US3592094A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bandsaw work feed
Assignee: Individual
•
Filing: 1969-08-28
•
Granted: 1971-07-13
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Expires: 1989-08-28
Abstract
Abstract A variable-speed, constant-thrust, work feed for band and circular saws. It employs a DC motor generator in which motor speed and generator output voltage normally decrease as load increases, but it uses a control which increases motor voltage input as a function of generator voltage reduction to maintain substantially constant speed and power. The feeding speed may be adjusted and may be automatically regulated to limit the load on the saw blade to prevent injury to the blade, and to give warning to the operator. Means to increase the feeding rate temporarily is provided. Withdrawal is at higher speed. Limit switches control feed and withdrawal. Dynamic braking prevents overtravel in either direction when the mechanism is stopped intentionally or by limit switches. A feeding speed indicator is provided.
Inventors
- 👤 Louis W Greenblatt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:22
CPC Classifications
B; B23; B23D; B23D55/00; B23D55/04; B23D55/046; B23Q; B23Q11/00; B23Q11/04; B27; B27B; B27B25/00; B27B25/08; Y; Y10; Y10T; Y10T83/00; Y10T83/141; Y10T83/647; Y10T83/6584; Y10T83/707; Y10T83/7151
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
74 words
In a work feed for feeding work and a cutting tool together; a driving ram for moving the work and tool together for cutting of the work, driving means including a motor for operating the ram and for withdrawing it; and means in the driving means for adjusting the torque of the motor as the load changes to compensate for change of load and to maintain substantially constant speed of movement of the ram.
Claim 2
Dependent Claim
74 words
In a work feed for feeding work and a cutting tool together; a driving ram for moving the work and tool together for cutting of the work, driving means including a motor for operating the ram and for withdrawing it; and means in the driving means for adjusting the torque of the motor as the load changes to compensate for change of load and to maintain substantially constant speed of movement of the ram.
Claim 3
Dependent Claim
22 words
The work feed of claim 1, including means mounting the same on a worktable and means for adjusting it laterally and vertically.
Claim 4
Dependent Claim
66 words
The work feed of claim 1, including a rail upon which the work feed is mounted for sliding movement therealong; clamp means to receive the rail and secure it upon a worktable, interengaging means between the clamp means and the rail for displacing one relative to the other and adjust the height of the rail, and means to secure the rail tightly to the clamp means.
Claim 5
Dependent Claim
65 words
The work feed of claim 1 wherein the ram is a threaded shaft, and the driving means includes a housing and a motor, with a motor shaft, a wheel threaded onto the shaft and gearing between the motor and the wheel to rotate the wheel upon operation of the motor, and means in the housing to prevent rotation of the wheel threaded onto the shaft.
Claim 6
Dependent Claim
25 words
The work feed of claim 1, with means responsive to excess resistance of the work to being cut, to reduce the speed of the motor.
Claim 7
Dependent Claim
56 words
The work feed of claim 5, wherein the means responsive to excess resistance includes a resistingly yieldable device interposed between the motor and the work, yieldable with resistance of the work increases beyond a predetermined value, and means to reduce the speed and torque of the motor, operated by the yieldable device in its yielded position.
Claim 8
Dependent Claim
28 words
The work feed of claim 1, with means displaced in response to excess resistance of the work to being cut, and a sensible alarm operated by such displacement.
Claim 9
Dependent Claim
30 words
The work feed of claim 1 including means to short circuit the motor windings when the motor circuit is deenergized, to cause the motor to be retarded by dynamic braking.
Claim 10
Dependent Claim
45 words
The work feed of claim 1, including limit switch means to deenergize the motor circuit upon operation of the ram to an extreme, and means to short circuit the motor windings when the limit switch means is actuated, to achieve dynamic braking of the motor.
Claim 11
Dependent Claim
71 words
The work feed of claim 1, wherein the driving means includes a generator connected to be driven by the motor to produce a potential that varies with generator speed, and means applying the generator voltage in opposition to the energizing voltage applied to the motor, to reduce the net voltage applied to the motor as a function of increasing generator speed, and to maintain the speed of the motor substantially constant.
Claim 12
Dependent Claim
23 words
The work feed of claim 1 wherein the motor has means selectively operable at will for adjusting its speed to produce fast operation.
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) | 1974-07-12 | 1975-01-11 | 1975-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-12 | 1979-01-11 | 1979-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-12 | 1983-01-11 | 1983-07-13 | $7700.00 | Window Closed / Lapsed |