JP2010242389A - Cylinder lock - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cylinder lock having a simple structure which can realize the insertion and extraction of a key in a locked state, which makes the extraction of the key impossible in an unlocked state, and which can realize the attachment and detachment of an insertion/extraction regulating means which regulates the insertion and extraction of the key. <P>SOLUTION: The cylinder lock 100 is provided with an outer cylinder 10, an inner cylinder 20, the insertion/extraction regulating means 30, a centering spring 40, a dead bolt 50, and a cover 60. The insertion/extraction regulating means 30 is constituted by a base part 30a corresponding to the shape of the engagement groove 12b of the outer cylinder 10 and a convex part 30b and can be attached to and detached from the engagement groove 12b by the engagement of the base part 30a with the engagement groove 12b. The inner cylinder 20 is rotatably engaged with and inserted to the outer cylinder 10, and a tumbler 22 having a notch 22b is movably arranged in the tumbler arrangement part 21 of the inner cylinder 20. In an unlocked state, the insertion/extraction regulating means 30 prevents the movement in which the tumbler is projected from the outer peripheral surface of the inner cylinder. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a cylinder lock that is locked and unlocked by inserting and rotating a key, and in particular, when locked, the key can be inserted into and removed from the lock body. The present invention relates to a cylinder lock that prevents the key from being inserted and removed.

  The cylinder lock has a cylindrical body (cylinder), and an outer cylinder fixed to the lock case and a movable inner cylinder are nested, and the inner cylinder rotates by the movement of the tumbler (obstacle). Then, the deadbolt is moved and unlocked through the cam. Depending on the shape and operating principle of the tumbler, there are pin tumbler and disc tumbler types.

  Conventionally, a disc tumbler type cylinder lock 1 as shown in FIG. 10 is used for doors, drawers and the like. FIG. 10A shows a locked state. FIG. 10B shows an unlocked state. The cylinder lock 1 can be inserted into and removed from the lock body both in the locked state and in the unlocked state.

  The disc tumbler is a thin plate-like disc that has a hole through which the key is changed for each disc. When locking, the upper or lower end of the disc protrudes from the cylinder cylinder. The inner cylinder does not move. When the key is inserted, the disc slides up and down in accordance with the depth of the notch, so that it fits in the inner cylinder and can be rotated.

  As shown in FIG. 10, the cylinder lock 1 includes an outer cylinder 10, an inner cylinder 20, a centering spring 40, a dead bolt 50, and a cover 60. Two engagement grooves 12 a and 12 b are provided in the unlocking region and the locking region on the inner peripheral surface of the outer cylinder 10. In addition, the inner cylinder 20 has a keyhole, and a plurality of tumblers are provided in a direction orthogonal to the axis, and is inserted into the outer cylinder 10 so as to be rotatable.

  In addition, a disk locking device has been proposed that can be inserted and removed from the lock body in both the locked state and the unlocked state, and can be used for applications such as a front door lock (see, for example, Patent Document 1). .

  In the disk locking device disclosed in Patent Document 1, the end plate, each partition plate, and the plate surface of each disk are provided with key insertion holes for inserting and removing keys, respectively. The insertion hole is formed so that the key can be inserted / removed at both ends of the key rotation operation angle range, and the key insertion hole of each disk is formed by the key rotation operation angle range and the disk rotation angle. It is formed so that the key can be inserted / removed at both end positions of the angle range of the difference from the range. In this case, locking and unlocking operations are performed by rotating the key forward and backward.

JP 2001-193322 A

  However, the above-described conventional cylinder lock and the disk lock device disclosed in Patent Document 1 have a structure that allows the key to be inserted into and removed from the lock body both in the locked state and in the unlocked state. If the key is removed from the lock body after locking, there is a drawback that forgetting to lock often occurs.

  Therefore, from the viewpoint of preventing forgetting to lock, in applications such as cashiers such as drawers, safes, stores, etc., a structure in which the key inserted into the lock body cannot be removed when unlocked is desired. .

  Therefore, the present invention has a simple structure in which the key can be inserted into and removed from the lock body when locked, and the key inserted into the lock body cannot be removed when unlocked. An object of the present invention is to provide a cylinder lock in which an insertion / removal restricting means for restricting the insertion / removal of a key is removable.

