Swivel assembly rotatable through more than one revolution

Claim 1

A SWIVEL ASSEMBLY COMPRISING: A HOUSING HAVING A CENTRAL AXIS AND AN OPENING IN ONE END ON SAID AXIS AND SURROUNDED BY A GENERALLY SPHERICALLY CURVED END WALL OF THE HOUSING, A CUP MEMBER LONGITUDINALLY DISPOSED WITHIN SAID HOUSING FOR AXIAL MOVEMENT ALONG AND ROTATION ABOUT SAID AXIS, RESILIENT MEANS ACTING BETWEEN SAID HOUSING AND SAID CUP MEMBER FOR YIEDABLY URGING THE LATTER MEMBER AXIALLY TOWARD SAID OPENING, SAID CUP MEMBER HAVING A GENERALLY SPHERICALLY CURVED RECESS PRESENTED TOWARD SAID OPENING AND DEFINING WITH SAID END WALL A GENERALLY SPHERICAL SOCKET, A GENERALLY SPHERICAL SWIVEL MEMBER ROTATABLY AND SWIVELLY DISPOSED IN SAID SOCKET AND INCLUDING AN EXTENSION PROTRUDING THROUGH SAID OPENING, THE PORTION OF SAID EXTENSION WITHIN SAID OPENING BEING SUBSTANTIALLY SMALLER IN TRANSVERSE CROSS-SECTION THAN THE OPENING TO PERMIT LIMITED SWIVEL MOVEMENT OF SAID SWIVEL MEMBER IN SAID SOCKET, FIRST CO-ACTING STOP MEANS ON SAID HOUSING AND CUP MEMBER INCLUDING AN INTERNAL PROJECTING STOP SHOULDER ON SAID HOUSING AND AN EXTERNAL PROJECTING STOP SHOULDER ON SAID CUP MEMBER ENGAGEABLE WITH SAID HOUSING STOP SHOULDER FOR LIMITING RELATIVE ROTATION OF SAID CUP MEMBER RELATIVE TO SAID HOUSING IN SUCH MANNER THAT SAID CUP MEMBER IS ROTATABLE RELATIVE TO SAID HOUSING THROUGH A GIVEN ANGLE APPROACHING 360*, AND SECOND CO-ACTING STOP MEANS ON SAID CUP MEMBER AND SWIVEL MEMBER INCLUDING A PAIR OF DIAMETRICALLY OPPOSED, AXIALLY EXTENDING GROOVES IN THE EXTERNAL SPHERICALLY CURVED SURFACE OF SAID SWIVEL MEMBER AND A PAIR OF DIAMETRICALLY OPPOSED, AXIALLY EXTENDING TONGUES ON SAID CUP MEMBER ENGAGING IN AND SUBSTANTIALLY NARROWER THAN SAID GROOVES, RESPECTIVELY, FOR LIMITING RELATIVE ROTATION OF SAID SWIVEL MEMBER RELATIVE TO SAID CUP MEMBER IN SUCH MANNER THAT SAID SWIVEL MEMBER IS ROTATABLE RELATIVE TO SAID CUP MEMBER THROUGH AN ANGLE AT LEAST EQUAL TO THE DIFFERENCE BETWEEN SAID GIVEN ANGLE AND 360*, WHEREBY SAID SWIVEL MEMBER IS ROTATABLE THROUGH A FULL 360* RELATIVE TO SAID HOUSING.