Combination lock

Abstract

To change from a fixed mode to a free mode by turning operation of an actuator.SOLUTION: A dial lock includes a lock case 3, an actuator A, a lock bar R, a plurality of dial connecting cylinders T fitted into the lock bar R, and a dial D fitted to each dial connecting cylinder. Cylinder locking means F is provided between the dial connecting cylinder and the lock case, dial engagement means G is provided between the dial connecting cylinder and the dial, and a cam receiving wall W is provided at the base end of the lock bar. The actuator is formed with a blocking cam surface 11, a pushing cam protrusion 12, an unlocking cam surface 14, and an expanding cam protrusion 15. The cam receiving wall is formed with a fixed mode contact surface M that contacts the blocking cam surface and the unlocking cam surface and a recess 16 that avoids a contact with the enlarged cam protrusion, and is formed with a mode changer E that protrudes into and out of this recess and pushes the lock bar until it contacts the enlarged cam protrusion and disengages the dial engagement means.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a combination lock used for opening and closing doors of lockers, cabinets, etc. [Background technology]

[0002] Dial locks are also called dial locks or code lock devices, and are arranged so that they can be unlocked using a personal identification number (dial code), which allows the actuator to rotate, and by rotating the actuator, the latch can be moved to the locked or unlocked position. The dial lock can be used in two modes: a free mode in which the user can freely set the PIN number for the unlocking arrangement, and a fixed mode in which the PIN number for the unlocking arrangement is fixedly set.These modes can be switched by operating a mode switch from the back of the dial lock.

[0003] The code locking device of Patent Document 1, which is a prior art, includes a plurality of dials with a plurality of codes displayed on the circumferential surface, an operating shaft that supports each dial rotatably at a predetermined position and is capable of reciprocating in an axial direction, an actuator having a cylindrical body that rotates in response to an unlocking operation and a locking operation, a reciprocating mechanism that is provided between the cylindrical body and the operating shaft and that reciprocates the operating shaft in response to the forward and reverse rotation of the cylindrical body, and a lock gear provided corresponding to the position of each dial on the operating shaft, and by the forward movement of the operating shaft in response to a locking operation, all the lock gears are engaged with each dial to store an unlocking code string, and by the return movement of the operating shaft in response to an unlocking operation, all the lock gears are engaged with each dial to store an unlocking code string The locking mechanism is provided with a temporary memory mechanism that releases the engagement between the lock gears and each dial to release the memory of the unlocking code sequence, a spring member that biases the operating shaft in the backward movement direction, and a locking mechanism that allows the actuator to operate when the codes on each dial are aligned to form the unlocking code sequence and restricts the operation of the actuator when they are not aligned, and is also provided with a switching mechanism that switches between a first memory method using the temporary memory mechanism that releases the memory of the unlocking code sequence with each unlocking operation, and a second memory method that maintains the memory of the unlocking code sequence without releasing the engagement between all of the lock gears and each dial by keeping the operating shaft displaced in the forward movement direction in response to the unlocking operation.

[0004] The switching mechanism includes a rotatable switching shaft, one end of which is a switching knob that can be rotated from the outside, a drive cylinder, one end of which is fitted over the other end of the switching shaft and the other end surface of which is provided with a cylindrical pressing member that constitutes a camshaft that rotates eccentrically integrally with the forward and reverse rotation of the switching shaft, and a bushing fitted to the tip of the operating shaft so as to reciprocate integrally with the operating shaft and having a contact surface against which the circumferential surface of the pressing member of the drive cylinder abuts, and the pressing member eccentrically rotates integrally with the rotation operation of the switching knob to set the second memory mode, pressing the contact surface of the bushing to displace the operating shaft in the forward movement direction, and also eccentrically rotates integrally with the rotation operation of the switching knob to set the first memory mode, releasing the pressure on the contact surface of the bushing to form a drive mechanism that cooperates with the spring member to displace the operating shaft in the backward movement direction (Claim 1). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 4481317 Summary of the Invention [Problem to be solved by the invention]

[0006] In the above-mentioned prior art, the pressing member can push the bushing and operating shaft by rotating the switch knob, but the switch knob is a small part with a small diameter, and it is difficult to generate enough power to push the bushing and operating shaft by rotating the switch knob itself. The object of the present invention is to provide a combination lock that can solve the problems of the prior art.

[0007] The object of the present invention is to provide a dial lock in which an actuator is provided with an unlocking cam surface for fixed mode and an enlarged cam protrusion for free mode, a fixed mode abutment surface is provided on the cam receiving wall of the lock bar, and a mode switch for free mode is provided, and by switching this mode switch from a retracted position to an active position, it is possible to change from fixed mode to free mode by rotating the actuator. [Means for solving the problem]

[0008] The specific means for solving the problem in the present invention comprises a lock case 3, an actuator A having a latch 4 at its tip and supported by the lock case 3 to rotate the latch 4 from an unlocked position K to a locked position S, a lock bar R arranged perpendicular to the actuator A and supported by the lock case 3 so as to be movable in the axial direction, a plurality of dial connecting tubes T fitted to the lock bar R so as to be integrally movable and rotatable, and a dial D fitted to each dial connecting tube T and having a plurality of symbols d on its outer periphery, Between the dial connecting tube T and the lock case 3, a tube locking means F is provided which restricts movement of the dial connecting tube T in the bar axial direction and allows movement by aligning the dial connecting tube T at one position in the circumferential direction. Between the dial connecting tube T and the dial D, a dial engaging means G is provided, which can change the fitting position of the dial D relative to the dial connecting tube T by the number of symbols d and can be engaged and disengaged by moving the dial connecting tube T in the bar axial direction, A cam receiving wall W is provided on the base end side of the lock bar R, and the actuator A is formed with a blocking cam surface 11 that abuts against the cam receiving wall W to prevent the actuator A from rotating when the actuator A is in the locked position S, and a pushing cam protrusion 12 that pushes the lock bar R when the actuator A rotates. The actuator A is formed with an unlocking cam surface 14 adjacent to the pushing cam protrusion 12, which abuts against the cam receiving wall W when the actuator A is in the unlocking position K, and an enlarged cam protrusion 15 adjacent to the unlocking cam surface 14 at an extension position of the pushing cam protrusion 12. The cam receiving wall W is formed with a fixed mode abutment surface M that abuts against the blocking cam surface 11, pushing cam protrusion 12, and unlocking cam surface 14 of the actuator A, and a recess 16 that avoids abutment with the expanding cam protrusion 15. A mode switching device E is provided that protrudes retractably into this recess 16 and pushes the lock bar R until it abuts against the expanding cam protrusion 15 and releases the dial engagement means G between the dial connecting tube T and the dial D. [Effects of the Invention]

[0009] According to the present invention, when the mode changer (free mode / fixed mode conversion device) is protruded from the retracted position and changed to the operating position where the expanding cam protrusion abuts, the lock bar can be moved by the force of rotating actuator A to change from fixed mode to free mode without moving the lock bar with the mode changer. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is an exploded perspective view showing an embodiment of the present invention. [Figure 2]FIG. [Figure 3] FIG. [Figure 4] FIG. 4 is a cross-sectional view taken along line XX in FIG. 3. [Figure 5] FIG. 4 is a cross-sectional view taken along line YY in FIG. 3. [Figure 6] FIG. 2 is an exploded perspective view of the lock bar, the dial connecting tube, and the dial. [Figure 7] FIG. [Figure 8] The actuator is locked in the fixed mode, (A) is a plan view, (B) is a cross-sectional view, and (C) is a cross-sectional perspective view. [Figure 9] The actuator is rotated in the fixed mode, (A) is a plan view, (B) is a cross-sectional view, and (C) is a cross-sectional perspective view. [Figure 10] The actuator is in the unlocked state in the fixed mode, (A) is a plan view, (B) is a perspective view with a part of the dial connecting tube cut away, and (C) is a perspective view of the cross section. [Figure 11] The actuator is locked in the free mode. (A) is a plan view, (B) is a cross-sectional view, and (C) is a cross-sectional perspective view. [Figure 12] The actuator is rotated in free mode, (A) is a plan view, and (B) is a cross-sectional view. [Figure 13] The actuator is in the unlocked state in the free mode, (A) is a plan view, (B) is a cross-sectional view, and (C) is a cross-sectional perspective view. [Figure 14] FIG. 4 is a cross-sectional view taken along line ZZ in FIG. [Figure 15] FIG. 10 is an overall perspective view with the blind cover attached. [Figure 16] This is a rear perspective view with the blindfold cover attached. [Figure 17] FIG. [Figure 18] FIG. 10 is a plan view showing a modified example of the mode switching device. [Figure 19] FIG. 10 is a rear view showing a modified example of the mode switching device. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Figures 1 to 5 show the internal structure of dial lock 1, which comprises a lock case 3, an actuator A having a latch 4 at its tip and supported by lock case 3 to rotate latch 4 from unlocked position K to locked position S, a lock bar R arranged perpendicular to actuator A and supported on lock case 3 so as to be movable axially, a plurality of dial connecting tubes T fitted to lock bar R so as to be movable and rotatable integrally with it, and a dial D fitted to each dial connecting tube T and having a plurality of symbols d on its outer periphery.

[0012] A dial section 27 is provided within the lock case 3 to restrict the movement of multiple dials D in the bar axis direction, and a spring 28 for returning the lock bar is provided between the tip of the lock bar R and the lock bar tip support portion of the lock case 3. The lock case 3 is generally attached vertically to the edge of an opening / closing door 42 of a locker 41 or the like, with an actuator A placement hole 3a formed at the bottom and a support space for the lock bar R, dial D, etc. formed at the top, with the axis of the actuator A and the axis of the lock bar R arranged approximately perpendicular to each other, and a latch 29 resiliently protruding from the upper back side.

