Brushing – scrubbing – and general cleaning – Machines – With air blast or suction
Patent
1989-07-27
1991-01-15
Coe, Philip R.
Brushing, scrubbing, and general cleaning
Machines
With air blast or suction
285 7, 285376, 285401, A47L 902
Patent
active
049843303
ABSTRACT:
An arrangement for attaching a rigid vacuum conduit to a nozzle provides high rotational freedom between the nozzle and the rigid conduit while retaining a reasonable degree of airtightness between the conduit and the nozzle. In one form of the invention, the rigid vacuum conduit includes a coupling section of generally cylindrical form adapted to be received into an inlet opening of the nozzle. The coupling section includes a plurality of spaced grooves, each circumscribing the coupling section. The presence of the grooves reduces the frictional loading between the vacuum conduit and the inlet opening while providing a trap for dirt particles that would otherwise jam the vacuum conduit into fixed position in the nozzle. In a further version of the invention, the rigid vacuum conduit comprises metallic material. To reduce frictional loading between such metallic material and the inlet opening of the nozzle, an annular band of low friction material encircles a coupling section of the vacuum conduit. The annular band may comprise a nonmetallic material and may be formed of a pair of cooperating sections.
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Berfield Robert C.
Meland Ronald F.
Coe Philip R.
Shop-Vac Corporation
Spisich Mark
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