Key box

Abstract

We provide a key box that allows for easy changing of the combination lock's PIN. [Solution] The key box 10 includes a dial lock 16 housed in a lock case 14. The dial lock 16 includes a lock bar 20 connected to a latch 18, a dial 22, a dial connecting cylinder 24 interposed between the dial 22 and the lock bar 20, a first cam member 26 located on the latch 18 side of the dial 22 and movable in an orthogonal direction perpendicular to the axial direction of the lock bar 20, a second cam member 28 located between the dial connecting cylinder 24 and the first cam member 26, and an elastic member 30 that elastically pushes the dial connecting cylinder 24 toward the latch 18. The second cam member 28 can move in the axial direction in response to the orthogonal movement of the first cam member 26, and the first cam member 26 can further move in the orthogonal direction in response to the axial movement of the lock bar 20 due to the pulling of the latch 18 and the axial movement of the second cam member 28 due to the elastic member 30.

Description

[Technical Field]

[0001] The present invention relates to a key box, and more particularly to a key box that can be attached to doorknobs, grilles, gates and the like. [Background Art]

[0002] As an example of this type of prior art, Patent Document 1 discloses a key storage box. This key storage box includes a shackle (latch), a lock body for locking and unlocking the shackle, and a key storage case whose opening is closed by a side surface of the lock body. The key storage case is pivotally attached to the lower end of the lock body so as to be openable and closable, and when the opening of the key storage case is closed by the side surface of the lock body, the short leg portion of the shackle is fitted into the recess provided in the upper plate portion of the key storage case when locked. [Prior Art Documents] [Patent Documents]

[0003] [Patent Document 1] Utility Model Registration No. 3150784 Publication [Summary of the Invention] [Problem to be Solved by the Invention]

[0004] In the key storage box disclosed in Patent Document 1, locking and unlocking the shackle simultaneously enables opening and closing the key storage portion, so that keys and small items can be easily stored and taken out. However, there is no description regarding enabling the PIN code of the lock to be easily changed.

[0005] Therefore, a main object of the present invention is to provide a key box in which the PIN code of a combination lock can be easily changed. [Means for Solving the Problem]

[0006] To achieve the above objective, the device comprises a box body having an opening on one side, a lock case pivotably attached to the box body to open and close the opening, a dial lock housed in the lock case and capable of changing the combination, and a U-shaped latch having a first end that passes through the lock case and connects to the dial lock, and a second end that can be extended and retracted from the box body when the opening is closed by pivoting the lock case relative to the box body. The dial lock comprises a lock bar connected to the first end of the latch, a ring-shaped dial that passes through the lock bar and has a portion of its outer surface exposed from the lock case so as to be accessible from the outside, and a lock that fits onto the lock bar and connects the dial and the lock bar. A key box is provided, comprising: a dial connecting cylinder interposed between the dial and the lock bar; a first cam member that passes through the lock bar so as to be located on the latch side of the dial and is movable in an orthogonal direction perpendicular to the axial direction of the lock bar by pressing from outside the lock case; a second cam member fitted onto the lock bar between the dial connecting cylinder and the first cam member; and an elastic member that elastically pushes the dial connecting cylinder toward the latch side, wherein the second cam member is configured to be movable in the axial direction in accordance with the orthogonal movement of the first cam member, and the first cam member is further configured to be movable in an orthogonal direction in accordance with the axial movement of the lock bar due to the pulling of the latch and the axial movement of the second cam member due to the elastic member.

