JP4368754B2 - Cylinder lock - Google Patents

Description

  The present invention relates to a cylinder lock.

As a cylinder lock having a plug with a cap member attached to the front end, one described in Patent Document 1 is known. In this conventional example, a key guide (cap member) attached to the tip of the plug is formed with a key insertion opening for guiding an unlocking key to a key insertion groove in the plug. The key insertion opening is formed in a cross-sectional shape that is substantially the same as the cross-sectional shape of the unlocking key in order to determine the correctness of the unlocking key by the cross-sectional shape. Protrusions that can be fitted into guide grooves formed on the side surfaces are provided so as to project over the entire length in the depth direction.
JP 58-11272 A

  In the conventional example described above, as shown in FIG. 4B, even when the unlocking key 4 is inserted obliquely with respect to the key insertion direction line of the key insertion opening 10, as shown in FIG. Since the lock key 4 is guided to the normal insertion posture, the locking / unlocking operation is not hindered.

  However, when the unlocking key 4 is inserted diagonally, the protrusion 7 comes into contact with the wall surface of the guide groove 4 a of the unlocking key 4, so that when the hardness of the unlocking key 4 is higher than the protrusion 7. The protrusion 7 is worn by long-term use. The wear of the protrusion 7 facilitates the insertion of a foreign object such as a driver into the plug 2, thus causing a problem that an unauthorized unlocking operation is facilitated.

  On the other hand, for example, when the cap member 3 is attached to the plug 2 by a drill or the like to prevent destruction work, the cap member 3 is formed of a hard material, and therefore, due to wear of the wall surface of the guide groove 4a. Deformation occurs. When the guide groove 4a is deformed, in the cylinder lock of the specification in which the mounting posture of the unlocking key 4 in the plug 2 is regulated by the guide projection protruding in the plug 2, the unlocking in the plug 2 is performed. Since it becomes difficult to maintain the posture of the key 4, the contact state with the tumbler is not constant, causing a problem that the locking / unlocking operation is hindered.

  In addition, in the unlocking key 4 in which the cord forming recess 4c is disposed in the vicinity of the guide groove 4a, the cord forming recess 4c is deformed as the guide groove 4a is deformed. As a result, it becomes impossible to drive the tumbler to the proper position and the locking / unlocking operation cannot be performed. FIG. 4D shows this state, and the area where the side surface of the unlocking key 4 is shaved is shown by hatching.

  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
A cylinder lock in which a front end of a plug 2 inserted into a cylinder case 1 so as to be rotatable is covered with a cap member 3,
The cap member 3 is provided with a blade guide opening 6 having a cross-sectional shape that substantially matches the cross-sectional shape of the unlocking key 4 and guiding the inserted unlocking key 4 to the key insertion groove 5 of the plug 2.
In addition, the blade guide opening 6 extends rearward from the front end of the blade guide opening 6 at a position that is appropriately spaced from the front end and extends rearward, and is fitted in a guide groove 4 a formed on the side wall of the unlocking key 4. This is achieved by providing a cylinder lock in which the possible protrusion 7 is provided.

  The front end of the plug 2 is covered with a cap member 3 for the purpose of preventing an illegal destruction operation using a drill to the plug 2, for example, and the unlocking key 4 is inserted into the key insertion groove of the plug 2 on the cap member 3. A blade guide opening 6 for being inserted into 5 is opened. The cap member 3 can be directly connected to the plug 2 or can be held by the cylinder case 1. When the cap member 3 is held by the cylinder case 1, the cap member 3 is free to rotate with respect to the cylinder case 1 and the plug 2. The blade guide opening 6 is aligned with the key insertion groove 5 of the plug 2 by being connected in the rotational direction.

  The blade guide opening 6 is formed in a cross-sectional shape that substantially matches the cross-sectional shape of the unlocking key 4 so that the posture of the inserted unlocking key 4 can be corrected and guided to the key insertion groove 5 of the plug 2. Is done.

