JPH01299968A - Side bar lock device - Google Patents

Abstract

PURPOSE:To prevent a side bar lock device from being improperly unlocked, by forming a projection on a side bar so that the side bar may be rotated in engagement with the locking part of the projection upon proper insertion of a key while the projection is made to abut against a tool or the like which is not proper and which is improperly inserted, so as to inhibit the rotation of the side bar. CONSTITUTION:There is provided a side bar lock device 10 composed of a casing 14, a slot 15, a key cylinder 17, tumblers 19, a side bar 21 and the like. A projection 21c formed on the side bar 21 is disposed in a bore 16 in a key cylinder 17, slidably and engageably with an abutting part formed on each tumbler 19. Further, upon insertion of a proper key, the projection 21c is engaged in an engaging part formed in the key, and accordingly, the side bar 21 comes off from an engaging hole in the casing 14 so as to rotatable. Meanwhile, if a tool such as a driver or the like is improperly inserted in a key groove 17a, the projection 21 abuts against the tool so as to inhibit the side bar 21 from rotating.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to locking devices, and more particularly to sidebar locking devices.

Since the tumbler lock was invented in 1848, various locking devices have been developed. The developed lock devices often have different key structures and shapes depending on the theft prevention method of each country.

Although a detailed explanation will be omitted, sidebar locking devices have great resistance to so-called "picking" and "breaking" and have been developed primarily in the United States.

For example, as shown in U.S. Pat. No. 3,080.744, a side bar locking device includes a case having a housing hole formed in the length direction, and a case rotatably disposed within the housing hole. It has a key cylinder. The key cylinder is provided with a plurality of radially formed slots and a hole formed substantially perpendicular to the slots. A plurality of tumblers are slidably disposed within respective slots of the key cylinder and have keyholes. A tumbler spring is disposed between each tumbler and the key cylinder and biases the tumbler toward the outside of the key cylinder. Each tumbler is provided with recesses as abutting portions at different positions relative to the keyhole.

The side bar is slidably disposed within the hole of the key cylinder and within the locking groove of the case so as to be able to engage with the abutting portion of the tumbler. The side bar is urged against the tumbler by a side spring.

In the above configuration, when the key is inserted into the side bar lock device, the tumblers are moved against the tumbler springs so that the contact portions of each tumbler are aligned in a straight line. Therefore, the ends of the side bars fit into the abutting portions of all the tumblers, and the side bars escape from the engagement grooves of the case. In this way, the side bar moves to a retracted position where it does not protrude from the key cylinder, so that the key can be rotated to unlock the door. The side bar lock device has a high mechanical strength against breakage, and it is difficult to simultaneously move all the tumblers to the predetermined positions where they engage with the side bar in the event of unauthorized unlocking. High resistance to unauthorized unlocking.

As technology advances, it is desirable for sidebar locking devices to be more resistant to unauthorized unlocking.

Therefore, it is an object of the present invention to provide a sidebar lock device that has extremely high resistance to unauthorized unlocking.

The side bar locking device according to the present invention for locking a case includes a housing hole formed in the length direction, a locking groove formed in the length direction in communication with the housing hole, and a case having a locking groove formed in the length direction. a key cylinder having a key groove formed in the radial direction, a plurality of slots formed in the radial direction, and a hole formed substantially perpendicularly to the slots, and rotatably disposed within the housing hole of the case; a plurality of tumblers slidably disposed within each slot of the key cylinder and having a key hole; and a plurality of tumblers slidably disposed within the hole of the key cylinder and having a protrusion and engaged with an abutment portion formed on each tumbler. a side spring that biases the side bar against the tumbler; and a tumbler spring that is disposed between each tumbler and the key cylinder and biases the tumbler in a direction in which the abutting portion of the tumbler is separated from the side bar. and has. When the key is not inserted into the keyway of the key cylinder.

The side bar protrudes into the locking groove of the case against the elasticity of the side spring. When the key is inserted into the keyway of the key cylinder, the side bar engages with the engaging portion of each tumbler, and the protrusion of the side bar is fitted into the opening formed in the key.

According to this invention, when a regular key is inserted into the key cylinder, the protrusion of the side bar is engaged with the locking part formed on the key. Thereby, the side bar is disengaged from the engagement hole of the case, and the key can be rotated together with the key cylinder. In this invention, the locking device can be unlocked only with a key having a locking portion formed at a predetermined position.

