Machine element or mechanism – Rotary member or shaft indexing – e.g. – tool or work turret – Locking means
Patent
1997-06-30
1999-01-19
Marmor, Charles A.
Machine element or mechanism
Rotary member or shaft indexing, e.g., tool or work turret
Locking means
74816, 74813L, 74136, B23Q 1606, F16H 700
Patent
active
058603336
ABSTRACT:
In the indexing mechanism, for producing rotary indexing of a primary sprocket or pulley, a locking bracket is operable to alternately lock or unlock the primary sprocket or pulley. At the same time, the locking bracket alternately unlocks or locks an endless chain or synchronous belt at a locking location. The chain or synchronous belt passes around the primary sprocket or pulley and past the chain or synchronous belt locking location. The chain or synchronous belt has first and second loops between the primary sprocket or pulley and the chain or synchronous belt locking location, on opposite sides thereof. First and second secondary sprockets or pulleys are mounted on the ends of first and second cylinder rods respectively, each secondary sprocket having one of the loops passing over it. The locking bracket is moved between two positions, to lock either the sprocket or pulley, or the chain or synchronous belt at the locking location. The first and second cylinders are counter-actuated to increase the length of chain or synchronous belt in one loop while decreasing the length of chain or synchronous belt in the other loop by the same amount, so as to pull the chain or synchronous belt to rotate the primary sprocket or pulley while the chain or synchronous belt is locked at its locking location, and so as to return to a starting position when the sprocket or pulley is locked.
REFERENCES:
patent: 642637 (1900-02-01), Small
patent: 2251856 (1941-08-01), Radich
patent: 4354402 (1982-10-01), Scott
Armstrong R. Craig
Battista Mary Ann
Marmor Charles A.
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