JP4084031B2 - Cylinder lock shutter mechanism - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a shutter mechanism provided in an inner cylinder of a cylinder lock, and as an optimum application example, a rotary disc tumbler lock previously proposed by the present applicant, and more particularly to a shutter mechanism that makes picking extremely difficult.
[0002]
[Prior art]
The present applicant has previously proposed a novel rotary disk tumbler lock improved from the so-called lever tumbler lock (rotary disk cylinder lock) according to Japanese Patent Application No. 2001-316885.
[0003]
The rotary disk tumbler lock includes an outer cylinder having a cam groove formed along a generatrix of the inner peripheral surface, and a plurality of partition plates that are rotatably fitted to the outer cylinder and stacked in the central axis direction through a gap. An inner cylinder having a key hole extending along the central axis, and extending along a generatrix of the inner cylinder, and guided in a radially movable manner on the outer periphery of the inner cylinder, and the cam A locking bar biased in a direction in which an outer edge engaged with the groove protrudes outward, and a key insertion hole of a size capable of enclosing the key hole in a central portion in each slot between the partition plates Insert the formed annular rotary disk tumbler and pivotally support one part of its substantial part on a support shaft that penetrates the inner cylinder in the axial direction and unlocks the notch on the outer edge of the free end. On the other hand, the movement trajectory of the tip is at the opening edge of the key insertion hole. Engagement protrusions that interfere with the flat part or edge part of the keyed blade inserted into the hole are integrally projected, and each rotary disk tumbler is urged in the direction in which the engagement protrusions are close to the keyed key, and in a normal state. Then, when the inner cylinder is locked to the backup pin penetrating in the axial direction, on the other hand, when each of the engaging projections of these tumbler groups is engaged with the corresponding recess formed in the keyed blade inserted through the key hole. The unlocking notch of each rotary disk tumbler is aligned with the inner edge of the locking bar.
[0004]
To further summarize the structure of the rotary disk tumbler lock described above, as shown in FIG. 1, an annular rotary disk tumbler 2 having a key insertion hole 1 of a size capable of enclosing the key hole at the center is provided on the support shaft 3. The unlocking notch 4 is formed on the outer end edge of the free end portion while being pivotably supported, and on the other hand, a joint key 6 in which the movement locus of the tip is inserted into the key hole 5 at the opening edge of the key insertion hole 1. Engaging projections 7 that interfere with the flat portion or the edge of the blade of the blade are integrally projected, and each rotary disk tumbler 2 is urged in the direction in which the engaging projections 7 approach the joint key 6 and is normally backed up. When each of the engaging protrusions of the tumbler group is engaged with the corresponding recess 9 formed in the blade of the key 6 inserted through the key hole 5, each of the rotary disk tumblers is locked. Unlock notch 4 It is intended to match with the inner edge of the king bar 11.
[0005]
[Problems to be solved by the invention]
The present invention is not intended to improve the novel rotary disk tumbler lock having the above-described configuration, and by adding a novel shutter mechanism to this, picking becomes more difficult, and the safety of the rotary disk tumbler lock as a lock is improved. It aims at further improving.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the present invention includes an outer cylinder in which a cam groove is formed along a generatrix of an inner peripheral surface, and is rotatably fitted to the outer cylinder and stacked in the central axis direction through a gap. In addition to providing a plurality of partition plates, the inner cylinder extends through the key line along the central axis and the generatrix of the inner cylinder, and is guided to be movable in the radial direction at the outer periphery of the inner cylinder. And a locking bar urged in a direction in which an outer edge engaged with the cam groove protrudes outward, and a tumbler group pivotally supported by a support shaft that penetrates the inner cylinder in the axial direction. The tumbler is accommodated in each slot between the partition plates, and an unlocking notch is formed on the outer edge of the free end portion of the tumbler. On the other hand, each tumbler interferes with a keyed blade inserted in the key hole. Engagement protrusions that project are integrated, and each tumbler is connected to this engagement protrusion. Energizes in the direction close to the key, and normally locks the inner cylinder to the backup pin that penetrates the inner cylinder in the axial direction.On the other hand, when the key is inserted into the key hole of the inner cylinder, the unlocking notch of each tumbler locks In the cylinder lock that is aligned with the inner edge of the bar, the upper end edge of the partition plate that houses the locking bar spring that urges the locking bar outward from the inner cylinder fits into the key hole with a width larger than that of the joint key blade. A guide slit is formed, and a relief groove is formed in the guide slit to avoid interference with the tumbler spindle, and the lower end of the relief groove is expanded into a square shape to form a pair of arc-shaped slides. A plate-like shutter with a contact edge is stored so that it can be moved in the vertical direction, and the normal position of the sliding contact edge is inserted into the key hole during locking and unlocking operations in a normal state where the key is not inserted into the key hole. Ahead of the combined key There characterized by being configured to allow entry.
