Patent Publication Number: US-2022220770-A1

Title: Automatically resettable passive swing bolt lock

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a lock, and more particularly to an automatically resettable passive swing bolt lock. 
     2. Description of the Prior Art 
     With the improvement of economic level, electronic locks are widely used in homes, hotels, enterprises, public places and other places. Passive locks are more and more widely used. The technique of passive locks is enhanced. However, conventional passive locks have the following shortcomings: (1) it is inconvenient to lock the conventional passive locks; (2) the conventional passive locks are large in size, high in power consumption, and require high motor performance; (3) the conventional passive locks need to be reset by powering on the motor; (4) the conventional passive locks have a complex structure, high cost, and high performance requirements for various parts. 
     SUMMARY OF THE INVENTION 
     The primary object of the present invention is to provide an automatically resettable passive swing bolt lock, which has a simple structure and good safety. 
     In order to achieve the above object, the present invention adopts the following technical solutions. 
     An automatically resettable passive swing bolt lock consists of a lock body and a key. The key is configured to be inserted into a locking hole of the lock body. 
     The lock body comprises a lock housing, a rotary compartment, a lock cover, a reset spring, a pin spring, a pin, a lock body PCB, a motor, a cam, a reset pusher block, a steel ball, two locking contacts, and a grounding conductor. The lock cover is buckled on the rotary compartment. A rotary compartment internal cavity is formed between the lock cover and the rotary compartment. The rotary compartment with the lock cover is rotatably fitted in the lock housing. An outer end of the rotary compartment is provided with two conductive holes. The cam is fixedly sleeved on an output shaft of the motor. The motor is fixedly fitted in the rotary compartment internal cavity. The two locking contacts are movably fitted in the two conductive holes of the rotary compartment. Outer ends of the locking contacts face a key hole of the lock housing. Inner ends of the locking contacts are electrically connected to the motor. The reset pusher block is movably fitted in the rotary compartment internal cavity to be moved back and forth in a longitudinal direction. An outer end face of the reset pusher block faces the key hole of the lock housing. An inner end of the reset pusher block is movably fitted with the cam. The reset spring is disposed between the reset pusher block and a wall of the rotary compartment internal cavity. An upper portion of the pin is movably fitted on the lock cover along a lateral direction. A lower end of the pin abuts against the cam. The pin spring is sleeved on the pin. Two ends of the pin spring lean against the lock cover and the cam, respectively. The steel ball is movably fitted in the rotary compartment internal cavity, and the steel ball is located on a side wall of the key hole of the rotary compartment. Both the lock body PCB and the grounding conductor are installed in the rotary compartment internal cavity. The lock body PCB is electrically connected to the motor and the locking contacts. The grounding conductor is in contact with the reset pusher block. 
     The cam has a cam body, a cam engaging block, a cam limiting block, a cam inclined surface, a cam cylindrical surface, and a cam arcuate groove. The cam limiting block extends outwardly from an outer end of the cam body. The cam arcuate groove is formed on an outer wall of the cam body. The cam engaging block extends outwardly from a side wall of the cam body. The cam inclined surface is formed on an inner end of the cam body. The cam cylindrical surface protrudes inwardly from the cam inclined surface. 
     The reset pusher block is an L-shaped member. The L-shaped member has a vertical section. An inner side wall of the vertical section is provided with an arcuate sleeve. The arcuate sleeve has an inclined end face matched with the cam cylindrical surface of the cam. 
     The automatically resettable passive swing bolt lock further comprises a fixing plate, a tongue, and a tongue nut. The fixing plate is fitted in the rotary compartment internal cavity. The fixing plate is movably sleeved on an outer end of the pin. The tongue is fixedly connected to an inner end of the rotary compartment through the tongue nut. 
     The key includes a key housing, a key head, a guide plate, two return pins, a grounding spring, a battery, a grounding elastic plate, an electrode elastic plate, and a key PCB. The key head is fixed at a front end of the key housing. A front end of the key head is formed with a steel ball groove for the steel ball in the lock body to be engaged therein. The guide plate is movably fitted in the key head. The return pins are movably inserted in guide holes of the key head. The grounding spring is sleeved on the corresponding return pin. Two ends of the grounding spring are respectively pressed against a flange of the corresponding return pin and the key housing to provide a spring force to push the corresponding return pin outwardly. The battery is installed in the key housing. The grounding elastic plate and the electrode elastic plate are installed on an inner wall of the key housing. The grounding elastic plate and the electrode elastic plate are in contact with two electrodes of the battery respectively, and are electrically connected to the key PCB and the two return pins through wires. 
