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US3682575A
Expired / Lapsed
US
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Concrete pump
Assignee: Individual
•
Filing: 1970-12-10
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Granted: 1972-08-08
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Expires: 1990-12-10
Abstract
Abstract A concrete pump comprising a pair of hydraulically actuated concrete pumping cylinders, a hopper for receiving a supply of concrete to be pumped, a Y-shaped fitting including a pair of inlets and a single outlet, and a valve coacting with the concrete pumping cylinders, the hopper and the Y-shaped fitting to control the flow of concrete through the pump. The valve includes a valve body and a valve spool shiftable by a single hydraulic cylinder to alternately connect the concrete pumping cylinders to the inlets of the Y-fitting and to the hopper.
Inventors
- 👤 Karl Guddal
- 👤 Gunnar Guddal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:57
CPC Classifications
F; F01; F01L; F01L23/00; F01L25/00; F01L25/08; F04; F04B; F04B1/00; F04B1/02; F04B15/00; F04B15/02; F04B15/023; F04B7/00; F04B7/02; F04B7/0233; F04B7/025; F04B9/00; F04B9/08; F04B9/10; F04B9/109; F04B9/111; F04B9/113; F04B9/115; F04B9/117; F04B9/1176; F04B9/1178; Y; Y10; Y10S; Y10S417/00; Y10S417/90; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86879
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
171 words
A concrete pump comprising a hopper for receiving concrete, a pair of concrete pumping cylinders synchronously operated to be alternately charged with concrete and to alternately discharge concrete therefrom, a Y-shaped discharge fitting having a pair of inlets and a single outlet adapted to be connected to a hose, a valve arranged between said cylinders and the inlets of said fitting for alternately connecting each of the cylinders to said hopper to be charged and to said inlets of said fitting to be discharged, said valve including a valve body having a pair of inlet ports, one communicating with each cylinder, and a pair of outlet ports axially aligned with the inlet ports, one outlet port communicating with each inlet of said fitting, and a valve spool (slidably received) reciprocably movable in said valve body between first and second positions alternately connecting one of the inlet ports with one of said outlet ports and the other of the inlet ports with the hopper and closing the other of the outlet ports.
Claim 2
Dependent Claim
171 words
A concrete pump comprising a hopper for receiving concrete, a pair of concrete pumping cylinders synchronously operated to be alternately charged with concrete and to alternately discharge concrete therefrom, a Y-shaped discharge fitting having a pair of inlets and a single outlet adapted to be connected to a hose, a valve arranged between said cylinders and the inlets of said fitting for alternately connecting each of the cylinders to said hopper to be charged and to said inlets of said fitting to be discharged, said valve including a valve body having a pair of inlet ports, one communicating with each cylinder, and a pair of outlet ports axially aligned with the inlet ports, one outlet port communicating with each inlet of said fitting, and a valve spool (slidably received) reciprocably movable in said valve body between first and second positions alternately connecting one of the inlet ports with one of said outlet ports and the other of the inlet ports with the hopper and closing the other of the outlet ports.
Claim 3
Dependent Claim
37 words
A concrete pump as defined in claim 1, and means for driving said concrete pumping cylinders and said valve spool in synchronism to cause pumping of concrete from the hopper to and through the Y-shaped discharge fitting.
Claim 4
Dependent Claim
37 words
A concrete pump as defined in claim 1, and means for driving said concrete pumping cylinders and said valve spool in synchronism to cause pumping of concrete from the Y-shaped discharge fitting to and into the hopper.
Claim 5
Dependent Claim
143 words
A concrete pump as defined in claim 1, wherein said valve body includes front and back opposed walls, the inlet ports being in the back wall, and the outlet ports being in the front wall, and said valve spool including spaced front and back plates interconnected to move together and respectively sliding against the front and back walls of the valve body, a single opening in the front plate adapted to be alternately in alignment with an outlet port, three openings in the back plate, the center opening being aligned with the opening in the front plate and the outside openings being spaced from the center opening a distance equal to the spacing of the valve body inlet ports, and a tubular member extending between the plates and interconnecting the opening in the front plate with the center opening in the rear plate.
Claim 6
Dependent Claim
24 words
A concrete pump as defined in claim 4, wherein the openings in the spool plates are the same size as the valve body ports.
Claim 7
Dependent Claim
47 words
A concrete pump as defined in cLaim 4, wherein the inlet ports and openings in the back spool plate are larger than the outlet ports and the opening in the front spool plate, and the tubular member is frusto-conical with the large end at the back plate.
