US3554395A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crane
Assignee: Individual
•
Filing: 1969-04-25
•
Granted: 1971-01-12
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Expires: 1989-04-25
Abstract
Abstract An automatic yard crane for lifting and moving materials. A loading arm extends above a generally flat, hollow body. The body is divided into a number of enclosed chambers having removable access covers for adding and removing granular ballast. An internal combustion engine drives a first pump for supplying pressurized fluid to a hydraulic drive motor and a second pump for supplying pressurized fluid to hydraulic pistons for operating the loading arm.
Inventors
- 👤 Glenn G Dunbar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:56
CPC Classifications
B; B66; B66C; B66C13/00; B66C13/18; B66C2700/00; B66C2700/06; B66C2700/062; B66C2700/065
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
198 words
A crane comprising, in combination, a horizontally extending body having a generally flat upper surface, said body defining a plurality of enclosed chambers for receiving ballast, removable means for access to said enclosed chamber for adding and removing such ballast, front and rear pairs of wheels, means attaching said wheels below said body, hydraulic means for turning said rear pair of wheels for steering said yard crane, means for driving at least one wheel of the front pair of wheels, a loading arm including an elongated mast and inner and outer elongated booms, means rotatably mounting said mast on said body, said mast extending vertically above said body from a location adjacent the front end of said body, hydraulic means for rotating said mast, means pivotally attaching one end of said inner boom to the upper end of said mast, hydraulic means for pivoting said inner boom with respect to said mast, means pivotally attaching one end of said outer boom to the other end of said inner boom, hydraulic means for pivoting said outer boom with respect to said inner boom, an implement, and means for attaching said implement to the other end of said outer boom.
Claim 2
Dependent Claim
198 words
A crane comprising, in combination, a horizontally extending body having a generally flat upper surface, said body defining a plurality of enclosed chambers for receiving ballast, removable means for access to said enclosed chamber for adding and removing such ballast, front and rear pairs of wheels, means attaching said wheels below said body, hydraulic means for turning said rear pair of wheels for steering said yard crane, means for driving at least one wheel of the front pair of wheels, a loading arm including an elongated mast and inner and outer elongated booms, means rotatably mounting said mast on said body, said mast extending vertically above said body from a location adjacent the front end of said body, hydraulic means for rotating said mast, means pivotally attaching one end of said inner boom to the upper end of said mast, hydraulic means for pivoting said inner boom with respect to said mast, means pivotally attaching one end of said outer boom to the other end of said inner boom, hydraulic means for pivoting said outer boom with respect to said inner boom, an implement, and means for attaching said implement to the other end of said outer boom.
Claim 3
Dependent Claim
136 words
A crane, as defined in claim 1, wherein said means for driving at least one wheel is a hydraulic motor, and including a first pump for supplying pressurized hydraulic fluid to said hydraulic motor, means for controlling the flow of hydraulic fluid from said first pump to said hydraulic motor, a second pump for supplying pressurized hydraulic fluid to said loading arm, means for controlling the flow of hydraulic fluid from said second pump to said hydraulic means for rotating said mast, means for controlling the flow of hydraulic fluid from said second pump to said hydraulic means for pivoting said inner boom, means for controlling the flow of hydraulic fluid from said second pump to said hydraulic means for pivoting said outer boom, and an internal combustion engine for driving said first and second pumps.
Claim 4
Dependent Claim
74 words
A crane, as defined in claim 2, wherein said means for controlling the flow of hydraulic fluid from said first pump to said hydraulic motor includes a pair of foot operated valves, one of said valves controlling the flow of hydraulic fluid to said motor for controlling forward movement of the crane and the other of said valves controlling the flow of hydraulic fluid to said motor for controlling reverse movement of the crane.
Claim 5
Dependent Claim
53 words
An automatic yard crane, as defined in claim 3, wherein said means for attaching said implement to the other end of said outer boom includes hydraulic means for rotating said implement, and further including means for controlling flow of hydraulic fluid from said second pump to said hydraulic means for rotating said implement.
Claim 6
Dependent Claim
36 words
A crane, as defined in claim 4, wherein said implement is a hoisting fork means including support arms for lifting a pallet, said hoisting fork means having means for varying the pitch of said support arms.
Claim 7
Dependent Claim
46 words
A crane, as defined in claim 5, wherein said means for attaching said hoisting fork means to said outer boom further includes an extension boom telescopically attached to said outer boom, and hydraulic means for axially positioning said extension boom with respect to said outer boom.
Claim 8
Dependent Claim
48 words
A crane, as defined in claim 2, wherein said means for attaching said implement to the other end of said outer boom further includes an extension boom telescopically attached to said outer boom, and hydraulic means for axially positioning said extension boom with respect to said outer boom.
Claim 9
Dependent Claim
127 words
An automatic yard crane comprising, in combination, a body having a generally flat upper surface, said body defining a plurality of chambers for receiving ballast, a front axle positioned beneath the front end of said body, a pair of front wheels mounted on opposed ends of said front axle, drive means for driving at least one of said front wheels, said drive means including a hydraulic motor operatively connected to at least one of said front wheels, a pair of rear wheels mounted for turning movement beneath the rear end of said body, steering means including hydraulic cylinders operatively connected to said rear wheels for turning said rear wheels, and a loading arm extending vertically above said body from a location adjacent the front of said body.
Claim 10
Dependent Claim
127 words
An automatic yard crane comprising, in combination, a body having a generally flat upper surface, said body defining a plurality of chambers for receiving ballast, a front axle positioned beneath the front end of said body, a pair of front wheels mounted on opposed ends of said front axle, drive means for driving at least one of said front wheels, said drive means including a hydraulic motor operatively connected to at least one of said front wheels, a pair of rear wheels mounted for turning movement beneath the rear end of said body, steering means including hydraulic cylinders operatively connected to said rear wheels for turning said rear wheels, and a loading arm extending vertically above said body from a location adjacent the front of said 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) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |