Drilling unit for stadium seats

Details Drilling unit for stadium seats Drilling unit for stadium seats

1976-06-14

1977-11-22

Hafer, Robert A.

Tool driving or impacting

With work engaging means supporting drive

Relatively adjustable work engaging elements

173 42, 173 38, 173 52, 408 53, E21C 900

Patent

active

040591620

ABSTRACT:
A drilling machine is disclosed for use in providing bolt holes in concrete stadium riser steps and the like. The drilling machine includes a relatively stationary base plate, and a foot plate slideable upon the base plate along a predetermined path. The foot plate carries drill mounting means for mounting a plurality of commercially available drills. An operating lever moves the foot plate, drill mounting device and drills toward and away from a vertical drilling face over the base plate.

REFERENCES:
patent: 965024 (1910-07-01), Secrist
patent: 1968892 (1934-08-01), Vonett et al.
patent: 2210628 (1940-08-01), Mantini
patent: 2764192 (1956-09-01), Poss
patent: 2788194 (1957-04-01), Hale
patent: 3025728 (1962-03-01), Cross et al.
patent: 3491809 (1970-01-01), Schneider
patent: 3559750 (1971-02-01), Mares
patent: 3718404 (1973-02-01), Grinnell et al.
patent: 3749507 (1973-07-01), Haley
patent: 3797363 (1974-03-01), Noheul

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