JP2006214153A - Cylinder lock - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cylinder lock capable of preventing an unlawful unlocking by breaking a tumbler by violently turning the inner cylinder of the cylinder lock in a locking state. <P>SOLUTION: A pair of slits 7 and 7 vertical to a pivoting axis of the inner cylinder are symmetrically formed in the central part along the pivoting axis of the inner cylinder 2 of a pin cylinder lock by pinching the pivoting axis, and make it a stress concentration part. When the inner cylinder 2 is violently twisted for the purpose of the unlawful unlocking, shear stress of the stress concentration part having a remarkably small cross sectional area in comparison with the other part is made reach shear breaking strength in advance of the other part, and the stress concentration part is selectively broken. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a cylinder lock, and more particularly to a cylinder lock that can prevent unauthorized unlocking of a type in which an inner cylinder is forcibly rotated to destroy a tumbler.

  For example, as shown in FIG. 2 of Patent Document 1 below, a pin cylinder lock, which is a kind of cylinder lock, has a joint portion between a tumbler pin and a driver pin that are not numbered when the joint key 15 is inserted into the key hole. Since the inner cylinder 3 can be rotated, the dead bolt operating member such as a dharma is controlled by turning the key 15 through the tail piece 13.

Also, in the so-called disc tumbler lock described in Patent Document 2, when a key is inserted into the key hole 3, both ends of the disc tumbler 4 are aligned with a shear line that is a fitting portion between the inner cylinder and the outer cylinder, and the inner cylinder 1 is It can be turned.
Japanese Examined Patent Publication No. 06-074684 JP 11-315654 A

  Normally, the cylinder lock is locked by utilizing the fact that the tumbler straddles the shear line during locking and the inner cylinder cannot rotate.

  However, in the locked state in which the key is removed from the key hole, the key hole is exposed to the external space.For example, a flathead screwdriver is inserted into this key hole, and if explained in detail, the inner cylinder is removed using a booster device that is contrary to public order and morals. If it is forcibly turned, the tumbler is sheared or plastically deformed in some cases, and the inner cylinder can be rotated. Therefore, such a rough type of illegal unlocking is not necessarily impossible.

  Therefore, an object of the present invention is to provide a cylinder lock that makes it impossible to perform unauthorized unlocking of a type that attempts to destroy the tumbler by forcibly turning the inner cylinder.

  In order to achieve the above object, the invention described in claim 1 is characterized in that a stress concentration portion is formed at least at one position along the rotation axis of the inner cylinder of the cylinder lock.

  The invention described in claim 2 is characterized in that a shear fracture strength reducing portion is formed in at least one place along the axis of the inner cylinder.

  In the cylinder lock according to the first aspect of the present invention configured as described above, when a tool is inserted into the keyhole and turned forcefully, the stress concentration portion of the inner cylinder is selectively sheared, resulting in stress concentration. Since the tail piece of the inner cylinder and the dead bolt control member engaged with the inner cylinder tail piece do not move only by idling the outside of the part, the unauthorized unlocking cannot be performed after all.

  Further, in the cylinder lock according to the second aspect of the present invention, when a tool is inserted into the keyhole and turned forcibly, the shear fracture strength reducing portion of the inner cylinder is selectively sheared, resulting in shear fracture strength. Since the inner cylinder tailpiece and the deadbolt control member engaged therewith do not move only by the idling of the outside from the reduction portion, the unauthorized unlocking cannot be performed after all.

  Even if the outer part of the inner cylinder that has been torn off due to shearing can be removed from the outer cylinder, the dead bolt control member is covered with the inner part of the inner cylinder locked to the outer cylinder. In addition, there are various effects such as that further unauthorized unlocking operation is impossible.

  Incorrect answer by breaking the tumbler by forcibly turning the inner cylinder of the cylinder lock with a simple configuration that reduces the cross-sectional area of at least one point along the axis of the inner cylinder or provides a shear fracture strength reduction portion. The lock can be prevented.

