US3796375A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid spraying devices
Assignee: Societe Technique de Pulverisation SA STEP
•
Filing: 1972-08-10
•
Granted: 1974-03-12
•
Expires: 1992-08-10
Abstract
Abstract A liquid spraying device of the plunger tube type in which a knob on a plunger tube can be depressed to cause the liquid to be sprayed through a nozzle. The plunger tube is surrounded by a piston which it entrains and which is movable in a chamber to expel the liquid through the tube. The tube has orifices in its wall which communicate with the interior of the piston and with the chamber through a valve. The piston has a portion which is elastically and transversely deformable and which in the inoperative condition closes the orifices and also closes the space communicating with the chamber through the valve.
Inventors
- 👤 M Boris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:11
CPC Classifications
B; B05; B05B; B05B11/00; B05B11/01; B05B11/10; B05B11/1001; B05B11/1023; B05B11/1026
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
168 words
A liquid spraying device comprising a passage which can extend into a vessel for the liquid to be sprayed, a pumping chamber connected to the passage through a non return valve, a piston slidable in the chamber, a tube slidable in the piston and adapted to move and entrain the piston, a valve mounted on the end of the tube in the chamber and engaging a seat formed on the piston, at least one orifice in the tube adjacent one end thereof and opening into the interior of the piston, means for biasing the valve against the seat and for closing an opening through which the vessel communicates with the atmosphere, the piston having a portion which is transversely and elastically deformable and which in the inoperative position closes off the orifice and closes a space communicating with the chamber through the valve, that portion of the piston which is fitted over the tube having portions of reduced thickness opposite which the at least one orifice is located.
Claim 2
Dependent Claim
168 words
A liquid spraying device comprising a passage which can extend into a vessel for the liquid to be sprayed, a pumping chamber connected to the passage through a non return valve, a piston slidable in the chamber, a tube slidable in the piston and adapted to move and entrain the piston, a valve mounted on the end of the tube in the chamber and engaging a seat formed on the piston, at least one orifice in the tube adjacent one end thereof and opening into the interior of the piston, means for biasing the valve against the seat and for closing an opening through which the vessel communicates with the atmosphere, the piston having a portion which is transversely and elastically deformable and which in the inoperative position closes off the orifice and closes a space communicating with the chamber through the valve, that portion of the piston which is fitted over the tube having portions of reduced thickness opposite which the at least one orifice is located.
Claim 3
Dependent Claim
37 words
A liquid spraying device as claimed in claim 1, in which the piston is connected to the tube through a lost motion link whereby the tube entrains the piston after the tube has travelled a predetermined distance.
Claim 4
Dependent Claim
30 words
A liquid spraying device as claimed in claim 1 in which the tube carries a control knob comprising a nozzle communicating with the tube and adapted to depress the tube.
Claim 5
Dependent Claim
38 words
A liquid spraying device as claimed in claim 1 in which the means for biasing the valve against its seat and for closing the opening comprises a spring arranged between the valve and the base of the chamber.
Claim 6
Dependent Claim
85 words
A liquid spraying device, which comprises: a. a pumping chamber; b. a piston slidable in the chamber having a seat at one end thereof and having a portion which is transversely and elastically deformable; and c. a tube slidable in the piston and operative to move and entrain the piston, the tube having at least one orifice therein adjacent one end thereof and opening into the interior of the piston, the deformable portion of the piston being operative to selectively open and close the orifice.
Claim 7
Dependent Claim
85 words
A liquid spraying device, which comprises: a. a pumping chamber; b. a piston slidable in the chamber having a seat at one end thereof and having a portion which is transversely and elastically deformable; and c. a tube slidable in the piston and operative to move and entrain the piston, the tube having at least one orifice therein adjacent one end thereof and opening into the interior of the piston, the deformable portion of the piston being operative to selectively open and close the orifice.
Claim 8
Dependent Claim
84 words
A liquid spraying device according to claim 5, further comprising: a. a valve mounted on the end of the tube in the chamber and engaging the piston seat, a space being provided between the seat and the valve communicating with the chamber, the space being closed when the tube is in a first position; and b. means for biasing the valve against the piston seat and for opening the space between the valve and the seat when the tube is in a second position.
Claim 9
Dependent Claim
32 words
A liquid spraying device according to claim 6 wherein the deformable portion of the piston is operative to selectively open and close the orifice when the tube is in the second position.
References Cited (Backward Citations)
US3257961A
Cited
US3331559A
Cited
US3463093A
Cited
US3414169A
Cited
US3500760A
Cited
US3583605A
Cited
US3640470A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-11 | 1977-09-10 | 1978-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-11 | 1981-09-10 | 1982-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-11 | 1985-09-10 | 1986-03-12 | $7700.00 | Window Closed / Lapsed |