[0013] The lock case 3 is formed with a bar receiving portion 18 that supports the tip of the lock bar R so that it can move in the bar axis direction, a tube receiving portion 19 that supports the dial connecting tube T, and a lock protrusion 20 that protrudes from this tube receiving portion 19. The lock bar R has a cylindrical bar portion whose tip is supported by the bar support 18, and a rectangular cam receiving wall W formed integrally with the base end thereof. A mode switching device E is rotatably disposed through this cam receiving wall W, and is approximately perpendicular to the axis of the lock bar R. The axis of the mode switching device E is parallel to the actuator A.

[0014] The lock case 3 has a tube receiving portion 19 formed in its middle portion that can support the dial connection tube T. The tube receiving portion 19 has four tube receiving portions 19a and one auxiliary tube receiving portion 19b on the bar base end side. The four tube receiving portions 19a form arc-shaped concave surfaces in the partition wall, with lock protrusions 20 protruding upward from the bottom of these arc-shaped concave surfaces, and the one auxiliary tube receiving portion 19b has an arc-shaped concave surface formed therein that can support the tube portion of the dial connection tube T.

[0015] 1 and 3 to 6, four dial connecting tubes T are arranged in series on the lock bar R, and each comprises a tube portion Ta that fits onto the lock bar R and can be received by the lock protrusion 20, a flange portion Tb that protrudes from one end of the tube portion Ta to a larger diameter than the tube portion Ta and can be received on the arc-shaped concave surface of the tube receiving portion 19, an engagement protrusion Tc that protrudes from the outer periphery of the tube portion Ta adjacent to the flange portion Tb and constitutes the dial engagement means G, and one lock groove 22 that is formed in a concave shape in the flange portion Tb and constitutes the tube lock means F.

[0016] The flange portion Tb of the dial connecting tube T can move in the direction of the bar axis so that the lock groove 22 fits into the lock protrusion 20 when the lock groove 22 faces the lock protrusion 20 in the circumferential phase, and by fitting, the rotation of the dial connecting tube T is locked, and the flange portion Tb faces the arc concave surface of the tube receiving portion 19a. When the lock groove 22 is misaligned with respect to the lock protrusion 20 in the circumferential phase (personal identification number misalignment), the flange portion Tb of the dial connecting tube T abuts against the end face of the lock protrusion 20, thereby preventing movement in the bar axial direction.

[0017] The lock groove 22 of the dial connecting tube T and the lock protrusion 20 of the lock case 3 restrict movement of the dial connecting tube T in the direction of the bar axis when the personal identification number is not aligned. A cylinder locking means F is configured to allow the movement of the dial connection cylinder T by aligning the PIN number by aligning the position at one point in the circumferential direction. Furthermore, when the lock groove 22 is shifted relative to the lock protrusion 20 in the circumferential phase, the cylinder portion Ta of the dial connecting cylinder T faces the lock protrusion 20 of the adjacent cylinder receiving portion 19a and the arcuate concave surface of the auxiliary cylinder receiving portion 19b.

[0018] 1, 4 to 6, and 14, a pin hole 24 that is open to the back surface of the lock case 3 is formed in the lock protrusion 20 of the adjacent tube receiving portion 19a that supports the tube portion Ta of the dial connecting tube T, and in the arc-shaped concave surface of the auxiliary tube receiving portion 19b. A pin groove 25 that is circumferentially aligned with the lock groove 22 is formed in the tube portion Ta of the dial connecting tube T, and into which a pin 23 can be engaged. Therefore, when the dial connecting tube T rotates relative to the lock bar R, i.e., when the lock groove 22 is misaligned relative to the lock protrusion 20 in the circumferential phase, the pin 23 such as a pin, needle, wire, clip pin, etc. can be inserted through the pin hole 24 to search for the pin groove 25 of the dial connecting tube T, thereby enabling the PIN position of the dial connecting tube T to be found.

[0019] The pin hole 24 of the lock protrusion 20 and the pin groove 25 of the tubular portion Ta constitute a search mechanism 44 that searches for the PIN number of the dial D when the locker is opened with the emergency unlocking key and the PIN number becomes unknown. The dial D has a plurality of symbols d, for example, 10 types of numbers from "0" to "9," attached at equal intervals on its outer periphery, and engagement grooves Da corresponding to all of the symbols and engagement / disengagement protrusions Db between these engagement grooves Da are formed on its inner periphery. The radially inner end of this engagement / disengagement protrusion Db is supported by the cylindrical portion Ta of the dial connecting cylinder T so as to be rotatable and axially movable. The length in the axial direction of this engagement / disengagement protrusion Db is set to be approximately half the width of the dial D.

[0020] There are 1 to 10 engagement protrusions Tc (3 at equal circumferential intervals in this embodiment) on the outer periphery of the tubular portion Ta of the dial connecting tube T, which engage with the engagement groove Da when the dial D is fitted. The engagement position between the dial connecting tube T and the dial D can be selected as many times as the number of symbols, and there are three engagement protrusions Tc on the outer periphery of the tubular portion Ta of the dial connecting tube T, which are provided at equal circumferential intervals, and the engagement position can be changed by moving the dial connecting tube T in the direction of the bar axis relative to the dial D by the length of the engagement / disengagement protrusions Db to release the engagement between the engagement protrusions Tc and the engagement / disengagement protrusions.

