Two-stage transfer bar lift arm

Details Two-stage transfer bar lift arm Two-stage transfer bar lift arm

1991-01-14

1991-10-22

Briggs, William

Metal working

Plural diverse manufacturing apparatus including means for...

Binding or covering and cutting

B23Q 700

Patent

active

050582518

ABSTRACT:
A two-stage lift arm for raising a transfer bar used in a multi-station machining assembly includes a central pivot at which it is mounted for rotation in a vertical plane about a horizontal axis, a primary lift roller spaced a first distance from the central pivot location, a secondary lift roller spaced a second distance from the central pivot location, the second distance being greater than the first distance, and means for positively rotating the lift arm between a first position in which only the primary lift roller contacts the transfer bar, a second position in which both rollers contact the transfer bar, and a third position in which only the second lift roller contacts the transfer bar.

REFERENCES:
patent: 4669607 (1987-06-01), Mason
patent: 4868960 (1989-09-01), Takagi

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