Cable sash interlock

Details Cable sash interlock Cable sash interlock

1992-08-18

1993-09-07

Kannan, Philip C.

Movable or removable closures

Closures interconnected for concurrent movement

Closures in spaced openings along barrier

49 99, 49445, 454 62, E05F 1700

Patent

active

052417883

ABSTRACT:
For a laboratory fume hood where two sashes are provided and the total open area through the sashes must be regulated, a counterweight system having a dedicated counterweight for each sash and having the respective counterweights connected together by a cross cable draped over pulleys arranged above each respective counterweight. The cross cable has a preselected length to have a selected length of slackness which is equivalent to the total aggregate regulated travel of either or both sashes. Thus, one sash can be opened 100% or two sashes can be opened 50%.

REFERENCES:
patent: 1896423 (1933-02-01), Ross
patent: 2014329 (1935-09-01), Hellmann
patent: 2112347 (1938-03-01), Ross
patent: 2207148 (1940-07-01), Hall
patent: 3025780 (1962-03-01), Russell
patent: 3726206 (1973-04-01), Worick, Jr.
patent: 3934496 (1976-01-01), Turko
patent: 4385551 (1983-05-01), Zboralski
patent: 4548128 (1985-10-01), Morikawa et al.
patent: 4829887 (1989-05-01), Holschbach

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