Patent Number: 6,167,784

Title: Spanner with torsion spring

Abstract: A spanner includes first and second clamping members. The first clamping member has a handle portion and a first jaw portion with a pivot plate portion that has a first pivot hole formed through top and bottom surfaces thereof. The second clamping member has a second jaw portion and a pair of pivot lobes which cooperatively define a receiving space therebetween to permit the pivot plate portion to extend thereinto and which are formed with second pivot holes aligned axially with the first pivot hole. A pivot shaft extends through the first and second pivot holes for mounting pivotally the second clamping member on the first clamping member. A torsion spring is sleeved on the pivot shaft, and is disposed in the receiving space for biasing the second jaw portion to move toward the first jaw portion. One of the top and bottom surfaces of the pivot plate portion is formed with a recess confining wall that defines a recess around the first pivot hole for receiving the torsion spring so that the torsion spring is concealed by the recess confining wall. The receiving space has a width which is measured between confronting inner surfaces of the pivot lobes and which is substantially equal to the thickness of the pivot plate portion measured between the top and bottom surfaces of the pivot plate portion.

Inventors: Lin; Ching-Chang (Taichung City, TW)


International Classification: B25B 13/00 (20060101); B25B 13/28 (20060101); B25B 013/28 ()

Expiration Date: 01/02/2018