  In the present invention, an unlocking key inserted obliquely by providing a protrusion 7 in a rear region within the blade guide opening 6 having a guide function itself and appropriately spaced from the front end of the blade guide opening 6. 4 can be shared by the wall surface of the blade guide opening 6 and the protrusion 7. As a result, since the protrusion 7 functions as a guide from the beginning of the oblique insertion of the unlocking key 4, the burden on the protrusion 7 is reduced in the present invention compared to the conventional example that is exposed to scratching. 7 or the deformation of the guide groove 4a of the unlocking key 4 is reduced.

  The blade guide opening 6 can be formed in the entire area of the key insertion opening 10 for inserting the unlocking key 4 established in the cap member 3, but a stopper step formed in the unlocking key 4. It is possible to form a blade base end fitting opening 9 into which the blade base end portion of the unlocking key 4 is fitted in the front region with the key stopper 8 contacting the 4b as a boundary.

As described above, by providing the protrusion 7 at a deep position in the blade guide opening 6, the correction of the acute oblique insertion posture is left to the action of the wall surface of the blade guide opening 6. The problem due to the acute sliding contact between the protrusion 7 and the guide groove 4a is solved, but as shown in FIG.
When the protrusion 7 constitutes a cylinder lock provided in a non-contact region with the guide groove 4a of the unlocking key 4 in an oblique insertion posture whose tip is in contact with the narrow surface of the blade guide opening 6, Since the protrusion 7 is specialized in the function of fine adjustment with respect to the unlocking key 4 whose posture has been substantially corrected, it is possible to eliminate the problem caused by the rubbing of the protrusion 7.

Further, in a cylinder lock that is unlocked and operated using the unlocking key 4 provided with the unlocking cord forming recess 4c on the side surface and the cap member 3 is formed of a hard material, FIG. As shown, the side surface of the unlocking key 4 is shaved by the edge of the key insertion opening 10 as shown by hatching in FIG. 4 (f) by obliquely inserting the unlocking key 4 in the thickness direction. there is a possibility. The wear on the side surface of the unlocking key 4 causes the unlocking operation to become impossible due to wear of the unlocking cord forming recess 4c. When the front end surface of the cap member 3 has a convex spherical shape,
The front end edge of the blade base end fitting opening 9 constitutes a cylinder lock that is rounded and has a radius of curvature that is the same in the entire circumference and a center of curvature that is disposed in the same plane in the entire circumference. Is desirable. With the above configuration, even when the front end surface of the cap member 3 is a convex surface, the side surface of the unlocking key 4 uniformly hits the rounded chamfered portion, so that the side surface of the unlocking key 4 is deformed by partial pressure contact and unlocked thereby. Alteration of the cord forming recess 4c can be reliably prevented.

  According to the present invention, it is possible to effectively prevent damage due to the oblique insertion of the unlocking key 4, so that the operation reliability can be improved over a long period of time.

As shown in FIG. 1, the cylinder lock is formed by rotatably inserting a plug 2 whose front end is covered with a cap member 3 into a cylinder case 1.
The plug 2 is formed with a slit-like key insertion groove 5 that is opened in the radial direction and at the front end of the head. The key insertion groove 5 is formed to have a slightly larger groove width dimension (W) than the unlocking key 4 in the thickness direction so that the unlocking key 4 can be inserted without rattling. The plug 2 has a plurality of tumbler insertion holes 2a having a circular cross section with one opening end facing the key insertion groove 5 and the other end opened to the outer periphery at a predetermined pitch in the longitudinal direction of the plug 2. A pin-shaped tumbler 11 is slidably inserted into each tumbler insertion hole 2a.

  On the other hand, in the cylinder case 1, when the plug 2 is in the neutral rotation position, driver pins 12 that face the respective tumblers 11 are arranged so as to be movable in the same direction as the movement direction of the tumblers 11. Each driver pin 12 is urged toward the center of rotation of the plug 2 by a compression spring 13, and one end of the corresponding tumbler 11 protrudes into the key insertion groove 5 by the driver pin 12.

