Movable or removable closures – With means mounting closure for reciprocation
Patent
1989-03-17
1990-01-09
Kannan, Philip C.
Movable or removable closures
With means mounting closure for reciprocation
16 81, E05D 1506, E05F 100
Patent
active
048919110
ABSTRACT:
An automatic closing device adapted for attachment to a sliding door having upper and lower horizontal frame members and supported between upper and lower track members is disclosed. The closing device comprises an elongated tubular member containing a counterweight that maintains an air tight seal as it moves up and down within the tubular member. A flexible cable attached at one end to the counterweight is anchored at its opposite end to an upper track member at a preselected location. An upper end element fits into the tubular member and has a pulley wheel for supporting the cable between its ends. A lower end element that fits into the lower end of the tubular member forms an air tight seal for a variable chamber below the counterweight. This lower end element has a check valve for allowing outside air to flow into the chamber while preventing air from flowing out of the chamber and it also supports a separate, adjustable bleed valve for allowing air to flow out of the chamber at a restricted rate so as to control the downward travel of the counterweight within the tubular member when the door is closing.
REFERENCES:
patent: 621670 (1899-03-01), Hinds
patent: 1024059 (1912-04-01), Brintnall
patent: 3334444 (1967-08-01), Hargrove
patent: 4003102 (1977-01-01), Hawks et al.
patent: 4126912 (1978-11-01), Johnson
patent: 4649598 (1987-03-01), Kinsey et al.
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