Source: https://patents.google.com/patent/US6471097B2/en
Timestamp: 2019-03-20 03:52:25
Document Index: 671439351

Matched Legal Cases: ['art 23', 'art 23', 'art 23', 'art 11', 'art 23', 'art 23', 'art 23', 'in fine']

US6471097B2 - Hand-operated pump with a free floating sleeve piston - Google Patents
US6471097B2
US6471097B2 US09/760,038 US76003801A US6471097B2 US 6471097 B2 US6471097 B2 US 6471097B2 US 76003801 A US76003801 A US 76003801A US 6471097 B2 US6471097 B2 US 6471097B2
US09/760,038
US20020003150A1 (en
1997-07-04 Priority to FR97.08526 priority
1998-07-03 Priority to EP98401668.3 priority
1998-07-03 Priority to EP19980401668 priority patent/EP0888824B1/en
2001-01-12 Priority to US09/760,038 priority patent/US6471097B2/en
2001-01-12 Application filed by Aptar France SAS filed Critical Aptar France SAS
2002-01-10 Publication of US20020003150A1 publication Critical patent/US20020003150A1/en
2002-10-29 Publication of US6471097B2 publication Critical patent/US6471097B2/en
This application is a continuation of U.S. patent application Ser. No. 09/346,821, filed Jul. 2, 1999, which is a continuation-in-part of U.S. patent application Ser. No. 08/987,848, filed Dec. 9, 1997.
In accordance with the invention, a free floating piston, indicated by reference number 3, is mounted in a sliding manner on lower part 23 of hollow rod 20. This piston 3 can be displaced in a limited fashion on lower part 23 of hollow rod 20 to fulfill the outlet valve device function. Piston 3 is formed with an appreciably cylindrical sleeve 30 that surrounds the lower part 23 of hollow rod 20. This collar 30 exhibits upper end 33 and lower end 32. In addition, piston 3 forms outer seal lip 31 adapted to slide tightly against the inner wall of pump body 1 in upper part 11. More specifically, piston 3 slides in this inner section of pump body 11 in a part that is situated between shoulder 125 and vent hole 15. Lip seal 31 connects with sleeve 30 by forming shoulder 34. When the pump is in lock position, that which corresponds to FIG. 1, lower end 32 of sleeve 30 is sealingly disposed in the receiver formed by the lower end of lower part 23 of rod 20 and peripheral collar 26 of peripheral compression device 24. The width of the lower end 32 of the inner sleeve 30 is equal to or a little greater than the distance separating the outer surface of inner part 23 of hollow rod 20 and the inner, concentric, peripheral surface 261 of collar 26. Thus, lower end 32 of sleeve 30 is received via clamping and radial compression in the receiver formed by rod 23 and collar 26. There ensues a cylindrical sealing contact of a certain height. Accordingly, the sealing contact that exists between lower end 32 of the sleeve 30 and the collar 26 is broken only when the sleeve 30 has undergone a vertical displacement towards the:top through a distance greater than the height of the contact seal. As a result, the piston must effect lost motion of a certain distance before opening the fluid passage and allowing flow through inner duct 201 and liquid spray diffuser 81.
By pressing against, for example with a finger, hydraulic head 8, the control rod 2 is moved downwardly in pump body 1. In this initial phase of the lowering of the rod, shoulder 34 of piston 3 is moved away from its stop contact with lower edge 42 of ferrule 4, being that this latter element is a stationary pump element. The lowering of control rod 2 into the pump chamber involves a reduction of volume of the latter, and that increases the pressure to bias piston 3 towards the top by sliding on lower part 23 of hollow rod 20. Thus, insofar as control rod 2 is lowered in pump body 1, piston 3 rises on the control rod. The rising of the piston on the rod forces the upper end 33 of sleeve 30 on tapered surface 223 and causes the release of lower end 32 of sleeve.30 from the receiving area defined by collar 26. The movement of piston 3 towards the top on rod 23 takes place until lower end 32 of sleeve 30 is completely released from the receiver, so that there is no longer any sealing contact between the sleeve 30 and collar 26. At this time, the passage is open between the inside of the pump chamber and inner duct 201 of the control rod across grooves 28 and the passages defined between webs 271. Pressurized fluid in the pump chamber consequently can escape through the control rod to nozzle 81 where it is sprayed in fine droplets.
Regarding the venting, outer seal bead or cord 330 of sleeve 30, during the downward movement and further penetration of rod 2, is in tight sliding contact with inner side 43 of ferrule 4. It is only when lip seal 31 of piston 3 comes in contact against shoulder 125 of pump body 1 that the seal cord 330 is carried below, and out of engagement with, inner surface 43 of the ferrule, to allow outer ambient air to flow into the container in which the pump would be mounted because the ambient air can pass between the ferrule and the control rod, over the piston 3, and then through vent hole 15.
a) a pump body defming a pump chamber supplied with an inlet valve;
b) a hollow control rod movable in said pump body between a rest position and a depressed, lower position, said rod biased to said rest position by a return spring within said pump body, said rod comprising an inner lift duct;
d) the rod comprising a stop surface, said piston cooperating with said stop surface during its upward sliding to provide a sealing at this level;
e) said piston comprising a sleeve surrounding said control rod, said sleeve having a lower end in cylindrical sealing contact with said control rod in said rest position and an upper end adapted to function on said stop surface of said rod during the slide of the piston towards the top;
g) the upper end of said sleeve defming an upper circular sealing stop ridge adapted to engage the stop surface of the rod, said outlet valve being defined at least in part by said cylindrical sealing contact which is adapted to be broken by upward sliding of said piston on the rod at such a height that the stop ridge sealingly engages the stop surface before the cylindrical sealing contact of the outlet valve is broken, thus providing a precompression.
US09/760,038 1997-07-04 2001-01-12 Hand-operated pump with a free floating sleeve piston Expired - Lifetime US6471097B2 (en)
FR97.08526 1997-07-04
EP98401668.3 1998-07-03
EP19980401668 EP0888824B1 (en) 1997-07-04 1998-07-03 Manual pump with a free sleeve piston
US09/346,821 Continuation US6209759B1 (en) 1997-07-04 1999-07-02 Hand-operated pump with a free floating sleeve piston
US20020003150A1 US20020003150A1 (en) 2002-01-10
US6471097B2 true US6471097B2 (en) 2002-10-29
US3500761A (en) 1968-07-01 1970-03-17 Cook Chem Co Control valve for hand pumps
FR2563287A3 (en) 1984-04-19 1985-10-25 Sar Spa Hand pump dispensing pressurized pulverized liquid
EP0453357A1 (en) 1990-04-19 1991-10-23 Frédéric Platel Spraying- and metering device
US6209759B1 (en) 2001-04-03