JPH0775688A - Cylinder lock - Google Patents

Abstract

PURPOSE:To make unlocking conditions changeable by constituting any one of engaging recessed parts exclusive of the engaging recessed part corresponding to the spherical body of a second auxiliary key in such a manner that its depth size varies from the depth size of the engaging recessed parts of the first auxiliary key existing in the same position as the position thereof. CONSTITUTION:A key insertion hole 3a of the bore slightly smaller than the bore size of a cavity 2 is formed at the front end of a case 1 having a cylindrical shape and one notched groove 4 is formed at its inner peripheral edge. The front end surface of the shaft part 23 of the key A is provided with the circular recessed part 24 fitting to the front end of a lock shaft 6. The inner peripheral surface of this recessed hole 24 is provided with a projecting part 25 fittable into the notched groove 14 at the front end of the lock shaft 6. The outer peripheral surface at the front end of the shaft part 23 is provided with a projecting part 26 insertable into the notched groove 4 disposed in a key pushing in hole 3 in the same position as the position of the recessed part 25 and is formed with the plural semicircular engaging recessed parts 272 to 277 engaging with respective driving pins 131 to 137 projecting from the lock shaft 6. The second auxiliary key is deeply formed with one of the engaging recessed part exclusive of the engaging recessed part 274 corresponding to the inside spherical body 15 among the engaging recessed parts 271 to 277.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention particularly relates to a cylinder lock in which unlocking conditions can be converted.

[0002]

2. Description of the Related Art A conventional cylinder lock is shown in FIGS.
As shown in FIG. 1, a lock body c is fixedly provided in an inner cavity b of a cylindrical case a, and a lock shaft e is rotatably fitted in a shaft hole d at the center of the lock body c. Further, a plurality of pairs of drive pins f and lock pins g are provided on the lock body c and the lock shaft e so as to be slidable in the axial direction together with the coil spring h.

As shown in FIGS. 19 and 20, each drive pin f projecting from the lock shaft e is stopped by contacting half of the tip end surface with the inner surface of the peripheral edge of the key insertion hole i, and the key j. The engaging recess k having a semicircular cross section formed on the outer peripheral surface of the tip end of each of the keys engages with each drive pin f, and the drive pin f is pushed by the engagement recess k of the key j as shown in FIG. , The lock pin g is pulled into the lock body c, and the engagement between the lock body c and the lock shaft e is released.
This allows the lock shaft e to rotate.

[0004]

By the way, a cylinder lock of this kind is attached to, for example, a front frame of a pachinko machine arranged in a pachinko hall, and is used for opening and closing a glass door frame mounted on the front frame. ing. Normally, the glass door frame is locked during the game, and when the prize hole gets stuck during the game, unlock it and open the glass door frame to remove the hit ball stuck in the prize hole. There is. The cylinder lock used in this way is generally the same type for the same type of pachinko machine, so if you lose the key,
If a third party picks it up, many pachinko machine glass door frames may be unlocked without permission and fraud may occur. Therefore, the present invention has been made to solve the above-mentioned problems, and provides a cylinder lock that can prevent unauthorized unlocking with a lost key when the key is lost by making it possible to convert the unlocking condition. The purpose is to do.

[0005]

In order to achieve the above object, the present invention provides a lock body fixedly in a cylindrical case having a front end surface formed with a key insertion hole, and the center of the lock body. The lock shaft is rotatably fitted into the shaft hole provided in the lock hole, and notch grooves are formed in the inner peripheral edge of the key insertion hole and the outer peripheral edge of the tip of the lock shaft, respectively, and slides axially in the lock body and the lock shaft. By arranging a plurality of lock pins and a drive pin concentrically to prevent or allow the rotation of the lock shaft, a sphere is interposed between the lock pin and the drive pin among the plurality of lock pins and the drive pin. And a circular concave hole that fits into the distal end portion of the lock shaft is formed on the distal end surface of the shaft portion, and a projection portion that fits into the notch groove on the lock shaft side is formed on the inner peripheral surface of the concave hole. Provided on the outer peripheral surface of the tip of the shaft portion is only a semi-circular engagement concave portion with which a plurality of drive pins protruding from the lock shaft are engaged. It is composed of a pair of first auxiliary key and second auxiliary key provided, and one of the second auxiliary keys is one of the first auxiliary keys in which any one other than the engaging recess corresponding to the sphere is in the same position as this. The depth dimension is different from that of the engaging recess.

