Caulking gun with flow stopper

A gun construction including:

• (a) a frame adapted to removably receive a tube of viscous material;
• (b) a plunger movably mounted with respect to the frame;
• (c) a handle mounted on the frame;
• (d) trigger means mounted on the handle for advancing the plunger forwardly to urge material outwardly through a spout of the tube of viscous material;
• (e) guide means mounted on the frame;
• (f) blade means movably mounted on the guide means and engageable with the spout of the tube of viscous material and movable between a flow-blocking position and an open position, said blade means being adapted to cut through a side of the spout and abut a far side of said spout to block the flow of viscous material from the spout when the blade means is in the flow-blocking position;
• and
• (g) lever means operatively engaged with the blade means to move said blade means between a flow-blocking position and an open position.

An improved caulking gun construction of the type having a frame, a plunger, a handle and a trigger mechanism for advancing the plunger forwardly for urging caulking material outwardly through a spout of a tube of caulking material mounted on the frame, and in which the spout is formed of a severable material, wherein the improvement includes:

• (a) guide means mounted on the frame, said guide means including a channel having a straight portion which extends along the bottom of the frame and an integrally connected curved portion which extends upwardly across the front of the frame;
• (b) keeper means mounted on the curved channel portion and engageable with the spout of the tube for securing the tube spout in a fixed position with respect to the guide means;
• (c) blade means movably mounted on the guide means and engageable with the spout and movable between a flow-blocking position and an open position;
• and
• (d) lever means operatively engaged with the blade means for moving said blade means between a flow-blocking position and an open position.