US 6,282,993 B1Granted

Ratchet mechanism for a ratchet tool

AssigneesTseng Shu-Ying, Yu Hua-Rung

InventorsMsrk A. Forman, Learng See-Bang

Life of this patent

Estimating the term…

Loading patent…

Abstract

A ratchet tool a shank and a head which has a hole and a recess is defined in an inside of the hole. Two identical plates are respectively connected to two sides of the head and each plate has a ring portion engaged with the hole. A ring member with a toothed outer periphery is received in the hole of the head and retained by the two ring portions. A tongue portion extends from each the ring portion and is engaged with the recess. A slot and an aperture are respectively defined through the tongue portion. The ring member has a polygonal inside to be engaged with an object. A pawl member is received in the recess and has a curved toothed surface which is engaged with the ring member. A protrusion extends from a top of the pawl member and is movably received in the slot. A pushing member is movably engaged with a second end of the pawl member and an elongated hole is defined in the pushing member. A pin extends through the two apertures in the two plates and the elongated hole. The pawl member is pushed to engaged with the ring member and positioned by the pushing member.

Claims5

Dependent claims

A ratchet tool comprising:

a shank and a head connected to an end of said shank, said head having a hole and a recess defined in an inside of said hole, two identical plates respectively connected to two sides of said head and each plate having a ring portion engaged with said hole, a tongue portion extending from each said ring portion and engaged with said recess, a slot and an aperture respectively defined through said tongue portion;
a ring member rotatably received in said hole in said head and said ring member having a toothed outer periphery, said ring member having a polygonal inside, a pawl member received in said recess and having a curved toothed surface defined in a first end of said pawl member, said curved toothed surface facing said ring member, a protrusion extending from a top of said pawl member and said protrusion movably received in said slot, and
a pushing member having a first end thereof engaged with a second end of said pawl member, a second end of said pushing member engaged with an inside of said recess, said second end of said pawl member located opposite to said curved toothed surface, an elongated hole defined in said pushing member and a pin extending through said two apertures in said two plates and said elongated hole.

Dependencies are inferred from the claim text.