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US 10,850,332 B1Granted
Hollow shank tool holder
AssigneeKennametal Inc.
InventorsAlan Bookheimer, Ruy Frota De Souza Filho
Life of this patent
Estimating the term…
Abstract
Hollow shank tool holders including stress reduction features that result in a more reliable stronger tool holder are disclosed. The tool holders include an elliptical undercut contoured relief surface adjacent to the clamping surface to substantially reduce or eliminate a stress point. The elliptical undercut allows for no changes to be made to the clamping surfaces of the tool holder.
Claims26
A hollow shank tool holder comprising:
- a taper shank portion structured and arranged to receive a clamping assembly of a spindle unit, the taper shank portion comprising:
- a mounting end having an opening, the opening defining a longitudinal axis of the hollow shank tool holder extending from the mounting end to a cutting end of hollow shank tool holder;
- and
- an inner peripheral surface, the inner peripheral surface comprising:
- a radially inwardly extending collar adjacent to the mounting end extending along the longitudinal axis from the opening;
- a radially inwardly tapered conical clamp retaining surface extending from the radially inwardly extending collar, the radially inwardly tapered conical clamp retaining surface structured and arranged to engage an opposing conical clamping surface of a clamping finger of a spindle unit;
- a contoured relief surface extending from the clamp retaining surface;
- and
- a radially outwardly tapered surface extending from the contoured relief surface tapered along the longitudinal axis toward the mounting end.
6 more elements
A hollow shank tool holder assembly comprising:
- a spindle unit comprising a clamping assembly comprising:
- a spindle, a draw bar and at least one clamping finger comprising a conical clamping surface;
- and
- a hollow shank tool holder comprising a taper shank portion structured and arranged to receive the clamping assembly of the spindle unit, the taper shank portion comprising:
- a mounting end having an opening, the opening defining a longitudinal axis of the hollow shank tool holder extending from the mounting end to a cutting end of hollow shank tool holder;
- and
- an inner peripheral surface, the inner peripheral surface comprising:
- a radially inwardly extending collar adjacent to the mounting end extending along the longitudinal axis from the opening;
- a radially inwardly tapered conical clamp retaining surface extending from the radially inwardly extending collar, the radially inwardly tapered conical clamp retaining surface structured and arranged to engage the conical clamping surface of the clamping finger of the spindle unit;
- a contoured relief surface extending from the clamp retaining surface;
- and
- a radially outwardly tapered surface extending from the contoured relief surface tapered along the longitudinal axis toward the mounting end.
9 more elements
A hollow shank tool holder comprising:
- a taper shank portion structured and arranged to receive a clamping assembly of a spindle unit, the taper shank portion comprising:
- a mounting end having an opening, the opening defining a longitudinal axis of the hollow shank tool holder extending from the mounting end to a cutting end of hollow shank tool holder;
- and
- an inner peripheral surface, the inner peripheral surface comprising:
- a radially inwardly extending collar adjacent to the mounting end extending along the longitudinal axis from the opening;
- a tapered clamp retaining surface extending from the radially inwardly extending collar;
- a contoured relief surface comprising an elliptical undercut extending from the clamp retaining surface, wherein a major axis of the elliptical undercut is at a radially inward tilt angle from the longitudinal axis of the hollow shank tool holder;
- and
- a radially outwardly tapered surface extending from the contoured relief surface tapered along the longitudinal axis toward the mounting end.
6 more elements
Dependencies are inferred from the claim text.