US3714737A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Operating mechanism for vertically sliding door
Assignee: HOPLAB Inc
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Filing: 1971-02-08
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Granted: 1973-02-06
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Expires: 1991-02-08
Abstract
Abstract The invention relates to operating mechanism for a vertically sliding door of a washing machine for laboratory equipment in which the door is raised to the open position by hydraulic pressure and is lowered to the closed position by gradually releasing the hydraulic pressure in such a way that during the downward run of the door the same is only under the influence of its own weight, so as to avoid accidental injury to the operator or damage to the equipment being washed.
Inventors
- 👤 P Fillion
- 👤 V Guay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:09
CPC Classifications
E; E05; E05F; E05F15/00; E05F15/50; E05F15/57; E05F1/00; E05F1/02; E05Y; E05Y2900/00; E05Y2900/10; E05Y2900/13; E05Y2900/132; E05Y2900/30; E05Y2900/312
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
151 words
Operating mechanism for a vertically sliding door comprising: at least one hydraulic cylinder vertically mounted under said door, a piston slidably mounted in said cylinder, a rod disposed between said piston and said door, a supply pipe and a drain pipe connected to said cylinder, a first valve located in said supply pipe for permitting fluid to enter the supply pipe when the first valve is opened so as to move said piston upwardly and raise the sliding door, a second valve located in said drain pipe for permitting said fluid to escape through the drain pipe under the pressure exerted by the sole weight of the door acting on said piston when it is desired to lower the sliding door, and a control valve having an adjustable orifice located in both said supplY and drain pipes so as to control the rate of opening and closure of the sliding door.
Claim 2
Dependent Claim
151 words
Operating mechanism for a vertically sliding door comprising: at least one hydraulic cylinder vertically mounted under said door, a piston slidably mounted in said cylinder, a rod disposed between said piston and said door, a supply pipe and a drain pipe connected to said cylinder, a first valve located in said supply pipe for permitting fluid to enter the supply pipe when the first valve is opened so as to move said piston upwardly and raise the sliding door, a second valve located in said drain pipe for permitting said fluid to escape through the drain pipe under the pressure exerted by the sole weight of the door acting on said piston when it is desired to lower the sliding door, and a control valve having an adjustable orifice located in both said supplY and drain pipes so as to control the rate of opening and closure of the sliding door.
Claim 3
Dependent Claim
151 words
Operating mechanism for a vertically sliding door comprising: at least one hydraulic cylinder vertically mounted under said door, a piston slidably mounted in said cylinder, a rod disposed between said piston and said door, a supply pipe and a drain pipe connected to said cylinder, a first valve located in said supply pipe for permitting fluid to enter the supply pipe when the first valve is opened so as to move said piston upwardly and raise the sliding door, a second valve located in said drain pipe for permitting said fluid to escape through the drain pipe under the pressure exerted by the sole weight of the door acting on said piston when it is desired to lower the sliding door, and a control valve having an adjustable orifice located in both said supplY and drain pipes so as to control the rate of opening and closure of the sliding door.
Claim 4
Dependent Claim
151 words
Operating mechanism for a vertically sliding door comprising: at least one hydraulic cylinder vertically mounted under said door, a piston slidably mounted in said cylinder, a rod disposed between said piston and said door, a supply pipe and a drain pipe connected to said cylinder, a first valve located in said supply pipe for permitting fluid to enter the supply pipe when the first valve is opened so as to move said piston upwardly and raise the sliding door, a second valve located in said drain pipe for permitting said fluid to escape through the drain pipe under the pressure exerted by the sole weight of the door acting on said piston when it is desired to lower the sliding door, and a control valve having an adjustable orifice located in both said supplY and drain pipes so as to control the rate of opening and closure of the sliding door.
Claim 5
Dependent Claim
58 words
Operating mechanism for a vertically sliding door according to claim 1, wherein each piston has a shallow socket on the upper face thereof, and said rod end rests in said socket whereby the door can be raised manually without carrying the piston with it for cleaning the rod or in the case of failure of the operating mechanism.
Claim 6
Dependent Claim
23 words
Operating mechanism for a vertically sliding door according to claim 2, wherein said socket is hemispherical, and said rod end is correspondingly rounded.
Claim 7
Dependent Claim
48 words
Operating mechanism for a vertically sliding door according to claim 1, wherein said rod is threaded at its upper end, said door has a corresponding bore opening on the bottom face thereof, said bore receiving said threaded rod end so as to permit longitudinal adjustment of said rod.
Claim 8
Dependent Claim
29 words
Operating mechanism for a vertically sliding door according to claim 4, wherein said threaded rod end has a nut mounted thereon locking against the bottom face of said door.
Claim 9
Dependent Claim
30 words
Operating mechanism for a vertically sliding door according to claim 1, wherein there are two such cylinders mounted at either side of said door, said two cylinders being hydraulically interconnected.
References Cited (Backward Citations)
US546854A
Cited
US2844967A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-06 | 1976-08-07 | 1977-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-06 | 1980-08-07 | 1981-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-06 | 1984-08-07 | 1985-02-06 | $7700.00 | Window Closed / Lapsed |