Fastener gun
AssigneeArrow Fastener Co., LLC
InventorIlya Shor
Life of this patent
Estimating the term…
Abstract
A fastener gun includes a housing having a plunger and a power spring for driving a fastener into a workpiece, and a trigger arm pivotally attached to the housing at a trigger pivot. One end of the trigger arm lifts the plunger to bias the power spring when the trigger arm pivots in a first direction toward the housing. A member contacting the trigger arm is provided that moves away from the trigger pivot as the handle moves toward the housing, so that force is applied at different locations on the trigger arm when the handle is squeezed, increasing the mechanical advantage of using the fastener gun.
Claims12
A fastener gun, comprising:
- a housing including a plunger and a power spring for driving a fastener into a workpiece;
- a handle extending upwardly from said housing and pivotally attached to said housing at a handle pivot;
- a trigger arm pivotally attached to said housing at a trigger pivot, said trigger arm operable to lift said plunger to bias said power spring when said trigger arm pivots in a first direction;
- a member contacting the trigger arm, wherein said member moves in the handle away from said trigger pivot when said handle pivots toward the housing;
- and
- a link having a first portion pivotally attached to said housing and a second portion pivotally attached to said member.
A method of making a fastener gun to increase the mechanical advantage in biasing a power spring in the fastener gun, comprising the steps of:
- providing a plunger and a power spring in a housing;
- attaching a handle to the housing at a handle pivot;
- attaching a trigger arm to the housing at a trigger pivot, such that pivoting the handle toward the housing causes the trigger arm to pivot;
- providing a link having a first portion pivotally attached to the housing at a link pivot and a second portion linked to a member contacting the trigger arm;
- wherein the member contacting the trigger arm is adapted to move away from the trigger pivot when the handle pivots toward the housing so that force is applied at a different location on the trigger arm, and
- wherein the link is angled so that a distance between the member contacting the trigger arm and the link pivot remains substantially constant when the handle is pivoted toward the housing.
Dependencies are inferred from the claim text.