# US 4,628,574 A · Method for constructing an impeller assembly and shaft having interference fit

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 4,628,574 A
- Document ID: US4628574A
- Status: Granted
- Kind: A
- Application number: 06/608,630
- Filed: 1984-05-09
- Granted: 1986-12-16
- Earliest claimed: 1983-09-22
- Assignees: De Dietrich (USA), Inc.
- Inventors: Michael J. Lerman
- Web page: https://patentgrep.com/patent/US4628574A

## CPC

- B01F 27/071: {Fixing of the stirrer to the shaft}
- B01J 19/0066: {Stirrers (mixing per se B01F)}
- B01J 19/02: Apparatus characterised by being constructed of material selected for its chemically-resistant properties
- F16B 4/004: {Press fits, force fits, interference fits, i.e. fits without heat or chemical treatment (F16B4/002 takes precedence)}
- F16B 7/02: with conical parts
- F16D 1/092: the pair of conical mating surfaces being provided on the coupled hub and shaft
- B01J 2219/0209: of glass
- B01J 2219/0213: of enamel
- Y10T 29/4932: Turbomachine making
- Y10T 29/49321: Assembling individual fluid flow interacting members, e.g., blades, vanes, buckets, on rotary support member
- Y10T 29/49901: Sequentially associating parts on stationary aligning means
- Y10T 29/49945: by driven force fit
- Y10T 403/70: Interfitted members
- B01F: MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING (mixing paints B44D3/06)
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- F16B: DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING (couplings for transmitting rotation F16D)
- F16D: COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A shaft and an impeller assembly are connected together in an interference fitted connection. Both the shaft and impeller assembly are coated with a corrosion resistant material and the connection is created between the coated surfaces at a region of complementary tapers.

## Claims

### Claim 1

A method of connecting a shaft and at least a first and second impeller assembly, each of which are coated with a coating of corrosion resistant material throughout their entire exposed surfaces, through an interference fitted connection between coatings comprising providing a first region at one end of said shaft and at least a second region along said shaft, spaced from said first region, said first region of said shaft extending from said one end and both regions formed by a constant tapered surface, providing a tapered surface along a bore of a hub member of each impeller assembly which is complementary to at least a portion of the length of respective surfaces within said regions along said shaft, locating said tapered surfaces along a common axis, inserting said shaft end into said bore of a second impeller assembly, moving said shaft and impeller assembly in relative movement under an applied force, to locate said second impeller assembly in interference fitted connection within said second region and, then, inserting said shaft into said bore of said first impeller assembly and moving said shaft and impeller assembly in relative movement, also under an applied force, to locate said first impeller assembly in interference fitted connection within said first region.