(19)
(11) EP 0 809 028 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
02.06.1999 Bulletin 1999/22

(43) Date of publication A2:
26.11.1997 Bulletin 1997/48

(21) Application number: 97303541.3

(22) Date of filing: 23.05.1997
(51) International Patent Classification (IPC)6: F04B 43/00, F04B 53/22
(84) Designated Contracting States:
DE FR GB IT

(30) Priority: 23.05.1996 US 18623
20.05.1997 US 

(71) Applicant: GRACO INC.
Minneapolis, Minnesota 55434 (US)

(72) Inventors:
  • McKee, Sheila S.
    St Paul, Minnesota 55119 (US)
  • Markusson, Ronald M.
    North Branch, Minnesota 55056 (US)
  • Barnes, Kathleen M.
    Champlin, Minnesota 55316 (US)

(74) Representative: Sturt, Clifford Mark et al
J. MILLER & CO. 34 Bedford Row, Holborn
London WC1R 4JH
London WC1R 4JH (GB)

   


(54) Neutral shaped pump diaphragm


(57) In the invention, the diaphragm for an air-operated double diaphragm pump is molded in an "S" shape which corresponds to the shape of the diaphragm in the center (of the pump stroke) or relaxed position. By allowing the pump to be assembled in this center or relaxed position, the diaphragm need not be flexed in order to perform the pump assembly.






Search report