[0006]

First, the lock shaft is rotated by a predetermined angle using the first auxiliary key to change the position of each through hole of the lock shaft with respect to each receiving hole of the lock body. Then, using the second auxiliary key, the lock shaft is reversely rotated by a predetermined angle to return it to its original position, and the sphere is moved into the through hole corresponding to another specific receiving hole. As a result, the key before conversion cannot be used, and the key after conversion can be used instead.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the cylinder lock L according to the present invention will be described below with reference to the drawings. FIG. 1 is an exploded perspective view of a cylinder lock L. In the figure, reference numeral 1 is a cylindrical shape and has a cavity 2 inside.
In this case, a key insertion hole 3 having an inner diameter slightly smaller than the inner diameter of the cavity 2 is formed at the front end, and one notch groove 4 is formed at the inner peripheral edge of the key insertion hole 3. The lock body 5 and the lock shaft 6 are housed in the cavity 2 along the axial direction.

The lock body 5 is formed in a cylindrical shape having an axial hole 7 in the center, and is fixedly arranged at a rear position in the cavity 2. Further, a plurality of blind hole-shaped receiving holes 81 to 87 are concentrically provided on the front surface of the lock body 5 (seven in the embodiment). The receiving holes 81 to 87 are formed to have the same depth, and the receiving holes 81 to 87 are respectively loaded with the coil springs 9 having the same length and the locking pins 101 to 107 having the same length. ing.

The rear portion of the lock shaft 6 is fitted into the shaft hole 7 of the lock body 5 and is rotatably supported, and the front portion is integrally provided with a circular body portion 11 which is positioned so as to overlap with the front surface of the lock body 5. It is provided in. Each circular body 11 has a receiving hole 81 in the lock body 5.
To 87, the same number of through holes 121 to 127 are concentrically penetrated through, and a plurality of drive pins 131 to 137 formed to have different lengths are slidably inserted into the through holes 121 to 127. Has been done. Further, one notch groove 14 is formed on the outer peripheral edge of the tip end portion of the lock shaft 6 protruding from the circular barrel portion 11.

Opposing surfaces of the pair of lock pins 101 to 107 and the drive pins 131 to 137, which come into contact with each other, are formed in a spherical shape. Reference numeral 15 denotes a sphere having an outer diameter slightly smaller than that of the lock pins 101 to 107 or the drive pins 131 to 137. In the present embodiment, the sphere 15 is provided between a predetermined lock pin 104 and a drive pin 134 which form a pair in advance. Intervenes.

Reference numeral 16 is a mounting substrate fixed to the rear end of the case 1, and a circular hole 17 is formed in the center of the longitudinal direction for inserting the rear end of the lock shaft 6, and the circular hole 17 is sandwiched between the upper and lower parts. The circular arc grooves 18 and 18 are provided opposite to each other, and these circular arc grooves 1
Locking pieces 19, 19 projecting from the rear end of the case 1
Is inserted and the protruding tip is caulked.
Further, 20 and 20 are insertion holes for inserting screws.

As described above, FIG. 2 is a perspective view of the key A which is locked or unlocked by inserting it into the key insertion hole 3 of the cylinder lock L and rotating it. The shaft portion 23 of the key A is formed in a cylindrical shape, and a circular recessed hole 24 that fits into the distal end portion of the lock shaft 6 is provided on the distal end surface thereof. On the inner peripheral surface of the recessed hole 24, a protrusion 25 that can be fitted into the notch groove 14 at the tip of the lock shaft 6.
Is provided. In addition, a protrusion 26 that can be inserted into the notch groove 4 provided in the key insertion hole 3 is provided on the outer peripheral surface of the tip end of the shaft portion 23 at the same position as the protrusion 25, and each drive pin protruding from the lock shaft 6 is provided. Plural engagement recesses 271 to 277 having a semicircular cross section that engage with 131 to 137 are formed (7 locations in the embodiment).

FIG. 3 shows a first auxiliary key A'constituted by cutting off the protrusion 26 provided on the outer peripheral surface of the tip of the key A.
Is. This is to enable the first auxiliary key A ′ to be pulled out from the key insertion hole 3 while the lock shaft 6 is rotated by a predetermined angle because the position of the sphere 15 is not moved. As described above, the lengths of the engaging recesses 271 to 277 formed on the outer peripheral surfaces of the tip end portions of the shaft portions 23 of the key A and the first auxiliary key A ′ are the same as each other. It is formed according to the length of the drive pins 131 to 137. FIG. 6 is a schematic view showing the outer peripheral surfaces of the tip end portions of the shaft portions 23 of the key A and the first auxiliary key A ′ in a developed manner.
The depths of 71 to 277 are represented.

FIG. 4 shows a key B having a configuration slightly different from that of the key A, which is used after the unlocking condition conversion. Also,
FIG. 5 also shows a second auxiliary key B'having a slightly different construction from the first auxiliary key A '. That is, the key B and the second auxiliary key B ′ are different from the key A and the first auxiliary key A ′ in the shaft portion 2
Engaging recesses 271 to 277 provided on the outer peripheral surface of the distal end portion of No. 3
Of the ones other than the engaging recess 274 corresponding to the sphere 15,
One is deeply formed. That is, FIG. 7 is a schematic view showing the outer peripheral surfaces of the tip end portions of the shaft portions 23 of the key B and the second auxiliary key B ', but in the present embodiment, the third engagement recess 273 from the left in the figure is shown. It is formed deeper than the key A and the first auxiliary key A '.

