초록 ▼

A chemical pump includes an access sleeve positioned between a hydraulic driving cylinder and the chemical injection cylinder with a rod coupled between the hydraulic driving piston and the injection piston. The access sleeve structurally secures the driving cylinder to the injection cylinder and in

A chemical pump includes an access sleeve positioned between a hydraulic driving cylinder and the chemical injection cylinder with a rod coupled between the hydraulic driving piston and the injection piston. The access sleeve structurally secures the driving cylinder to the injection cylinder and includes access ports through a sidewall thereof such that when the injection piston is withdrawn into the sleeve, the seals are accessible for replacement or other piston maintenance. According to another aspect of the invention, the diameter of the hydraulic piston is substantially greater than that of the injection piston.

대표청구항 ▼

A liquid pump for a chemical injection molding system comprising: a driving member movable with respect to a support housing; a chemical injection cylinder including an injection piston; rod means for coupling said piston and said driving member for synchronous movement, wherein said driving member

A liquid pump for a chemical injection molding system comprising: a driving member movable with respect to a support housing; a chemical injection cylinder including an injection piston; rod means for coupling said piston and said driving member for synchronous movement, wherein said driving member is capable of moving said rod through a lineal distance sufficient to withdraw said injection piston from said injection cylinder when said piston is fixedly secured thereto; means for securing said injection piston to said rod means to prevent rotation therebetween; and a cylindrical sleeve for coupling said housing and said injection cylinder in spaced relationship and including at least one access port such that said injection piston can be lineally withdrawn from said injection cylinder into said sleeve for servicing through said access port without disassembly of said pump.