Push button lock

Abstract

To search for a password only by operating with an emergency key.SOLUTION: A push-button lock 100 includes: a locking / unlocking mechanism; a plurality of push-buttons 300 which have button shafts (a first button shaft 1, a second button shaft 2) and each of which moves between a retracted position and a projected position; an operation part (knob 500) which accepts an unlocking operation for the locking / unlocking mechanism when the push-button 300 which is set as a PIN among the plurality of push-buttons 300 is in the retracted position and the push-button 300 that is not set as the PIN is in the projected position and the unlocking operation is permitted; an engaged part 2K provided on each button shaft; a reset bar 41 having a plurality of engaging parts (holes 42) opposed to each engaged part 2K and capable of approaching and separating from the engaged part 2K; and an interlocking mechanism (clutch cam 85) for switching the plurality of push-buttons 300 to an unlocking operation permission state by bringing the engaging parts into contact with the engaged part 2K in interlocking with the operation of the locking / unlocking mechanism using an emergency key.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a push button lock. [Background technology]

[0002] One type of lock used to lock doors and the like is a push-button lock, which does not require a key and can be unlocked by pressing a push-button corresponding to a PIN number. Another type of push-button lock is equipped with a cylinder lock, which can be unlocked by inserting an emergency key into the cylinder if the user forgets the PIN number. However, even if the push-button lock is unlocked using the emergency key, it cannot be used normally again unless there is a way to search for the PIN number. Therefore, a function for searching for the PIN number has been considered. For example, in Patent Document 1, when a user presses all of the push-button buttons, only the search pin that does not correspond to the PIN number has its tip protruding from the pin insertion hole on the back of the push-button lock, making it possible to determine which push-button corresponds to the PIN number. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-141869 Summary of the Invention [Problem to be solved by the invention]

[0004] However, with the configuration described in Patent Document 1, it is not possible to search for the personal identification number unless all of the push buttons are pressed.

[0005] SUMMARY OF THE INVENTION In consideration of the above circumstances, the present invention aims to provide a push button lock that allows a personal identification number to be searched for simply by operating an emergency key. [Means for solving the problem]

[0006] In order to solve the above problems, the push button lock of the present invention comprises a locking / unlocking mechanism that can be switched between a locked state and an unlocked state, a plurality of push buttons having a button shaft and moving between a retracted position and an extended position, an operation unit that accepts an unlocking operation for the locking / unlocking mechanism when a push button among the plurality of push buttons that is set as a PIN number is in the retracted position and a push button that is not set as a PIN number is in the extended position, thereby allowing an unlocking operation, an engaged portion provided on each of the button shafts, a reset bar that has a plurality of engaging portions facing each of the engaged portions and can move toward and away from the engaged portions, and a linkage mechanism that switches the plurality of push buttons to the unlocking operation allowed state by bringing the engaging portions into contact with the engaged portions in linkage with the operation of the locking / unlocking mechanism using an emergency key. [Effects of the Invention]

[0007] According to the present invention, the personal identification number can be searched for simply by operating the emergency key. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a front view showing the appearance of a push button lock according to an embodiment of the present invention; [Figure 2] FIG. 2 is a cross-sectional view showing the FF cross section of FIG. [Figure 3] FIG. 3 is a cross-sectional view showing the cross section AA of FIG. 2. [Figure 4] FIG. 3 is a cross-sectional view showing the cross section BB of FIG. 2. [Figure 5] FIG. 3 is a cross-sectional view showing the CC cross section of FIG. 2. [Figure 6] FIG. 3 is a cross-sectional view showing the cross section DD of FIG. 2. [Figure 7] FIG. 3 is a cross-sectional view showing the E-E cross section of FIG. 2. [Figure 8] 1 is a cross-sectional view showing the operation of an unlocking operation using an emergency key according to one embodiment of the present invention. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0009] A push button lock 100 according to one embodiment of the present invention will be described below with reference to the drawings.

[0010] First, the overall configuration of the push button lock 100 will be described. Figure 1 is a front view showing the appearance of the push button lock 100. Hereinafter, the front side of the paper in Figure 1 will be referred to as the front side (front side) of the push button lock 100, and left and right directions will be based on the push button lock 100 being viewed from the front. In each figure, U, Lo, L, R, Fr, and Rr represent up, down, left, right, front, and back, respectively.

[0011] The push button lock 100 (see Figure 1) is installed in coin lockers, building entrances, etc. The push button lock 100 has a case 200 that is generally rectangular parallelepiped. A knob 500 used for locking and unlocking operations is provided on the front of the case 200. In the locked state, a cam 600 (latch) protrudes from the lower left side of the case 200. For example, if the push button lock 100 is installed on the main body of a coin locker, the lock is achieved by the cam 600 engaging with a recess provided in the door of the coin locker. When the knob 500 is rotated counterclockwise, the cam 600 rotates in the same direction, disengaging from the door. A latch 700 is provided on the upper left side of the case 200. Note that the push button lock 100 may be installed on the door, and the cam 600 may engage with a recess provided in the main body.

[0012] Above the knob 500, multiple push buttons 300 and one clear button 400 are arranged in a regular pattern. In the example of FIG. 1, eleven push buttons 300, each bearing the numbers 0 to 9 and the # symbol, and a clear button 400 bearing the letter C, are arranged in a 3-by-4 grid. The clear button 400 is located in the upper left corner. The push buttons 300 are used to input a PIN number. The clear button 400 is used to initialize the PIN number.

[0013] Next, the internal configuration of the push button lock 100 will be described. Fig. 2 is a cross-sectional view showing the FF cross-section of Fig. 1. Fig. 3 is a cross-sectional view showing the AA cross-section of Fig. 2. Fig. 4 is a cross-sectional view showing the BB cross-section of Fig. 2. Fig. 5 is a cross-sectional view showing the CC cross-section of Fig. 2. Fig. 6 is a cross-sectional view showing the DD cross-section of Fig. 2. Fig. 7 is a cross-sectional view showing the EE cross-section of Fig. 2.

[0014] The push button lock 100 comprises a locking / unlocking mechanism (cam 600) that can be switched between a locked state and an unlocked state, multiple push buttons 300 that have button shafts (first button shaft 1, second button shaft 2) and move between a retracted position and an extended position, an operation unit (knob 500) that accepts an unlocking operation for the locking / unlocking mechanism when the push button 300 that is set as a PIN number among the multiple push buttons 300 is in the retracted position and the push button 300 that is not set as a PIN number is in the extended position, which is an unlocking operation permitted state, an engaged portion 2K provided on each of the button shafts, a reset bar 41 that has multiple engaging portions (holes 42) that face each of the engaged portions 2K and can be moved toward and away from the engaged portions 2K, and an interlocking mechanism (clutch cam 85) that switches the multiple push buttons 300 to the unlocking operation permitted state by bringing the engaging portions into contact with the engaged portions 2K in conjunction with the operation of the locking / unlocking mechanism using an emergency key.

[0015] The front of the case 200 (see FIG. 2) is provided with button holes 200H corresponding to the push button 300 and the clear button 400. The rear portions of the push button 300 and the clear button 400 have a larger diameter than the button holes 200H, preventing the push button 300 and the clear button 400 from falling out of the button holes 200H. The push button 300 and the clear button 400 are biased forward by a coil-shaped button spring 4 provided between the case 200 and the push button 300 and the clear button 400.

[0016] A first button shaft 1, whose longitudinal direction is the front-to-rear direction, is provided at the rear of the push button 300. A second button shaft 2, whose longitudinal direction is the front-to-rear direction, is provided at the rear of the first button shaft 1. A third button shaft 3, whose longitudinal direction is the front-to-rear direction, is provided at the rear of the clear button 400.

[0017] A first notch 1A that opens upward is provided at the rear end of the first button shaft 1. A second notch 1B that is the same in depth and width as the first notch 1A is provided in front of the first notch 1A. The center-to-center distance between the first notch 1A and the second notch 1B is equal to the stroke of the push button 300. A sloped portion 1S that is sloped so that the front side is higher than the rear side is provided in front of the second notch 1B.

[0018] The front end of the second button shaft 2 is provided with a third notch 2C that opens upward. The rear end of the second button shaft 2 is provided with an engaged portion 2K. The engaged portion 2K is, for example, a notch that opens upward and has an upright portion 2V that stands upright in the vertical direction and an inclined portion 2S that is inclined so that the rear side is higher than the front side. A groove 2M that opens downward is provided in front of the third notch 2C.

[0019] Behind the push button 300, in order from the front, are provided a button stopper 11 (see FIG. 3), a solid stopper plate 21 (see FIG. 4), a retaining plate holder 31 (see FIG. 5), a blocking plate 51 (see FIG. 7), and a reset bar 41 (see FIG. 6). The button stopper 11, the solid stopper plate 21, the retaining plate holder 31, the blocking plate 51, and the reset bar 41 are all plate-shaped members whose thickness is in the front-to-rear direction. The button stopper 11, the solid stopper plate 21, and the retaining plate holder 31 each have holes 12, 22, and 32 corresponding to the multiple first button shafts 1. The first button shafts 1 pass through the holes 12, 22, and 32 of the button stopper 11, the solid stopper plate 21, and the retaining plate holder 31. The reset bar 41 and the blocking plate 51 each have holes 42 and 52 corresponding to the multiple second button shafts 2. The second button shaft 2 passes through the holes 42 and 52 in the reset bar 41 and the baffle plate 51 .

[0020] The button stopper 11 (see Figures 2 and 3) is supported by the case 200 so as to be slidable in the left-right direction. The button stopper 11 is biased to the left by a button stopper spring 13 provided between the button stopper 11 and the case 200. The left edge of the button stopper 11 is provided with an inclined portion 14 whose upper side protrudes more leftward than the lower side. A stopper pusher 15 is provided from below the inclined portion 14 to the lower center of the button stopper 11. The upper end of the stopper pusher 15 contacts the inclined portion 14 of the button stopper 11. The stopper pusher 15 is supported by the case 200 so as to be slidable in the up-down direction. A roller 16 whose axial direction is in the front-to-rear direction is provided at the bottom of the stopper pusher 15.

[0021] The solid cover plate 21 (see Figures 2 and 4) is supported by the case 200 so as to be slidable in the vertical direction. The solid cover plate 21 is biased downward by a solid cover plate spring 23 provided between the solid cover plate 21 and the case 200. A protrusion 24 that protrudes downward is provided at the center in the left-right direction of the lower end of the solid cover plate 21.

[0022] The retaining plate holder 31 (see FIGS. 2 and 5) is supported by the case 200 so as to be slidable in the up-down direction. The retaining plate holder 31 is biased downward by a retaining plate holder spring 37 provided between the retaining plate holder 31 and the case 200. A retaining plate 33 is inserted into the hole 32 of the retaining plate holder 31 together with the first button shaft 1. The retaining plate 33 has a base 34 whose longitudinal direction is the front-to-rear direction, a first protrusion 35 protruding left or right from the front end of the base 34, and a second protrusion 36 protruding left or right from the rear end of the base 34. The base 34 is supported in the hole 32 of the retaining plate holder 31. The retaining plate 33 slides up and down together with the retaining plate holder 31. The retaining plate 33 is also slidable in the front-to-rear direction relative to the retaining plate holder 31. A roller 38 whose axial direction is the front-to-rear direction is provided in the center of the left-to-right direction at the lower end of the retaining plate holder 31.

[0023] The first protrusion 35 of the retaining plate 33 engages with the first notch 1A or the second notch 1B of the first button shaft 1. The second protrusion 36 of the retaining plate 33 engages with the third notch 2C of the second button shaft 2. In FIG. 2, two push buttons 300 are shown below the clear button 400. Of these, the first protrusion 35 of the lower push button 300 engages with the first notch 1A. On the other hand, the first protrusion 35 of the upper push button 300 engages with the second notch 1B. Therefore, the lower push button 300 has a shorter overall length, including the first button shaft 1 and the second button shaft 2, than the upper push button 300. A state in which the overall length is short, such as the lower push button 300, is called a contracted state, and a state in which the overall length is long, such as the upper push button 300, is called an extended state.

