Crowd for kelly bar

Details Crowd for kelly bar Crowd for kelly bar

1976-11-18

1978-05-02

Staab, Lawrence J.

Tool driving or impacting

Advance causing or controlling means

Tool advances relative to drive

279 4, B23Q 500

Patent

active

040869695

ABSTRACT:
In a heavy duty drilling machine having a boring head for rotating a kelly bar, a crowd frame supported above the boring head by hydraulic rams, a crowd supported in the crowd frame and means supported by the crowd frame to engage the crowd with the kelly bar to transfer the entire weight of the drilling machine and crowd frame on to the kelly bar to increase the down pressure on drilling means at the lower end of the kelly bar; the kelly bar being disengageable during operation to permit drilling without use of the crowd. There is also provided a stabilizer to prevent twisting of the crowd frame during rotation of the kelly bar when the crowd is engaged.

REFERENCES:
patent: 2090854 (1937-08-01), Timbs
patent: 2188107 (1940-01-01), Caldwell et al.
patent: 2570308 (1951-10-01), Beeth
patent: 2586784 (1952-02-01), Capp et al.
patent: 2730331 (1956-01-01), Harinck
patent: 3094312 (1963-06-01), Woolgar
patent: 3212591 (1965-10-01), Tucker
patent: 3792869 (1974-02-01), Braun

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