Winding device for strap fastener

Abstract

A strap fastener system includes a strap fastener for fastening a belt and a winding device for winding the strap. The winding device includes a housing, a reel, a control device and a torque spring. The reel is put in the housing for winding the strap. The control device is partially and movably installed in the housing between a rotational position and a non-rotational position. A torque spring is arranged between the reel and the control device for automatically rotating the reel in the non-rotational position of the control device.

1 . A strap fastener system comprising: 
 a strap fastener for fastening a belt; and    a winding device including a housing, a reel put in the housing for winding the strap, a control device partially and movably installed in the housing between a rotational position and a non-rotational position and a torque spring arranged between the reel and the control device for automatically rotating the reel in the non-rotational position of the control device.    
     
     
         2 . The strap fastener system of  claim 1  wherein the control device includes a shaft substantially extending in the housing, and the torque spring includes a first end attached to the reel and a second end attached to the shaft.  
     
     
         3 . The strap fastener system of  claim 2  wherein the shaft includes a square enlarged portion formed near a first end, and the housing includes a first wall defining a square aperture for receiving the square enlarged portion of the shaft in the non-rotational position.  
     
     
         4 . The strap fastener system of  claim 3  wherein the control device includes a knob attached to the square enlarged portion of the shaft.  
     
     
         5 . The strap fastener system of  claim 3  wherein the shaft further includes a circular enlarged portion formed near a second end, and the housing includes a second wall defining a circular aperture through which the circular enlarged portion of the shaft is inserted.  
     
     
         6 . The strap fastener system of  claim 5  wherein the control device further includes a compression spring compressed between the circular enlarged portion of the shaft and the second wall of the housing, thus biasing the control element into the non-rotational position.  
     
     
         7 . The strap fastener system of  claim 6  wherein the control device further includes a ring put around the shaft and against the circular enlarged portion of the shaft so that the compression spring is compressed between the ring and the second wall of the housing.  
     
     
         8 . The strap fastener system of  claim 2  wherein the shaft defines a slit for receiving the second end of the torque spring.  
     
     
         9 . The strap fastener system of  claim 1  wherein the torque spring is a coil spring.  
     
     
         10 . The strap fastener system of  claim 6  wherein the compression spring is a helical spring.