring 65 and the outer circumference of the cylinder lock 31.

In this lock structure, the enlarged diameter portion 91 (1
03 or 113) having a ring member 93 (or 10)
1, 111) is fitted onto the outer circumference of the cylinder lock 31, even if the decorative ring 65 is removed, the ring member 93 (or 101, 101, 101,
The expanded diameter portion 91 (103 or 113) of (111) is projected. Therefore, it is not possible to obtain a sufficient allowance for the outer periphery of the cylinder lock 31, and by grasping and twisting the cylinder lock 31, it is possible to prevent the entire locking device that tears off the cylinder lock 31 from being destroyed.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of a lock structure according to the present invention will be described in detail below with reference to the drawings. 1 is a cross-sectional view showing a first embodiment of a lock structure according to the present invention,
2 is a front view of FIG. 1, FIG. 3 is a plan view of a key used in the lock structure of FIG. 1, FIG. 4 is a front view of the ring member shown in FIG. FIG. It should be noted that FIG. 1 shows the position of the decorative ring when the cylinder lock is attached to the doors of different thicknesses at the upper part and the lower part with the axis as a boundary.

The cylinder lock 31 is provided inside the outer tube portion 33,
An inner cylinder portion 37 having a key insertion hole 35 is provided. In the cylinder lock 31, for example, a plurality of pins 39a, 39b, 39c, 39d are arranged in the key insertion direction between the outer cylinder portion 33 and the inner cylinder portion 37. The key 41 shown in FIG. 3 has a plurality of recesses 43, and when the key 41 is inserted into the key insertion hole 35, the recesses 43 allow the pins 39a, 39b, 39c, 3 to be inserted.
9d is moved to a predetermined position in the tubular portion diametrical direction, and the shear line is aligned with the boundary between the outer tubular portion 33 and the inner tubular portion 37, so that the outer tubular portion 33 and the inner tubular portion are formed by the pins 39a, 39b, 39c, 39d. The rotation restriction with the portion 37 is released.

Further, the key 41 in this embodiment has a plurality of magnet pieces 45 in the insertion direction. The magnet piece 45 is
The plurality of magnetic movers 47 provided in the cylinder lock 31 are moved in the diameter direction of the cylinder portion by the magnetic force, and the rotation restriction between the outer cylinder portion 33 and the inner cylinder portion 37 is released. Therefore, by inserting the key 41 into the key insertion hole 35, the pins 39a, 39b, 3
The restriction by 9c and 39d and the magnetic mover 47 is released, and the inner cylinder portion 37 becomes rotatable with the key 41 with respect to the outer cylinder portion 33. As a result, the locking / unlocking operation force is input to the locking mechanism in the lock box (not shown) provided in the door 49,
The dead bolt is moved back and forth from the mouth of the tree to enable locking and unlocking.

The center of rotation of the cylinder lock 31 is housed inside the fixed cylinder 51 so as to coincide with the axis of the central axis of the fixed cylinder 51. The cylinder lock 31 has pins 39a, 3
The upper part accommodating 9b, 39c, 39d is a fixed cylinder 51.
Protruding from the outside. The fixed cylinder 51 and the upper protrusion of the cylinder lock 31 are cylindrical spacers 5 fitted to the outer periphery.
Covered by 3. An annular front plate 55 is fixed to the front end surface of the cylinder lock 31, and the front plate 55 exposes the key insertion hole 35 of the inner cylindrical portion 37 from a hole at the center. A peripheral groove 57 is provided on the inner periphery of the rear portion of the fixed cylinder 51,
A retaining ring 59 is fitted in the circumferential groove 57. The stop ring 59 presses the rear end surface of the cylinder lock 31 via the cap-shaped liner 61 and prevents the cylinder lock 31 from moving rearward (rightward in FIG. 1).

