Title: Holder for self-drilling dowels

Abstract: A holder for a self-drilling dowel has a frusto-conically shaped bore for holding the locking-in cone on the dowel. The surface of the bore has three uniformly angularly spaced rounded recesses so that three relatively narrow strips of the surface provide contact with the locking-in cone.

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Inventors: Udert, Karl-Ernst (Triesen, LI)
Entner, Josef (Frastanz, AT)

Application Number: 808727
Filing Date: 1977-06-21
Publication_date: 1979-01-16
Assignee: HILTI Aktiengesellschaft (Schaan, LI)
Primary Class(es): 279/103
Other Classes:
US Patent Ref:

1597404	Aug, 1926	Crossley	279/96.
2066276	Dec, 1936	Harrall et al.	279/43.
2359286	Oct, 1944	Billger	279/51.
2397382	Mar, 1946	Smith	279/102.
2399939	May, 1946	Phillips	279/19.
3049358	Aug, 1962	Polos	279/102.
3082014	Mar, 1963	Wohlhaupter et al.	279/103.
3100545	Aug, 1963	Zimmerman	279/96.
3534970	Oct, 1970	Glimpel	279/51.
3863940	Feb, 1975	Cummings	279/43.

Other Refs: 1049193

Sep, 1953	DE

Primary Examiner: Culver, Horace M.
Assistant Examiner:
Attorney: Toren, McGeady and Stanger