[0007]
【Example】
Embodiments of the present invention will be described below with reference to FIGS.
As shown in FIG. 2, in the rotary disk tumbler lock and the lever tumbler lock, the locking bar 11 is urged downward, that is, outward by the locking bar spring 12.
[0008]
The locking bar spring 12 at the back (left side in FIG. 2) is accommodated in an unnumbered spring hole that penetrates the tail plug 13 in the radial direction and contacts the backup pin 8.
[0009]
On the other hand, the outer locking bar spring 12 is slightly thicker than the other locking bar springs 12 and penetrates the partition plate 14, which is usually referred to as a partition plate B, from the lower side in the radial direction to the spring pin 15 (see FIG. 3). ).
[0010]
In the present invention, in order to improve picking resistance, a shutter is incorporated in the partition plate 14, and in a normal state where a key is not inserted into the key hole, the shutter is lowered downward by gravity to close the key hole. ing.
[0011]
Therefore, as shown in FIGS. 2 and 3, a guide slit 16 that fits into the key hole 5 is formed at the upper edge of the partition plate 14 with a width larger than the key hole, and the guide slit 16 is shown in FIG. The plate-like shutter 17 having such a shape is guided and stored so as to be movable in the vertical direction.
[0012]
The shutter 17 is formed with a relief groove 18 for avoiding interference with the tumbler support shaft 3 at the center in the left-right direction of FIG. A pair of arcuate sliding contact edges 19, 19 are formed.
[0013]
The shutter 17 is preferably not formed by pressing, but a hatched portion of the slidable contact edge 19 after pressing is formed into a circular arc shape by pressing.
[0014]
Further, the vertical position of the sliding contact edge 19 in the normal state where the key is not inserted into the key hole is such that the tip (right end) of the blade of the key 6 (see FIGS. 6 and 7) slides as shown in FIG. It is set so that it can enter below the contact edge.
[0015]
The position of the sliding contact edge 19 may be set by bringing the lower end of the shutter 17 into contact with the lower end of the guide slit 16, or the upper end of the escape groove 18 (see FIG. 5) is the support shaft. The position may be set when engaged with 3.
[0016]
As shown in FIG. 8, the shutter mechanism according to the embodiment of the present invention configured as described above normally has a part of the shutter 17 viewed from the keyhole 5, but most of the rotary disk is in front of the shutter. Hidden after tumblers 2 and 2.
[0017]
The reason why the rotary disk tumbler 2 can be seen on the left and right sides of the keyhole 5 is that the rotary disk tumblers 2 and 2 adjacent to each other in the axial direction of the inner cylinder have the engagement protrusions 7 shown in FIG. This is because the urging direction of the rotary disc tumbler is designed to be alternately opposite to each other.
[0018]
In a normal locking / unlocking operation, the joint key 6 is inserted into the key hole. Therefore, the tip of the key 6 is inserted into the key hole while pushing up the engaging protrusions 7, 7 of the rotary disk tumbler in front of the shutter 17. As a result, the leading end of the key enters the lower side of the sliding contact edges 19, 19, and the entire shutter 17 is pushed upward by the wedge action generated between these and the chamfered portion of the key leading end.
[0019]
When the key is removed from the keyhole after the locking / unlocking operation, the shutter 17 falls downward due to gravity and returns to the original position shown in FIG.
[0020]
Therefore, the presence of the shutter 17 does not cause any obstacle in a normal locking / unlocking operation, but in the case of picking, the shutter 17 interferes with the operation.
