US4212731A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drive device without transmission for producing an elliptical shaking movement
Assignee: Morgardshammar AB
•
Filing: 1978-07-07
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Granted: 1980-07-15
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Expires: 1998-07-07
Abstract
Abstract A drive device for oscillating a spring-suspended device, such as a sieve or transport device, into an elliptical translational movement with a minimum of rotation. Two unequal and eccentrically arranged oscillation masses, rotatably fixed to the device, are rotationally driven each by a motor independent of the other. If the axes of rotation for the two masses are arranged in a certain geometry relative to the center of mass, the device will oscillate with a substantially pure translational, elliptical movement free of tipping movement.
Inventors
- 👤 Hans-Henrik B. Wallin
- 👤 Eric R. Ericsson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:53
CPC Classifications
B; B06; B06B; B06B1/00; B06B1/10; B06B1/16; Y; Y10; Y10T; Y10T74/00; Y10T74/18; Y10T74/18056; Y10T74/18344
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
139 words
Drive device for producing an elliptical oscillating movement in a spring-suspended apparatus, said drive device comprising two oscillation masses eccentrically arranged around individual axes of rotation and rotatable in opposite directions, the product of mass and distance to the respective axis of rotation being different for the two oscillation masses, characterized in that the two oscillation masses are each rotatably arranged independently of the other and are coupled to individual motors with the same nominal rotational speed, and that the center of gravity of the suspended device lies on an Apollonios' circle to the axes of rotation, so determined that the ratio of the distances from the center of gravity to the axes of rotation is inversely proportional to the products of the weights of the respective oscillation masses and their mean distance to the respective axis of rotation.
Claim 2
Dependent Claim
139 words
Drive device for producing an elliptical oscillating movement in a spring-suspended apparatus, said drive device comprising two oscillation masses eccentrically arranged around individual axes of rotation and rotatable in opposite directions, the product of mass and distance to the respective axis of rotation being different for the two oscillation masses, characterized in that the two oscillation masses are each rotatably arranged independently of the other and are coupled to individual motors with the same nominal rotational speed, and that the center of gravity of the suspended device lies on an Apollonios' circle to the axes of rotation, so determined that the ratio of the distances from the center of gravity to the axes of rotation is inversely proportional to the products of the weights of the respective oscillation masses and their mean distance to the respective axis of rotation.
Claim 3
Dependent Claim
34 words
Drive device according to claim 1, characterized in that the ratio between the products of the weights of the oscillation masses and their mean distances to the respective axes of rotation is essentially 2:1.
Claim 4
Dependent Claim
40 words
Drive device according to claim 1 or 2, characterized in that the bisector of those lines which join the center of gravity of the suspended apparatus to the axes of rotation forms essentially a 45° angle with a sieve plane.
References Cited (Backward Citations)
US2542227A
Cited
FR62136E
Cited
US3053379A
Cited
US2938393A
Cited
US3226989A
Cited
CH445166A
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US3659465A
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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) | 1983-07-15 | 1984-01-14 | 1984-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-07-15 | 1988-01-14 | 1988-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-07-15 | 1992-01-14 | 1992-07-15 | $7700.00 | Window Closed / Lapsed |