JPH0358629B2 - - Google Patents

Description

[Detailed description of the invention] Industrial applications The present invention relates to cylinder locks.

Prior Art In this type of cylinder lock, a tumbler 3 is housed in a vertical groove 2 of a rotor 1, as shown in FIG.
The tumbler 3 is resiliently engaged with the engagement groove 6 on the outer cylinder 5 side via the spring 4, and a key 8 is inserted into the square hole 7 in the center of the tumbler 3.
In order to insert the key 8 and align the shear line, insert the key groove 9 formed on the side edge of the key 8 as shown in
For example, the depth of the groove 9 is h ₁ , as shown in the figure.
Three types, h ₂ and h ₃ , are selected and various combinations are used.

On the other hand, the rotor 1 and the outer cylinder 5 are molded with zinc or resin, etc., and it is extremely difficult to form the sliding surfaces of both 1 and 5 into a perfect circle due to mold accuracy, molding conditions, etc., especially when molded with resin. There is a slight gap between the outer circumferential wall of the rotor 1 and the inner circumferential wall of the outer cylinder 5 due to sink marks caused by changes over time, and therefore, the amount of protrusion of the tumbler 3, that is, the engagement allowance, is lost by the amount of the gap. Normally, the pitch of keyway 9 is 0.5.
Since the distance is set to 0.8 mm, if the gap between the rotor 1 and the outer cylinder 5 is 0.2 mm, the engagement distance for one tumbler 3 will be 0.3 to 0.6 mm.

Problems to be Solved by the Invention If the tumbler 3 can only be engaged with the engagement recess 6 with such a small engagement distance, for example, if the keyway 9 is engaged once due to unauthorized use of the key 8, etc. If you try to open the lock with the key 8, which only has a different number, the engagement distance of that single tumbler 3 is only 0.3 to 0.6 mm, so it will easily open the lock. When it comes to combinations of numbers, it is necessary to avoid the most different combinations, and there is a disadvantage that the number of such combinations is reduced.

Means for Solving the Problems The present invention aims to solve such problems and increase the number of combinations of keys. In a cylinder lock that accommodates a tumbler and elastically engages the tumbler with an engagement groove on the outer cylinder side via a spring, a cylinder made of a metal plate is fitted to the rotor, and the cylinder lock The present invention is characterized in that it includes a square hole that aligns with the engagement groove, and a locking piece that is bent from a side edge of the square hole and snaps onto the engagement groove.

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 3 and 4. Reference numerals 1 to 9 in the figures indicate the same parts as those shown in FIG. It fits into the cylindrical body 10 made of
The cylindrical body 10 has a square hole 11 that aligns with the engagement groove 6.
and a locking piece 12 which is bent from the side edge of the square hole 11 and snaps into the engagement groove 6.

As shown in FIG. 4a, the cylindrical body 10 is made by punching out a rectangular metal plate with several notches arranged in the center and both side edges. By making cuts perpendicular to the metal plate, bending the tips of the separation pieces 13 separated by these cuts at right angles, and then bending both sides of the metal plate so as to join them, as shown in FIG. 4b. It is formed into a cylindrical body, and at this time, a square hole 11 is formed with a gap formed between each separation piece 13, and the separation piece 1
A locking piece 12 is formed by the bent piece at the tip of 3,
Further, each separation piece 13 is bent inward to press down the rotor 1.

Thus, as shown in FIG. 3, the rotor 1 and the outer cylinder 5
Even if there is a gap E between the two, the separation piece 13 of the elastic metal cylinder 10 comes into close contact with the rotor 1, and the tip of the separation piece 13 is bent and locked in the engagement groove 6 of the outer cylinder. Since the structure is such that the piece 12 is locked, if the tumbler 3 protrudes even slightly toward the engagement groove 6 through the vertical groove 2, the tumbler 3 will abut against the locking piece 12 in the rotating direction, and its rotation will be blocked.

In other words, the entire amount S of protrusion from the rotor is effective. Furthermore, since the cylinder is made of metal, even if the outer cylinder side is made of resin or zinc, the wall of the locking groove will not be scraped by the tumbler.

Effects of the Invention As described above, according to the present invention, a cylindrical body 10 made of a metal plate is fitted to the rotor 1, and a square hole 11 that aligns with the engagement groove 6 and a side of the square hole 11 are provided in the cylindrical body 10. Since the locking piece 12 is bent from the edge and snaps into the engagement groove 6, there is no looseness between the rotor 1 and the outer cylinder 5, and since the cylinder body 10 is made of metal, the locking groove 6 is bent. Since the wall of 16 is not scraped down, the tumbler 3 engages with the engagement groove 6 via the locking piece 12 of the cylindrical body 10 even if it is engaged with one piece, so the rotor 1 is unnecessarily moved. Since there is no rotation, it is possible to freely combine the most different key grooves and increase the number of key combinations.
Since it can be easily machined into a perfect circle compared to molded products made of zinc, resin, etc., it has the effect of being able to adhere tightly to the rotor 1 installed inside and making the rotation of the rotor 1 smooth.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing a conventional example, FIG. It is an explanatory view showing a processing state. 1...rotor, 3...tumbler, 4...spring,
5...Outer cylinder, 6...Engagement groove, 10...Cylinder body, 1
1... Square hole, 12... Locking piece.

Claims (1)

[Claims] 1. A cylinder lock in which a plurality of tumblers are accommodated in a rotatable rotor housed in an outer cylinder, and the tumblers are elastically engaged with an engagement groove on the outer cylinder side via a spring, A cylindrical body made of a metal plate is fitted to the rotor, and the cylindrical body has a square hole that aligns with the engagement groove, and the cylinder is bent from the side edge of the square hole and hits the engagement groove. A cylinder lock characterized by being provided with a locking piece.