Fire escape – ladder – or scaffold – Self-sustaining – Scaffold horse
Patent
1994-09-14
1996-01-30
Chin-Shue, Alvin C.
Fire escape, ladder, or scaffold
Self-sustaining
Scaffold horse
269289MR, F16M 1100
Patent
active
054874459
ABSTRACT:
A ball transfer assembly includes a steel ball that rotates within a housing having a collar for centering the ball within the housing and a removable plug that forms a seat for the ball and retains the ball and collar within the housing. The plug has a snap lock arrangement with the housing that permits it to be removable allowing the assembly to be taken apart and cleaned. A gasket also aids in preventing the accumulation of dust and wood fibers within the housing. A series of ball transfer assemblies may be aligned in an extruded metal rail to form a long beam with equally spaced in-line ball supports each capable of 360.degree. movement. This ball rail can be set adjacent a table saw, moulder, shaper, or band saw to provide control over the movement of sheet material being cut or moved.
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patent: 4706793 (1987-11-01), Masciarelli
patent: 4901971 (1990-02-01), Connelly
patent: 5288151 (1994-02-01), Isert
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