Cam operated compressor

Claim 2

A refrigerant compressor comprising: a housing having a cylindrical bore therein; a rotatable drive shaft extending through said housing normal to and intersecting an axis of said cylinder; a dual ended piston in said cylinder having a cutout midportion through which said drive shaft extends; a cam portion on said drive shaft with an odd number of circumferentially spaced and outwardly extending lobes with smaller diameter portions therebetween; said cam having diametrically opposite lobes and small diameter portions; bearing means supported at either end of said piston adapted to engage opposite sides of said cam portion of said drive shaft for causing reciprocation of said piston in said cylinder as said drive shaft and cam are rotated; eccentric means supporting said bearings for adjustably positioning said bearings a desirable distance apart to engage opposite sides of said cam whereby said bearings are initially set a maximum distance apart by said eccentric means to enable said cam portion of said drive shaft to be easily inserted between said bearings and subsequently said bearings are moved toward one another by said eccentric means into engagement with opposite sides of said cam to produce desirable engagement of the bearings and the cam surfaces for operating said compressor.

Claim 3

A refrigerant compressor comprising: a housing having a cylindrical bore therein; a rotatable drive shaft extending through said housing and normal to and intersecting an axis of said cylinder; a dual ended piston in said cylinder having an open midportion through which said drive shaft extends; a cam portion on said drive shaft with an odd number of circumferentially spaced and outwardly extending lobes with smaller diameter portions therebetween; said cam having diametrically opposite lobes and small diameter portions; a roller bearing supported at either end of said piston and at opposite sides of said drive shaft adapted to engage opposite surfaces of said cam for producing reciprocation of said piston in said cylinder as said drive shaft and cam are rotated; eccentric pins in either end of said piston for supporting said roller bearings and for adjustably positioning the bearings a desirable distance apart; ports in said housing for providing access to said eccentric pins for permitting them to be rotated while saiD piston is within said cylinder whereby said bearings are initially set a maximum distance apart by rotating said eccentric pins to enable said cam portion of said drive shaft to be easily inserted between said roller bearings and subsequently said roller bearings may be moved toward one another by rotating said eccentric pins to cause engagement of said roller bearings with the opposite sides of said cam to produce desirable engagement of the bearings and the cam surfaces for operating said compressor.

Claim 4

A refrigerant compressor comprising: a housing having a cylindrical bore therein; a rotatable drive shaft extending through said housing and normal to and intersecting an axis of said cylinder; a dual ended piston in said cylinder having an open midportion through which said drive shaft extends; a cam portion on said drive shaft with an odd number of circumferentially spaced and outwardly extending lobes with smaller diameter portions therebetween; said cam having diametrically opposite lobes and small diameter portions; a roller bearing supported at either end of said piston and at opposite sides of said drive shaft adapted to engage opposite surfaces of said cam for producing reciprocation of said piston in said cylinder as said drive shaft and cam are rotated; eccentric pins in either end of said piston for supporting said roller bearings and for adjustably positioning the bearings a desirable distance apart; ports in said housing for providing access to said eccentric pins for permitting them to be rotated while saiD piston is within said cylinder whereby said bearings are initially set a maximum distance apart by rotating said eccentric pins to enable said cam portion of said drive shaft to be easily inserted between said roller bearings and subsequently said roller bearings may be moved toward one another by rotating said eccentric pins to cause engagement of said roller bearings with the opposite sides of said cam to produce desirable engagement of the bearings and the cam surfaces for operating said compressor.

Claim 5

A refrigerant compressor comprising: a housing having a cylindrical bore therein; a rotatable drive shaft extending through said housing normal to and intersecting an axis of said cylinder; a tubular piston in said cylinder having a cutout midportion through which said drive shaft extends; inlet valve means covering the ends of said tubular piston for directing refrigerant from the interior of the compressor into compression chambers adjacent the piston end; cam means on said drive shaft with three circumferentially spaced and outwardly extending lobes with smaller diameter portions therebetween; cam having diametrically opposite lobes and small diameter portions; a roller bearing supported at either end of said piston and at opposite sides of said drive shaft adapted to engage opposite surfaces of said cam for producing reciprocation of said piston in said cylinder as said drive shaft and cam portion are rotated; eccentric pins in either end of said piston for supporting said roller bearings and for adjustably positioning said roller bearings a desirable distance apart; ports in said housing for providing access to said eccentric pins for permitting selective rotation from outside said housing when said piston is within said cylinder; whereby said bearings are initially set a maximum distance apart by rotating said eccentric pins to enable said cam portion of said drive shaft to be easily inserted between said roller bearings and subsequently said roller bearings may be moved toward one another by rotating said eccentric pins to cause engagement of said roller bearings with the opposite sides of said cam.

Claim 6

A refrigerant compressor comprising: a housing having a cylindrical bore therein; a rotatable drive shaft extending through said housing normal to and intersecting an axis of said cylinder; a tubular piston in said cylinder having a cutout midportion through which said drive shaft extends; inlet valve means covering the ends of said tubular piston for directing refrigerant from the interior of the compressor into compression chambers adjacent the piston end; cam means on said drive shaft with three circumferentially spaced and outwardly extending lobes with smaller diameter portions therebetween; cam having diametrically opposite lobes and small diameter portions; a roller bearing supported at either end of said piston and at opposite sides of said drive shaft adapted to engage opposite surfaces of said cam for producing reciprocation of said piston in said cylinder as said drive shaft and cam portion are rotated; eccentric pins in either end of said piston for supporting said roller bearings and for adjustably positioning said roller bearings a desirable distance apart; ports in said housing for providing access to said eccentric pins for permitting selective rotation from outside said housing when said piston is within said cylinder; whereby said bearings are initially set a maximum distance apart by rotating said eccentric pins to enable said cam portion of said drive shaft to be easily inserted between said roller bearings and subsequently said roller bearings may be moved toward one another by rotating said eccentric pins to cause engagement of said roller bearings with the opposite sides of said cam.