[0024] The reset bar 41 (see FIGS. 2 and 6) is supported by the case 200 so as to be slidable in the vertical direction. The reset bar 41 is urged downward by a reset bar spring 43 provided between the reset bar 41 and the case 200. A connecting portion 44 that protrudes downward is provided on the left side of the center of the lower end of the reset bar 41. The connecting portion 44 is connected to a clutch cam 85, which will be described later. The hole 42 of the reset bar 41 houses the engaged portion 2K of the second button shaft 2. The hole 42 of the reset bar 41 is an example of an engaging portion that faces the engaged portion 2K.

[0025] The baffle plate 51 (see Figures 2 and 7) is supported by the case 200 so as to be slidable in the vertical direction. The baffle plate 51 is urged downward by a baffle plate spring 53 provided between the baffle plate 51 and the case 200. A baffle plate pusher 54 is provided below the baffle plate 51. A roller 55 whose axial direction is the front-to-rear direction is provided at the lower end of the baffle plate pusher 54. The baffle plate 51 is urged upward by a baffle plate pusher spring 56 provided between the baffle plate 51 and the baffle plate pusher 54. The baffle plate 51 is provided with a lock plate 57 that locks the outer cylinder 82 of a cylinder lock 81 (described later).

[0026] The slider 61 (see Figures 2 to 5 and 7) is provided below the button stopper 11, the light control plate 21 and the retaining plate holder 31. The slider 61 is supported by the case 200 so that it can slide left and right. Figures 3 to 5 show the slider 61 positioned at the rightmost position. A rack 62 is provided at the rear end of the underside of the slider 61, with its longitudinal direction extending left and right.

[0027] The slider 61 has different cross-sectional shapes at the portion facing the button stopper 11, the portion facing the solid cover plate 21, and the portion facing the retaining plate holder 31 (see FIGS. 3 to 5).

[0028] The portion of the slider 61 facing the button stopper 11 (see FIG. 3) has an upwardly opening recessed portion 63. An inclined recessed portion 64 is provided in the upper right portion of the recessed portion 63, with the right side being higher than the left side. An inner slider 65 is provided inside the recessed portion 63 and is slidable in the left-right direction relative to the slider 61. A trapezoidal protrusion 66 is provided on the top of the inner slider 65.

[0029] At a portion of the slider 61 facing the solid cover plate 21 (see FIG. 4), a first step 71, a second step 72, and a third step 73 facing the left surface of the protrusion 24 of the solid cover plate 21 are provided.

[0030] At the portion of the slider 61 facing the retaining plate holder 31 (see FIG. 5), the rollers 38 of the retaining plate holder 31 can roll left and right on the top surface of the slider 61. A high surface 74 is provided to the right of the center of the top surface of the slider 61, and a low surface 75 that is lower in height than the high surface 74 is provided on the left side, with the high surface 74 and the low surface 75 connected by an inclined surface 76.

[0031] A cylinder lock 81 is provided below the slider 61 (see FIG. 2). The cylinder lock 81 has an outer cylinder 82 and an inner cylinder 83 with their longitudinal directions extending in the front-to-rear direction. The knob 500 is integrated with the outer cylinder 82. The centers of rotation of the outer cylinder 82 and the inner cylinder 83 are the same as the center of rotation of the knob 500. A clutch 84, a clutch cam 85, and a clutch spring 86 are provided at the rear end of the inner cylinder 83. The clutch cam 85 is connected to the connecting portion 44 of the reset bar 41 by a cam set screw 87 (see FIG. 6). The clutch cam 85 is equipped with a pinion 88 that meshes with the rack 62 of the slider 61 (see FIG. 7). The clutch cam 85 rotates as the knob 500 or the inner cylinder 83 rotates, and the slider 61 slides as the clutch cam 85 rotates.

