US3920357A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pumping apparatus
Assignee: Case LLC
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Filing: 1974-03-13
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Granted: 1975-11-18
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Expires: 1994-03-13
Abstract
Abstract A pumping apparatus for pumping concrete is disposed herein. The apparatus includes a hopper having a delivery line extending therefrom and a cylinder cooperating with the hopper to deliver concrete through the delivery line. A valve or tube has one end connected to the delivery line and an opposite end located adjacent the cylinder. The tube is movable between two positions so that concrete can be withdrawn from the hopper and then subsequently forced through the delivery line. The tube or valve has agitator means supported thereon and located adjacent the walls of the hopper to force the concrete down into the hopper and maintain the concrete and aggregate in a mixed condition.
Inventors
- 👤 Eugene D Taylor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:01
CPC Classifications
F; F04; F04B; F04B7/00; B; B28; B28C; B28C7/00; B28C7/16; B28C7/162; B28C7/163; F04B15/00; F04B15/02; Y; Y10; Y10S; Y10S417/00; Y10S417/90
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
183 words
Pumping apparatus comprising: a hopper having a bottom wall and side walls for receiving a plastic mass, a delivery line extending from said hopper, a pump cylinder having one end in communication with said hopper, said cylinder having a piston reciprocated therein, pummp drive means for moving said piston in one direction to withdraw said plastic mass from said hopper into said cylinder and in an opposite direction to force said plastic mass from said cylinder, a valve in said hopper, said valve having one open end connected to said delivery line and an opposite open end, moving means connected to said valve for reciprocating said valve between two positions, said valve connecting said cylinder to said delivery line in one position and placing said cylinder in communication with said hopper in the other position, and agitating mechanism movable with said valve for agitating the plastic mass, said agitating mechanism including blade means spaced from said bottom wall and positioned at locations adjacent an opposed pair of said side walls and adjacent an upper edge of said hopper for agitating said plastic mass.
Claim 2
Dependent Claim
183 words
Pumping apparatus comprising: a hopper having a bottom wall and side walls for receiving a plastic mass, a delivery line extending from said hopper, a pump cylinder having one end in communication with said hopper, said cylinder having a piston reciprocated therein, pummp drive means for moving said piston in one direction to withdraw said plastic mass from said hopper into said cylinder and in an opposite direction to force said plastic mass from said cylinder, a valve in said hopper, said valve having one open end connected to said delivery line and an opposite open end, moving means connected to said valve for reciprocating said valve between two positions, said valve connecting said cylinder to said delivery line in one position and placing said cylinder in communication with said hopper in the other position, and agitating mechanism movable with said valve for agitating the plastic mass, said agitating mechanism including blade means spaced from said bottom wall and positioned at locations adjacent an opposed pair of said side walls and adjacent an upper edge of said hopper for agitating said plastic mass.
Claim 3
Dependent Claim
68 words
Pumping apparatus as defined in claim 1, in which said cylinder is in communication with said hopper adjacent said bottom wall and in which said agitating mechanism carried by said valve includes a scraper arm secured to said valve and spaced therefrom, said scraper arm being located adjacent the bottom wall for moving said plastic mass relative to said bottom wall as said valve is moved between positions.
Claim 4
Dependent Claim
195 words
Pumping apparatus comprising: a hopper having a bottom wall and side walls for receiving a plastic mass, a delivery line extending from said hopper, a pump cylinder having one end in communication with said hopper, said cylinder having a piston reciprocated therein, pump drive means for moving said piston in one direction to withdraw said plastic mass from said hopper into said cylinder and in an opposite direction to force said plastic mass from said cylinder, a valve in said hopper, said valve having one open end connected to said delivery line and an opposite open end, moving means connected to said valve for reciprocating said valve between two positions, said valve connecting said cylinder to said delivery line in one position and placing said cylinder in communication with said hopper in the other position, and agitating mechanism carried by said valve and movable therewith for agitating the plastic mass and said valve is moved between said positions, said agitating mechanism including a blade secured to said valve and positioned at a location adjacent one of said side walls, said blade being adapted for agitating said plastic mass adjacent an upper edge of said hopper.
Claim 5
Dependent Claim
195 words
Pumping apparatus comprising: a hopper having a bottom wall and side walls for receiving a plastic mass, a delivery line extending from said hopper, a pump cylinder having one end in communication with said hopper, said cylinder having a piston reciprocated therein, pump drive means for moving said piston in one direction to withdraw said plastic mass from said hopper into said cylinder and in an opposite direction to force said plastic mass from said cylinder, a valve in said hopper, said valve having one open end connected to said delivery line and an opposite open end, moving means connected to said valve for reciprocating said valve between two positions, said valve connecting said cylinder to said delivery line in one position and placing said cylinder in communication with said hopper in the other position, and agitating mechanism carried by said valve and movable therewith for agitating the plastic mass and said valve is moved between said positions, said agitating mechanism including a blade secured to said valve and positioned at a location adjacent one of said side walls, said blade being adapted for agitating said plastic mass adjacent an upper edge of said hopper.
Claim 6
Dependent Claim
49 words
Pumping apparatus as defined in claim 3, in which said agitating mechanism carried by said valve includes a second blade secured to said valve and positioned adjacent the other of said sidewalls, said second blade being adapted for agitating said plastic mass as said valve is moved between positions.
Claim 7
Dependent Claim
58 words
Pumping apparatus as defined in claim 3, further including circuit means cooperating with said drive means for said piston and said moving means forreversing the position of said valve as said piston reaches extreme positions and means in said circuit means foR continuing reversal of the position of said drive means while interrupting the motion of said piston.
Claim 8
Dependent Claim
50 words
Pumping apparatus as defined in claim 4, in which said agitating mechanism includes a scraper arm secured to said valve and spaced therefrom, said scraper arm being located adjacent said bottom wall for moving said plastic mass relative to said bottom wall as said valve is moved between said positions.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-17 | 1979-05-19 | 1979-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-17 | 1983-05-19 | 1983-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-17 | 1987-05-19 | 1987-11-18 | $7700.00 | Window Closed / Lapsed |