Progressive timbering device

Details Progressive timbering device Progressive timbering device

1977-07-11

1978-08-22

Taylor, Dennis L.

E21D 1544

Patent

active

041079310

ABSTRACT:
A progressive timbering device for use in excavation and mines, comprises a ridge plate adapted to be positioned against the roof or face of the excavation, and a sill disposed beneath the ridge plate adapted to be positioned along the floor. A fluid-pressure operated pressing cylinder and piston combination is disposed between the sill and the ridge plate. Either the ridge plate or the sill, or both, are provided with an endless track guideway extending around the top and bottom and both ends of the associated part, with an endless track engaged in the trackway and projecting outwardly of the associated one of the sills and the ridge plates into engagement with the face of the excavation.

REFERENCES:
patent: 2826898 (1958-03-01), Joy
patent: 2899800 (1959-08-01), Joy

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