JPH0725172U - Cylinder lock - Google Patents

Abstract

(57) [Abstract] [Purpose] To reduce the thickness of keys used for cylinder locks with high anti-theft property. The half tumblers 13 and 14 are engaged with the tumbler grooves 2 and 4, respectively, and engaging portions 13a and 14a that prevent the key cylinder 5 from rotating, and a key engaging portion with which the key 19 is engaged. 16a and 17a. When the key 19 is inserted into the key insertion groove 12, the half tumbler 13 engages with the key crest 21 to move the half tumbler 13 and separate the engaging portion 13 a from the tumbler groove 2. The part 16a is provided. The other half tumbler 14
When the key 19 is inserted into the key insertion groove 12, the key 1
9 engages with the groove wall 22 formed in the half tumbler 14
And a key engaging portion 17a for moving the engaging portion 14a away from the tumbler groove 2.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a lock device, and particularly to a cylinder lock that is difficult to unlock.

[0002]

[Prior art]

 The cylinder lock may be unlocked illegally by a picking operation that unlocks using a special tool instead of using the regular key. In general, against such illegal unlocking, the number of tumblers that are slidably arranged in the key cylinder and that engage with the tumbler groove of the case is increased to make picking difficult. However, it is not possible to place a tumbler on the key cylinder with an extremely small spacing between tumblers. In other words, the number of tumblers depends on the key cylinder and key length. Therefore, a cylinder lock was proposed in which two half tumblers were inserted into one slit without changing the key cylinder and key length to increase the total number of tumblers and prevent unauthorized unlocking. .

[0003]

[Problems to be solved by the device]

 By the way, even if a pair of half tumblers are arranged in the slit and the total number of tumblers is increased, it is impossible for the conventional cylinder lock to reliably prevent picking. That is, it takes a lot of time and labor for picking, but if one of the pair of half tumblers is picked and the key cylinder is slightly rotated, and then the other half tumbler is picked, the illegal unlocking is possible. . As disclosed in Japanese Utility Model Laid-Open No. 3-74763, a cylinder lock provided with a pair of half tumblers is disclosed in order to solve the above-mentioned drawbacks. In this cylinder lock, a pair of half tumblers are slidably juxtaposed on the same plane in the slit, and a convex part that conceals the key engagement part when the half tumbler is engaged deeper in the tumbler groove than in the normal state is provided. Since it is provided on the key cylinder, it is difficult to move the half tumbler by engaging the picking tool with the key engaging portion of the half tumbler. Therefore, there is an effect that the illegal unlocking by the picking can be surely prevented. However, since the key engaging portions of both half tumblers abut on the key crests of the key, there is a disadvantage that the key needs to have a sufficient thickness and the thickness of the key cannot be reduced. Therefore, an object of the present invention is to provide a cylinder lock capable of reliably preventing illegal unlocking due to picking and using a thin key similar to the conventional one.

[0004]

[Means for Solving the Problems]

 According to the present invention, a case having an accommodation hole having a tumbler groove on the inner peripheral surface thereof, a key cylinder having a key hole rotatably provided in the case accommodation hole, and a key cylinder directly intersecting the key hole. The slits are formed in the slits, the pair of half tumblers slidably attached to the slits on the same plane, and the pair of springs that bias the pair of half tumblers in the same direction. Each of the half tumblers includes an engaging portion that engages with the tumbler groove and prevents rotation of the key cylinder, and a key engaging portion that engages with the key. When the key is inserted into the key insertion groove, the key engagement part of one half tumbler engages with the key crest to move one half tumbler, separates the engagement part from the tumbler groove, and the other The key engaging portion of the half tumbler engages with the groove wall formed in the key to move the other half tumbler to separate the engaging portion from the tumbler groove.

[0005]

[Action]

 When the key cylinder is rotated after the engaging portion of one half tumbler is separated from the tumbler groove by the picking operation, the other half tumbler is engaged with the tumbler groove deeper than usual. In this state, the lug of the key cylinder hides the key engaging part of the other half tumbler, so it becomes difficult to move the other half tumbler to the unlock position by the picking tool, and it is possible to prevent illegal unlocking by picking. Can be stopped. Further, since the key engaging portion of one half tumbler engages with the key mountain and the key engaging portion of the other half tumbler engages with the groove wall of the key, it is possible to reduce the thickness of the key. Become.