  In order to solve the above-described problems, a cylinder lock according to the present invention has an outer cylinder provided with two or more engagement grooves for forming an unlocking region and a locking region on an inner peripheral surface, a key hole, and orthogonal to the axis. A plurality of tumbler arrangement portions are formed in the direction of the inner cylinder, the inner cylinder is rotatably fitted to the outer cylinder, the tumbler arrangement section is movably arranged, and protrudes from the outer peripheral surface of the inner cylinder. A tumbler for restricting rotation of the inner cylinder when engaged with the engagement groove, and an insertion / removal restricting means for restricting insertion / removal of a key provided in at least one engagement groove of the outer cylinder, and being unlocked The insertion / removal restricting means prevents the tumbler from projecting from the outer peripheral surface of the inner cylinder.

  For example, the tumbler is a plate-shaped tumbler having a key hole, and a notch is formed by recessing a position in contact with the insertion / removal restricting means in a locked state of the tumbler.

  Further, for example, the insertion / removal restricting means can be attached to and detached from the engaging groove of the outer cylinder.

  Further, for example, the insertion / removal restricting means is a convex portion formed integrally with the outer cylinder, and the root of the convex portion is formed smaller than the end portion.

  Also, for example, the insertion / removal restricting means is a rod-like or plate-like member that is inserted from the outside of the outer cylinder and whose insertion position can be controlled by an actuator.

  According to the present invention, the cylinder lock has a simple structure by providing the insertion / removal restricting means for restricting the insertion / removal of the key in the engagement groove provided in the unlocking region of the outer cylinder. It is possible to easily remove the key inserted into the lock body in the unlocked state when the key can be inserted and removed. Therefore, in applications such as cash registers such as drawers, safes, stores, etc., when the key is removed from the lock body after unlocking, forgetting to lock can be prevented.

  In addition, since the notch portion is formed by recessing the position where it comes into contact with the insertion / removal restricting means in the locked state of the tumbler, the rotation position of the inner cylinder is at a position other than the unlocking region of the outer cylinder. Normal operation can be performed without being affected by existence.

  Further, the insertion / removal restriction means can be easily attached / detached to / from the engagement groove of the outer cylinder, so that the insertion / removal restriction can be easily switched at the time of manufacture as required.

  Further, the insertion / removal restricting means has the advantage that the number of parts is reduced and the assembling work is simplified by making the protrusions integrally formed with the outer cylinder. In addition, since the root of the convex portion is formed smaller than the end portion, the convex portion can be folded, and the insertion / removal restriction can be easily switched as necessary during manufacturing.

  Further, the insertion / removal restricting means is a rod-like or plate-like member that is inserted from the outside of the outer cylinder and whose insertion position can be controlled by the actuator, so that the insertion / removal can be arbitrarily restricted as necessary.

It is an exploded view showing composition of cylinder lock 100 of a 1st embodiment. FIG. 2 is an assembly diagram illustrating a configuration of a cylinder lock 100. FIG. 6 is a diagram (part 1) illustrating an operation of the cylinder lock 100; FIG. 6 is a diagram (part 2) illustrating the operation of the cylinder lock 100; It is FIG. (1) which shows operation | movement of the cylinder lock 100 when there is no insertion / extraction control means. It is FIG. (2) which shows operation | movement of the cylinder lock 100 when there is no insertion / extraction control means. It is sectional drawing which shows the structure of 100 A of cylinder locks of 2nd Embodiment. It is sectional drawing which shows the structure of the cylinder lock 100B of 3rd Embodiment. It is sectional drawing which shows the structure of the cylinder lock 200 of 4th Embodiment. It is sectional drawing which shows the structure of the conventional cylinder lock 1.

  Hereinafter, the form for carrying out the cylinder lock concerning the present invention is explained with reference to figures.

  The cylinder lock according to the present invention includes a plate-shaped tumbler operated by a key pile of a key, and when a regular key is inserted into the key hole, the plate-shaped tumbler is submerged in the inner tube and the inner tube is It is formed to be rotatable.

  FIG. 1 is an exploded view showing a configuration of a cylinder lock 100 according to the first embodiment of the present invention. FIG. 2 shows the assembled state of the cylinder lock 100. 3 and 4 are diagrams illustrating the operation of the cylinder lock 100. FIG.

