READING METHOD OF SCREW ROTATION ANGLE OF HAND-HELD IMPACT WRENCH, HAND-VIBRATION DETECTION METHOD, TIGHTENING EVALUATION METHOD AND CONTROL METHOD OF HAND-HELD POWER SCREW LOOSENING TOOL

Title:

READING METHOD OF SCREW ROTATION ANGLE OF HAND-HELD IMPACT WRENCH, HAND-VIBRATION DETECTION METHOD, TIGHTENING EVALUATION METHOD AND CONTROL METHOD OF HAND-HELD POWER SCREW LOOSENING TOOL

Document Type and Number:

WIPO Patent Application WO/2000/054939

Kind Code:

A1

Abstract:

A detecting means which detects the rotation angle in the right and left rotation directions of a rotation member is provided on a hand-held power screw tightening tool. When a screw is tightened, if there is rebound, the total of the rotation angles in the left rotation direction is deducted from the total of the rotation angles in the right rotation direction to obtain a whole rotation angle (P). A rotation angle during deceleration when impact is applied is denoted as $g(D)H and totaled. Then a hand-vibration angle is calculated by a formula; Hand vibration angle = Total of (P - Pd) - Total of $g(D)H (wherein Pd denotes the predetermined designed impact angle of an impact rench and expresses an angle corresponding to 360 °/m when m times of impacts are generated while the rotation member makes one turn). When the total of the rotation angle $g(D)H during deceleration when impact is applied reaches the designed impact angle (Pd), the rotation of the rotation member is discontinued. When a screw is loosened, the rotation member is turned in an opposite direction and, in the same way, when a predetermined rotation speed in the loosening direction is reached, the rotation of the rotation member is discontinued.

More Like This:

JPS5959278	[Title of the device] The bit holding mechanism of an air impact wrench
JP2002254336	POWER TOOL

Inventors:

YAMADA MASAKAZU (JP)
SHIBATA RYOICHI (JP)
NAGARE YOSHIHIKO (JP)

Application Number:

PCT/JP2000/001515

Publication Date:

September 21, 2000

Filing Date:

March 13, 2000

Export Citation:

Click for automatic bibliography generation Help

Assignee:

KUKEN CO LTD (JP)
YAMADA MASAKAZU (JP)
SHIBATA RYOICHI (JP)
NAGARE YOSHIHIKO (JP)

International Classes:

B25B21/02; B25B23/14; B25B23/142; B25B23/145; (IPC1-7): B25B21/02

Foreign References:

JPS62130184A	1987-06-12
JPS63185584A	1988-08-01
JPH1071576A	1998-03-17
JPS63256376A	1988-10-24
JPH1080828A	1998-03-31

Other References: