Automotive valve spring compressing tools

Claim 1

An automotive valve spring compressing tool comprising: a. a C-shaped frame consisting of upper and lower substantially horizontal portions connected by a substantially vertical side portion; b. a spring seat member mounted on the forward extremity of said lower portion; c. a tubular vertical guide sleeve fixedly mounted on the forward extremity of said upper horizontal portion in axial alignment with said spring seat; d. a threaded screw axially mounted in, and vertically slidable in, said guide sleeve and extending above and below the latter; e. a handle member pivotally mounted on the side portion of said frame so as to rotate in the plane of the latter; f. an internally threaded actuating nut threaded upon the above extending portion of said screw; g. an eccentrically positioned pivot element in said handle member; h. a tiltable lever medially pivoted on the upper horizontal portion of Said frame and pivotally mounted at its forward extremity on said actuating nut; i. a toggle link pivotally extending between the rear extremity of said tiltable lever and said eccentrically positioned pivot element for transmitting the eccentric movements of said eccentrically positioned pivot element to the rear extremity of said tiltable lever to cause the forward extremity of the latter to axially move said screw upon rotation of said handle member; j. an upper link rivet pivotally securing the upper extremity of said toggle link to the rear extremity of said tiltable lever, the lower extremity of said toggle link being pivotally secured to said eccentrically positioned pivot element; k. a handle pivot pivotally securing said handle member to said frame; l. a stop member limiting the degree of downward rotation of said handle member; and m. the axes of said upper link rivet, said eccentrically positioned pivot element and said handle pivot being relatively positioned so that as said handle member is brought into engagement with stop member, said eccentrically positioned pivot element will travel past an imaginary dead center line extending between the axes of said upper link rivet and said handle pivot to assist return movement of said eccentrically positioned pivot element.