JP2005133486A - Cylinder lock - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cylinder lock that maintains highly reliable operability for a long time. <P>SOLUTION: This cylinder lock is made by rotatably inserting into a cylinder case 6 the plug 5 that holds within a tumbler inserting hole 4 the pin-shaped tumblers 3 that advance to and retreat from the side face of an unlocking key 2 is inserted into a key inserting groove 1. A recess 7 recessed from a general face of the key inserting groove 1 is provided on an open end of the side of the key inserting groove 1 of the tumbler inserting hole 4. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a cylinder lock.

  As a cylinder lock using a pin-shaped tumbler, for example, the one described in Patent Document 1 is known. In this conventional example, the plug inserted into the cylinder case is provided with a tumbler insertion hole opened toward the key insertion groove. A pin-shaped tumbler is inserted into each tumbler insertion hole while being urged in the direction of protruding from the key insertion groove by a driver pin on the cylinder case side.

Since the rattling between the tumbler insertion hole and the tumbler is linked to the ease of picking or the like, the clearance between the tumbler insertion hole and the tumbler is set as small as possible.
Japanese Patent No. 3101678

  However, in the above-described conventional example, if the clearance with the tumbler insertion hole is reduced in order to prevent the tumbler from rattling, the following problems are likely to occur. That is, when the unlocking key is obliquely inserted into the key insertion groove, the opening end surface on the key insertion groove side of the tumbler insertion hole is rubbed by the unlocking key. FIG. 3 shows a case where the unlocking key 2 is obliquely inserted in the thickness direction in the cylinder lock in which the tumbler 3 protrudes toward the side surface of the unlocking key 2. The rubbing position by the unlocking key 2 is shown in FIG. This is indicated by point A in a).

If the rubbing frequency or rubbing force by the unlocking key 2 is increased, the shape of the opening end may eventually be deformed, and the protrusion of the tumbler 3 may be hindered.
If the protruding operation of the tumbler 3 is not guaranteed, as shown in FIG. 3B, even if the genuine unlocking key 2 is inserted, the tumbler 3 is inserted into the unlocking code forming recess 2a of the unlocking key 2. It cannot follow and protrude, and the boundary with the driver pin 9 cannot move to the boundary between the plug 5 and the cylinder case 6. As a result, the rotation operation to the plug 5 becomes impossible without opening the rotation boundary surface between the plug 5 and the cylinder case 6.

  The present invention has been made to solve the above-described drawbacks, and an object of the present invention is to provide a cylinder lock capable of improving operational reliability over a long period of time.

According to the present invention, the object is
This is a cylinder lock in which a plug 5 holding a pin-shaped tumbler 3 that advances and retreats toward the side of the unlocking key 2 inserted in the key insertion groove 1 is rotatably inserted into the cylinder case 6. And
This is achieved by providing a cylinder lock provided with a recess 7 recessed from the general surface of the key insertion groove 1 at the opening end of the tumbler insertion hole 4 on the key insertion groove 1 side.

  In the present invention, when the unlocking key 2 is obliquely inserted into the key insertion groove 1, the key insertion groove 1 is rubbed by the unlocking key 2, but the exit portion of the tumbler insertion hole 4 is one step lower than the general surface of the key insertion groove 1. Since the recess 7 is formed, the unlocking key 2 does not hit the outlet. As a result, the deformation of the outlet is reliably prevented even after long-term use, and no malfunction occurs.

  The concave portion 7 can be formed independently for each tumbler insertion hole 4, but can be formed continuously in the longitudinal direction of the plug 5 including the openings of the plurality of tumbler insertion holes 4. In this case, the general surface of the key insertion groove 1 is left around the recess 7 to serve as a guide surface for the unlocking key 2, thereby preventing the unlocking key 2 from rattling and improving operational reliability. To do.

  The concave portion 7 can be formed by a cutting tool 10 such as an end mill capable of undercut processing. In this case, if the tool introduction portion 8 is extended to the concave portion 7, the blade diameter becomes the concave portion 7. The tool introduction portion 8 is cut by the cutting tool 10 corresponding to the groove width of the formation location (in this specification, for convenience, the dimension corresponding to the plate thickness direction of the unlocking key 2 of the key insertion groove 1 is the groove width dimension). Since the processing is completed simply by cutting in the order of the recesses 7, workability is improved.

  In the present invention, even if the unlocking key 2 is inserted obliquely, the outlet portion of the tumbler insertion hole 4 is not deformed, and therefore the malfunction of the tumbler 3 due to the deformation does not occur. As a result, operational reliability can be improved over a long period of time.

  As shown in FIG. 1, the cylinder lock is formed by inserting a plug 5 into a cylinder case 6 so as to be rotatable. The plug 5 is formed with a slit-like key insertion groove 1 opened in the radial direction and at the front end of the head 5a. The key insertion groove 1 is formed with a groove width dimension (W) slightly larger than the dimension in the thickness direction of the unlocking key 2 so that the unlocking key 2 is inserted without rattling.

