Implements or apparatus for applying pushing or pulling force – Portable implements or apparatus for tensioning flexible... – Including either force transmitting – hand held and operated...
Reexamination Certificate
2006-01-24
2006-01-24
Marcelo, Emmanuel (Department: 3654)
Implements or apparatus for applying pushing or pulling force
Portable implements or apparatus for tensioning flexible...
Including either force transmitting, hand held and operated...
C254S261000
Reexamination Certificate
active
06988714
ABSTRACT:
A lift mechanism for use in raising ground trench covers includes an axially extending housing, a cam located at one end of the housing, and a latch located at the other end of the housing. Rotational cam movement drives movement of the latch between retracted and actuated positions. The cam is connected to a latch driving mechanism, which may include springs and/or cables of unequal strength and/or unequal length. A method for using the lift mechanism is also disclosed.
REFERENCES:
patent: 543290 (1895-07-01), Cardwell
patent: 728393 (1903-05-01), Hoagland
patent: 740630 (1903-10-01), Darst
patent: 791807 (1905-06-01), Mossman
patent: 1057534 (1913-04-01), Ethridge
patent: 1488180 (1924-03-01), Wallen
patent: 2221277 (1940-11-01), Thompson
patent: 5588342 (1996-12-01), Ahlgren et al.
Lucasey Manufacturing Co.
Marcelo Emmanuel
Niro Scavone Haller & Niro
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