Caulk gun
AssigneeDripless, Inc.
InventorDonal R. Broesamle
Life of this patent
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Abstract
A caulk gun is provided with a forward-biasing mechanism to maintain contact between the caulk tube and the piston rod. The forward biasing mechanism is of simple construction and is piggy-backed to the trigger housing of the caulk gun. The operation of the forward-biasing mechanism relies on a friction grip which surrounds the piston rod. This friction grip is urged in the forward direction by a spring contained within the housing of the forward-biasing mechanism, and thereby biases the piston rod in the forward direction, while relieving the back pressure inside the caulk tube.
Claims16
In a caulking gun having a tube housing for receiving a tube of caulking material, a trigger housing attached to the tube housing, a handle and a cooperating trigger attached to the trigger housing, a piston member attached to a piston rod for driving caulk out of a tube, and a releasable driving means whereby the operation of the trigger toward the handle advances the piston rod and piston member toward the end of the tube housing remote from the trigger housing, thereby pressuring caulk from the caulk tube, a forward-biasing mechanism for gently biasing the piston rod and piston member toward a caulk tube while providing for the relief of pressure inside a caulk tube, said forward-biasing mechanism comprising:
- a forward-biasing mechanism housing affixed to the trigger housing;
- a friction grip for slidably engaging the piston rod;
- and
- spring means for urging said friction grip in the direction of the piston rod advancement.
Dependencies are inferred from the claim text.