Boots – shoes – and leggings – Antislipping devices – Calks
Patent
1979-11-21
1981-11-10
Lawson, Patrick D.
Boots, shoes, and leggings
Antislipping devices
Calks
A43C 1500
Patent
active
042990386
ABSTRACT:
A running or jogging shoe having an improved outer sole equipped with replaceable synthetic insert elements having a uniquely contoured shape adapted to be threadedly secured in overlapping relationship to raised projections on the sole exterior. In a first embodiment, the insert elements are adapted to receive and retain conventional spikes. In a second embodiment, the insert elements include integrally formed gripping projections. By replacing worn insert elements, the useful life of the outer sole, and thus the shoe as well, can be extended significantly.
REFERENCES:
patent: 2292238 (1942-08-01), Pierce et al.
patent: 3928881 (1975-12-01), Bente
BRS, Inc.
Lawson Patrick D.
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