US 4,196,805 AGranted

Anti-electrostatic charging conveyor roller made of a synthetic resin

OwnerHirokazu Bannoinventor

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Abstract

A roller made of a synthetic resin, used for supporting a conveyor belt, possesses an anti-electrostatic-charge capability. Utilizing insert-forming injection molding, a conveyor carrier roller body is integrally formed concentrically about a thin walled metallic housing containing a rotary bearing assembly therein at the innermost position for concentrically forming a conveyor carrier roller body integrally with the metallic housing. The inner race of the bearing is force-fitted onto the roller shaft and the outer race of the bearing is force-fitted inside the metallic housing. A roller of such a construction will readily discharge the static electricity charged on the surface of the roller by conducting it to ground through a snap ring (fitted in a circular groove formed inside of the boss portion of the roller), the housing, the bearing, and the shaft. The snap ring positioned adjacent the electricity charging place functions like a lightening conductor through the point-discharging.

Claims3

Dependent claims

A roller for use in supporting the conveyor belt in a belt-conveyor apparatus and being free of electrostatic charge build-up when in use, comprising:

a short shaft having on each end portion thereof a pivotable coupling means for connecting with the coupling means of the shaft of an adjacent roller when in use in such a manner as to allow relative rotation between rollers in one plane only;
a rotary bearing assembly, the inner race thereof being fitted onto the axially middle portion of said shaft;
a metallic housing of thin-walled cylindrical shape having an inwardly turned flange portion on one end thereof, the outer race of said bearing assembly being force-fitted inside said housing;
a roller body, made of rubber or synthetic resin, having a central boss portion with a circular groove therein, said housing being securely held inside said boss portion;
a metallic snap ring fitted into the circular groove of the central boss of said roller body, said snap ring being in contact, capable of conducting electricity therethrough, with said housing and securing the position of said bearing assembly in cooperation with the flange portion of said housing,
whereby said snap ring is electrically grounded by way of said housing, said bearing assembly and said shaft when the roller is in use.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 05/885,254Filed 10 Mar 1978
Priority: JP 52/161592[U]1 Dec 1977
Granted: 8 Apr 1980
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

B65G 43/00
Control devices
B65G 39/02
Rollers, e.g. drive rollers, or arrangements thereof incorporated in roller-ways or other types of mechanical conveyors: adaptations of individual…
B65G 39/04
Adaptations of individual rollers and supports therefor: the rollers comprising a number of roller forming elements mounted on a single axle
B65G 39/09
Adaptations of individual rollers and supports therefor: arrangements of bearing or sealing means