[0007] In this invention, the combination of the dial lock on the key box is changed as follows. First, the lock case is swung against the box body to close the opening of the box body with the lock case, and the lock case and the box body are connected by a U-shaped latch so that they cannot be opened. That is, the first end of the latch is inserted through the lock case and connected to the dial lock, and the second end of the latch is inserted into the box body. With this state, the dial is turned to set the dial lock to the current combination. Then, the lock bar and the dial connecting cylinder become movable in the axial direction relative to the dial. When the first cam member is pushed from outside the lock case in a direction perpendicular to the axial direction of the lock bar, the first cam member moves in that perpendicular direction, and accordingly, the second cam member and thus the dial connecting cylinder move in the axial direction away from the latch. As a result, the connection between the dial and the dial connecting cylinder is released, the dial can be rotated without rotating the dial connecting cylinder, and the combination can be changed to the desired number. After the PIN is changed to the desired number by turning the dial from outside the lock case, pulling the latch causes the lock bar to move axially toward the latch, moving the first cam member back to its original position in that orthogonal direction. Then, the elastic member springs the dial connecting cylinder toward the latch, causing the dial connecting cylinder and the second cam member to move axially toward the latch. The second cam member then causes the first cam member to move further in that orthogonal direction back to its original position, and the dial and the dial connecting cylinder are connected. This completes the PIN change. In this way, the PIN can be changed easily.

[0008] Preferably, the first cam member has a first inclined surface and a second inclined surface, the second cam member has a third inclined surface that can make surface contact with the first inclined surface, and the lock bar has a fourth inclined surface that can make surface contact with the second inclined surface. In this case, the second cam member is easily moved axially in response to the movement of the first cam member in the orthogonal direction by the surface contact between the first inclined surface and the third inclined surface. Furthermore, the first cam member is easily moved in the orthogonal direction in response to the axial movement of the lock bar due to the pulling of the latch by the surface contact between the second inclined surface and the fourth inclined surface, and furthermore, the first cam member is easily moved in the orthogonal direction in response to the movement of the second cam member in the axial direction by the surface contact between the first inclined surface and the third inclined surface.

[0009] Preferably, the lock case includes a window into which a dial is fitted such that a portion of the outer surface of the dial is exposed to the outside, and a hole near the window that allows the first cam member to be pressed. Changing the PIN requires pressing the first cam member from outside the lock case and turning the dial, but since the window into which the dial is fitted and the hole that allows the first cam member to be pressed are formed close together, the operation to change the PIN becomes easier. [Effects of the Invention]

[0010] This invention provides a key box in which the combination of the dial lock can be easily changed. [Brief explanation of the drawing]

[0011] [Figure 1] This is a perspective view showing a key box according to one embodiment of this invention. [Figure 2] This is a perspective view showing the lock case in the open position relative to the box body. (a) shows the case body with the lid attached, and (b) shows the case body with the lid removed. [Figure 3] This is a perspective view showing the lock case, dial lock, and latch. [Figure 4] This is a perspective view showing the lock case, dial lock, and latch. [Figure 5] This is an exploded perspective view showing the lock case, dial lock, and latch. [Figure 6] This is a perspective view showing the main components of a dial lock. [Figure 7] This is a side view showing the main components of a dial lock. [Figure 8] This figure shows the case body, dial lock, and latch before the first cam member is pushed in; (a) is a plan view, (b) is a cross-sectional view along line AA in Figure 8(a), and (c) is a cross-sectional view along line BB in Figure 8(a). [Figure 9] This figure shows the case body, dial lock, and latch with the first cam member slightly pushed in; (a) is a plan view, (b) is a cross-sectional view along line AA in Figure 9(a), and (c) is a cross-sectional view along line BB in Figure 9(a). [Figure 10] This figure shows the case body, dial lock, and latch with the first cam member further pushed in; (a) is a plan view, (b) is a cross-sectional view along line AA in Figure 10(a), and (c) is a cross-sectional view along line BB in Figure 10(a). [Figure 11] This diagram shows the case body, dial lock, and latch in a state where the latch has been slightly pulled back after changing the combination of the dial lock. (a) is a plan view, (b) is a cross-sectional view along line AA in Figure 11(a), and (c) is a cross-sectional view along line BB in Figure 11(a). [Figure 12] This diagram shows the case body, dial lock, and latch in the further pulled-out position; (a) is a plan view, (b) is a cross-sectional view along line AA in Figure 12(a), and (c) is a cross-sectional view along line BB in Figure 12(a). [Figure 13] This diagram shows the case body, dial lock, and latch in the further pulled-down position; (a) is a plan view, (b) is a cross-sectional view along line AA in Figure 13(a), and (c) is a cross-sectional view along line BB in Figure 13(a). [Figure 14] This diagram shows the case body, dial lock, and latch in the fully extended position; (a) is a plan view, (b) is a cross-sectional view along line AA in Figure 14(a), and (c) is a cross-sectional view along line BB in Figure 14(a). [Modes for carrying out the invention]

