Counterbalanced window operators

Details Counterbalanced window operators Counterbalanced window operators

1990-11-28

1992-03-24

Kannan, Philip C.

Movable or removable closures

With means mounting closure for swinging

With biasing means

49324, 74 8914, E05F 110, E05F 1100

Patent

active

050976290

ABSTRACT:
A counterbalanced operator for a pivoting unit includes a housing 17 and a rotatable drive member mounted in the housing. A first end 29a of arm member 29 is operatively connected to the drive member. A second end of the arm member is operatively connected to the pivoting end of the unit and a torque from the unit is transmitted to the arm member. A crank 33 rotates the drive member. A spring 40 provides for a means for counterbalancing the torque on the arm member. The spring 40 creates a force, the spring operatively connected to the arm member and the spring positioned in the housing. The force is transmitted from the spring to the arm member.

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patent: 4521993 (1985-06-01), Tacheny et al.
patent: 4571775 (1986-01-01), Leonard
patent: 4617758 (1986-10-01), Vetter

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