FR2641488A1 - Tool holder chuck which is an accessory for rotary hammer drills - Google Patents

Abstract

The invention relates to a tool holder accessory making it possible, by adding it to rotary hammer drills, to control precisely the cutting work in varied materials. It consists of a chuck 1 in which there rotates a spindle 6, the rear part 8 of which will be fixed to the drill which will transmit its rotary percussive movement to it. Only the percussive movement will be transmitted by the thrust bearing 4 to the tool which will be fixed in the housing 2, because the spindle 6 rotates freely in the chuck by virtue of the rolling-contact bearing 7 and of the thrust bearing 4. The device according to the invention is particularly intended for performing accurate cutting work by adding it to rotary hammer drills.

Description

 The present invention relates to a tool-carrying sleeve, accessory for rotary percussion punches; this invention is in the field of accessories for drilling machines.

 The percussion punches, animated simultaneously by a reciprocating reciprocating movement and a rotary movement, do not allow to master with sufficient precision the work of the tools that they deny.

The device according to the invention overcomes this disadvantage,
It adapts to the hammer drill in the same way as the tools which are usually intended for it. This device comprises, rotating freely inside a sleeve, a cylindrical axis of hard material, the rear end of which is shaped according to the mode of junction with the perforator so as to be fixed therein and to receive its rotary percussion movement, and the front end of which exclusively transmits the percussion to the tool holder via a stop on which it rests, while its free rotation in the sleeve prevents the transmission of the rotary movement to the tool.

 Thus, by holding the manohon with one hand, for static devices (or by assisted orientation fixing for larger devices), you can guide the tool attached to its end with the greatest precision, which works to like a jackhammer.

 This accessory allows you to perform the following precision work: t cutting in wood, plastic, stone, brick, concrete, tale; using the appropriate tools for the different materials (bird, chisel, point, gouge, etc.). The cut is clean from the start and can follow a specific line; in certain delicate materials to be drilled, holes of various shapes can be made without cracking.

 A model of this tool holder sleeve, actuated by a motorized machine equipped with a rotary percussion perforator, and provided with an assisted orientation allows, on attacking the cliffs and vertical walls, to uncoil large blocks with precision.

 According to a preferred embodiment, the front part of the sleeve is provided with a housing allowing the attachment of the tools. The hollow body of the sleeve contains and maintains the rotary axis which, thanks to one or more bearings or bearings, turns freely, transmitting only the percussion movement to the tool-carrying sleeve, that is to say, abutting the front of the hollow body of the manohon, either through a stop. The rear end of the rotary axis is intended to be fixed to drills or perforators to receive the rotary percussion movement.

 According to a variant, the front part of the tool holder sleeve can be machined so as to receive a drill chuck where the tools would be fixed.

The accompanying drawing illustrates the invention
The figure shows in section the device according to the invention.

 The device shown comprises a sleeve (1) made of hard and unbreakable material. At the front of the sleeve, a housing (2) allows the attachment of tools (chisel, chisel, point, gouge, etc.). The hollow body (3) of the sleeve houses in its front part a stop (4) against which the front end (5) of the rotary axis (6) bears. In the hollow body of the sleeve the rotary axis is held by the stop (4) and by the bearing (7) allowing it to rotate freely. The end of the rotary seat is adapted to the models of hammer drills or hammer drills to receive the movement.

 The device according to the invention is particularly intended for carrying out precision cutting work by adding it to rotary percussion punches.

Claims (5)

 1) Aceosory device with rotary percussion hammers allowing precision cutting of materials of various consistencies, characterized in that it comprises a sleeve (1) of hard and unbreakable material at the front of which a housing (2) allows fixing tools (bird, chisel, point, gouges etc.); the hollow body (3) of the sleeve houses in its front part a stop (4) against which the front end (5) of the rotary axis (6) is supported to directly transmit the percussion movement to the tools without the nty rotary movement is transmitted since the axis (6) rotates freely in the hollow body (3) of the sleeve, grfioe to the bearing (7) and to the stop (4). The rear part (8) of the rotary axis is designed to be fixed to the perforator and to receive the rotary percussion movement.  2) Device according to claim 1 characterized in that, instead of the housing (2), the front part of the tool holder manohon is machined so as to receive a drill chuck.  3) Device according to claim 1 or claim 2 oaraote- rise in oe that the front end (5) of the rotary axis is machined to abut directly against the front part (9) of the hollow body (3) of the sleeve.  4) Device according to any one of the preceding claims, characterized in that the rotary axis (6) rotates in the sleeve (1) held by one or more bearings or bearings.  5) Device according to any one of the preceding claims, characterized in that the tool-carrying sleeve (1) is equipped with less fixing suitable for the use of an assisted orientation, and more particularly when this sleeve is large dimensions (as, for example, as an accessory for vertical wall punches mounted on large machines).