[0032] [Locking operation] Next, the locking operation of the push button lock 100 will be described. In the unlocked state, the slider 61 is located at the left end of its sliding range. At this time, the left surface of the protruding portion 24 of the solid cover plate 21 contacts the first step portion 71 of the slider 61. Therefore, even if you try to turn the knob 500 without pressing the push button 300 corresponding to the PIN number, you cannot turn the knob 500. Also, in the unlocked state, the roller 38 of the retaining plate holder 31 contacts the high surface 74 of the slider 61, so the retaining plate holder 31 is located in a high position. Therefore, the retaining plate 33 is separated from the first button shaft 1 and the second button shaft 2. Also, in the unlocked state, all of the push buttons 300 are extended. The jamming plate 51 engages with the engaging portion 2K of the second button shaft 2.

[0033] Next, when the personal identification number is pressed, the inclined portion 1S of the first button shaft 1 of the pressed push button 300 lifts the solid cover plate 21, and the protruding portion 24 of the solid cover plate 21 moves above the first step portion 71.

[0034] Next, when the knob 500 is turned clockwise, the roller 38 of the retaining plate holder 31 falls onto the lower surface 75 of the slider 61, causing the retaining plate holder 31 to move to a lower position. As a result, the first protrusion 35 of the retaining plate 33 engages with the first notch 1A of the first button shaft 1, and the second protrusion 36 of the retaining plate 33 engages with the third notch 2C of the second button shaft 2.

[0035] Next, when the knob 500 is turned further clockwise, the inner slider 65 is pushed by the slider 61, and the roller 16 of the stopper pusher 15 rides up onto the protrusion 66 of the inner slider 65. Then, the upper end of the stopper pusher 15 slides the button stopper 11 to the right, releasing the button stopper 11 from locking the first button shaft 1. At this time, the baffle plate 51 is inserted in the groove 2M of the second button shaft 2, so the push button 300 does not protrude forward.

[0036] When the stopper pusher 15 overcomes the protrusion 66, the jamming plate 51 is pulled downward, disengaging from the groove 2M of the second button shaft 2 and causing the push button 300 to protrude forward. In addition, the locking plate 57 descends to lock the outer tube 82 and the knob 500 against reverse rotation.

[0037] [Unlocking operation] Next, the unlocking operation will be described. In the locked state, after pressing the push button 300 corresponding to the PIN number, rotating the knob 500 counterclockwise causes the stopper pusher 15 to climb the recessed inclined portion 64 of the slider 61, and the jamming plate 51 enters the groove 2M of the second button shaft 2. The jamming plate 51 also lifts the locking plate 57, disengaging it from the outer tube 82. The roller 38 of the jamming plate holder 31 moves from the lower surface 75 to the higher surface 74 of the slider 61, disengaging the fastening plate 33 from the fastening plate holder 31. The stopper pusher 15 also rides up the protrusion 66 of the inner slider 65, sliding the button stopper 11 and disengaging the first button shaft 1. At this time, the connection between the first button shaft 1 and the second button shaft 2 by the jamming plate 33 is released, causing the push button 300 to protrude forward.

[0038] Even if the personal identification number is not pressed in the locked state or a different number is pressed, the jammer plate 51 contacts the second button shaft 2 and the lock plate 57 does not come off the outer cylinder 82, so the knob 500 does not rotate.

[0039] When the PIN number is pressed in the locked state, the solid door plate 21 is lifted by the first button shaft 1, and the protrusion 24 of the solid door plate 21 moves above the third step 73 of the slider 61. Next, when the knob 500 is rotated further, the first button shaft 1 is released from the button stopper 11, the push button 300 protrudes forward, and the solid door plate 21 is pushed by the solid door plate spring 23, so that the protrusion 24 engages with the second step 72 of the slider 61.

