Patent US3712762A successfully refreshed from Google Patents.
US3712762A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Concrete pump
Assignee: Individual
•
Filing: 1971-03-19
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Granted: 1973-01-23
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Expires: 1991-03-19
Abstract
Abstract A concrete pump having an elongated flexible hose for receiving the concrete, and having rollers which run along the hose to squeeze the hose and thereby pump the concrete through the hose. The hose is disposed in a straight condition, and the rollers are moved along by a chain, and a guide rail positions the rollers against the hose for the squeezing of the hose and the consequent pumping of the concrete through the hose. A gravity-feed hopper with a reciprocating piston fills the hose for charging it with the concrete. Spring-biased fingers assist the hose in regaining its tubular shape after it has been squeezed by the rollers.
Inventors
- 👤 C Kenney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:09
CPC Classifications
F; F04; F04B; F04B43/00; F04B43/12; F04B43/1223; Y; Y10; Y10S; Y10S417/00; Y10S417/90
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
145 words
In a concrete pump of the type having a flexible hose for receiving concrete to be pumped therethrough, and having powered rollers advancing along said hose to squeeze said hose for collapsing it in the pumping process, and having means extending along said hose to engage said hose for placing said hose in its uncollapsed condition when said rollers have passed along said hose to free said hose from squeezing, the improvement comprising said hose being straight throughout the length squeezed by said rollers, straight guide means engaged with said rollers for positioning said rollers through a straight run along said hose in the pumping process, a concrete hopper disposed in concrete feeding position to said hose, a feeder means disposed in said hopper for moving concrete into said hose, and movable connecting means for movably supporting said concrete pump from a concrete mixer vehicle.
Claim 2
Dependent Claim
145 words
In a concrete pump of the type having a flexible hose for receiving concrete to be pumped therethrough, and having powered rollers advancing along said hose to squeeze said hose for collapsing it in the pumping process, and having means extending along said hose to engage said hose for placing said hose in its uncollapsed condition when said rollers have passed along said hose to free said hose from squeezing, the improvement comprising said hose being straight throughout the length squeezed by said rollers, straight guide means engaged with said rollers for positioning said rollers through a straight run along said hose in the pumping process, a concrete hopper disposed in concrete feeding position to said hose, a feeder means disposed in said hopper for moving concrete into said hose, and movable connecting means for movably supporting said concrete pump from a concrete mixer vehicle.
Claim 3
Dependent Claim
134 words
In a concrete pump of the type having a flexible hose for receiving concrete to be pumped therethrough, and having powered rollers advancing along said hose to squeeze said hose for collapsing it in the pumping process, and having means extending along said hose to engage said hose for placing said hose in its uncollapsed condition when said rollers have passed along said hose to free said hose from squeezing, the improvement comprising said hose being straight throughout the length squeezed by said rollers, straight guide means engaged with said rollers for positioning said rollers through a straight run along said hose in the pumping process, a fluid drive system for powering said concrete pump, and said system including pressure limit means for interrupting the drive power when the pumping force exceeds a limit.
Claim 4
Dependent Claim
134 words
In a concrete pump of the type having a flexible hose for receiving concrete to be pumped therethrough, and having powered rollers advancing along said hose to squeeze said hose for collapsing it in the pumping process, and having means extending along said hose to engage said hose for placing said hose in its uncollapsed condition when said rollers have passed along said hose to free said hose from squeezing, the improvement comprising said hose being straight throughout the length squeezed by said rollers, straight guide means engaged with said rollers for positioning said rollers through a straight run along said hose in the pumping process, a fluid drive system for powering said concrete pump, and said system including pressure limit means for interrupting the drive power when the pumping force exceeds a limit.
Claim 5
Dependent Claim
158 words
In a concrete pump of the type having a flexible hose for receiving concrete to be pumped therethrough, and having powered rollers advancing along said hose to squeeze said hose for collapsing it in the pumping process, and having means extending along said hose to engage said hose for placing said hose in its uncollapsed condition when said rollers have passed along said hose to free said hose from squeezing, the improvement comprising said hose being straight throughout the length squeezed by said rollers, straight guide means engaged with said rollers for positioning said rollers through a straight run along said hose in the pumping process, a concrete hopper disposed in concrete feeding position to said hose, a feeder means disposed in said hopper for moving concrete into said hose, and said feeder means including a reciprocating member for advancing the concrete into said hose, and drive mechanism operatively connected to said reciprocating member for powering the latter.
Claim 6
Dependent Claim
158 words
In a concrete pump of the type having a flexible hose for receiving concrete to be pumped therethrough, and having powered rollers advancing along said hose to squeeze said hose for collapsing it in the pumping process, and having means extending along said hose to engage said hose for placing said hose in its uncollapsed condition when said rollers have passed along said hose to free said hose from squeezing, the improvement comprising said hose being straight throughout the length squeezed by said rollers, straight guide means engaged with said rollers for positioning said rollers through a straight run along said hose in the pumping process, a concrete hopper disposed in concrete feeding position to said hose, a feeder means disposed in said hopper for moving concrete into said hose, and said feeder means including a reciprocating member for advancing the concrete into said hose, and drive mechanism operatively connected to said reciprocating member for powering the latter.
Claim 7
Dependent Claim
51 words
The concrete pump as claimed in claim 3, including sensing means operatively connected to said drive mechanism for detecting excessive resistance of the concrete in feeding the concrete into said hose and to then reduce the length of the stroke of said reciprocating member for relieving the blockage of the concrete.
Claim 8
Dependent Claim
37 words
The concrete pump as claimed in claim 3, including lock-out means operatively connected to said drive mechanism for securing said feeder means in a retracted position while said pump may be operated in a non-pumping reverse direction.
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) | 1976-01-23 | 1976-07-24 | 1977-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-23 | 1980-07-24 | 1981-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-23 | 1984-07-24 | 1985-01-23 | $7700.00 | Window Closed / Lapsed |