JP3137830B2 - Cylinder lock - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylinder lock, and more particularly to a cylinder lock which is resistant to breakage.

[0002]

2. Description of the Related Art Cylinder locks are used in various fields, including buildings and vehicles. The cylinder lock has a case, a key cylinder disposed in the case, and a lever attached to an inner end of the key cylinder and operatively connected to a locking device. The key cylinder is provided with a plurality of tumblers urged to the outside of the key cylinder by a tumbler spring.When a specific key is inserted into the key cylinder, the tumbler moves to a position where it is retracted into the key cylinder, and Can be rotated.

[0003] The case and the key cylinder can be formed of various materials, but are particularly formed of zinc die-casting which is easy to form and resistant to breakage. In the case of manufacturing by zinc die casting, molten zinc is cast under pressure into a cavity of a mold for mass production.

[0004] For example, as disclosed in Japanese Patent Publication No. 55-50147, a door lock device for an automobile uses a cylinder lock provided with a key rotor and a rear rotor in a casing. By inserting and rotating the key in the key rotor, the door of the automobile can be locked or unlocked.

The cylinder lock disclosed in the above publication has a structure in which a pressing body is movably disposed in a casing, and a key rotor is provided inside the pressing body. The key rotor is held inside the pressing body by a metal cover. The cover is formed by pressing a thin stainless steel plate.

Since the cover is thin, it can be easily broken by a tool. If the cover is broken, the door can be unlocked by rotating the rear rotor after removing the key rotor. Therefore, the conventional cylinder lock having a rear rotor has a low resistance to destruction, and has a disadvantage that theft cannot be sufficiently prevented. On the other hand, as described above, since the length of a cast product is limited in zinc die casting, it is difficult to integrally cast the key rotor and the rear rotor. In addition, since a dedicated mold is used, a mold corresponding to the difference in the length of the cylinder is required.

Further, the inner cylinder structure of a cylinder lock disclosed in Japanese Utility Model Laid-Open Publication No. 64-18263 and Japanese Utility Model Laid-Open Publication No.
The lock disclosed in Japanese Patent Application Laid-Open Publication No. H10-209139 also shows a conventional structure of a similar cylinder lock. Further, Japanese Utility Model Laid-Open Publication No. 63-26390 discloses a locking device for a game machine.

FIG. 5 shows a sectional structure of a conventional cylinder lock. In this cylinder lock, a case 1, a key cylinder 2 having one end rotatably disposed in the case 1 and provided with a key hole (not shown), and a key cylinder 2 disposed in the case 1 and provided coaxially with the key cylinder 2. And a lever 4 attached to one end of the rotor 3 and operatively connected to a locking device (not shown). The lever 4 is attached to one end 6 of the rotor 3 by an E-ring 5. Lever 4
, One end of a return spring 7 is attached, and the other end of the return spring 7 is fixed to the case 1. When the key cylinder 2 rotates in the unlocking direction, the return spring 7 applies an elastic force to the lever 4 to return to the initial position before the rotation. The case 1 has a front sleeve 10, a flange 11 projecting radially from the front sleeve 10, and a rear flange 12 extending rearward from the flange 11. The flange 11 has a hole 11a for attaching the case 1 to a fixing portion (not shown). Also, the front sleeve 1
A cover 13 is attached to the cover 0.

As shown in FIG. 6, a rotor 3 includes a rotor body 3a and a protrusion 2 provided at one end 6 of the rotor body 3a.
0 and a concave portion 23 provided at the other end 22 of the rotor body 3a.
And an engaging portion 25 further provided at the other end 22 and forming a radial cutout portion 24. As shown in FIG. 5, the key cylinder 2 includes a cylinder body 26 and a cylinder body 26.
And a head part 29 provided at the other end of the cylinder body 26. Key holes are formed in the head portion 29 and the cylinder body 26. As is well known, a tumbler groove 26a in which a plurality of tumblers 30 are mounted is formed in the cylinder body 26. As shown in FIG. 7, the cross section of one end 27 of the cylinder body 26 has a columnar projection 27a and a pair of lugs 27b projecting radially from the columnar projection 27a. The lug 27b of the cylinder main body 26 is provided in the recess 23 of the rotor main body 3a.
Abuts on the end face 23a of the rim.

At the time of assembly, the projection 28 is fitted into the notch 24 of the rotor 3, and the rotor 3 and the key cylinder 2 are mounted in the case 1. The lever 4 comes into contact with the case 1 and the step 3a of the rotor 3 comes into contact with the step 12a of the rear flange 12, thereby preventing the rotor 3 and the key cylinder 2 from moving outward in the axial direction.