[0021] The engagement protrusion Tc of the dial connecting tube T and the engagement / disengagement protrusion Db of the dial D constitute a dial engagement means G that can change the engagement position of the dial D relative to the dial connecting tube T by the number of symbols d and can be engaged and disengaged by moving the dial connecting tube T in the bar axial direction, and this change in engagement position is a change in the symbol d of the dial D that corresponds to the lock groove 22 of the dial connecting tube T. 1, 3, 4, 6, 14, and 16, the mode changer E is formed of a cylindrical material that is parallel to the actuator A and can rotate, and the portion exposed to the recess 16 of the cam receiving wall W is formed in a semicircular shape, and the arc surface of this semicircular shape serves as a pushing surface Ea that can come into contact with the expanding cam protrusion 15, and the flat surface of the semicircular shape is approximately parallel to the inner surface of the recess 16 and serves as an avoidance surface Eb that avoids contact with the expanding cam protrusion 15.

[0022] The rear end of the mode switching device E is exposed on the back surface of the lock case 3, and is formed with a tool engagement portion Ed that can be engaged with a rotating tool such as a flathead screwdriver.By engaging a tool with this tool engagement portion Ed and rotating it 180 degrees, the pushing surface Ea can be switched between an active position in which it protrudes from the recess 16 and a retracted position in which it is buried within the recess 16. 1 to 4, 7, and 15, the actuator A has an actuator cylinder A1 with a cam surface formed on its outer periphery, a key cylinder A2 that passes through the actuator cylinder A1 and has a latch 4 at its tip, and a knob A3 that fits into the base of the key cylinder A2. A key groove 45 for inserting a key that communicates with the inside of the key cylinder A2 is formed in the knob A3.

[0023] The outer peripheral surface of the actuator cylinder A1 faces the cam receiving wall W and mode changer E at the base end of the lock bar R so as to be able to abut against them, and is formed with a blocking cam surface 11 that abuts against the fixed mode abutment surface M of the cam receiving wall W, a pushing cam protrusion 12, an unlocking cam surface 14, and an expanding cam protrusion 15 that abuts against the mode changer E. The cam surface on the outer periphery of the actuator cylinder A1 is divided into two sections in the axial direction. The blocking cam surface 11 and the pushing cam projection 12 share two sections.

[0024] The cam receiving wall W also has a cam contact surface divided into two sections, and the pushing surface Ea of the mode changer E protrudes freely into and out of the recess 16 adjacent to the fixed mode contact surface M, thereby forming the contact surface for the free mode. Figure 8 shows the locked state in fixed mode, with (A) being a plan view, (B) being a cross-sectional view, and (C) being a cross-sectional perspective view (mode switch E is shown hatched), and actuator A is set to the locked state in fixed mode.

[0025] When the actuator A is in the locked position S with the latch 4 protruding to the side and the PIN number on the dial D is misaligned, the fixed mode abutment surface M of the cam receiving wall W abuts against the blocking cam surface 11, preventing the actuator A from rotating and the lock bar R from being pushed. When the PIN number on the dial D is aligned in the locked position S, the lock groove 22 of the dial connecting tube T faces the lock protrusion 20 of the lock case 3, allowing the dial connecting tube T to move. Then, the actuator A is allowed to rotate.

[0026] Figure 9 shows the transition from the locked state to the unlocked state in the fixed mode, with (A) being a plan view, (B) being a cross-sectional view, and (C) being a cross-sectional perspective view, in which actuator A is rotated counterclockwise from the locked state in the fixed mode. When actuator A is rotated counterclockwise by 90 degrees, the push cam protrusion 12 is allowed to push the lock bar R, and actuator A can be rotated until the unlock cam surface 14 abuts against the fixed mode abutment surface M. This rotation places actuator A in the unlocked position K, where the latch 4 protrudes downward.

[0027] The movement of the lock bar R by the pushing cam protrusion 12 is a distance that does not disengage the engagement protrusion Tc from the engagement / disengagement protrusion Dc, and is approximately half of the total movement, so the positional relationship of the symbol d of the dial D corresponding to the lock groove 22 of the dial connecting tube T remains unchanged. Figure 10 shows the unlocked state in the fixed mode, where (A) is a plan view, (B) is a perspective view with a portion of the dial connecting tube T cut away, and (C) is a cross-sectional perspective view. In the fixed mode, the actuator A and latch 4 are rotated to the unlocked position K.

[0028] The unlocking cam surface 14 of the actuator A abuts against the fixed mode abutment surface M, holding the lock bar R in a fixed position, in the same way as the blocking cam surface 11 abuts against the fixed mode abutment surface M. When the PIN number on the dial D is aligned and the actuator A is turned from the unlocked position K to the locked position S, the lock bar R is moved by the pushing cam projection 12, and the contact surface with the fixed mode contact surface M is shifted from the unlocking cam surface 14 to the blocking cam surface 11. Even in this case, the dial engagement means G is not released, so the positional relationship of the code d on the dial D corresponding to the lock groove 22 on the dial connecting tube T remains unchanged.

