초록 ▼

An anti-pack out seal for use between fluid containing cylinders and pistons which are axially slideable therein and which extend through an opening in the end of such pistons. This seal has an annular channel adjacent to a resilient elastomeric seal ring, through which channel, an air stream contai

An anti-pack out seal for use between fluid containing cylinders and pistons which are axially slideable therein and which extend through an opening in the end of such pistons. This seal has an annular channel adjacent to a resilient elastomeric seal ring, through which channel, an air stream containing an oil mist is circulated to remove solid particles of material which may separate or pack out from the fluid in the cylinder and in addition to prevent curing of the solid particles between the cylinder, the elastomeric seal and the bearing surrounding the cylinder.

대표청구항 ▼

[ What is claimed is:] [1.] In combination with a cylinder containing an anaerobic first fluid material and a piston which is axially slideable therein, an anti-pack out seal comprising:housing having a circular hole therethrough mounted in axial alignment with the cylinder at one end thereof;the pi

[ What is claimed is:] [1.] In combination with a cylinder containing an anaerobic first fluid material and a piston which is axially slideable therein, an anti-pack out seal comprising:housing having a circular hole therethrough mounted in axial alignment with the cylinder at one end thereof;the piston having one end inside the cylinder and extending from the cylinder through the circular hole to the outside of the housing, said piston adapted to exert dispensing pressure on the anaerobic fluid when moved axially into the cylinder;a resilient annular seal ring fastened in the circular hole at an axially inward end of the housing, the seal ring having an axially inner end facing toward the inside of the cylinder and an axially outer end facing toward the outside of the cylinder, the seal ring having an annular seal clearance space between the seal ring and the piston extending axially inwardly from the axially outer end of the seal ring;the housing having an annular channel located adjacent the seal ring at the axially outer end thereof;an annular channel for circulating a non-anaerobic fluid containing air through the channel and the annular seal clearance space of the seal ring to prevent curing of the anaerobic fluid in the area of the resilient annular seal ring which would thereby increase the friction between the resilient annular seal ring and the piston;the cross sectional contour of the housing being such as to provide an annular clearance space between the housing and the piston in the area between the annular channel and the annular seal clearance space of the resilient annular seal ring to provide open communication therebetween.