[0021]
That is, for picking, a thin tool is inserted into the keyhole 5 and the engagement protrusion 7 of the target rotary disc tumbler is pushed up by this tool and torque is applied to the inner cylinder to align the locking bar 11 and the unlocking notch 4. Detection is made based on a delicate touch, and the angular position of the rotary disk tumbler is locked to the locking bar 11 via frictional engagement.
[0022]
This operation is performed from the back for all the tumblers. When the innermost tumbler is operated, of course, the shutter 17 is pushed up by the tool, and the tool is inserted deeper than that.
[0023]
At this time, the operation of pushing up the shutter 17 is troublesome, and the tumbler supported by the support shaft 3 and supported so as to rotate smoothly cannot be moved.
[0024]
Even if you struggle and lock the innermost tumbler at the unlocked angle position, the next tumbler is located on the opposite side of the innermost keyhole and the cross-sectional shape of the keyhole Since the central part is complicated and thin (see FIG. 8), the tool cannot be moved from right to left at the end.
[0025]
When picking the next tumbler, it is necessary to remove the tool inserted by pushing up the shutter 17 with difficulty, for example, once from the left opening of the keyhole, and replace it with the right opening. I have to raise it.
[0026]
In the same manner, the shutter must be pushed up every time the tumbler is operated during picking, and the urgent unauthorized unlocker finally gives up and thus the shutter mechanism according to the present invention performs picking. Make it extremely difficult.
[0027]
The shutter mechanism is not limited to the illustrated rotary disk tumbler lock, but can also be applied to a conventional lever tumbler lock.
[0028]
【The invention's effect】
As is apparent from the above description, the present invention incorporates a shutter into the partition plate 14 that is relatively close to the outer end of the inner cylinder, and during picking, forcing a troublesome push-up operation of the shutter every time the tumbler is picked. Has the expected effect of making it extremely difficult.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view for explaining a configuration of a rotary disc tumbler lock.
FIG. 2 is a longitudinal sectional view for explaining the configuration of a rotary disc tumbler lock.
FIG. 3 is a front view of a shutter mechanism according to the present invention.
FIG. 4 is a plan view thereof.
FIG. 5 is a front view of a shutter.
FIG. 6 is a plan view of a joint key.
FIG. 7 is a side view of a joint key.
FIG. 8 is a front view of a rotary disc tumbler lock provided with a shutter mechanism according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Key insertion hole 2 Rotary disk tumbler 3 Spindle 4 Unlocking notch 5 Key hole 6 Key 7 Engagement protrusion 8 Backup pin 9 Depression 11 Locking bar 12 Locking bar spring 14 Partition plate 16 Guide slit 17 Shutter 18 Escape groove 19 Sliding contact Edge

Claims (1)

An outer cylinder formed with a cam groove along the generatrix of the inner peripheral surface, and a plurality of partition plates that are rotatably fitted to the outer cylinder and stacked in the central axis direction through a gap are provided. And an outer edge that extends along the generatrix of the inner cylinder and is guided so as to be movable in the radial direction at the outer peripheral portion of the inner cylinder and engages with the cam groove And a tumbler group pivotally supported by a support shaft penetrating the inner cylinder in the axial direction, and each slot between the partition plates has a tumbler. And an unlocking notch is formed on the outer edge of the free end portion of the tumbler.On the other hand, each tumbler is integrally provided with an engaging protrusion that interferes with the keyed blade inserted in the key hole. While urging the tumbler in the direction in which this engaging projection approaches the key, In this state, the inner cylinder is locked to the backup pin penetrating in the axial direction. On the other hand, when the key is inserted into the key hole of the inner cylinder, the unlocking notch of each tumbler is aligned with the inner edge of the locking bar. In the lock, a guide slit is formed at the upper edge of the partition plate that houses the locking bar spring that urges the locking bar outwardly from the inner cylinder, and has a width larger than the blade of the key and fits into the key hole. A plate-shaped shutter is formed with a relief groove to avoid interference with the tumbler spindle and a pair of arc-shaped sliding contact edges formed by expanding the lower end of the relief groove into a rectangular shape. In the normal state where the key is not inserted into the key hole, the vertical position of the sliding contact edge is set so that the tip of the key inserted into the key hole can enter during locking / unlocking operation. Characterized by Cylinder lock of the shutter mechanism.

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