Method of making a reliable gun
OwnerAndrew W. Sumaninventor
Life of this patent
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Abstract
A gun has parts that slide past one another during operation. A coating is formed on at least a surface of a first part that contacts a second part. At least an upper layer of the coating is porous and comprises a thermoset polymer and a filler. One or both parts may be part of a gas-operated reloading mechanism. The coating prevents jamming by excluding particles, yielding to particles that still manage to intrude, and by providing a reservoir for lubricant. The coating reduces clearances, improves accuracy, and reduces operating temperatures. The coating excludes particles from the lubricant, effectively allowing a large volume of lubricant to be used without the drawback of trapping dirt and other contaminants in the lubricant.
Claims20
A gun, comprising:
- a first metal part and a second metal part that slide past one another;
- and
- a coating over a surface of the first metal part;
- wherein the coating comprises a porous upper layer;
- the porous upper layer comprises a thermoset polymer and a filler;
- and
- the porous upper layer contains oil and expresses some of the oil under stresses induced by operating the gun.
A gun, comprising:
- a first metal part and a second metal part that slide past one another;
- and
- a coating over a surface of the first metal part;
- wherein the coating comprises a porous upper layer;
- the porous upper layer comprises a thermoset polymer and a filler;
- and
- the porous upper layer has an interconnectivity above a percolation threshold.
A method of assembling a gun comprising a first metal part and a second metal part that slide past one another, the method comprising:
- applying a powder of particles over a surface of the first metal part, wherein the particles individually comprise a thermosetting resin having a cure temperature and a filler having a melting point above of the cure temperature;
- curing the thermosetting resin so as to form a coating on the first metal part, wherein the coating comprises a porous upper layer that has a roughness that results from a structure of the particles;
- and
- assembling the first metal part and the second metal part, wherein a thickness of the coating results in an interference fit between the first metal part and the second metal part.
Dependencies are inferred from the claim text.