Quick change traveling block

Details Quick change traveling block Quick change traveling block

1977-02-11

1978-07-04

Hoffman, Drayton E.

Implements or apparatus for applying pushing or pulling force

Step-by-step traveling bar

Pawl actuated

254197, B66D 308

Patent

active

040984923

ABSTRACT:
A travelling block system that can be changed quickly from a four support line system to a two support line system, which comprises a travelling block having two sheaves, and a single sheave block with hook, attached to the crown of a boom. The two sheave travelling blocks comprise a frame with two parallel spaced plates serving as inner sheave plates, two sheaves on the outside of the inner sheave plates, and two outer sheave plates. The sheave plates are firmly bolted to the frame, and appropriate sheave pins are supplied through each pair of outer and inner sheave plates. Two guard strips are provided which are removably attached around the periphery of the outer and inner sheave plates so as to completely contain the cable around the sheave on sides and bottom of the sheaves.

REFERENCES:
patent: 276561 (1883-05-01), Clark
patent: 2728552 (1955-12-01), Fate, Jr.
patent: 2800300 (1957-07-01), Johnson et al.
patent: 3936034 (1976-02-01), Larralde

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