The fixed cylinder 51 has a rear portion inserted into a lock insertion hole 63 formed in the door surface 49a, and a rear end portion 51a as a base end is fixed to a lock box (not shown) provided in the door 49. Door surface 49a
Outer periphery of the fixed cylinder 51 protruding from the outer cylinder (that is, the spacer 53)
The outer periphery of the decorative ring 6 is a conical shape with the tip side cut off.
5 is externally inserted so that the front end portion is on the front end side of the cylinder lock 31. The decorative ring 65 has an inner wall portion 67 whose front end portion is bent inward. The decorative ring 65 has the tip of the inner circumference externally fitted to the outer circumference of the front plate 55, and the bent end 67a of the inner wall portion 67 is in contact with the outer circumference of the cylinder lock 31, that is, the outer circumference of the spacer 53. As a result, the makeup ring 65 is
The cylinder lock 31 can be moved a little in the axial direction.

A coil spring 69 is externally fitted on the outer periphery of the spacer 53. The coil spring 69 has one end in contact with the rear end face of the front plate 55 and the other end in the bent end 67 a of the decorative ring 65.
Is in contact with. Therefore, the decorative ring 65 has its rear end abutted against the door surface 49a by the biasing force of the coil spring 69 externally supported by the cylinder lock 31. As a result, the decorative ring 65 moves the decorative ring 65 in the axial direction of the cylinder lock 31 even when the protruding lengths from the door surface 49a of the cylinder lock 31 are different, and the rear end surface is always located at the door surface 49a.
It is possible to cover the lock insertion hole 63 by abutting against it, and it is possible to attach the same cylinder lock 31 to the doors 49 having different thicknesses.

The outer periphery of the cylinder lock 31, that is, the spacer 5
A ring member 71 is fitted around the outer circumference of the No. 3. The ring member 71 can be fixed and fitted to the outer periphery by various means such as fixing with screws screwed in the radial direction, fixing with an adhesive, fixing with an engaging structure, and caulking. On the tip side of the inner periphery of the ring member 71, the insertion portion 7 with the inner periphery expanded
1a is provided, and the bent end 67a of the decorative ring 65 is fitted into the insertion portion 71a. The ring member 71
Can be obtained by cutting a metal such as stainless steel or cast iron.

The ring member 71 is fitted on the outer circumference of the cylinder lock 31, and the tip of the outer circumference is in contact with the inner circumference of the decorative ring 65. The ring member 71 contacts the inner circumference of the decorative ring 65 to prevent the decorative ring 65 from being deformed inward in the radial direction.

Further, the ring member 71 has a base end portion formed in a taper shape in which the outer diameter gradually decreases toward the base end. The tip of the taper portion 73 is fixed to the lock insertion hole 6
It fits in 3. Thereby, the ring member 71 and the door 4
The strength with which the cylinder lock 31 and the door 49 are integrated can be improved, and the strength with which the cylinder lock 31 is removed from the door 49 is increased. Further, the ring member 7
1 has a tapered end portion, so that the ring member 7
The lock insertion hole 63 for fitting 1 does not have to be unnecessarily large, the fixing strength of the cylinder lock 31 with respect to the door 49 is not reduced, and the cover margin by the decorative ring 65 is sufficiently secured. be able to.

According to the lock structure thus constructed, the ring member 71, which prevents the deformation of the decorative ring 65 inward in the radial direction by contacting the outer circumference with the inner circumference of the decorative ring 65, is provided inside the decorative ring 65. Since it is fitted on the outer periphery of a certain cylinder lock 31, it becomes difficult to crush the decorative ring 65 by using a tool to deform it, and the decorative ring 65 maintains a conical shape that allows a tool such as a pipe wrench to slide. As a result, it becomes difficult to grip the decorative ring 65, and it is possible to prevent the lock device as a whole from being broken by gripping the deformed decorative ring 65 and forcibly rotating the cylinder lock 31.