[0012] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0013] Referring to Figures 1 to 4, a key box 10 according to an embodiment of the present invention is a side-opening type, and includes a box body 12, a lock case 14, a combination lock 16, and a latch 18.

[0014] The box body 12 is formed in a housing shape with an opening 12a on one side. The lock case 14 includes a case body 14a and a lid 14b, and is pivotably mounted to the box body 12 to open and close the opening 12a. The dial lock 16 is configured to allow the combination to be changed and is housed in the lock case 14. The latch 18 is formed in a U shape with a first end 18a and a second end 18b. The first end 18a of the latch 18 is inserted through the lock case 14 and connected to the dial lock 16, and the second end 18b is configured to be able to move in and out of the box body 12 when the lock case 14 is pivoted relative to the box body 12 to close the opening 12a. More specifically, the box body 12 and the case body 14a each have through holes 12b and 14c, respectively. The first end 18a of the latch 18 is inserted through the through hole 14c of the case body 14a and connected to the dial lock 16, while the second end 18b of the latch 18 is retractable into and out of the through hole 12b of the box body 12. The case body 14a of the lock case 14 includes a pair of wall portions 14d, a plurality (four in this embodiment) of window portions 14e, and a hole 14f. The pair of wall portions 14d are formed inside the case body 14a. A lock bar 20 and a first cam member 26 (both described later) are fitted between the pair of wall portions 14d, thereby preventing the rotation of the lock bar 20 and preventing the rotation and axial movement of the first cam member 26, thereby positioning the first cam member 26. Multiple window portions 14e are formed in a slit shape and are formed parallel to each other with spacing in the longitudinal direction of the case body 14a. A dial 22 (described later) is fitted into each window portion 14e such that a portion of the outer surface of the dial 22 is exposed to the outside. A hole 14f is formed near the window portion 14e. A push button 26b (described later) of the first cam member 26 is inserted through the hole 14f from the inside of the case body 14a, and the push button 26b can be exposed to the outer surface of the case body 14a through the hole 14f. The push button 26b of the first cam member 26 exposed from the hole 14f of the case body 14a can be pressed from the outside of the case body 14a.

[0015] Referring to FIG. 5, the combination lock 16 includes a lock bar 20, a plurality of (four in this embodiment) dials 22, a plurality of (four in this embodiment) dial connecting cylinders 24, a first cam member 26, a second cam member 28, an elastic member 30, and a leaf spring 32. In this embodiment, the combination lock 16 is a 4-digit dial-type combination lock.

[0016] Referring also to FIGS. 6 and 7, the lock bar 20 includes a substantially rod-shaped bar body 20a, a connecting portion 20b provided at an end of the bar body 20a, a plurality of (four in this embodiment) grooves 20c formed at intervals in the axial direction of the bar body 20a, an inclined surface 20d formed at an end of the bar body 20a on the connecting portion 20b side, and a protrusion 20e extending axially from the end of the bar body 20a on the connecting portion 20b side. The connecting portion 20b is formed in a substantially angular shape and is connected to a first end 18a of the latch 18. Accordingly, the lock bar 20 is connected to the first end 18a of the latch 18, and is axially movable together with the latch 18 when unlocked. The inclined surface 20d is capable of surface contact with an inclined surface 26d (described later) of the first cam member 26.