The cylinder lock L having the above-mentioned structure of the present invention
Is used as a device suitable for locking a pachinko machine as shown in FIGS. 8 to 11. In the figure, 21 is a front frame of the pachinko machine, the cylinder lock L has the lock insertion hole 3 positioned on the front side, and the mounting substrate 16 is brought into contact with the rear surface.
Screws 22 and 22 are inserted through the insertion holes 20 and 20, respectively. Next, the operation of the cylinder lock L will be described.
12 to 18 show the action of the lock pins 101 to 107 and the drive pins 131 to 137 provided on the lock body 5 and the lock shaft 6, and the respective receiving holes 81 to 87 of the lock body 5 and the lock shaft 6. Each through hole 1
It is the schematic which shows the positional relationship of 21-127, respectively.

First, when not locked or unlocked, as shown in FIGS. 8, 12A and 12B, the receiving holes 81-87 of the lock body 5 and the through holes 121 of the lock shaft 6 are provided. .. to 127, respectively, and the locking pins 101 to 107 project from the receiving holes 81 to 87 by the urging force of the coil spring 9, and the leading ends of the locking pins 101 to 107 come into contact with the driving pins 131 to 137 and stop. There is. Therefore, in this state, the lock shaft 6 does not rotate. Further, as shown in FIG. 12 (a), the spherical body 15 has the locking pin 10 in the fourth through hole 124 from the left of the lock shaft 6.
4 and the tip of the drive pin 134.

At the time of unlocking, as shown in FIG. 10, the protrusion 26 is provided on the notch groove 4 on the case 1 side, and also on the protrusion 2.
5 are inserted into the cutout grooves 14 on the lock shaft 6 side, the tip of the key A is inserted into the key insertion hole 3, and the lock shaft 6 is pressed as it is. As a result, the drive pins 131 to 137 push the lock pins 101 to 107 against the coil spring 9, and the drive pins 131 to 137 and the tip ends of the lock pins 101 to 107 as shown in FIG. All the contact portions are aligned on the joint surface S between the lock body 5 and the lock shaft 6, and the lock shaft 6 can be rotated.
The sphere 15 is housed in the receiving hole 84 at this time. As a result, the cylinder lock L can be unlocked and simultaneously locked.

Therefore, for example, when the key A used for the cylinder lock L is lost and the key A is earned by a third party, the third party cannot unlock the key A in an unauthorized manner. The procedure for converting the lock condition will be described with reference to FIGS. 12 to 17. In the cylinder lock L shown in FIG.
As shown in (a) and (b), the fourth receiving hole 8 from the left
4 and the lock pin 104 and the drive pin 1 inserted through the through hole 124.
The sphere 15 is interposed between the spheres 34.

First, as shown in FIG. 3, the first auxiliary key A'without the protrusion 26 is used to align the protrusion 25 with the notch groove 14 at the front end of the lock shaft 6, and then, as shown in FIGS. ), Then push it in as shown in Fig. 13,
As shown in FIGS. 14 (a) and 14 (b), the lock shaft 6 is rotated one pitch in the direction of the arrow, and then the first auxiliary key A'is removed as shown in FIG. As a result, the through holes 121 to 127 corresponding to the respective receiving ports 81 to 87 are displaced one by one, and the drive pin 133 inserted into the through hole 123 is opposed to the locking pin 104 of the receiving port 84 in which the spherical body 15 is interposed. Will be done.

Next, with the first auxiliary key A'extracted, the length of the third engagement recess 273 from the left end as shown in FIG. When the second auxiliary key B'formed longer than 'is pushed into the key insertion hole 3 so that the receiving hole 84 and the engaging recess 273 are aligned as shown in FIG. 16A, the second auxiliary key B'is formed. Since the third engaging recess 273 from the left end is formed longer than the first auxiliary key A ′, the drive pin 133 deeply enters the engaging recess 273, and the sphere 15 pushes the locking pin 104 against the locking pin 104. As shown in the figure, the spherical body 15 located in the receiving opening 84 is
Move into 23.

Further, in this state, the second auxiliary key B'is shown in FIG.
(B) When the ball 15 is rotated one pitch in the direction of the arrow and returned to the original position, the spherical body 15 and the through hole 123 of the lock shaft 6 and the third receiving hole 83 from the left end as shown in FIGS. Corresponding to, it moves between the lock pin 103 and the drive pin 133. Also,
At this time, the lock pins 101 to 107 and the drive pins 131 to 1
All of the tip abutting portions of 37 are aligned on the joint surface S between the lock body 5 and the lock shaft 6, so that the lock shaft 6 can be rotated and can be unlocked with the second auxiliary key B ′, that is, the key B in the future. Become. In such a state that the key B is converted so that it can be unlocked and locked,
Even if an attempt is made to unlock with the key A, since the third engagement recess 273 from the left end of the key A is shallower than the key B, the drive pin of the third through hole 123 from the left end of the lock shaft 6 as shown in FIG. 133
Is pushed down and its lower end partly enters into the receiving hole 83 of the lock body 5, so that the lock shaft 6 does not rotate and cannot be unlocked.

The position of the spherical body 15 or the position of the engaging concave portion having a different depth is not limited to that of this embodiment, and can be appropriately selected.

[0023]

As described above, in the cylinder lock of the present invention, a sphere is interposed between a predetermined pair of lock pins and drive pins among a plurality of pairs of lock pins and drive pins, and the position where the sphere is interposed. Since the key is moved by using the first and second auxiliary keys, the unlocking condition can be converted by this, and after the conversion, it is impossible to unlock with the key used until then. Therefore, if the cylinder lock of the present invention is adopted in a pachinko machine, even if the key is lost, unlocking can only be done by converting the unlocking condition and the converted key cannot be unlocked, preventing unauthorized unlocking. It Moreover, there is no need to convert the cylinder lock itself, so that it is extremely economical.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a cylinder lock L.

2 is a perspective view of a key A used for a cylinder lock L. FIG.

FIG. 3 is a perspective view of the first auxiliary key A ′.

4 is a perspective view of another type of key B used for the cylinder lock L. FIG.

FIG. 5 is a perspective view of the second auxiliary key B ′.

FIG. 6 is a plan view showing the outer peripheral surfaces of the tip end portions of a key A and a first auxiliary key A ′ in a developed manner.

FIG. 7 is a plan view showing the outer peripheral surfaces of the tip end portions of a key B and a second auxiliary key B ′ in a developed manner.

FIG. 8 is a sectional view of the cylinder lock L showing a state in which the cylinder lock L is attached to a pachinko machine.

9 is a view taken along the line XX of FIG.

FIG. 10 is a sectional view of the cylinder lock L when unlocked.

11 is a sectional view taken along line YY of FIG.

FIG. 12 is an explanatory view of the action of the cylinder lock L.

FIG. 13 is an explanatory view of the action of the cylinder lock L.

FIG. 14 is an explanatory view of the action of the cylinder lock L.

FIG. 15 is an operation explanatory view of the cylinder lock L.

FIG. 16 is an explanatory view of the action of the cylinder lock L.

FIG. 17 is an explanatory view of the action of the cylinder lock L.

FIG. 18 is an explanatory view of the action of the cylinder lock L.

FIG. 19 is a sectional view of a conventional cylinder lock L and a key.

FIG. 20 is a view taken along the line ZZ in FIG.

FIG. 21 is a cross-sectional view when unlocking the same as above.

[Explanation of symbols]

 1 Case 3 Key insertion hole 4,14 Notch groove 5 Lock body 6 Lock shaft 7 Shaft hole 101 to 107 Locking pin 131 to 137 Drive pin 15 Sphere 24 Recessed hole 25,26 Projection portion 271 to 277 Engagement recess A'No. 1 Auxiliary key B'Second auxiliary key L Cylinder lock

Claims (1)

[Claims] 1. A lock body is fixedly provided in a cylindrical case having a key insertion hole formed in a front end surface thereof, and a lock shaft is rotatably fitted into a shaft hole provided at the center of the lock body, A plurality of locks that respectively form notch grooves on the inner peripheral edge of the key insertion hole and the outer peripheral edge of the tip of the lock shaft, and slide or slide in the lock body and the lock shaft in the axial direction to prevent or allow rotation of the lock shaft. A lock pin and a drive pin are arranged concentrically, and a cylinder lock in which a spherical body is interposed between a pair of lock pin and the drive pin among the plurality of lock pins and the drive pin, and the lock shaft on the tip end surface of the shaft portion A circular concave hole that fits at the tip end of the lock hole is formed, and a protrusion that fits into the notch groove on the lock shaft side is provided on the inner peripheral surface of the concave hole, and the tip outer peripheral surface of the shaft portion protrudes from the lock shaft. It is composed of a pair of first auxiliary key and second auxiliary key provided only with a semicircular engagement concave portion for engaging a plurality of drive pins, The second auxiliary key has a depth dimension different from that of the engaging recess of the first auxiliary key in which any one other than the engaging recess corresponding to the sphere is located at the same position. Cylinder lock.