Tapered tie bolt

Claim 1

A REUSABLE ASSEMBLY FOR ASSISTANCE IN MAINTAINING CONCRETE FORM BOARDS IN PRESELECTED SPACED POSITIONS COMPRISING: A SHAFT HAVING A CROSS SECTION WHICH GRADUALLY DIMINISHES FROM A WIDER END TO A NARROWER END THEREOF; A FIRST FRUSTO-CONICAL SHOULDER MEMBER, OF RIGID MATERIAL AND SUBSTANTIALLY SHORTER LENGTH THAN SAID SHAFT, INTEGRALLY JOINED TO THE WIDER END OF SAID SHAFT AND WHOSE TAPER IS GREATER BUT IN THE SAME DIRECTION AS THE TAPER OF SAID SHAFT, A CYLINDRICAL PORTION EXTENDING LONGITUDINALLY OUTWARDLY THEREFROM, SAID FIRST SHOULDER MEMBER FOR ENGAGING AND PREVENTING MOVEMENT OF A FIRST FORM BOARD IN AT LEAST ONE DIRECTION; A SECOND FRUSTO-CONICAL SHOULDER MEMBER, OF RIGID MATERIAL AND SUBSTANTIALLY SHORTER LENGTH THAN SAID SHAFT, THREADABLY ENGAGEABLE WITH THE NARROWER END OF SAID SAID SHAFT AND WHOSE TAPER IS GREATER AND IN THE OPPOSITE DIRECTION AS THE TAPER OF SAID SHAFT, A CYLINDRICAL PORTION EXTENDING LONGITUDINALLY OUTWARDLY THEREFROM, SAID SECOND SHOULDER MEMBER FOR ENGAGING A SECOND FORM BOARD ALIGNED WITH SAID FIRST FORM BOARD AND FOR MAINTAINING THE SECOND FORM BOARD AT A PRESELECTED RELATIVE DISTANCE FROM SAID FIRST FORM BOARD; SAID ASSEMBLY BEING ENTIRELY WITHDRAWABLE FROM SAID FIRST AND SECOND FORM BOARDS AND FORM CONCRETE WHICH MAY BE FORMED THEREBETWEEN WHEN SAID SECOND MEANS IS REMOVED FROM SAID SHAFT.