Patent US4074792A successfully refreshed from Google Patents.
US4074792A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Portable hanging scaffold
Assignee: Individual
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Filing: 1977-05-11
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Granted: 1978-02-21
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Expires: 1997-05-11
Abstract
Abstract A strong lightweight hanging scaffold for four or more workmen with heavy materials has a wide range of adjustability adapting it for a variety of uses on many types of one and two story buildings including buildings with gable ends. The scaffold features strong top and bottom truss arms or beams which are vertically adjustable on end vertical ladder-type frames. A sturdy walkway of box form has a non-slip metal walking surface and may be employed in both level and inclined positions while resting on the bottom truss arms. Top spiked engaging bars of the upper truss arms have swiveled connections therewith so as to be compatible with various roof contours. The lower truss arms have extension bars with feet adapted for stable engagement with building walls.
Inventors
- 👤 Alonzo N. Zaugg
- 👤 Richard W. Ellis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:16
CPC Classifications
E; E04; E04G; E04G5/00; E04G5/04; E04G3/00; E04G3/22; E04G5/041; E04G5/06; E04G5/062
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
152 words
A hanging scaffold comprising a pair of end vertical frames each having a pair of vertical open ended tubular members, upper and lower pairs of horizontal support arms each having pairs of spaced vertical extension bars adapted for adjustable telescopic engagement within said tubular members, means to releasably lock the extension bars in selected adjusted positions within the tubular members to establish the overall vertical height of the scaffold, the upper pair of horizontal support arms being engageable with a building structure to suspend the scaffold thereon and lower pair of support arms adapted to engage a wall of a building structure, a walkway formed as a separate unit and adapted to rest bodily on said lower pair of support arms, and selectively engageable plural interlocking means on the walkway and pair of lower support arms enabling the walkway to be adjusted longitudinally and laterally on the pair of lower support arms.
Claim 2
Dependent Claim
152 words
A hanging scaffold comprising a pair of end vertical frames each having a pair of vertical open ended tubular members, upper and lower pairs of horizontal support arms each having pairs of spaced vertical extension bars adapted for adjustable telescopic engagement within said tubular members, means to releasably lock the extension bars in selected adjusted positions within the tubular members to establish the overall vertical height of the scaffold, the upper pair of horizontal support arms being engageable with a building structure to suspend the scaffold thereon and lower pair of support arms adapted to engage a wall of a building structure, a walkway formed as a separate unit and adapted to rest bodily on said lower pair of support arms, and selectively engageable plural interlocking means on the walkway and pair of lower support arms enabling the walkway to be adjusted longitudinally and laterally on the pair of lower support arms.
Claim 3
Dependent Claim
40 words
A hanging scaffold as defined in claim 1, and the support arms of said upper and lower pairs comprising trusses whose members are arranged in common vertical planes with said end vertical frames, said end vertical frames comprising ladder frames.
Claim 4
Dependent Claim
90 words
A hanging scaffold as defined in claim 1, and said walkway comprising a unitized box frame having upper and lower longitudinal frame members and cross braces interconnecting said frame members horizontally and vertically, a non-slip walking panel affixed to the top of said walkway, and said selectively engageable plural interlocking means comprising multiple spaced openings in the bottom faces of said lower frame members, and multiple spaced upstanding pins on said lower support arms adapted for selective entry into said openings for positioning the walkway in a chosen use position.
Claim 5
Dependent Claim
42 words
A hanging scaffold as defined in claim 1, and engaging bars on the forward ends of the upper pair of horizontal support arms and having swiveled connections with said support arms whereby said engaging bars can adjust themselves to varying roof contours.
Claim 6
Dependent Claim
33 words
A hanging scaffold as defined in claim 4, and depending spike elements on said engaging bars, said engaging bars extending transversely of the support arms of said upper pair on opposite sides thereof.
Claim 7
Dependent Claim
38 words
A hanging scaffold as defined in claim 1, and telescopically adjustable extension bars for said lower pair of horizontal support arms including wall engaging feet, and means to releasably lock said extension bars in selected horizontally adjusted positions.
Claim 8
Dependent Claim
55 words
A hanging scaffold as defined in claim 1, and at least one telescoping frame section for each of said vertical frames whereby the lengths of the vertical frames may be increased in the scaffold, each telescoping frame section having telescopic engagement with its associated vertical frame and its associated upper or lower horizontal support arm.
Claim 9
Dependent Claim
43 words
A hanging scaffold as defined in claim 2, and the vertical open-ended tubular members of said ladder frames being rectangular in cross section, and said vertical extension bars of the upper and lower pairs of horizontal support arms being of rectangular cross section.
Claim 10
Dependent Claim
37 words
A hanging scaffold as defined in claim 8, and said means to releasably lock the extension bars in selected adjusted positions comprising releasable pins engageable through spaced apertures of the extension bars and vertical open-ended tubular members.
Claim 11
Dependent Claim
56 words
A hanging scaffold as defined in claim 1, and the truss members of the upper pair of support arms being inclined and projecting above a horizontal member of each upper support arm, and the truss members of the lower pair of support arms being inclined and underslung relative to horizontal members of the lower support arms.
Claim 12
Dependent Claim
33 words
A hanging scaffold as defined in claim 4, and said upper pair of horizontal support arms including longitudinally extensible telescoping bars, and said engaging bars being swiveled to said longitudinally extensible telescoping bars.
Claim 13
Dependent Claim
36 words
A hanging scaffold as defined in claim 1, and said upper and lower pairs of horizontal support arms including longitudinally extensible telescoping bar members, and means to releasably lock said bar members in selected adjusted positions.
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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) | 1981-02-20 | 1981-08-22 | 1982-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-20 | 1985-08-22 | 1986-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-20 | 1989-08-22 | 1990-02-21 | $7700.00 | Window Closed / Lapsed |