Title: Screw, screwdriver and screw-holding attachment therefor

Abstract: A screwdriver has an undercut enlarged foot portion and an anti-shift pivot element of one-piece therewith. The screwdriver is longitudinally inserted into a screw such that the foot portion and the pivot element are respectively received with clearance in an undercut slot and a central cavity formed in the screw head. Rotation of the screwdriver about the pivot element causes the foot portion to slide partially underneath and grippingly engage the side walls of the slot. A screwholding attachment is adjustable in fine, continuous manner relative to the screwdriver.

Do you think this is a good invention? Vote now:

Votes so far: For:(0) Against:(0)
Other info:

Inventors: Colognori, Aldo (Cliffside Park, NJ, US)

Application Number: 945811
Filing Date: 1978-09-26
Publication_date: 1980-02-26
Assignee: Zuppichin; Sebastian (Cliffside Park, NJ); Colognori; Aldo (Cliffside, NJ)
Primary Class(es): 81/453 81/436, 411/406, 411/407
Other Classes:
US Patent Ref:

914174	Mar, 1909	North	145/52.
942742	Dec, 1909	Presson	145/52.
1889330	Nov, 1932	Humes et al.	145/52.
1925385	Sep, 1933	Humes et al.	145/52.
2579438	Dec, 1951	Longfellow	145/50.
2902071	Sep, 1959	La Pointe et al.	145/52.
2905215	Sep, 1959	Hlynsky	145/52.

Other Refs: 126612106123628605230882338412710062369415

Feb, 1948	AU
Aug, 1880	DE2
Nov, 1922	DE2
Apr, 1931	DE2
Aug, 1977	FR
Jun, 1966	IT
Jun, 1963	CH

Primary Examiner: Simpson, Othell M.
Assistant Examiner: Zatarga, J. T.
Attorney: Kirschstein, Kirschstein, Ottinger & Cobrin