JP2867020B2 - 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 in which a tumbler is set by inserting a key, and more particularly, to a cylinder lock formed so as to prevent an unlocking operation by an electric drill or the like.

[0002]

2. Description of the Related Art As a conventional cylinder lock of this type, there is a cylinder lock formed as shown in FIG. That is, in this conventional product, a steel lid d having a keyhole c is fitted to a front end of an outer cylinder b in which an inner cylinder a is loaded, and a groove e is formed on a peripheral side surface of the lid d along a circumferential direction. A groove g is formed in an annular shape along the circumferential direction at an inner peripheral surface position of the enlarged cylindrical portion f of the outer cylinder b corresponding to the groove e, and the groove g and the groove e are formed. A ring i is provided in the annular space h, and the lid d is attached to the outer cylinder b with the ring i.

[0003]

By the way, in the case of the above-mentioned conventional product, the groove formed on the peripheral side surface of the lid is formed deeply so that the ring is completely buried in this groove (see the state of chain line in FIG. 9A). . This is the case with this type of conventional cylinder lock, when attaching the lid to the outer cylinder, shrink the ring so as to be buried in the groove of the lid, and in this state, insert the lid together with the ring into the front end of the outer cylinder and fit it, This is because the lid was fixed to the outer cylinder by the ring restored in the annular space.

Therefore, according to the conventional product, although the steel lid can prevent the unlocking operation using the electric drill,
For example, when a flathead screwdriver or the like is inserted into the keyhole of the lid and a force is applied to return the cutting edge to the outside, as shown in FIG. 9B, the ring i is pushed by the corner j of the groove g and pushed back into the groove e. d might be forcibly removed from the outer cylinder b as shown by the arrow.

As a result, this kind of conventional cylinder lock is incomplete or inadequate against the force of forcibly opening the lid by forcibly opening the lid with a tool such as a flathead screwdriver, even if it can be prevented from being broken by an electric drill. There was a point.

[0006] The present invention is to solve such a problem of the conventional product. Accordingly, the technical problem of the present invention is to prevent not only the act of unlocking without a power drill but also the act of completely unlocking the lid by forcibly opening the lid by inserting a flathead screwdriver or the like into the keyhole. The purpose of the present invention is to provide an improved cylinder lock.

[0007]

The present invention employs the following technical means to solve the above-mentioned problems. That is, in the cylinder lock of the present invention, a steel lid 3 having a keyhole 3a is fitted to the front end of the outer cylinder 2 in which the inner cylinder 1 is loaded.
A groove 5 is formed in a ring shape along the circumferential direction on the peripheral side surface, and a groove 6 is formed in a ring shape along the circumferential direction at an inner circumferential surface position of the enlarged cylindrical portion 2a of the outer cylinder 2 corresponding to the groove 5. A ring 7 is disposed in an annular space S formed by the groove 6 and the groove 5 of the lid 3, and in the cylinder lock in which the lid 3 is attached to the outer cylinder 2 with the ring 7, A slit 8 having the same width as the groove 6 of the outer cylinder 2 is formed at a position corresponding to the groove 6 of the outer cylinder 2 on the outer peripheral surface of 2a along the circumferential direction,
Both ends 7a of the ring 7 are bent inward respectively,
The hole 5a into which both ends 7a of the ring 7 are fitted is
Formed in the groove 5.

In this case, according to the present invention, the length of the slit 8 is set so that the hole 5a into which the _one end 7a ₁ (see FIG. 3) of the ring 7 is fitted can be easily checked when the ring 7 is wound. ,
It is preferable that the distance be slightly longer than the distance D (see FIG. 1A) between both ends 7a of the ring 7. However, in the case of the present invention, the length of the slit 8 is not limited by the distance D between both ends 7 a of the ring 7. That is, the length of the slit 8 may be selected to be shorter or longer than the distance D between both ends 7a of the ring 7, and in short, both ends 7a of the ring 7 fit into the holes 5a. As described above, the holes 5a may be formed at positions corresponding to both ends 7a of the ring 7.

