US3636671A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Access door assembly
Assignee: Individual
•
Filing: 1970-07-06
•
Granted: 1972-01-25
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Expires: 1990-07-06
Abstract
Abstract An access door assembly comprising a frame with an inwardly extending flange, a removable access door and clamping devices that are adjustable and so adapted that they can be adjusted to attach the access door assembly to bar members already randomly provided within the ceiling or wall structure at variable distances from the opening whereby a flush and tight clamping engagement will be made of the access door assembly against the exterior surfaces of the ceiling or wall within the opening of which the access door is being secured. The clamp devices are fixed at the corners of the door assembly and removed somewhat from the access door opening area and so that there is little interference therefrom.
Inventors
- 👤 Harry W Hollister
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:53
CPC Classifications
E; E06; E06B; E06B5/00; E06B5/01; E04; E04B; E04B9/00; E04B9/003
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
139 words
In an access door assembly adapted to be applied within a ceiling or wall opening comprising a door frame having a laterally extending flange and an inwardly extending flange, said frame being generally of square shape and said inwardly extending flange providing access opening, closure means releasably secured to the frame within the opening provided thereby, and clamping deVices pivotally secured to the inwardly extending flange of the frame adjacent to the respective corners thereof and said clamping devices having adjustable members adapted to engage with and be secured to fixed members lying within the ceiling structure or wall, and said clamping devices being adjustable longitudinally to clamp and pull the access door into the opening within the ceiling or wall with its frame flange engaging with the outer surface of the ceiling and wall in clamped relationship therewith.
Claim 2
Dependent Claim
139 words
In an access door assembly adapted to be applied within a ceiling or wall opening comprising a door frame having a laterally extending flange and an inwardly extending flange, said frame being generally of square shape and said inwardly extending flange providing access opening, closure means releasably secured to the frame within the opening provided thereby, and clamping deVices pivotally secured to the inwardly extending flange of the frame adjacent to the respective corners thereof and said clamping devices having adjustable members adapted to engage with and be secured to fixed members lying within the ceiling structure or wall, and said clamping devices being adjustable longitudinally to clamp and pull the access door into the opening within the ceiling or wall with its frame flange engaging with the outer surface of the ceiling and wall in clamped relationship therewith.
Claim 3
Dependent Claim
120 words
In an access door assembly as defined in claim 1, and each of said clamping devices comprising a threaded member having threads extended therealong and a flattened end portion, means for pivotally securing the threaded member by its flattened end portion to the flange of the frame, thumb nuts threadable along the threaded member, bar strips having holes receiving the threaded members of two of the clamping devices and adapted to engage opposite sides of bar members lying within the ceiling or wall structure and said thumb nuts being adjustable upon the threaded member and engaging respectively with the opposite sides of the bar strips to hold the bar strips in clamping relationship with the bars lying within the ceiling.
Claim 4
Dependent Claim
125 words
In an access door assembly as defined in claim 1, and each of said clamping devices comprising a threaded member having a flattened portion, bolt and nut means for securing the flattened portions to the frame flange, a turnbuckle threadingly engaging said threaded member, a further threaded member secured to the opposite ends of the turnbuckle and having an enlarged eye frame, an attaching bar extending through the enlarged eye member of opposing clamping devices on opposite sides of the frame assembly and adapted to bear against bar members lying within the ceiling or wall structure to which the access door assembly is being attached, said turnbuckles being adjustable to effect the clamping engagement of the access door frame with the ceiling or wall exterior.
Claim 5
Dependent Claim
100 words
In an access door assembly as defined in claim 1, and each of said clamping devices comprising a threaded member having a flattened end and bolt and nut means for pivotally connecting the flattened end of the threaded member to the inwardly extending flange of the frame assembly, a sleeve member adjustable upon the threaded shank and having a laterally extending bar engaging an arm adapted to lie against one surface of a bar member within the ceiling or wall and a thumb nut adjustable upon the threaded member to fix the sleeve and its arm against the bar member.
Claim 6
Dependent Claim
111 words
In an access door assembly as defined in claim 1, and each of the clamping devices comprising an L-shaped member, bolt and nut means for pivotally securing one leg of the L-shaped member to the inwardly extending flange, said L-shaped member having a short laterally extending leg and an elongated slot extending therein, a bolt having a head engageable with the interior of a wall and extending through the elongated slot of the laterally extending arm of the L-shaped member and opposing clamp nuts upon the bolt and engaging the opposite faces of the laterally extending arm to hold the bolt in place in engagement with interior surface within the wall.
Claim 7
Dependent Claim
114 words
In an access door assembly as defined in claim 5, and said L-shaped member having an elongated slot and said bolt means for securing the L-shaped member to the flange extending through the elongated slot to adjustably retain the L-shaped member upon the flange, and the slot of the laterally extending arm of the L-shaped member continuing downwardly into the long leg of the L-shaped member, and angle-shaped clamp member opposing the laterally extending leg of the L-shaped member and having a slot extending throughout the corner thereof and clamp bolt means securing said angle-shaped member to the long leg of the L-shaped member to fix the parts to a bar within the wall.
Claim 8
Dependent Claim
99 words
An access door assembly as defined in claim 1, and each of said clamping devicEs comprising a connecting member, bolt and nut means for pivotally securing the connecting member to the inwardly extending flange of the access frame, the outer ends of said connecting member having an elongated slot, two angle-shaped members having elongated slots adapted to engage the opposite sides of a bar member within the wall or ceiling structure and clamping means extending through the slots of said members for securing the angle-shaped and connecting members together and in engagement with the bar within the wall structure.
Claim 9
Dependent Claim
86 words
In an access door assembly as defined in claim 1, and said closure means comprising a closure plate, wedge-shaped spring devices connected to the opposite corners of the plate and extending inwardly from the inner face thereof, and said inwardly extending flange of the frame member having wedge spring-receiving devices for effecting the fastening of the closure plate over the opening of the access frame and pull means connected to the closure plate to facilitate the removal of the closure plate from the access door frame.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-24 | 1975-07-26 | 1976-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-24 | 1979-07-26 | 1980-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-24 | 1983-07-26 | 1984-01-25 | $7700.00 | Window Closed / Lapsed |