[0029] Therefore, even if the actuator A is rotated to the unlock position K or the lock position S while the PIN number on the dial D is aligned, the PIN number is fixed, and the lock is used in the fixed mode. In this fixed mode, the mode switching device E is in a state where the pushing surface Ea does not protrude from the recess 16 of the cam receiving wall W, and is in a retracted state where the pushing surface Ea is buried, and there is no surface against which the expanding cam protrusion 15 abuts even when the actuator A rotates.

[0030] To switch from fixed mode to free mode, the mode changer E is rotated 180 degrees so that the pushing surface Ea protrudes from the recess 16 in the cam receiving wall W, and when the pushing surface Ea is put into an active state, the actuator A is rotated so that the expanding cam protrusion 15 abuts against the pushing surface Ea, and the lock bar R is placed in free mode, allowing it to move fully. The mode changeover by rotating the mode changeover device E can be performed whether the actuator A and the latch 4 are in the locked position S or the unlocked position K.

[0031] Figure 11 shows the locked state in free mode, with (A) being a plan view, (B) being a cross-sectional view, and (C) being a cross-sectional perspective view. Actuator A in free mode is set to the locked state, and other than the protruding direction of mode switch E, it is the same as the locked state of actuator A in fixed mode. In other words, when the actuator A is in the locked position S with the latch 4 protruding to the side and the PIN number on the dial D is misaligned, the fixed mode abutment surface M of the cam receiving wall W abuts against the blocking cam surface 11, preventing the actuator A from rotating and the lock bar R from being pushed.

[0032] When the PIN number on the dial D is aligned in the locked position S, the lock groove 22 of the dial connecting tube T faces the lock protrusion 20 of the lock case 3, allowing the dial connecting tube T to move. Then, the actuator A is allowed to rotate. FIG. 12(A) is a plan view and (B) is a cross-sectional view showing the transition from the locked state to the unlocked state in the free mode, in which the actuator A is rotated counterclockwise from the locked state in the free mode.

[0033] The pushing surface Ea of the mode changer E in the free mode protrudes until it is approximately flush with the fixed mode contact surface M of the cam receiving wall W, and the pushing cam protrusion 12 contacts and pushes the lock bar R, just as when the actuator A is moving in the fixed mode. That is, when the actuator A is rotated while the lock bar R is allowed to be pushed, the pushing cam protrusion 12 comes into contact with the pushing surface Ea, which is substantially flush with the fixed mode contact surface M.

[0034] The movement of the lock bar R by the pushing cam protrusion 12 is a distance that does not disengage the engagement protrusion Tc from the engagement / disengagement protrusion Dc, and is approximately half of the total movement, so the positional relationship of the symbol d of the dial D corresponding to the lock groove 22 of the dial connecting tube T remains unchanged. 13A, 13B, and 13C are plan, cross-sectional, and perspective cross-sectional views, respectively, showing the unlocked state in the free mode, in which the actuator A has been rotated to the unlocked position K in the free mode.

[0035] The pushing surface Ea of the mode changer E in the free mode is approximately flush with the fixed mode contact surface M of the cam receiving wall W, and the actuator A causes the enlarged cam protrusion 15 at the extended position of the pushing cam protrusion 12 to contact the pushing surface Ea, causing the lock bar R to move completely beyond halfway. The total movement of the lock bar R by the expanding cam protrusion 15 is the distance that disengages the engagement protrusion Tc and the engagement / disengagement protrusion Dc, the dial engagement means G is released, the positional relationship of the symbol d of the dial D corresponding to the lock groove 22 of the dial connecting tube T becomes free, the restriction on the PIN number is released, and each dial D can be turned freely, allowing the PIN number to be changed to the user's preference.

[0036] A new PIN number is set by placing the actuator A and the latch 4 in the unlocked position K in the free mode and rotating the dial D. In Figures 2, 4, 15 to 17, a case cover 30 is attached to the lock case 3, and this case cover 30 is formed with an actuator hole 33 that exposes the end of the actuator A, a dial window 34 that exposes the dial D, and a handle portion 35 that can be hooked with the fingers and is parallel to the actuator hole 33 and the dial window 34.

[0037] The actuator A and the dial D are arranged in a vertical relationship, and the handle portion 35 is positioned parallel to this arrangement, resulting in a compact arrangement. In addition, a blind cover 36 that can be opened and closed to hide the sign d of the dial D exposed from the dial window 34 is attached to the front side of the case cover 30. This blind cover 36 has a cover body 52 that can be opened and closed attached to a mounting base 51. The mounting base 51 is engaged by inserting locking claws 51a on the left and right ends into the upper part of the case cover 30 from the front, and the cover body 52 has short shafts 52a on the left and right ends that engage with the left and right ends of the mounting base 51.

[0038] 18 and 19 show modified examples of the mode changer E. While the mode changer E of the above embodiment rotates around an axis, a mode changer E2 of the modified example is of a sliding type. The mode changer E2 has a front-to-rear circular contact body 55 fixed to the tip of a rod 54. The rod 54 passes through an elongated hole 56 formed in the cam receiving wall W at the end of the lock bar R, and the end exposed from the back surface of the lock case 3 can be grasped and slid within the elongated hole 56.

[0039] The abutment body 55 is arranged in the recess 16 of the cam receiving wall W, and can be moved forward and backward by sliding the rod 54 from a retracted position shown by the phantom lines in Figure 18 to an active position in the center of the recess 16 shown by the solid lines. The arcuate convex surface of the contact body 55 is the pushing surface Ea, which is substantially flush with the fixed mode contact surface M of the cam receiving wall W, and only in the unlocked state of the free mode, the expanded cam protrusion 15 of the actuator A When the expanding cam protrusion 15 comes into contact with the pushing surface Ea of the contact body 55 in the protruding position, the lock bar R is moved to its full extent, and the dial engagement means G between the dial connecting tube T and the dial D can be released.

[0040] As in the embodiment, the mode changer E2 of the modified example is preferably slid from the retracted position to the protruding operating position when the opening / closing door 42 of the locker 41 is opened, the actuator A and the latch 4 are in the locked position S, and the blocking cam surface 11 of the actuator A is in contact with the fixed mode contact surface M of the cam receiving wall W. The pushing surface Ea of the contact body 55 is approximately flush with the fixed mode contact surface M, so it hardly comes into sliding contact with the blocking cam surface 11, and even if it does come into sliding contact, the resistance is very small compared to pushing the lock bar R, so that switching from fixed mode to free mode can be easily performed with a light force.

[0041] In the above-described embodiment, the device comprises a lock case 3, an actuator A having a latch 4 at its tip and supported by the lock case 3 to rotate the latch 4 from the unlocked position K to the locked position S, a lock bar R disposed perpendicular to the actuator A and supported by the lock case 3 so as to be movable in the axial direction, a plurality of dial connecting tubes T fitted to the lock bar R so as to be movable and rotatable integrally therewith, and a dial D fitted to each dial connecting tube T and having a plurality of symbols d on its outer periphery, Between the dial connecting tube T and the lock case 3, a tube locking means F is provided which restricts movement of the dial connecting tube T in the bar axial direction and allows movement by aligning the dial connecting tube T at one position in the circumferential direction. Between the dial connecting tube T and the dial D, a dial engaging means G is provided, which can change the fitting position of the dial D relative to the dial connecting tube T by the number of symbols d and can be engaged and disengaged by moving the dial connecting tube T in the bar axial direction, A cam receiving wall W is provided on the base end side of the lock bar R, and the actuator A is formed with a blocking cam surface 11 that abuts against the cam receiving wall W to prevent the actuator A from rotating when the actuator A is in the locked position S, and a pushing cam protrusion 12 that pushes the lock bar R when the actuator A rotates. The actuator A is formed with an unlocking cam surface 14 adjacent to the pushing cam protrusion 12, which abuts against the cam receiving wall W when the actuator A is in the unlocking position K, and an enlarged cam protrusion 15 adjacent to the unlocking cam surface 14 at an extension position of the pushing cam protrusion 12. The cam receiving wall W is formed with a fixed mode abutment surface M that abuts against the blocking cam surface 11, pushing cam protrusion 12, and unlocking cam surface 14 of the actuator A, and a recess 16 that avoids abutment with the expanding cam protrusion 15. A mode switching device E is provided that protrudes retractably into this recess 16 and pushes the lock bar R until it abuts against the expanding cam protrusion 15 and releases the dial engagement means G between the dial connecting tube T and the dial D.

[0042] With this configuration, simply by projecting the mode changer E into the recess 16, the lock bar R can be pushed and moved until the expansion cam protrusion 15 of the actuator A comes into contact with the dial engagement means G and the release dial connecting tube T separates from the dial D, making it easy to change from the fixed mode to the free mode. In addition, in the above embodiment, the mode switching device E extends from the portion that protrudes into the recess 16 of the cam receiving wall W to the end that is exposed on the back surface of the lock case 3, and a pushing surface Ea that can abut against the enlarged cam protrusion 15 is formed at the portion that protrudes into the recess 16 of the cam receiving wall W. With this configuration, the mode changer E can be formed in a simple shape with only the pushing surface Ea.

[0043] Furthermore, in the above embodiment, the mode switching device E is formed of a cylindrical material that is parallel to the actuator A and can rotate, and the portion exposed to the recess 16 of the cam receiving wall W is formed in a semicircular shape, and this semicircular arc surface becomes a pushing surface Ea that can come into contact with the expanding cam protrusion 15, and the semicircular flat surface becomes an avoidance surface Eb that is approximately parallel to the back surface of the recess 16 and avoids contact with the expanding cam protrusion 15. This configuration allows the mode changer E to have a simple cylindrical shape with one end made semicircular. It can be formed.