Next, a modification of the first embodiment will be described. FIG. 5 is a cross-sectional view showing a modified example of the first embodiment, and FIG. 6 is an explanatory view showing a front view of the ring member shown in FIG. 5 as (a) and a cross section as (b). In the following description of modified examples and embodiments, the same members as the members of the above-described embodiment shown in FIGS. 1 to 3 are designated by the same reference numerals, and duplicate description will be omitted. . Further, FIG. 5 shows the position of the decorative ring when the cylinder lock is attached to the doors of different thicknesses at the upper part and the lower part with the axis as a boundary, and FIGS. 7 and 9 used in the description of the following embodiments and modifications. The same applies to the sectional view of FIG.

The lock structure according to this modification has a ring member 8
1 is different from the first embodiment described above. While the ring member 71 is manufactured by cutting, the ring member 81 has an enlarged diameter portion 83 having a crank-shaped cross section in which the diameter of the tip of the thick steel pipe is increased by, for example, press working. The inner circumference of the expanded diameter portion 83 serves as an insertion portion 83a. The steel pipe that is the material of the ring member 81 is, for example,
An outer diameter of about 36 mm and a wall thickness of about 2 mm are used. Also in this modification, the ring member 81 is fitted on the outer circumference of the cylinder lock 31, and the tip of the expanded diameter portion 83 is in contact with the inner circumference of the decorative ring 65. That is, the ring member 81
Like the ring member 71, acts to prevent deformation of the decorative ring 65 inward in the radial direction.

The rear end of the ring member 81 is in contact with the rear end portion 51a of the fixed cylinder 51. Therefore, it is not possible to remove the decorative ring 65 and obtain a sufficient hanging margin on the outer periphery of the cylinder lock 31, so that the cylinder lock 31 can be prevented from being destroyed by gripping and prying the cylinder lock 31. You can

Therefore, even with the lock structure including the ring member 81, it becomes difficult to crush the decorative ring 65 by using a tool to deform it, and the deformed decorative ring 65 is gripped and the cylinder lock 31 is forcibly rotated. By doing so, it is possible to prevent the entire lock device from being destroyed. In addition to this,
It can be manufactured more easily than the ring member 71 obtained by cutting.

Next, a second embodiment of the lock structure according to the present invention will be described. FIG. 7 is a cross-sectional view showing a second embodiment of the lock structure according to the present invention, and FIG. 8 is an explanatory view showing a front view of the ring member shown in FIG. is there.

In the lock structure according to this embodiment, the ring member 93 having the enlarged diameter portion 91 on the tip side is attached to the decorative ring 65.
Between the inner circumference of the cylinder lock 31 and the outer circumference of the cylinder lock 31.
It is fitted to the outer periphery of the. The enlarged diameter portion 91 is formed by expanding the tip end portion of the ring member 93 into a flange shape. Further, the ring member 93 has a flange portion 95 whose rear end portion is bent inward. The collar 95 is a cylinder lock 3
By hooking on the rear end face of No. 1, the movement of the ring member 93 in the front direction (left direction in FIG. 7) is prevented. Further, the collar portion 95 abuts on the rear end portion 51a of the fixed cylinder 51, that is,
The cylinder lock 31 is substantially sandwiched between the rear end surface and the rear end portion 51a. Further, the ring member 93 has a fixing hole 96,
The fixing hole 96 is also engaged with the spacer 53 or the cylinder lock 31 itself to prevent movement with respect to the cylinder lock 31. The ring member 93 is obtained by, for example, pressing a steel pipe. The steel pipe has a wall thickness of about 1 mm for an outer diameter of about 36 mm, for example.

According to this lock structure, the ring member 93 having the flange-shaped expanded portion 91 on the tip side is attached to the cylinder lock 31.
Even if the decorative ring 65 is removed, the expanded diameter portion 91 of the ring member 93 is projected from the exposed outer periphery of the cylinder lock 31 by fitting the outer peripheral surface of the ring lock 93. Therefore, a sufficient locking margin cannot be obtained on the outer periphery of the cylinder lock 31, and by grasping and twisting the cylinder lock 31, it is possible to prevent breakage of the entire locking device that tears off the cylinder lock 31.

