The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 04, 1991
Filed:
Nov. 27, 1989
Miro S Cater, Newtown, CT (US);
RJS Industries, Inc., Marlboro, NJ (US);
Abstract
A vertical hollow body has a first upper hollow vertical cylinder and a second lower hollow outer vertical cylinder. A third inner hollow vertical cylinder is disposed concentrically within and spaced from the second cylinder. The lower ends of the first and second cylinders are joined. The upper end of the third cylinder has an aperture. A hollow piston is vertically movable within the first cylinder. A vertical member has an upper section extending into the piston interior, an enlarged middle section and a fourth vertical hollow cylinder as an enlarged lower section. The fourth cylinder has an inner shoulder at its upper end. A spring is disposed between and bears against the joined lower ends and the shoulder. A pump chamber is defined by a hollow vertical region bounded by adjacent portions of the body, member and piston and has a first fluid entry port and a second fluid discharge port. An actuator device is disposed above and engages the piston to open the second port and close the first port on the downward stroke and to open the first port and close the second port on the upward stroke.