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A portable seat and platform support includes a shaft with a base mounted to its lower end to position the shaft to a generally vertical orientation. A removable platform can be attached to the upper end of the shaft, and a seat assembly is supported by a fastener assembly along the shaft for indepe

A portable seat and platform support includes a shaft with a base mounted to its lower end to position the shaft to a generally vertical orientation. A removable platform can be attached to the upper end of the shaft, and a seat assembly is supported by a fastener assembly along the shaft for independent rotation about the shaft axis. The seat assembly includes a collar slidably attached to the shaft, a seat supported by the collar, and a bearing on the collar. The fastener assembly includes an adjustment device to support the collar at a selected location along the shaft axis, and a bearing portion supported by the adjustment device and journaled to the bearing on the collar.

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1. Apparatus comprising:a substantially cylindrical shaft having a longitudinal axis, the shaft having an upper end and a lower end; a base mounted to the shaft at the lower end, the base being arranged to position the longitudinal axis to a generally vertical orientation; a platform removably attac

1. Apparatus comprising:a substantially cylindrical shaft having a longitudinal axis, the shaft having an upper end and a lower end; a base mounted to the shaft at the lower end, the base being arranged to position the longitudinal axis to a generally vertical orientation; a platform removably attached to the upper end of the shaft; a first collar slidably assembled to the shaft intermediate the base and the upper end; at least one seat assembly supported by the first collar, the seat assembly including: a seat arm supported by the first collar, and a seat supported by the seat arm distal from the first collar; a plurality of pin-receiving apertures in the shaft spaced along the longitudinal axis; and a pin receivable in a selected pin-receiving aperture to support the first collar at a selected location along the longitudinal axis so that the first collar is freely rotatable about the axis; and wherein the first collar includes a first bearing portion and the apparatus further includes: a bearing member coupled to the shaft by the pin, and a second bearing portion on the bearing member and journaled to the first bearing portion so that the seat assembly can rotate in the longitudinal axis. 2. The apparatus of claim 1, wherein the first collar is coupled to the shaft by the pin.3. Apparatus of claim 1, wherein the first bearing surface comprises a first substantially flat surface on the first collar substantially normal to the longitudinal axis, and the second bearing portion comprises a second substantially flat surface on the bearing member.4. Apparatus of claim 1, wherein the platform includes:a second collar mounted to the platform, the second collar having an opening receiving the upper end of the shaft, and a platform lock selectively locking the second collar to the shaft so that the platform and second collar may be removed from the shaft and the first collar may be thereupon removed over the upper end of the shaft. 5. Apparatus of claim 1, wherein the base is arranged to engage a support surface, and the shaft includes a cavity having an axial opening at the lower end, the apparatus further including:a stabilizing pin in the cavity arranged to extend through the opening to engage the support surface at a location aligned to the axis. 6. Apparatus of claim 5, further including a pin lock for locking the stabilizing pin to the shaft at a selected axial position.7. Apparatus of claim 1, wherein the seat arm includes a plurality of spaced apertures, and the seat includes a mounting pin for assembly to a selected one of the apertures to position the seat at a selected radial position distal from the shaft.8. Apparatus of claim 1, wherein the base includes:a housing having a plurality of leg receivers, a plurality of legs arranged to be attached to respective ones of the leg receivers, and a leg lock selectively locking each leg to the respective leg receiver so that the respective leg may be removed from the base. 9. Apparatus of claim 8, wherein the base is arranged to engage a support surface, and the shaft includes a cavity having an axial opening at the lower end, the assembly further including:a stabilizing pin in the cavity arranged to extend through the opening to engage the support surface at a location aligned to the axis. 10. Apparatus of claim 1, wherein the platform is a bench rest.11. Apparatus of claim 1, wherein the first collar includes a plurality of arm receivers, each arm receiver being arranged to receive a seat arm of a respective seat assembly.12. Apparatus of claim 11, wherein the platform includes:first and second platform members coupled by a hinge to form a table top, a second collar mounted to the first platform member, the second collar having an opening receiving the upper end of the shaft, and a platform lock selectively locking the second collar to the shaft so that the platform and second collar may be removed from the shaft and the first collar and seat assembly may be thereupon removed over the upper end of the shaft. 13. The apparatus of claim 12, wherein the platform further includes a rigid plate fastened to the first platform member and second collar, the plate supporting the second platform member when the second platform member is positioned relative to the first platform member to form the table top.14. Apparatus comprising:a shaft having a longitudinal axis, the shaft having an upper end and a lower end; a base mounted to the shaft at the lower end, the base being arranged to position the longitudinal axis to a generally vertical orientation; a platform removably attached to the upper end of the shaft; a first collar slidably assembled to the shaft intermediate the base and the upper end, the collar having a first bearing portion; at least one seat supported by the first collar; and a fastener assembly including: a bearing member attached to the shaft to support the first collar at a selected location along the longitudinal axis, and a second bearing portion on the bearing member and journaled to the first bearing portion so that the seat can rotate about the longitudinal axis. 15. Apparatus of claim 14, wherein the platform includes:a second collar mounted to the platform, the second collar having an opening receiving the upper end of the shaft, and a platform lock selectively locking the second collar to the shaft so that the platform and second collar may be removed from the shaft and the first collar may be thereupon removed over the upper end of the shaft. 16. Apparatus of claim 14, wherein the base is arranged to engage a support surface, and the shaft includes a cavity having an axial opening at the lower end, the assembly further including:a stabilizing pin in the cavity arranged to extend through the opening to engage the support surface at a location aligned to the axis. 17. Apparatus of claim 16, further including a pin lock for locking the stabilizing pin to the shaft at a selected axial position.18. Apparatus of claim 14, wherein the first collar includes a plurality of arm receivers, each arm receiver being arranged to receive a seat arm of a respective seat assembly is receivable in an arm receiver.19. Apparatus of claim 18, wherein the platform includes:first and second platform members coupled by a hinge to form a table top, a second collar mounted to the first platform member, the second collar having an opening receiving the upper end of the shaft, and a platform lock selectively locking the second collar to the shaft so that the platform and second collar may be removed from the shaft and the first collar and seat assembly may be thereupon removed over the upper end of the shaft. 20. The apparatus of claim 19, wherein the platform further includes a rigid plate fastened to the first platform member and second collar, the plate supporting the second platform member when the second platform member is positioned relative to the first platform member to form the table top.21. Apparatus comprising:a shaft having a longitudinal axis, the shaft having an upper end and a lower end; a base mounted to the shaft at the lower end, the base being arranged to position the longitudinal axis to a generally vertical orientation; a platform removably attached to the upper end of the shaft; a first collar slidably assembled to the shaft intermediate the base and the upper end, the first collar having a plurality of arm receivers; a plurality of seat assemblies removably supported by the first collar, each seat assembly comprising: a seat arm removably receivable in a respective arm receiver for support by the first collar, and a seat supported by the seat arm distal from the first collar; a plurality of pin-receiving apertures in the shaft spaced along the longitudinal axis; and a pin receivable in a selected pin-receiving aperture to support the first collar at a selected location along the longitudinal axis. 22. Apparatus of claim 21, wherein the platform includes:first and second platform members coupled by a hinge to form a table top, a second collar mounted to the first platform member, the second collar having an opening receiving the upper end of the shaft, and a platform lock selectively locking the second collar to the shaft so that the platform and second collar may be removed from the shaft and the first collar and seat assembly may be thereupon removed over the upper end of the shaft. 23. The apparatus of claim 21, wherein the pin locks the first collar to the shaft.