[0006]

Embodiment An embodiment of the cylinder lock according to the present invention will be described below with reference to FIGS. The cylindrical case 1 is provided with a housing hole 2 formed on the inner surface and tumbler grooves 3 and 4 formed in the housing hole 2 in the diameter direction. The key cylinder 5 rotatably arranged in the accommodation hole 2 is formed with a key hole 6 formed in the length direction and a key 19 formed on the inner surface of the key hole 6 and shown in FIGS. 6 and 7. It is provided with lugs 7 and 8 which fit into the formed groove portions 20a and 20b. As shown in FIG. 2, the key cylinder 5 is provided with eight slits 9 formed in the key hole 6 at substantially right angles and at equal intervals. A full tumbler 10 having the shape shown in FIG. 4 is slidably arranged in the slit 9. When the key 19 is not inserted, the engaging portion 10a provided at one end of the full tumbler 10 is tumbled by the tumbler spring 11 with the elasticity. Pressed into 3 or 4 and engaged. The key insert hole 12 provided in the central portion of the full tumbler 10 is provided with a key engaging portion 12a with which the key crest 21 is engaged when the key 19 is inserted. A pair of half tumblers 13, 14 is slidably arranged in the slit 9a. When the key 19 is not inserted, the engaging portions 13a and 14a provided at one end of the half tumblers 13 and 14 are engaged with the tumbler groove 3 or 4 by the elastic force of the tumbler spring 15 as shown in FIG. It The half tumblers 13 and 14 are arranged so that the end edge portions 13b and 14b of the pair of half tumblers 13 and 14 contact each other on the center plane of the slit 9. The key insertion hole 12 formed in the half tumbler 13 is provided with a notch 16 for inserting a key and a key engaging portion 16a with which the key crest 21 of the key 19 is engaged. The key insertion hole 12 of the half tumbler 14 is provided with a notch 17 for inserting a key and an abutting portion 17a with which the groove wall 22 of the key 19 engages. Further, inclined guide portions 18 and 18 having a shape separated from the accommodation hole 2 are provided on the outer edges of the spring receiving lugs 13c and 14c of the half tumblers 13 and 14, respectively.

The blade body 20 having a rectangular cross section of the key 19 shown in FIGS. 6 and 7 is provided with groove portions 20 a and 20 b into which the lugs 7 and 8 of the key hole 6 are fitted, and the key body protruding from the blade body 20. The crests 21 are thinner than the blade body 20. When the regular key 19 is inserted into the key hole 6 of the key cylinder 5, the key crest 21 is engaged with the key engaging portion 12a of the full tumbler 10 and the key engaging portion 16a of the half tumbler 13, and the groove of the key 19 is engaged. The wall 22 is engaged with the contact portion 17 a of the half tumbler 14. The full tumbler 10 and the half tumblers 13 and 14 are moved in the direction of arrow A against the tumbler springs 11 and 15, respectively, and the outer edge portions of the engaging portions 10a, 13a and 14a are the same as the outer peripheral surface of the key cylinder 5. Since the key cylinder 5 is moved on or inside the cylindrical surface (shear line) and comes out of the tumbler grooves 3 and 4, the key cylinder 5 can be rotated by the key 19 as shown in FIG. Then, a picking operation is performed and, as shown in FIG. 1, after all the full tumblers 10 and all the half tumblers 13 on one side are moved on the shear line, the key cylinder 5 is rotated by a predetermined angle in the direction of arrow B. Consider the case of being moved. That is, as shown in FIG. 1, the engaging portion 13a of the right half tumbler 13 and the engaging portion 10a of the full tumbler 10 are on the same plane as the outer peripheral surface of the accommodation hole 2, and the engaging portion of the left half tumbler 14 is The portion 14 a is engaged with the tumbler groove 3. In this state, the key engaging portion 17a of the half tumbler 14 is arranged on the back side of the lug 8 projecting in the key hole 6, so that the key engaging portion 17a is engaged with the picking tool to move the engaging portion 14a. It is virtually impossible to move the half tumbler 14 in the direction away from the tumbler groove 3, and the picking operation can be reliably prevented.

