Title: Percussive air hammer and core bit apparatus

Abstract: An airhammer and core bit apparatus including a housing and a hammer piston reciprocable in the housing for delivering repeated impact blows to an anvil secured to or forming part of a core bit which produces a core in a bore hole being drilled. A central core receiving tube extends through the housing and hammer piston, through which the core formed by the bit is conducted upwardly and through the hammer piston to the top of the bore hole, part of the compressed air supplied to the airhammer being diverted to the central tube for elevating the core therewithin toward the top of the bore hole.

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Inventors: Curington, Alfred R. (Houston, TX, US)
Roscoe, Jr., Theodore J. (Houston, TX, US)

Application Number: 517540
Filing Date: 1974-10-24
Publication_date: 1976-03-02
Assignee: Bakerdrill, Inc. (Spartanburg, SC)
Primary Class(es): 175/100 173/78, 173/135, 175/60, 175/215
Other Classes:
US Patent Ref:

1862260	Jun, 1932	Edmunds	175/100.
3162251	Dec, 1964	Bassinger	175/92.
3191693	Jun, 1965	Lincoln	173/78.
3524511	Aug, 1970	Klemm	173/78.
3583501	Jun, 1971	Aalund	173/78.
3712388	Jan, 1973	Curington	173/78.
3735820	May, 1973	Curington	173/78.
3795283	Mar, 1974	Oughton	175/92.
3807514	Apr, 1974	Murrell	175/215.
3830319	Aug, 1974	van der Wijden	175/60.

Other Refs:
Primary Examiner: Brown, David H.
Assistant Examiner:
Attorney: Kriegel; Bernard