[0044] Furthermore, in the above embodiment, the lock case 3 is formed with a bar receiving portion 18 that supports the lock bar R so that it can move in the bar axial direction, a tube receiving portion 19 that supports the dial connecting tube T, and a lock protrusion 20 that protrudes from this tube receiving portion 19. The dial connecting tube T is formed with a tube portion Ta that fits into the lock bar R, a flange portion Tb that protrudes from the tube portion Ta at one end of the tube portion Ta and can be received in the tube receiving portion 19, an engagement protrusion Tc that protrudes from the outer periphery of the tube portion Ta adjacent to the flange portion Tb and constitutes a dial engagement means G, and one lock groove 22 that is formed in a concave shape in the flange portion Tb and constitutes a tube lock means F.

[0045] With this configuration, the dial engagement means G and the barrel locking means F can be easily configured. In the above-described embodiment, the cylinder receiving portion 19 of the lock case 3 is formed with a pin hole 24 into which a pin 23 can be inserted from the back surface of the lock case 3, A pin groove 25 into which the pin 23 can be engaged is formed at a position that coincides with the lock groove 22 in the circumferential direction on the cylindrical portion Ta of the dial connecting cylinder T. With this configuration, when the dial connecting tube T rotates relative to the lock bar R, the pin 23 can be inserted into the pin hole 24 to search for the pin groove 25 of the dial connecting tube T, thereby enabling the PIN number position of the dial connecting tube T to be searched for.

[0046] In the embodiment, the actuator A includes a blocking cam surface 11, a pushing cam protrusion 12, and an unlocking cam surface 14. , and The actuator includes a cylindrical actuator body A1 having an expanding cam protrusion 15 formed on its outer periphery, a key cylinder A2 that penetrates the cylindrical actuator body A1 and has a latch 4 at its tip, and a knob A3 that fits into the base of the key cylinder A2. This configuration makes it possible to easily configure the actuator A having a plurality of cam surfaces and cam protrusions. Furthermore, in the above embodiment, the lock case 3 is provided with a dial section 27 that restricts the movement of multiple dials D in the bar axis direction, and a spring 28 for returning the lock bar is provided between the tip of the lock bar R and the lock bar tip support portion of the lock case 3.

[0047] This configuration allows the position regulation of the dial D and the return movement of the lock bar R to be easily configured. Furthermore, in the embodiment, a case cover 30 is attached to the lock case 3, This case cover 30 is formed with an actuator hole 33 that exposes the end of actuator A, a dial window 34 that exposes dial D, and a handle portion 35 that can be hooked with the fingers, parallel to the actuator hole 33 and dial window 34.

[0048] This configuration allows the handle portion 35 to be arranged along the arrangement of the actuators A and the dials D. Furthermore, in the embodiment, a blind cover 36 is attached to the front surface of the case cover 30 so as to be able to open and close and hide the dial D exposed through the dial window 34 . This configuration allows the dial D to remain hidden. The present invention is not limited to the above-described embodiment, and the shapes, configurations, and combinations of the components can be changed.

[0049] For example, the symbol d of the dial D may be an alphabet or other symbol, the engagement protrusion Tc of the dial connecting tube T may be one or ten, and the lock protrusion 20 of the lock case 3 may be shifted to the side from the lowest position of the tube receiving portion 19. The portion of the mode changer E exposed in the recess 16 of the cam receiving wall W may be formed into a mountain shape that fits within a semicircle, and the top surface of this mountain shape may be formed into a trapezoid or arc shape to form a pushing surface Ea that can come into contact with the expanding cam protrusion 15, and the bottom side of the mountain shape may be formed flat or in a V-groove shape to form an avoidance surface Eb that avoids contact with the expanding cam protrusion 15. [Explanation of symbols]

[0050] 1 combination lock 3 tablet cases 4. Stakes 11. Blocking cam surface 12 Push cam protrusion 14 Unlocking cam surface 15 Expanding cam protrusion 16 Recess 18 Bar support 19 Tube holder 20 Locking protrusion 22 Lock groove 23-pin 24 pin holes 25 pin groove 27 Dial Section 28 Spring 30 Case Cover 33 Actuator hole 34 Dial window 35 Handle 36 Blindfold Cover A actuator 41 Locker 42 Opening and closing doors 44 Search mechanism 45 keyway 51 Mounting base 52 Cover body A1 Actuator cylinder A2 key cylinder A3 knob D-Dial Da engagement groove Db engagement protrusion E mode switch Ea Pushing surface Eb avoidance side Ed Tool engagement part F Cylinder locking means G Dial engagement means K Unlock position M Fixed mode contact surface R Lock Bar S Lock position T-dial connecting tube Ta cylinder part Tb flange Tc engaging protrusion W Cam receiving wall d sign