According to the present invention, one end 7b of the ring 7 is replaced with the end 7a of the ring 7 instead of being bent inward.
(See FIG. 7 and the like) may be bent inward, and a hole 5b into which one end 7b of the ring 7 fits may be formed in the groove 5 of the lid 3. In this case, since only one end 7b of the ring 7 is required to be bent and the hole 5b formed in the groove 5 is required at one place, there is an advantage that the processing is simplified.

[0010]

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 is an inner cylinder, 2 is an outer cylinder in which the inner cylinder 1 is loaded. Reference numeral 3 denotes a steel lid provided with a keyhole 3a, which is fitted to the front end of the outer cylinder 2. 4 is the outer cylinder 2
Is a cover fitted in an outer shape to the enlarged cylindrical portion 2a. Preferably, the lid 3 is quenched to increase the hardness.

The cover 3 has a groove 5 formed in a ring shape along the circumferential direction on the circumferential side surface. A groove 6 is formed in an annular shape along the circumferential direction at an inner peripheral surface position of the enlarged cylindrical portion 2a of the outer cylinder 2 corresponding to the groove 5.

S (see FIG. 1B) is an annular space formed by the grooves 5 and 6, and 7 is a ring disposed in the annular space S. The lid 3 is attached to the outer cylinder 2 with the ring 7.

As shown in FIG. 1A, a slit 8 is formed at a position corresponding to the groove 6 on the outer peripheral surface of the enlarged cylindrical portion 2a along the circumferential direction. This slit 8 is selected to have the same width as the groove 6 of the outer cylinder 2. In this embodiment, the length of the slit 8 is selected to be slightly longer than the distance D between both ends 7a of the ring 7.

The above-mentioned ring 7 has both ends 7a bent inward. Both ends 7 a of the ring 7 are fitted into holes 5 a formed in the grooves 5 of the lid 3. The holes 5a correspond to both ends 7a of the ring 7,
The grooves 5 are formed in the groove 5 with the above interval D.

Next, an example of assembling the cylinder lock of the present invention will be described. First, as shown in FIG. 3, the operator fits _one end 7a1 of the ring 7 into _one of the holes 5a, and then, in this state, inserts a flathead screwdriver 9 into the keyhole 3a of the lid 3.
And then rotate clockwise.

Then, as shown in FIG. 4, the ring 7 is rolled into the annular space S formed by the grooves 5, 6 according to the rotation state of the lid 3. When the other hole 5a is exposed from the slit 8 (see the state of FIG. 5), the other end portion 7a ₂ of the ring 7 is fitted into the hole 5a. In this state, the operator further rotates the lid 3 until the keyhole 3a is vertically arranged as shown in FIG. 6, for example.

Therefore, in the case of the present invention, the above-mentioned ring 7 is perfectly arranged without any gap in the annular space S as shown in FIG. 1B and the like. When replacing the Naofuta 3, first through the slit 8 solving e.g. fitted state of the one end portion 7a ₁ of the ring 7. Then put this end 7a ₁ out of the slit 8, then the lid 3 as above Example is rotated clockwise to discharge the ring 7 from slit 8,
This is performed by releasing the fixed state of the lid 3.

In the above process, according to the present invention, instead of bending both ends 7a of the ring 7 inward, as shown in FIGS. 7 and 8, only one end 7b of the ring 7 is inwardly bent. A hole 5b into which the one end 7b of the ring 7 is fitted may be formed in the groove 5.

In this case, as compared with the above example, the ring 7 can be formed by bending only one end 7b and the hole 5b formed in the groove 5 can be formed at only one place. is there. The assembling operation is performed by inserting the ring 7 into the hole 5b.
This is performed by fitting the one end 7b of the second member and then turning the lid 3, which is the same as the above example.

