Dispensing gun for semi-liquid material

Claim 2

A dispensing gun for semi-liquid material carried in a collapsible tube and adapted for connection to a compressed air line in an industrial shop or the like comprising, a body defining an interior chamber for the tube, an outlet opening at one end of the body to receive the dispenser tip of the tube, a pressure air inlet orifice adjacent the other end of the body to limit the air flow into the chamber and reduce the pressure thereof, a pair of air outlet orifices from said body both of a size greater than said air inlet orifice, one of said outlet orifices being a pressure relief passage and a ball check valve positioned to close said pressure relief passage, a spring acting on said ball check valve, the other air outlet orifice being selectively closable by a user of the gun whereby closure of the latter orifice establishes a static pressure in the chamber to progressively collapse said tube and cause dispensing of material, and means for adjusting the force of said spring to vary the static pressure in said chamber.

Claim 3

A dispensing gun as defined in claim 1 wherein said body carries a fitting provided with the pressure air inlet orifice and the pressure relief passage, means for holding the fitting in secured relation to the body while permitting rotation thereof and a pressure air hose connection in said fitting providing for flow of pressure air to said pressure air inlet orifice whereby positioning of said gun relative to the pressure air hose is facilitated.

Claim 4

A dispensing gun for a semi-liquid material carried in a collapsible tube having a dispensing tip at one end comprising, a two-part body defining a tube-receiving chamber and with quick detach structure between the body parts to facilitate insertion and removal of a tube and with a sealing member between the body parts, an outlet opening at one end of the body to receive said tip, a rotatable fitting at an opposite end of the body having a connection to a compressed air hose and in communication with an inlet orifice to said chamber, a pressure relief passage in said fitting for flow of air from said chamber and a ball check yieldably urged toward said pressure relief passage to modulate flow from the chamber and maintain a minimal bypass of air to obtain a constant static pressure in the chamber, and a second outlet orifice for flow of air from said chamber positioned for manual closure by an operator, said pressure relief passage and second outlet orifice being larger than said air inlet orifice whereby when said second outlet orifice is open there is no pressure in said chamber but when said second outlet orifice is closed there is constant static pressure in said chamber as established by the pressure relief passage and ball check which progressively collapses said tube and dispenses material through the tip thereof.

Claim 5

A dispensing gun for a semi-liquid material carried in a collapsible tube having a dispensing tip at one end comprising, a two-part body defining a tube-receiving chamber and with quick detach structure between the body parts to facilitate insertion and removal of a tube and with a sealing member between the body parts, an outlet opening at one end of the body to receive said tip, a rotatable fitting at an opposite end of the body having a connection to a compressed air hose and in communication with an inlet orifice to said chamber, a pressure relief passage in said fitting for flow of air from said chamber and a ball check yieldably urged toward said pressure relief passage to modulate flow from the chamber and maintain a minimal bypass of air to obtain a constant static pressure in the chamber, and a second outlet orifice for flow of air from said chamber positioned for manual closure by an operator, said pressure relief passage and second outlet orifice being larger than said air inlet orifice whereby when said second outlet orifice is open there is no pressure in said chamber but when said second outlet orifice is closed there is constant static pressure in said chamber as established by the pressure relief passage and ball check which progressively collapses said tube and dispenses material through the tip thereof.

Claim 6

A dispensing gun as defined in claim 3 wherein said ball check is urged to a closed position by a spring, and means for adjusting the force of the spring to adjust said static pressure.