Simplified positive displacement syrup pump assembly for drink machines

Claim 2

In a simplified positive displacement pump assembly, a chamber-forming shell, an inlet valve body integrally formed with said shell, an inlet valve seat-forming member removably received by said inlet valve body, an outlet valve seat-forming member integrally formed with said shell, an outlet body removably received by said outlet valve seat-forming member, an arm mounted on said shell for movement between a first position and a second position, and interengageable means on said arm and on said inlet valve seat-forming member and said outlet valve body for retaining said inlet valve seat-forming member and said outlet valve body assembled on said shell in said first position of said arm and for releasing said inlet valve seat-forming member and said outlet valve body in the second position of said arm, said arm being mounted for pivotal movement at a location intermediate its ends, said interengageable means comprising necks formed on said inlet valve seat-forming member and said outlet valve body respectively and means forming slots in the ends of said arm for receiving said necks.

Claim 3

A simplified positive displacement pump assembly including in combination, a first chamber forming shell, an inlet valve assembly, an outlet valve assembly, first readily releasable means for retaininG said inlet and outlet valve assemblies in assembled relationship with said first shell, a second shell, a diaphragm, second releasable means for securing said shells in assembled relationship with a peripheral portion of said diaphragm clamped between said shells, the portion of said diaphragm within said peripheral portion being imperforate, a retainer plate in said first shell, said retainer plate engaging one side of said diaphragm in the absence of a positive connection thereto in the assembled condition of said shells and being free of said diaphragm upon disassembly of said shells, a rod mounted for movement on said second shell, a plate-like head on said rod engaging the other side of said diaphragm in the absence of a positive connection thereto in the assembled condition of said shells and being free of said diaphragm upon disassembly of said shells, a spring in said first shell for urging said retainer plate into engagement with said one side of said diaphragm and for urging said other side of said diaphragm into engagement with said head, and means for driving said rod against the return of said spring.

Claim 4

A simplified positive displacement pump assembly including in combination, a first chamber forming shell, an inlet valve assembly, an outlet valve assembly, first readily releasable means for retaininG said inlet and outlet valve assemblies in assembled relationship with said first shell, a second shell, a diaphragm, second releasable means for securing said shells in assembled relationship with a peripheral portion of said diaphragm clamped between said shells, the portion of said diaphragm within said peripheral portion being imperforate, a retainer plate in said first shell, said retainer plate engaging one side of said diaphragm in the absence of a positive connection thereto in the assembled condition of said shells and being free of said diaphragm upon disassembly of said shells, a rod mounted for movement on said second shell, a plate-like head on said rod engaging the other side of said diaphragm in the absence of a positive connection thereto in the assembled condition of said shells and being free of said diaphragm upon disassembly of said shells, a spring in said first shell for urging said retainer plate into engagement with said one side of said diaphragm and for urging said other side of said diaphragm into engagement with said head, and means for driving said rod against the return of said spring.

Claim 5

An assembly as in claim 2 in which said diaphragm is formed with a locating boss and in which said plate is formed with a recess for receiving said boss.

Claim 6

A pump assembly as in claim 2 in which said shells have respective peripheral flanges adapted to butt in the assembled condition of said shells, said flanges being formed with annular recesses, and an O-ring integrally formed with said diaphragm disposed in said recesses in the assembled condition of said shells.

Claim 7

A pump assembly as in claim 2 in which said valve-retaining means comprises an arm, means mounting said arm on said first shell for movement between a first position and a second position and interengageable means on said arm and on said valve assemblies for engaging in said first position to retain said assemblies and for disengaging in said second position to release said valve assemblies.

Claim 8

An assembly as in claim 2 in which said inlet valve assembly comprises a valve body formed integrally with said first shell and a valve seat-forming member releasably received in said body.

Claim 9

An assembly as in claim 2 in which said outlet valve assembly comprises a valve seat forming portion integrally formed with said first shell and a valve body removably received by said portion.

Claim 10

A pump assembly as in claim 5 including means for releasably clamping said arm in said first position.

Claim 11

A pump assembly as in claim 8 in which said arm is mounted on said shell for rotational movement and in which said interengageable means each comprise means forming a neck on a valve assembly and means forming a recess in an end of said arm for receiving said neck.

Claim 12

A pump assembly as in claim 9 in which said clamping means comprises a screw extending through said arm intermediate the ends thereof and into said shell.