HUMAN BODY VIBRATION EVALUATION DEVICE AND HAND-HELD VIBRATION TOOL

Title:

HUMAN BODY VIBRATION EVALUATION DEVICE AND HAND-HELD VIBRATION TOOL

Document Type and Number:

WIPO Patent Application WO/2000/031507

Kind Code:

A1

Abstract:

A three-axis vibration acceleration pickup (13), an A/D converter (19), a microcomputer (20), a display (11) and others are provided inside the handle portion (2) of a hand-held vibration tool such as an angle grinder (1). Each time a continuous work is interrupted, an 8-hour equivalent acceleration value (ahw(eq.8h)) is determined based on a detected vibration acceleration signal and is accumulated in one day. At each interruption, a frequency load vibration acceleration effective value (ahw) is determined and, based on this value, the 8-hour equivalent acceleration value (ahw(eq.8h)) is calculated. Using this 8-hour equivalent acceleration value (ahw(eq.8h)), a residual margin time (tpi) is determined and displayed to precisely rate vibrations imparted to a human body and thereby securely protect the human body from vibrations.

Inventors:

OHKUBO MASAAKI (JP)
MAEDA SETSUO (JP)

Application Number:

PCT/JP1998/005298

Publication Date:

June 02, 2000

Filing Date:

November 25, 1998

Export Citation:

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Assignee:

FUJI AIR TOOLS CO LTD (JP)
OHKUBO MASAAKI (JP)
MAEDA SETSUO (JP)

International Classes:

B24B23/00; B24B55/00; G01H1/12; (IPC1-7): G01H1/00; B25D17/04; B24B23/00

Foreign References:

JPH03185317A	1991-08-13
JPH0385414A	1991-04-10
JPS5146172A	1976-04-20

Other References: