Clamping chuck with integrated drawbar
AssigneeSystem 3R International AB
InventorErik Mellström
Life of this patent
Estimating the term…
Abstract
A clamping device for machine tools, comprising a chuck (1.1) and a drawbar (1.2) for clamping separate pallets (1.3), with a bayonet-connection via rotational motion of that drawbar (1.2). Rotational motion of the drawbar (1.2) is guided and determined by means (2.5, 2.7, 2.6, 2.4, 2.12, 3) provided in the chuck housing (2.3) interacting with the drawbar (1.2, 2.13). The drawbar (1.2) is turnable mounted in the chuck (1.1) to impede the drawbars extraction out of the chuck, independent if the drawbar (1.2) is in clamping or unclamped condition.
Claims16
A clamping device for machine tools, comprising:
- a chuck having x-y-reference elements and z-reference elements;
- and
- a drawbar for clamping a pallet to the chuck in a clamping condition having an unclamped condition, the chuck radially moving clamping balls for clamping the drawbar at a corresponding tapered portion of the drawbar and pulling the drawbar inwards, wherein:
- the drawbar possesses at least one projection for entering a form-locking connection with the separate pallet by a rotational motion of that drawbar;
- the chuck has an inner guidance channel in which the drawbar is loosely positioned;
- the chuck includes means for interacting with the drawbar for the rotational guided motion of the between the clamping condition and the unclamped condition;
- the drawbar is turnable journalled mounted in the inner guidance channel is form-locking designed with respect to the inner guidance channel and with respect of the chuck to impede the drawbar's extraction out of the chuck, when the drawbar is in the clamping condition and when the drawbar is in the unclamped condition.
A clamping device for clamping a pallet, the clamping device comprising:
- a chuck housing having an inner guidance channel;
- a drawbar for clamping a pallet to the chuck housing in a retracted clamping condition, the drawbar having an extended unclamped condition, the drawbar mounted in the inner guidance channel, the drawbar having at least one projection for entering a form-locking connection with the pallet by a rotational motion of the drawbar in the chuck housing;
- a piston, axially shiftable within the chuck housing and encircling the drawbar;
- and
- a plurality of clamping balls positioned to contact a tapered surface of the drawbar and a tapered surface of the piston during the axial shift of the piston.
Dependencies are inferred from the claim text.