US3822604A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Unbalanced vibrator for an oscillating conveyor or a vibrating screen
Assignee: Individual
•
Filing: 1972-06-02
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Granted: 1974-07-09
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Expires: 1992-06-02
Abstract
Abstract Vibratory power unit for vibrating conveyers and screens comprising an asynchronous polyphase motor, at least one pair of associated unbalanced masses disposed on the shaft of said motor, with the first mass of a pair of said unbalanced masses being rigidly fastened to said shaft and with said second mass of said pair being movably arranged relative to said first mass, means for controlling and regulating the conveying rate during conveyer operation by varying the rotational speed of said motor between predetermined minimum and maximum values, said second mass being movably outwardly by centrifugal force against the pressure of spring means, said spring means being prestressed in such a manner that said second mass is, at rotational motor speeds lower than said minimum speed, held in its initial position, and at motor speeds between said lower and upper values in positions which are radially offset with respect to the axis of said motor to an extent depending on the value of said rotational motor speed.
Inventors
- 👤 K Grimmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:37
CPC Classifications
B; B06; B06B; B06B1/00; B06B1/10; B06B1/16; B06B1/161; B06B1/162; B06B1/164; B65; B65G; B65G27/00; B65G27/10; B65G27/16; B65G27/18; B65G27/20; Y; Y10; Y10T; Y10T74/00; Y10T74/18; Y10T74/18544; Y10T74/18552
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
207 words
A vibratory power unit comprising a pair of associated unbalanced masses adapted to be carried by the rotatable drive shaft of a prime mover, the first of said masses being of generally T-shape in transverse cross section and adapted to be rigidly fastened to such a drive shaft, the second mass of said masses having a generally U-shaped portion in transverse cross section, and a portion connecting the free ends of said U-shaped portion, said second mass being movable radially outwardly relative to said first mass, said connecting portion having an opening therein of a size to receive the leg portion of said Tshaped mass with the cross portions of the latter disposed within said U-shaped portion, elongated guide means carried by said cross portions disposed in respective bores in the intermediate part of said U-shaped portion, and spring means disposed between the respective cross portions and said connecting portion, operative to normally maintain said second mass in its inward position, said spring means being compressible during rotation of the unit in response to centrifugal forces acting on said second mass, whereby the latter may assume radially outwardly offset positions imparting eccentric vibratory action to the unit, which varies with the rotational speed of the drive shaft.
Claim 2
Dependent Claim
207 words
A vibratory power unit comprising a pair of associated unbalanced masses adapted to be carried by the rotatable drive shaft of a prime mover, the first of said masses being of generally T-shape in transverse cross section and adapted to be rigidly fastened to such a drive shaft, the second mass of said masses having a generally U-shaped portion in transverse cross section, and a portion connecting the free ends of said U-shaped portion, said second mass being movable radially outwardly relative to said first mass, said connecting portion having an opening therein of a size to receive the leg portion of said Tshaped mass with the cross portions of the latter disposed within said U-shaped portion, elongated guide means carried by said cross portions disposed in respective bores in the intermediate part of said U-shaped portion, and spring means disposed between the respective cross portions and said connecting portion, operative to normally maintain said second mass in its inward position, said spring means being compressible during rotation of the unit in response to centrifugal forces acting on said second mass, whereby the latter may assume radially outwardly offset positions imparting eccentric vibratory action to the unit, which varies with the rotational speed of the drive shaft.
Claim 3
Dependent Claim
54 words
Vibratory power unit according to claim 1 wherein the center of gravity of the system comprising said first and second unbalanced masses and said spring means is disposed, when said second mass is in its initial position, at the rotational axis of said motor shaft and on the axis of symmetry of said masses.
Claim 4
Dependent Claim
53 words
Vibratory power unit according to claim 2 wherein the difference in length of the spring means in its normal and its prestressed state is greater than the distance between the axis of said motor shaft and the center of gravity of said second mass, when said mass is disposed in its initial position.
Claim 5
Dependent Claim
44 words
Vibratory power unit according to claim 1 wherein the spring constant of said spring means is unequal to the product of the mass of said second unbalanced mass and the square of the angular velocity corresponding to the rated rotational speed of said motor.
Claim 6
Dependent Claim
35 words
Vibratory power unit according to claim 1 wherein stop means are provided between said masses for limiting relative movement of the masses away from each other when said motor rotates at its rated rotational speed.
Claim 7
Dependent Claim
28 words
Vibratory power unit according to claim 5 wherein means for supporting the free ends of said spring means are so configurated that they also act as stop means.
Claim 8
Dependent Claim
27 words
Vibratory power unit according to claim 6 wherein at least one of the abutting faces of said stop means is cOvered by a layer of resilient material.
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) | 1977-07-08 | 1978-01-07 | 1978-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-08 | 1982-01-07 | 1982-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-08 | 1986-01-07 | 1986-07-09 | $7700.00 | Window Closed / Lapsed |