  The plug 5 has a plurality of circular tumbler insertion holes 4 with one opening end facing the key insertion groove 1 and the other end opened to the outer periphery at a predetermined pitch in the longitudinal direction of the plug 5. A pin-shaped tumbler 3 is slidably inserted into each tumbler insertion hole 4.

  On the other hand, when the plug 5 is in the neutral rotation position shown in FIG. 1B, the driver pins 9 facing the tumblers 3 are arranged in the cylinder case 6 so as to be movable in the same direction as the movement direction of the tumblers 3. . Each driver pin 9 is urged toward the rotation center of the plug 5 by a compression spring 9 a, and one end of the corresponding tumbler 3 protrudes into the key insertion groove 1 by the driver pin 9.

  Therefore, in this embodiment, as shown in FIG. 1 (b), when the unlocking key 2 is inserted into the key insertion groove 1, the unlocking cord forming recess 2a formed on the side wall of the unlocking key 2 is tumbled. If 3 corresponds, the boundary between the tumbler 3 and the driver pin 9 is located at the rotation boundary surface of the plug 5 with respect to the cylinder case 6, and the plug 5 can be rotated. On the other hand, when the tumbler 3 does not correspond to the unlocking cord forming recess 2a on the unlocking key 2 side, the boundary between the tumbler 3 and the driver pin 9 moves to the plug 5 side or the cylinder case 6 side. In addition, the rotation boundary surface is closed, and the rotation operation to the plug 5 is prohibited.

  In order to prevent problems due to the diagonal insertion of the unlocking key 2 into the key insertion groove 1 in the thickness direction, a recess 7 is formed in the key insertion groove 1. In this embodiment, the recess 7 has a shank diameter (Ds) smaller than the groove width dimension (W) of the key insertion groove 1 and a blade diameter (De) as shown in FIG. It is processed using a cutting tool 10 such as an end mill capable of undercutting a diameter larger than the shank diameter (Ds). In the machining by the cutting tool 10, first, cutting is started in the direction perpendicular to the rotation center line of the plug 5 from the radial opening of the key insertion groove 1, and then the cutting tool 10 is moved in the longitudinal direction of the plug 5. Done.

  By performing the above processing, the key insertion groove 1 is expanded in a predetermined length along the longitudinal direction of the plug 5 so that the key insertion groove 1 includes all of the tumbler insertion holes 4. A recess 7 is formed, and the recess 7 communicates with the outside of the plug 5 via a tool introduction portion 8 at the start of machining of the cutting tool 10.

  The recess 7 is formed so as to completely include the outlet of the tumbler insertion hole 4 to the key insertion groove 1 and leave the general surface of the key insertion groove 1 as much as possible. This unprocessed general surface functions as a guide that regulates shakiness in the thickness direction of the unlocking key 2 when the unlocking key 2 is inserted, as indicated by a chain line in FIG. .

  In the embodiment described above, the tool introduction part 8 is formed in order to use a tool whose blade diameter (De) matches the groove width dimension (W7) of the recess 7 in consideration of workability. However, by using a tool whose blade diameter (De) is smaller than the groove width (W) of the key insertion groove 1, the recess 7 can be processed without forming the tool introduction portion 8. It is.

It is a figure which shows this invention, (a) is sectional drawing, (b) is 2B-2B sectional view taken on the line of the state which inserted the key of (a). It is sectional drawing of a plug, (a) is the 1A-1A sectional view taken on the line of Fig.1 (a), (b) is the 2B-2B sectional view taken on the line of Fig.1 (a). It is a figure which shows the problem of a prior art example, (a) is sectional drawing which shows the state which inserted the unlocking key diagonally, (b) is the 3B-3B sectional view taken on the line of (a).

Explanation of symbols

1 Key insertion groove 2 Unlock key 3 Tumbler 4 Tumbler insertion hole 5 Plug 6 Cylinder case 7 Recessed portion 8 Tool introduction part

Claims (3)

A cylinder lock in which a plug holding a pin-shaped tumbler that advances and retreats toward the side of the unlocking key inserted in the key insertion groove is rotatably inserted into the cylinder case,
A cylinder lock in which a recess recessed from a general surface of the key insertion groove is provided at an opening end of the tumbler insertion hole on the key insertion groove side.   The recess includes a plurality of tumbler insertion holes and is continuously formed in the longitudinal direction of the plug. The general surface of the key insertion groove is left around the recess to serve as a guide surface for the unlocking key. The cylinder lock according to claim 1. 3. A tool introducing portion extending in the direction perpendicular to the rotation center line of the plug is extended in the recess, having the same depth as the recess, and terminating in the radial opening end of the key insertion groove. Cylinder lock as described.

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