Title: Door closer with assist or door operating features

Abstract: Hydraulic door closer apparatus includes means for counter-balancing the bias of a return spring, to either assist in opening the door by reducing the force needed to open, or, in an alternative embodiment and mode of operation, to open the door by over-balancing the bias of the return spring. In the latter mode, a remotely manually operable switch, such as, for example, a so-called palm button, may initiate opening the door.

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Inventors: Burnett, Jr., L. Nelson (Pottstown, PA, US)

Application Number: 888217
Filing Date: 1978-03-20
Publication_date: 1980-09-16
Assignee: Reading Door Closer Corp. (Reamstown, PA)
Primary Class(es): 16/62 16/64, 49/13
Other Classes:
US Patent Ref:

2190653	Feb, 1940	Dunn.
2276338	Mar, 1942	Potter et al.
2758835	Aug, 1956	Wikkerink.
2900791	Aug, 1959	Kinsey	49/30.
3003317	Oct, 1961	Schroeder et al.	49/26.
3087720	Apr, 1963	Catlett.
3195879	Jul, 1965	Bond et al.	49/30.
3247615	Apr, 1966	Kalog	49/30.
3269061	Aug, 1966	Massina.
3302330	Feb, 1967	Loftus	49/30.
3319380	May, 1967	Loftus	49/30.
3323255	Jun, 1967	Sweetland et al.
3425161	Feb, 1969	Catlett et al.
3478468	Nov, 1969	Martin.
3696462	Oct, 1972	Martin.
3729770	May, 1973	Lasier.
3874117	Apr, 1975	Boehm.
3875612	Apr, 1975	Poitras.
3934306	Jan, 1976	Farris.
4010572	Mar, 1977	Peterson	16/62.
4019220	Apr, 1977	Lieberman.
4040144	Aug, 1977	Lasier	16/66.
4050114	Sep, 1977	Zunkel	16/51.

Other Refs: 1037549

Jul, 1966	GB.

Primary Examiner: Krizmanich, George H.
Assistant Examiner:
Attorney: Podwil; Robert C.