In the above configuration, when the key is inserted into the key hole of the key cylinder 2 and rotated against the elasticity of the return spring 7, the lug 27b of the cylinder main body 26 is brought into contact with the end surface 23a of the concave portion 23 of the rotor main body 3a. , The torque is transmitted from the key cylinder 2 to the rotor 3. When the key is released, the key and the key cylinder 2 are automatically returned to the initial position by the return spring 7. When the key cylinder 2 is illegally extracted by removing the cover 13, the projection 28 of the key cylinder 2
, The key cylinder 2 is connected to the rotor 3, and the lever 4 comes into contact with the case 1 so that the key cylinder 2
Is prevented from moving outward in the axial direction. Therefore, even if the cover 13 is removed from the key cylinder 2, the key cylinder 2 cannot be taken out of the case 1, and illegal unlocking can be prevented.

[0012]

By the way, as shown in FIG. 7, in the conventional cylinder lock, when the rotational force Fa is transmitted from the key cylinder 2 to the rotor 3, the cylinder body 2
6 lug 27b is the end surface 23 of the concave portion 23 of the rotor body 3a.
a, a downward eccentric force Fb acts on the rotor body 3a in addition to the rotational force Fa. For this reason,
There are disadvantages in that the sliding resistance of the rotor 3 during rotation is large, the operation feeling of the operator when rotating with a key is deteriorated, and the automatic return by the elasticity of the return spring 7 is defective. In addition, it is necessary to reliably prevent the key cylinder 2 from dropping from the rotor 3 against illegal destruction.

SUMMARY OF THE INVENTION An object of the present invention is to provide a cylinder lock in which an eccentric force is not generated in a rotor and which has high resistance to breakage.

[0014]

A cylinder lock according to the present invention comprises a case, a key cylinder rotatably disposed in the case, and a rotor coaxially disposed with the key cylinder and operatively connected to a lock device. , A radial projection formed at one end of the key cylinder or the rotor, and a radial engaging portion formed at the other end of the key cylinder or the rotor. The rotation of the key cylinder is transmitted to the rotor by the engagement between the key cylinder and the rotor, and the radial projection is locked to the radial engagement portion to prevent the key cylinder from moving in the axial direction. In this cylinder lock, a convex portion having a non-circular cross section is provided at one end of the key cylinder or the rotor, and a complementary concave portion into which the convex portion having the non-circular cross section is fitted is provided at the other end of the key cylinder or the rotor. Form. The axial length at the position where the projection is locked to the engagement portion is made larger than the depth of the concave portion, so that the key cylinder can be fitted to the rotor.

In the embodiment of the present invention, a columnar projection as a non-circular cross section and a pair of lugs projecting radially from the columnar projection are provided at the other end of the key cylinder. A mating complementary shaped recess is formed at the other end of the rotor. The recess has a cylindrical depression and a pair of notches extending radially outward, and the columnar projection and the lug are fitted to the depression and the pair of notches. A radial notch passing through the end of the key cylinder is connected to the recess.

[0016]

When the key cylinder and the rotor are arranged in the case, the ends of the key cylinder are passed through the notches, and the notches provided in one end of the key cylinder and the rotor in the radial direction are inserted into the other end. Engage the radial projection provided on the part. Next, the key cylinder and the rotor are relatively close to each other in the axial direction so that the concave portion and the convex portion are easily fitted to each other. Then, the combined body is inserted into the case and arranged. When the key is inserted into the key hole of the key cylinder and rotated, the eccentric force is canceled by the engagement between the pair of lugs and the concave portion, and the rotation of the key cylinder is reliably transmitted to the rotor. Further, the protrusion protruding radially outward can be fitted into the radial cutout to prevent the key cylinder from being pulled out.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a cylinder lock according to the present invention will be described below with reference to FIGS. In these drawings, FIG.
7 are assigned the same reference numerals as those shown in FIG.
Description is omitted.

A cylindrical projection 27a is formed as a projection having a non-circular cross section.
And a pair of lugs 27b and a tip portion 27c with the key cylinder 2
Is formed at one end 27. A lug 27b is not formed on the distal end portion 27 passing through the notch 31c. The key cylinder 2 is provided with a projection 28 that protrudes in the radial direction.
On the other hand, the rotor 3 has a cylindrical recess 31 having a shape complementary to the cylindrical protrusion 27a and the pair of lugs 27b.
a, and a pair of notches 31b in the axial direction extending radially outward
, And a radial notch 31c communicating with the concave portion 31 are formed. The notch 31c is for releasing the tip 27c of the one end 27 where the lug 27b is not formed, and can connect an existing key cylinder. Projection 2 in radial cutout 24 of locking portion 25
8 is larger than the insertion depth L2 of the one end 27 of the cylinder body 26 (L1> L2), and the projection 28 is formed in the notch 24 of the rotor 3 so that the one end 27 can be disengaged from the recess 31. It has an interval that can move in the axial direction.

