Crescent Tablets

Abstract

This provides a thin, slim dial-type crescent lock that allows you to change the PIN without using any operating tools. [Solution] The crescent lock 1 includes an unlocking restricting member 9 that restricts the unlocking operation of a rotatably mounted crescent, a locking member 15 that is linked to the sliding of the unlocking restricting member 9, and a dial lock 10 equipped with multiple operating dials. When the locking member 15 is in the upper limit dial operation restricting position, the locking member 15 prevents the rotation of the operating dials 11 and 12, keeping the dial lock 10 in a locked state. The dial lock 10 is configured so that the PIN can be changed without using a pin-shaped operating tool, and the PIN can only be changed to a different number when the code change knob 18 is grasped and the lock release code change member 17 is moved to a predetermined position.

Description

Technical Field

[0001] The present invention relates to a crescent lock.

Background Art

[0002] A crescent lock is known as a locking device for maintaining the closed state of fittings such as sliding windows arranged at building openings. Patent Document 1 discloses a conventional crescent lock.

[0003] The crescent lock of Patent Document 1 has a button lock part provided with an operation button at the upper part, and also has a rotatable crescent at the lower part. With this crescent lock, the crescent lock cannot be unlocked unless the password information set in the button lock part is input. The button lock part plays a role in effectively preventing unauthorized unlocking of the crescent lock.

[0004] However, since the crescent lock of Patent Document 1 has a large thickness of the button lock part, when the crescent lock is installed on a window frame or a door frame, it protrudes, which not only affects the view from the inside of the building, but may also damage the consistency of the appearance and aesthetic elements. Therefore, there is a demand to slim down the crescent lock without impairing the function of preventing unauthorized unlocking of the password-based crescent lock.

[0005] In addition, with the crescent lock of Patent Document 1, the password information is changed using a pin-shaped operating tool that is inserted into the button lock part. Such an operating tool may be lost and there is also a risk of accidental ingestion, so a new structure that allows the password information to be changed without using the operating tool is demanded.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0007] Therefore, in view of the problems of the prior art described above, the object of this invention is to provide a thin and slim crescent lock equipped with a function to prevent unauthorized unlocking. Another object of this invention is to provide a crescent lock with a function to prevent unauthorized unlocking that allows the password information to be changed without using an operating tool. [Means for solving the problem]

[0008] The above objective is achieved by a crescent lock comprising: a rotatably mounted crescent; an unlocking restricting member that is movable between an unlocking restricting position that restricts the unlocking operation of the crescent and an unlockable position that allows the unlocking operation of the crescent; and an operating dial for unlocking, wherein the dial lock holds the unlocking restricting member in the unlocking restricting position when locked and allows the unlocking restricting member to move to the unlockable position when unlocked, and the operating dial is positioned such that its rotating surface is substantially parallel to the mounting surface of the crescent lock.

[0009] In the above-described crescent lock, multiple operating dials are provided, and these multiple operating dials are located on different axes of rotation, and each is positioned to be substantially parallel to the mounting surface of the crescent lock.

[0010] Furthermore, the crescent lock has a locking member that is movable between a dial operation restricting position that prevents the rotation of the operating dial and holds the dial lock in an unlocked state, and a dial operation allowing position that allows the rotation of the operating dial, and is provided to be linked to the operation of the unlocking restricting member.

[0011] Furthermore, in the crescent lock described above, the operating dial has a code setting cam having an engagement groove into which an engaging piece protruding from the locking member can enter, and a dial portion that releasably engages with the code setting cam and rotates integrally with the code setting cam.

[0012] Furthermore, in the crescent lock described above, the locking member has an insertion hole through which the code setting cam can be inserted, and the locking member is provided to be movable between the dial operation restricting position and the dial operation permitting position with the code setting cam protruding through the insertion hole.

[0013] Furthermore, in the crescent lock described above, the operating dial is marked with multiple codes, including a code for unlocking. The dial lock is configured so that the code for unlocking can be changed to a different code.

