US3600536A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Calibrating pressure switches at extra low-pressure setting
Assignee: Eaton Corp
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Filing: 1969-12-22
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Granted: 1971-08-17
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Expires: 1989-12-22
Abstract
Abstract The force or degree of compression of the spring is adjusted by rocking the lever about its axis A-B by means of the manually operated cam acting on the lever at D. Calibration for the lowto-high range is effected by adjusting the screw at B to rock the lever about axis A-D. For ''''extra low'''' settings, the cam is turned so the tab at D can, in effect be unlimited on its rise and the calibration is then effected by adjusting the limit screw acting on tab E. Any tool forces applied to either adjusting screw during calibration cannot be transmitted to the spring to adversely effect calibration.
Inventors
- 👤 Erich Kothe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 00:43
CPC Classifications
H; H01; H01H; H01H35/00; H01H35/24; H01H35/26; H01H35/2607
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
141 words
In a pressure switch of the type having a plunger arrangement for adjusting the effective spring force of the pressure switch and, hence, pressure to which it responds, a bracket, lever means mounted on the bracket and acting on the plunger to adjust the pressure switch, actuating means acting on the lever means in opposition to the spring force of the pressure switch over a high-to-low range of settings and movable to an ''''extra low'''' position in which it is ineffective to limit the movement of the lever means in a direction reducing the force of the pressure switch spring, positive limit means operative to engage and limit the lever means when the actuating means is ineffective, said limit means including means for adjusting and calibrating the point of limitation whereby the pressure switch can be calibrated for extra low response.
Claim 2
Dependent Claim
141 words
In a pressure switch of the type having a plunger arrangement for adjusting the effective spring force of the pressure switch and, hence, pressure to which it responds, a bracket, lever means mounted on the bracket and acting on the plunger to adjust the pressure switch, actuating means acting on the lever means in opposition to the spring force of the pressure switch over a high-to-low range of settings and movable to an ''''extra low'''' position in which it is ineffective to limit the movement of the lever means in a direction reducing the force of the pressure switch spring, positive limit means operative to engage and limit the lever means when the actuating means is ineffective, said limit means including means for adjusting and calibrating the point of limitation whereby the pressure switch can be calibrated for extra low response.
Claim 3
Dependent Claim
42 words
Pressure switch according to claim 1 in which the adjusting means is a cam acting on the lever means and includes a portion allowing a substantial movement of the lever means at ''''extra low'''' position subject to restraint by the calibrating means.
Claim 4
Dependent Claim
69 words
Pressure switch means according to claim 2 in which the cam is formed on a segment which rotates about an axis and the segment includes another portion, a second lever acting on said another portion frictionally engaged by said lever means, said another portion being shaped to actuate the second lever at said ''''extra low'''' position, and a switch actuated by said second lever at said ''''extra low'''' position.
Claim 5
Dependent Claim
40 words
Pressure switch means according to claim 2 in which the calibrating means is a screw threaded through the bracket in position to contact the lever means at said ''''extra low'''' position to accurately calibrate the pressure switch at ''''extra low.''''
Claim 6
Dependent Claim
28 words
Pressure switch means according to claim 4 including means to calibrate the position of the lever means over the high-to-low range without affecting the calibration at ''''extra low.''''
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) | 1974-08-16 | 1975-02-15 | 1975-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-16 | 1979-02-15 | 1979-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-16 | 1983-02-15 | 1983-08-17 | $7700.00 | Window Closed / Lapsed |