  Therefore, in this embodiment, when the unlocking key 4 shown in FIGS. 1B and 1C is inserted into the key insertion groove 5, the unlocking code forming recess formed on the side wall of the unlocking key 4 is formed. When the tumbler 11 corresponds to 4c, the boundary between the tumbler 11 and the driver pin 12 is located at the rotation boundary surface of the plug 2 with respect to the cylinder case 1, and the rotation operation with respect to the plug 2 becomes possible. On the other hand, when the tumbler 11 does not correspond to the unlocking cord forming recess 4c on the unlocking key 4 side, the boundary between the tumbler 11 and the driver pin 12 moves to the plug 2 side or the cylinder case 1 side. In addition, the rotation boundary surface is closed, and the rotation operation to the plug 2 is prohibited.

  The cap member 3 is formed of a hard material such as hardened steel or cemented carbide to prevent the plug 2 from being broken by a drill or the like, and is free to rotate with respect to the cylinder case 1 and cannot be detached. Connected to cover the front end of the plug 2. In order to connect the cap member 3 to the cylinder case 1 so as to be free to rotate and not to be detached, a connecting ring 14 is attached to the boundary between the cylinder case 1 and the cap member 3, and the cap member 3 is connected to the plug 2. On the other hand, a connecting pin 15 is attached to the boundary between the cylinder case 1 and the cap member 3 in order to connect in the rotational direction.

  As shown in FIG. 2, the cap member 3 is formed in a spherical surface whose front end is convex forward, and a key insertion opening 10 communicating with the key insertion groove 5 of the plug 2 is opened in the center. The key insertion opening 10 is formed in an oblong shape when viewed from the front, and the depth of insertion of the unlocking key 4 is in contact with a stopper step 4b formed at the blade base end of the unlocking key 4 in the middle in the depth direction. A key stopper 8 is provided to restrict the movement. The key insertion opening 10 includes a blade base end fitting opening 9 located on the front surface side and a blade guide opening 6 on the back side with the key stopper 8 as a boundary. The leading edge of the key, i.e., the front edge of the key insertion opening 10 is rounded over the entire circumference.

  The rounded chamfering is for preventing wear of the unlocking code forming recess 4c due to rubbing between the ridgeline of the key insertion opening 10 and the side surface of the unlocking key 4 when the unlocking key 4 is inserted while being inclined in the thickness direction. In this embodiment, which is effective and the front end is formed by a spherical surface, the chamfered area is determined as follows. That is, in the rounded chamfering in which the ridge line portion of the key insertion opening 10 opened with respect to the spherical surface is simply a curvature surface, the center portion of the cap member 3 comes first to the side surface of the unlocking key 4, so that the unlocking key 4 This will promote local wear. In order to prevent this and to eliminate a sense of discomfort in design, first, the outer peripheral shape of the key stopper 8 (A line in FIG. 2A) is determined, and then the key stopper 8 or a surface parallel to this ( 2 (d) is set as the curvature center plane (in this embodiment, the surface on which the key stopper 8 is formed is the curvature center plane). Thereafter, in the entire cross section in the direction perpendicular to the outer periphery of the key stopper 8, the center of curvature (C) is located in the center of curvature, and the same curvature (R) is in contact with the peripheral wall of the blade proximal end fitting opening 9. The ridge portion is cut by the arc.

  The chamfered area formed in this way changes so that it is wide in the center of the spherical surface and gradually narrows toward the outer periphery as shown by hatching in FIG. As a result, even when the unlocking key 4 is inserted obliquely in the thickness direction, the curvature surface by the rounded chamfering contacts the entire side surface of the unlocking key 4 evenly, so that partial concentrated contact occurs. It can be surely prevented.

