Joints and connections – Articulated members – Including static joint
Reexamination Certificate
2001-02-28
2003-03-18
Novosad, Christopher J. (Department: 3671)
Joints and connections
Articulated members
Including static joint
C403S376000, C403S408100, C074S57900F, C074S595000
Reexamination Certificate
active
06533488
ABSTRACT:
BACKGROUND OF THE INVENTION
Airless sprayers using electric motors have been known and used by contractors for many years. While such units have proven satisfactory, it is always an object of manufacturers of such devices to be able to produce such which are both more reliable and at the same time easier and less expensive to manufacture.
SUMMARY OF THE INVENTION
It is therefore an object of this invention to provide an airless sprayer drive mechanism which may be inexpensively manufactured and yet which exhibits a high degree of reliability.
Towards this end, the drive train is comprised of a motor having an output gear thereon which drives a combination gear assembly comprised of two gears mounted on a shaft which in turn drives a crank assembly which is comprised of a one-piece eccentric end gear molded together and mounted on a shaft which is supported at both ends to prevent cantilevering and attendant stresses. The crank assembly is offset from the vertical axis of the displacement pump in order to reduce side-loading thereon.
A connecting rod is mounted via a pin directly to the top of the displacement rod of the reciprocating pump. Retainer pin clippingly retains the pin in the connecting rod and enables the pin to be removed for servicing without the use of tools other than potentially a screwdriver or other generic tool.
REFERENCES:
patent: 3829242 (1974-08-01), Duke et al.
patent: 4253804 (1981-03-01), Vanderjagt
patent: 5375625 (1994-12-01), Reynolds
patent: 5988135 (1999-11-01), Moorman et al.
patent: 5992708 (1999-11-01), Gaichuk
Blenkush William M.
Kapelevich Alexander L.
Farrow Douglas B.
Graco Inc.
Novosad Christopher J.
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