Automatic winding device for strap fastener

Abstract

An automatic winding device is provided for a strap fastener. The automatic winding device includes a housing, a reel rotationally received in the housing for winding a strap introduced through the strap fastener and a spring connected between the housing and the reel. A shaft is securely received in the housing for supporting the reel. The spring is a coil spring mounted on the shaft and received in the reel. The spring includes an internal end secured to the shaft and an external end secured to the reel. In an aspect, at least one ratchet wheel is formed on the reel, and a detent is movably mounted on the housing for releasable engagement with the reel. The detent is biased by means of a second spring. The housing defines a slot through which the detent is inserted. The housing includes a stem formed thereon within the slot. The detent includes a groove defined therein for receiving the stem and the second spring. Thus, the second spring is compressed between the stem and a portion of the detent.

1 . An automatic winding device for a strap fastener, the automatic winding device including a housing, a reel rotationally received in the housing for winding a strap introduced through the strap fastener and a spring connected between the housing and the reel.  
     
     
         2 . The automatic winding device according to  claim 1  including a shaft securely received in the housing for supporting the reel.  
     
     
         3 . The automatic winding device according to  claim 2  wherein the spring includes a first end secured to the shaft and a second end secured to the reel.  
     
     
         4 . The automatic winding device according to  claim 3  wherein the shaft defines at least one slit for receiving the first end of the spring.  
     
     
         5 . The automatic winding device according to  claim 3  wherein the reel defines a recess for receiving the second end of the spring.  
     
     
         6 . The automatic winding device according to  claim 2  wherein the spring is a coil spring mounted on the shaft and received in the reel.  
     
     
         7 . The automatic winding device according to  claim 6  wherein the spring includes an internal end secured to the shaft and an external end secured to the reel.  
     
     
         8 . The automatic winding device according to  claim 7  wherein the shaft defines at least one slit for receiving the internal end of the spring.  
     
     
         9 . The automatic winding device according to  claim 7  wherein the reel defines a recess in an internal face for receiving the external end of the spring.  
     
     
         10 . An automatic winding device for a strap fastener, the automatic winding device including a housing, a reel rotationally received in the housing for winding a strap introduced through the strap fastener, a spring connected between the housing and the reel, at least one ratchet wheel formed on the reel and a detent movably mounted on the housing for releasable engagement with the reel.  
     
     
         11 . The automatic winding device according to  claim 10  wherein the housing defines a slot through the detent is inserted.  
     
     
         12 . The automatic winding device according to  claim 11  including a second spring for biasing the detent into engagement with the at least one ratchet wheel.  
     
     
         13 . The automatic winding device according to  claim 12  wherein the housing includes a stem formed thereon within the slot, and the detent includes a groove defined therein for receiving the stem and the second spring so that the second spring is compressed between the stem and a portion of the detent.  
     
     
         14 . The automatic winding device according to  claim 10  wherein the housing defines a first slot through which the strap is inserted.