Miscellaneous hardware (e.g. – bushing – carpet fastener – caster – Checks and closers – Spring and flexible link
Patent
1991-01-07
1991-12-31
Spruill, Robert L.
Miscellaneous hardware (e.g., bushing, carpet fastener, caster,
Checks and closers
Spring and flexible link
16 49, E05C 1702, E05C 1734
Patent
active
050759230
ABSTRACT:
A door positioning device comprising a housing concealed in a door jamb and a mechanism mounted in the housing for holding the door open in one or more selected positions. The mechanism comprises a cylinder mounted in the housing wherein a slidable piston is mounted. Linkage connects the piston to linkage mounted onto the door, in such a way that when the door opens, the linkage forces the piston upward in the cylinder. A shaft integral with the piston depends from the piston and is moveable with it. The shaft has a plurality of vertically spaced roller receiving recesses formed thereon. The housing has a movably mounted roller biased toward the shaft so as the door opens, the shaft moves upward in the cylinder until the roller moves into one of the vertically spaced recesses whereby the door is held open at a selected position. In this way when a slight pressure is exerted on the door it overcomes bias holding the roller in a recess formed in the shaft, allowing the door to close.
REFERENCES:
patent: 1020033 (1912-03-01), Flynn
patent: 1759474 (1930-05-01), Volquardsen
patent: 1898609 (1933-02-01), Anderson
patent: 1905972 (1933-04-01), Foster
patent: 1962291 (1934-06-01), Anderson
patent: 4048695 (1977-09-01), Juilfs et al.
patent: 4297812 (1981-11-01), McPhail
patent: 4639969 (1987-02-01), Obenshain
Gurley Donald M.
Rubinstein Julius
Spruill Robert L.
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