[0014] Furthermore, the crescent lock also has a lock release code changing member that is operated when changing the lock release code to a different code, and the lock release code of the dial lock can be changed to a different code only when this lock release code changing member is moved to a predetermined position. [Effects of the Invention]

[0015] The crescent lock of the present invention has an operating dial positioned almost parallel to the mounting surface of the crescent lock, which allows for a slimmer design compared to conventional crescent locks that use a keypad entry system. In other words, the parallel arrangement of the operating dial minimizes the thickness of the crescent lock, so it does not obstruct the view from inside the building and does not detract from the aesthetics of the windows or doors.

[0016] Furthermore, when a dial lock is equipped with multiple operating dials, these dials are positioned on different axes of rotation and are arranged to be approximately parallel to the mounting surface of the crescent lock. Therefore, even when a crescent lock is equipped with multiple operating dials, it is possible to make the crescent lock slimmer.

[0017] Furthermore, in this invention, the locking member operates in conjunction with the operation of the unlocking restriction member. This interlocking mechanism allows the crescent lock to be unlocked only when the operating dial is set to the unlocked position. This function effectively prevents unauthorized unlocking of the crescent lock and improves security.

[0018] Furthermore, in this invention, the operating dial and the locking member work in conjunction, and the dial lock can only be unlocked and the crescent lock unlocked when the code setting cam is positioned in a predetermined location. This prevents accidental operation and unauthorized unlocking, thereby improving security.

[0019] Furthermore, in this invention, the code setting cam protrudes through the insertion hole and functions as a guide when the locking member moves. This guiding function allows the locking member, which is linked to the unlocking restriction member, to move smoothly between the dial operation restriction position and the dial operation permitting position. In addition, since the engaging piece of the locking member can smoothly enter and exit the engaging groove of the code setting cam, the locking and unlocking of the crescent lock can be performed smoothly and without hindrance.

[0020] Furthermore, this invention allows the unlocking code set for the dial lock to be changed to a different code (a code of the user's choosing). This function improves convenience by allowing the user to select a code based on their preference or memory.

[0021] Furthermore, in this invention, the unlock code can only be changed when the unlock code changing member is moved to a predetermined position. Because the unlock code can only be changed when certain conditions are met, unauthorized changes can be prevented, improving security. Also, since the operation to change the unlock code is simple, requiring only the movement of the unlock code changing member, the unlock code change operation is easy. Moreover, since the unlock code change operation can be performed without using pin-shaped operating tools, which are considered essential in conventional technology, there is no risk of losing or accidentally ingesting operating tools. [Brief explanation of the drawing]

[0022] [Figure 1] These are a plan view, a side view, and a rear view showing an example of the crescent lock of the present invention. [Figure 2] Figure 1 is an exploded perspective view showing the main parts of the Crescent tablet. [Figure 3] It is a cross-sectional view showing the main part of the crescent-shaped lock of FIG. 1. The illustration of the crescent is omitted. [Figure 4] It is a cross-sectional view showing the disassembled state of the crescent-shaped lock shown in FIG. 3. [Figure 5] They are a plan view and a side view showing the crescent-shaped lock body. [Figure 6] It is a cross-sectional view showing the state before and after the slide of the lock member interlocked with the unlocking regulation member. [Figure 7] It is a plan view showing the state before and after the slide of the lock member interlocked with the unlocking regulation member. [Figure 8] FIG. 8(A) is a side view, a plan view, and a cross-sectional view showing the operation dial. FIG. 8(B) is a side view, a plan view, and a cross-sectional view showing the code setting cam constituting a part of the operation dial. FIG. 8(C) is a side view, a bottom view, and a cross-sectional view showing the dial part constituting a part of the operation dial. [Figure 9] FIG. 9(A) is a plan view showing the dial spring arranged on the crescent-shaped lock body. FIG. 9(B) is a plan view showing the engagement relationship between the dial spring and the operation dial in the crescent-shaped lock body. [Figure 10] It is a cross-sectional view showing the operations of the unlocking code changing member and the code setting cam when changing the unlocking code.

Embodiments for Carrying Out the Invention

[0023] (Configuration of the Crescent-Shaped Lock) First, based on the attached drawings, the configuration of the crescent-shaped lock of this embodiment will be described.

[0024] The crescent-shaped lock 1 of this embodiment is a locking device for fittings such as a sliding window, and mainly includes a crescent-shaped lock mechanism provided at the lower part of the crescent-shaped lock and a dial lock mechanism provided at the upper part of the crescent-shaped lock.

