Patent US3673592A successfully refreshed from Google Patents.
US3673592A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lockout for portable appliance with caster jack mechanism
Assignee: Whirlpool Corp
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Filing: 1970-08-21
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Granted: 1972-06-27
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Expires: 1990-08-21
Abstract
Abstract Portable appliance of the type in which a cabinet is supported on a frame having retractable caster wheels, the appliance being provided with a switch which is operable by movement of the wheels into a cabinet raising position, the switch functioning to prevent energization of the appliance when the cabinet is elevated, as well as to afford a signal.
Inventors
- 👤 William R Berry
- 👤 Reinhold A Drews
- 👤 Julius J Grau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:00
CPC Classifications
D; D06; D06F; D06F39/00; D06F39/12; D06F39/125
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
196 words
A lockout for a portable appliance having a caster jack mechanism and means energizable to perform an operating cycle of the appliance, comprising: a cabinet having a supporting base and a recessed cabinet portion; first and second shafts supported by said cabinet for rotative movement and drive means connecting said shafts for rotating said first shaft in response to rotation of said second shaft; actuating means connected to said second shaft including a lever mechanIsm connected to said second shaft and a foot pedal connected to said lever and disposed in said recessed portion for access by an operator; a plurality of caster wheels disposed in spaced relation along said first and second shafts, said caster wheels being pivotable into cabinet supporting relation upon rotation of said first and second shafts in one direction; switch means carried by one of said shafts and actuated by rotation in said one direction; and safety means operated by said switch means including means interposed between said energizable means and an electrical supply to prevent energization of said operating means upon actuation of said switch means so that the appliance may not be operated unless supported by said supporting base.
Claim 2
Dependent Claim
196 words
A lockout for a portable appliance having a caster jack mechanism and means energizable to perform an operating cycle of the appliance, comprising: a cabinet having a supporting base and a recessed cabinet portion; first and second shafts supported by said cabinet for rotative movement and drive means connecting said shafts for rotating said first shaft in response to rotation of said second shaft; actuating means connected to said second shaft including a lever mechanIsm connected to said second shaft and a foot pedal connected to said lever and disposed in said recessed portion for access by an operator; a plurality of caster wheels disposed in spaced relation along said first and second shafts, said caster wheels being pivotable into cabinet supporting relation upon rotation of said first and second shafts in one direction; switch means carried by one of said shafts and actuated by rotation in said one direction; and safety means operated by said switch means including means interposed between said energizable means and an electrical supply to prevent energization of said operating means upon actuation of said switch means so that the appliance may not be operated unless supported by said supporting base.
Claim 3
Dependent Claim
23 words
The lockout according to claim 1, wherein said safety means includes an audible signal means operated by the actuation of said switch means.
Claim 4
Dependent Claim
15 words
The lockout according to claim 1, wherein said switch means includes a position sensitive switch.
Claim 5
Dependent Claim
49 words
The lockout according to claim 1, wherein said switch means includes a position sensitive switch and said safety means includes a relay having a coil connected in circuit with said switch and the electrical supply and a set of contacts interposed between the electrical supply and said operating means.
Claim 6
Dependent Claim
21 words
The lockout according to claim 4, wherein said relay is a kickout relay which is normally mechanically operated upon excessive vibration.
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) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |