Electric latch lock

Abstract

To change a locked state of a reversal latch to a released state when closing a door by using a cam mechanism including a cam gear and a slider movable in a horizontal direction in a reversal latch type electric lock.SOLUTION: An electric latch lock comprises: the reversal latch having a tip part that protrudes from a front of a lock box; a reversal stopping member including a locking piece that stops reversal of the reversal latch; an electric motor whose start-up, rotation direction, and stopping is controlled by a control part; power transmission means including a gear that transmits a driving force of the electric motor; a cam gear linked with the power transmission means; a power conversion mechanism composed of an eccentric cam groove formed in the cam gear and an engaging pin engaging with the eccentric cam groove; and a slider in which a rotary motion of the cam gear becomes a linear motion. When the lock is unlocked and the electric motor is started, the slider advances to the reversal latch side via the power transmission means and the power conversion mechanism and releases a stopped state of the locking piece to the reversal latch.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an electric latch lock, and more particularly to an electric latch lock that is attached to the free end of a horizontally rotating door. [Background technology]

[0002] The solution of the reverse latch type electric lock A of Patent Document 1 comprises a reverse latch 10 provided in a latch case 11 so as to be reversible and retractable, a locking section 20 that prevents the reverse latch 10 from reversing and retracting, an unlocking and holding section 30 that unlocks and holds the reverse latch 10 locked by the locking section 20, and an electric driving section 40 including a cam mechanism that converts rotation by a cam element 41a into movement of the locking section 20. A transmission rod 15 that transmits movement due to the retraction of the latch is provided in the latch case 11, and an input signal drives the electric driving section 40 to rotate the cam element 41a, setting the reverse latch 10 to the unlocked state, and the retraction movement of the reverse latch 10 due to the opening and closing of the door is transmitted to the unlocking and holding section 30 via the transmission rod 15, setting the locking section 20 to the locked state.

[0003] Regarding the above configuration, paragraphs 0027 to 0031 of the specification, with some omissions, generally contain the following explanation: "Paragraph 0027... electric drive unit 40 comprises cam member 41, a cam mechanism that converts the rotation of this cam member 41 into the movement of lock unit 20, and drive unit 42 of electric motor 42m that drives this cam mechanism. ... As shown in Figure 4, power is supplied to electric motor 42m and microswitch 44 from battery 51 of power supply control unit 50 that is separately provided, and transmission signals are sent and received via a connection cord." Also, paragraph 0028... microswitch 44 is fitted with operating piece 45 for inputting switch on / off signals, and is set so that an operating signal is generated when cam element 41a of the cam mechanism hits this operating piece 45 with each rotation. ... As shown in Figure 4, The power supply control unit 50, which includes a control circuit 52 that controls the power supply, and a battery 51, are connected to the power supply control unit 50. ...The power supply control unit 50 is controlled by inputting a control signal from a signal transmission unit 53. The transmission format of the signal transmission unit 53 may be either a wired system such as a numeric keypad, or a wireless system (non-contact) that can be operated from a remote location." Also, "Paragraph 0030...The reverse latch electric lock A is used by being attached to an opening / closing door, such as an auto-lock installed on the entrance / exit door of a hotel guest room. This reverse latch electric lock is normally kept in a locked state, but can be unlocked by sending an unlock signal from outside the room when entering the room, and can be locked after opening the opening / closing door and entering the room." Furthermore, "Paragraph 0031... To release the locked state, the signal transmitting unit 53 sends an input signal for releasing the lock, and that signal sends a drive signal from the power supply control unit 50 to supply power from the battery 51 to the electric motor 42m of the electric drive unit 40. Then, as the electric motor 42m of the electric drive unit 40 rotates, the engaging terminal 24 provided on the lock unit 20 is disengaged (pushed down) from the locked state in which it is engaged with the reverse latch 10 with one rotation of the cam element 41a of the cam mechanism, thereby driving the set state of the reverse latch 10 to the unlocked state. (The symbols are those of Patent Document 1.)

[0004] In relation to the constituent features of the present invention, the following remarks will be made regarding the above configuration. In the above-mentioned reverse latch electric lock A, when the output shaft rotates due to the driving force of the drive motor 42, instead of a solenoid, the cam element 41a, which is integrally attached to the output shaft and protrudes radially outward from the cylindrical boss portion 41 in a rice ball shape, rotates. When the cam element 41a rotates, the locking member 21, which is formed in a roughly angular shape, descends against the spring force of the spring 26 disposed between the inner surface of the bottom wall of the lock box and the horizontal spring end support portion (spring receiver) 25 of the locking member 21, thereby releasing the constraint (engagement) on the reverse latch 10.

[0005] That is, for example, by remotely operating a remote controller, unlocking identification information is input to the control circuit 52 of the power supply control unit 50, and if the identification information is correct, the electric motor serving as the electric drive unit 40 is started by a control signal from the power supply control unit 50, which causes the cam element 41a integrated with the output shaft to rotate, and in conjunction with this, the approximately angle-shaped locking member 21 descends, changing the setting state of the reverse latch 10 to the unlocked state.

[0006] Therefore, the reverse latch type electric lock A described in Patent Document 1 can set the reverse latch 10 to the unlocked state with a simple configuration. However, (a) since the means for transmitting the driving force of the electric motor employs a cam element 41a that protrudes radially outward from the cylindrical boss portion 41 in a rice ball shape, in order to increase the downward displacement of the approximately angular locking member 21 in conjunction with this, the cam element 41a must be made large; (b) when the displacement amount is increased, the spring force of the return spring 26 must be increased accordingly, and therefore, when the locking member 21 is significantly lowered against the spring force of the return spring 26, the engagement claw 2 of the locking member 21 must be made large in order to maintain the unlocked state of the reverse latch 10. (c) a horizontal transmission rod must be provided in the head portion (spring receiver for the reverse latch) 18 provided at the rear end of the reverse latch 10 in order to release the lock release / holding member from the engaging claw 23 of the locking member 21; (d) furthermore, since a substantially angle-shaped locking member 21 linked with the cam element 41a is used, when the positions of the various components are taken into consideration, it is not possible to easily adopt, for example, a pair of upper and lower locking bars that can swing like scissors. (e) Furthermore, in Patent Document 1, an operating piece 45 that turns on and off the microswitch 44 is attached, but it is not possible to weaken the rotational force of the electric motor. R Detectors, brake levers etc. are not mentioned or suggested.

[0007] Patent document 2 describes a latch lock that has a pair of upper and lower locking bars that can swing like scissors inside the lock box, but the reverse latch of the locking bar is not prevented (locked) and released by the operating force of a push-pull type operating handle, rather than using the driving force of an ``electric motor.'' [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Japanese Patent Application Laid-Open No. 2008-179997 [Patent Document 2] Patent No. 5150134 Summary of the Invention [Problem to be solved by the invention]

[0009] The primary object of the present invention is to address the problems of Patent Document 1 by using a cam mechanism including a cam gear and a horizontally moving slider in a reverse latch-type electric lock to release the locked state of the reverse latch when the door is closed. The second object is to easily employ locking pieces (preferably a pair of upper and lower locking pieces) that are swingably mounted on a support shaft. The third object is, like Patent Document 1, to provide an electric lock that is suitable for automatically opening and closing doors, such as auto-locks installed on building entrance doors and hotel guest room entrance doors. Other objects (such as detecting the locked state of the lock to save power and applying the brakes before the electric motor completely stops) are specified in dependent claims. [Means for solving the problem]

[0010] The electric latch lock of the present invention comprises a reverse latch whose tip protrudes from the front of the lock box, a reverse prevention member including a locking piece that prevents the reverse latch from reversing, an electric motor whose start, rotation direction and stop are controlled by a control unit, a power transmission means including a gear that transmits the driving force of the electric motor, a cam gear that interfaces with the power transmission means, a power conversion mechanism consisting of an eccentric cam groove formed in the cam gear and an engagement pin that engages with the eccentric cam groove, and a slider that converts the rotational motion of the cam gear into linear motion, and is characterized in that when the electric motor is started during unlocking, the slider advances toward the reverse latch via the power transmission means and power conversion mechanism, releasing the blocked state of the locking piece against the reverse latch.

[0011] In the above configuration, the eccentric cam groove of the cam gear is formed along an arc-shaped protrusion that gradually bulges circumferentially from a part of the outer peripheral surface of the central shaft cylinder of the cam gear like the appearance of an ammonite, and when the cam gear rotates in one direction based on the central axis during unlocking, the engagement pin gradually moves away from the central shaft cylinder along the arc-shaped protrusion. Also, the reversal prevention member is characterized by comprising at least one locking piece, a fixed shaft that rotatably supports the locking piece, and a return spring attached to the fixed shaft, one end of which is in pressure contact with the inner wall surface of the lock box and the other end of which is supported by the spring support part of the locking piece. The slider has at least a wide plate-like portion, a pressing portion formed approximately in the center of the tip of the wide plate-like portion, and an engaging portion formed on the wide plate-like portion, and when unlocking, the pressing portion directly or indirectly presses an arm portion extending approximately vertically from the pivot portion of the locking piece, thereby causing the tip engaging portion extending horizontally from the pivot portion of the locking piece to move away from the engaging receiving portion of the reverse latch.Furthermore, the lock box is characterized in that one or more switches are arranged to detect the locked and / or unlocked state of the lock body, and the control unit turns off the power supplied to the electric motor after receiving the locking signal or unlocking signal detected by the switch.

[0012] In a preferred embodiment, a first switch 21 that detects the locked state of the lock body, a second switch 22 that detects the unlocked state of the lock body, and a switch 23 that brakes the electric motor 28 are disposed within the lock box, and the control unit turns off the power after receiving the lock signal detected by the first switch. In addition, an inclined or stepped surface of a groove formed in the cam gear is used to pivotally support an lock / unlock detection lever that selectively turns on and off the first switch 21 and the second switch 22, and a brake detection lever that is connected to the lock / unlock detection lever and selectively turns on and off the switch 23 is pivotally supported. for braking the electric motor The switch 23After acquiring the braking signal detected by the brake control unit, the brake is applied to the electric motor to reduce the rotational force of the electric motor. [Effects of the Invention]

[0013] In consideration of the problems of Patent Document 1, by using a cam mechanism including a cam gear and a horizontally moving slider in a reverse latch-type electric lock, the locked state of the reverse latch can be released when the door is closed. Also, a locking piece (preferably a pair of upper and lower locking pieces) that is swingably mounted on a support shaft can be easily adopted. Furthermore, similar to Patent Document 1, this is suitable for automatically opening and closing doors, such as auto-locks installed on building entrance doors and hotel guest room entrance doors. Depending on the embodiment, it is possible to detect the locked state of the lock to save power, and to apply the brake before the electric motor completely stops to prevent the cam gear from overrunning, for example. [Brief explanation of the drawings]

[0014] 1 to 12 are explanatory views showing a first embodiment of the present invention. [Figure 1] A schematic diagram showing the main components of the lock box (locked state). [Figure 2] This is a schematic diagram of the lock box in Figure 1 when turned upside down with the center line O as the reference (locked state). [Figure 3] FIG. 2 is an explanatory diagram of the main parts (a signal input section including a plurality of switches, a control section, an electric motor, a power transmission means, and a cam gear). [Figure 4] FIG. 2 is an explanatory diagram of the main parts (final gear of the power transmission means, cam gear, and engaging pin with rollers). [Figure 5] FIG. [Figure 6] A schematic cross-sectional explanatory diagram showing the main parts (electric motor, mounting base plate, cam gear, and cam gear central axis) as viewed from the rear end side of the lock box. [Figure 7] 10 is a schematic cross-sectional explanatory view showing an engagement structure between an engagement pin that engages with an eccentric cam groove of a cam gear and a slider. FIG. [Figure 8] An exploded explanatory diagram of the reversal prevention member (shaft, locking bead, locking spring) (only one of the locking beads is shown). [Figure 9] 10 is an explanatory diagram showing the state in which the locking piece is released from the blocking state against the reversal latch due to the forward movement of the slider. [Figure 10] FIG. 4 is an explanatory diagram of a lock / unlock detection lever and a brake detection lever as a signal input unit. [Figure 11] FIG. 10 is an explanatory diagram showing the positions of the lock / unlock detection lever and the brake detection lever when the cam gear has rotated and unlocking has been completed. [Figure 12] 12 is an explanatory diagram showing that the lock / unlock detection lever in FIG. 11 is guided to an inclined surface or a stepped portion formed in an arc-shaped groove formed outside the eccentric cam groove of the cam gear. DETAILED DESCRIPTION OF THE INVENTION

[0015] Figures 1 to 12 show a first embodiment of the present invention, a reverse latch type electric lock for fixtures (hereinafter simply referred to as an "electric latch lock"). Figure 1 is a schematic explanatory diagram (locked state) showing the main components provided in the lock box 3, while Figure 2 is a schematic explanatory diagram (locked state) when the lock box 3 in Figure 1 is turned upside down with the center line O as the reference.

[0016] (1) Main components of the electric latch lock X The electric latch lock X comprises a lock box 3, a reversal latch 6 provided in the lock box, a biasing means 13 for biasing the reversal latch, locking pieces 8A and 8B constituting at least one reversal prevention member 12 that engages and disengages with the reversal latch, an electric motor 28 that preferably utilizes a power source provided in the lock box, a control unit 26 that controls this electric lock, and the electric motor Side Warm 29 a cam gear 35 interlocked with the transmission gear 32; a cam groove 42 formed in the cam gear 35; and an engagement pin 45 engaging with the cam groove. The power conversion device converts the rotational motion of the transmission gear and the cam gear into linear motion. mechanism 41 and the power conversion Mechanism 41and a slider 50 which is displaced horizontally by rotating the locking pieces 8A, 8B of the reversal prevention member 12 which are locked by the reversal latch 6, thereby releasing the locking (locked state) of the reversal latch.

[0017] Preferably, in the above configuration, a first switch 21 for detecting the locked state of the lock body, a second switch 22 for detecting the unlocked state of the lock body, and a switch 23 for braking the electric motor 28 are disposed within the lock box 3, and the control unit 26 turns off the power supply after acquiring the lock signal detected by the first switch. Also, in the above configuration, a lock / unlock detection lever for selectively turning on and off the first switch 21 and the second switch 22 is pivotally supported by utilizing an inclined surface or stepped surface of a groove formed in the cam gear 35, and is further connected to the lock / unlock detection lever, For braking electric motors A brake detection lever that selectively turns on and off the switch 23 is pivotally supported so as to be able to swing, and the control unit 26 controls the switch 23 After acquiring the braking signal detected by the brake control unit 21, the brake is applied to the electric motor 28 to reduce the rotational force of the electric motor 28.

[0018] First, we will explain the main components and environment of the electric latch lock X with reference to Figures 1 and 2. 1 is the door frame, 2 is the horizontally rotating door, 3 is the lock box fixed to the free end of the door 2, 4 is the front, 5 is the strike plate, and 6 is the reverse latch.

[0019] In other words, X is an electric latch lock, and this electric latch lock X has a lock body with the main components mounted in a lock box 3, and the tip of the reverse latch 6 of this lock body protrudes from the front 4 and engages with the engagement hole of the striker 5. As is well known, the base end of the door 2 is pivotally supported by a hinge on the vertical frame of the door frame 1 and rotates horizontally. The lock box 3 shown schematically is generally composed of a case body and a case lid. The lock box 3 in this embodiment is a horizontally elongated box body. Here, we will omit explanations and reference numerals for the details of the lock box 3 and will explain the main components of the electric latch lock X.

[0020] (2) Latch frame 7 Reference numeral 7 denotes a latch frame with a U-shaped vertical cross section fixed to the front center of the lock box 3, and notched openings for receiving the engaging tips 8a, 8a of a pair of upper and lower locking pieces 8A, 8B are formed in the horizontal opposing walls located above and below this latch frame 7. In addition, a spring end support protrudes from the inner surface of the vertical wall perpendicular to the horizontal opposing walls, and a latch spring 13 is provided between the spring end support and the rear end of the reverse latch 6 to constantly urge the reverse latch 6 in the direction of protruding from the front 4.

[0021] (3) Inverting Latch 6 The reverse latch 6 is disposed in the latch opening in the front panel 4 so that its rear end fits within the latch frame 7. When the door is closed, the tip of the reverse latch 6 protrudes from the front panel 4 and engages with the engagement hole in the catch 5. Those skilled in the art call this state a temporary lock, but for convenience, it will be referred to as a "locked or locked state" here.

[0022] Incidentally, the structure of the inverting latch 6 is described in, for example, Japanese Patent Laid-Open No. 8-100559, wish Publication No. 9-325248 (Unexamined Japanese Patent Publication No. 11-141207) This is well known to those skilled in the art, as described in Japanese Patent Application Laid-Open Nos. 10-311173 and 2003-74245.

[0023] Therefore, only a brief explanation will be given here regarding well-known matters. The reverse latch 6 has a roughly diamond-shaped planar shape and includes a latching engagement surface, an inclined surface corresponding to the engagement hole of the catch 5 constituting the catch, a stopper projection, and upper and lower engagement receiving portions 6a, 6a. Generally, when the door 2 is opened or closed, the reverse latch 6 slides against the engagement portion of the catch, and is reversed and moves forward and backward via a gate-shaped latch receiver 11 and a latch spring (compression coil spring) 13 fitted into the rear end (inner end) of the reverse latch 6. The latch receiver 11 has a guide function that stably guides the reverse latch 6 in the horizontal direction (for example, the latch receiver 32 shown in Figure 3 of Japanese Patent Laid-Open Publication No. 11-141207).

[0024] (4) Reversal prevention member 12 The reversal prevention member 12 is a component that constitutes a mechanism that prevents the reversal of the reversal latch 6 when locked, and consists of at least one locking piece (either 8A or 8B), a fixed shaft 9 that supports the locking piece so that it can rotate freely, and a return spring 10 that has a central portion on this fixed shaft, one end pressed against the inner wall surface of the lock box, and the other end supported by the spring support portion of the locking piece (either 8A or 8B).

