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Process for retreading solid tires

a technology for retreading solid tires and tires, applied in the direction of non-skid devices, transportation and packaging, other domestic objects, etc., can solve the problems of prone to slippage when pressing the rim back on the rim, the surface changes shape and hardness, and the effect of retreading solid tires

Inactive Publication Date: 2005-06-16
NOWOTARSKI BRYAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are several challenges to economically and effectively retreading solid tires.
These include: “Spin-on-the-rim”: When a tire body is exposed to heat and pressure during the curing operation, the bead surface changes shape and hardness such that the retread tire is prone to slip when press-fit back on the rim.
It does not, however, teach or suggest any means to minimize spin-on-the-rim.
Appearance and dimensional accuracy: Solid tires often suffer deep gouges in their sidewalls due to exposure to sharp objects in service, such as when the tires are used on forklifts in scrap metal yards.
This causes problems in obtaining a dimensionally accurate and cosmetically acceptable final product due to variability in the amount of rubber applied.
This variability has heretofore made it impractical to use a single C mold to retread solid tires from various manufacturers and with various sidewall designs.

Method used

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  • Process for retreading solid tires
  • Process for retreading solid tires
  • Process for retreading solid tires

Examples

Experimental program
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Effect test

example 1

Tire with Lugs

[0061] A worn, friction based, solid tire for use on a drive wheel of a forklift in service in a scrap metal yard was retread by the present process. The size of the tire was 7.00-12, where 7.00 refers to the width of the tire in inches and 12 refers to the to ID of the tire in inches. The tire was pressed off of the rim and buffed to a desired profile with a rough surface. Gouges in the sidewall were buffed and filled with an excess amount of uncured rubber. The buffed tire was sprayed with a water-based glue. Sheets of uncured tread stock rubber were wrapped around the tread surface of the tire in an amount such that the total amount of rubber was slightly more than the desired final amount of rubber in the cured tire. About 20 pounds of uncured rubber was added. The sheets of rubber were pressed onto the buffed tire using a stitcher in order to minimize entrained air and to get a good initial contact between the rubber sheets and the tread surface. This formed a gr...

example 2

Small Tire for Baggage Carts

[0066] A worn solid tire for use on an undriven but braked wheel of an airport baggage cart was retread by the present process. The size of the tire was 4.00-8. The tire was pressed off of the rim and buffed to a desired profile. Gouges in the sidewall were buffed and filled with an excess amount of uncured rubber. Sheets of uncured tread rubber were wrapped around the tread surface of the tire in an amount such that the total amount of rubber was slightly more than the desired final amount of rubber in the cured tire. About 3 pounds of uncured rubber was applied. The sheets of rubber were pressed onto the buffed tire using a stitcher in order to minimize entrained air and to get a good initial contact between the rubber sheets and the tread surface. This formed a green assembly.

[0067] The green assembly was preheated to 200° F. in an electrically heated chamber.

[0068] The green assembly was then placed in a C mold that comprised two halves, each half ...

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Abstract

A method for retreading a solid tire comprises: wrapping uncured rubber around the periphery of said tire to form a green assembly; clamping said green assembly in a C mold, said C mold comprising spindles, said spindles having a gap there between; and curing said tire assembly.

Description

CROSS-REFERENCE TO RELATED APPLICATION [0001] This application is a divisional and claims the benefit of the filing date of U.S. nonprovisional application entitled, “Process for Retreading Solid Tires”, U.S. Ser. No. 10 / 387,741, filed Mar. 13, 2003, which in turn claims the benefit of the filing date of U.S. provisional application entitled, “Process for Retreading Solid Tires”, U.S. Ser. No. 60 / 367,030, filed Mar. 22, 2002. Said nonprovisional and said provisional are both incorporated herein by reference.FIELD OF INVENTION [0002] The invention relates to a method and apparatus for retreading solid tires. BACKGROUND [0003] Solid tires are often used in severe services where exposure to sharp objects would puncture pneumatic tires. These services include ground support vehicles at airports, forklifts, pay-loaders, scrap metal yard vehicles, and skid steel loaders. [0004] Solid tires are often press-fit onto rims such that there is no slippage between the rims and tires during servi...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B29D30/54
CPCB29D30/54Y10T152/10306B29L2030/006B29D2030/547
Inventor NOWOTARSKI, BRYAN
Owner NOWOTARSKI BRYAN