Patent US3707930A successfully refreshed from Google Patents.
US3707930A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power operated pedestal table and safety clutch therefor
Assignee: HAMILTON INDUSTRIES Inc
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Filing: 1971-07-26
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Granted: 1973-01-02
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Expires: 1991-07-26
Abstract
Abstract A power-operated pedestal table having an extendable column for selectively varying the elevation of the table top. The column includes a pair of telescoping sections which are expanded and contracted by a power driven screw shaft. A one-way safety clutch automatically disengages the upper section from further downward movement under power when such downward movement is restrained by an obstruction such as, for example, an item of furniture or the operator himself.
Inventors
- 👤 L Yindra
- 👤 J Klug
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:57
CPC Classifications
A; A47; A47B; A47B27/00; A47B27/14; A47B13/00; A47B13/02; A47B13/023; A47B9/00; A47B9/04; A47B2200/00; A47B2200/0035; A47B2200/005; A47B2200/0056; A47B2200/0059; Y; Y10; Y10T; Y10T74/00; Y10T74/18; Y10T74/18568; Y10T74/18576; Y10T74/18696
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
173 words
A power-operated pedestal table comprising a base adapted to rest upon a floor surface, a table top, and a vertical column extending between the top and the base, said column being hollow and including upper and lower telescoping sections, a motor mounted in one of said sections and equipped with a vertical screw shaft extending into the other of said sections, and a safety clutch assembly mounted in said other of said sections, said assembly including a horizontal plate secured to said other section and having an opening through which said screw shaft extends, and a nut threadedly carried by said shaft and disposed on one side of said plate facing said one section, said plate providing a recess on said one side thereof for receiving said nut and restraining rotation of the nut when said shaft is rotated by said motor, said nut being withdrawn from said recess by continued rotation of said shaft in a direction for lowering said top when downward movement of said top is blocked by an obstacle.
Claim 2
Dependent Claim
173 words
A power-operated pedestal table comprising a base adapted to rest upon a floor surface, a table top, and a vertical column extending between the top and the base, said column being hollow and including upper and lower telescoping sections, a motor mounted in one of said sections and equipped with a vertical screw shaft extending into the other of said sections, and a safety clutch assembly mounted in said other of said sections, said assembly including a horizontal plate secured to said other section and having an opening through which said screw shaft extends, and a nut threadedly carried by said shaft and disposed on one side of said plate facing said one section, said plate providing a recess on said one side thereof for receiving said nut and restraining rotation of the nut when said shaft is rotated by said motor, said nut being withdrawn from said recess by continued rotation of said shaft in a direction for lowering said top when downward movement of said top is blocked by an obstacle.
Claim 3
Dependent Claim
17 words
The structure of claim 1 in which means are provided for urging said nut towards said recess.
Claim 4
Dependent Claim
70 words
The structure of claim 2 in which said means includes a bracket fixed relative to said plate and facing said recess, and a compression spring of preselected compressive force disposed between said bracket and said nut for urging said nut towards said recess, whereby, release of said safety clutch requires a restraining force upon said table top exceeding the compressive force of said spring and the weight of said top.
Claim 5
Dependent Claim
22 words
The structure of claim 3 in which said means also includes an anti-friction thrust bearing interposed between said spring and said nut.
Claim 6
Dependent Claim
50 words
The structure of claim 1 in which said opening in said horizontal plate is substantially larger than said shaft, a guide sleeve secured to said nut and projecting into said recess and through the opening in said plate for guiding movement of said nut into and out of said recess.
Claim 7
Dependent Claim
16 words
The structure of claim 1 in which said nut is formed of a rigid plastic material.
Claim 8
Dependent Claim
19 words
The structure of claim 5 in which said nut and sleeve are integrally formed of a rigid plastic material.
Claim 9
Dependent Claim
158 words
A power-operated pedestal table comprising a base adapted to rest upon a floor surface, a table top, and a vertical column extending between the top and the base, said column being hollow and including upper and lower telescoping sections, a motor mounted in said lower section and equipped with a screw shaft extending upwardly into said upper section, and a safety clutch assembly mounted in said upper section, said assembly including a horizontal plate secured to said upper section and having an opening through which said screw shaft extends, and a nut threadedly carried by said shaft beneath said plate, said plate providing a non-circular recess on its underside receiving said nut and normally restraining rotation of the same when said shaft is rotated by said motor, said nut being withdrawn from said recess by continued rotation of said shaft in a direction for lowering said top when downward movement of said top is blocked by an obstruction.
Claim 10
Dependent Claim
158 words
A power-operated pedestal table comprising a base adapted to rest upon a floor surface, a table top, and a vertical column extending between the top and the base, said column being hollow and including upper and lower telescoping sections, a motor mounted in said lower section and equipped with a screw shaft extending upwardly into said upper section, and a safety clutch assembly mounted in said upper section, said assembly including a horizontal plate secured to said upper section and having an opening through which said screw shaft extends, and a nut threadedly carried by said shaft beneath said plate, said plate providing a non-circular recess on its underside receiving said nut and normally restraining rotation of the same when said shaft is rotated by said motor, said nut being withdrawn from said recess by continued rotation of said shaft in a direction for lowering said top when downward movement of said top is blocked by an obstruction.
Claim 11
Dependent Claim
17 words
The structure of claim 8 in which means are provided for urging said nut towards said recess.
Claim 12
Dependent Claim
70 words
The structure of claim 8 in which said means includes a bracket fixed relative to said plate and disposed therebeneath, and a compression spring of preselected compressive force disposed between said bracket and said nut for urging said nut upwardly towards said recess, whereby, release of said safety clutch requires a restraining force upon said table top exceeding the compressive force of said spring and the weight of said top.
Claim 13
Dependent Claim
22 words
The structure of claim 10 in which said means also includes an anti-friction thrust bearing disposed between said spring and said nut.
Claim 14
Dependent Claim
60 words
The structure of claim 8 in which said nut and said recess are of generally rectangular horizontal cross sectional configuration, and a guide sleeve extending upwardly from said nut and through the opening in said horizontal plate, said guide sleeve having vertical dimensions greater than the depth of said recess for guiding said nut into and out of said recess.
Claim 15
Dependent Claim
16 words
The structure of claim 12 in which said guide sleeve and said nut are formed integrally.
Claim 16
Dependent Claim
19 words
The structure of claim 13 in which said nut and guide sleeve are formed integrally of rigid plastic material.
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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) | 1976-01-02 | 1976-07-03 | 1977-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-02 | 1980-07-03 | 1981-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-02 | 1984-07-03 | 1985-01-02 | $7700.00 | Window Closed / Lapsed |