Piston pump with cam follower arrangement
First Claim
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1. A pump, comprising:
- a constant velocity cam driven by a rotary shaft;
first and second cylinders;
first and second pistons reciprocable rectilinearly in the respective first and second cylinders;
first and second cam followers which, together with the constant velocity cam, couple the rotary output shaft to said first and second pistons, respectively, for converting rotary motion of the constant velocity cam into reciprocatory motion of said first and second pistons 180°
out of phase with one another;
at least one guide rail extending parallel to an axis along which the pistons are rectilinearly reciprocable;
first and second cam follower sliders each of which is slidably mounted on said at least one guide rail and each of which carries thereon the respective first or second cam follower; and
at least one spring acting on at least one of the first and second cam follower sliders and simultaneously urging both said cam followers toward each other to engage the cam surface of said constant velocity cam;
wherein an entirety of the at least one spring is moveable relative to the first and second cylinders.
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Abstract
A pump primarily for liquid paint includes first and second pistons reciprocable rectilinearly in respective first and second cylinders. The first and second pistons are moved relative to their respective pistons by operation of an A. C. electric motor the rotary output shaft of which is coupled to the first and second pistons by a constant velocity cam and a cam follower mechanism converting rotary motion of the output shaft into reciprocatory motion of the first and second pistons 180° out of phase with one another.
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Citations
22 Claims
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1. A pump, comprising:
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a constant velocity cam driven by a rotary shaft; first and second cylinders; first and second pistons reciprocable rectilinearly in the respective first and second cylinders; first and second cam followers which, together with the constant velocity cam, couple the rotary output shaft to said first and second pistons, respectively, for converting rotary motion of the constant velocity cam into reciprocatory motion of said first and second pistons 180°
out of phase with one another;at least one guide rail extending parallel to an axis along which the pistons are rectilinearly reciprocable; first and second cam follower sliders each of which is slidably mounted on said at least one guide rail and each of which carries thereon the respective first or second cam follower; and at least one spring acting on at least one of the first and second cam follower sliders and simultaneously urging both said cam followers toward each other to engage the cam surface of said constant velocity cam; wherein an entirety of the at least one spring is moveable relative to the first and second cylinders. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A pump, comprising:
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an A.C. electric motor having a rotary output shaft; first and second cylinders; first and second pistons reciprocable rectilinearly in the respective first and second cylinders; a constant velocity cam driven by the rotary output shaft; and first and second cam followers which, together with the constant velocity cam, couple the rotary output shaft to said first and second pistons, respectively, for converting rotary motion of the output shaft into reciprocatory motion of said first and second pistons 180°
out of phase with one another,wherein said first and second cam followers are interconnected by a spring arrangement simultaneously urging both said cam followers toward each other to engage the cam surface of said constant velocity cam, and wherein an entirety of the spring arrangement is moveable following rotary motion of said constant velocity cam; two guide rails extending parallel to and on opposite sides of an axis along which the pistons are rectilinearly reciprocable; first and second cam follower sliders each of which is slidably mounted on both said guide rails and each of which carries thereon a roller defining the respective first or second cam follower; first and second brackets attached to the first and second cam follower sliders, respectively, and having first and second through bores, respectively; a retaining rod extending slidably through the first and second bores and having first and second ends projecting beyond said first and second bores, respectively; and first and second compression springs mounted between (i) the first and second ends of the retaining rod, respectively, and (ii) the first and second brackets, respectively, for simultaneously urging both said cam followers toward each other to engage the cam surface of said constant velocity cam. - View Dependent Claims (16, 17, 18)
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19. A pump, comprising:
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an A.C. electric motor having a rotary output shaft; first and second cylinders; first and second pistons reciprocable rectilinearly in the respective first and second cylinders; a constant velocity cam driven by the rotary output shaft; and first and second cam followers which, together with the constant velocity cam, couple the rotary output shaft to said first and second pistons, respectively, for converting rotary motion of the output shaft into reciprocatory motion of said first and second pistons 180°
out of phase with one another,wherein said first and second cam followers are interconnected by a spring arrangement simultaneously urging both said cam followers toward each other to engage the cam surface of said constant velocity cam, and wherein an entirety of the spring arrangement is moveable following rotary motion of said constant velocity cam; two guide rails extending parallel to and on opposite sides of an axis along which the pistons are rectilinearly reciprocable; first and second cam follower sliders each of which is slidably mounted on both said guide rails and each of which carries thereon a roller defining the respective first or second cam follower; and at least one tension spring directly connecting the first and second cam follower sliders for simultaneously urging both said cam followers toward each other to engage the cam surface of said constant velocity cam. - View Dependent Claims (20, 21, 22)
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Specification