Machine element or mechanism – Mechanical movements – Rotary to or from reciprocating or oscillating
Reexamination Certificate
2011-02-01
2011-02-01
Kramer, Devon C (Department: 3746)
Machine element or mechanism
Mechanical movements
Rotary to or from reciprocating or oscillating
C417S234000, C417S273000, C417S397000, C417S399000, C417S536000, C092S072000, C092S153000
Reexamination Certificate
active
07878081
ABSTRACT:
A portable, refrigerant recovery unit for transferring refrigerant from a refrigeration system to a storage tank. The recovery unit includes two, opposed piston heads rigidly attached to respective piston rods that extend along a common fixed axis. The piston rods are rigidly attached to the yoke member of a scotch yoke arrangement. In operation, incoming refrigerant from the system is simultaneously and continuously directed to the opposing piston heads wherein the forces of the pressurized refrigerant on them counterbalance or neutralize one another. The scotch yoke arrangement includes a two-piece slide mechanism mounted about a cylindrical crank pin and a single piston embodiment is additionally disclosed.
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Carson W. Scott
Kramer Devon C
Weinstein Leonard J
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