Positive Displacement Injection Pump
1 Assignment
0 Petitions
Accused Products
Abstract
A reciprocating drive mechanism having a housing with upper and lower internal chambers with a spool slidably positioned inside the upper internal chamber. There is at least one fluid inlet and fluid exhaust communicating with the upper internal chamber and at least one slide valve positioned within the upper internal chamber and traveling with the spool. A piston positioned in the lower internal chamber divides the lower internal chamber into an upper and lower cylinder space. A valve stem is connected to the piston and includes a bore communicating with the upper internal chamber and an exhaust passage is positioned between the upper and lower internal chambers.
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Citations
48 Claims
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1-34. -34. (canceled)
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35. A method of manufacturing a housing for a reciprocating mechanism comprising the steps of:
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a. providing a unitary section of material; b. boring an upper internal chamber in an upper portion of said material and a larger, lower internal chamber in a lower portion of said material; c. boring a first substantially vertical passage through a sidewall of said upper internal chamber and into said lower internal chamber; d. boring a second substantially vertical passage through a sidewall of said upper internal chamber; e. boring a third substantially vertical passage through a sidewall of said lower internal chamber; and f. boring a fourth substantially horizontal passage connecting said second and third vertical passages. - View Dependent Claims (36, 37, 38, 39, 40, 41)
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42. A reciprocating drive mechanism constructed by the process comprising the steps of:
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a. providing a unitary section of material; b. boring an upper internal chamber in an upper portion of said material and a larger, lower internal chamber in a lower portion of said material; c. boring a first substantially vertical passage through a sidewall of said upper internal chamber and into said lower internal chamber; d. boring a second substantially vertical passage through a sidewall of said upper internal chamber; e. boring a third substantially vertical passage through a sidewall of said lower internal chamber; and f. boring a fourth substantially horizontal passage connecting said second and third vertical passages. - View Dependent Claims (43, 44, 45, 46, 47, 48)
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Specification