Further, when a tool such as a screwdriver is incorrectly inserted into the keyway, the protrusion of the sidebar comes into contact with the tool, so the sidebar does not move into the keyway. This makes unauthorized unlocking even more difficult.

Embodiments of the present invention will now be described with reference to FIGS. 1 to 12.

First, as shown in FIGS. 1 to 3 and 7, the side bar lock device 10 according to the present invention includes a case 14,
A key cylinder 17 rotatably housed within the case 14
and has. Case 14 is.

It has a housing hole 11 formed in the length direction, and a tumbler groove 12 (FIGS. 2 and 3) and a locking groove 13 that are both connected to the housing hole 11 and formed in the length direction. The key cylinder 17 has a keyway 17a formed in the length direction, a plurality of slots 15 formed in the radial direction, and a hole 16 formed substantially perpendicular to the slots 15. The key cylinder 17 is rotatably arranged within the housing hole 11 of the case 14. The plurality of tumblers 19 are disposed so as to be slidable in each slot 15 of the key cylinder 17 and protrude from the key cylinder 17 into the tumbler groove 12 of the outer case 14, and each has a key hole 18. The tumbler spring 20 connects each tumbler 19 and the key cylinder 1.
7 and the tumbler 19 is placed between the key cylinder 1 and the tumbler 19.
7 to the outside.

The side par 21 is slidably disposed within the hole 16 of the key cylinder 17 and is disposed so as to be able to engage with contact portions 25 formed as notches at different positions of each tumbler 19 . Although not shown in detail, in order to provide a key code to each tumbler 19, the abutment portion 25 is formed at a different position for each tumbler 19 with respect to the key hole 18. A lid 23 is attached to the locking groove 13 and fixed to the case 14 by caulking. The side spring 22 has spring seats 21a and 21 formed at both ends of the side par 21.
b and each spring receiving member 27 that contacts the legs 23a and 23b of the lid 23, and biases the side par 21 against the tumbler 19. As clearly shown in FIG. 7, a protrusion 21c is formed on the spring seat 21a of the side par 21. As shown in FIG. 8, the key 26 inserted into the keyway 17a of the key cylinder 17 has a key blade 26d.
It has an opening 26a as an engaging portion formed in the. Tapered surfaces 26b and 26c are formed on the inner wall of the key blade 26d forming the opening 26a. Furthermore, tapered surfaces 26a and 26f are formed at the tip of the key blade 26d.

In the embodiment shown in FIGS. 2 and 3, when the key 26 is not inserted into the key hole 18 of the tumbler 19,
The tumbler 19 projects into the tumbler groove 12 of the case 14. In the conventional side bar lock device, a tumbler groove from which the tumbler projects is not formed in the case. Also,
The side par 21 projects into the locking groove 13 of the case 14.

Next, as shown in FIGS. 4 to 6, when the key 26 is inserted into the keyway 17a of the side bar lock device 10, the key is inserted into the keyhole 18 of the tumbler 19, and the tumbler 19
moves to a retracted position where it does not protrude from the key cylinder 17. Further, the protrusion 21c of the side par 21 is fitted into the opening 26a of the key 26 by the elasticity of the side spring 22, and the side par 21 is fitted into the abutting portion 26a of each tumbler 19.
0 and is moved to a retracted position where it does not protrude from the key cylinder 17. Therefore, the side par 21 can be moved to the retracted position shown in FIG. 5, and the key 30 can be rotated to the unlocked position.

As is clear from FIG. 2, which shows a state in which the key 30 is not inserted into the keyway 17a of the side bar lock device 10, the rotation of the key cylinder 17 is caused by the rotation of the side bar 21 and the tumbler 19.
is prevented by Therefore, due to the shear strength of the side par 21 and the tumbler 19, the strength against unauthorized rotation of the key cylinder 17 can be increased by at least 50% compared to the conventional case. The strength against this breakage actually depends on the shape and dimensions of the side par 21 and tumbler 19.

However, when implementing this invention, there is no need to use particularly small side bars and tumblers, in other words, when obtaining the same strength as compared to conventional side bar locking devices, according to this invention, the side bar locking device can be manufactured in a very small size.

Further, when a tool such as a screwdriver is incorrectly inserted into the keyway 17a, the protrusion 21c of the side parr 21 comes into contact with the tool, so the side parr 21 does not move into the keyway 7a. This makes unauthorized unlocking even more difficult.