[0025] The crescent lock mechanism includes a crescent 5 (see Figures 1 and 2) and a sliding plate-shaped unlocking restricting member 9 (see Figure 2) that can restrict the unlocking operation of the crescent 5. The unlocking operation of the crescent means rotating the crescent 5, which is in the locked state, in the unlocking direction.

[0026] As shown in Figure 2, the dial lock mechanism includes a dial lock 10 equipped with dials 81, 82, etc., a lock knob 33 for raising and lowering the unlocking restricting member 9, a plate-shaped lock member 15 that is linked to the up and down sliding of the unlocking restricting member 9, a plate-shaped unlocking code changing member 17 for changing the unlocking code of the dial lock 10, a back plate 23 attached to the crescent lock body 21 that houses these members, and screws 25 for fixing the back plate 23 to the crescent lock body 21.

[0027] As shown in Figure 1, the crescent 5 has an operating knob 7 for rotating the crescent, similar to the prior art, and also has a rotating shaft that rotates integrally with the crescent within the crescent lock body 21. The rotating shaft of the crescent 5 is not shown in Figure 2.

[0028] The crescent 5 is rotatably mounted on the crescent lock body 21. As shown in Figures 2 and 3, the crescent lock body 21 is formed in a roughly box-like shape that is elongated vertically and is fixed to the mounting surface of the crescent lock (the surface of the inner meeting stile of the door). The crescent lock body 21 is a case that houses the components of the lock, including the unlocking restriction member 9. The crescent lock body 21 rotatably supports the rotation axis of the crescent 5. The rotation axis of the crescent 5 is provided with a stopper that can contact the lower end of the unlocking restriction member 9.

[0029] The crescent lock 5 is rotatably mounted on the crescent lock body 21 between a "locked position" in which it is engaged with the crescent receiver and an "unlocked position" in which it is disengaged from the crescent receiver. The crescent receiver is fixed to the outer meeting stile of the door or window.

[0030] The unlocking restriction member 9 is provided so as to be slidable vertically between the "unlocking restriction position" and the "unlockable position". When the unlocking restriction member 9 is in the lower limit "unlocking restriction position", the lower end of the unlocking restriction member 9 contacts a stopper provided on the rotation axis of the crescent 5, restricting the unlocking operation of the locked crescent 5. When the unlocking restriction member 9 is in the upper limit "unlockable position", the lower end of the unlocking restriction member 9 is separated from the stopper provided on the rotation axis of the crescent 5, allowing the unlocking operation of the locked crescent 5.

[0031] As shown in Figures 3 and 4, a locking member 15, which will be described later, is connected to the unlocking restricting member 9. When the unlocking restricting member 9 slides vertically, the locking member 15 also slides vertically in conjunction with it. The unlocking restricting member 9 has a connecting portion 8 for connecting to the locking member 15. The connecting portion 8 of the unlocking restricting member 9 is formed by bending the upper end portion of the unlocking restricting member into a roughly L-shape.

[0032] A lock knob 33 is connected to an unlocking restriction member 9, which is slidably mounted within the crescent lock body 21. As shown in Figures 1 and 2, the lock knob 33 is mounted outside the crescent lock body 21 and is slidable vertically along the outer wall of the body. By grasping and raising or lowering the lock knob 33, the unlocking restriction member 9 inside the crescent lock body 21 slides vertically in conjunction with it.

[0033] The dial lock 10 is equipped with two rotatable operating dials 11 and 12 for unlocking. In this embodiment, two operating dials 11 and 12 are provided, but the number of operating dials is not particularly limited and may be one, three or more.

[0034] When the dial lock 10 is in the "locked state," the unlocking restricting member 9 is prevented from sliding upward toward the unlockable position, holding the unlocking restricting member 9 in the lower limit of the unlocking restricting position. Therefore, in this state, the crescent 5 cannot be rotated in the unlocking direction. On the other hand, when the dial lock is in the "unlocked state," the unlocking restricting member 9 is allowed to slide upward toward the unlockable position. Therefore, in this state, the crescent 5 can be rotated in the unlocking direction.

