Title: Adjustable boring bar provided with hard metal shifting tip for metal working

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Claims: What we claim is:

1. An adjustable boring bar for coarse and for fine machining comprising:

a boring bar shaft (1) connectable to a machine tool, the shaft having a cylindrical bore (1a) disposed at an angle with the geometrical axis of the boring bar shaft (1);

a boring head (2) disposed in said bore (1a) and including a shifting tip (13) disposed in an end of the boring head (2) and a cylindrical mantle receivable in the cylindrical bore (1a), said cylindrical mantle having a flattened portion (2a) which is parallel to the centerline of the boring head (2);

means mounting the boring head in the cylindrical bore (1a) of the boring bar shaft (1) for positioning and orienting edges of the shifting tip (13), including a first adjusting screw (3) for providing the force necessary for the fastening of the cylindrical mantle of the boring head (2) and further including a radial slot (1b) in the boring bar shaft (1), said slot (1b) extending from an end portion of the boring bar shaft (1) which points toward the workpiece and intersects the entire length of the cylindrical bore (1a) and wherein a portion of said screw (3) penetrates said bore (1a) in a chord-like fashion perpendicular to said slot (1b) and wherein said portion of said screw (3) is parallel to the flattened portion (2a) on the cylindrical mantle of the boring head (2);

a second adjusting screw (4) for coarse adjustment of the boring head (2) disposed in the mantle of the boring head (2) parallel to and displaced from the axis of said mantle, an end portion (4a) of said second adjusting screw (4) pointing outwardly from the mantle of the boring head; and

a dowel pin limiting member (7, 17) having one fixed end portion and the other end portion extending into the cylindrical bore (1a) and abutting against the end portion (4a) of the second adjusting screw (4).

2. The adjustable boring bar of claim 1 further comprising means mounting the limiting member (17) for fine adjustment of the boring head to a predetermined position in the direction of the axis (2b) of the boring head (2), said means including an aperture (16) communicating with the cylindrical bore (1a) with said limiting member (17) disposed within said aperture and a fine adjusting element (18) integral with said limiting member (17).

Other info:

Inventors: Szilva, Andras (Jaszbereny, HU)

Application Number: 573990
Filing Date: 1975-05-02
Publication_date: 1977-01-25
Assignee: Apritogepgyar (Jaszbereny, HU)
Primary Class(es): 408/153 407/45
Other Classes:
US Patent Ref:

2231469	Feb, 1941	Hassig	408/153.
2998736	Sep, 1961	Cloutier et al.	408/153.
3013450	Dec, 1961	Yogus	408/153.
3433104	Mar, 1969	Milewski et al.	408/156.
3704958	Dec, 1972	Gulibon et al.	408/153.
3801213	Apr, 1974	Eversole	408/185.

Other Refs: 228,863

Jun, 1960	AU

Primary Examiner: Vlachos, Leonidas
Assistant Examiner:
Attorney: