Spraying apparatus having internal chamber selectively pressurized by a pressurizing device

Claim 1

A spraying apparatus comprising a material container having a supply chamber located therein; a variable volume pressure chamber which stores the material to be sprayed at a pressure higher than the ambient pressure, a bottom of said chamber being movable to vary the volume of said chamber; spraying head including a manually operated dispensing valve; a dispensing duct in communication with said pressure chamber and said dispensing valve; a suction conduit connecting said pressure chamber to said supply chamber; actuating means, cooperating with said pressure chamber, for selectively increasing the volume of said pressure chamber to create a pressure drop in said pressure chamber to suck material from said supply chamber into said pressure chamber; a nonreturn valve arranged in said suction conduit; pressurizing means, connected to said pressure chamber, for pressurizing the material within said pressure chamber; wherein said pressurizing means and said actuating means are fastened to said chamber bottom, and said actuating means comprises an actuating cord having one end secured to said chamber bottom and another end secured to a winding spool, said cord being adapted to be wound onto and from said winding spool, said winding spool being arranged in a housing positioned below said material container and being rotatably mounted in said housing, said winding spool being rotatable from outside of said housing by a driving spool which is connected to said winding spool and around which a pull cord is wound, one end of said pull cord being fixed to said driving spool and the other end of said pull cord being adapted to be gripped from outside of said housing.