[0017] The dial 22 is formed in a ring shape and is fitted onto the lock bar 20. Further, the dial 22 is fitted into a window 14e of the lock case 14 so as not to be movable axially within the lock case 14. At this time, a part of the outer peripheral surface of the dial 22 is exposed from the window 14e of the lock case 14 so that the dial 22 can be contacted from the outside. Numerals 0 to 9 (not shown) are engraved on the outer peripheral surface of the dial 22, and annular serrated projections 22a are formed on the inner peripheral surface of the dial 22 on the latch 18 side.

[0018] The dial connecting cylinder 24 is fitted onto the lock bar 20 and interposed between the dial 22 and the lock bar 20. The dial connecting cylinder 24 includes a large diameter portion 24a and a small diameter portion 24b. The large diameter portion 24a has a non-circular cross-section through hole 24c that fits into a non-circular cross-section portion (a portion other than the groove 20c) of the bar body 20a. As a result, when the positions of the bar body 20a and the through hole 24c are aligned, the bar body 20a can be fitted into the through hole 24c, and the lock bar 20 and the dial connecting cylinder 24 can move axially relative to each other. Furthermore, when the bar body 20a is fitted into the through hole 24c, if the large diameter portion 24a is positioned at a non-circular cross-section portion of the bar body 20a, the dial connecting cylinder 24 cannot rotate circumferentially relative to the lock bar 20. On the other hand, if the large diameter portion 24a is positioned at the groove 20c, the dial connecting cylinder 24 can rotate circumferentially relative to the lock bar 20.

[0019] Furthermore, multiple (four in this embodiment) locking portions 24d are formed on the outer circumferential surface of the small-diameter portion 24b of the dial connecting cylinder 24, spaced apart in the circumferential direction and extending in the axial direction. The projection 22a is locked into the locking portions 24d, causing the dial connecting cylinder 24 to rotate along with the rotation of the dial 22. In other words, the locking portions 24d prevent the dial 22 from rotating circumferentially relative to the dial connecting cylinder 24. In addition, the projection 22a is locked in the axial direction to the large-diameter portion 24a of the dial connecting cylinder 24, preventing the dial 22 from coming off the dial connecting cylinder 24.

[0020] In this embodiment, a total of four sets of such dials 22 and dial connecting cylinders 24 are arranged in series.

[0021] The first cam member 26 is inserted through the lock bar 20 so as to be located on the latch 18 side of the dial 22 and is movable in an orthogonal direction perpendicular to the axial direction of the lock bar 20 by pressure from outside the lock case 14. The first cam member 26 is formed in a substantially angular shape and includes a through hole 26a through which the lock bar 20 is inserted and a pin-shaped push button 26b. The through hole 26a is provided with a recess 26c into which the projection 20e of the lock bar 20 fits, and an inclined surface 26d located on the opposite side of the recess 26c. Furthermore, inclined surfaces 26e are provided on both sides of the through hole 26a. The through hole 26a is formed to be slightly large so that the first cam member 26 can move in an orthogonal direction perpendicular to the axial direction when it is inserted through the lock bar 20 until it contacts the connecting portion 20b. The push button 26b can be inserted into the hole 14f of the lock case 14. The protrusion 20e of the lock bar 20 fits into the recess 26c, making it easier to assemble the first cam member 26 and the lock bar 20. When the latch 18 is pulled, the inclined surface 20d of the lock bar 20 makes surface contact with the inclined surface 26d and presses against the inclined surface 26d, causing the first cam member 26 to move towards its original position. At this time, the push button 26b of the first cam member 26 moves from inside the case body 14a through the hole 14f toward the outside of the lock case 14.

[0022] The second cam member 28 is fitted onto the lock bar 20 between the dial connecting cylinder 24 and the first cam member 26. The second cam member 28 has a non-circular cross-section through hole 28a that fits into the non-circular cross-section of the bar body 20a, a recess 28b into which the projection 20e of the lock bar 20 fits, and inclined surfaces 28c formed on both sides of the through hole 28a so as to be able to make surface contact with the inclined surface 26e of the first cam member 26. As a result, when the positions of the bar body 20a and the through hole 28a are aligned, the bar body 20a can be fitted into the through hole 28a, and the lock bar 20 and the second cam member 28 can move relative to each other in the axial direction. When the bar body 20a is fitted into the through hole 28a, if the second cam member 28 is positioned at the non-circular cross-section of the bar body 20a, the second cam member 28 cannot rotate circumferentially relative to the lock bar 20. Furthermore, since the inclined surface 26e is in surface contact with the inclined surface 28c, when the first cam member 26 moves in a direction perpendicular to the axial direction of the lock bar 20, the second cam member 28 moves in the axial direction of the lock bar 20, and when the second cam member 28 moves in that axial direction, the first cam member 26 moves in that perpendicular direction. In this way, the second cam member 28 moves in the axial direction in response to the movement of the first cam member 26 in the perpendicular direction, and the first cam member 26 moves in the perpendicular direction in response to the movement of the second cam member 28 in the axial direction. In addition, by fitting the projection 20e into the recess 28b, assembly of the second cam member 28 and the lock bar 20 becomes easier.

[0023] The elastic member 30 is made of a spring and is passed through the lock bar 20 and positioned at the tip of the lock bar 20, causing the dial connecting cylinder 24 to spring toward the latch 18.

[0024] The leaf spring 32 is positioned on the dials 22 so as to hold the four dials 22 in place within the case body 14a, and the lid 14b is then placed over it. This allows the lock dial 16 to be housed in the lock case 14 without rattling and allows the dials 22 to rotate smoothly.

[0025] In this embodiment, the inclined surface 26e corresponds to the first inclined surface, the inclined surface 26d corresponds to the second inclined surface, the inclined surface 28c corresponds to the third inclined surface, and the inclined surface 20d corresponds to the fourth inclined surface.

[0026] In a key box like this 10, the PIN can be changed as follows:

[0027] First, the lock case 14 is swung against the box body 12 to close the opening 12a, and with the latch 18 pressed against the box body 12 and lock case 14, the four dials 22 are set to the initial PIN (for example, 0000). Referring to Figures 8(a) to (c), when the latch 18 is pressed in, the lock bar 20 connected to the latch 18 moves axially relative to the dial connecting cylinder 24, and the groove 20c of the lock bar 20 is positioned to face the through hole 24c of the large diameter portion 24a, allowing the dials 22 and dial connecting cylinder 24 to rotate circumferentially relative to the lock bar 20. Furthermore, the projection 22a is locked into the locking portion 24d, allowing the dial connecting cylinder 24 to rotate along with the rotation of the dials 22. Furthermore, by aligning the four dials 22 with the initial PIN, the non-circular cross-section portion of the bar body 20a can be fitted into the non-circular cross-section through hole 24c of the dial connecting cylinder 24, the circumferential positions of the lock bar 20 and the dial connecting cylinder 24 are aligned, and the lock bar 20 and the dial connecting cylinder 24 can move relative to each other in the axial direction.

[0028] Then, referring to Figures 9(a) to (c), when the push button 26b exposed from the hole 14f near the dial 22 is pressed from outside the lock case 14 with an insertion pin or the like (not shown), the push button 26b is pushed into the hole 14f, and the first cam member 26 moves in a direction perpendicular to the axial direction of the lock bar 20. At that time, the inclined surface 26e of the first cam member 26 pushes the inclined surface 28c of the second cam member 28, with which it is in surface contact, and as a result, the diamond connecting cylinder 24 moves axially together with the second cam member 28 so as to move away from the latch 18. At this time, the lock bar 20 and the dial 22 do not move.

