Robert R Pierson

Author:

Robert Pierson

ISBN #:

0838933165

Author:

Robert H. Pierson

ISBN #:

0812702034

Author:

Robert H. Pierson

ISBN #:

0828002444

Author:

Robert H. Pierson

ISBN #:

0828003912

Author:

Robert John Pierson

ISBN #:

0877013128

Author:

Robert D. Pierson

ISBN #:

0687332486

US Patent:

44832524, Nov 20, 1984

Filed:

Sep 28, 1982

Appl. No.:

6/425533

Inventors:

Robert A. Pierson - Farmington Hills MI

Assignee:

Jervis B. Webb Company - Farmington Hills MI

International Classification:

B61B 1002

US Classification:

104172B

Abstract:

A power and free conveyor comprising a power track supporting an endless driven chain to which pusher assemblies are attached, a load track parallel to the power tracks, and carriers mounted on the load track, each carrier having a driving member releasably engageable by a pusher member of a pusher assembly. The conveyor is arranged in a vertical loop having an upright portion in which the power track is above the load track and an inverted portion in which the power track is below the load track. Each pusher assembly includes a pivoted pusher member, a pivoted counterweight member and a one-way connection between these members, the pusher member being biased by its mass into engageable relation with a carrier driving member on the upright portion of the conveyor and being biased into such engageable relation by the mass of the counterweight on the inverted portion of the carrier.