[0035] The operating dials 11 and 12 are positioned within the crescent lock body 21 such that their surfaces of rotation are approximately parallel to the mounting surface of the crescent lock 1 (the surface of the inner meeting stile). Here, "parallel" means that, assuming the operating dials 11 and 12 are flat discs, their surfaces of rotation are parallel to the mounting surface of the crescent lock 1 (the surface of the inner meeting stile). In other words, the operating dials 11 and 12 are positioned such that their axes of rotation 41 and 42 are approximately perpendicular to the mounting surface of the crescent lock 1.

[0036] As shown in Figure 5, the crescent lock body 21 has rotating shafts 41 and 42 that rotatably support the operating dials 11 and 12, and recesses 43 and 44 in which the operating dials 11 and 12 are positioned. The rotating shafts 41 and 42 are located in the center of the recesses 43 and 44. Thus, in this embodiment, the two operating dials 11 and 12 are provided on different rotating shafts 41 and 42, and the rotating shafts are not coaxial.

[0037] The locking member 15 is a plate-shaped member provided to slide in conjunction with the unlocking restricting member 9. This locking member 15 is provided to slide vertically between the "dial operation restricting position" shown in Figures 6 and 7(A) and the "dial operation permitted position" shown in Figures 6 and 7(B). When the locking member 15 is in the upper limit "dial operation restricting position", the locking member 15 prevents the rotation of the operating dials 11 and 12. When the locking member 15 is in the lower limit "dial operation permitted position", the restraint on the operating dials 11 and 12 is released, and the operating dials 11 and 12 can be rotated.

[0038] As shown in Figure 6, the aforementioned unlocking restriction member 9 is connected to the locking member 15. When the unlocking restriction member 9 slides vertically, the locking member 15 also slides vertically in conjunction with it. The locking member 15 has a connecting portion 14 for connecting to the unlocking restriction member 9 located below it. The connecting portion 14 of the locking member 15 is formed by bending the lower end portion of the locking member 15 into a roughly U-shape. The unlocking restriction member 9 and the locking member 15 are connected via the connecting portions 8 and 14, causing them to slide in conjunction with each other.

[0039] As shown in Figures 2 and 7, the locking member 15 has through holes 61 and 62 through which the code setting cams 71 and 72 of the operating dial 10, which will be described later, can be inserted. As shown in Figure 6, the locking member 15 is provided so as to cover the dial portions 81 and 82 of the operating dials 11 and 12 with the code setting cams 71 and 72 protruding from the through holes 61 and 62. The through holes 61 and 62 of the locking member 15 function as guide holes that guide the locking member 15 in a predetermined direction when it slides in conjunction with the unlocking restricting member 9. As shown in Figures 6 and 7, the locking member 15 slides between the dial operation restricting position and the dial operation permitted position with the code setting cams 71 and 72 protruding through the through holes 61 and 62.

[0040] Furthermore, as shown in Figure 2, the locking member 15 is provided with engaging pieces 63 and 64 that can enter the engaging grooves 91 and 92 of the reference setting cams 71 and 72, and these engaging pieces 63 and 64 protrude toward the insertion holes 61 and 62.

[0041] As shown in Figures 4 and 8, the operating dials 11 and 12 have a code setting cam 71 and 72 having engagement grooves 91 and 92, and a dial portion 81 and 82 that rotates integrally with the code setting cam 71 and 72.

[0042] The dial portions 81 and 82 are positioned in recesses 43 and 44 within the crescent lock body 21, integrated with the code setting cams 71 and 72 by engaging with them. The dial portions 81 and 82 are formed in an annular shape and have fitting holes 83 and 84 on their inside for fitting the code setting cams 71 and 72, and internal teeth 85 and 86 that can engage with the external teeth 93 and 94 of the code setting cams 71 and 72. The dial portions 81 and 82 are releasably engaged with the code setting cams 71 and 72 and rotate together with the code setting cams.

[0043] The code setting cams 71 and 72 have bearing holes 75 and 76 for inserting the rotating shafts 41 and 42 that protrude from the crescent lock body 21, projections 77 and 78 that protrude upward through fitting holes 83 and 84 of the dial parts 81 and 82, engagement grooves 91 and 92 formed at predetermined positions on the projections 77 and 78, and external teeth 93 and 94 that can mesh with the internal teeth 85 and 86 of the dial parts 81 and 82. Engaging pieces 63 and 64 that protrude from the locking member 15 can enter the engagement grooves 91 and 92 of the code setting cams 71 and 72.

