Patent Document

BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to an automatic extrusion device. 
     2. Description of the Prior Art 
     A metallic pipe has the properties of heat resistance, pressure resistance and good conductivity, so it is widely used in refrigeration plumbing, air condition plumbing, hot water pipe system or the like. When the length of the metallic pipe is not enough or the metallic pipe needs a turning, the user uses an extrusion device to extrude one end of the pipe to be in the form of a bell for connecting with another metallic pipe. The conventional extrusion device is operated manually, which consumes time and labor. In general, the metallic pipe is installed in a hidden position. It is not convenient for the user to proceed with the connection of the pipes. When there are quantities of pipe connections, the user will have a difficult task. Accordingly, the inventor of the present invention has devoted himself based on his many years of practical experiences to develop an automatic compulsion device. 
     SUMMARY OF THE INVENTION 
     The present invention is to provide an automatic extrusion device which comprises a main body, a driving unit, a first transmission unit, a second transmission unit and an extrusion unit. The main body has an accommodating room therein. The driving unit is disposed in the accommodating room for supplying power. The first transmission unit is disposed in the accommodating room and connected with the driving unit for receiving the power from the driving unit. The second transmission unit is disposed in the accommodating room. The second transmission unit comprises an inner threaded pipe, an outer threaded pipe, an action sleeve and a driving member. The inner threaded pipe is fixed in the accommodating room. One end of the outer threaded pipe has an engaging portion. The engaging portion is screwed in the inner threaded pipe. Another end of the outer threaded pipe extends out the inner threaded pipe and is formed with a stop portion. One end of the action sleeve has a connection portion to connect with the first transmission unit. Another end of the action sleeve is formed with a head. The driving member is disposed between the stop portion of the outer threaded pipe and the head of the action sleeve. The action sleeve transmits the power to the outer threaded pipe for driving the outer threaded pipe to turn in the inner threaded pipe. One end of the driving member has a slip inclined surface. Another end of the driving member has a press portion. The press portion is adapted to press an elastic member which is axially provided. The slip inclined surface of the driving member provides a slip effect when the outer threaded pipe stops running. The extrusion unit has a center shaft. One end of the center shaft has a fixing portion. The fixing portion is inserted through the inner threaded pipe and the outer threaded pipe and connected to the action sleeve. Another end of the center shaft has a coupling portion. A front end of the coupling portion is connected with a mandrel assembly. The automatic extrusion device extrudes the front end of the pipe to be in the form of a bell through the mandrel assembly. In this way, the user can extrude the pipe quickly to save time and labor for a fast connection of pipes. Through the slip inclined surface, the present invention can prevent the extrusion unit from over extrusion. The mandrel assembly can be turned continually to make the front end of the pipe round so as to beautify the interface of the pipe. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is an exploded view according to a preferred embodiment of the present invention; 
         FIG. 2  is a partially cross-sectional view according to the preferred embodiment of the present invention; 
         FIG. 3  is an exploded view of the second transmission unit of the present invention; 
         FIG. 4  is a partially enlarged and exploded view according to the preferred embodiment of the present invention; 
         FIG. 5  is a schematic view showing the preferred embodiment of the present invention when in use; 
         FIG. 6  is a schematic view showing the operation of the clamping unit of the present invention; 
         FIG. 7  is a schematic view showing the operation of the quick-release unit of the present invention; 
         FIG. 8  is a schematic view of the second transmission unit of the present invention to show the driving member before slip; 
         FIG. 9  is a schematic view of the second transmission unit of the present invention to show the driving member in a slip status; 
         FIG. 10  is another schematic view to show the second transmission unit of the present invention; and 
         FIG. 11  is a partially enlarged and exploded view according to another preferred embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Embodiments of the present invention will now be described, by way of example only, with reference to the accompanying drawings. 
     As shown in  FIG. 1  to  FIG. 3 , an automatic extrusion device  100  according to a first preferred embodiment of the present invention comprises a main body  10 , a driving unit  20 , a first transmission unit  30 , and a second transmission unit  40 . 
     The main body  10  is composed of an upper casing  11  and a lower casing  12 . The main body  10  has an accommodating room  13  between the upper casing  11  and the lower casing  12  and an opening  14  at a front end thereof. The opening  14  communicates with the accommodating room  13 . A lighting unit  15  is provided at the front end of the main body  10  close to the opening  14 . The lighting unit  15  is a light bulb or a light emitting diode. 
