Method and apparatus for extending ventilation ductwork

Details Method and apparatus for extending ventilation ductwork Method and apparatus for extending ventilation ductwork

1985-01-16

1986-12-02

Joyce, Harold

Railways

Droppings catcher

98DIG7, 74 8922, 104182, 138107, 248 61, 254407, E21F 1702

Patent

active

046256318

ABSTRACT:
An apparatus and method for advancing extendable ventilation ductwork in an underground facility is disclosed wherein a mechanical cable and pulley system is utilized in conjunction with a support swivel. The support swivel permits support clips to advance without interference from support members. The cable and pulley system comprises a cable, support swivel, head pulley and winding mechanism.

REFERENCES:
patent: 627563 (1899-06-01), Wright
patent: 952539 (1910-03-01), Lugo-Vina
patent: 1043604 (1912-11-01), Kalmanovits
patent: 2182602 (1939-12-01), Veteran

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