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. 19, 1990
Filed:
Oct. 31, 1989
Michael L Nowicki, House Springs, MO (US);
Dema Engineering Company, St. Louis, MO (US);
Abstract
This magnetically operated valve and timer assembly (30) can be used to open a feed line (14) leading to a spray head (22) within a chemical feed block (12) to dispense a chemical solution. The assembly (30) includes a valve (34) having a valve closure plunger (52) which is moved into the open position for a predetermined time under the attraction of a magnet assembly (66) mounted to the valve (34). The time period is determined by timer (36) which is connected to the magnet assembly. The timer (36) includes a cylinder (80) receiving a piston (100) in sliding relation, the piston including a head (102) a rearward shaft (104), having a knob (108), and a forward shaft (106) connected to the magnet assembly. The piston head (102) includes a tapered groove (122) for an annular cup seal (126) which moves into a position in the groove during the forward stroke to facilitate fluid flow past the seal ( 126) from one side of the piston to the other. The seal (126) moves into a different position in the groove (122) to preclude fluid flow past the seal during the return stroke so that fluid must flow through the head by way of restrictive passages (120) thereby retarding the return stroke. The restrictive passages (120) include a metering orifice (140) which is controlled by an adjustable needle (154). The piston chamber (92) includes an enlarged portion (96) to facilitate the timing of the return stroke.