Patent US3772923A successfully refreshed from Google Patents.
US3772923A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Eccentric weight rotary vibrator
Assignee: Individual
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Filing: 1972-03-01
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Granted: 1973-11-20
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Expires: 1992-03-01
Abstract
Abstract An intermittently driven eccentric weight rotary vibrator with matched dual or coaxially concentric weights rotatable relative to each other about a common axis, which eccentric weights normally are urged to assume an additive eccentric position except when rotarily driven at which time the driving forces place the eccentric weights in balance during these alternate driving periods. The attained speeds of the balanced weights are above the critical speed required for vibrating the loaded object to which the rotary vibrator is attached. During the alternate retarding periods, the eccentric weights in their eccentric additive positions transmit their vibratory motion to the loaded object to be vibrated at the critical speed of the same. The driving period represents only a short part of each operating cycle and the retarding periods provide a declining series of spaced critical nodes effective in producing vibrations over a period of approximately one minute. The energy driving or storage period may be one-tenth of the vibratory period with the total cycle being approximately one minute. This improved result is due to the constuction of the vibrator and its parts with very little drain on the energizer, which is usually a motor driven by a battery.
Inventors
- 👤 R Burt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:33
CPC Classifications
B; B06; B06B; B06B1/00; B06B1/10; B06B1/16; B06B1/161; B06B1/162; B06B1/164; Y; Y10; Y10T; Y10T74/00; Y10T74/18; Y10T74/18056; Y10T74/18344
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
158 words
A rotary eccentric vibrator comprising a base for attachment to an object to be vibrated, a rotary shaft means supported in frictionless bearing means mounted on said base to be accelerated, first eccentric weight means fixed on said shaft means, second eccentric weight means mounted on anti-frictional bearings carried by said shaft means to provide a balanced and an eccentric weight system, stop means effective between said first and second eccentric weight means to arrest the position of said second weight means to balance said weight system when said shaft is accelerated, an accelerator drive means energized to accelerate said shaft means to force said second weight against said stop means with said weight means in balance, and cutoff means to make said accelerator drive means ineffective and permit deceleration of said weight system causing their eccentric weights to be additive and transmit their total effective eccentric energy to vibrate the object to which said base is attached.
Claim 2
Dependent Claim
158 words
A rotary eccentric vibrator comprising a base for attachment to an object to be vibrated, a rotary shaft means supported in frictionless bearing means mounted on said base to be accelerated, first eccentric weight means fixed on said shaft means, second eccentric weight means mounted on anti-frictional bearings carried by said shaft means to provide a balanced and an eccentric weight system, stop means effective between said first and second eccentric weight means to arrest the position of said second weight means to balance said weight system when said shaft is accelerated, an accelerator drive means energized to accelerate said shaft means to force said second weight against said stop means with said weight means in balance, and cutoff means to make said accelerator drive means ineffective and permit deceleration of said weight system causing their eccentric weights to be additive and transmit their total effective eccentric energy to vibrate the object to which said base is attached.
Claim 3
Dependent Claim
77 words
The structure of claim 1 characterized in that, each of said eccentric weight means includes an eccentric weight unit comprising, a cylindrical hub for receiving said rotary axis means, a radial circumferential flange extending from one end of said hub, and a rim integral with the perimeter of said radial flange, and having considerable weight for at least a substantial portion of its circumference to form said counterweight means, and to produce a chamber about said hub.
Claim 4
Dependent Claim
44 words
The structure of claim 2 characterized in that each eccentric weight means also includes a pair of eccentric weight units with their matched co-extensive weight sections on each rim secured to each other and to enclose their chambers with their flanges facing axially outwardly.
Claim 5
Dependent Claim
29 words
The structure of claim 1 characterized in that said first and second eccentric weight means represent an outer and inner rotary eccentric unit selectively enclosing one within the other.
Claim 6
Dependent Claim
161 words
The eccentric weight structure of claim 1 wherein said second pair of matched eccentric weight units are secured to said shaft means comprising said rotary axis means and their chambers facing the radial flanges of said first pair of matched eccentric weight units, said means to limit the relative movement between said eccentric weight means including a stop means in said chamber of one eccentric weight unit of said second pair of matched eccentric weight units and a relatively movable stop means on the flange of one of said eccentric weight units to engage said first stop means and limit the relative movement of said eccentric weight means to positions of balanced and additive eccentricity, and said automatic means including spring means in said chamber of the other eccentric weight unit of said second pair of matched eccentric weight units connecting said pairs of eccentric weight units to place them in their additive eccentric position when said shaft means is decelerated.
Claim 7
Dependent Claim
64 words
The eccentric weight structure of claim 5 which also includes an accelerator means for said shaft means to rotate said eccentric weight means in balanced relation to afore-selected critical speeds, and cutoff means for said accelerator means to permit said eccentric weight means to decelerate and impart periods of eccentric vibration through said base to the object to be vibrated when not being accelerated.
Claim 8
Dependent Claim
35 words
The eccentric weighT structure of claim 5 which also includes bushing means to secure said second pair of matched eccentric weight means to said shaft means, each of said eccentric weight units being matched duplicates.
Claim 9
Dependent Claim
43 words
The eccentric weight structure of claim 5 which also includes a cylindrical enclosure attached to the peripheries of said second pair of eccentric weight units and free of said first pair of eccentric weight units to enclose and seal said eccentric weight system.
Claim 10
Dependent Claim
149 words
A rotary eccentric vibrator comprising a base to be attached to a member to be vibrated, a rotary shaft means supported by frictionless bearing means from said base to be accelerated, a matched pair of eccentric weight means fixed to said shaft means in spaced relation to each other, a second matched pair of eccentric weight means secured to each other and supported by frictionless bearing means on said shaft means between said first pair of eccentric weight means, stop means effective between said first pair and said second pair of weight means to limit the relative rotary movement of the latter relative to the former to produce a balanced weight condition of said rotary shaft means, and spring means effective between said first pair and said second pair of weight means to urge said weight means into additive eccentric weight position when said rotary shaft is not accelerated.
Claim 11
Dependent Claim
149 words
A rotary eccentric vibrator comprising a base to be attached to a member to be vibrated, a rotary shaft means supported by frictionless bearing means from said base to be accelerated, a matched pair of eccentric weight means fixed to said shaft means in spaced relation to each other, a second matched pair of eccentric weight means secured to each other and supported by frictionless bearing means on said shaft means between said first pair of eccentric weight means, stop means effective between said first pair and said second pair of weight means to limit the relative rotary movement of the latter relative to the former to produce a balanced weight condition of said rotary shaft means, and spring means effective between said first pair and said second pair of weight means to urge said weight means into additive eccentric weight position when said rotary shaft is not accelerated.
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) | 1976-11-19 | 1977-05-21 | 1977-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-19 | 1981-05-21 | 1981-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-19 | 1985-05-21 | 1985-11-20 | $7700.00 | Window Closed / Lapsed |