US3992791A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Slope grader with longitudinally movable guide frame
Assignee: Individual
•
Filing: 1975-10-08
•
Granted: 1976-11-23
•
Expires: 1995-10-08
Abstract
Abstract An attachment for a jib crane to enable it to be used for grading and carrying out other work on sloping banks has a more or less horizontal auxiliary jib mounted beneath the main jib of the crane, a carriage movable fore and aft along the auxiliary jib, a guide frame extending forwardly from the carriage, a tool carrier movable in either direction along the length of the guide frame, and a suspension tie connecting the guide frame to the jib of the crane. The tool carriage is provided with a scraper blade or other tool appropriate to an operation to be carried out, and is hauled, usually upwardly, along the guide frame by a cable operated by the winding gear of the crane.
Inventors
- 👤 Americo Dean
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:34
CPC Classifications
E; E02; E02F; E02F5/00; E02F5/22; E02F3/00; E02F3/04; E02F3/46; E02F3/50
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
124 words
A grading attachment for a jib crane, comprising a substantially horizontal auxiliary jib mounted on the crane beneath its main jib, a carriage mounted for fore and aft movement along the auxiliary jib, an elongated guide frame supported by the carriage, said guide frame extending longitudinally forwardly from the carriage at an inclination thereto, and said guide frame having side rails passing through and slidably mounted in sleeves secured to said carriage whereby the guide frame is movable on its longitudinal axis relative to the carriage, a tool carrier mounted for movement in either direction longitudinally along the guide frame, an earthworking tool mounted to and beneath the carrier, and a suspension tie connecting the guide frame to the main jib of the crane.
Claim 2
Dependent Claim
124 words
A grading attachment for a jib crane, comprising a substantially horizontal auxiliary jib mounted on the crane beneath its main jib, a carriage mounted for fore and aft movement along the auxiliary jib, an elongated guide frame supported by the carriage, said guide frame extending longitudinally forwardly from the carriage at an inclination thereto, and said guide frame having side rails passing through and slidably mounted in sleeves secured to said carriage whereby the guide frame is movable on its longitudinal axis relative to the carriage, a tool carrier mounted for movement in either direction longitudinally along the guide frame, an earthworking tool mounted to and beneath the carrier, and a suspension tie connecting the guide frame to the main jib of the crane.
Claim 3
Dependent Claim
19 words
An attachment according to claim 1, wherein the inclination of the guide frame relative to the carriage is adjustable.
Claim 4
Dependent Claim
20 words
An attachment according to claim 1, wherein the carriage itself comprises sleeves slideable on parallel rails forming said auxiliary jib.
Claim 5
Dependent Claim
27 words
An attachment according to claim 3, wherein a hydraulic actuator is provided acting between the auxiliary jib and the carriage to control the position of the latter.
Claim 6
Dependent Claim
37 words
An attachment according to claim 1, wherein hydraulic clamps are provided on said side rails, and hydraulic actuators are provided acting between said clamps and said sleeves, whereby to step the guide frame relative to the sleeves.
Claim 7
Dependent Claim
35 words
An attachment according to claim 1, wherein a cable is provided connecting said tool carrier to a windlass on the crane whereby to enable the latter to haul the latter up the inclined guide frame.
Claim 8
Dependent Claim
35 words
An attachment according to claim 6, wherein the earthworking tool is a scraper blade hingedly mounted to the tool carrier whereby to allow the tool to trail as the carrier moves down the guide frame.
Claim 9
Dependent Claim
16 words
An attachment according to claim 1, wherein the guide frame is inclined downwardly from the carriage.
Claim 10
Dependent Claim
26 words
An attachment according to claim 4, wherein a pendulum is suspended from the carriage whereby to enable the latter to be aligned with a string line.
Claim 11
Dependent Claim
16 words
An attachment according to claim 1, wherein a buoyancy tank is attached to the guide frame.
Claim 12
Dependent Claim
32 words
An attachment according to claim 1, wherein the suspension tie is a rigid strut, and brackets pivotally connect the strut to the guide frame and to the main jib of the crane.
References Cited (Backward Citations)
SU249300A1
Cited
US341539A
Cited
US677522A
Cited
US1137171A
Cited
US1640565A
Cited
DE630381C
Cited
US2348796A
Cited
US2334323A
Cited
US2501533A
Cited
US2640286A
Cited
US2833422A
Cited
US2755573A
Cited
US3008251A
Cited
US3044196A
Cited
DE2133365A1
Cited
US3809250A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-11-23 | 1980-05-24 | 1980-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-11-23 | 1984-05-24 | 1984-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-11-23 | 1988-05-24 | 1988-11-23 | $7700.00 | Window Closed / Lapsed |