Method of manufacture of a nut and tail assembly

Abstract

A nut and tail assembly and method of manufacture including a nut having a first end and an inward flange at the other end, a longitudinal cylindrical hollow body having a first end and a second end at which is located an outstanding flange and a circular longitudinal sleeve. The sleeve extends along said sliding surface and has a flange at a first end abutting against the body flange. A stop is located between the ends of the body and defines a cavity sliding surface generally parallel to the longitudinal body between the stop and flange. The nut inward flange extends into the body cavity and is of large enough diameter to be able to slide on said body sliding surface, but small enough to be held within said cavity defined between said stop and sleeve flange. Projections on the sleeve flange assist in locating the sleeve relative to the nut during the moulding process.

1 . A method of manufacture of a fitting with an inner member having a sleeve and an outer member that is rotatable over said sleeve, the method including the steps of: 
 a) making the outer member to a shape that includes a radially inturned annular flange at one end and an axially extending portion having an internal thread,    b) placing a sleeve within said outer member, said sleeve having a radial outwardly extending annular flange, said sleeve flange abutting against said outer member flange and extending longitudinally away from said internal thread,    c) positioning the outer member and sleeve onto an axially aligned male portion of the moulding die and within two female portions; said male portions including a plurality of locating pins engaging said sleeve;    d) closing the moulding die thereby placing the outer member and sleeve in their final position and establishing a moulding cavity within which is located the outer member and sleeve, part of the surface of said cavity defined by the outer surface of the sleeve annular flange, part of which is defined by the sleeve inner surface, part of which is defined by inner surfaces of the female die portions, and part of which is defined by surfaces of the male die portions.    
   
   
       2 . The method of manufacture of a fitting as defined in  claim 1 , further comprising the steps of: 
 e) injecting a fluent plastics material in the moulding cavity; and    f) cooling the plastics material.    
   
   
       3 . A method of manufacture of a fitting as in  claim 1 , wherein making the outer member includes at least one of moulding and machining operations.  
   
   
       4 . A method of manufacture of a fitting as in  claim 1 , wherein the moulding cavity is so shaped that the length of the inner member not adjacent said sleeve flange is longer to allow for shrinkage of the inner member during cooling.  
   
   
       5 . A method of manufacture of a fitting with an inner member having a sleeve and an outer member that is rotatable over said sleeve, the method including the steps of: 
 a) making the outer member to a shape that includes a radially inturned annular flange at one end and an axially extending portion having an internal thread,    b) placing a sleeve within said outer member, said sleeve having a radial outwardly extending annular flange, and having one or more locating projections extending outwardly away from said annular flange in a direction parallel to a longitudinal axis of the sleeve;    c) abutting the one or more projections on the flange of the sleeve against said outer member flange; such that said sleeve extends longitudinally away from said internal thread;    d) positioning the outer member and sleeve onto an axially aligned male portion of a moulding die and within two female portions thereof;    e) maintaining the relative positions of the outer member and the sleeve by way of the one or more locating projections;    f) closing the moulding die thereby placing the outer member and sleeve in their final position and establishing a moulding cavity within which is located the outer member and sleeve, part of the surface of said cavity defined by the outer surface of the sleeve annular flange, part of which is defined by the sleeve inner surface, part of which is defined by inner surfaces of the female die portions, and part of which is defined by surfaces of the male die portions.    
   
   
       6 . The method of manufacturing as defined in  claim 5 , further comprising the step of: 
 g) injecting fluent plastics material into the moulding cavity; and    h) cooling the injected plastics material.    
   
   
       7 . A method of manufacture of a fitting as in  claim 5 , wherein making the outer member includes at least one of moulding and machining operations.  
   
   
       8 . The method of manufacture of a fitting as in  claim 7 , wherein the step of placing a sleeve within said outer member includes the step of selecting a sleeve manufactured from a metal.  
   
   
       9 . A method of manufacture of a fitting as in  claim 5 , wherein the moulding cavity is so shaped that the length of the inner member not adjacent said sleeve flange is longer to allow for shrinkage of the inner member during cooling.  
   
   
       10 . The method of manufacturing as defined in  claim 5 , wherein the step of placing the sleeve on the outer member includes utilizing a sleeve which includes a plurality of annular grooves formed at an end opposite to the radial outwardly extending annular flange.  
   
   
       11 . The method of manufacturing as defined in  claim 6 , whereby the step of injecting fluent plastics material into the moulding cavity causes the annular grooves to be filled with plastic, thereby embedding at least a portion of the sleeve into the moulded fitting.  
   
   
       12 . A die for moulding of the tail of a nut and tail assembly having a sleeve, said die including two separable complementary female die portions having inner surfaces defining a recess, and at least one male die portion characterized in that the die moulding cavity is defined partly by the outer surface of the annular flange of said sleeve when inserted into said recess, partly by the recess surfaces of the female die members, partly by the inner surface of said sleeve, and partly by a surface of the male die portion.  
   
   
       13 . The die as defined in  claim 12 , wherein the male die portion includes one or more projections for spacing components retained within the die.  
   
   
       14 . The die as defined in  claim 13 , wherein the one or more projections are locating pins.  
   
   
       15 . The die as defined in  claim 14 , wherein the male die portion includes four locating pins.  
   
   
       16 . The die as defined in  claim 12 , wherein the annular flange of the sleeve includes one or more projections for spacing components retained within the die.  
   
   
       17 . The die as defined in  claim 16 , wherein the one or more projections are locating pins.  
   
   
       18 . The die as defined in  claim 17 , wherein the annular flange includes four locating pins.