     The driving unit  20  is disposed in the accommodating room  13  for supplying power. The driving unit  20  comprises a motor  21 . A front end of the motor  21  is connected with a deceleration machine  22  for reducing the rotational speed of the motor  21 . A rear end of the motor  21  is connected with a control unit  23  to turn on/off the motor  21 . The control unit  23  is further connected with a battery  24  for supplying power to the motor  21 . 
     The first transmission unit  30  is disposed in the accommodating room  13  and connected with the driving unit  20  for receiving the power from the driving unit  20 . In this embodiment, the first transmission unit  30  comprises a driving gear  31  and a driven gear  32 . One end of the driving gear  31  is connected to the driving unit  20 , and another end of the driving gear  31  is fixed in the accommodating room  13  of the main body  10  through a first ball bearing  311 . Two ends of the driven gear  32  are connected with a second ball bearing  321  and a copper bearing  322 , such that the driven gear  32  is positioned next to the driving gear  31  to engage with the driving gear  31 . One side of the copper bearing  322  of the driven gear  32  is connected with a driving shaft  323 . 
     The second transmission unit  40  is disposed in the accommodating room  13 , and comprises an inner threaded pipe  41 , an outer threaded pipe  42 , an action sleeve  43 , a driving member  44 , and a thrust assembly  45 . 
     The inner threaded pipe  41  is fixed in the accommodating room  13  and located close to the opening  14 . In this embodiment, the inner treaded pipe  41  comprises an outer pipe body  411  and an inner threaded ring  412  in the outer pipe body  411 . The inside of the inner threaded ring  412  is formed with inner threads  413 . 
     One end of the outer threaded pipe  42  has an engaging portion  421 . The engaging portion  421  has outer threads  422  thereon to be screwed in the inner threaded ring  412  of the inner threaded pipe  41 . The engaging portion  421  has one end formed with a circular trough  423  and a first inclined surface  424  around the circular trough  423 . Another end of the outer threaded pipe  42  extends out the inner threaded pipe  41  and is formed with an enlarged stop portion  425 . The stop portion  425  is axially formed with an insertion trough  426  which is located close to an outer edge of the stop portion  425 . 
     The action sleeve  43  is disposed adjacent to the outer threaded pipe  42 . One end of the action sleeve  43  has a connection portion  431 . The connection portion  431  is axially formed with a connection trough  432  for connecting with the driving shaft  323  of the first transmission unit  30 . Another end of the action sleeve  43  is formed with an enlarged head  433 . The head  433  has an end formed with a recess  434  corresponding to the insertion trough  426  of the outer threaded pipe  42 . 
     The driving member  44  is disposed between the stop portion  425  of the outer threaded pipe  42  and the head  433  of the action sleeve  43 , so that the action sleeve  43  can transmit the power to the outer threaded pipe  4  for driving the outer threaded pipe  42  to turn in the inner threaded pipe  41 . One end of the driving member  44  has a slip inclined surface  441 , and another end of the driving member  44  has a press portion  442 . The press portion  442  is adapted to press an elastic member  443  which is axially provided. The slip inclined surface  441  of the driving member  44  will provide a slip effect when the outer threaded pipe  42  stops running. In this embodiment, the elastic member  443  and the press portion  442  of the driving member  44  are inserted into the recess  434  of the action sleeve  43  in sequence. The end having the slip inclined surface  441  of the driving member  44  is extended out the recess  434  and inserted into the insertion trough  426  of the outer threaded pipe  42 . 
     The thrust assembly  45  is disposed between the inner threaded pipe  41  and the stop portion  425  of the outer threaded pipe  42 . The thrust assembly  45  comprises a plurality of steel balls  451  and an annular washer  452 . In this embodiment, the inner threaded pipe  41  has one end which faces the stop portion  425  and has a plurality of holes  414  to accommodate the steel balls  451 . The annular washer  452  is disposed outside the holes  414 . 
