# US 9,752,588 B2 · Molten metal impeller and shaft > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,752,588 B2 - Document ID: US9752588B2 - Status: Granted - Kind: B2 - Application number: 15/394,042 - Filed: 2016-12-29 - Published: 2017-07-06 - Granted: 2017-09-05 - Earliest claimed: 2015-12-30 - Applicants: Karl E. Greer - Inventors: Karl E. Greer - Web page: https://patentgrep.com/patent/US9752588B2 ## CPC - F04D 29/2277: {for increasing NPSH or dealing with liquids near boiling-point} - F04D 7/065: {for liquid metal} - F04D 29/2294: {for protection, e.g. against abrasion} - F04D 29/24: Vanes - F04D 29/426: {especially adapted for liquid pumps} - F04D: NON-POSITIVE-DISPLACEMENT PUMPS (engine fuel-injection pumps F02M; ion pumps H01J41/12; electrodynamic pumps H02K44/02) ## Abstract An assembly that includes an impeller having an upper face, a lower face, and a central bore sized and shaped to mate with a connecting end of a shaft. The central bore is defined by a plurality of ledges that each include a cement groove, and channels disposed between the ledges. The connecting end includes a plurality of slots, and extended grooves disposed between the slots. Each extended groove includes an end that extends perpendicular to the length of the extended groove. In application, the plurality of ledges frictionally communicate with the outer surface of the shaft. The plurality of channels of the impeller align with the plurality of grooves of the shaft defining passages that provide a tunnel for entrainment of particles entering the impeller. The cement grooves of the impeller further align with and receive the extended grooves and ends of the shaft resulting in a stronger connection between the shaft and impeller. ## Claims ### Claim 1 An impeller and shaft assembly comprising: a cylindrical impeller having a plurality of channels, and a shaft member having a connecting end that defines a plurality of concave surfaces that align with said channels, wherein said impeller defines a plurality of vanes that define stability points that are in frictional communication with an outer surface of said shaft member, and wherein said vanes further include cement grooves that align with said connecting end of said shaft member. ### Claim 2 (depends on 1) The assembly as recited in claim 1, wherein said impeller further includes a central bore, and wherein said connecting end passes through said central bore. ### Claim 3 (depends on 2) The assembly as recited in claim 2, wherein said connecting end includes a plurality of extended grooves that align with said cement grooves, and wherein a lower end of each of said extended grooves include a cavity. ### Claim 4 (depends on 3) The assembly as recited in claim 3, wherein said cavity is perpendicular to a length of said extended groove. ### Claim 5 (depends on 4) The assembly as recited in claim 4, wherein said plurality of channels are disposed between said plurality of vanes, and wherein each of said stability points is adjacent the vane and the channel. ### Claim 6 An impeller and shaft assembly comprising: a cylindrical impeller, and a shaft member having a connecting end, wherein said impeller defines a plurality of channels that align with concave surfaces of said connecting end, and wherein said impeller further defines at least one (1) cement groove that aligns with at least one extended groove of said connecting end, wherein said at least one cement groove aligns with said extended groove forming a chamber therebetween, and wherein at least one planar surface is defined adjacent each of said plurality of channels and are in frictional communication with an outer surface of said connecting end, and wherein passages are defined between said channels and said concave surfaces. ### Claim 7 (depends on 6) The assembly as recited in claim 6, wherein said cylindrical impeller further includes a lower face and a central bore, and wherein said central bore is sized to receive said connecting end. ### Claim 8 (depends on 7) The assembly as recited in claim 7, wherein said central bore includes a plurality of vanes having vane ends, and wherein each of said vane ends include said cement groove. ### Claim 9 (depends on 8) The assembly as recited in claim 8, wherein said central bore further includes a circular ledge adjacent said lower face. ### Claim 10 (depends on 9) The assembly as recited in claim 9, wherein said connecting end sized to frictionally pass through said circular ledge. ### Claim 11 (depends on 10) The assembly as recited in claim 10, wherein said passages are defined between an inside wall of each of said channels and said concave surfaces. ### Claim 12 (depends on 11) The assembly as recited in claim 11, wherein a lower end of said extended groove includes a cavity that is perpendicular to a length of said extended groove. ### Claim 13 (depends on 12) The assembly as recited in claim 12, wherein said inside wall joins with the upper face and extends downwardly to the lower face. ### Claim 14 (depends on 13) The assembly as recited in claim 13, wherein each of said plurality of concave surfaces downwardly extend an approximate length of said connecting end. ### Claim 15 (depends on 14) The assembly as recited in claim 14, wherein said impeller vane includes at least two (2) vanes. ### Claim 16 (depends on 15) The assembly as recited in claim 15, wherein a protective sleeve is in surrounding relationship to said mid-section. ### Claim 17 (depends on 12) The assembly as recited in claim 12, wherein said shaft member further defines at least one sleeve groove that vertically extends an approximate length of a defined mid-section of said shaft member. ### Claim 18 An impeller and shaft assembly comprising: a cylindrical impeller vane having an upper face, a lower face and a central bore that defines a height that extends from the upper face to the lower face, said central bore includes a plurality of vanes having vane ends that extend in perpendicular relation with said height and channels disposed between the plurality of vanes, and wherein each of said plurality of vanes define at least one planar surface adjacent the vane and the channel, and wherein each of said vane ends include a cement groove, and wherein said central bore further defines a circular ledge adjacent said lower face; a shaft member having a connecting end sized to frictionally pass through said circular ledge, a plurality of concave surfaces and extended grooves disposed on a surface between each of said plurality of concave surfaces, and wherein each of said extended grooves include a cavity that is perpendicular to the length of said extended groove; and wherein said channels align with said concave surfaces such that passages are defined between an inside wall of each of said channels and said concave surfaces; and wherein said cement grooves align with said extended grooves forming a chamber therebetween. ### Claim 19 (depends on 18) The assembly as recited in claim 18, wherein said cement groove is centrally disposed on said vane end. ### Claim 20 (depends on 19) The assembly as recited in claim 19, wherein each of said channels extend the height of said central bore.