[0044] When the operating dials 11 and 12 of the above configuration are positioned in the recesses 43 and 44 of the crescent lock body 21, the dial portions 81 and 82 are supported by the stepped portions 45 and 46 of the crescent lock body 21. The symbol setting cams 71 and 72 are supported by cam springs 95 and 96, which will be described later, with the rotating shafts 41 and 42 inserted into the bearing holes 75 and 76.

[0045] As shown in Figures 10(A) and 10(B), when the operating dials 11 and 12 located on the crescent lock body 21 are pushed toward the cam springs 95 and 96, the dial parts 81 and 82 catch on the stepped parts 45 and 46, causing only the code setting cams 71 and 72 to move laterally, accompanied by the elastic deformation of the cam springs 95 and 96. When the code setting cams 71 and 72, which have been pushed laterally, separate from the dial parts 81 and 82, the engagement between them is released, making it possible to rotate the dial parts 81 and 82 relative to the code setting cams 71 and 72.

[0046] As shown in Figure 8, multiple codes, including an unlock code (password information), are marked around the dial portions 81 and 82 at equal intervals. Furthermore, the dial portions 81 and 82 are rotatable so that at least a portion of the multiple codes are exposed. In this embodiment, as an example of the codes, the numbers 0 through 9 are marked around the dial portions at equal intervals.

[0047] When the operating dials 11 and 12 are rotated and the unlock code is positioned in a predetermined location, the dial lock 10 is released. In this embodiment, any code selected by the user from among the multiple codes attached around the dial parts 81 and 82 can be set as the unlock code.

[0048] As shown in Figures 1 and 5, the crescent lock of this embodiment is equipped with unlocking marks 27 and 28, which serve as markers for aligning the unlocking symbols. By rotating the operating dials 11 and 12 and aligning the unlocking symbols on the dial sections 81 and 82 with the unlocking marks 27 and 28, the dial lock 10 is released.

[0049] When the operating dials 11 and 12 are rotated to align the unlock symbols with the predetermined positions (unlock marks 27 and 28), the engagement grooves 91 and 92 of the symbol setting cams 71 and 72, which rotate integrally with the dial parts 81 and 82, are positioned in the predetermined positions, and the dial lock 10 reaches the unlocked state. In this state, as shown in Figure 7(B), the engagement grooves 91 and 92 of the symbol setting cams 71 and 72 face the engagement pieces 63 and 64 of the locking member 15, so that the engagement pieces 63 and 64 of the locking member 15 can enter the engagement grooves 91 and 92 of the symbol setting cams 71 and 72, and the locking member 15, which is linked to the unlocking restricting member 9, can slide toward the dial operation restricting position.

[0050] Furthermore, the crescent lock 1 is provided with a dial spring 35 to produce a clicking sensation during rotation. As shown in Figure 9, the dial spring 35 is positioned so that its tip contacts the dial parts 81 and 82, and plays the role of producing a clicking sensation each time the operating dials 11 and 12 are rotated by a predetermined angle. The dial spring 35 is attached to a fitting shaft 36 that protrudes from the crescent lock body 21. The outer circumference of the dial parts 81 and 82 has a continuous pattern of bumps and grooves that contact the dial spring during rotation to produce a clicking sensation.

[0051] Furthermore, the crescent lock 1 includes, as shown in Figure 2, a plate-shaped unlock code changing member 17 that is operated when changing the unlock code, cam springs 95 and 96 for biasing the code setting cams 71 and 72, and a code changing knob 18 for moving the unlock code changing member 17 in a direction that presses the code setting cams 71 and 72.

[0052] As shown in Figure 10(A), the cam springs 95 and 96 bias the code setting cams 71 and 72 toward the dial portions 81 and 82. As a result, the engagement state between the dial portions 81 and 82 of the operating dials 11 and 12 located in the recesses 43 and 44 and the code setting cams 71 and 72 is maintained. The cam springs 95 and 96 are attached to the rotating shafts 41 and 42 that support the operating dials 11 and 12, and are located in the spring spaces 97 and 98 around the base of the rotating shafts. The spring spaces 97 and 98 are recesses formed in the center of the recesses 43 and 44.

