Patent ID: 9074589
Filing Date: 2015-07-07
Classification: F04B

Abstract:
1. An assembly of a pump comprising: a first housing and a second housing, said first housing having a first cylinder, said second housing having a second cylinder; a motor between said first and second housings; first and second piston assemblies coupled to opposite ends of a shaft of said motor, the end of said shaft coupled to said first piston assembly extends into said first housing, the end of said shaft coupled to said second piston assembly extends into said second housing; each piston assembly including a piston and an eccentric having a counterweight portion and a stub portion, each said stub portion having a first axis; the eccentric having a hole with a second axis parallel to the first axis and spaced from the first axis, a respective end of the opposite ends of the motor shaft is received in each hole, each eccentric is coupled to the motor shaft, and wherein, each stub portion is journalled to a respective one of the pistons of the first and second piston assemblies, and wherein, the piston of the first piston assembly has at least a first alignment opening which opens through a surface of said piston and extends into said piston, said first alignment opening having an axis parallel to the first and second axes, and the eccentric of said first piston assembly has an alignment opening which opens through a surface of said eccentric and extends into said eccentric, and wherein when the eccentric alignment opening is aligned with the first alignment opening, the piston is in one of a top dead center position or a bottom dead center position, and a first straight pin is insertable into said eccentric alignment opening and said first alignment opening so the pin extends into both the eccentric alignment opening and the first alignment opening at the same time, and said pin is parallel to said second axis of said hole of the eccentric of the first piston assembly which receives said motor shaft.