Patent US3791754A successfully refreshed from Google Patents.
US3791754A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Trowelling machine
Assignee: Individual
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Filing: 1972-01-10
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Granted: 1974-02-12
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Expires: 1992-01-10
Abstract
Abstract A trowelling machine, for finishing cementitious surfaces, of the type having a central hub rotatable by an engine mounted above the hub, the hub having radial carriers which support trowelling blades. In accordance with the invention the outer ends of the trowelling blade carriers are supported by a blade support assembly including a cast steel support member which member is specially designed to resist upwards deflection of the outer ends of the blade carriers.
Inventors
- 👤 F Zochil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:32
CPC Classifications
E; E04; E04F; E04F21/00; E04F21/20; E04F21/24; E04F21/245; E04F21/248
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
179 words
A trowelling machine of the type having a trowelling assembly rotatable by a power unit, the trowelling assembly comprising central hub means and a plurality of elongaTed trowelling blade carriers extending radially from the hub means, said carriers being supported at both their inner and their outer ends by shaft means allowing pivotal movement of the carriers about their radially extending axes, attaching means for attaching trowelling blades to said carriers, said shaft means associated with the outer ends of the carriers being disposed outside of all the said attaching means and being supported by a rotatable support member mounted at its centre on said hub means, said support member being of unitary construction and including circumferentially spaced parts each disposed above one of said carriers and with the material thereof being so distributed that the stiffness in vertical bending of one of said parts of the member transverse to a carrier axis and near to the hub means is greater than the stiffness in vertical bending of said one part near to the outer end of said carrier.
Claim 2
Dependent Claim
179 words
A trowelling machine of the type having a trowelling assembly rotatable by a power unit, the trowelling assembly comprising central hub means and a plurality of elongaTed trowelling blade carriers extending radially from the hub means, said carriers being supported at both their inner and their outer ends by shaft means allowing pivotal movement of the carriers about their radially extending axes, attaching means for attaching trowelling blades to said carriers, said shaft means associated with the outer ends of the carriers being disposed outside of all the said attaching means and being supported by a rotatable support member mounted at its centre on said hub means, said support member being of unitary construction and including circumferentially spaced parts each disposed above one of said carriers and with the material thereof being so distributed that the stiffness in vertical bending of one of said parts of the member transverse to a carrier axis and near to the hub means is greater than the stiffness in vertical bending of said one part near to the outer end of said carrier.
Claim 3
Dependent Claim
35 words
A trowelling machine according to claim 1, wherein said circumferentially spaced parts include radial arms spaced around the central hub means, the cross-sectional area of which arms decrease with increasing distance from the hub means.
Claim 4
Dependent Claim
52 words
A trowelling machine according to claim 1, wherein said circumferentially spaced parts are lobes spaced around the central hub means, said lobes extending above said blade carriers and the ends of said lobes being associated with bearings for the outer ends of the carriers, said lobes each having a weight reducing aperture.
Claim 5
Dependent Claim
86 words
A trowelling machine according to claim 3, wherein said rotatable support member is formed as a casting, and wherein said lobes are defined partially by two adjacent radial arms extending from a central area associated with the hub and partially by two members branching from the ends of said adjacent arms, the cross-sectional area of the two arms, taken transversely to the axis of a carrier, being larger than the cross-sectional area of the said two members also taken transversely to the axis of the carrier.
Claim 6
Dependent Claim
15 words
A trowelling machine according to claim 4, wherein said arms are of channel-shaped cross section.
Claim 7
Dependent Claim
15 words
A trowelling machine according to claim 4, wherein said members are of channel-shaped cross section.
Claim 8
Dependent Claim
13 words
A trowelling machine according to claim 4, wherein said casting is of aluminum.
Claim 9
Dependent Claim
16 words
A trowelling machine according to claim 1, wherein said rotatable support member is an aluminum casting.
Claim 10
Dependent Claim
30 words
A trowelling machine according to claim 1, wherein said support member carries bearing which completely surround the ends of the shaft means associated with the outer ends of the carriers.
Claim 11
Dependent Claim
13 words
A trowelling machine according to claim 9, wherein said bearings are roller bearings.
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) | 1977-02-11 | 1977-08-13 | 1978-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-11 | 1981-08-13 | 1982-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-11 | 1985-08-13 | 1986-02-12 | $7700.00 | Window Closed / Lapsed |