Boring or penetrating the earth – Boring without earth removal
Patent
1993-06-17
1994-08-16
Dang, Hoang C.
Boring or penetrating the earth
Boring without earth removal
173 91, 173126, 175296, E21B 414
Patent
active
053378377
ABSTRACT:
The weight of a pneumatic ground piercing tool of the type having a stepped air inlet is reduced and tool power increased by providing the tool body with a dual diameter. The tubular tool body has a front section and a rear section which has a greater inner and outer diameter than the front section, thereby reducing overall tool weight. In a preferred embodiment, the rear end portion of the striker likewise has a greater outer diameter than the front end portion thereof. The bearing of the front end portion of the striker remains in sliding contact with the interior of the front body section during tool operation, and the bearing of the rear end portion of the striker likewise remains in sliding contact with the interior of the rear body section. In this manner, the power of the tool is enhanced because the tool has less weight and the air distributing mechanism, located in the rear body section, is the same size as in a conventional tool wherein the entire body has a uniform diameter.
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Brochure entitled: Pierce-Airrow, an Exciting Product in a Boring Business, p. 5 (undated).
Crane Robert F.
Haas Jon A.
Reynolds Payce
Wentworth Steven W.
Dang Hoang C.
Earth Tool Corporation
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