     After adopting the above solutions, the lock body of the present invention comprises a lock housing, a rotary compartment, a lock cover, a reset spring, a pin spring, a pin, a lock body PCB, a motor, a cam, a reset pusher block, a steel ball, two locking contacts, and a grounding conductor. The rotary compartment is installed in the lock housing. The lock body PCB, the motor and the cam are all installed in the rotary compartment internal cavity formed between the lock cover and the rotary compartment. It has the advantages of small size, simple structure, and low power consumption of the motor. 
     Embodiments of the present invention will now be described, by way of example only, with reference to the accompanying drawings. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a perspective view of the present invention; 
         FIG. 2  is an exploded view of the present invention; 
         FIG. 3  is a cross-sectional view of the present invention in a locked state; 
         FIG. 4  is a side view of the present invention in a locked state; 
         FIG. 5  is a cross-sectional view of the present invention in an unlocked state; 
         FIG. 6  is a side view of the present invention in an unlocked state; 
         FIG. 7  is a perspective view of the reset pusher block of the present invention; 
         FIG. 8  is a perspective view of the cam of the present invention; and 
         FIG. 9  is an exploded view of the key of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     As shown in  FIG. 1 , the present invention discloses an automatically resettable passive swing bolt lock consisting of a lock body  1  and a key  2 . The key  2  is configured to be inserted into a locking hole of the lock body  1 . 
     As shown in  FIG. 2  through  FIG. 6 , the lock body  1  comprises a lock housing  11 , a rotary compartment  12 , a lock cover  13 , a reset spring  14 , a pin spring  15 , a pin  16 , a reset pusher block  17 , a motor  18 , a cam  19 , a lock body PCB  110 , a fixing plate  111 , a steel ball  112 , two locking contacts  113 , a grounding conductor  114 , a tongue  115 , and a tongue nut  116 . 
     The lock cover  13  is buckled on the rotary compartment  12 . A rotary compartment internal cavity is formed between the lock cover  13  and the rotary compartment  12 . The rotary compartment  12  with the lock cover  13  is rotatably fitted in the lock housing  11 . The outer end of the rotary compartment  12  is provided with two conductive holes  121 . The cam  19  is fixedly sleeved on an output shaft of the motor  18 . The motor  18  is fixedly fitted in the rotary compartment internal cavity. The two locking contacts  113  are movably fitted in the two conductive holes  121  of the rotary compartment  12 . The outer ends of the locking contacts  113  face a key hole on the lock housing  11 . The inner ends of the locking contacts  113  are electrically connected to the motor  18 . The reset pusher block  17  is movably fitted in the rotary compartment internal cavity to be moved back and forth in a longitudinal direction. The outer end face of the reset pusher block  17  faces the key hole of the lock housing  11 . The inner end of the reset pusher block  17  is movably fitted with the cam  19 . The reset spring  14  is disposed between the reset pusher block  17  and the wall of the rotary compartment internal cavity. The upper portion of the pin  16  is movably fitted on the lock cover  13  along a lateral direction. The lower end of the pin  16  abuts against the cam  19 . The pin spring  15  is sleeved on the pin  16 . Two ends of the pin spring  15  lean against the lock cover  13  and the cam  19 , respectively. The steel ball  112  is movably fitted in the rotary compartment internal cavity, and the steel ball  112  is located on the side wall of the key hole of the rotary compartment  12 . Both the lock body PCB  110  and the grounding conductor  114  are installed in the rotary compartment internal cavity. The lock body PCB  110  is electrically connected to the motor  18  and the locking contacts  113 . The grounding conductor  114  is in contact with the reset pusher block  17 . The fixing plate  111  is fitted in the rotary compartment internal cavity. The fixing plate  111  is movably sleeved on the outer end of the pin  16 . The tongue  115  is fixedly connected to the inner end of the rotary compartment  12  through the tongue nut  116 . 
     It should be noted that the grounding conductor  114  may be in different manners, as long as the key  2  is inserted to form a loop with the lock body PCB 110 . For example, it may be connected to the lock housing  11  with a circuit board, and the lock housing  11  is in contact with the key  2 . Alternatively, the reset pusher block  17  has an inclination. Only when the key  2  is inserted, the reset pusher block  17  is to be in contact with the grounding conductor  114 , not having to be in contact all the time. 
     As shown in  FIG. 8 , the cam  19  has a cam body  191 , a cam engaging block  192 , a cam limiting block  193 , a cam inclined surface  194 , a cam cylindrical surface  195 , and a cam arcuate groove  196 . The cam limiting block  193  extends outwardly from the outer end of the cam body  191 . The cam arcuate groove  196  is formed on the outer wall of the cam body  191 . The cam engaging block  192  extends outwardly from the side wall of the cam body  191 . The cam inclined surface  194  is formed on the inner end of the cam body  191 . The cam cylindrical surface  195  protrudes inwardly from the cam inclined surface  194 . 