  As shown in FIGS. 1 to 4, the cylinder lock 100 includes an outer cylinder 10, an inner cylinder 20, an insertion / removal restricting means 30, a centering spring 40, a dead bolt 50, and a cover 60.

  The outer cylinder 10 includes a cylindrical portion 11, two engagement grooves 12 a and 12 b that form an unlocking region and a locking region on the inner peripheral surface, and a case 13 that houses a centering spring 40 and a dead bolt 50. The engaging grooves 12 a and 12 b are formed along the axial direction of the cylindrical portion 11 and are provided to allow the tumbler 22 disposed on the inner cylinder 20 to move from the outer peripheral surface of the inner cylinder 20. is there.

  The inner cylinder 20 has a cylindrical outer peripheral surface and a keyhole, and a plurality of tumbler arrangement portions 21 are formed in a direction orthogonal to the axis. The inner cylinder 20 is rotatably inserted into the outer cylinder 10. A disk-shaped tumbler 22 is arranged in the tumbler arrangement portion 21 so as to be movable (slidable). Further, the tumbler 22 has a key hole 22a, and a notch 22b is formed by denting a position in contact with the insertion / removal restricting means 30 in a locked state. The tumbler 22 is urged downward by the pin spring 23. Further, when the tumbler 22 protrudes from the outer peripheral surface of the inner cylinder 20 and engages with the engaging grooves 12a and 12b, the rotation of the inner cylinder 20 is restricted.

  The insertion / removal restricting means 30 is made of, for example, a resin material, and includes a base portion 30a and a convex portion 30b corresponding to the shape of the engagement groove 12b. This insertion / removal restricting means 30 is detachable by fitting the base portion 30a into the engagement groove 12b. Further, the convex portion 30 b has a size corresponding to the cutout portion 22 b of the tumbler 22. In this example, the convex portion 30b is a rib protruding from the base portion 30a, but is not limited thereto. You may make it form a convex part only in the position corresponding to the 1 or several tumbler 22. FIG.

  The centering spring 40 is for reliably returning the operating piece to the initial position. Further, the dead bolt 50 is a pin interlocked with the rotating operation of the inner cylinder 20, and in this example, a drawer type is shown. The cover 60 covers the back side of the case 13 and has a hole through which a mounting screw or the like is passed.

  Next, the operation of the cylinder lock 100 will be described with reference to FIGS.

  FIG. 3A is a cross-sectional view showing a state where the key of the cylinder lock 100 is not inserted. As shown in FIG. 3A, in a state where the key K is not inserted, the tumbler 22 is urged by the pin spring 23, protrudes from the outer peripheral surface of the inner cylinder 20, and is exposed downward (on the engagement groove 12b side). ing. Therefore, the lower part of the tumbler 22 prevents rotation, and the inner cylinder 20 cannot be rotated. Further, in this case, since the tumbler 22 is provided with the notch 22b, it is not affected by the presence / absence of the insertion / removal restricting means 30.

  FIG. 3B is a cross-sectional view showing a state in which the cylinder lock 100 is being inserted. As shown in FIG. 3B, the tumbler 22 slides in the vertical direction due to the unevenness of the key edge surface during the key insertion state, and the engagement groove 12 a is provided on the inner surface of the outer cylinder 10. Therefore, the tumbler 22 can be moved up and down, and the key K can be inserted.

  FIG. 4A is a cross-sectional view showing a state in which the key of the cylinder lock 100 is inserted. As shown in FIG. 4 (a), when the key K ticks match, all the tumblers 22 do not protrude from the outer peripheral surface of the inner cylinder 20 when the key K is inserted, and In both cases, since the rotation is not prevented, the inner cylinder 20 can be rotated. This state is an unlockable state.

  FIG. 4B is a cross-sectional view showing the unlocked state of the cylinder lock 100. In the case of FIG. 4B, the key K is rotated 180 degrees from the state of FIG. As shown in FIG. 4B, in the unlocked state, the edge surface on which the concave and convex portions of the key K are formed faces downward, that is, the side surface of the tumbler 22 where the cutout portion 22b is located is at the upper position. The side surface without the notch 22 (side surface facing the notch portion 22b) faces downward, and in this state, all the tumblers 22 are held by the convex portions 30b of the insertion / removal restricting means 30 so that the outer periphery of the inner cylinder 20 There is no portion protruding from the surface, and the inner cylinder 20 can be rotated, but the key K cannot be removed. If the key K is to be pulled out, the tumbler 22 is pushed downward by the unevenness of the key K (that is, the key pile), but cannot move when hitting the convex portion 30b of the insertion / removal restricting means 30. As a result, the key K cannot be removed.

  Moreover, since the inner cylinder 20 is rotatable, when the key K is rotated 180 degrees from the state shown in FIG. In the locked state, as shown in FIG. 3B described above, the tumbler 22 can freely slide up and down, so that the key K can be inserted and removed.

  Next, the operation of the cylinder lock 100 when there is no insertion / removal restriction means 30 will be described with reference to FIGS.

  FIG. 5A is a cross-sectional view showing a state where no key is inserted. As shown in FIG. 5A, when the key K is not inserted, the tumbler 22 is urged by the pin spring 23, protrudes from the outer peripheral surface of the inner cylinder 20, and is exposed downward (on the engagement groove 12b side). ing. Therefore, the lower part of the tumbler 22 prevents rotation, and the inner cylinder 20 cannot be rotated. Further, in this case, the cutout portion 22b is provided in the tumbler 22, but since there is no insertion / removal restricting means 30, the operation is not affected. That is, in a state where the key K is not inserted, the tumbler 22 is biased by the pin spring 23, protrudes from the outer peripheral surface of the inner cylinder 20, and is exposed downward (on the engagement groove 12b side).

  FIG. 5B is a cross-sectional view showing a state during key insertion. As shown in FIG. 5B, during the key insertion state, the tumbler 22 moves up and down due to the unevenness of the key edge surface as in the state shown in FIG. Since the engagement groove 12a is provided on the inner surface of the tumbler, the tumbler 22 can be moved up and down, and the key K can be inserted.

  FIG.5 (c) is sectional drawing which shows the state in which the key was inserted. As shown in FIG. 5C, when the key K ticks match, all the tumblers 22 do not protrude from the outer peripheral surface of the inner cylinder 20 in the state in which the key K is inserted, and In both cases, since the rotation is not prevented, the inner cylinder 20 can be rotated. This state is an unlockable state.

  FIG. 6A is a cross-sectional view showing an unlocked state. In the case of FIG. 6A, the key K is rotated 180 degrees from the state of FIG. As shown in FIG. 6 (a), the edge surface on which the concave and convex portions of the key K are formed faces downward, that is, the side surface where the cutout portion 22b of the tumbler 22 is located at the upper position, and the cutout portion of the tumbler 22 The side surface without the surface (the side surface facing the notch portion 22b) faces downward, and in this state, since the insertion / removal restricting means 30 does not exist, the inner cylinder 20 can be rotated and the key K can be pulled out. .

  FIG. 6B is a cross-sectional view showing a state where the key K is to be removed in the unlocked state. As shown in FIG. 6B, when the key K is to be pulled out, the tumbler 22 tends to be pushed downward due to the unevenness of the key K, and there is no insertion / removal restricting means 30, so the movement is not restricted, and as a result, Key K can be inserted and removed.

  That is, when the insertion / removal restricting means 30 is provided, the key K can be inserted / removed in the locked state, and the key K cannot be removed in the unlocked state. On the other hand, when the insertion / removal restriction means 30 is removed, the key K can be inserted / removed both in the locked state and in the unlocked state as in the prior art.

  As described above, in the present embodiment, the cylinder lock 100 includes the outer cylinder 10, the inner cylinder 20, the insertion / removal restricting means 30, the centering spring 40, the dead bolt 50, and the cover 60. The insertion / removal restricting means 30 includes a base portion 30a corresponding to the shape of the engagement groove 12b of the outer cylinder 10 and a convex portion 30b. The base portion 30a is fitted into the engagement groove 12b, whereby the engagement groove 12b. It is detachable with respect to. Moreover, the inner cylinder 20 is rotatably inserted with respect to the outer cylinder 10, and the tumbler 22 which has the notch part 22b is arrange | positioned at the tumbler arrangement | positioning part 21 of the inner cylinder 20 so that a movement is possible.

  Thereby, it is possible to easily realize that the key can be inserted into and removed from the lock body in the locked state with a simple structure, and that the key inserted into the lock body cannot be removed in the unlocked state. Therefore, in applications such as cash registers such as drawers, safes, stores, etc., when the key is removed from the lock body after unlocking, forgetting to lock can be prevented.

