Human body vibration evaluation device and hand-held vibration tool

• US 6,490,930 B1
• Filed: 09/27/2000
• Issued: 12/10/2002
• Est. Priority Date: 05/23/1997
• Status: Expired due to Fees

• Current Assignee: Fuji Air Tools Co. Ltd. (Atlas Copco AB)
• Original Assignee: Fuji Air Tools Co. Ltd. (Atlas Copco AB)
• Inventors: Ohkubo, Masaaki, Maeda, Setsuo
• Primary Examiner(s): Williams, Hezron
• Assistant Examiner(s): SAINT SURIN, JACQUES M
• Application Number:
  US09/600,989
• Time in Patent Office: 804 Days
• Field of Search: 736/61, 735/70, 734/321, 738/653, 738/659, 73D/IG.1
• US Class Current: 73/661
• CPC Class Codes: B24B 23/00 Portable grinding machines, e.g. hand-guided; Accessories therefor B24B7/18 takes precedence; for grinding seat surfaces B24B15/00; having a flexible shaft B24B27/027; grinders for cutting-off B24B27/08; dust extraction equipment B24B55/10; details or components, e.g. casings, bodies of portable power-driven tools not particularly related to the operation performed B25F5/00
• CPC Class Codes: B24B 55/00 Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition of general applicability for machine tools B23Q11/00; in general F16P
• CPC Class Codes: G01H 1/12 of longitudinal or not specified vibrations

Abstract

A three-axis vibration acceleration pickup with the handle of a vibration-generating tool such as, an angle grinder or the like, feeds detected vibrations along the three axes to an A/D converter 19. A microcomputer processes the digitized data to feed a display portion. Each time continuous operation of the tool is interrupted, an 8-hour equivalent acceleration value is obtained based on the detected vibration acceleration signal. The result is added to previous acceleration values so as to accumulatively add up the total value in one day. Each time continuous operation is interrupted, a frequency load vibration acceleration value is obtained, and an 8-hour equivalent acceleration value is obtained based on this. A residual surplus time is obtained and displayed by using the 8-hour equivalent acceleration value.

Claims

1. A human body vibration evaluating apparatus comprising:

a vibration detecting means for detecting vibrations applied from an external source to a human body;

an analyzing means for analyzing on signals detected by said vibration detecting means;

a displaying means for displaying based on analyzing results from said analyzing means;

said analyzing means taking an 8-hour equivalent acceleration value about said vibrations detected continuously each time said vibrations are interrupted; and

said total 8-hour equivalent acceleration value up to a present time point being determined by accumulatively adding said 8-hour equivalent acceleration value in one day.

2. A human body vibration evaluating apparatus of claim 1, wherein:

said human body vibration evaluation apparatus is mounted in a holding vibration apparatus for giving vibrations to said human body.

3. A holding vibration tool provided with a human body vibration evaluating apparatus of claim 2.

4. A holding vibration tool of claim 2, where said vibration detecting means is disposed in a handle of said tool.

5. A human body vibration evaluating apparatus comprising:

a vibration detecting means for detecting said vibrations applied from an external source to said human body;

an analyzing means for analyzing based on signals detected by said vibration detecting means;

a displaying means for displaying based on analyzing results taken by said analyzing means;

said analyzing means taking a frequency load vibration acceleration effective value about said vibrations detected continuously each time said vibrations are interrupted;

a limit time (tg) where an 8-hour equivalent acceleration value forming a prescribed reference value when said vibration is to continue using said frequency load vibration acceleration effective value;

a residual surplus time (tp) calculated by subtracting said total time, where said vibration is detected by said vibration detecting means up to said present time point in one day, from said limit time (tg).

6. A human body vibration evaluating apparatus of claim 5, wherein:

said human body vibration evaluating apparatus is mounted in a holding vibration apparatus for giving vibrations to said human body.

7. A holding vibration tool of claim 6, where said human body vibration evaluating apparatus is disposed in a handle portion of said tool.