Patent ID: 6167784
Filing Date: 2001-01-02
Classification: B25B

Abstract:
A spanner comprising: an elongated first clamping member having a first jaw portion and a handle portion connected to said first jaw portion, said first jaw portion having a pivot plate portion with top and bottom surfaces and a first pivot hole formed through said top and bottom surfaces, said pivot plate portion having a thickness measured between said top and bottom surfaces; a second clamping member having a second jaw portion and a pair of pivot lobes connected to said second jaw portion, said pivot lobes cooperatively defining a receiving space therebetween to permit said pivot plate portion of said first claiming member to extend thereinto, each of said pivot lobes being formed with a second pivot hole that is aligned axially with said first pivot hole, each of said pivot lobes having an inner surface that confronts the other one of said pivot lobes, said receiving space having a width which is measured between said inner surfaces of said pivot lobes; a pivot shaft extending through said first and second pivot holes for mounting pivotally said second claiming member on said first clamping member; and a torsion spring sleeved on said pivot shaft and disposed in said receiving space for biasing said second jaw portion of said second clamping member to move toward said first jaw portion of said first clamping member; wherein one of said top and bottom surfaces of said pivot plate portion of said first clamping member is formed with a recess confining wall that defines a recess around said first pivot hole, said torsion spring being received in said recess so as to be concealed by said recess confining wall and having a first end retained at said first clamping member and a second end retained at said second clamping member, the width of said receiving space of said second clamping member being substantially equal to the thickness of said pivot plate portion of said first clamping member; and wherein said inner surface of a first one of said pivot lobes that confronts said recess is formed with a retaining groove which extends along said inner surface, said second end of said torsion spring having a leg member that is received in said retaining groove for retention at said second clamping member.