SHOCK-ABSORBING MECHANISM FOR HYDRAULIC HAMMERING DEVICE

Title:

SHOCK-ABSORBING MECHANISM FOR HYDRAULIC HAMMERING DEVICE

Document Type and Number:

WIPO Patent Application WO/1997/014870

Kind Code:

A1

Abstract:

The present invention relates to a shock-absorbing mechanism for hydraulic hammering devices such as machine drills, which mechanim damps an energy reflected from a shank rod (2) to reduce possible damages and permits a bit, even when a machine drill body (1) cannot advance to a predetermined position until a subsequent hammering after it has moved back due to insufficient thrust, to advance into contact with a base rock to enable striking thereagainst for improvement of hammering efficiency. A machine drill comprises a hammering mechanism for striking against the shank rod (2), and a chuck driver bush (13) for transmitting to the shank rod (2) a thrust toward an object being crushed. Provided rearwardly of the chuck driver bush (13) are a front damping piston (4), which provides less thrust than that of the machine drill body (1), and a rear damping piston (5), which provides greater thrust than that of the machine drill body (1).

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Inventors:

KANEKO TSUTOMU (JP)

Application Number:

PCT/JP1996/002996

Publication Date:

April 24, 1997

Filing Date:

October 16, 1996

Export Citation:

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Assignee:

FURUKAWA CO LTD (JP)
KANEKO TSUTOMU (JP)

International Classes:

B25D9/14; B25D17/24; B25D9/26; E21B1/00; E21B1/02; E21B1/26; E21B1/38; E21B6/00; (IPC1-7): E21C3/04; B25D17/24

Foreign References:

JPH02262974A

1990-10-25

Other References: