US3561610A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Boom stop
Assignee: Eastman Kodak Co
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Filing: 1969-04-28
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Granted: 1971-02-09
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Expires: 1989-04-28
Abstract
Abstract An improved safety device on a crane for preventing the crane boom from falling backward onto the crane cab. A push rod is positioned for engagement with the boom when the boom reaches a substantially vertical elevation. The movement of the rod caused by the upwardly moving boom is multiplied through a system of levers and imparted to a contact lever which pushes the boom control stick into a neutral position thereby stopping the boom before it moves past the maximum safe elevation.
Inventors
- 👤 Wilfred F Buckert
- 👤 Frederick L Thompson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:11
CPC Classifications
B; B66; B66C; B66C23/00; B66C23/88; B66C23/92
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
157 words
In a crane having a boom and means for elevating said boom in response to the movement of a boom control stick, an improved device for stopping the elevating of said boom by moving said boom control stick to a predetermined position where said boom movement is stopped, said device comprising: a movable push rod positioned for engagement with and movement by said boom when said boom reaches a predetermined elevation; a contact lever pivotally mounted for engagement with said boom control stick to effect movement of the boom control stick to a position where boom movement is stopped; and lever means responsive to the movement of the push rod for multiplying the distance of movement of said push rod and for imparting said movement of said push rod to said contact lever whereby said contact lever engages the boom control stick to move said boom control stick to a predetermined position where boom movement is stopped.
Claim 2
Dependent Claim
157 words
In a crane having a boom and means for elevating said boom in response to the movement of a boom control stick, an improved device for stopping the elevating of said boom by moving said boom control stick to a predetermined position where said boom movement is stopped, said device comprising: a movable push rod positioned for engagement with and movement by said boom when said boom reaches a predetermined elevation; a contact lever pivotally mounted for engagement with said boom control stick to effect movement of the boom control stick to a position where boom movement is stopped; and lever means responsive to the movement of the push rod for multiplying the distance of movement of said push rod and for imparting said movement of said push rod to said contact lever whereby said contact lever engages the boom control stick to move said boom control stick to a predetermined position where boom movement is stopped.
Claim 3
Dependent Claim
93 words
The invention according to claim 1 wherein said lever means comprises: a pivotally mounted pivot lever having a first and a second end; a connecting rod connected to said second end of said pivot lever and said contact lever; said pivot lever connected at its first end to said push rod and pivoted at a point closer to said first end than said second end so that movement of said push rod causes said second end of said pivot lever to move a greater distance than said first end of said pivot lever.
Claim 4
Dependent Claim
33 words
The invention according to claim 2 wherein said contact lever has a first end and a second end and is pivoted at a point closer to said first end than said second end.
Claim 5
Dependent Claim
15 words
The invention according to claim 2 wherein the length of said connecting rod is adjustable.
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) | 1974-02-08 | 1974-08-10 | 1975-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-08 | 1978-08-10 | 1979-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-08 | 1982-08-10 | 1983-02-09 | $7700.00 | Window Closed / Lapsed |