# US 5,702,120 A · Rollable child carrier structure > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,702,120 A - Document ID: US5702120A - Status: Granted - Kind: A - Application number: 08/501,505 - Filed: 1995-08-09 - Granted: 1997-12-30 - Earliest claimed: 1995-08-09 - Assignees: Piccolino, LLC - Inventors: Adam G. Malofsky; Bernard M. Malofsky; Paul R. Glassberg - Web page: https://patentgrep.com/patent/US5702120A ## CPC - B62B 7/00: Carriages for children; Perambulators, e.g. dolls' perambulators - B62B 2501/065: Plastics - B62B: HAND-PROPELLED VEHICLES, e.g. HAND CARTS OR PERAMBULATORS; SLEDGES (characterised by animal propulsion B62C; propulsion of sledges by driver or engine B62M) ## Abstract A rollable child carrier structure comprising a rollable base and a multi-side enclosing frame, wherein said frame comprises tubing sections made of lightweight, high modulus fiber-reinforced plastic matrix composite tubing having a weight of 0.35 pounds or less per lineal foot, and wherein said plastic matrix is a thermoplastic resin or thermoset plastic resin with a minimum modulus of 250,000 psi; a minimum tensile strength of 6,000 psi; and a glass transition temperature of at least 50.degree. C. and wherein said high modulus fiber reinforcement is selected from the group consisting of carbon fibers, aramid fibers, glass fibers, polyolefin fibers, boron fibers, and mixtures thereof. ## Claims ### Claim 1 A rollable child carrier structure comprising a rollable base and a multi-side enclosing frame, wherein said frame comprises tubing sections made of lightweight, high modulus fiber-reinforced plastic matrix composite tubing having a weight of 0.35 pounds or less per lineal foot, a tubing diameter of 0.2 to 1.5 inches, a tubing thickness of 0.03 to 0.15 inches, a single fiber angle of 20.degree. to 50.degree., and fabricated from a single tow or at least one sheet of fibers and wherein said plastic matrix is a thermoplastic resin or thermoset plastic resin with a minimum modulus of 250,000 psi; a minimum tensile strength of 6,000 psi; and a glass transition temperature of at least 50.degree. C. and wherein said high modulus fiber reinforcement is selected from the group consisting of carbon fibers, aramid fibers, glass fibers, polyolefin fibers, boron fibers, and mixtures thereof. ### Claim 2 (depends on 1) The structure of claim 1 wherein said plastic matrix is an epoxy thermoset plastic. ### Claim 3 (depends on 1) The structure of claim 1 wherein said plastic matrix is a nylon thermoplastic resin with a minimum modulus of 325,000 psi and a minimum tensile strength of 10,000 and a thermoplastic resin T.sub.g of at least 75.degree. C. ### Claim 4 (depends on 1) The structure of claim 1 wherein ratio of high modulus fibers to plastic matrix is from 70:30 to 30:70 by volume. ### Claim 5 (depends on 1) The structure of claim 1 wherein said composite tubing is constructed by filament winding. ### Claim 6 (depends on 1) The structure of claim 1 wherein said composite tube is constructed by a pultrusion process. ### Claim 7 (depends on 1) The structure of claim 1 wherein the high modulus fibers are carbon fibers. ### Claim 8 (depends on 1) A rollable child carrier made of the composite tubings of claim 1 and connective fittings, supports, and folding mechanisms consisting of molded plastics containing lightening fillers, whose density is no more than 0.9 grams per cubic centimeter. ### Claim 9 (depends on 1) The structure of claim 1 wherein said composite tubing has a weight of 0.17 pounds or less per lineal foot, a tubing diameter from 0.2 to about 0.9 inches, a tubing wall thickness of 0.04 to 0.09 inches and a single fiber angle of 25.degree. to 45. ### Claim 10 (depends on 1) The structure of claim 1 wherein said composite tubing has a weight of 0.10 pounds or less per lineal foot, a tubing diameter from about 0.4 to about 0.8 inches, a tubing wall thickness of about 0.05 to 0.07 inches, and a single fiber angle of 30.degree. to 40.degree.. ### Claim 11 A rollable child carrier structure comprising a rollable base and a multi-side enclosing frame, wherein said frame comprises tubing sections made of lightweight, high modulus fiber-reinforced plastic matrix composite tubing having a weight of 0.35 pounds or less per lineal foot, and wherein said plastic matrix is a thermoplastic resin or thermoset plastic resin with a minimum modulus of 250,000 psi; a minimum tensile strength of 6,000 psi; and a glass transition temperature of at least 50.degree. C. and wherein said high modulus fiber reinforcement is selected from the group consisting of carbon fibers, aramid fibers, glass fibers, polyolefin fibers, boron fibers, and mixtures thereof. ### Claim 12 (depends on 11) The structure of claim 11 wherein said plastic matrix is an epoxy thermoset plastic. ### Claim 13 (depends on 11) The structure of claim 11 wherein said plastic matrix is a nylon thermoplastic resin with a minimum modulus of 325,000 psi and a minimum tensile strength of 10,000 and a thermoplastic resin T.sub.g of at least 75.degree. C. ### Claim 14 (depends on 11) The structure of claim 11 wherein ratio of high modulus fibers to plastic matrix is from 70:30 to 30:70 by volume. ### Claim 15 (depends on 11) The structure of claim 11 wherein said composite tubing is constructed by filament winding. ### Claim 16 (depends on 11) The structure of claim 11 wherein said composite tube is constructed by a pultrusion process. ### Claim 17 (depends on 11) The structure of claim 11 wherein the high modulus fibers are carbon fibers. ### Claim 18 (depends on 11) A rollable child carrier made of the composite tubing sections of claim 11 and connective fittings, supports, and folding mechanisms consisting of molded plastics containing lightening fillers, whose density is no more than 0.9 grams per cubic centimeter.