  Further, the insertion / removal restriction means 30 can be easily switched to the insertion / removal restriction at the time of manufacture by making it detachable from the engagement groove 12b of the outer cylinder 10.

  FIG. 7 is a cross-sectional view showing a configuration of a cylinder lock 100A according to the second embodiment of the present invention. FIG. 7 shows a state where the key K is not inserted in a cross section at a position where the tumbler 22 of the cylinder lock 100A is disposed.

  The cylinder lock 100A has the same configuration as the cylinder lock 100 of the first embodiment described above, in addition to the insertion / removal restricting means 30A.

  As shown in FIG. 7, engagement grooves 12 a and 12 b are provided in the unlocking region and the locking region on the inner peripheral surface of the outer cylinder 10. The engagement grooves 12 a and 12 b are provided to allow the tumbler 22 disposed in the inner cylinder 20 to move so as to protrude from the outer peripheral surface of the inner cylinder 20.

  The inner cylinder 20 has a cylindrical outer peripheral surface and a keyhole, and a plurality of tumbler arrangement portions 21 are formed in a direction orthogonal to the axis. A disk-shaped tumbler 22 is movably arranged in the tumbler arrangement portion 21. The tumbler 22 has a keyhole 22 a and a notch 22 b and is urged downward by a pin spring 23. The inner cylinder 20 is rotatably inserted into the outer cylinder 10.

  The insertion / removal restricting means 30 </ b> A is a convex portion formed integrally with the outer cylinder 10. Since the root of the insertion / removal restricting means 30A is formed smaller than the end portion, the convex portion can be folded as necessary. Further, the convex portion has a size corresponding to the cutout portion 22 b so as to be inserted into the cutout portion 22 b of the tumbler 22.

  Thus, in the present embodiment, the cylinder lock 100A includes the outer cylinder 10, the inner cylinder 20, and the insertion / removal restricting means 30A. The insertion / removal restricting means 30A is a convex part formed integrally with the outer cylinder 10, and the root is formed smaller than the end part.

  Thereby, the cylinder lock 100A of the second embodiment can obtain the same effects as those of the first embodiment described above, and the insertion / removal restricting means 30A is formed on the convex portion formed integrally with the outer cylinder 10. As a result, the number of parts is reduced, and the assembly work can be simplified. Further, since the root of the insertion / removal restricting means 30A is formed to be smaller than the end portion, the convex portion can be broken, and the insertion / removal restriction can be easily switched as necessary during manufacturing.

  FIG. 8 is a cross-sectional view showing a configuration of a cylinder lock 100B according to the third embodiment of the present invention. FIG. 8 shows a state in which the key K is not inserted in a cross section at a position where the tumbler 22 of the cylinder lock 100B is disposed.

  The cylinder lock 100B has the same configuration as the cylinder lock 100 of the first embodiment described above, in addition to the insertion / removal restricting means 30B.

  As shown in FIG. 8, engagement grooves 12 a and 12 b are provided in the unlocking region and the locking region on the inner peripheral surface of the outer cylinder 10. The engagement grooves 12 a and 12 b are provided to allow the tumbler 22 disposed in the inner cylinder 20 to move so as to protrude from the outer peripheral surface of the inner cylinder 20.

  The tumbler 22 has a keyhole 22 a and a notch 22 b and is urged downward by a pin spring 23. The inner cylinder 20 is rotatably inserted into the outer cylinder 10.

  The insertion / removal restricting means 30B is a bar-like or plate-like member that is inserted from the outside of the outer cylinder 10 and whose insertion position can be controlled by an actuator. The insertion / removal restricting means 30 </ b> B has a size corresponding to the notch 22 b so as to be inserted into the notch 22 b of the tumbler 22. Moreover, as a rod-shaped or plate-shaped member, for example, a solenoid or the like can be used.

  Thus, in the present embodiment, the cylinder lock 100B includes the outer cylinder 10, the inner cylinder 20, and the insertion / removal restricting means 30B. The insertion / removal restricting means 30B is a bar-like or plate-like member that is inserted from the outside of the outer cylinder 10 and whose insertion position can be controlled by an actuator.