  On the other hand, the blade guide opening 6 is formed in a cross-sectional shape that substantially matches the cross-sectional shape of the unlocking key 4. As a result, the degree of freedom of movement of the unlocking key 4 is smaller in the blade guide opening 6 than in the blade base end fitting opening 9, and as shown in FIG. The lock key 4 comes into contact with the narrow surface of the blade guide opening 6 and is corrected to a horizontal posture and guided to the key insertion groove 5 of the plug 2.

  Further, a protrusion 7 that can be fitted in a guide groove 4 a formed on the side surface of the unlocking key 4 is provided on the inner wall surface of the blade guide opening 6. As shown in FIG. 3 (a), the protrusion 7 is formed by inserting the unlocking key 4 obliquely in the width direction, with the front end face of the unlocking key 4 being in contact with the peripheral wall of the blade guide opening 6. Is provided at a position where it does not interfere with the guide groove 4a of the unlocking key 4.

  Therefore, in this embodiment, the unlocking key 4 inserted obliquely is first corrected in direction by contacting the narrow surface of the blade guide opening 6 and then, as shown in FIG. The insertion position is corrected by 7 and guided to the key insertion groove 5 of the plug 2.

It is a figure which shows this invention, (a) is sectional drawing, (b) is a top view which shows an unlocking key, (c) is the 1C-1C sectional view taken on the line of (b). It is a figure which shows a cap member, (a) is a front view, (b) is the 2B-2B sectional view taken on the line of (a), (c) is a rear view, (d) is the 2D-2D sectional view taken on the line of (a) It is. It is a figure which shows the effect | action of this invention, (a) is sectional drawing which shows the state which inserted the unlocking key diagonally, (b) is a cross section which shows the state which the unlocking key is finely adjusted by the protrusion and is guide | induced into a plug FIG. It is a figure which shows the problem of a prior art example, (a) is a front view of a cylinder lock, (b) is sectional drawing which shows the state which inserted the unlocking key diagonally, (c) is the unlocking key by which the posture correction was plugged Sectional drawing which shows the state introduce | transduced in the inside, (d) is a figure which shows the front-end | tip of the unlocking key by which the guide groove was shaved, (e) is a cross section which shows the state in which the unlocking key was inserted diagonally in the plate | board thickness direction FIG. 5F is a diagram showing a state where the tip of the unlocking key has been cut in the thickness direction.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cylinder case 2 Plug 3 Cap member 4 Unlocking key 4a Guide groove 4b Stopper step part 5 Key insertion groove 6 Blade guide opening part 7 Protrusion part 8 Key stopper 9 Blade base end fitting opening part

Claims (4)

A cylinder lock in which a front end of a plug inserted in a cylinder case so as to be rotatable is covered with a cap member,
The cap member has a cross-sectional shape that substantially matches the cross-sectional shape of the unlocking key, and is provided with a blade guide opening that guides the inserted unlocking key to the key insertion groove of the plug,
In addition, the blade guide opening has a protrusion that protrudes from the front end of the blade guide opening at an appropriate distance from the front end and extends rearward and can be fitted in a guide groove formed on the side wall of the unlocking key. Cylinder lock protruding. The blade guide opening is formed in the rear region with a key stopper abutting against a stopper step formed on the unlocking key as a boundary,
The cylinder lock according to claim 1, wherein a blade base end fitting opening portion into which a blade base end portion of the unlocking key is fitted is provided in a front region of the cap member communicating with the blade guide opening portion.   3. The cylinder lock according to claim 1, wherein the protrusion is provided in a non-contact region with the guide groove of the unlocking key in an oblique insertion posture in which a tip is in contact with a narrow surface of the blade guide opening. The front end surface of the cap member has a convex spherical shape,
The front end edge of the blade base end fitting opening is rounded with a radius of curvature such that the radius of curvature is the same in the entire circumference and the center of curvature is arranged in the same plane in the entire circumference. Or the cylinder lock of 3.

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