At the time of assembling, the tip end portion 27c of the key cylinder 2 having passed through the radial notch 31c is arranged in the concave portion 31, and the key cylinder 2 and the rotor are inserted with the projection 28 inserted into the cutout portion 24. 3 can be relatively approached so that the columnar projection 27a and the recess 31 can be easily fitted.
In this state, the key cylinder 2 and the rotor 3 are housed in the case 1 to assemble the cylinder lock.
When the user attempts to illegally pull out from the case 1, the columnar projection 27 a comes out of the recess 31, but the projection 28
5, the key cylinder 2 is not separated from the rotor 3.

Also, at the time of assembling, the cylindrical projection 27a and the lug 27b are fitted with the recess 31a and the pair of notches 31b, and both the pair of lugs 27b of the key cylinder 2 are brought into contact with the notches 31b. When the key is inserted into the key hole of the key cylinder 2 and rotated, the upper and lower eccentric forces Fb cancel each other out due to the engagement between the pair of lugs 27b and the pair of depressions 31a, and the rotation of the key cylinder 2 in a well-balanced manner. The force Fa is transmitted to the rotor 3. In this way, the rotational force of the key cylinder 2 can be transmitted to the rotor 3 with good balance while rotating the key cylinder 2 and the rotor 3 integrally.

In the above embodiment, a columnar projection 27a and a pair of lugs 27b projecting radially from the columnar projection 27a.
Are provided at the end of the key cylinder 2 and the complementary recess 31a in which the cylindrical protrusion 27a and the lug 27b are fitted is formed at the end of the rotor 3. On the contrary, the cylindrical protrusion and the cylindrical protrusion are formed. And a pair of lugs projecting radially from the rotor 3 may be provided, and a recess may be formed in the key cylinder 2. A protrusion protruding radially outward may be provided on the rotor 3, and a radial cutout may be provided on the key cylinder 2. Various shapes can be used for the convex and concave portions having a non-circular cross section. Further, it is clear that the cylinder lock of the present application can be applied to doors or opening / closing parts of other closed parts such as vehicles such as automobiles and buildings.

[0022]

As described above, according to the present invention, the rotor of the cylinder lock, which can prevent unauthorized removal of the key cylinder, can be rotated without eccentric force, so that the operation of the cylinder lock becomes smooth, and a problem due to abnormal wear of the rotor occurs. Can be avoided.

[Brief description of the drawings]

FIG. 1 is a sectional view of a cylinder lock according to the present invention.

FIG. 2 is a perspective view of a rotor used for the cylinder lock of FIG. 1;

FIG. 3 is a longitudinal sectional view of a rotor used for the cylinder lock of FIG. 1;

FIG. 4 is a cross-sectional view of the rotor of FIG. 1 when a rotational force is applied.

FIG. 5 is a sectional view of a conventional cylinder lock.

FIG. 6 is a perspective view of a rotor used for the cylinder lock of FIG. 5;

FIG. 7 is a cross-sectional view of the rotor of FIG. 6 when a rotational force is applied.

[Explanation of symbols]

1. . Case, 2. . Key cylinder, 3. . Rotor, 4. . Lever, 27a. . Cylindrical protrusion, 27
b. . Rugs, 31. . Recess, 31a. . Hollow, 31
b. . Notch,

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-54-77915 (JP, A) JP-A-63-102863 (JP, U) JP-A-64-18263 (JP, U) JP-A 64-64 18264 (JP, U) Hira 3-2158 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) E05B 29/04 E05B 17/04 E05B 27/02 E05B 27/04 E05B 27/06

Claims (3)

(57) [Claims] 1. A case, a key cylinder rotatably arranged in the case, a rotor arranged coaxially with the key cylinder and operatively connected to a lock device, and a key cylinder or one end of the rotor. A radial projection formed,
A radial engagement portion formed at the other end of the key cylinder or the rotor, the rotation of the key cylinder being transmitted to the rotor by the engagement of the key cylinder and the rotor, and the radial projection being formed in the radial direction. In a cylinder lock that locks to an engaging portion to prevent the key cylinder from moving in the axial direction, a convex portion having a non-circular cross section is provided at one end of the key cylinder or the rotor, and the convex portion having a non-circular cross section is fitted. A concave portion having a complementary shape is formed at the other end of the key cylinder or the rotor, and the axial movement distance at the position where the projection is locked to the engagement portion is substantially the depth of the recess into which the projection is fitted. A cylinder lock characterized by being larger than the above and enabling the key cylinder and the rotor to be fitted. 2. A cylindrical projection as a projection having a non-circular cross section,
A pair of lugs projecting radially from the columnar projection are provided at the end of the key cylinder, and a complementary recess is formed at the end of the rotor in which the columnar projection and the lug are fitted. The cylinder lock according to claim 1, further comprising a recess and a pair of notches extending radially outward, wherein the columnar protrusion and the lug are fitted to the recess and the pair of notches. 3. The cylinder lock according to claim 1, wherein a radial notch passing through an end of the key cylinder is connected to the recess.