  As a result, the cylinder lock 100B of the third embodiment can obtain the same effects as those of the first embodiment described above, and the insertion / removal restricting means is inserted from the outside of the outer cylinder 10 and is inserted by the actuator. By using a bar-like or plate-like member that can be controlled, insertion / removal can be arbitrarily controlled.

  FIG. 9 is a cross-sectional view showing a configuration of a cylinder lock 200 according to the fourth embodiment of the present invention. In FIG. 9, a state where the key K is not inserted is shown in a cross-section at a position where the tumbler 22 of the cylinder lock 200 is disposed.

  As shown in FIG. 9, the cylinder lock 200 has two pairs of unlocking regions and locking regions on the inner peripheral surface of the outer cylinder 10, that is, four engagement grooves 12a, 12b, 12c, 12d. The engaging grooves 12 a, 12 b, 12 c, and 12 d are provided to allow the tumbler 22 disposed in the inner cylinder 20 to move so as to protrude from the outer peripheral surface of the inner cylinder 20. The tumbler 22 has a keyhole 22 a and a notch 22 b and is urged downward by a pin spring 23. The inner cylinder 20 is rotatably inserted into the outer cylinder 10.

  Further, the insertion / removal restricting means 30 has the same configuration as that of the first embodiment described above. In this example, two insertion / removal restricting means 30 are disposed in the engaging grooves 12b and 12c of the outer cylinder 10, respectively. Further, the insertion / removal restricting means 30 can be attached and detached by fitting the base portion 30a into the engagement grooves 12b and 12c.

  Thus, in the present embodiment, the cylinder lock 200 has the four engagement grooves 12a, 12b, 12c, and 12d on the inner peripheral surface of the outer cylinder 10. Of these, the insertion / removal restricting means 30 is disposed in the engagement grooves 12b, 12c.

  Thereby, the cylinder lock 200 of the fourth embodiment can restrict the insertion and removal of the key at two positions on the circumference.

  In the above-described embodiment, the cylinder lock of the disk tumbler has been described. However, the present invention is not limited to this. It can also be applied to cylinder locks having other types of tumblers.

  In the above embodiment, the insertion / removal restricting means 30 is formed from a resin material, but the present invention is not limited to this. For example, you may make it form from a metal material.

  In the above-described embodiment, the drawer type cylinder lock has been described. However, the present invention is not limited to this.

  The present invention can be used for the purpose of restricting the insertion and removal of the key when the cylinder lock is unlocked.

DESCRIPTION OF SYMBOLS 10 Outer cylinder 11 Cylindrical part 12a, 12b, 12c, 12d Engaging groove 20 Inner cylinder 21 Tumbler arrangement part 22 Tumbler 22a Key hole 22b Notch part 23 Pin spring 30, 30A, 30B Insertion / removal restricting means 30a Base part 30b Convex part 40 Centering spring 50 Deadbolt 60 Cover 100, 100A, 100B, 200 Cylinder lock K key

Claims (5)

An outer cylinder provided with two or more engagement grooves for forming an unlocking region and a locking region on the inner peripheral surface;
An inner cylinder having a key hole, in which a plurality of tumbler arrangement portions are formed in a direction orthogonal to the axis, and is rotatably inserted into the outer cylinder;
A tumbler that is movably disposed in the tumbler placement portion, and that projects from the outer peripheral surface of the inner cylinder and engages with the engagement groove;
An insertion / removal restricting means for restricting insertion / removal of a key, provided in at least one engagement groove of the outer cylinder;
In the unlocked state, the insertion / removal restricting means prevents the movement of the tumbler protruding from the outer peripheral surface of the inner cylinder. The tumbler is a plate-shaped tumbler having a keyhole,
The cylinder lock according to claim 1, wherein a notch portion is formed by recessing a position in contact with the insertion / removal restricting means in a locked state of the tumbler.   The cylinder lock according to claim 1 or 2, wherein the insertion / removal restricting means is detachable from an engagement groove of the outer cylinder.   The cylinder lock according to claim 1 or 2, wherein the insertion / removal restricting means is a convex portion formed integrally with the outer cylinder, and a root of the convex portion is formed smaller than an end portion. .   The cylinder lock according to claim 1 or 2, wherein the insertion / removal restricting means is a rod-like or plate-like member that is inserted from the outside of the outer cylinder and whose insertion position can be controlled by an actuator.

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