[0025] The reversal prevention member 12 of this embodiment includes a pair of upper and lower locking pieces 8A and 8B. The pair of locking pieces 8A and 8B are connected to each other via a movable connecting shaft 15 that engages with elongated holes at the tips of the vertical arms, as described in, for example, Japanese Patent No. 5150134. The configuration of the pair of locking pieces 8A and 8B is publicly known, so a brief description will be given here. Reference numeral 8a denotes an engagement tip extending substantially horizontally from a pivotal support portion located approximately in the center toward the engagement receiving portion 6a of the reversal latch 6. Reference numeral 8b denotes an engagement rear end extending from the pivotal support portion in the opposite direction from the engagement tip. Reference numeral 8c denotes an arm portion extending substantially vertically from the pivotal support portion. In this embodiment, when the lock body is unlocked, a protruding pressing portion 52 formed at the tip of the slider 50 presses against the rear surfaces of the tips of the arm portions 8c of the locking pieces 8A and 8B. As a result, the movable connecting shaft 15 moves forward (towards the reverse latch, left side of the drawing) the required amount, and the upper and lower set of locking pieces 8A, 8B rotate around the fixed shafts 9, 9 as a fulcrum in a direction in which the upper and lower engaging tip portions 8a, 8a move away from the upper and lower engaging receiving portions 6a, 6a of the reverse latch 6 (scissor swing).

[0026] When locked, the electric motor 28 Side Warm 29 rotates in the opposite direction to when unlocking, the slider 50, which is linked to the cam gear 35, moves in a direction away from the reverse latch 6. Then, the pressing portion 52 of the slider 50 retracts from the rear surface of the tip of the arm portion 8c, and the locking pieces 8A, 8B rotate in the locking direction due to the spring force of the return spring 10. As a result, the upper and lower engaging tip portions 8a, 8a engage with the upper and lower engaging receiving portions 6a, 6a of the reverse latch 6.

[0027] (5) Mounting base material, main material Referring to Figure 1, a flat frame- or box-shaped mounting base member 19 having a plurality of support shafts, shaft holes, small through holes, rectangular openings, etc. is fixedly mounted on the rear side of the interior space of the horizontally elongated lock box 3. A horizontal support plate 20 is mounted near the center of the mounting base member 19, and on the top surface of the horizontal support plate 20, a first switch (detector) 21 for detecting the locked state of the lock body, a second switch (detector) 22 for detecting the unlocked state of the lock body, and a switch (detector) 23 for braking the electric motor 28 are arranged side by side. For braking electric motors The switch 23 is provided to weaken the rotational force of the transmission motor 28 since the cam gear 35 overruns after the completion of locking / unlocking is detected, and is not necessarily an essential feature of the present invention.

[0028] Above the first to third switches 21, 22, 23, there are provided an lock / unlock detection lever 24 located on the left side of the drawing, and a brake detection lever 25 located on the right side of the drawing and linked to the lock / unlock detection lever 24. In this embodiment, the first to third switches 21, 22, 23 constitute a signal input unit that mechanically inputs a state signal of the lock body and a braking signal for the electric motor to a control unit 26 provided on the mounting base member 20 via signal lines.

[0029] Although not shown, in addition to the mechanical signal input unit, a remote control can be used to transmit input signals such as a locking start signal and an unlocking start signal to the control unit 26 from a remote location within the radio range. Also, inputs such as a locking start signal and an unlocking start signal can be transmitted to the control unit 26 using a signal input unit such as a numeric keypad, non-touch keys, card reader, RFID tag, face authentication means, or voice recognition means (not shown). Therefore, the locking / unlocking signals can be transmitted to the control unit 26 by wired or wireless means. In such an embodiment, the control unit 26 naturally has a signal transmitting / receiving unit, an authentication unit, a memory unit, etc.

[0030] In this embodiment, a secondary battery (built-in power source) 27 is provided as a battery on the mounting base member 20. Furthermore, an electric motor (electrical drive unit) 28 driven by the secondary battery 27 is provided laterally. The start, rotation direction, and stop of the electric motor 28 are controlled by the control unit 26. The power supplied to the electric motor 28 may be an external power source (commercial power source). When the power source is an external power source, AC power is rectified and supplied to the electric motor 28.

[0031] (6) Power transmission means 31 Next, the power transmission means 31 will be described with reference to Figs. 1 and 2. The power transmission means 31 is a motor 28 side The power transmission means 31 includes a worm (output shaft) 29 and a transmission gear 32 meshing with the worm, and the transmission gear 32 has a large-diameter gear 32a that meshes with the worm 29 and a small-diameter gear (final gear) 32b that protrudes from one side of the large-diameter gear and meshes with engaging teeth formed on the outer periphery of a large-diameter cam gear 35. The power transmission means 31 of the embodiment is attached to, for example, a flat-frame-shaped mounting base member 19 and a gear shaft 36 that is horizontally disposed on a flat-frame-shaped support plate 18 that faces the mounting base member 19.

[0032] (7) Cam gear 35 The large-diameter cam gear 35 is a driven gear that cooperates with the transmission gear 32 of the power transmission means 31. That is, the cam gear 35 can rotate left and right in conjunction with the power transmission means 31. For example, when the transmission gear 32 rotates clockwise, the cam gear 35 rotates counterclockwise, and when the transmission gear 32 rotates counterclockwise, the cam gear 35 rotates clockwise.

[0033] (8) Power conversion mechanism 41 Next, the power conversion mechanism 41 will be described with reference to Figures 3, 4, etc. The power conversion mechanism 41 is composed of an annular or circular eccentric cam groove 42 formed on one side of the cam gear 35, and an engagement pin 45 that engages with the eccentric cam groove and is connected to an engagement portion (e.g., an engagement small hole) 53 of the slider 50.

[0034] The eccentric cam groove 42 of the cam gear 35 is formed along an arc-shaped protrusion 43 that gradually bulges circumferentially from a portion of the outer peripheral surface of the central shaft cylinder 35a of the cam gear 35, like the external shape of an ammonite. When unlocking, when the cam gear 35 rotates in one direction, for example, based on the central shaft 37 that is horizontally installed on the mounting base member 19 and flat frame-shaped support plate 18 inside the lock box 3, so that it is positioned approximately in the center inside the lock box 3, the engagement pin 45 gradually moves away from the central shaft cylinder 35a along the arc-shaped surface of the arc-shaped protrusion 43.

[0035] In this embodiment, one end of the engagement pin 45 is provided with a short cylindrical roller 46 that slides in the eccentric cam groove 42, and the other end is appropriately connected to the rear end side of a slider 50, as shown in Figure 2. Therefore, the electric latch lock X is equipped with a cam gear 35 that is interlocked with the power transmission means 31, and a plate-shaped slider 50 that moves linearly in the longitudinal direction of the lock box 3 due to the rotational movement of this cam gear.

[0036] (9) Slider 50 The slider 50 has at least a wide plate-like portion 51, a pressing portion 52 formed to protrude from approximately the center of the tip of this wide plate-like portion, and an engagement small hole 53 for an engagement pin formed in the wide plate-like portion, and when unlocking, the pressing portion 52 presses the rear surface of the tip of the arm portion 8c extending approximately vertically from the pivot portion of the locking pieces 8A and 8B described above, thereby causing the tip engagement portion 8a extending horizontally from the pivot portion of the locking piece to separate from the engagement receiving portion 6a of the reverse latch 6. In addition, when the electric motor 28 is started when unlocking the electric latch lock X, the slider 50 advances a required amount toward the reverse latch 6 via the power transmission means 31 and the power conversion mechanism 41, releasing the blocked state of the locking pieces 8A and 8B relative to the reverse latch 6.

[0037] A rectangular window is formed at an appropriate location on the wide plate-like portion 51 of the slider 50 as an engagement receiving portion for engaging with a guide protrusion formed by bending one end of the mounting base plate 19. Also, although not shown, a pair of engagement pieces that move vertically against the spring force of a return spring can be incorporated in the approximate center of the lock box 3, as described in Patent Document 2. A pair of drive pieces that can be selectively moved vertically by operating an operating member (e.g., a fish-pull handle) (not shown) enter the rectangular window. When either of these drive pieces moves, the upper and lower locking pieces 8A, 8B rotate in the unlocking direction via the engagement piece, releasing the locking pieces 8A, 8B from their blocking state against the reverse latch 6. The upper and lower ends of the guide protrusions of the mounting base member 19 engage with the upper surface and the opposing lower surface of the window, so the slider 50 is stably guided by the mounting base member 19 during horizontal movement.

[0038] In the embodiment, when unlocking, the pressing portion 52 presses the arm portion extending substantially vertically from the pivot portion of the locking pieces 8A, 8B (including when the movable connecting shaft 15 is directly pressed in), causing the tip engagement portion extending horizontally from the pivot portion of the locking piece to separate from the engagement receiving portion of the reverse latch, but it is also possible to configure the locking pieces 8A, 8B to be interlocked so as to be able to swing freely like scissors (design modification example) by, for example, engaging one end or both ends of the movable connecting portion 15 that engages with the elongated holes of the locking pieces 8A, 8B with a connecting portion (engagement hole, hook portion, etc.) engaged with the pressing portion 52. In such an embodiment, it is not necessarily necessary to provide a "return spring 10 for the locking pieces 8A, 8B."

[0039] (10) Multiple switches 21, 22, 23 1, a horizontal support plate 20 is provided near the center of the mounting base member 19, and a first switch 21 that detects the locked state of the lock body, a second switch 22 that detects the unlocked state of the lock body, and a switch 23 that brakes the electric motor 28 are arranged side by side on the upper surface of the horizontal support plate 20. In this embodiment, the first switch 21, the second switch 22, and the switch 23 are all push-button switches of the same configuration.

[0040] Incidentally, the signals for starting the electric motor 28 of the lock body (locking start signal, unlocking start signal) can be obtained by acquiring a "door close signal" or "door open signal" from various switch means such as magnetically sensitive switches provided on the door frame 1 side and the lock box 3 side, and triggers and limit switches provided on the lock box 3, and start the electric motor 28. In a preferred embodiment, the control unit 26 obtains the start signals for locking and unlocking the electric motor 28 by remote control operation, a mobile terminal, a Nona Touch key, a tag, etc.

[0041] Therefore, when the electric motor 28 is started in either the forward or reverse direction using the start signal of the electric motor 28, it is desirable that the control unit 26 detect not only the open / closed state of the door but also whether the lock body is locked or unlocked. Furthermore, when the electric motor 28 is started, it is desirable to apply a "brake" so that the cam gear 35 does not overrun when the electric motor 28 is stopped. Therefore, the electric latch lock X of this embodiment is provided with not only a first switch 21 that detects the locked state of the lock body and a second switch 22 that detects the unlocked state of the lock body, but also a switch 23 for braking the electric motor 28, at appropriate locations within the lock box 3.

[0042] (11) Lock / unlock detection lever 24 and brake detection lever 25 In a preferred embodiment, as shown in Figure 1, a first switch 21 for detecting the locked state of the lock body, a second switch 22 for detecting the unlocked state of the lock body, and a switch 23 for braking the electric motor 28 are arranged side by side on the upper surface of one side of the horizontal support plate 20.

[0043] A horizontal shaft is provided above the approximate midpoint between the first switch 21 and the second switch 22, and a lock / unlock detection lever 24 is pivotally supported on the horizontal shaft so as to be able to swing freely. The lock / unlock detection lever 24 has a boss portion that fits onto the horizontal shaft on the front side of the drawing, and a pair of fingertip-shaped protrusion portions for pressing (for convenience, the left side will be referred to as the first engagement portion 24a and the right side as the second engagement portion 24b) that extend radially outward from the boss portion, with one protrusion portion (the left first engagement portion 24a) positioned on the rounded push button of the first switch 21 located on the left side of the drawing, and the other protrusion portion (the right second engagement portion 24b) positioned on the rounded push button of the second switch 22 located in the middle.

[0044] Although not shown in Figure 1, the lock / unlock detection lever 24 has a pin-shaped engagement portion (for convenience, referred to as the third engagement portion 24c) on the back side of the other protrusion portion (the right protrusion), and this pin-shaped engagement portion (the third engagement portion 24c) engages with the annular outer groove 47 of the cam gear 35.

[0045] Here, the interlocking relationship between the lock / unlock detection lever 24 and the brake detection lever 25 will be explained. As will be described later, the pin-shaped third engagement portion (a pin extending downward in FIG. 10) 24c of the lock / unlock detection lever 24 engages with the arc-shaped engagement portion (a pin extending in an arc-like or hook-like shape to the left in FIG. 10) 25a of the brake detection lever 25. In this embodiment, the pin-shaped third engagement portion 24c of the lock / unlock detection lever 24 also engages with the annular outer groove 47 of the cam gear 35.

[0046] In this embodiment, the outer peripheral surface 47a forming the annular outer groove 47 and the inner peripheral surface 47b opposite the outer peripheral surface have an outer inclined surface 48 in the middle portion for guiding the pin-shaped third engagement portion 24c of the lock / unlock detection lever 24 and an inner inclined surface 49 opposite the outer inclined surface, and a first arc-shaped groove located slightly outward and a second arc-shaped groove located slightly inward from the first arc-shaped groove are formed on the boundary between the outer inclined surface 48 and the inner inclined surface 49.

[0047] Furthermore, in this embodiment, a locking / unlocking detection lever 24 that selectively turns the first switch 21 and the second switch 22 ON / OFF is pivotally supported, and a brake detection lever 25 that is linked to the locking / unlocking detection lever is also pivotally supported next to it.

[0048] That is, in the embodiment, the arc-shaped engagement portion 25a of the brake detection lever 25 is connected (engaged) with the pin-shaped third engagement portion 24c of the lock / unlock detection lever 24, so that the fingertip-shaped engagement portion 25b protruding on the opposite side from the pin-shaped third engagement portion 24c can selectively turn the switch 23 ON / OFF.

[0049] Furthermore, although it is secondary in relation to the main inventive subject of the present invention, the engagement structure between the arcuate engagement portion 25a of the brake detection lever 25 and the gum gear 35 will now be briefly described with reference to Figures 11 and 12. The gum gear 35 has an arcuate protrusion 60 formed like a protruding wall along part of the annular outer groove 47, and the outer surface of the arcuate protrusion 60 and the sloped engagement surfaces formed on the end of the arcuate protrusion 60 can be engaged with and disengaged from the arcuate engagement portion 25a of the brake detection lever 25. By employing this type of engagement structure, the control unit can receive a braking signal from the brake detection lever 25 with optimal timing and prevent the gum gear 35 from rotating too much.

[0050] In addition, if the lock / unlock detection lever 24 and the brake detection lever 25 are not connected together via a male engagement and a female engagement portion, it is desirable to appropriately provide a return spring on the horizontal axis of the brake detection lever 25 to return the brake detection lever to its original position.

[0051] <Additional Notes> In the embodiment, the eccentric cam groove 42 is an annular or annular recessed groove formed on one side of the cam gear 35, but of course the recessed groove may be a notched groove. Also, the switches 21 and 22 that detect locking or unlocking may be provided independently as in the embodiment, but they can also be controlled by, for example, a single switch (controlling by regarding ON=locked and OFF=unlocked, and using a contact switch). Therefore, it is optional whether the switch is a single switch or multiple switches. [Industrial Applicability]

[0052] The present invention is applied to cases where a door is attached to the free end of a door opening of a fixture, and a door closer, an automatic door opening device, etc. is attached to the door opening or door frame, for example, to open the door easily or automatically. [Explanation of symbols]

[0053] X...electric latch lock, 1...door frame, 2...door, 3...lockbox, 4...front, 5...receive seat, 6...inverting latch, 7...Latch frame, 8A, 8B...Locking pieces, 9...Fixed axis, 10...return spring, 11...Latch receiver, 12...reversal prevention member, 15...Movable connection shaft, 19...Mounting base plate, 20...Horizontal support plate, 21...first switch, 22...second switch, 23...switch, 24... Lock / unlock lever, 25... Brake lever, 26...control unit, 27...power supply, 28...electric motor, 31... power transmission means, 32... gears, 35...cam gear, 36...gear shaft, 37...center shaft, 41...power conversion mechanism, 42...eccentric cam groove, 43...arc-shaped protrusion portion, 45... engaging pin, 46... roller, 47...annular outer groove, 48...outer inclined surface, 49...inner inclined surface, 50...slider, 51...wide plate-shaped portion, 52...pressure portion, 53...Engagement portion.

Claims

1. An electric latch lock comprising: a reverse latch whose tip protrudes from the front of the lock box; a reverse prevention member including a locking piece that prevents the reverse latch from reversing; an electric motor whose start, rotation direction and stop are controlled by a control unit; a power transmission means including gears that transmit the driving force of the electric motor; a cam gear that interfaces with the power transmission means; a power conversion mechanism consisting of an eccentric cam groove formed in the cam gear and an engagement pin that engages with the eccentric cam groove; and a slider that converts the rotational motion of the cam gear into linear motion; when the electric motor is started during unlocking, the slider advances toward the reverse latch via the power transmission means and power conversion mechanism, releasing the blocked state of the locking piece against the reverse latch.

2. In the electric latch lock of claim 1, the eccentric cam groove of the cam gear is formed along an arc-shaped protrusion portion that gradually bulges circumferentially from a part of the outer surface of the central shaft cylinder portion of the cam gear, like the appearance of an ammonite, and when unlocking, when the cam gear rotates in one direction based on the central axis, the engagement pin gradually moves away from the central shaft cylinder portion along the arc-shaped protrusion portion.

3. In the electric latch lock of claim 1, one or more switches are arranged within the lock box to detect the locked and / or unlocked state of the lock body, and the control unit turns off the power supplied to the electric motor after obtaining the locking signal or unlocking signal detected by the switch.

4. In the electric latch lock of claim 3, the plurality of switches include a switch for braking the electric motor, and after the control unit acquires a braking signal detected by the switch for braking the electric motor, it reduces the rotational force of the electric motor to brake the electric motor.

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