[0029] Referring to Figures 10(a) to (c), when the push button 26b is pressed further, the dial connecting cylinder 24 moves further axially away from the latch 18 together with the second cam member 28, and surface contact between the inclined surface 26e of the first cam member 26 and the inclined surface 28c of the second cam member 28 is eliminated. At this time, the through hole 24c of the dial connecting cylinder 24 is positioned to face the non-circular portion of the cross-section of the bar body 20a of the lock bar 20 (a portion other than the groove 20c), and the dial connecting cylinder 24 becomes unable to rotate relative to the lock bar 20. Also, the projection 22a of the dial 22 is positioned to face the portion of the small diameter 24b of the dial connecting cylinder 24 where the locking portion 24d is not formed, and the connection between the dial 22 and the dial connecting cylinder 24 is released, allowing the dial 22 to rotate relative to the dial connecting cylinder 24. This allows the PIN to be changed.

[0030] Afterward, the PIN is changed to the desired number by turning dial 22. At this time, even if dial 22 is turned, the dial connecting cylinder 24 does not rotate.

[0031] Then, referring to Figures 11(a)-(c) and 12(a)-(c), the latch 18 is pulled away from the box body 12 and the lock case 14. As a result, the lock bar 20 also moves toward the latch 18 in the axial direction, and the inclined surface 20d of the lock bar 20 presses the inclined surface 26d of the first cam member 26 in surface contact, causing the first cam member 26 to move in an orthogonal direction perpendicular to the axial direction of the lock bar 20. That is, the push button 26b moves toward the outside of the lock case 14 through the hole 14f in this orthogonal direction.

[0032] Subsequently, referring to Figures 13(a) to (c), the inclined surface 26e of the first cam member 26 and the inclined surface 28c of the second cam member 28 come into surface contact, and the elastic force of the elastic member 30 causes the dial connecting cylinder 24 and the second cam member 28 to move toward the latch 18 in the axial direction of the lock bar 20, causing the inclined surface 28c to push against the inclined surface 26e.

[0033] Then, referring to Figures 14(a) to (c), the first cam member 26 moves further in the orthogonal direction, and the push button 26b moves within the hole 14f and returns to its original position, becoming exposed so that it can be pressed from the outside of the lock case 14. At this time, as the dial connecting cylinder 24 moves, the projection 22a of the dial 22 is positioned so that it can be locked into the locking portion 24d of the dial connecting cylinder 24, and the dial 22 and the dial connecting cylinder 24 are connected. As a result, the dial connecting cylinder 24 becomes rotatable together with the dial 22. In this way, the PIN is set to the changed number. After that, with the latch 18 pressed into the box body 12 and the lock case 14, the dial 22 is turned randomly and the dial lock 16 is locked.

[0034] As described above, with the key box 10, when changing the PIN for the dial lock 16, first, the lock case 14 is swung against the box body 12 to close the opening 12a of the box body 12 with the lock case 14, and the lock case 14 and the box body 12 are connected by the U-shaped latch 18 so that they cannot be opened, that is, the first end 18a of the latch 18 is inserted through the lock case 14 and connected to the dial lock 16, and the second end 18b of the latch 18 is inserted against the box body 12, and the dial 22 is turned to set the dial lock 16 to the PIN at that time. Then, the lock bar 20 and the dial connecting cylinder 24 become movable in the axial direction relative to the dial 22. When the first cam member 26 is pushed from outside the lock case 14 in a direction perpendicular to the axial direction of the lock bar 20, the first cam member 26 moves in that perpendicular direction, and accordingly, the second cam member 28 and thus the dial connecting cylinder 24 move in the axial direction away from the latch 18. This disconnects the dial 22 from the dial connecting cylinder 24, allowing the dial 22 to be rotated without rotating the dial connecting cylinder 24, and the PIN to be changed to the desired number. After the PIN has been changed to the desired number by rotating the dial 22 from outside the lock case 14, pulling the latch 18 causes the lock bar 20 to move axially toward the latch 18, causing the first cam member 26 to move toward its original position in that orthogonal direction. Then, the elastic member 30 springs the dial connecting cylinder 24 toward the latch 18, causing the dial connecting cylinder 24 and the second cam member 28 to move axially toward the latch 18, and the second cam member 28 causes the first cam member 26 to move further toward that orthogonal direction and return to its original position, while the dial 22 and the dial connecting cylinder 24 are connected. This completes the change of the PIN. In this way, the PIN can be changed easily.

[0035] The inclined surface 26e and the inclined surface 28c make surface contact, allowing the second cam member 28 to move easily in the axial direction in response to the movement of the first cam member 26 in the orthogonal direction. Furthermore, the inclined surface 26d and the inclined surface 20d make surface contact, allowing the first cam member 26 to move easily in the orthogonal direction in response to the axial movement of the lock bar 20 due to the pulling of the latch 18. In addition, the inclined surface 26e and the inclined surface 28c make surface contact, allowing the first cam member 26 to move easily in the orthogonal direction in response to the movement of the second cam member 28 in the axial direction.

[0036] To change the PIN, it is necessary to press the first cam member 26 from the outside of the lock case 14 and turn the dial 22. However, since the window portion 14e into which the dial 22 is fitted and the hole 14f that exposes the first cam member 26 so that it can be pressed are formed close together, the operation to change the PIN becomes easier.

[0037] In a key box 10 having multiple dials 22 and multiple dial connecting cylinders 24, a multi-digit PIN can be easily set.

[0038] In the above embodiment, the push button 26b protrudes from the hole 14f before the first cam member 26 is pressed in, but it is not limited to this. The push button 26b may be exposed so as to be substantially flush with the outer surface of the case body 14a, or it may be located slightly inward from the outer surface of the case body 14a, as long as it can be pressed from the outside of the case body 14a. [Explanation of Symbols]

[0039] 10 Key Boxes 12 Box Body 12a opening 12b,14c,24c,26a,28a through hole 14 Lock Case 14a Case body 14b Lid 14d wall 14e Window section 14f hole 16 dial lock 18. Bet 18a First end 18b Second end 20 Rock Bar 20a Bar body 20b Connecting part 20c groove 20d,26d,26e,28c Slope 20e protrusion 22 Dials 22a protrusion 24 Dial connecting cylinder 24a Large diameter section 24b Small diameter section 24d Locking part 26 First cam member 26b Push button 26c, 28b recess 28 Second cam member 30 Elastic members 32 leaf springs

Claims

1. A box body having an opening on one side, A lock case is pivotably mounted to the box body in order to open and close the aforementioned opening, A dial lock housed in the aforementioned lock case and capable of changing the PIN code, It comprises a U-shaped latch having a first end that is inserted through the lock case and connected to the dial lock, and a second end that can be moved in and out of the box body when the lock case is swung relative to the box body and the opening is closed, The aforementioned dial lock is A locking bar connected to the first end of the latch, A ring-shaped dial is passed through the lock bar and a portion of its outer surface is exposed from the lock case so that it can be accessed from the outside, A dial connecting cylinder fitted onto the lock bar and interposed between the dial and the lock bar, A first cam member is passed through the lock bar so as to be located on the latch side of the dial and is movable in a direction perpendicular to the axial direction of the lock bar by pressing from outside the lock case, A second cam member is fitted onto the lock bar between the dial connecting cylinder and the first cam member, The dial connecting cylinder is provided with an elastic member that resiliently extends toward the latch side, The second cam member is configured to be movable in the axial direction in accordance with the movement of the first cam member in the orthogonal direction, The key box is configured such that the first cam member can move in the orthogonal direction in response to the axial movement of the lock bar due to the pulling of the latch and the axial movement of the second cam member due to the elastic member.

2. The first cam member has a first inclined surface and a second inclined surface, The second cam member has a third inclined surface that can make surface contact with the first inclined surface, The key box according to claim 1, wherein the lock bar has a fourth inclined surface that can make surface contact with the second inclined surface.

3. The key box according to claim 1 or 2, wherein the lock case includes a window portion into which the dial is fitted such that a part of the outer surface of the dial is exposed to the outside, and a hole in the vicinity of the window portion that allows the first cam member to be pressed.

Images