Telescopic draw bars

Claim 1

AN ADJUSTABLE DRAW BAR COMPRISING A FIRST DRAW BAR MEMBER AND A SECOND DRAW BAR MEMBER, SAID DRAW BAR MEMBERS BEING IN TELESCOPING RELATIONSHIP AND SAID SECOND DRAW BAR MEMBER TELESCOPING WITHIN SAID FIRST DRAW BAR MEMBER, AN ADJUSTABLE ABUTMENT MEMBER SUPPORTED ON SAID FIRST DRAW BAR MEMBER INCLUDING A PIN CONNECTION BETWEEN SAID ABUTMENT MEMBER AND SAID FIRST DRAW BAR MEMBER, A PLURALITY OF SPACED APERTURES IN SAID FIRST DRAW BAR MEMBER ADAPTED TO RECEIVE SAID PIN CONNECTION TO ADJUST THE POSITION OF SAID ABUTMENT MEMBER, A PLURALITY OF OPENINGS IN SAID DRAW BAR MEMBER DISPOSED IN A PLANE NORMAL TO THE PLANE OF SAID SPACED APERTURES, A PIN CARRIED BY SAID ABUTMENT INCLUDING A SPRING ACTING BETWEEN SAID ABUTMENT AND SAID FIRST DRAW BAR MEMBER FOR ROCKING THE ABUTMENT TO A POSITION WHERE SAID PIN EXTENDS WITHIN SAID FIRST DRAW BAR MEMBER, A PAIR OF SPACED COLLARS ON THE INNER END OF SAID SECOND DRAW BAR MEMBER ADAPTED TO BE HELD BETWEEN SAID PIN CONNECTION AND SAID ABUTMENT SUPPORTED PIN, AND MEANS ENABLING SAID COLLARS TO MOVE PAST SAID ABUTMENT SUPPORTED PIN COMPRISING AN AXIAL SLOT IN SAID ENDMOST COLLAR AND AN AXIAL SLOT IN THE OTHER OF SAID COLLARS AND SPACED 90* FROM THE SLOT OF SAID OTHER COLLAR.