Patent ID: 7001157

Claim:
A well pumping unit driven by a linear motor comprising: a) a slideway support operable to be mounted on a surface adjacent to a well head, said slideway support including: i) a first means for engaging and supporting an elongate flexible member, said first means mounted at an upper end of said slideway support; ii) a second means for engaging and supporting an elongate flexible member, said second means mounted at a lower end of said slideway support; and, iii) a third means for engaging and supporting an elongate flexible member, said third means mounted at the upper end of said slideway support and spaced from said first means, and b) a linear motor assembly supported by said slideway support, said linear motor assembly comprising: i) a motor complex primary and a motor complex secondary, said motor complex secondary operable to produce a field, said motor complex primary being complementarily manipulated by said field, said motor complex primary having an upper end and a lower end; ii) a first elongate flexible member, said first elongate flexible member having a first end fixed to said upper end of said motor complex primary, said first elongate flexible member passing over and supported by said first means for engaging and supporting an elongate flexible member, said first elongate flexible member having a second end operable to couple with an associated wellhead unit; and, iii) a second elongate flexible member, said second elongate flexible member having a first end fixed to said lower end of said motor complex primary, said second elongate flexible member passing under and supported by said second means for engaging and supporting an elongate flexible member, said second elongate flexible member passing over and supported by said third means for engaging and supporting an elongate flexible member, said second elongate flexible member having a second end operable to couple with a counterweight.