One directional movement catch device

Claim 1

A CATCH DEVICE FOR CHECKING RELATIVE MOVEMENT OF TELESCOPING INNER AND OUTER TUBE IN ONE DIECTION, THE INNER TUBE HAVING A CATCH BLOCK MOUNTED IN AN APERTURE THEREIN AND ADAPTED TO OPERATIVELY ENGAGE AN APERTURE IN THE OUTER TUBE, THE CENTRAL PORTION OF SAID BLOCK BEING GENERALLY WEDGE-SHAPED IN FORM AND THE UPPER TAPERED SURFACE THEREOF BEING LESS IN LENGTH THAN THE APERTURE IN SAID INNER TUBE, SAID BLOCK HAVING PROJECTING ENDS DISPOSED WITHIN SAID INNER TUBE AND ENGAGINE THE WALL OF THE INNER TUBE IN LIMITING OUTWARD RADIAL MOVEMENT OF THE BLOCK WITH RESPECT TO SAID INNER TUBE, ONE END BEING STRAIGHT AND THE OTHER OF SAID ENDS HAVING A TAPERED UPPER SURFACE, THE CENTRAL PORTION OF THE BLOCK HAVING A TAPERED UPPER SURFACE PARALLEL TO THE FIRST NAMED TAPERED FACE, SAID TAPERED SURFACES BEING SPACED AND JOINED BY A SHOULDER PORTION OF A HEIGHT CORRESPONDING TO THE THICKNESS OF THE WALL OF THE INNER TUBE, SAID CENTRAL PORTION OF THE BLOCK HAVING A PERPENDICULAR STOP WALL AT THE SIDE THEREOF OPPOSED TO SAID SHOULDER PORTION SAID TOP WALL OPERATIVELY ENGAGING THE APERTURE IN THE OUTER TUBE IN DEFINITELY CHECKING MOVEMENT OF THE INNER TUBE IN ONE DIRECTION IN SAID OUTER TUBE, A FLAT AND BOWED SPRING MOUNTED IN THE INNER TUBE AND HAVING AN ANGULARLY OFFSET END FREELY AND MOVABLY ENGAGING THE BLOCK TO PROVIDE ROCKING MOVEMENT OF THE BLOCK ON SAID OFFSET END, SAID SPRING NORMALLY URGING THE CATCH DEVICE OUTWARDLY INTO OPERATIVE POSITION, SAID OFFSET AND OPERATING IN A CHANNEL ON THE INNER SURFACE OF THE CENTRAL PORTION OF SAID BLOCK IN PROVIDING SAID FREE AND MOVABLE ENGAGEMENT, SAID FIRST NAMED TAPERED UPPER SURFACE PERMITTING ROCKING MOVEMENT OF THE CATCH DEVICE IN SAID INNER TUBE, THE LENGTH OF THE OFFSET END OF THE SPRING BEING GREATER THAN THAT PART OF THE STOP WALL WHICH PROJECTS BEYOND THE APERTURE OF THE INNER TUBE WHEN THE CATCH DEVICE IS IN OPERATIVE POSITION, AND THE BOWED SPRING, ADJACENT SAID OFFSET END, ENGAGING SAID FIRST NAMED STRAIGHT END OF THE BLOCK IN AIDING TENSIONAL SUPPORT OF THE CATCH DEVICE IN OPERATIVE POSITION.