# US 7,607,903 B2 · Stator tube removal and installation device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,607,903 B2 - Document ID: US7607903B2 - Status: Granted - Kind: B2 - Application number: 11/118,271 - Filed: 2005-04-29 - Published: 2005-09-01 - Granted: 2009-10-27 - Earliest claimed: 2001-11-30 - Assignees: Moyno, Inc. - Inventors: Michael Duane Amburgey - Web page: https://patentgrep.com/patent/US7607903B2 ## CPC - B23P 19/025: {For detaching only} - B25B 27/026: {fluid driven} - F04C 2/1075: {Construction of the stationary member} - F04C 2230/70: Disassembly methods - Y10T 29/49233: Repairing, converting, servicing or salvaging - Y10T 29/49236: Fluid pump or compressor making - Y10T 29/49238: Repairing, converting, servicing or salvaging - Y10T 29/49242: Screw or gear type, e.g., Moineau type - Y10T 29/53796: Puller or pusher means, contained force multiplying operator - Y10T 29/5383: having fluid operator - Y10T 29/53917: Tube with tube - B23P: METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS (arrangements for copying or controlling B23Q) - B25B: TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING, OR HOLDING - F04C: ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS (engines F03C); ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract An apparatus for removing a stator tube from a position about a rotor of a progressing cavity pump is provided. The apparatus includes an actuator assembly having a base and a piston which is longitudinally displaceable relative to the base, and a pusher rod. The base of the actuator assembly is removably attachable to a discharge end of the stator tube. The pusher rod is longitudinally releasably attachable to the piston at a plurality of locations along the length of the pusher rod and is located to engage the rotor when the base is coupled to the stator tube. The pusher rod is coupled to the piston and the piston is driven by the actuator assembly. With only slight modifications the apparatus may also be used to install the stator tube on the rotor when operated in a substantially opposite way. ## Claims ### Claim 1 A pump assembly comprising: an assembly/disassembly apparatus including an actuator assembly including a base and a piston which is displaceable relative to said base along a first axis, said base being removably attachable to a discharge end of a stator tube and a generally flexible tension member located adjacent to said piston and being releasably attachable to said piston at a plurality of locations along said tension member for movement along said first axis, said tension member being located and configured to be flexibly releasably attached to a rotor when said base is coupled to said stator tube, said tension member is coupled to said piston and said piston is driven by said actuator assembly. ### Claim 2 (depends on 1) The assembly of claim 1 further comprising a progressing cavity pump including a stator tube having a discharge end, said stator tube having a double lead helical cavity therein, said pump including said rotor in the form of a single lead helical screw rotor received in said stator tube, the rotor being rotatable relative to said stator tube to pump material through said stator tube. ### Claim 3 (depends on 2) The assembly of claim 2 wherein said tension member is releasably attached to said rotor. ### Claim 4 (depends on 2) The assembly of claim 2 wherein said tension member is releasably attached to said rotor such that tension forces applied to said tension member are transmitted to said rotor. ### Claim 5 (depends on 2) The assembly of claim 2 wherein said tension member is flexibly releasably attached to said rotor. ### Claim 6 (depends on 2) The assembly of claim 2 wherein said base is removably attached to said discharge end of said stator tube and said tension member is flexibly releasably attached to said rotor. ### Claim 7 (depends on 1) The assembly of claim 1, wherein said tension member includes a rod. ### Claim 8 (depends on 1) The assembly of claim 1, wherein said tension member is a chain. ### Claim 9 (depends on 8) The assembly of claim 8, wherein the apparatus further includes a clip having a slot therein for receiving a link of said chain, said clip having an outer dimension that is larger than an outer dimension of said piston and being removably located adjacent to an end of said piston. ### Claim 10 (depends on 1) The assembly of claim 1, wherein said piston is a hollow cylinder, said tension member is received in said piston, and said actuator assembly includes a hydraulic cylinder assembly. ### Claim 11 (depends on 1) The assembly of claim 1 where said tension member is located and configured such that when said tension member is flexibly releasably attached to a rotor when said base is coupled to said stator tube, and said tension member is coupled to said piston and said piston is driven by said actuator assembly, said tension member is placed in a state of tension. ### Claim 12 (depends on 1) The assembly of claim 1 wherein said tension member is in a state of tension. ### Claim 13 An assembly comprising: an assembly/disassembly apparatus including an actuator assembly including a base and a piston which is displaceable relative to said base along a first axis, said base being engageable with a discharge end of a stator tube, the assembly/disassembly apparatus further including a tension member that is releasably attachable to said piston at a plurality of locations along a length of said tension member such that displacement of said piston along said first axis causes displacement of said tension member along said first axis, said tension member being located and configured to be releasably attached to a rotor when said base is coupled to said stator tube, said tension member is coupled to said piston and said piston is driven by said actuator assembly to thereby cause said rotor and stator to move relative to each other along said first axis. ### Claim 14 (depends on 13) The assembly of claim 13 wherein said tension member is generally flexible. ### Claim 15 (depends on 13) The assembly of claim 13 wherein said tension member is located and configured to be flexibly releasably attached to a rotor when said base is coupled to said stator tube, said tension member is coupled to said piston and said piston is driven by said actuator assembly. ### Claim 16 (depends on 13) The assembly of claim 13 further comprising a progressing cavity pump including a stator tube having a discharge end, said stator tube having a double lead helical cavity therein, said pump including said rotor in the form of a single lead helical screw rotor received in said stator tube, the rotor being rotatable relative to said stator tube to pump material through said stator tube. ### Claim 17 (depends on 16) The assembly of claim 16 wherein said tension member is releasably attached to said rotor and in a state of tension. ### Claim 18 (depends on 16) The assembly of claim 16 wherein said tension member is releasably attached to said rotor such that tension forces applied to said tension member are transmitted to said rotor. ### Claim 19 (depends on 13) The assembly of claim 13 wherein at least part of said tension member constitutes a rod or a chain. ### Claim 20 (depends on 13) The assembly of claim 13 wherein said piston is a hollow cylinder, said tension member is received in said piston, and said actuator assembly includes a hydraulic cylinder assembly.