Claim 8
Dependent Claim
36 words
A concrete pump as defined in claim 6, wherein the concrete pumping cylinders have a larger outlet diameter than the valve inlet ports, and a frustoconically shaped connecting pipe extends between each cylinder and inlet port.
Claim 9
Dependent Claim
37 words
A concrete pump as defined in claim 1, wherein said valve is positioned horizontally below the hopper and effectively defines the bottom of the hopper, and said valve is fully open to the hopper throughout its length.
Claim 10
Dependent Claim
181 words
A concrete pump as defined in claim 8, wherein the valve body includes front and back opposed walls and end walls all connected to the bottom end of the hopper and a bottom wall, the inlet ports being in the back wall, and the outlet ports being in the front wall, and said valve spool including spaced front and back plates of about the same height as the front and back walls of the valve body and interconnected to move together in sliding relation along the bottom wall and respectively against the front and back walls of the valve body, a single opening in the front plate adapted to be alternately in alignment with an outlet port, three openings in the back plate, the center opening being aligned with the opening in the front plate and the outside openings being spaced from the center opening a distance equal to the spacing of the valve body inlet ports, and a tubular member extending between the plates and interconnecting the opening in the front plate with the center opening in the rear plate.
Claim 11
Dependent Claim
27 words
A concrete pump as defined in claim 9, wherein a bottom plate is provided for the spool extending between and connected to the front and back plates.
Claim 12
Dependent Claim
36 words
A concrete pump as defined in claim 9, wherein tracks are provided in the bottom wall of the valve body in which are guidably received the lower edge portions of the front and back spool plates.
Claim 13
Dependent Claim
46 words
A concrete pump as defined in claim 11, and cross bars extending between and connected to the front and back valve body walls at the upper ends, said cross bars having tracks for guidably receiving the upper edge portions of the front and back spool plates.
Claim 14
Dependent Claim
31 words
A concrete pump as defined in claim 1, wherein quick disconnect means is provided between the valve body and the concrete pumping cylinders, and between the valve body and the Y-fitting.
Claim 15
Dependent Claim
24 words
A concrete pump as defined in claim 1, wherein means is provided to lubricate the engaging surfaces of the valve spool and valve body.
Claim 16
Dependent Claim
106 words
A concrete pump as defined in claim 1, wherein said valve is positioned horizontally below the hopper, said valve body including front and back opposed walls and top and bottom walls and end walls all connected together to define a chamber in which the valve spool operates in coaction therewith, the inlet ports being in the back wall, the outlet ports being in the front wall, a pair of concrete supply ports in the top wall aligned with the inlet and outlet ports, said hopper including a bottom wall having a pair of discharge ports, and connecting pipes between the discharge ports and the supply ports.
Claim 17
Dependent Claim
79 words
A concrete pump as defined in claim 1, wherein each of said concrete pumping cylinders includes a cylindrical casing having a piston slidable therein between opposite ends thereof and connected to a piston rod, and means for driving the pistons of said concrete pumping cylinders including hydraulic cylinders axially aligned therewith, each of said hydraulic cylinders including a cylindrical casing having a piston slidable therein between opposite ends and connected to a piston rod of said concrete pumping cylinder.
Claim 18
Dependent Claim
146 words
A concrete pump as defined in claim 1, wherein each of said concrete pumping cylinders includes a cylindrical casing having a piston slidable therein between opposite ends thereof, means for driving the pistons of said concrete pumpIng cylinders including a driving hydraulic cylinder including a cylindrical casing having a piston slidable therein between opposite ends thereof and connected to a piston rod, a power cylinder including a cylindrical casing having a piston slidable therein and connected to the piston rod of said driving hydraulic cylinder, a fluid connection from each end of said power cylinder, one to each of said concrete pumping cylinders, means connecting the pistons of the concrete pumping cylinders so they move in opposite directions, and hydraulic fluid in the power cylinder and concrete pumping cylinders, whereby operation of the power cylinder causes alternate movement of the pistons in the concrete pumping cylinders.
Claim 19
Dependent Claim
23 words
A concrete pump as defined in claim 1, wherein wear plates are provided on the engaging surfaces of the spool and valve body.
Claim 20
Dependent Claim
23 words
A concrete pump as defined in claim 1, wherein wear rings are provided at the inlet and outlet ports of the valve body.
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) | 1975-08-08 | 1976-02-07 | 1976-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-08 | 1980-02-07 | 1980-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-08 | 1984-02-07 | 1984-08-08 | $7700.00 | Window Closed / Lapsed |