Embodiments of the present invention will be described below with reference to the drawings.
In FIG. 1, reference numeral 1 denotes an outer cylinder of the pin cylinder lock, and reference numeral 2 denotes an inner cylinder. A lock state in which the key 3 is not inserted into the key hole of the pin cylinder lock or a different key different from the key is used as the keyhole. When inserted into the, the tumbler pin 4 or the driver pin 5 straddles the shear line 6, so that the inner cylinder 2 is fixed relative to the outer cylinder 1.

  As shown in FIG. 2, the pin key 3 of the pin cylinder lock in the illustrated embodiment has two rows of bowl-shaped pin holes arranged in the wide portion of the stem portion inserted into the key hole. The tumbler pins shown in FIG. 1 are engaged with the pin hole group in the first row, but the tumbler pins (not shown) are engaged obliquely with the pin hole group in the second row.

  However, since the structure of such a pin cylinder lock itself is not the gist of the present invention, further detailed explanation is omitted.

  As shown in FIGS. 3 and 4, a pair of slits 7, 7 perpendicular to the rotation axis of the inner cylinder have a rotation axis at the center along the rotation axis of the inner cylinder of the pin cylinder lock having the above structure. It is formed symmetrically with a sandwich, and a stress concentration portion is formed here.

  As described above, the inner cylinder of the pin cylinder lock configured as described above, when it is forcibly rotated without a key as described above, the shear stress concentrates on the stress concentration part, so it is selected prior to other parts or selected Therefore, the stress concentration portion is broken (sheared).

  That is, the product of the shear stress and the cross-sectional area of the inner cylinder is the same in all cross sections along the rotation axis of the inner cylinder, but this stress concentration part has a significantly reduced cross-sectional area compared to the other parts. This is because the stress is remarkably increased and the shear stress reaches the shear fracture strength prior to other portions.

  Here, the shear fracture strength refers to the shear stress in the cross section of the fractured portion when the inner cylinder is sheared (ruptured).

  As described above, when the inner cylinder is sheared in the stress concentration portion, further unauthorized unlocking is impossible.

  In the longitudinal direction of the rotation axis of the inner cylinder 2 shown in FIG. 2, for example, the inner cylinder 2 is divided by a plane passing through the center of the slit 7, or the inner cylinder 2 is configured to be separated into two front and rear members by this plane. The two front and rear members are joined together by an adhesive, and this bonded portion is used as a shear fracture strength reducing portion.

  When the inner cylinder according to the embodiment of the invention described in claim 2 configured as described above is violently twisted as described above, the product of the shear stress and the cross-sectional area in each cross section of the inner cylinder is equal. Also, since the cross-sectional area does not change significantly, stress concentration does not occur.

  However, since the shear fracture strength at the bonded portion is significantly smaller than the other portions, the shear fracture occurs first or selectively at this bonded portion, and the internal portion at this bonded portion (the reduced shear fracture strength portion). As described above, when the tube is sheared, further unauthorized unlocking is impossible.

  Although the cylinder lock in the first and second embodiments is a pin cylinder lock, it is needless to say that the present invention can also be applied to a so-called disc tumbler lock described in Patent Document 2.

The longitudinal cross-sectional view of a pin cylinder lock. The top view of the key. The top view of the inner cylinder of the pin cylinder lock to which this invention is applied. The front view of a pin cylinder lock.

Explanation of symbols

1 Outer cylinder 2 Inner cylinder 3 Joint key 4 Tumbler pin 5 Driver pin 6 Shear line 7 Slit

Claims (4)

  It has an inner cylinder and an outer cylinder, and when locking, the tumbler is straddled across the shear line which is the fitting part of these inner cylinder and outer cylinder, and stress is applied to at least one place along the axis of the inner cylinder. Cylinder lock characterized by forming a concentrated portion. It has an inner cylinder and an outer cylinder, and when locked, the tumbler straddles the shear line that is the fitting part of these inner cylinder and outer cylinder. At least one location along the axis of the inner cylinder is sheared A cylinder lock characterized by forming a reduced breaking strength portion. The cylinder lock according to claim 1 or 2, wherein the tumbler is a pin tumbler. The cylinder lock according to claim 1 or 2, wherein the tumbler is a disc tumbler.

Images