[0053] As shown in Figure 10(B), the unlock code changing member 17 is a member that pushes the code setting cams 71 and 72 axially against the biasing force of the cam springs 95 and 96 so that the engagement between the dial portions 81 and 82 and the code setting cams 71 and 72 is released. The unlock code changing member 17 is provided on top of the locking member 15 so that it can press the upper ends of the code setting cams 71 and 72 that protrude from the insertion holes 61 and 62 of the locking member 15.

[0054] The unlock code changing member 17 is provided so as to be movable between the "code change restricted position" shown in Figure 10(A) and the "code changeable position" shown in Figure 10(B). When the unlock code changing member 17 is in the "code change restricted position" near the meeting frame, the unlock code cannot be changed. When the unlock code changing member 17 is pushed in to the "code changeable position", the unlock code can be changed to another code selected by the user. Therefore, in this embodiment, the code for unlocking the dial lock 10 can only be changed to a different code when the unlock code changing member 17 is moved to a predetermined position (code changeable position).

[0055] As shown in Figure 2, the unlock code changing member 17 has a guide hole 16 so that when the push operation is performed, the unlock code changing member 17 moves toward the code changeable position. A fitting shaft 36 protruding from the crescent lock body 21 is inserted through the guide hole 16, and the unlock code changing member 17 moves up and down along this fitting shaft 36.

[0056] To change the unlock code to another code selected by the user, the code change knob 18 is grasped and the unlock code change member 17 is pushed against the biasing force of the cam springs 95 and 96, as shown in Figure 10(B), thereby releasing the engagement between the dial parts 81 and 82 and the code setting cams 71 and 72. Then, by rotating the dial parts 81 and 82 in this state, the relative position of the codes on the dial parts 81 and 82 and the engagement grooves 91 and 92 on the code setting cams 71 and 72 is changed.

[0057] The code change knob 18 is attached to the unlock code change member 17 as shown in Figure 2, and is also provided to protrude from the crescent lock body 21 as shown in Figure 1.

[0058] (The action taken when locking the crescent lock and then locking the dial lock) When the crescent 5 is rotated from the unlocked position to the locked position and engaged with the crescent receiver, the crescent 5 enters the locked state. Next, the lock knob 33 is pushed down to slide the unlocking restricting member 9 from the unlockable position to the unlocking restricting position. When the unlocking restricting member 9 reaches the unlocking restricting position, the lower end of the unlocking restricting member 9 comes into contact with a stopper provided on the rotation axis of the crescent 5, so the rotational movement of the rotation axis of the crescent 5 is prevented by the unlocking restricting member 9. Therefore, unless the unlocking restricting member 9 is returned to the unlockable position, the unlocking movement of the crescent 5 (rotation of the crescent 5 in the unlocking direction) is prevented by the unlocking restricting member 9.

[0059] When the lock knob 33 is pressed down, the unlocking restricting member 9 slides from the unlockable position to the unlocking restricted position. In conjunction with this movement, the locking member 15 slides from the dial operation restricted position (Figures 6 and 7(A)) to the dial operation permitted position (Figures 6 and 7(B)). At this time, the code setting cams 71 and 72 protrude from the insertion holes 61 and 62 of the locking member 15, and the locking member 15 is guided toward the dial operation permitted position by the insertion holes 61 and 62.

[0060] When the locking member 15 reaches the dial operation allowable position as shown in Figures 6 and 7(B), the engaging pieces 63 and 64 of the locking member 15 disengage from the engaging grooves 91 and 92 of the reference setting cams 71 and 72, which are part of the operating dials 11 and 12. This releases the restraint imposed by the locking member 15, allowing the operating dials 11 and 12 to rotate freely.

