Patent US3596785A successfully refreshed from Google Patents.
US3596785A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for loading and unloading objects
Assignee: Individual
•
Filing: 1969-07-10
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Granted: 1971-08-03
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Expires: 1989-07-10
Abstract
Abstract A telescoping continuous conveyor belt assembly is mounted in a compact unit. Wheels may be provided for portability to load and unload heavy objects from trucks and other vehicles. The device telescopes into a trailer or other remote location from a point outside the vehicle to be loaded or unloaded or removed from the remote location. By using pneumatic or hydraulic cylinders opposing each other, the slack is kept out of the conveyor belt. Pneumatic or hydraulic cylinder operated scissor-type cradles may be provided at each end of the belt conveyor to raise or lower the objects being loaded or unloaded as the operator desires. The device may be arranged on a pivot. Pneumatic or hydraulic cylinders may be provided at the end of the conveyor which is extended within the vehicle or to the remote location to automatically move the end of the belt to one side of the vehicle or the other or along an arc at the remote location as desired.
Inventors
- 👤 Tom M Weatherford Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:28
CPC Classifications
B; B65; B65G; B65G21/00; B65G21/10; B65G21/14
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
210 words
A device for loading and unloading objects including in one unit means for conveying the objects from one point to another point, said means including a continuous conveyor belt and means for imparting motion to the cOntinuous conveyor belt, said conveying means being extensible to a remote location and retractable back to the original position without any slack occurring in the conveyor belt during retraction and extension, in which the means for extending the continuous conveyor belt includes at least one telescoping cylinder and including telescoping horizontal extension guides for supporting the continuous conveyor belt when it is extended, in which the means for retracting the conveyor belt, taking up the slack in the conveyor belt as the belt is retracted, and playing out additional conveyor belt as the belt is extended includes rotating wheels on which the belt is stored and from which the belt is fed, some of said wheels being stationary and the others of said wheels moving vertically to and from the stationary wheels as the belt is extended and retracted respectively, and in which the wheels moving in a vertical plane are mounted on a platform and are moved from the stationary wheels by means of at least one tension cylinder connected to the platform.
Claim 2
Independent Claim
210 words
A device for loading and unloading objects including in one unit means for conveying the objects from one point to another point, said means including a continuous conveyor belt and means for imparting motion to the cOntinuous conveyor belt, said conveying means being extensible to a remote location and retractable back to the original position without any slack occurring in the conveyor belt during retraction and extension, in which the means for extending the continuous conveyor belt includes at least one telescoping cylinder and including telescoping horizontal extension guides for supporting the continuous conveyor belt when it is extended, in which the means for retracting the conveyor belt, taking up the slack in the conveyor belt as the belt is retracted, and playing out additional conveyor belt as the belt is extended includes rotating wheels on which the belt is stored and from which the belt is fed, some of said wheels being stationary and the others of said wheels moving vertically to and from the stationary wheels as the belt is extended and retracted respectively, and in which the wheels moving in a vertical plane are mounted on a platform and are moved from the stationary wheels by means of at least one tension cylinder connected to the platform.
Claim 3
Dependent Claim
68 words
A device for loading and unloading objects as described in claim 1 in which extension of the continuous conveyor belt is effected by setting the pressure on the telescoping cylinders at a higher pounds per square inch than the pressure on the tension cylinders so that the platform is moved vertically towards the stationary wheels thus playing out conveyor belt as the telescoping horizontal extension guide is extended.
Claim 4
Dependent Claim
71 words
A device for loading and unloading objects as described in claim 1 in which retraction of the continuous conveyor belt without slack is effected by maintaining the pressure on the telescoping cylinder at a lower pounds per square inch than the pressure on the tension cylinder so that the platform is moved vertically away from the stationary wheels thus taking up conveyor belt as the telescoping horizontal extension guide is retracted.
Claim 5
Dependent Claim
22 words
A device for loading and unloading objects as described in claim 1 in which the telescoping and tension cylinders are pneumatic cylinders.
Claim 6
Dependent Claim
22 words
A device for loading and unloading objects as described in claim 1 in which the telescoping and tension cylinders are hydraulic cylinders.
Claim 7
Dependent Claim
33 words
A device for loading and unloading objects as described in claim 1 including means automatically adjustably raised and lowered for receiving the objects to be conveyed and carrying them to the conveying means.
Claim 8
Dependent Claim
34 words
A device for loading and unloading objects as described in claim 1 including means automatically adjustably raised and lowered for receiving the objects being conveyed at their destination and lifting them into unloading position.
Claim 9
Dependent Claim
44 words
A device for loading and unloading objects as described in claim 1 including means for pivoting the conveying means so that the objects being conveyed can be loaded and unloaded at different points along the arc of the extended limit of the conveying means.
Claim 10
Dependent Claim
22 words
A device for loading and unloading objects as described in claim 1 in which the continuous conveyor belt is a chain belt.
Claim 11
Dependent Claim
25 words
A device for loading and unloading objects as described in claim 9 in which the wheels are sprockets with teeth which engage the chain belt.
Claim 12
Dependent Claim
42 words
A device for loading and unloading objects as described in claim 1 in which the means for imparting motion to the continuous conveyor belt includes a motor driving a pulley coacting with a wheel on which the continuous conveyor belt is mounted.
Claim 13
Dependent Claim
30 words
A device for loading and unloading objects as described in claim 11 in which the pulley is driven by means of a drive belt which engages the motor drive shaft.
Claim 14
Dependent Claim
29 words
A device for loading and unloading objects as described in claim 1 in which portability of the device is provided by wheels mounted on the bottom of the device.
Claim 15
Dependent Claim
37 words
A device for loading and unloading objects as described in claim 13 including mechanical stops for keeping the wheels mounted to the bottom of the device from rotating when it is desired that the device be stationary.
Claim 16
Dependent Claim
36 words
A device fOr loading and unloading objects as described in claim 1 including legs extending downward from the end of each telescoping horizontal extension guide section for supporting the telescoping extension guides when they are extended.
Claim 17
Dependent Claim
29 words
A device for loading and unloading objects as described in claim 15 including a roller on the end of each leg extending from a telescoping horizontal extension guide section.
Claim 18
Dependent Claim
57 words
A device for loading and unloading objects as described in claim 16 including a swivel mount for the device so that in extended position the extended end of the continuous conveyor belt may be readily moved from side to side on the rollers at the ends of the legs extending from the telescoping horizontal extension guide sections.
Claim 19
Dependent Claim
44 words
A device for loading and unloading objects as described in claim 17 including cylinder means fixed to the extended end of the telescoping horizontal extension guide section to automatically move the extended end of the continuous conveyor belt from one side to the other.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-02 | 1975-02-01 | 1975-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-02 | 1979-02-01 | 1979-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-02 | 1983-02-01 | 1983-08-03 | $7700.00 | Window Closed / Lapsed |