US 4,612,738 AGranted

Rotary flail cutting and finishing tool head

OwnerCharles B. Pittinger, Sr., Cynthia A. Pittingerinventors

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Abstract

A rotary cutting and finishing head of the flail type can use common commercially available sandpaper or emery cloth or other sheet material. A hub of the type rotatable by drill press or hand drill, mounts, in plane, uniform length and width strips or ribbons of any of these materials on slotted tube posts coaxially fixed to the hub. Each slot is of a size to capture a fixed end of a respective ribbon on assembly. In one version, every second post is provided with a ribbon. The ribbons are then wound in a substantially circumferential direction in and out among the posts, the odd posts being merely supports for the staggered partially overlying ribbons. On rotation of the hub at high speed, when the flail end of a ribbon wears from flexing at a post, it may part and release a fresh length or flail end at adjacent location. Alternately, fresh lengths of ribbon may be deployed manually by cutting off or tearing off worn flail portions. In another version, similar in part and that is preferred, a drop-in type ribbon supply is provided. Paint can be removed from soft aluminum as thin as 1/10 mm without distortion of the aluminum. An embodiment for wet operation is also disclosed, and a reversible live handle.

Claims2

Dependent claims

In a system for material working, of the type having:

a hub rotatable about an axis, a flexible linear member having a terminal length at a free end and an end secured for rotation with the hub, means including an array of spaced, secured supports disposed on the hub about the axis for swinging the terminal length of the flexible linear member in a plane about the axis on rotation of the hub and working material by contact of the flexible linear member with material to be worked, said contact causing wear of the flexible linear member, and means for causing wear to part said flexible linear member and to extend a further length thereof as a fresh working length during said rotation, a plurality of said flexible linear members adjacent and in said plane, each flexible linear member being a ribbon of sheet-like material, said ribbons being wound in a generally circumferential direction in-and-out among said array of supports, each of said ribbons being circumferentially staggered in relation to next adjacent said ribbons, the improvement comprising in combination:
a live handle on said axis for permitting steadying said ribbons against material to be worked, structure forming a hole in a circular plate, the live handle comprising a threaded tube with an enlarged portion forming opposed shoulders thereon, the enlarged portions and the shoulders being proportioned respectively for pressing against the margins of a structure forming the hole in said circular plate and for fitting within said hole, a rotatable handgrip on said tube in the form of a sleeve therearound, and means providing for the sleeve to be extended for use or to be recessed within said disk comprising the sleeve being smaller in diameter than said hole and the live handle being reversible on said axis for receiving the sleeve in the disk when not in use.

In a system for material working, of the type having:

a hub rotatable about an axis, a flexible linear member having a terminal length at a free end and an end secured for rotation with the hub, means including an array of spaced, secured supports disposed on the hub about the axis for swinging the terminal length of the flexible linear member in a plane about the axis on rotation of the hub and working material by contact of the flexible linear member with material to be worked, said contact causing wear of the flexible linear member, and means for causing wear to part said flexible linear member and to extend a further length thereof as a fresh working length during said rotation, the improvement comprising:
a plurality of said flexible linear members each being a ribbon of sheet-like material, said ribbons being wound in a generally circumferential direction in-and-out among said array of supports, each of said ribbons being circumferentially staggered in relation to next adjacent said ribbons, a live handle on said axis for permitting steadying said ribbons against material to be worked, means for cushioning contacts of the terminal lengths with material worked, including:
said ribbons being substantially the same size, a portion of each being overlain sufficiently loosely among the supports for centrifugal force of said rotation to cause intermediate parts of said ribbons to bulge outwardly between supports among which wound and yieldably back up said terminal ends, the securing of said supports including said supports comprising slotted tubes of circular cross-section, each slotted tube being of resilient material, with an end resiliently fitting a respective hole in the hub, a second array of posts being slotted and having circular cross-section and said means securing including a staple in each said ribbon and within a respective slotted post, structure forming a hole in a circular plate, the live handle comprising a threaded tube with an enlarged portion forming opposed shoulders thereon, the enlarged portion and the shoulders being proportioned respectively for pressing against the structure forming the hole in said circular plate and for fitting within the hole, a rotatable handgrip on said tube in the form of a sleeve therearound and means providing for the sleeve to be extended for use or to be recessed within said disk comprising the sleeve being smaller in diameter than said hole, and the live handle being reversible on said axis for recessing the sleeve within the disk when not in use.

Dependencies are inferred from the claim text.