[0061] Next, for security purposes, the operating dials 11 and 12 are rotated to align a code different from the unlock code with the unlock indicators 27 and 28. This causes the engagement grooves 91 and 92 of the code setting cams 71 and 72, which rotate integrally with the dial sections 81 and 82, to disengage from their predetermined positions (the unlocking position where the engagement grooves 91 and 92 of the code setting cams 71 and 72 face the engagement pieces 63 and 64 of the locking member 15). This prevents the engagement pieces 63 and 64 of the locking member 15 from entering the engagement grooves 91 and 92 of the code setting cams 71 and 72, making it impossible to push the unlocking restricting member 9 back to the unlockable position. As a result, the rotation of the crescent 5 is prevented by the unlocking restricting member 9 until the unlock code on the operating dials 11 and 12 is aligned with the unlock indicators 27 and 28 again, pushing the unlocking restricting member 9 back to the unlockable position.

[0062] As a result of the above operations, the crescent lock 1 is locked, and the locked state is further secured by the dial lock 10 to prevent unauthorized unlocking.

[0063] (The action taken when unlocking the dial lock and then unlocking the crescent lock) Rotate the operating dials 11 and 12 to align the unlock symbols on the operating dials 11 and 12 with the unlock marks 27 and 28. As a result, as shown in Figure 7(B), the engagement grooves 91 and 92 of the symbol setting cams 71 and 72, which rotate integrally with the dial sections 81 and 82, are positioned in a predetermined position (the unlocking position where the engagement grooves 91 and 92 of the symbol setting cams 71 and 72 face the engagement pieces 63 and 64 of the locking member 15), allowing the engagement pieces 63 and 64 of the locking member 15 to enter the engagement grooves 91 and 92 of the symbol setting cams 71 and 72.

[0064] Next, the lock knob 33 is pushed up, sliding the unlocking restricting member 9 from the unlocking restricting position to the unlockable position. When the unlocking restricting member 9 reaches the unlockable position, it separates from the rotation axis of the crescent 5, allowing the crescent 5 to be unlocked (rotated in the unlocking direction). Subsequently, the crescent 5 is rotated from the locked position to the unlocked position and removed from the crescent receiver, resulting in the unlocked state.

[0065] When the lock knob 33 is pushed up and the unlocking restricting member 9 is slid from the unlocking restricting position to the unlocking enabled position, the locking member 15 slides in conjunction with this movement, as shown in Figure 7(A), from the dial operation permitted position to the dial operation restricted position. At this time, the code setting cams 71 and 72 protrude from the insertion holes 61 and 62 of the locking member 15, so the locking member 15 is guided toward the dial operation restricted position by the insertion holes 61 and 62, and the engaging pieces 63 and 64 of the locking member 15 enter the engaging grooves 91 and 92 of the code setting cams 71 and 72.

[0066] As a result of the above operations, the dial lock 10 is released and the crescent lock 1 is unlocked.

[0067] (Action taken when changing the unlock code) The operation to change the unlock code to another code selected by the user is performed when the crescent 5 is unlocked and the locking member 15 is in the dial operation restricting position (Figures 6 and 7(A)). At this time, the engaging pieces 63 and 64 of the locking member 15 are engaged in the engaging grooves 91 and 92 of the code setting cams 71 and 72 of the operating dials 11 and 12, preventing the rotation of the operating dials 11 and 12.

[0068] When changing the unlock code to another code selected by the user, the unlock code changing member 17 is moved from the "code change restricted position" shown in Figure 10(A) to the "code changeable position" shown in Figure 10(B). That is, the code change knob 18 is grasped and slid to move the unlock code changing member 17 (in the direction that pushes the code setting cams 71 and 72 toward the spring spaces 97 and 98) as shown in Figure 10(B). At this time, the code setting cams 71 and 72, which protrude directly to the side of the unlock code changing member 17, are pushed in together with the unlock code changing member 17 against the biasing force of the cam springs 95 and 96.

[0069] As a result, the dial portions 81 and 82 catch on the stepped portions 45 and 46, causing only the code setting cams 71 and 72 to move toward the spring spaces 97 and 98, accompanied by the elastic deformation of the cam springs 95 and 96. In other words, the code setting cams 71 and 72 are pushed into the spring spaces 97 and 98, leaving the dial portions 81 and 82 behind. Consequently, the external teeth 93 and 94 of the code setting cams 71 and 72 separate from the internal teeth 85 and 86 of the dial portions 81 and 82, and the engagement between them is released.