Next, a modified example 1 of the second embodiment will be described. FIG. 9 is a sectional view showing a modified example 1 of the second embodiment, and FIG. 10 is an explanatory view showing a front view of the ring member shown in FIG. 9 in (a) and a sectional view in (b). In the lock structure according to this modification, the ring member 101 is different from that in the second embodiment. That is, while the tip of the ring member 93 is formed by the flange-shaped expanded portion 91, the ring member 101 is formed by the expanded portion 103 whose tip is crank-shaped in cross section. Further, the ring member 101 has a flange 95 at the rear end similarly to the ring member 93. Further, the ring member 101 has a fixing hole 96, and the movement with respect to the cylinder lock 31 is also prevented by engaging the fixing hole 96 with the spacer 53 or the cylinder lock 31 itself. This ring member 101 is also obtained by pressing a steel pipe, for example. The steel pipe has a wall thickness of about 1 mm for an outer diameter of about 36 mm, for example.

According to this lock structure, similarly to the above-described second embodiment using the ring member 93, even if the decorative ring 65 is removed, from the exposed outer periphery of the cylinder lock 31, a ring is formed. Since the expanded diameter portion 103 of the member 101 projects, it is not possible to obtain a sufficient engagement allowance, and it is possible to prevent the lock device as a whole from being broken even if the cylinder lock 31 is gripped. In addition, since the expanded diameter portion 103 is bent in a crank shape in cross section, the strength of the expanded diameter portion 103 in the axial direction and the radial direction can be increased.

Next, a modified example 2 of the second embodiment will be described. FIG. 11 is a cross-sectional view showing a modified example 2 of the second embodiment, and FIG. 12 is an explanatory view showing the front view of the ring member shown in FIG. 11 as (a) and the cross section as (b). The lock structure according to this modification is different in the ring member 111 from the second embodiment. That is, the tip end of the ring member 93 is formed by the flange-shaped enlarged diameter portion 91, while the ring member 111 has a substantially C-shaped cross section in which the tip end is bent outward. It is formed by the enlarged diameter portion 113. Further, the ring member 111 has a flange portion 95 at the rear end similarly to the ring member 93. Further, the ring member 111
Has a fixing hole 96.
Alternatively, by engaging the cylinder lock 31 itself,
Movement of the cylinder lock 31 is blocked. The ring member 111 is also obtained by pressing a steel pipe, for example. For example, a steel pipe has a diameter of 1 mm for an outer diameter of 36 mm.
Use a thick wall.

According to this lock structure, similar to the second embodiment using the ring member 93, even if the decorative ring 65 is removed, the ring from the exposed outer periphery of the cylinder lock 31 is removed. Since the expanded diameter portion 113 of the member 111 projects, it is not possible to obtain a sufficient engagement allowance, and it is possible to prevent the lock device as a whole from being broken even if the cylinder lock 31 is gripped. In addition to this, since the expanded diameter portion 113 is bent in a C-shaped cross section, the strength in the axial direction and the radial direction can be increased. Particularly, compared to the ring member 93 according to the second embodiment and the ring member 101 according to the first modification, the expanded diameter portion 113 can increase the strength against the compressive force from the outside in the radial direction. It is possible to obtain the same effect of suppressing the deformation of the decorative ring 65 as in the case of the above.

[0036]

As described above, according to the lock structure of the present invention, the ring member for contacting the outer circumference with the inner circumference of the decorative ring to prevent the decorative ring from being deformed radially inward,
Since it is fitted on the outer periphery of the cylinder lock, it becomes difficult to crush the cosmetic ring by using a tool to deform the cosmetic ring, and the cosmetic ring maintains a conical shape for sliding a tool such as a pipe wrench. As a result, it becomes difficult to grip the cosmetic ring, and it is possible to prevent the lock device as a whole from being destroyed by gripping the deformed cosmetic ring and forcibly rotating the cylinder lock.

