Belt adjuster box style
BACKGROUND OF THE INVENTION 
     The herein invention is an improvement on the co-pending application of John A. Gaylord, Ser. No. 695,077 filed June 11, 1976, now U.S. Pat. No. 4,051,743. 
     The primary object of the invention is to provide a device of simple structure which can be easily manufactured and into which a belt can be quickly threaded and thereafter the belt can be adjusted with the minimum effort for clamping the belt in adjusted position or releasing the risers to permit adjustment, and wherein inadvertent release of the cam by body movement is obviated. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a cross-sectional view of the device showing the webbing released. 
     FIG. 2 is a plan view of the device. 
     FIG. 3 is an end view of FIG. 2. 
     FIG. 4 is a cross-sectional view showing the webbing clamped. 
     FIG. 5 is a fragmental detail view illustrating the connection of the manipulating yoke to the cam. 
     FIG. 6 is a fragmental view on a larger scale showing the self adjusting feature. 
    
    
     DETAILED DESCRIPTION 
     The adjuster has an elongated body 1 with a top 2, bottom 3 and side walls 4 which form an elongated passage 6. A pair of parallel connecting ears 7 extend from the ends 4 in line therewith. A transverse connecting rib 8 connects the free ends of the ears 7, the inner edge 11 of which is rounded so that a webbing 11 can be placed around it. 
     An elongated cam 12 is located longitudinally in the passage 4, on a shaft 13 which is supported loosely in holes in the opposite ends 4 of the box body 1. The distance between the risers 14 of the cam 12 is such that when the cam 12 is turned in a contra-clockwise direction, viewing FIG. 1, the risers 14 approach respectively the top and bottom of the passage 6. The risers 14 of the cam 12, in this illustrative form, are provided with ridges 16 formed by parallel grooves 17. 
     A belt 18 is played around the cam 12. When the branch 19 of the belt 18 is subjected to a pull the force so exerted turns the cam 12 so that the risers 14 approach top and bottom of the passage 6 and clamp the belt 18 and the branch 19 against said top and bottom, thereby clamping the belt webbing 18 in adjusted position as long as the lower branch 19 is under tension. 
     A manipulating yoke 21 has its legs journalled on the shaft 13 between the respective ends of the cam 12 and the adjacent ends 4 of the passage 6. The hub 22 on each leg of the yoke 21 has a hole 23 therein spaced from the shaft 13 to accomodate a pin 24 which enters the respective adjacent end of the cam 12, thereby to rock the cam 12 whenever the yoke 21 is rocked. 
     A cap 25 covers the inner end of the passage 4 and forms a chamber to accomodate the yoke 21. On the handle bar 26 of the yoke 21 is a manipulating member in the present form a strap 27, which extends through a slot 28 through the top of the cap 25. This cap 25 closes the passage 4 beyond the yoke 21 between the ears 7. By pulling the strap 27 the cam 12 is turned in clockwise direction viewing FIG. 1 thereby moves the cam risers 14 away from the respective top and bottom of the passage 4 and thereby relieves the belt for adjustment. The cap 25 is sufficiently resilient to be adapted to be snapped in place. Flanges 28 along the open edges of the cap 25 snap into grooves 29 in the outside of the top 2 and bottom 3 parallel with the cam 12. 
     The axial hole 31 in the cam 12 and the corresponding hole 32 in the legs 22 of the yoke 21 are elongated or oval so that the cam 12 is capable of aligning itself to the natural force balance center when the gripping surfaces of its risers squeeze into the webbing. This enables the cam to adjust to fabrics of different thicknesses, and obviates the need for exact centering of the cam within the adjuster body.