Generally, side par 21 has greater shear strength than tumbler 19. Therefore, when an incorrect rotational force is applied to the key cylinder 17, the rotational force is first resisted by the side parr 21, and after the side parr 21 is deformed to some extent, the rotational force is resisted by the tumbler 19. is also possible. As shown in FIG.
It can be made smaller than 2.

The above embodiments of the invention can be modified. For example, as shown in FIGS. 10 to 12, the lid 23 is
4 or may be fixed by crimping the member 27 into the locking recesses 16a, 16b of the hole 16.

Further, as shown in US Pat. No. 3,080,744, the tumbler groove 12 may not be formed and the tumbler 19 may not protrude from the key cylinder 17 into the tumbler groove 12. Further, in the above embodiment, the abutting portion 25 is described as a notch, but instead of the notch, it may be a protrusion formed at a different position on the tumbler 19. In this case, the lock can be unlocked when all the protrusions of the tumblers are fitted into the receiving surfaces or recesses formed in the side bar. Further, in the example shown in FIG. 3, the tumbler 19 projects in two directions, above and below the key cylinder 17, but it may also project either above or below. Although not shown, a second tumbler member that presses the side bar 21 and a spring that presses this tumbler member are connected to the locking groove 13.
It may be placed inside.

In the illustrated example, the side spring 22 is connected to the spring receiving member 27.
is in contact with. In order to prevent the side spring 22 from falling off and avoid direct contact with the legs 23a and 23b of the lid 23, a cover that does not protrude from the outer surface of the key cylinder 17 is fixed to the outside of the side spring 22, or a cover that does not protrude from the outer surface of the key cylinder 17 is fixed to the outside of the side spring 22. A metal ball may also be placed between the legs 23a and 23b of the lid 23. With such a configuration, direct contact between the side spring 22 and the case 14 can be prevented, so that the key cylinder 17 can be rotated smoothly. Although the opening 26a serving as the engaging portion of the key 26 is shown as a through hole, it may be a recess formed at various depths.

As mentioned above, in the sidebar lock device according to the present invention, the protrusion of the sidebar is fitted into the opening of the key, so it is difficult to use a key whose opening is not formed in a predetermined position. Therefore, compared to conventional sidebar lock devices, the anti-theft effect can be significantly improved and damage caused by theft can be reduced.

[Brief explanation of the drawing]

1 is a longitudinal sectional view of a side bar locking device according to the present invention, FIG. 2 is a transverse sectional view, FIG. 3 is a longitudinal sectional view perpendicular to FIG. 1, and FIG. 5 and 6 are sectional views showing the state in which the key is inserted in FIGS. 1, 5, 2, and 3, respectively, and FIG. 7 is an exploded perspective view of the side bar lock 11 according to the present invention. FIG. 8 is a side view of the key. 9 is a sectional view of the key, FIG. 10 is a sectional view along the length of a side bar locking device showing another embodiment of the present invention, FIG. 11 is a cross sectional view of FIG. 10, and FIG. 12 is a sectional view of the key. is a perspective view of FIG. 10; 100. Sidebar locking device, 11. , accommodation hole,
139. Locking groove, 140. Case. 150. Slot, 160. Hole part, 176. key cylinder, 180. keyhole, 190. Tambura, 20
0. Tumbler spring, 21. . Side bar, 21c, protrusion, 220. side spring, 260. Key, 26a. Opening part, Fig. 1 12 /1°10. 19 ＼ 11゛＼ Fig. 4 Fig. 5 1 Convex Fig. 6 Fig. 8 Fig. 9 2'6c 26f Fig. 10 n Fig. 11

Claims (1)

[Claims] A case having a housing hole formed in the length direction, a locking groove formed in the length direction in communication with the housing hole, a keyway formed in the length direction, and a plurality of locking grooves formed in the radial direction. a key cylinder having slots and holes formed at substantially right angles to the slots and rotatably disposed within the receiving hole of the case; A plurality of tumblers having holes, a side bar that is slidably disposed within the hole of the key cylinder, has a protrusion, and can be engaged with a contact portion formed on each tumbler, and the side bar is attached to the tumbler. The tumbler spring is disposed between each tumbler and the key cylinder and biases the tumbler in a direction in which the abutting part of the tumbler is removed from the side bar. When the key is not inserted, the side bar protrudes into the locking groove of the case against the elasticity of the side spring, and when the key is inserted into the key groove of the key cylinder, the side bar protrudes into the abutting part of each tumbler. A side bar locking device characterized in that the protruding portion of the side bar is fitted into an engaging portion formed on the key.