Abstract Means for removably securing an insert element to a larger base piece. The invention as disclosed solves the problem of securing an insert element, such as a punch, to a larger base piece such as a punch ring. In lieu of the usual set screw method of securing the punches to the punch ring, quick releasable means is provided for fixedly but removably securing the shank of a punch or the like within a bore in the punch ring. The cross sectional contour of the bore is formed so that the shank engages the bore at two points in cross section. The shank is forced against said two points by means of a pair of spring pressed elements, one of said elements also contributing to urging the shank against the bottom of the bore. The use of two spring pressed elements greatly contributes to the stability of shank in the bore and which stability could not be obtained by use of one spring pressed element regardless of the amount of force exerted by such element.
In the combination that includes a base piece and an element secured thereto: said base piece being formed with a bore opening outwardly of one face thereof, said element including a shank adapted to be received in said bore through the open end thereof, a first spring pressed element on one side of said bore urging said shank transversely of said bore toward the opposite side thereof, said shank and bore being formed in cross section to provide two spaced points of engagement between said shank and said bore at said opposite side, the cross sectional contour of said shank being smaller than the cross sectional contour of said bore to provide clearance therebetween whereby the periphery of said shank is engaged only by said force means and said bore at said two points to provide stability of said element relative to said base piece. said bore being provided with a bottom rigid with said base piece and said shank being provided with a camming surface acted upon by said first spring pressed element to urge said shank against said bottom at the same time it is urged toward said opposite side. a second spring pressed element axially spaced from said first spring pressed element for urging said shank against said opposite side.
Claim 2
Dependent Claim
213 words
In the combination that includes a base piece and an element secured thereto: said base piece being formed with a bore opening outwardly of one face thereof, said element including a shank adapted to be received in said bore through the open end thereof, a first spring pressed element on one side of said bore urging said shank transversely of said bore toward the opposite side thereof, said shank and bore being formed in cross section to provide two spaced points of engagement between said shank and said bore at said opposite side, the cross sectional contour of said shank being smaller than the cross sectional contour of said bore to provide clearance therebetween whereby the periphery of said shank is engaged only by said force means and said bore at said two points to provide stability of said element relative to said base piece. said bore being provided with a bottom rigid with said base piece and said shank being provided with a camming surface acted upon by said first spring pressed element to urge said shank against said bottom at the same time it is urged toward said opposite side. a second spring pressed element axially spaced from said first spring pressed element for urging said shank against said opposite side.
Claim 3
Dependent Claim
23 words
The combination of claim 1 wherein said second element is interposed between said first element and the outer open end of said bore.
Claim 4
Dependent Claim
21 words
The combination of claim 1 wherein a stop is provided for limiting the radially inward movement of one of said elements.