(19)
(11) EP 1 413 399 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
06.05.2004 Bulletin 2004/19

(43) Date of publication A2:
28.04.2004 Bulletin 2004/18

(21) Application number: 03019741.2

(22) Date of filing: 29.08.2003
(51) International Patent Classification (IPC)7: B25B 13/46
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT RO SE SI SK TR
Designated Extension States:
AL LT LV MK

(30) Priority: 26.09.2002 US 254592

(71) Applicant: Chen, Terence
Lo Tung Town, Yi Lan Hsien (TW)

(72) Inventor:
  • Chen, Terence
    Lo Tung Town, Yi Lan Hsien (TW)

(74) Representative: Casalonga, Axel et al
BUREAU D.A. CASALONGA - JOSSE Paul-Heyse-Strasse 33
80336 München
80336 München (DE)

   


(54) Ratchet wrench


(57) A one-way wrench includes an annular head, an annular gear, a pawl and an elastic element. The annular head includes a circular space defined therein and a crescent space defined in the wall of the circular space. The annular gear is put in the circular space. The annular gear includes teeth extending from an external face. The pawl is put in the crescent space. The pawl includes teeth extending from a side for engagement with the teeth of the annular gear and first and second protrusions both extending from an opposite side. The elastic element is compressed between the pawl and the wall of the crescent space. The wall of the crescent space pushes the first protrusion as the annular head drives the annular gear in a direction through the pawl. The wall of the crescent space pushes the second protrusion so as to pivot the pawl from the annular gear as the annular head rotates relative to the annular gear in an opposite direction.






Search report