     As shown in  FIG. 7 , the reset pusher block  17  is an L-shaped member. The L-shaped member has a vertical section  171 . The inner side wall of the vertical section  171  is provided with an arcuate sleeve  172 . The arcuate sleeve  172  has an inclined end face  173 . The inclined end face  173  of the arcuate sleeve  172  cooperates with the cam cylindrical surface  195  of the cam  19  to be engaged with or disengaged from each other. 
     As shown in  FIG. 9 , the key  2  includes a key housing  21 , a key head  22 , a guide plate  23 , two return pins  24 , a grounding spring  25 , a battery  26 , a grounding elastic plate  27 , an electrode elastic plate  28 , and a key PCB  29 . The key head  22  is fixed at the front end of the key housing  21 . The front end of the key head  22  is formed with a steel ball groove  221  for the steel ball  112  in the lock body  1  to be engaged therein. The guide plate  23  is movably fitted in the key head  22 . The return pins  24  are movably inserted in guide holes of the key head  22 . The grounding spring  25  is sleeved on the corresponding return pin  24 . Two ends of the grounding spring  25  are respectively pressed against a flange  241  of the corresponding return pin  24  and the key housing  21  to provide a spring force to push the corresponding return pin  24  outwardly. The battery  26  is installed in the key housing  21 . Both the grounding elastic plate  27  and the electrode elastic plate  28  are installed on the inner wall of the key housing  21 . The grounding elastic plate  27  and the electrode elastic plate  28  are in contact with two electrodes of the battery  26  respectively, and are electrically connected to the key PCB  29  and the two return pins  24  through wires. 
     The key housing  21  is composed of a key top cover  211 , a key bottom cover  212  and a cover body  213 . The key top cover  211  and the key bottom cover  212  are fixed to the top and the bottom of the cover body  213 , respectively. 
     The working principle of the present invention is described below. 
     When the key  2  is inserted in the lock body  1 , the key head  22  pushes the reset pusher block  17  to complete the connection of the grounding terminal. The grounding conductor  114  is always in contact with the reset pusher block  17 . While the reset pusher block  17  is pushed in place, the return pins  24  on the key  2  are in contact with the locking contacts  113  of the lock body  1 . When the reset pusher block  17  is in place, the inclined end face  173  of the arcuate sleeve  172  of the reset pusher block  17  is separated from the cam inclined surface  194  of the cam  19  to make the restriction invalid. The key  2  supplies power to the lock body  1  and drives the motor  18  after the signal transmission is completed. After the motor  18  drives the cam  19  to rotate 90 degrees, the cam limiting block  193  is limited by a limiting surface  123  of the rotary compartment  12  and the cam arcuate groove  196  of the cam  19  is aligned with the pin  16 , so that the restriction of the pin  10  fails. At this time, the key  2  is turned to drive the rotary compartment  12 . The pin  16  has a free displacement toward the axis due to the failure of restriction of the cam  19 . When the rotary compartment  12  is rotated, the head of the pin  16  slides relative to the arcuate groove on the inner wall of the lock housing  11  to move the pin  16  toward the axis, thereby failing the rotation restriction inside the lock and unlocking. When the key  2  is inserted, the steel ball  112  slides into the steel ball groove  221  of the key head  22 . After the key  2  is turned, the steel ball  112  is engaged in the steel ball groove  221 , so that the key  2  cannot be pulled out. When the key  2  is turned back to the initial position, the pin  16  is reset by the pin spring  15 , the restriction of the steel ball  112  is invalid, and the key  2  is pulled out. The reset pusher block  17  is reset by the reset spring  14  when the key  2  is pulled out. The inclined end face  173  of the reset pusher block  17  is in cooperation with the cam inclined surface  194  of the cam  19  to reset the cam  19 . After the cam  19  is reset, the restriction of the pin  16  becomes effective, and the lock is locked. The arcuate sleeve  172  of the reset pusher block  17  is fitted with the cam cylindrical surface  195  of the cam  19  to ensure that the center of the inclined end face  173  of the reset pusher block  17  coincides with the axis of the cam  19 . The inner end face of the cam  19  coincides with the vertical section  171  of the reset pusher block  17  to ensure that the cam  19  will not be tilted due to the matching relationship between the elastic force of the reset spring  14  and the inclined end surface  173 . The cam engaging block  192  cooperates with the limiting surface  123  of the rotary compartment  12  to prevent the motor  18  from turning incorrectly and failing to unlock. A rotary compartment surface  122  cooperates with the circumferential surface of the motor  4  to prevent that when the rotary compartment  12  is twisted violently, the pin  16  is against the cam  19  and the cam  19  is displaced to cause a false locking. 
     Although particular embodiments of the present invention have been described in detail for purposes of illustration, various modifications and enhancements may be made without departing from the spirit and scope of the present invention. Accordingly, the present invention is not to be limited except as by the appended claims.