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US3733140A Expired / Lapsed US ⏱️ 0.0 years remaining

Curb forming machine

Assignee: Renner Co
•
Filing: 1971-12-20
•
Granted: 1973-05-15
•
Expires: 1991-12-20
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Abstract

Abstract A curb forming machine comprises a manually operable steerable device for forming asphaltic concrete or portland cement mixes having no slump characteristics into a uniform curb. The device carries a curb forming shoe with a hopper thereabove slidable in relation to the shoe and communicating therewith in one position and closed with respect thereto in another. A ram is attached to a wall of the hopper and is movable toward and away from the shoe. Movement of the ram and the hopper permits asphaltic or portland cement mix to fall by gravity into the shoe and the compaction of the same in the shoe when the ram moves toward the same. The reaction force moves the curb forming machine away from the newly extruded curbing.

Inventors

  • 👤 W James

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-30 20:10
CPC Classifications
E; E01; E01C; E01C19/00; E01C19/48; E01C19/4886; E01C19/4893

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 98 words
A curb forming machine consisting of an elongated curb forming shoe having an opening in the upper portion thereof, a hopper for receiving curbing material slidably mounted on said curb forming shoe and movable from a first position in communication with said opening in the said shoe to a second position away from said opening a ram disposed within said curb forming shoe and having a cross sectional configuration corresponding substantially thereto said ram attached to said hopper and movable therewith and means to operate said ram longitudinally within said shoe and said hopper longitudinally on said shoe.
Claim 2
Dependent Claim 98 words
A curb forming machine consisting of an elongated curb forming shoe having an opening in the upper portion thereof, a hopper for receiving curbing material slidably mounted on said curb forming shoe and movable from a first position in communication with said opening in the said shoe to a second position away from said opening a ram disposed within said curb forming shoe and having a cross sectional configuration corresponding substantially thereto said ram attached to said hopper and movable therewith and means to operate said ram longitudinally within said shoe and said hopper longitudinally on said shoe.
Claim 3
Dependent Claim 43 words
The curb forming machine set forth in claim 1 and wherein said means for operating said ram and said hopper consists of a lever, means on said shoe pivotally engaging said lever and a link connecting said lever and said ram and hopper.
Claim 4
Dependent Claim 37 words
A curb forming machine set forth in claim 1 and wherein one end of said shoe is curved outwardly so as form an area of gradual separation with respect to curbing shaped therein and moving relative thereto.
Claim 5
Dependent Claim 38 words
A curb forming machine set forth in claim 1 and wherein a pair of longitudinally extending spaced rails are positioned on said shoe one on either side of said opening therein and said hopper is slidably positioned therebetween.

References Cited (Backward Citations)

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US2541547A Cited
US2932875A Cited
US3053156A Cited
US3261272A Cited
US3280711A Cited
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GB1203436A Cited
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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) 1976-05-14 1976-11-13 1977-05-15 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1980-05-14 1980-11-13 1981-05-15 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1984-05-14 1984-11-13 1985-05-15 $7700.00 Window Closed / Lapsed

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