US 8,555,752 B1Granted

Ratchet wrench

OwnerYu Yen Chieninventor

Life of this patent

Estimating the term…

Abstract

A ratchet wrench includes a driving head, a retaining ring engaged in the driving head, a driving member rotatably engaged in the driving head and having a gear, and a pawl engaged in the driving head and having a lever arm extended from a shaft, and one or more teeth formed on the lever arm for engaging with the gear and for determining the driving direction of the driving member by the driving head and the handle, the shaft includes a slot for engaging with the retaining ring and for allowing the retaining ring to apply a spring biasing force onto the shaft and to force the teeth of the lever arm to engage with the gear.

Claims6

Dependent claims

A ratchet wrench comprising:

a handle including a driving head provided thereon, said driving head including a chamber formed therein, and including a recess formed in said driving head and communicating with said chamber of said driving head, and including a first peripheral groove formed in said driving head and communicating with said chamber and said recess of said driving head, and including a projection extended into said recess of said driving head for forming and defining a compartment and a space in said recess of said driving head,
a first retaining ring engaged into said first peripheral groove of said driving head and extended through said recess of said driving head,
a driving member including a body element rotatably received and engaged in said chamber of said driving head, and including a gear formed and provided on said body element and faced and directed toward said first peripheral groove and said recess of said driving head and said first retaining ring, and
a pawl including a shaft received and engaged in said compartment of said recess of said driving head, and including a lever arm extended from said shaft and extended into said space of said recess of said driving head, and including at least one tooth formed and provided on said lever arm for selectively engaging with said gear of said driving member and for determining a driving direction of said driving member by said driving head and said handle, said shaft including a slot formed therein for engaging with said first retaining ring and for allowing said first retaining ring to apply a spring biasing force onto said shaft of said pawl, and for biasing and forcing said at least one tooth of said lever arm to engage with said gear, and
said at least one tooth of said lever arm being forced to engage with said gear of said driving member when said driving head and said handle are rotated and driven in a driving direction for allowing said driving member to be rotated and driven by said driving head and said handle in the driving direction, and said at least one tooth of said lever arm being allowed to be moved away from said gear of said driving member and to be selectively received and engaged in said space of said recess of said driving head when said driving head and said handle are rotated and driven in an opposite releasing direction, for allowing said driving head and said handle to be rotated freely relative to said driving member in the opposite releasing direction.

2 more elements

Dependencies are inferred from the claim text.

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Abstract

A ratchet wrench comprising:

a handle including a driving head provided thereon, said driving head including a chamber formed therein, and including a recess formed in said driving head and communicating with said chamber of said driving head, and including a first peripheral groove formed in said driving head and communicating with said chamber and said recess of said driving head, and including a projection extended into said recess of said driving head for forming and defining a compartment and a space in said recess of said driving head,
a first retaining ring engaged into said first peripheral groove of said driving head and extended through said recess of said driving head,
a driving member including a body element rotatably received and engaged in said chamber of said driving head, and including a gear formed and provided on said body element and faced and directed toward said first peripheral groove and said recess of said driving head and said first retaining ring, and
a pawl including a shaft received and engaged in said compartment of said recess of said driving head, and including a lever arm extended from said shaft and extended into said space of said recess of said driving head, and including at least one tooth formed and provided on said lever arm for selectively engaging with said gear of said driving member and for determining a driving direction of said driving member by said driving head and said handle, said shaft including a slot formed therein for engaging with said first retaining ring and for allowing said first retaining ring to apply a spring biasing force onto said shaft of said pawl, and for biasing and forcing said at least one tooth of said lever arm to engage with said gear, and
said at least one tooth of said lever arm being forced to engage with said gear of said driving member when said driving head and said handle are rotated and driven in a driving direction for allowing said driving member to be rotated and driven by said driving head and said handle in the driving direction, and said at least one tooth of said lever arm being allowed to be moved away from said gear of said driving member and to be selectively received and engaged in said space of said recess of said driving head when said driving head and said handle are rotated and driven in an opposite releasing direction, for allowing said driving head and said handle to be rotated freely relative to said driving member in the opposite releasing direction.

2 more elements