Board for a board-type hammer

Claim 1

A BOARD, OF WHICH OPPOSITE PARALLEL FACES ARE ADAPTED TO BE GRIPPED BETWEEN CONTRA-ROTATING DRIVEN ROLLERS OF A BOARD-TYPE HAMMER MACHINE FOR RAISING A TUP SECURED TO THE FOOT OF THE BOARD TO A POINT AT WHICH THE ROLLER WILL RELEASE THE BOARD FOR ENABLING THE TUP TO DELIVER A BLOW BY GRAVITY, COMPRISING A WOODEN BODY, SAID BODY FORMED WITH AXIALLY-SPACED RECESSES OF UNIFORM DEPTH ALONG EACH OF TWO OPPOSITE SIDES THEREOF, SAID RECESSES HVING THEIR ADJACENT SIDES PARALLEL TO EACH OTHER BUT EXTENDING OBLIQUELY ACROSS SAID BODY, A PLURALITY OF SEPARATE SHEETS OF A TOUGH MATERIAL HAVING A LOW FLOW RATE AND A HIGH COEFFICIENT OF FRICTION, SAID SHEETS OF THE SAME DIMENSIONS AS SAID RECESSES, AND MEANS SECURING ONE OF SAID SHEETS IN EACH SAID RECESS TO PROVIDE SURFACES TO BE GRIPPED BY THE ROLLERS.