Lever arm assembly

Details Lever arm assembly Lever arm assembly

1977-12-01

1980-01-22

Scott, Samuel

Machine element or mechanism

Control lever and linkage systems

Elements

85 1R, 85 50B, 248316E, 403374, F16B 4300, F16B 2900, F16B 3500

Patent

active

041843827

ABSTRACT:
A new and improved lever arm apparatus for door closers and the like is adapted to be detachably mounted on a rotary shaft and includes a lever arm formed of a thin piece of flat metal having a key-shaped opening dimensioned to receive a portion of the shaft extended transversely between opposite faces of the arm. A wedge plate or hub is adapted to be detachably mounted on one face of the lever arm and is also formed with a key-shaped opening for receiving a shaft. At least one removable fastener is provided for securing the wedge plate to the lever arm at a point outwardly of the openings and the hub or wedge plate includes a sloping cam surface engaged by the fastener for rotatably shifting the relative positions of the lever arm and wedge plate to tightly clamp the flatted surface of the key-shaped openings against the rotary shaft with a scissors-type pinching action.

REFERENCES:
patent: 1322624 (1919-11-01), Rosenblatt
patent: 2217656 (1940-10-01), Boehme
patent: 3006443 (1961-10-01), Siler
patent: 3008368 (1961-11-01), Hammitt et al.
patent: 3672710 (1972-06-01), Kroopp
patent: 4025210 (1977-05-01), Johnson

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