LOW ELECTROSTATIC DISCHARGE CONVEYOR

Title:

LOW ELECTROSTATIC DISCHARGE CONVEYOR

Document Type and Number:

WIPO Patent Application WO2000006470

Kind Code:

A3

Abstract:

A conveyor (20, 120, 220, 320) for transporting objects sensitive to electrostatic discharge. In one embodiment, the present invention relates to a slippable roller conveyor (20, 120, 220, 320) with conductive slippable rollers (30, 30') in electrical communication with an electrical ground (60). The slippable rollers (30, 30') preferably have about 10<5> ohms resistance from the outer surface (40) to the inner diameter (34) to ensure that electrostatic charges built up on the conveyed object can flow to ground, yet not flow too quickly. In another embodiment, the roller shafts (35) are supported on highly conductive bushings that provide a path to electrical ground that is preferably less than 10<4> ohms. In yet another embodiment, the roller shafts (35) are driven by a conductive pulley (65) that minimizes the build-up of electrostatic charge as a result of a triboelectric effect with the drive belt (70).

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Inventors:

HART STEVEN L (US)
HOWARD BRENT R (US)
DAENZER KLAUS P (US)

Application Number:

PCT/US1999/017184

Publication Date:

April 27, 2000

Filing Date:

July 29, 1999

Export Citation:

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Assignee:

SHUTTLEWORTH INC (US)
HART STEVEN L (US)
HOWARD BRENT R (US)
DAENZER KLAUS P (US)

International Classes:

B65G13/071; B65G43/00; B65G47/26; (IPC1-7): B65G47/00

Foreign References:

US3902301A	1975-09-02
US4520917A	1985-06-04
US4678178A	1987-07-07

Other References: