Abstract:
An emergency escape pulley structure includes a main shaft on which a plurality of rope wheels are mounted. The main shaft actuates a deceleration gear set, so as to link a braking wheel. The rope wheels are controlled by a control member to turn independently on the shaft, thereby enabling two or more persons to use the emergency escape pulley structure at the same time.

Description:
RELATED U.S. APPLICATIONS 
     Not applicable. 
     STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT 
     Not applicable. 
     REFERENCE TO MICROFICHE APPENDIX 
     Not applicable. 
     FIELD OF THE INVENTION 
     The present invention relates generally to an emergency escape device, and more particularly to an emergency escape pulley structure capable of allowing two or more persons to escape at the same time. 
     BACKGROUND OF THE INVENTION 
     The conventional emergency escape pulley comprises a spindle and a rope wheel to facilitate the escape of only one person at a time. As a result, the conventional emergency escape pulley is of a little help in a situation in which one or more persons must be evacuated on an emergency basis. It is conceivable that any delay in escape in the emergency situation can often result in a human tragedy. 
     BRIEF SUMMARY OF THE INVENTION 
     The primary objective of the present invention is to provide an emergency escape pulley structure capable of evacuating a plurality of persons from an emergency site. 
     The emergency escape pulley structure of the present invention comprises a main shaft on which a plurality of rope wheels are mounted. The main shaft actuates a deceleration gear set so as to link a braking wheel. The rope wheels are controlled by a control member to turn independently on the main shaft, thereby enabling two or more persons to use the emergency escape pulley structure at the same time. 
    
    
     The features and the advantages of the present invention will be more readily understood upon a thoughtful deliberation of the following detailed description of the present invention with reference to the accompanying drawings. 
     BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS 
     FIG. 1 shows a sectional schematic view of the present invention. 
     FIG. 2 shows an exploded schematic view of the present invention. 
     FIG. 3 shows a schematic plan view of the deceleration gear set of the present invention. 
     FIG. 4 shows a schematic plan view of the braking wheel of the present invention. 
     FIG. 5 shows a sectional schematic view of the main shaft and the rope wheel of the present invention. 
     FIG. 6 shows a sectional schematic view of the main shaft and a plurality of rope wheels which are exerted on by an external force. 
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     As shown in all drawings provided herewith, an emergency escape pulley structure embodied in the present invention is formed of a fastening board  20 , a housing  30 , a braking wheel  40 , a deceleration gear set, a plurality of rope wheels  60  and  61 , and a main shaft  70 . 
     The fastening board  20  is provided with a plurality of shaft holes  21 . 
     The housing  30  is provided with a lower receiving compartment  31  and an upper receiving compartment  32 . The lower receiving compartment  31  is provided in a top wall  33  with a plurality of longitudinally-oriented through holes  34  for receiving a plurality of deceleration rods  35  which are provided at the top end with a spring  36  fitted thereover. The housing  30  is fastened to one side of the fastening board  20 . 
     The braking wheel  40  is located in the upper receiving compartment  32  of the housing  30  by means of a shaft rod  41 , with one end of the shaft rod  41  extending out of another side of fastening board  20 . 
     The deceleration gear set is formed of a first gear  51 , a second gear  52 , a third gear  54 , and a fourth gear  55 . The first gear  51  is mounted in the lower receiving compartment  31  of the housing  30  and is engaged with the second gear  52 . The second gear  52  is mounted on a shaft rod  53  with one end thereof extending out of another side of the fastening board  20  to mount thereon the third gear  54  which is engaged with the fourth gear  55 . The fourth gear  55  is mounted on an outer end of the shaft rod  41  on which the braking wheel  40  is mounted. 
     The rope wheels  60  and  61  are arranged in the lower receiving compartment  31  of the housing  30  in a parallel manner. The rope wheels  60  and  61  are provided with a rope  62  which is wound thereon. The rope wheels  60  and  61  are provided in the center thereof with a through hole  63  which is in turn provided in the inner wall with a horizontal long slot  64 . 
     The main shaft  70  is horizontally disposed and is provided in the outer wall surface thereof with a plurality of transverse slot holes  71  for disposing a control member  80 . A spring  81  is disposed in the transverse slot hole  71  such that one end of the spring  81  is fitted over a retaining bolt  82  which is provided with an inclined plane  83 . The rope wheels  60  and  61  are mounted on the main shaft  70  such that the top end of the retaining bolt  82  is inserted into the horizontal long slot  64  of the through hole  63  of the rope wheels  60 ,  61 . The main shaft  70  is fastened pivotally at one end with a side wall  37  of the housing  30  such that other end of the main shaft  70  is pivotally fastened with the fastening board  20  via the first gear  51 . The bottom end of the deceleration rod  35  comes in contact with the rope wheels  60 ,  61 . 
     As one of the rope wheels is pulled by the rope  62  to turn, the horizontal long slot  64  pushes the retaining bolt  82  of the control member  80  to link the main shaft  70 . In the meantime, rope wheel  61  is not pulled by the rope  62 . When the main shaft  70  turns, the rope wheel  61  is caused by the inclined plane  83  to remain stationary. The main shaft  70  is caused by rope wheel  60  to turn. As a result, when one rope wheel  60  is being used by a person to escape, another rope wheel  61  is not actuated by the rope wheel  60  in motion. In other words, two persons can escape simultaneously by using the two rope wheels  60 ,  61 . The rope wheels of the present invention may be three, four, or more, depending on the need. As some of the rope wheels in use, the remaining rope wheels are kept stationary by the control members  80 . 
     The present invention described above is to be regarded in all respects as being merely illustrative and nonrestrictive. Accordingly, the present invention may be embodied in other specific forms without deviating from the spirit thereof. The present invention is therefore to be limited only by the scope of the following claim.