[0070] On the other hand, since the engaging pieces 63 and 64 of the locking member 15 remain engaged in the engaging grooves 91 and 92 of the code setting cams 71 and 72 when they are in the spring spaces 97 and 98, the rotational movement of the code setting cams 71 and 72 is blocked by the engaging pieces 63 and 64 of the locking member 15. Therefore, when the lock release code changing member 17 is pushed in to release the engagement between the code setting cams 71 and 72 and the dial parts 81 and 82, it becomes possible to rotate only the dial parts 81 and 82 while the code setting cams 71 and 72 are constrained.

[0071] Next, while maintaining the state in which the unlock code changing member 17 is pressed in (the state in which the engagement between the code setting cams 71, 72 and the dial parts 81, 82 is released), the dial parts 81, 82 are rotated to align the unlock code selected by the user with the unlock marks 27, 28 on the crescent lock body.

[0072] Subsequently, when the user releases the code change knob 18, the elastically deformed cam springs 95 and 96 return to their original shape, as shown in Figure 10(A), and press the code setting cams 71 and 72 in a direction that pushes them out of the spring spaces 97 and 98. As a result, the biasing force of the cam springs 95 and 96 causes the code setting cams 71 and 72 to re-engage with the dial portions 81 and 82, and the lock release code change member 17 is pushed up by the code setting cams 71 and 72, returning to its original position (code change restriction position).

[0073] Through the above operations, the unlock code selected by the user is stored in the code setting cams 71 and 72 of the operation dials 11 and 12, and the change of the unlock code is completed. [Explanation of Symbols]

[0074] 1 Crescent Tablets 5 Crescent 7. Operation knob 8 Connecting part 9 Unlocking restriction member 10 Dial lock 11, 12 Operation dial 14 Connection part 15 Locking member 16 Guide Hall 17. Lock release code changing member 18. Code Change Knob 21 Crescent lock body 23 Backing 25 screws 27,28 Unlock indicator 33 Rock pick 35 Dial spring 36 Insertion shaft 41,42 Rotation axis 43,44 recess 45,46 Stepped section 61, 62 Through holes 63, 64 Engaging pieces 71,72 Code setting cam 75,76 Bearing holes 77,78 Protrusion 81,82 Dial section 83, 84 Fitting holes 85,86 Inner teeth 91,92 Engagement grooves 93,94 External teeth 95,96 Cam spring 97,98 spring space

Claims

1. A rotatable crescent, An unlocking restricting member is provided to be movable between an unlocking restricting position that restricts the unlocking operation of the crescent lock and an unlockable position that allows the unlocking operation of the crescent lock, It has a dial lock that includes an operating dial for unlocking, which holds the unlocking restricting member in the unlocking restricting position when locked and allows the unlocking restricting member to move to the unlockable position when unlocked, The crescent lock is characterized in that the operating dial is positioned such that its rotating surface is substantially parallel to the mounting surface of the crescent lock.

2. Multiple control dials are provided, The aforementioned multiple operating dials are provided on different axes of rotation, and each is positioned so as to be substantially parallel to the mounting surface of the crescent lock. The crescent tablet according to feature 1.

3. The locking member is movable between a dial operation restricting position that prevents the rotation of the operating dial and holds the dial lock in an unlocked state, and a dial operation allowing position that allows the rotation of the operating dial, and is provided to be linked to the operation of the unlocking restricting member. The crescent tablet according to feature 1 or 2.

4. The crescent lock according to claim 3, characterized in that the operating dial has a code setting cam having an engagement groove into which an engaging piece protruding from the locking member can enter, and a dial portion that releasably engages with the code setting cam and rotates integrally with the code setting cam.

5. The locking member has an insertion hole through which the code setting cam can be inserted, The locking member is provided so as to be movable between the dial operation restricting position and the dial operation permitting position, with the code setting cam protruding through the insertion hole. The crescent tablet according to feature 4.

6. The aforementioned operating dial is marked with multiple codes, including a code for unlocking. The aforementioned dial lock is configured such that the code for unlocking can be changed to a different code. The crescent tablet according to feature 1 or 2.

7. The crescent lock further includes a lock release code changing member that is operated when changing the code used to unlock the lock to a different code. The lock release code changing member is configured to change the code for unlocking the dial lock to a different code only when it is moved to a predetermined position. The crescent tablet according to feature 6.

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