E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
255/13
E21B 4/06 (2006.01) E21B 4/14 (2006.01) E21B 7/26 (2006.01)
Patent
CA 1162909
12 ABSTRACT There is provided an earth-piercing tool which includes an outer tubular housing with a forward and a rearward end. An elongate hammer member is slideably mounted within the outer housing for driving the latter either forwardly or rearwardly through impact. A rearwardly open tubular portion constitutes the rear part of the hammer member. A hollow shaft is threadably engaged with a portion fixed longitudinally with respect to the housing and supports a drum member which moves axially as the shaft is rotated, the drum member being snugly received in the open tubular portion of the hammer member. At least one opening is provided intermediate the tubular portion, and with this construction the axial position of the drum member will determine whether the hammer member drives the hammer forwardly or rearwardly. In order to provide finely adjustable positions for the drum member, and thus to maximize the impact effect of the hammer member within the housing, a first stop means is provided on the longitudinally fixed portion and on the shaft in order to establish a rearward limit position of the shaft and drum member with respect to the housing, while a second stop means is provided on the longitudinally fixed portion and on a nut member threadably engaging the shaft, this establishing a forward limit position of the shaft and drum member with respect to the housing. The nut member can be locked into position, and due to the fact that it is a threaded member, its position when it is locked can be minutely 13 adjusted, thus minutely adjusting the position of the drum member in its rearward position, thus maximizing the efficiency and effect of the tool.
400493
Banister Continental Ltd.
Sim & Mcburney
LandOfFree
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