Patent Abstract:
The invention relates to an electromagnetic doorlock with shock detection and power saving device comprises an electromagnet assembly and a corresponding adsorption assembly. The electromagnet assembly is connected to a shock detection module and the adsorption assembly has a suppressing unit to abut the shock detection module. When the door is opened, the electromagnet assembly does not supply power; when the door is closed, the electromagnet assembly with electromagnetic attraction adsorbs the adsorption assembly and the suppressing unit suppresses the shock detection module. That is, the electromagnetic doorlock usually stays in a low-energy adsorption state; however, when a shock detection module is triggered, the electromagnetic doorlock returns to normal lock state for achieving power saving effect and control of the external force detection improvement.

Full Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The invention relates to an electromagnetic doorlock, particularly to the electromagnetic doorlock with shock detection and power saving device. 
     2. Description of the Related Art 
     In the access control monitoring system, the use of an electromagnetic door lock has been very popular. The electromagnetic door lock  10  as shown in  FIG. 1  provides an electric magnet  11  mounted on a door frame  13  and an adsorption plate  12  mounted on a corresponding position of a door plate  14 . When the electric magnet  11  is energized to produce electromagnetic attraction and adsorb the adsorption plate  12 , the electromagnetic door lock  10  forms in a lock state. When the electric magnet  11  is de-energized and the adsorption plate  12  detaches from the electric magnet  11 , the electromagnetic door lock  10  then forms in an unlock state. The above features are disclosed in U.S. Pat. No. 4,352,028. 
     Normally, the power consumption of the electromagnetic door lock  10  of the DC power is about tens of watts. If 12 volts of DC power is supplied, the consumption current maintains hundreds of mill-amperes (mA); thus, the electromagnetic door lock  10  requires a lot of electrical energy. 
     It is considerable that the safety monitoring system of the electromagnetic door lock requires practical applicability and controllability; therefore, energy saving design requires further improvement. 
     SUMMARY OF THE INVENTION 
     It is a primary object of the present invention to provide an electromagnetic doorlock with shock detection and power saving device, which usually stays in a low-energy adsorption state; however, when a shock detection module is triggered, the electromagnetic doorlock returns to normal lock state for achieving power saving and access control security effects. 
     It is a second object of the present invention to provide an electromagnetic doorlock with shock detection and power saving device having an adsorption plate with buffering displacement design for an electric magnet to have sufficient time to resume operation to ensure the security of access control. 
     In order to achieve the above objects, the present invention includes an electromagnetic doorlock with shock detection and power saving device according to claim  1 . 
     Based on the features disclosed, the electromagnet assembly is arranged on a door frame and the adsorption assembly is correspondingly arranged on the door plate and the electromagnet assembly has a containing room with a cover at an opening thereof and the cover has a mounted hole thereon for mounting the shock detection module. 
     Further, the shock detection module further includes: the plate having a post hole with an upward opening at a center thereof and a hollow portion at an inner side thereof; a shaft having a flange at a middle section and a small spring arranged on a lower section thereof and arranged in the post hole; a positioning sleeve having a hook body at a side thereof for fixing on a fixed hole arranged at a periphery of the post hole and corresponding to the post hole has a through hole for arranging an upper section of the shaft; a recessed flexible body across set on the elastic member and having a recessed center corresponding to a top of the shaft; and an electrical trigger arranged on the recessed flexible body and corresponding to a trigger area at a bottom surface of the shock sensor. In the preferred embodiment, the shock sensor is composed of a G-sensor. 
     Furthermore, the suppressing unit includes: a base having a recessed surface with a screw hole in a center thereof and an abutment button having a front face corresponding to the abutment body of the shock detection module and a bottom face with a screw for screwing to the screw hole to adjust a height between the abutment button and a surface of the base. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a schematic view of a conventional electromagnetic door lock; 
         FIG. 2  is a perspective view of the separation of the present invention; 
         FIG. 3  is a perspective view of the adsorption and abutment of the present invention; 
         FIG. 4  is a perspective view of the present invention, illustrating the disassembly of the electromagnet assembly; 
         FIG. 5  is a perspective view of the present invention, illustrating the assembly of the electromagnet assembly; 
         FIG. 6  is a perspective view of the present invention, illustrating the disassembly of the adsorption assembly and suppressing unit; 
         FIG. 7  is a perspective view of the present invention, illustrating the assembly of the adsorption assembly and suppressing unit; 
         FIG. 8  is a sectional view of the present invention, illustrating the separation of the electromagnet assembly and adsorption assembly; 
         FIG. 9  is a sectional view of the present invention, illustrating the abutment of the electromagnet assembly and adsorption assembly; 
         FIG. 9A  is a schematic view of the present invention, illustrating the electromagnet assembly and adsorption assembly are to be separated; 
         FIG. 10  is an enlarged view of part A of the  FIG. 8 ; 
         FIG. 11  is an enlarged view of part B of the  FIG. 9 ; and 
         FIG. 12  is a control block view of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     With reference to  FIGS. 2 through 12 , the present invention discloses an electromagnetic doorlock  60  comprising an electromagnet assembly  20  and an adsorption assembly  30 . In the embodiment as shown in  FIGS. 8 and 9 , the electromagnet assembly  20  is mounted on a door frame  13  and the adsorption assembly  30  is correspondingly mounted on a door plate  14 . The electromagnet assembly  20  may be mounted on a door plate  14  and the adsorption assembly  30  may be correspondingly mounted on a door frame  13 . However, the internal structure and external power connection method of the electromagnet assembly and adsorption assembly are prior art and thus will not be described in details here. 
     The main features of the present invention comprise the electromagnet assembly  20  electronically connected to a shock detection module  40  and the adsorption assembly  30  having a suppressing unit  50  at a side thereof. The electromagnet assembly  20  includes a case  21  and an electric magnet  22  arranged in the case  21 . The electric magnet  22  includes a core and a coil around the core to provide an electromagnetic attraction and the case  21  may include a resin coated around the electric magnet  22  or an outer housing; however, it is a prior art and thus will not be described in details here. In the preferred embodiment as shown in  FIG. 4 , the case  21  includes a containing room  23  arranged at a side of the electric magnet  22 ; the containing room  23  includes a cover  24  at an opening thereof; the cover  24  includes a mounted hole  25  thereon. Moreover, the containing room  23  may be an independent molding structure mounted on the electromagnet assembly  20  or may be integrally molded with the electromagnet assembly  20 . In the embodiment as shown in  FIG. 6 , the adsorption assembly  30  has a mounted base  31  in a U-shape for placing an adsorption plate  32 . The mounted base  31  may be directly molded on the door plate  14 . The structure of the adsorption assembly  30  will be described hereafter. 
     With the reference to  FIG. 4 , the shock detection module  40  is mounted on the mounted hole  25 . The shock detection module  40  may be mounted at a predetermined position of a periphery of the electromagnet assembly  20 . In the embodiment, the shock detection module  40  includes: a plate  41 , a shaft  414 , a positioning sleeve  417 , an elastic member  42 , a recessed flexible body  47 , a shock sensor  43 , an electrical trigger  48 , an abutment body  44  and a seat  45 . The plate  41  is upward mounted at a bottom of the mounted hole  25  and fixed by a screw  413  and the base  41  may be integrally molded with the cover  24 . The shaft  414  arranged in a post hole  411  includes a flange  415  at a middle section and a small spring  416  arranged on a lower section thereof. The positioning sleeve  417  includes a hook body  419  at a side thereof for fixing on a fixed hole  420  arranged at a periphery of the post hole  411  and the positioning sleeve  417  corresponding to the post hole  411  has a through hole  418  in a middle thereof for arranging an upper section of the shaft  414 . The elastic member  42  is mounted on the positioning sleeve  417  and the elastic member  42  may be a spring. The recessed flexible body is  47  across set on the elastic member  42  and has a recessed center contacting with the shaft  414  and is push and moved upward by the shaft  414 . The electrical trigger  48  is mounted on the recessed flexible body  47  and the shock sensor  43  may be set as a kind of circuit board module and has a trigger zone  433  on the recessed flexible body  47  and the trigger zone  433  has a bottom corresponding to the electrical trigger  48  and is connected to a wire  432 . The wire  432  has a reserved length in a hollow portion  412  of the base  41  and an end arranged in the containing room  23  and electrically connected to a control circuit  49 . The abutment body  44  mounted on the shock sensor  43  has a protrusion portion  441  and a positioning flange  442  at a periphery thereof. The seat  45  mounted on the mounted hole  25  includes an axial through hole  46  for the abutment body  44  to be axially telescoped therein and the telescopic abutment body  44  drives the shock sensor  43  to provide an upward elastic force for the abutment body  44  by the elastic member  42 . 
     With the referenced to  FIG. 10 , the seat  45  has a bottom inserted in the mounted hole  25  and a positioning surface  451  at a periphery of the axial through hole  46  for the positioning flange  442  to be abutted when the protrusion portion  441  of the abutment body  44  is upward pushed by the elastic body  42 . 
     With the referenced to  FIGS. 6 and 7 , the adsorption assembly  30  mounted at a front side of the electromagnet assembly  20  comprises a mounted base  31 , a adsorption plate  32  corresponding to the electric magnet  22  arranged an inner side of the mounted base  31  and has a spot-faced hole  321 . The adsorption plate  32  is locked on the mounted base  31  from an inner side thereof by the spot-faced hole  321  and a bolt  33  and a spring  34  is mounted on the bolt  33  for having an elastic displacement space between the inner side of the adsorption plate  32  and the mounted base  31 . In another embodiment, the adsorption plate  32  may be mounted on a door plate  14 . 
     A suppressing unit  50  is mounted on a periphery of the adsorption assembly  30 . In the embodiment, the suppressing unit  50  is fixed at a side of the adsorption assembly  30  and includes a base  51  having a recessed surface  52  with a screw hole  53  in a center thereof and an abutment button  54  having a front face corresponding to the abutment body  44  of the shock detection module  40  and a bottom face with a screw  55  for screwing to the screw hole  53  to adjust a height between the abutment button  54  and a surface of the base  51  and pressed degree between the abutment button  54  and the abutment body  44  as shown in  FIG. 11 . Moreover, a resilient positioning member  511  as shown in  FIG. 7  is mounted at a side of the abutment button  54  of the base  51 . The resilient positioning member  511  may be an elastic piece or a flexible steel ball. 
     With referenced to  FIGS. 9 ,  11  and  12 , the control circuit  49  is arranged in the containing room  23  of the electromagnet assembly  20  and an end thereof is connected to an external power  70  and another end is electronically connected to the electric magnet  22  for the power supply to be controlled and sent to the electric magnet  22 . 
     Based on the features disclosed, when the door plate  14  is opened, the abutment button  54  of the suppressing unit  50  does not contact with the abutment body  44  on the door frame  13  and the control circuit  49  does not supply the normal power to the electric magnet  22 . When the door plate  14  and the door frame  13  are closed together, the abutment button  54  of the suppressing unit  50  presses to the abutment body  44  of the shock detection module  40  and the abutment body  44  drives the shock sensor  43  inward displaced for the trigger zone  443  to contact with the electrical trigger  48  on the recessed flexible body  47  in order to trigger the control circuit  49  controlling the electric magnet  22  adsorbing the adsorption plate  32  to be in a lock state. After the door plate  14  is still, the present invention goes into a low power adsorption state. In the embodiment, the electrical trigger  48  may be any conductive material which can trigger the trigger zone  433 . With the referenced to  FIG. 11 , the shaft  414  is upward push to the recessed flexible body  47  by a small spring  416 . 
     The present invention provides the shock detection module  43  composed of the shock sensor  43  as a sensing member to sense the external environment change. In the preferred embodiment, the shock sensor  43  may be composed of an acceleration sensor which is called G-sensor hereafter. The G-sensor senses objects in a motion state generating the acceleration of gravity in a three-axis space and so-called a linear accelerometer. The G-sensor can sense the minute changes in the physical quantity, such as displacement and vibration. The shock sensor  43  is arranged on the spring  42 ; therefore, once the door plate  14  has a little displacement, the shock detection module  40  immediately senses the shock and trigger the control circuit  49  in a very short time to supply the normal power to the electric magnet  22  and to be in a lock state. 
     Therefore, the present invention provides the shock sensor  43  to link to the elastic member  42  such that when the door plate  14  is instantly displaced, the shock sensor  43  rapidly reacts through the elastic force of the elastic member  42 ; before the door plate  14  has been pushed and opened, the present invention returns to normal current supply, achieving the desired safety purpose. If the electromagnetic door lock  60  requires 1200 pounds of electromagnetic adsorption to stay in the lock state, the electromagnetic door lock  60  requires 500 mA current. Moreover, to maintain normal power supply for 24 hours, the power consumption is considerable. For this reason, the present invention provides small current such as 100 mA for the electric magnet  22  when the door plate  14  is still and closed such that the electromagnetic door lock  60  produces small adsorption to adsorb the adsorption plate  32 . When people push or destroy the door, the shock sensor  43  reacts rapidly to return to the normal power supply and stay in a lock state with normal current, achieving access control security and saving power. 
     Moreover, the present invention provides the adsorption assembly  30  to assist the shock detection module  40  wherein the mounted base  31  is locked on the door plate  14  and the adsorption plate  32  corresponding to the electric magnet  22  is boned contact. With the referenced to  FIG. 9 , the electric magnet  22  usually maintains basic adsorption with low power. With the referenced to  FIG. 9A , when the door plate  14  is pushed, the adsorption plate  32  is still bonded with the electric magnet  22  and the mounted base  31  is displaced together with the door plate  14  for a small distance D. The spring  34  in the spot-faced hole  321  provides a displacement buffering function such that when the adsorption assembly  30  contacts with the door plate  14 , there is enough time for the control circuit  49  sends the normal current to the electric magnet  22  in order to achieve the safety purpose. 
     Although particular embodiments of the 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 invention. Accordingly, the invention is not to be limited except as by the appended claims.

Technology Classification (CPC): 4