US 5,320,790 AGranted

Method for producing a durable tactile warning surface

OwnerMichael Loweinventor

Life of this patent

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Abstract

A patterned tool and method for producing a durable tactile warning surface for sidewalks and other walkways including pouring a concrete base, applying pigmented or colored hardener to the upper surface of the concrete base, stamping the upper surface of the concrete base with the patterned tool including a substantially flat member having a plurality of symmetrically disposed recesses of a predetermined diameter and depth formed on the lower surface thereof and a plurality of corresponding vent channels formed through the substantially flat member in communication with each corresponding recess and curing the concrete base to form a durable tactile warning surface including a plurality of symmetrically disposed raised elements of a predetermined diameter, height and spacing corresponding to the plurality of recesses to produce an uneven surface visually contrasting with adjacent surface areas.

Claims2

Dependent claims

A method for producing a tactile warning surface as a sidewalk, the tactile warning surface including a base having a plurality of raised elements formed on an upper surface of the base comprising the following steps in sequence:

(a) preparing a cementitious mortar,
(b) pouring the cementitious mortar into a form,
(c) leveling the cementitious mortar,
(d) applying a pigment to the cementitious mortar,
(e) applying a hardener to the cementitious mortar,
(f) applying a release agent to an upper surface of the cementitious mortar,
(g) impressing the upper surface of the cementitious mortar with a patterned tool comprising a substantially flat flexible member having a plurality of symmetrically disposed recesses of a predetermined diameter and depth formed on a lower surface of the member to form the plurality of raised elements of the tactile warning surface on the upper surface of the cementitious mortar and the patterned tool comprising a plurality of vent channels each in communication with one of the recesses and formed through the member to vent air therethrough during the impressing step,
(h) peeling the patterned tool from the upper surface of the cementitious mortar,
(i) allowing the cementitious mortar to cure thus forming the tactile warning surface including the base and the plurality of raised elements on the upper surface of the base, and
(j) sealing the cured upper surface of the base and thus the tactile warning surface with a sealer.

7 more elements

Dependencies are inferred from the claim text.

Facts

Application: 07/911,901Filed 10 Jul 1992
Granted: 14 Jun 1994
Term ends: Not estimatedThe source records don’t support an estimate.

Classification10 codes

C04B 41/70
Coating or impregnation: for obtaining at least two superposed coatings having different compositions
A61H 3/066
Walking aids for blind persons: installations on the floor, e.g. special surfaces, to guide blind persons
B28B 7/0008
Auxiliary parts or elements of the mould: venting channels, e.g. to avoid vacuum during demoulding or allowing air to escape during feeding,…
B28B 7/0064
Moulds; Cores; Mandrels: moulds characterised by special surfaces for producing a desired surface of a moulded article, e.g. profiled or polished…