[0040] [Unlocking with emergency key] Next, the unlocking operation using the emergency key will be described (see Figures 2, 6, and 8). Figure 8 is a cross-sectional view showing the push button lock 100 unlocked with the emergency key. The emergency key is not shown. In the locked state, when the emergency key is inserted all the way into the keyhole 89, the clutch 84 moves to the back and connects with the clutch cam 85. When the emergency key is turned in the unlocking direction in this state, the cam 600 and the clutch 84 rotate in the unlocking direction, but because the clutch 84 has play relative to the clutch cam 85 and spins freely, the clutch cam 85 does not rotate and the reset bar 41 does not descend.

[0041] Next, when the emergency key is further turned in the unlocking direction with the emergency key fully inserted, the cam 600 and clutch 84 rotate in the unlocking direction, the clutch cam 85 rotates, and the reset bar 41 moves down. The second button shaft 2, first button shaft 1, and push button 300 are retracted by 0 mm. Even if the emergency key is turned in the unlocking direction, the cam 600 does not rotate, and the locked state is maintained.

[0042] Next, when the emergency key is further turned in the unlocking direction while still fully inserted, the cam 600 and clutch 84 rotate in the unlocking direction, the clutch cam 85 rotates, and the reset bar 41 moves further down. The second button shaft 2, first button shaft 1, and push button 300 are in the retracted position when they are in the contracted state. Meanwhile, the second button shaft 2, first button shaft 1, and push button 300 are in the extended state with a retraction amount of 0 mm. Therefore, the push button 300 in the contracted state, i.e., the push button 300 corresponding to the PIN number, can be easily distinguished visually. Even when the emergency key is turned in the unlocking direction, the cam 600 does not rotate, and the locked state is maintained.

[0043] After searching for the PIN number by rotating the emergency key, turning the knob 500 to the UNLOCK display position rotates the cam 600 to the unlocked state, and removing the emergency key completes the reset.

[0044] The push button lock 100 of this embodiment described above comprises a locking / unlocking mechanism (cam 600) that can be switched between a locked state and an unlocked state, a plurality of push buttons 300 having button shafts (first button shaft 1, second button shaft 2) and that move between a retracted position and an extended position, an operation unit (knob 500) that accepts an unlocking operation for the locking / unlocking mechanism when the push button 300 among the plurality of push buttons 300 that is set as a PIN number is in the retracted position and the push button 300 that is not set as a PIN number is in the extended position, which is an unlocking operation permitted state, an engaged portion 2K provided on each of the button shafts, a reset bar 41 that has a plurality of engaging portions (holes 42) that face each of the engaged portions 2K and can be moved toward and away from the engaged portions 2K, and a linkage mechanism (clutch cam 85) that switches the plurality of push buttons 300 to an unlocking operation permitted state by bringing the engaging portions into contact with the engaged portions 2K in conjunction with the operation of the locking / unlocking mechanism using an emergency key. According to this configuration, the personal identification number can be searched for simply by operating the emergency key. [Explanation of symbols]

[0045] 1 First button axis (button axis) 2 Second button axis (button axis) 2K Engaged part 41 Reset Bar 42 Hole (engagement part) 85 Clutch cam (interlocking mechanism) 100 push button lock 300 push button 500 Knob (operating part) 600 Cam (locking / unlocking mechanism)

Claims

[Claim 1] a locking / unlocking mechanism that can be switched between a locked state and an unlocked state; a plurality of push buttons each having a button shaft and moving between a retracted position and an extended position; an operation unit that accepts an unlocking operation for the locking / unlocking mechanism when a push button that is set as a PIN number among the plurality of push buttons is in the retracted position and a push button that is not set as a PIN number is in the protruding position, thereby allowing an unlocking operation; an engaged portion provided on each of the button shafts; a reset bar having a plurality of engaging portions facing the engaged portions, the reset bar being capable of approaching and moving away from the engaged portions; A push button lock characterized by comprising a linkage mechanism that switches the multiple push buttons to the unlocking operation permitted state by bringing the engaging portion into contact with the engaged portion in conjunction with the operation of the locking / unlocking mechanism using an emergency key.

Images