Holding structure of hose clamp

Abstract

A hose clamp is mounted on a fit-on portion of a hose such that a clamp band in expanded state enters in an annular clamp mounting portion and an anti-rotation engaging portion is located in a engaging holder portion. The clamp band is diametrically contracted and is tightened to the clamp mounting portion so as not to lower sealing property between the hose and a pipe.

1 . A holding structure of a hose clamp wherein the hose clamp has an annular clamp body to be fitted on a clamp mounting portion of an end portion of a hose, the holding structure, comprising: 
 an anti-rotation engaging portion formed on the clamp body,    an engaging holder portion provided on the hose so as to engage with the anti-rotation engaging portion in a circumferential direction when the clamp body is fitted on the clamp mounting portion, and    wherein the engaging holder portion is provided on an end edge portion of the hose.    
   
   
       2 . The holding structure of the hose clamp as set forth in  claim 1 , wherein the anti-rotation engaging portion protrudes from the clamp body in a direction toward an end edge of the hose.  
   
   
       3 . The holding structure of the hose clamp as set forth in  claim 1 , wherein a sealing member or a sealing portion is provided in an inner periphery of the end portion of the hose, the sealing member or the sealing portion is disposed on a longitudinally inner end with respect to the clamp mounting portion.  
   
   
       4 . The holding structure of the hose clamp as set forth in  claim 1 , wherein the engaging holder portion is in a form of a recess or a cutout in the end edge portion of the hose.  
   
   
       5 . The holding structure of the hose clamp as set forth in  claim 4 , wherein a beam bridges in the recess or the cutout for preventing the recess or the cutout from being widened.  
   
   
       6 . The holding structure of the hose clamp as set forth in  claim 5 , wherein the beam is provided in a longitudinally inner end of the recess or the cutout, and the anti-rotation engaging portion engages with a longitudinally outer end of the recess or the cutout when the clamp body is fitted on the clamp mounting portion.  
   
   
       7 . The holding structure of the hose clamp as set forth in  claim 5 , wherein the anti-rotation engaging portion is designed so as not to contact the beam when the clamp body is diametrically contracted to tighten the clamp mounting portion.  
   
   
       8 . The holding structure of the hose clamp as set forth in  claim 1 , wherein a protruding portion protruding in a longitudinal direction is formed on an end edge of the hose, and the engaging holder portion is formed in the protruding portion.  
   
   
       9 . A holding structure of a hose clamp wherein the hose clamp has an annular clamp body to be fitted on a clamp mounting portion of an end portion of a hose, the holding structure, comprising: 
 an anti-rotation engaging portion formed on the clamp body,    an engaging holder portion provided on the hose so as to engage with the anti-rotation engaging portion in a circumferential direction when the clamp body is fitted on the clamp mounting portion,    wherein the clamp body has one circumferential end portion and the other circumferential end portion, and is provided with an operation screw on the other circumferential end portion for diametrically contracting and expanding the clamp body by engaging with the one circumferential end portion or one circumferential end area, the operation screw is arranged so as to extend in a tangential direction or generally in the tangential direction of the clamp body,    wherein the engaging holder portion includes a pair of side portions in circumferentially spaced, face-to-face relation to each other, and is formed so as to position the anti-rotation engaging portion in the circumferential direction while receiving the anti-rotation engaging portion movably in the circumferential direction between the pair of the side portions, and    wherein a circumferential distance between the pair of the side portions is set so as to locate the anti-rotation engaging portion midway between the pair of the side portions when the clamp body is diametrically contracted to tighten the clamp mounting portion by rotating the operation screw.    
   
   
       10 . The holding structure of the hose clamp as set forth in  claim 9 , wherein the operation screw has a head and a leading end portion and is arranged with the head being located on a circumferential center side of the clamp body with respect to the leading end portion, and the anti-rotation engaging portion is formed on one circumferential side portion of the clamp body.  
   
   
       11 . The holding structure of the hose clamp as set forth in  claim 9 , wherein the anti-rotation engaging portion protrudes from the clamp body in an opposite direction of an end edge of the hose.  
   
   
       12 . The holding structure of the hose clamp as set forth in  claim 9 , wherein the clamp body is in a form of a clamp band, and the clamp band is diametrically contracted or expanded by adjusting an overlapped length or a crossover length of circumferentially opposite end portions or of the one circumferential end area and the other circumferential end area thereof.  
   
   
       13 . The holding structure of the hose clamp as set forth in  claim 12 , wherein the clamp band is provided on the other circumferential side portion or the other circumferential end area with a stopper or a marking for preventing the clamp band from being diametrically overcontracted, and the clamp band is to be diametrically contracted to tighten the clamp mounting portion by rotating the operation screw until one circumferential edge of the clamp band abuts the stopper or reaches a position of the marking.  
   
   
       14 . The holding structure of the hose clamp as set forth in  claim 13 , wherein a circumferential distance between the pair of the side portions is set so as to locate the anti-rotation engaging portion midway between the pair of side portions when the one circumferential edge of the clamp band abuts the stopper or reaches the position of the marking.