[0020]

As described above, according to the present invention, the ring is wound into the annular space while rotating the lid through the slit formed in the enlarged cylindrical portion of the outer cylinder, and the lid is fixed to the outer cylinder with this ring. Things.

Therefore, in the case of the present invention, it is not necessary to form the groove on the peripheral side surface of the lid as deeply as in the conventional product, and the ring is arranged exactly without any gap in the annular space. Therefore, even if a screwdriver is inserted into the keyhole of the lid and a force is applied outward through the screwdriver, for example, the ring is not pushed at the corner of the groove of the outer cylinder unlike the conventional product. As a result, according to the present invention, not only can the steel lid prevent the unlocking operation by the electric drill,
The act of forcibly opening the lid using the keyhole can also be completely prevented.

In the case where the length of the slit is selected to be slightly longer than the distance between both ends of the ring, the hole into which one end of the ring is fitted when the ring is wound. Therefore, there is an advantage that the operation of winding the ring can be facilitated.

Further, instead of bending both ends of the ring inward, only one end of the ring is bent inward, and a hole for fitting one end of the ring is formed in the lid. In the case where the ring is formed in a groove, only one end of the ring is required to be bent, and only one hole is formed in the groove of the lid. Therefore, according to this, there is an advantage that the cylinder lock can be provided which is simple in processing and inexpensive.

[Brief description of the drawings]

FIG. 1 shows a preferred embodiment of the cylinder lock of the present invention,
A is an exploded perspective view, and B is a longitudinal sectional view of a main part.

FIG. 2 is an exploded perspective view showing an assembling stage of the cylinder lock.

FIG. 3 is a partially cutaway longitudinal sectional view for explaining an assembling operation of the cylinder lock.

FIG. 4 is a partially cutaway longitudinal sectional view for explaining an assembling operation of the cylinder lock.

FIG. 5 is a partially cutaway longitudinal sectional view for explaining an assembling operation of the cylinder lock.

FIG. 6 is a partially cutaway longitudinal sectional view for explaining an assembling operation of the cylinder lock.

FIG. 7 is an exploded perspective view of a main part showing another embodiment of the cylinder lock of the same.

8 is a vertical sectional view of a main part of the embodiment of FIG. 7 after assembly.

FIG. 9 shows a conventional example, and is a longitudinal sectional view of an essential part in which both A and B are partially cut away.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Inner cylinder 2 Outer cylinder 2a Enlarged cylinder part 3 Lid 3a Keyhole 5 Lid groove 5a hole 6 Groove of outer cylinder 7 Ring 7a Both ends 8 Slit S Annular space

Continuation of the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) E05B 15/00-15/02 E05B 17/00 E05B 17/14 E05B 17/18

Claims (3)

(57) [Claims] 1. A steel lid provided with a keyhole is fitted to the front end of an outer cylinder in which an inner cylinder is loaded, and a groove is formed in a circumferential shape on the peripheral side surface of the lid along the circumferential direction. A groove is formed annularly along the circumferential direction at the inner peripheral surface position of the enlarged cylindrical portion of the outer cylinder corresponding to the above, and a ring is disposed in an annular space formed by this groove and the groove of the lid, and this ring In the cylinder lock in which the lid is attached to the outer cylinder, a slit having the same width as the groove of the outer cylinder is provided at a position corresponding to the groove of the outer cylinder on the outer peripheral surface of the enlarged cylindrical portion along the circumferential direction. A cylinder lock, wherein a length is formed, both ends of the ring are bent inward, and holes for fitting both ends of the ring are formed in grooves of the lid. 2. The length of the slit is selected to be slightly longer than the distance between both ends of the ring.
Cylinder lock as described. 3. Instead of bending both ends of the ring inward, respectively, only one end of the ring is bent inward, and a hole into which one end of the ring fits is formed in the groove of the lid. The cylinder lock according to claim 1, wherein