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US 7,089,830 B2Granted
Compact wrench with three-stage control
OwnerBobby Huinventor
Life of this patent
Estimating the term…
Abstract
A wrench includes a handle, a head, a drive member rotatably mounted in the head, two pawls, an elastic element for biasing at least one of the pawls to engage with the drive member, and a pivotable switch. An end of each pawl defines a space. The end of each pawl further includes a protrusion. The spaces of the pawls overlap with each other and the protrusion of each pawl is located in the space of the other pawl. The switch includes an actuating member extending into the overlapped spaces of the pawls and between the protrusions of the pawls. The actuating member of the switch is pivotable to engage with and thus move the protrusion of one of the pawls, disengaging the pawl from the drive member and thereby changing a driving rotation direction and a free rotation direction of the wrench.
Claims35
A wrench comprising:
- a handle including an end, the handle further including a hole defined in a side thereof;
- a head formed on the end of the handle, the head including a compartment, a cavity being defined in an inner periphery delimiting the compartment and communicating with the hole of the handle;
- a drive member rotatably mounted in the compartment, the drive member including a plurality of teeth in an outer periphery thereof;
- two pawls slidably mounted in the cavity, each said pawl including a first end and a second end, the first end of each said pawl including a plurality of teeth in a side thereof for disengageably engaging with the teeth of the drive member, the second end of each said pawl defining a space, the second end of each said pawl further including a protrusion, the pawls being so mounted that the spaces of the pawls overlap with each other and that the protrusion of each said pawl is located in the space of the other pawl;
- an elastic element mounted between the pawls for biasing the teeth of each said pawl to engage with the teeth of the drive member;
- and
- a switch pivotally mounted in the hole of the handle, the switch including an actuating member extending into the overlapped spaces of the pawls and between the protrusions of the pawls, the actuating member of the switch being pivotable to engage with and thus move the protrusion of one of the pawls, disengaging the teeth of said one of the pawls from the teeth of the drive member and thereby changing a driving rotation direction and a free rotation direction of the wrench.
4 more elements
A wrench comprising:
- a handle including an end, the handle further including a hole defined in a side thereof;
- a head formed on the end of the handle, the head including a compartment, a cavity being defined in an inner periphery delimiting the compartment and communicating with the hole of the handle;
- a drive member rotatably mounted in the compartment;
- two pawls slidably mounted in the cavity, each said pawl including an end defining a space, the end of each said pawl further including a protrusion, the pawls being so mounted that the spaces of the pawls overlap with each other and that the protrusion of each said pawl is located in the space of the other pawl;
- an elastic element for biasing at least one of the pawls to engage with the drive member;
- and
- a switch pivotally mounted in the hole of the handle, the switch including an actuating member extending into the overlapped spaces of the pawls and between the protrusions of the pawls, the actuating member of the switch being pivotable to engage with and thus move the protrusion of one of the pawls, disengaging said one of the pawls from the drive member and thereby changing a driving rotation direction and a free rotation direction of the wrench.
4 more elements
A wrench comprising:
- a handle including an end, the handle further including a hole defined in a side thereof;
- a head formed on the end of the handle, the head including a compartment, a cavity being defined in an inner periphery delimiting the compartment and communicating with the hole of the handle;
- a drive member rotatably mounted in the compartment;
- two pawls slidably mounted in the cavity;
- an elastic element for biasing at least one of the pawls to engage with the drive member;
- and
- a switch mounted in the hole of the handle and pivotable between three positions, the switch including an actuating member for urging a selected one of the pawls to disengage from the drive member, thereby changing a driving rotation direction and a free rotation direction of the wrench;
- wherein one of the pawls is disengaged from the drive member and the other pawl is engaged with the drive member when the switch is in a first one of the three positions, allowing clockwise driving rotation and counterclockwise free rotation of the wrench;
- wherein both of the pawls are engaged with the drive member when the switch in a second one of the three positions, allowing driving rotation of the wrench in either direction;
- and
- wherein said one of the pawls is engaged with the drive member and the other pawl is disengaged from the drive member when the switch is in a third one of the three positions, allowing counterclockwise driving rotation and clockwise free rotation of the wrench.
8 more elements
Dependencies are inferred from the claim text.