JP3435138B2 - Pin tumbler tablets - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pin tumbler lock used for vending machines, automobiles, buildings, and the like. 2. Description of the Related Art In a pin tumbler lock, a rotor is rotatably housed in a fixed body, and a drive pin and a driven pin are housed in a drive pin receiving hole of the fixed body and a driven pin receiving hole of the rotor. The drive pin is urged in the direction of the rotor by a spring, and in a locked state in which the key is removed from the key hole of the rotor, the tip of the drive pin is engaged with the driven pin receiving hole, whereby the rotor is moved relative to the fixed body. It is restrained from rotating. [0003] Recently, in homes, vending machines, and the like, the pin tumbler locks are frequently broken open by picking tools. The picking tool is a wire-like or thin strip-shaped member, which pushes up the tip of the driven pin protruding into the keyhole and pushes the tip of the drive pin back into the drive pin receiving hole of the fixed body. The push-up operation is repeatedly performed on a set of a plurality of pin tumblers (a driven pin and a drive pin) arranged in the front-rear direction along the keyhole while applying a rotational moment to the rotor in the unlocking direction. When the contact surface between the driven pin and the drive pin coincides with the contact surface between the fixed body and the rotor for all the pin tumbler sets, the rotation constraint of the rotor is released and the rotor is rotated in the unlocking direction. Although various protection measures have been adopted against unauthorized unlocking by such picking tools, the arrangement of tumbler tweezers is generally regular, and many arrangements are already known or are known. Because it can be inferred from the object, the skilled thief will be sooner or later detected as he repeatedly inserts and scrapes the picking equipment. As a result, the picking tool can be unlocked as it is, or the duplicate key can be copied illegally for repeated use. [0005] Accordingly, an object of the present invention is to provide a security against illegal unlocking and illegal duplication of a duplicate key by a picking tool because it is difficult to grasp the arrangement of tumbler tweezers. Is to provide a significantly improved pin tumbler tablet. The gist of the present invention is that a rotor 2 is rotatably accommodated in a fixed body 1 and a drive pin receiving hole 3 of the fixed body 1 and a driven pin receiving hole 4 of the rotor 2 are provided. Drive pin 5
The driven pin 5 is urged in the direction of the rotor 2 by the tumbler pin spring 7 and the key 9 is removed from the key hole 8 of the rotor 2 in a locked state. In a pin tumbler lock in which the rotor 2 is restrained from rotating with respect to the fixed main body 1 by engaging with the driven pin receiving hole 4, the abdominal surface 9 a of the key 9 is
S-shaped curved cross section perpendicular to the insertion direction
A wavy groove 10 meandering in the curved abdominal surface 9a along the direction of insertion into the keyhole 8 is formed at the same depth over the entire length, and a driven pin receiving hole is formed so as to face the wavy groove 10. 4 is provided on the rotor 2, and when the tip 6 a of the driven pin 6 contacts the bottom surface 10 a of the corrugated groove 10, the contact surface between the drive pin 5 and the driven pin 6 matches the contact surface between the fixed body 1 and the rotor 2. That is, the length of the driven pin 6 is set as described above. According to the present invention , a valid administrator can set an appropriate key 9
Is inserted into the key hole 8 of the rotor 2, the drive pin 5 and the driven pin 6 advance and retreat in the drive pin receiving hole 3 and the driven pin receiving hole 4, and the curved abdominal surface 9 a of the key 9 is similarly curved. Keyhole 8
In the width direction inner surface 8a. At this time, the tip portions 6a of all the driven pins 6 are
, The contact surface between the drive pin 5 and the driven pin 6 coincides with the contact surface between the fixed body 1 and the rotor 2, and the rotor 2 is rotated by the key 9 in the unlocking direction. When the tip 6a of any one driven pin 6 is not in contact with the bottom surface 10a of the corrugated groove 10, the driving pin 5 set with the driven pin 6
Of the driven pin 6 is still engaged with the driven pin receiving hole 4 or the base end of the driven pin 6 is
It means that the rotor 2 has been inserted, so that the rotation constraint of the rotor 2 with respect to the fixed body 1 has not been released yet. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the illustrated embodiment, a driving pin 5
The pin tumbler set consisting of the driven pin 6 and the driven pin 6 includes a driven pin 6 that engages with a key code portion 11 formed of an uneven portion formed on an abdominal surface 9a other than the corrugated groove 10 of the key 9 as in the related art, A driven pin 6 that engages with a key code portion 12 composed of a concave and convex portion formed on a side edge of the key 9
Are also used in combination. In these pin tumbler sets, when the key 9 is inserted into the keyhole 8,
The driven pin 6 is pushed into the driven pin receiving hole 4 by a predetermined amount corresponding to the key code portion 17, and the driving pin 5
Is pushed back to the contact surface between the fixed body 1 and the rotor 2, that is, the shear line. The tumbler pin spring 7 is constituted by a compression coil spring, and its base end is in contact with a spring receiving member 13 fixed to the fixed body 1. A stop shoulder 6b that limits the amount of protrusion of the tip 6a into the keyhole 8 is formed at the intermediate portion of the driven pin 6 . The cross-sectional shape of the key 9 is not limited to these, and can be variously changed within a range that can be processed by an NC processing machine numerically controlled by a computer. Instead of using the conventional key code portions 11 and 12 together, the waveform groove 10 alone may be used alone as the key code portion. As described above, according to the present invention, the abdominal surface of the key 9
9a is an S-shaped cross section perpendicular to the direction of insertion into the keyhole 8.
It is formed in a curved shape, and extends along the insertion direction into the keyhole 8.
A meandering wavy groove 10 is formed in the abdominal surface 9a at the same depth over the entire length, and a driven pin receiving hole 4 is provided in the rotor 2 so as to face the wavy groove 10 . The length of the driven pin 6 was set such that the contact surface between the drive pin 5 and the driven pin 6 coincided with the contact surface between the fixed body 1 and the rotor 2 when the tip 6a came into contact with the bottom surface 10a of the corrugated groove 10. Therefore, it is extremely difficult for a thief who has arranged the conventional pin tumbler arrangement to detect or guess the arrangement form of the pin tumbler of the present invention, and assumes that the conventional pin tumbler arrangement is used. Unable to unlock with a picking tool. Further, since the arrangement of the driven pin 6 and the length of the keyhole 8 cannot be known, the duplicate key cannot be illegally copied, and the security is greatly improved. In the present invention , the cross section is formed in an S-shape.
A wavy groove 10 is formed on the abdominal surface 9a of the key 9
However, in order to cut the wavy groove 10 on the curved surface in this way, a high-performance machine tool numerically controlled by a computer is necessary, and this cannot be obtained and used by an ordinary thief. Unauthorized duplication of the key 9 is almost impossible, and security is greatly improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view of a pin tumbler lock according to an embodiment of the present invention, showing a locked state. FIG. 2 is a right side view of the pin tumbler lock of FIG. 1. FIG. 3 is a right side view of a key inserted into the pin tumbler lock of FIG. 1; FIG. 4 is a left side view of the key in FIG. 3; FIG. 5 is a front view of the key of FIG. 3; FIG. 6 is a sectional view taken along line AA of FIG. 3; FIG. 7 is a sectional view taken along the line BB of FIG. 2; FIG. 8 is a right side view of a key according to another embodiment of the present invention. FIG. 9 is a sectional view taken along the line CC of FIG. 8; FIG. 10 is a sectional view taken along line DD of FIG. 8; [Description of Signs] 1 Fixed body 2 Rotor 3 Drive pin receiving hole 4 Follower pin receiving hole 5 Drive pin 6 Follower pin 7 Spring for tumbler pin 8 Key hole 9 Key 10 Waveform groove 11 Key code part 12 Key code part

────────────────────────────────────────────────── (5) References JP-A-56-85074 (JP, A) JP-A-55-32897 (JP, A) JP-A-50-141498 (JP, A) JP-A 2002-115426 (JP, A) JP-A-9-144398 (JP, A) JP-A 50-18690 (JP, U) JP-A 57-204362 (JP, U) JP-B 43-8438 (JP, B1) No. 35-23291 (JP, Y1) (58) Fields investigated (Int. Cl. ⁷ , DB name) E05B 19/02-19/08 E05B 15/00 E05B 27/10

Claims (1)

(1) A rotor is rotatably housed in a fixed body, and a drive pin is formed in a drive pin receiving hole of the fixed body and a driven pin receiving hole of the rotor. The driven pin 6 is housed in the locked state in which the driven pin 5 is biased toward the rotor 2 by the tumbler pin spring 7 and the key 9 is removed from the key hole 8 of the rotor 2. by engaging with the driven pin receiving hole 4, the cylinder lock to nonrotatably constraining the rotor 2 with respect to the fixed body 1, the key 9
Of the abdominal surface 9a is perpendicular to the direction of insertion into the keyhole 8.
A wavy groove 10 meandering along the direction of insertion into the keyhole 8 is formed in the curved abdominal surface 9a at the same depth over the entire length, and faces the wavy groove 10. When the driven pin receiving hole 4 is provided in the rotor 2 and the tip 6a of the driven pin 6 contacts the bottom surface 10a of the corrugated groove 10, the contact surface between the driving pin 5 and the driven pin 6 is fixed to the fixed body 1 and the rotor 2 as shown in FIG. A pin tumbler lock, wherein the length of the driven pin 6 is set so as to match the contact surface of the pin tumbler.