Hammer device

Details Hammer device Hammer device

1997-05-07

1999-08-03

Dang, Hoang C.

Boring or penetrating the earth

Below-ground impact members

Fluid-operated

173126, E21B 414

Patent

active

059312432

ABSTRACT:
The present invention relates to a hammer device, preferably a down-the-hole hammer, including a drill bit (11) and a piston (10) reciprocating therebehind to periodically strike the drill bit. The drill bit (11) includes front (11a) and rear (11b) portions of different impedance, and the piston (10) includes front (10b) and rear (10a) portions of different impedance. In the drill bit, the front portion (11a) has a larger impedance than the rear portion (11b). In the piston, the rear portion (10a) has a larger impedance than the front portion (10b). The length of the drill bit front portion (11a) is about twice the length of the drill bit rear portion (11b). The length of the piston rear portion (10a) is about twice the length of the piston front portion (11b). The invention further relates to a drill bit (11) and a piston (10), per se.

REFERENCES:
patent: 3570609 (1971-03-01), Wise
patent: 3630292 (1971-12-01), Vincent
patent: 4077304 (1978-03-01), Bouyoucos
patent: 5305841 (1994-04-01), Beccu
Llundberg et al., "Influence of Geometrical Design on the Efficiency of a Simple Down-the-Hole Percussive Drill"; Int. J. Rock Mech. Min, Science & Geomech., vol. 23, No. 3, pp. 281-287, 1986.

Affiliated with

Also associated with

Rating

Hammer device does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Hammer device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hammer device will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-840862