     Referring to  FIG. 2  and  FIG. 3 , the automatic extrusion device  100  further comprises an extrusion unit  50 . The extrusion unit  50  has a center shaft  51 . One end of the center shaft  51  has a fixing portion  511 . The fixing portion  511  is inserted through the inner threaded pipe  41  and the outer threaded pipe  42  and connected to the action sleeve  43 . Another end of the center shaft  51  has an enlarged coupling portion  512 . A needle bearing  52  is fitted on the coupling portion  512 . A front end of the coupling portion  512  is connected with a mandrel assembly  53 . A second inclined surface  513  is formed between the center shaft  51  and the coupling portion  512  for reducing the friction between the coupling portion  512  and the inner threaded ring  412 . A ball washer  54 , a packing  55  and a spring  56  are provided on the center shaft  51  and accommodated in the circular trough  423  of the outer threaded pipe  42 . The spring  56  urges the ball washer  54  to lean against the coupling portion  512  of the center shaft  51 . 
     The driving member  44  has an annular limit groove  444  thereon. The head  433  of the action sleeve  43  has a coupling trough  435  at a central portion thereof for the fixing portion  511  of the center shaft  51  to be secured therein. An inner wall of the coupling trough  345  of the action sleeve  43  has a limit trough  436  which corresponds to the annular limit trough  444  and communicates with the recess  434 . The fixing portion  511  of the center shaft  51  has a limit hole  514  thereon. The limit hole  514  corresponds to the limit trough  436  and is adapted to receive a limit pin  57  therein. One end of the limit pin  57  extends out the limit hole  514  and inserts through the limit trough  436  to be located in the annular limit through  444 , such that the driving member  44  is confined in the recess  434 . 
       FIG. 4  is a partially enlarged view of the first preferred embodiment of the present invention. The automatic extrusion device  100  further comprises a quick-release unit  60  which is located at one end of the inner threaded pipe  41 , opposite to the outer threaded pipe  42 . The quick-release unit  60  is further connected with a clamping unit  70 . The quick-release unit  60  comprises an annular quick-release seat  61 . In this embodiment, the quick-release seat  61  is integrally formed with the inner threaded pipe  41 . The quick-release seat  61  has an annular inside formed with a plurality of through holes  611  and an annular fixing groove  612 . The inside of the quick-release seat  61  is provided with a plurality of positioning protrusions  613 . A spring  62 , a plurality of steel balls  63  received in the through holes  611 , a tightening ring  64  and a C-shaped ring  65  received in the annular fixing trough  612  are provided on the quick-release seat  61 . The clamping unit  70  comprises an upper clamping seat  71  and a lower clamping seat  72 . First ends of the upper clamping seat  71  and the lower clamping seat  72  are pivotally connected together, and second ends of the upper clamping seat  71  and the lower clamping seat  72  are connected with a connecting member  73 . The connecting member  73  is composed of a press handle  731  and a buckling ring  732 . One side of the clamping unit  70  has a protruding ring  74  corresponding to the quick-release seat  61 . An annular side of the protruding ring  74  has a positioning groove  741  corresponding to the steel balls  63  of the quick-release unit  60 . A distal end of the protruding ring  74  has a plurality of notches  742  corresponding to the positioning protrusions  613  for the protruding ring  74  to be positioned on the quick-release seat  61 . Referring to  FIG. 6 , the clamping unit  70  further has a clamping portion  75  which is disposed between the upper clamping seat  71  and the lower clamping seat  72  and a stop plate  76  which is disposed between the clamping portion  75  and the positioning groove  741 . 
       FIG. 5  is a schematic view of the first preferred embodiment of the present invention when in use. When the user uses the automatic extrusion device  100  to extrude a pipe  200 , the pipe  200  is first clamped on the clamping unit  70  and assembled on the automatic extrusion device  100  though the quick-release unit  60 . As shown in  FIG. 6 , the press handle  731  of the clamping unit  70  is turned counterclockwise to separate the upper clamping seat  71  and the lower clamping seat  72 , so that the pipe  200  is placed in the clamping portion  75 . The front of the pipe  200  is stopped by the stop plate  76  to position the extrusion depth, and then the press handle  731  is turned in an opposite direction to buckle the upper clamping seat  71  and the lower clamping seat  72  together through the buckling ring  732 , such that the pipe  200  is clamped on the clamping unit  70  securely. 
     Referring to  FIG. 5 , after the pipe  200  is clamped on the clamping unit  70 , the clamping unit  70  is secured on the automatic extrusion device  100  through the quick-release unit  60 . As shown in  FIG. 7 , the tightening ring  64  is pushed toward the automatic extrusion device  100  to move the steel balls  63  toward the outside of the through holes  611 , and then the protruding ring  74  of the clamping unit  70  is inserted in the quick-release seat  61  of the quick-release unit  60  with the notches  742  to engage with the positioning protrusions  613  to finish the limitation of the turning direction. Finally, the tightening ring  64  is released, so that the tightening ring  64  is pushed by the spring  62  to move toward the clamping unit  70 , as shown in  FIG. 8 , and stopped by C-shaped ring  65  to compress the steel balls  63 . The steel balls  63  are engaged in the positioning groove  741  of the clamping unit  70 , so that the clamping unit  70  is coupled with the quick-release unit  60 . 
       FIG. 8  and  FIG. 9  show the operation of the second transmission unit according to the first preferred embodiment of the present invention. When the pipe  200  is clamped on the clamping unit  70  and the clamping unit  70  is mounted on the automatic extrusion device  100  through the quick-release unit  60 , the automatic extrusion device  100  can be started to turn the action sleeve  43 . The outer threaded pipe  42  is turned in the inner threaded pipe  41  through the driving member  44  to move toward the coupling portion  512  of the center shaft  51 , and the center shaft  51  is pushed toward the clamping unit  70 . The mandrel assembly  53  is moved forward through the stop plate  76  to lean against the front end of the pipe  200  for extruding the front end of the pipe  200  to be in the form of a bell, as shown in  FIG. 9 . In this way, the user can extrude the pipe  200  quickly for a fast connection of pipes. As shown in  FIG. 9 , the engaging portion  421  of the outer threaded pipe  42  holds against the coupling portion  512  of the center shaft  51 , and the first inclined surface  424  and the second inclined surface  513  can reduce their contact area to lower the friction and abrasion. As shown in  FIG. 10 , when the extrusion unit  50  is pushed to the terminal and the outer threaded pipe  42  is stopped, the driving member  44  will be guided by the slip inclined surface  441  to disengage from the insertion trough  426  and to move toward the recess  434  causing a slip effect to prevent it from over extrusion. The center shaft  51  is connected to the action sleeve  43  through the fixing portion  511 . The center shaft  51  still drives the mandrel assembly  53  to turn for making the front end of the pipe  200  round while the driving member  44  is slipped. In addition, when the user finishes the extrusion procedure and wants to retreat the extrusion unit  50 , the action sleeve  43  will be turned in an opposite direction. Because the slip inclined surface  411  of the driving member  44  is located opposite to the turning direction, the driving member  44  is pushed by the elastic member  443  to insert into the insertion trough  426  again and the outer threaded pipe  42  is screwed to retreat from the inner threaded pipe  41 . The thrust assembly  45  located between the inner threaded pipe  41  and the stop portion  425  of the outer threaded pipe  42  can reduce the friction, so that the driving member  44  can screw the outer threaded pipe  42  with ease to retreat the extrusion unit  50  from the clamping unit  70 . 
       FIG. 11  is a partially enlarged view according to a second embodiment of the present invention, which is substantially similar to the first embodiment with the exceptions described hereinafter. The quick-release unit  60  has a quick-release seat  66  in the form of a board. The quick-release seat  66  has a circular hole  661  at a central portion thereof and a guide trough  67  at one side thereof. The guide trough  67  has two side walls  671 . Each of the side walls  671  has a through hole  672  thereon. The quick-release unit  60  further comprises a locking member  68  which is transversely located at one end of the guide trough  67 . The locking member  68  has two ends each formed with a curved portion  681  to be inserted through the through hole  672  and slightly exposed out of the through hole  672 . The clamping portion  75  of the clamping unit  70  is provided with a pair of slide blocks  77  corresponding to the guide trough  67 . Each of the slide blocks  77  has a positioning concave  771  corresponding to the through hole  672 . The clamping unit  70  is slid in the guide trough  67  with the curved portion  681  of the locking member  68  at one end of the guide trough  67  to engage with the positioning concave  771 , so that the clamping unit  70  is secured on quick-release unit  60  quickly, having the same effect of quick assembly as the first embodiment. 
     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.

Technology Category: 7