JP2008121202A - Key for cylinder lock - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a key capable of being used not only as a duplicate key but also as a conversion key. <P>SOLUTION: A conversion tip, which has such a cross-sectional shape as to be capable of passing through a keyhole, is integrally and detachably attached to a leading end of the duplicate key. Thus, an engaging protrusion 3, in which a constriction is formed, is protrusively provided at the leading end of the duplicate key 1 so that the one duplicate key can be used not only for ordinary locking/unlocking but also as the conversion key for replacing a cylinder or changing key differences. A notch 4, which is to be shape-engaged with the engaging protrusion, is formed in the conversion tip 2. The engaging protrusion and the notch are fitted together, so that the conversion tip can be detachably attached to the leading end of the duplicate key. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a novel cylinder lock key (hereinafter simply referred to as a key), and in particular, a conversion key that has a simple structure and allows one key to be used as a combined key, or to exchange cylinders or change key differences. It relates to a key that can also be used.

  The present applicant has proposed a detachable cylinder lock capable of exchanging the cylinder of the cylinder lock using a conversion key in which only the distal end portion of the combined key is lengthened using Patent Document 1 described later.

  Here, the combined key is not a so-called spare key, but a key having a regular keyway that can unlock the cylinder lock.

In addition, the present applicant has proposed a novel variable lever tumbler lock that can change the key difference without changing the cylinder by using a conversion key having a long only tip part of the combined key by using Patent Document 2 described later.
Japanese Examined Patent Publication No. 06-074684 Japanese Patent Application No. 2004-312598

  The inventions described in Patent Documents 1 and 2 are not directly related to the invention of the present application and will not be described in detail. However, both use a conversion key in which only the tip of the combined key is lengthened, and a predetermined value during conversion work is used. In this process, the clutch behind the inner cylinder of the cylinder lock is pushed by the tip of the conversion key, and the key difference is changed without changing the cylinder or changing the cylinder.

  This means that a single key and a conversion key must be prepared for one cylinder, which not only wastes materials, but also makes it difficult to manage them.

  Therefore, the present invention provides a key that can be used as a combined key or a conversion key, and an object thereof is to eliminate the above-described disadvantages.

  In order to achieve the above object, the invention described in claim 1 is characterized in that a conversion chip having a cross-sectional shape capable of passing through the key hole is integrally and detachably attached to the end of the key.

  According to the second aspect of the present invention, an engagement protrusion having a constriction formed at the tip of the key is protruded. On the other hand, a notch that engages with the engagement protrusion is formed on the conversion tip. In addition, the conversion chip is detachably attached to the end of the key by fitting the notch and the notch.

  The key according to the first and second aspects of the present invention configured as described above can be used as a key if a conversion chip is not attached to the tip of the key, and can be used as a conversion key if a conversion chip is attached. It has the expected effect of being able to.

  Therefore, it is possible to replace a conversion key that is used less frequently with a small conversion chip, which saves materials, and since the conversion chip can be used for other combined keys, its management is also easy, etc. There are various effects.

  With a simple configuration in which a conversion tip is detachably attached to the tip of the key, there is no need to manufacture a conversion key, and a cylinder lock that uses a conversion key and a cylinder lock that does not need to be replaced. In addition, management of a new variable lever tumbler lock that can change the key difference was made easier.

Embodiments of the present invention will be described below with reference to the drawings.
In FIG. 1, reference numeral 1 denotes a combined key. The tip of the combined key 1 is slightly extended, and a conversion chip 2 is detachably and integrally attached to the extended portion.

  The outer shape of the conventional key is a chevron whose right end is lateral, but in the illustrated embodiment, the engagement protrusion 3 is formed integrally with a constriction (constriction) further to the right of the chevron.

  On the other hand, the conversion chip 2 is formed with a notch 4 that is in shape engagement with the engagement protrusion 3.

  Then, as shown in FIG. 1, the engaging protrusion 3 and the notch 4 are engaged with each other in shape, in other words, by fitting together without gaps, the conversion chip 2 is integrally attached to and detached from the tip of the key 1. Install as possible.

  Since the conversion tip 2 and the engagement protrusion 3 are inserted into the key hole 6 of the cylinder lock 5 shown in FIG. 2, their cross-sectional shape is at least an opening viewed from the front of the key hole 6. Set smaller than the shape.

  In the illustrated embodiment, for example, the cross-sectional shapes of the conversion tip 2 and the engagement protrusion 3 are set to be the same as that of the keyhole 6 (not shown), but if the cross-sectional shape can pass through the keyhole 6, Other shapes may be used.

  Moreover, the trapezoidal overlap drawn on the both side edges of the main body portion (the straight portion inserted into the keyhole) of the key 1 in FIG. 1 indicates the formation position and depth of the keyway.

  The key according to one embodiment of the present invention configured as described above is locked and unlocked in a state where the tip conversion tip is removed in normal use.

  At this time, the tip of the key 1 is longer than the normal one by the length of the engagement protrusion 3, but if the length is set so that the engagement protrusion 3 does not reach the clutch at the back of the cylinder, there is a problem. There is no.

  For example, to change the key difference in the variable lever tumbler lock described in Patent Document 2, a key corresponding to the key difference before the change, a conversion key corresponding to this key, a conversion key corresponding to the key after conversion, In addition, a total of four keys are necessary for the combined key after conversion.

  Moreover, despite the fact that the two conversion keys have a more complicated structure than the combined key, they are used only for changing the key difference, which is not only troublesome to manage and store, but also wastes materials. However, according to the present invention, the key difference can be changed if there is one conversion chip attached to and detached from these combined keys in addition to the combined keys before and after the change, which are appropriate members.

  In the above-described embodiment, the engagement protrusion 3 and the conversion tip are fitted together, but the notch 4 of the conversion tip 2 is made slightly smaller than that of the engagement protrusion 3, and the two are fitted. Is a so-called interference fit, the conversion chip 2 can be securely attached to the tip of the key.

The top view of the key by one Example of this invention. The front view of a cylinder lock.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Combined key 2 Conversion tip 3 Engagement protrusion 4 Notch 5 Cylinder lock 6 Key hole

Claims (2)

  A cylinder lock key characterized in that a tip for conversion having a cross-sectional shape that can pass through a key hole is integrally and detachably attached to the tip of the key.   An engagement projection having a constriction formed at the tip of the key is protruded. On the other hand, a notch that is engaged with the engagement protrusion is formed on the conversion tip, and the engagement protrusion and the notch are fitted to each other. A cylinder lock key characterized in that a conversion chip is detachably attached to the key.

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