Abstract:
The invention relates to an electromagnetic doorlock with button detection and power saving device comprises an electromagnet assembly and a corresponding adsorption assembly. The electromagnet assembly is connected to a button detection module and the adsorption assembly has a pressing member to abut the button detection module. When the door is closed, the electromagnet assembly with electromagnetic attraction attracts the adsorption assembly and the pressing member presses the button detection module. That is, the electromagnetic doorlock usually stays in a low-energy attraction state; however, when the button detection module is triggered, the electromagnetic doorlock returns to a normal lock state for achieving power saving effect and control of the external force detection improvement.

Description:
BACKGROUND OF THE INVENTION 
       [0001]    1. Field of the Invention 
         [0002]    The invention relates to an electromagnetic doorlock, particularly to the electromagnetic doorlock with button detection and power saving device. 
         [0003]    2. Description of the Related Art 
         [0004]    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  discloses an electric magnet  11  mounted on a door flame  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 to attract the adsorption plate  12 , the electromagnetic door lock  10  forms 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. 4,652,028. 
         [0005]    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. 
         [0006]    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 
       [0007]    It is a primary object of the present invention to provide an electromagnetic doorlock with button detection and power saving device, which usually stays in a low-energy adsorption state; however, when a button detection module is triggered, the electromagnetic doorlock returns to normal lock state for achieving power saving and access control security effects. 
         [0008]    It is a second object of the present invention to provide an electromagnetic doorlock with button 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. 
         [0009]    In order to achieve the above objects, the present invention includes an electromagnetic doorlock with button detection and power saving device according to claim  1 . 
         [0010]    Based on the features disclosed, the button detection module further includes an elastic member arranged on the flexible body, an abutment body arranged on the elastic member and having a protrusion portion and a positioning flange at a periphery thereof and a seat fixed on the base and having an axial through hole for containing the abutment body and axially telescoping to provide an upward elastic force for the abutment body by the elastic member. 
         [0011]    Further, the electromagnet assembly is arranged on a door flame and the adsorption assembly is correspondingly arranged on the door plate; the electromagnet assembly has a containing room with a cover at an opening thereof; the cover has a mounted hole thereon and the button detection module is mounted on the mounted hole. 
         [0012]    Further, the seat of the button detection module has a positioning surface at a periphery of the axial through hole for the positioning flange to be abutted when the protrusion portion of the abutment body is upward pushed by the elastic member. 
         [0013]    Further, the pressing member includes: a base body having a recessed surface with a second screw hole at a center thereof and an abutment button having a front side facing to the abutment body of the button detection module and a bottom surface with a second screw for screwing to the second screw hole to adjust a height between the abutment button and a surface of the base body. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0014]      FIG. 1  is a schematic view of a conventional electromagnetic door lock; 
           [0015]      FIG. 2  is a perspective view of the separation of the present invention; 
           [0016]      FIG. 3  is a perspective view of the abutment of the present invention; 
           [0017]      FIG. 4  is a perspective view of the present invention, illustrating the disassembly of the electromagnet assembly; 
           [0018]      FIG. 5  is a perspective view of the present invention, illustrating the assembly of the electromagnet assembly; 
           [0019]      FIG. 6  is a perspective view of the present invention, illustrating the disassembly of the adsorption assembly and pressing member; 
           [0020]      FIG. 7  is a perspective view of the present invention, illustrating the assembly of the adsorption assembly and pressing member; 
           [0021]      FIG. 8  is a sectional view of the present invention, illustrating the separation of the electromagnet assembly and adsorption assembly; 
           [0022]      FIG. 8A  is an enlarged view of  8 A in  FIG. 8 ; 
           [0023]      FIG. 9  is a sectional view of the present invention, illustrating the abutment of the electromagnet assembly and adsorption assembly; 
           [0024]      FIG. 9A  is an enlarged view of  9 A in  FIG. 9 ; 
           [0025]      FIG. 10  is a schematic view of the present invention, illustrating the electromagnet and adsorption assemblies are to be separated; 
           [0026]      FIG. 10A  is an enlarged view of  10 A in  FIG. 10 ; and 
           [0027]      FIG. 11  is a control block view of the present invention. 
       
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
       [0028]    With the referenced to  FIGS. 2 through 11 , 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 flame  13  and the adsorption assembly  30  is correspondingly mounted on a door plate  14 . The electromagnet assembly  20  may also be mounted on a door plate  14  and the adsorption assembly  30  may be correspondingly mounted on a door flame  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. 
         [0029]    The present invention is characterized in that the electromagnet assembly  20  is electronically connected to a button detection module  40  and the adsorption assembly  30  has a pressing member  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. 
         [0030]    In the preferred embodiment as shown in  FIG. 4 , the case  21  has a containing room  23  arranged at a side of the electric magnet  22 ; the containing room  23  has 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. 
         [0031]    With the reference to  FIG. 4 , the button detection module  40  is mounted on the mounted hole  25 . The button detection module  40  may also be mounted at a predetermined position of a periphery of the electromagnet assembly  20 . In the embodiment, the button detection module  40  includes: a base  41 , a trigger circuit  43  and a trigger detector  47 . The base  41  is upward mounted at a bottom of the mounted hole  25  and fixed by a first screw  413  and the base  41  includes a through hole  411  and several first screw holes  412 . 
         [0032]    In another applicable embodiment, the base  41  may be integrally molded with the cover  24 . The trigger circuit  43  may be a circuit board arranged on the base  41  and has an electrical contact  433  on a surface thereof and a side thereof is connected to a wire  432  and a control circuit  49 . The trigger detector  47  has a flexible body  471  elastically maintained at a top of the electrical contact  433 . The trigger detector  47  is preferred to be made of insulating materials and to have a convex surface. The flexible body  471  can be moved axially and elastically and a bottom edge thereof corresponding to the electrical contact  433  has an electrical trigger  472 ; that is, the trigger detector  47  may be an independent telescoping button for the corresponding pressing member  50  pressing. When the electrical trigger  472  is pressed to the electrical contact  433 , 
         [0033]    In the preferred embodiment, the button detection module  40  further includes an elastic member  42  arranged on the flexible body  471 , an abutment body  44  arranged on the elastic member  42  and having a protrusion portion  441  and a positioning flange  442  at a periphery thereof and a seat  45  fixed on the base  41  and having an axial through hole  46  for containing the abutment body  44  and axially telescoping to provide an upward elastic force for the abutment body  44  by the elastic member  42 . In the embodiment, the elastic member  42  of the button detection module  40  is a spring  34  and a small spring  48  is arranged between a bottom edge of the abutment body  44  and the flexible body  471 . When the abutment body  44  is moved downward, an elastic force of the small spring  48  presses on an bottom edge of the electrical trigger  472  to contact with the electrical contact  433 . In the embodiment, the seat  45  has a bottom mounted in the mounted hole  25 . 
         [0034]    With the referenced to  FIG. 8A , the seat  45  has 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 member  42 . 
         [0035]    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 through the spot-faced hole  321  by a bolt assembly  33  and a spring  34  is mounted on the bolt assembly  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 . 
         [0036]    The pressing member  50  is mounted on a periphery of the adsorption assembly  30 . In the embodiment, the pressing member  50  is fixed at a side of the adsorption assembly  30  and includes a base body  51  having a recessed surface  52  with a second screw hole  53  at a center thereof and an abutment button  54  having a front side corresponding to the abutment body  44  of the button detection module  40  and a bottom surface with a second screw  55  for screwing to the second screw hole  53  to adjust a height between the abutment button  54  and a surface of the base body  51  and a 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 body  51 . The resilient positioning member  511  may be an elastic piece or a flexible steel ball. 
         [0037]    With referenced to  FIGS. 8 ,  9  and  11 , 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 control the power supply to the electric magnet  22 . 
         [0038]    Based on the features disclosed, when the door plate  14  is opened, the abutment button  54  of the pressing member  50  does not contact with the abutment body  44  on the door flame  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 flame  13  are closed together, the abutment button  54  of the pressing member  50  presses to the abutment body  44  of the button detection module  40  and the abutment body  44  drives the flexible body  471  downward displaced for the electrical trigger  472  to contact with the electrical contact  433  of the trigger circuit  43  in order to trigger the control circuit  49  controlling the electric magnet  22  adsorbing the adsorption plate  32  to be in a lock state. When the door plate  14  is still, the present invention goes into a low power adsorption state. In the embodiment, the electrical trigger  472  may be any conductive material which can trigger the electrical contact  433 . 
         [0039]    Moreover, the present invention provides the adsorption assembly  30  to assist the button detection module  40  wherein the mounted base  31  is locked on the door plate  14  and the adsorption plate  32  is contact with the corresponding electric magnet  22 . With the referenced to  FIG. 9 , the electric magnet  22  usually maintains basic adsorption with low power. With the referenced to  FIGS. 10 and 10A , when the door plate  14  is pushed, the adsorption plate  32  is still attracted by 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  to send the normal current to the electric magnet  22  in order to achieve the safety purpose. To achieve the same purpose, the bolt assembly and spring assembly may be installed in the electromagnet assembly to form the elastic displacement space between the inner side of the electromagnet assembly and the door flame. 
         [0040]    Therefore, the abutment body  44  and the trigger detector  47  are set to be a touchtone axial linkage such that when the door plate  14  is instantly displaced, the flexible body  471  moves upward to separate the electrical trigger  472  and the electrical contact  433  for the trigger circuit  43  rapidly reacting; before the door plate  14  has been pushed and opened, the present invention returns to normal current supply, achieving the desired safety purpose. For example, if the electromagnetic door lock  60  requires 1200 pounds of electromagnetic attraction 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 10 0mA for the electric magnet  22  when the door plate  14  is still and closed such that the electromagnetic door lock  60  produces small attraction to attract the adsorption plate  32 . When people push or destroy the door, the trigger circuit  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.