Further, according to the lock structure of the present invention, the base end portion of the ring member is formed in a taper shape whose outer diameter gradually decreases toward the base end, and the tip end of the taper portion has a lock insertion hole. Since the ring member is directly inserted into the lock insertion hole of the door, the strength of the ring member and the door can be improved, and the strength of the cylinder lock and the door can be improved. As a result, the peeling strength of the cylinder lock from the door is increased. Further, since the base end portion of the ring member is a tapered portion, the lock insertion hole for fitting the ring member need not be made larger than necessary, and the fixing strength of the cylinder lock to the door is not reduced. It is possible to secure a sufficient cover margin with the makeup ring.

Further, according to the lock structure of the present invention, the ring member having the enlarged diameter portion on the distal end side is fitted to the outer circumference of the cylinder lock between the inner circumference of the decorative ring and the outer circumference of the cylinder lock. Even if the decorative ring is removed, the expanded diameter portion of the ring member will protrude from the exposed outer periphery of the cylinder lock, and it is not possible to obtain a sufficient hanging margin on the outer periphery of the cylinder lock. It is possible to prevent the lock device as a whole from breaking the cylinder lock by breaking the lock by gripping the lock.

[Brief description of drawings]

FIG. 1 is a sectional view showing a first embodiment of a lock structure according to the present invention.

FIG. 2 is a front view of FIG.

FIG. 3 is a plan view of a key used in the lock structure of FIG.

FIG. 4 is an explanatory diagram showing a front view of the ring member shown in FIG. 1 in (a) and a cross section in (b).

FIG. 5 is a cross-sectional view showing a modified example of the first embodiment.

6 is an explanatory view showing a front view of the ring member shown in FIG. 5 as (a) and a cross section as (b).

FIG. 7 is a cross-sectional view showing a second embodiment of the lock structure according to the present invention.

8 is an explanatory view showing a front view of the ring member shown in FIG. 7 as (a) and a cross section as (b).

FIG. 9 is a cross-sectional view showing a modified example 1 of the second embodiment.

10 is a front view of the ring member shown in FIG.
It is explanatory drawing which represented the cross section by (b).

FIG. 11 is a cross-sectional view showing a modified example 2 of the second embodiment.

12 is an explanatory view showing a front view of the ring member shown in FIG. 11 as (a) and a cross section as (b).

FIG. 13 is a cross-sectional view of a conventional lock structure.

[Explanation of symbols]

31 ... Cylinder lock 49 ... Door 49a ... Door surface 63 ... Lock insertion hole 65 ... Makeup ring 69 ... Coil spring 71, 93, 101, 111 ... Ring member 73 ... Tapered portion 91, 103, 113 ... Expanded portion

Claims (3)

[Claims] 1. A base end of a cylinder lock is fixed to a lock box provided in a door through a lock insertion hole formed in the door surface, and a tip end side is attached to an outer periphery of the cylinder lock protruding from the door surface. A substantially conical decorative ring having an opening is externally inserted so that the front end is on the front end side of the cylinder lock, and the rear end of the decorative ring is attached to the door by the biasing force of a coil spring externally supported by the cylinder lock. In the lock structure that abuts against the surface, a ring member that abuts the outer circumference against the inner circumference of the decorative ring to prevent deformation of the decorative ring inward in the radial direction is fitted to the outer circumference of the cylinder lock. And lock structure. 2. The lock structure according to claim 1, wherein the base end portion of the ring member is formed in a taper shape whose outer diameter gradually decreases toward the base end, and the tip end of the taper portion is formed into the lock. A lock structure characterized by being inserted into the insertion hole. 3. The base end of a cylinder lock is fixed to a lock box provided in the door through a lock insertion hole formed in the door surface, and the tip end side is attached to the outer periphery of the cylinder lock protruding from the door surface. A substantially conical decorative ring having an opening is externally inserted so that the front end is on the front end side of the cylinder lock, and the rear end of the decorative ring is attached to the door by the biasing force of a coil spring externally supported by the cylinder lock. In the lock structure abutting on the surface, a ring member having a diameter-expanded portion on the tip side is fitted to the outer circumference of the cylinder lock between the inner circumference of the decorative ring and the outer circumference of the cylinder lock. Lock structure.