Claims

1. The locking device comprises a lock case (3), an actuator (A) having a latch (4) at its tip and supported by the lock case (3) for rotating the latch (4) from an unlocked position (K) to a locked position (S), a lock bar (R) disposed perpendicular to the actuator (A) and supported on the lock case (3) so as to be movable in the axial direction, a plurality of dial connecting tubes (T) fitted to the lock bar (R) so as to be integrally movable and rotatable, and a dial (D) fitted to each dial connecting tube (T) and having a plurality of symbols (d) on its outer periphery, Between the dial connecting tube (T) and the lock case (3), a tube locking means (F) is provided which restricts movement of the dial connecting tube (T) in the bar axial direction and allows movement by aligning the dial connecting tube (T) at one position in the circumferential direction. Between the dial connecting tube (T) and the dial (D), a dial engaging means (G) is provided, which can change the fitting position of the dial (D) relative to the dial connecting tube (T) by the number of symbols (d) and can be engaged and disengaged by moving the dial connecting tube (T) in the bar axial direction, A cam receiving wall (W) is provided on the base end side of the lock bar (R), and the actuator (A) is formed with a blocking cam surface (11) that abuts against the cam receiving wall (W) to prevent the actuator (A) from rotating when the actuator (A) is in the locked position (S), and a pushing cam protrusion (12) that pushes the lock bar (R) when the actuator (A) rotates. The actuator (A) is formed with an unlocking cam surface (14) adjacent to the pushing cam protrusion (12) and abutting against the cam receiving wall (W) when in the unlocking position (K), and an enlarged cam protrusion (15) adjacent to the unlocking cam surface (14) at an extension position of the pushing cam protrusion (12), A dial lock characterized in that the cam receiving wall (W) is formed with a fixed mode abutment surface (M) that abuts against the blocking cam surface (11), pushing cam protrusion (12) and unlocking cam surface (14) of the actuator (A), and a recess (16) that avoids abutment with the expanding cam protrusion (15), and a mode switching device (E) is provided that protrudes retractably into this recess (16) and pushes the lock bar (R) until it abuts against the expanding cam protrusion (15) and releases the dial engagement means (G) between the dial connecting tube (T) and the dial (D).

2. The dial lock of claim 1, characterized in that the mode switching device (E) extends from a portion that protrudes into the recess (16) of the cam receiving wall (W) to an end that is exposed on the back surface of the lock case (3), and a pushing surface (Ea) that can abut against the enlarged cam protrusion (15) is formed on the portion that protrudes into the recess (16) of the cam receiving wall (W).

3. The dial lock according to claim 2, characterized in that the mode switching device (E) is formed of a cylindrical material that is parallel to the actuator (A) and can rotate, and the portion exposed to the recess (16) of the cam receiving wall (W) is formed in a semicircular shape, the semicircular arc surface serving as a pushing surface (Ea) that can come into contact with the expanding cam protrusion (15), and the semicircular flat surface is approximately parallel to the back surface of the recess (16) and serves as an avoidance surface (Eb) that avoids contact with the expanding cam protrusion (15).

4. The lock case (3) is formed with a bar receiving portion (18) that supports the lock bar (R) so that it can move in the bar axial direction, a tube receiving portion (19) that supports the dial connecting tube (T), and a lock protrusion (20) that protrudes from the tube receiving portion (19). The dial lock according to any one of claims 1 to 3, characterized in that the dial connecting tube (T) is formed with a tube portion (Ta) that fits into the lock bar (R), a flange portion (Tb) that protrudes from the tube portion (Ta) at one end of the tube portion (Ta) and can be received in the tube receiving portion (19), an engagement protrusion (Tc) that protrudes from the outer periphery of the tube portion (Ta) adjacent to the flange portion (Tb) and constitutes a dial engagement means (G), and one lock groove (22) that is formed concavely in the flange portion (Tb) and constitutes a tube lock means (F).

5. The lock case (3) has a pin hole (24) formed in the barrel receiving portion (19) into which a pin (23) can be inserted from the back surface of the lock case (3), A dial lock as described in claim 4, characterized in that a pin groove (25) in which the pin (23) can engage is formed at a position circumferentially coincident with the lock groove (22) in the tubular portion (Ta) of the dial connecting tube (T).

6. The dial lock of any one of claims 1 to 5, characterized in that the actuator (A) has an actuator cylindrical body (A1) having a blocking cam surface (11), a pushing cam protrusion (12), an unlocking cam surface (14), and an expanding cam protrusion (15) formed on its outer periphery, a key cylinder (A2) that is passed through the actuator cylindrical body (A1) and has a latch (4) at its tip, and a knob (A3) that is fitted to the base of the key cylinder (A2).

7. A dial lock as described in any one of claims 1 to 6, characterized in that the lock case (3) is provided with a dial section (27) that restricts the movement of multiple dials (D) in the bar axis direction, and a spring (28) for returning the lock bar is provided between the tip of the lock bar (R) and the lock bar tip support portion of the lock case (3).

8. A case cover (30) is attached to the lock case (3), A dial lock as described in any one of claims 1 to 7, characterized in that the case cover (30) is formed with an actuator hole (33) that exposes the end of the actuator (A), a dial window (34) that exposes the dial (D), and a handle portion (35) that can be hooked with the fingers, parallel to the actuator hole (33) and the dial window (34).

9. The dial lock according to claim 8, characterized in that a blind cover (36) is attached to the surface side of the case cover (30) to freely open and close and hide the dial (D) exposed from the dial window (34).

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