When the picking operation is completed in the state shown in FIG. 1, the unlocking of the cylinder lock is prevented, but the key engagement of the half tumbler 14 is exceeded beyond the position where the rounded tip 34 of the key 19 passes. Since the joint portion 17a is moved in the radial direction, when the key 19 is inserted into the key hole 6, the tip portion 34 of the key 19 comes into contact with the key engaging portion 17a so that the key 19 is fully inserted into the key hole 6. I can't insert it. However, when the key cylinder 5 is rotated counterclockwise after inserting the tip portion 34 of the key 19 into the key hole 6, the guide portion 18 of the half tumbler 14 resists the elastic force of the tumbler spring 15 and the tumbler groove. 3 is moved radially inward along the open end 3a to the normal position shown in FIG. Then, when the key 19 is fully inserted into the key hole 6, the groove wall 22 of the blade body 20 of the key 19 moves the half tumbler 14 inward in the radial direction. When the key 19 is fully inserted into the key hole 6, the half tumbler 14 is moved to the unlock position shown in FIG. 5, and the key cylinder 5 can be rotated and the cylinder lock can be released. In contrast to FIG. 1, FIG. 8 shows a state in which the half tumbler 13 projects into the tumbler groove 3 and the half tumbler 14 is in the unlocked position.

In the above embodiment, the key engaging portions 16 a and the contact portions 17 a of the two half tumblers 13 and 14 individually abut on the key crests 21 and the groove walls 22 of the key 19, respectively. The main body 20 and the key mountain 21 can be formed thin.

The cylinder lock of the present invention can be changed. For example, as shown in FIGS. 9 and 10, the engaging portion 14a of only the half tumbler 14 may have a substantially arc shape instead of a fan shape. Further, when the half tumbler 14 is at the lock position and before the key 19 is inserted, the key cylinder 5 is rotated by the engaging portion 14a of the half tumbler 14 even if the half tumbler 14 is arranged at the position shown in FIG. 3 or 10 instead of in FIG. Can be blocked.

[0011]

[Effect of device]

 As described above, in the cylinder lock according to the present invention, the key engaging portions of the one and the other half tumblers individually engage with the key ridges and the groove walls of the key, thereby reducing the thickness of the key and locking the cylinder lock. It is possible to reduce the size.

[Brief description of drawings]

FIG. 1 is a sectional view of a cylinder lock showing a picking prevention state.

FIG. 2 is a sectional view of the cylinder lock along the length direction.

FIG. 3 is a sectional view taken along line BB of FIG.

FIG. 4 is a sectional view taken along the line AA of FIG.

FIG. 5 is a sectional view showing a state of a half tumbler when a regular key is inserted into a cylinder lock.

FIG. 6 is a side view of the key.

FIG. 7 is a sectional view of the key.

FIG. 8 is a cross-sectional view showing a picking prevention state different from FIG.

9 is a sectional view showing another embodiment of the present invention corresponding to FIG.

10 is a sectional view showing another embodiment of the present invention corresponding to FIG.

[Explanation of symbols]

1. ． ． Case, 2. ． ． Storage hole, 3, 4. ． ． Tumbler groove, 5. ． ． Key cylinder, 6. ． ． Key hole, 7, 8. ． ． Rug, 9. ． Slit, 1
2. ． ． Key insertion hole, 13, 14. ． ． Half tumbler, 16a, 17a. ． ． Key engaging portion, 18. ． ．
Guide part, 19. ． ． Key, 21. ． ． Key Mountain, 2
2. ． ． Groove wall,

Claims (2)

[Scope of utility model registration request] 1. A case having an accommodation hole having a tumbler groove on an inner peripheral surface thereof, a key cylinder having a key hole rotatably provided in the accommodation hole of the case, and a key cylinder orthogonal to the key hole. A cylinder lock comprising a slit formed, a pair of half tumblers slidably attached to the slit on the same plane, and a pair of springs biasing the pair of half tumblers in the same direction. Each of which includes an engaging portion that engages with the tumbler groove to prevent rotation of the key cylinder, and a key engaging portion with which the key engages, and when the key is inserted into the key insertion groove, A cylinder lock characterized in that a key engaging portion of one half tumbler is engaged with a key mountain to move the one half tumbler and separate the engaging portion from the tumbler groove. 2. The key engaging portion of the other half tumbler,
The cylinder lock according to claim 1, wherein the cylinder lock is engaged with a groove wall formed in the key to move the other half tumbler to separate the engaging portion from the tumbler groove.