GB2059309A - Chucks for machine tools - Google Patents

Abstract

A chuck for machine tools, especially drilling machines, consists of a base member 10 for receiving the tool and clamping jaws, a divided threaded ring 13 and a clamping sleeve 15 rigidly connected to the ring 13. By rotating the clamping sleeve 15, the threaded ring 13 is also rotated whereupon the clamping jaws rigidly clamp the tool. The annular clamping sleeve 15 is formed from a rolled sheet metal portion with its abutting edges rigidly connected. The necessary cross-section to produce the required wall thickness of the sheet metal portion is produced by embossing the sheet metal portion before rolling. <IMAGE>

Description

SPECIFICATION A chuck for machine tools The invention originates from a chuck according to the type set forth in the main claim. It is known to produce the clamping sleeve of the chuck by a chipless operation on a tubular section. That is comparatively laborious and is also expensive in view of the waste involved.

Advantages of the invention As opposed to this, the arrangement in accordance with the invention comprising the characterising features of the main claim has the advantage that the clamping sleeve can be produced more cheaply than the corresponding part of the known chuck of the type referred to.

Drawing An embodiment of the invention is illustrated in the drawing. Figure 1 shows the drill chuck of a drilling machine in longitudinal section, Figure 2 is a sheet metal part for forming the clamping sleeve of the drill chuck according to Figure 1 and Figure 3 is a section through the sheet metal part according to Figure 2 taken along the line Ill-Ill.

Description of the embodiment The drill chuck consists of a substantially cylindrical base member 10 provided with a central bore 11 for the reception of a tool, for example a drill. Jaws (not shown) which are slidingly arranged in a plurality of inclined bores 12 in the base member 10, serve to rigidly clamp the tool. A radially divided threaded ring 13 is provided for displacing the jaws the ring having an internal screw thread 14 which engages in an external screw thread on the jaws. The threaded ring 13 is rigidly connected to a clamping sleeve 15, for example by radial upsetting by means of electromagnetic or mechanical deformation or by pressing on. The clamping sleeve 15 engages by a certain extent over the threaded ring 13 which has on its end a ring of teeth 16 into which a manually actuated pinion can be engaged for clamping the tool.The clamping sleeve 15 extends over the entire rear portion of the base member 10 and tightly seals the lattertogetherwith the adjusting device for the jaws.

A flat sheet metal portion 20 serves for forming the clamping sleeve 15 (Figure 2), the wall thickness of which is first of all shaped by an embossing tool according to operational requirements and is then rolled.

In so doing, a strengthened rim 21 (Figure 3) is produced for fixing the clamping sleeve 15 onto the threaded ring 13, a thin walled central section 22 is produced for increasing the path of the clamping jaws and a second strengthening rim 23 is formed as an abutment for a flange 24 (Figure 1) on the base member 10. During embossing or thereafter, a knurling is applied to the two raised end regions 25 and 26 (Figure 3) of the sheet metal part 20 and the central region 27 is provided with the type symbol thereupon, the sheet metal portion 20 is rolled into a sleeve where-upon the abutting edges 28 and 29 are connected to one another, for example by welding, folding or the like.

1. A chuck for machine tools, especially drilling machines, consisting of a base member for receiving the tool and the clamping jaws, a divided threaded ring and a clamping sleeve rigidly connected to the ring, characterised in that, the clamping sleeve consists of a rolled sheet metal portion the abutting edges of which are rigidly connected to one another by welding orfolding orthe like.

2. A chuck according to claim 1 characterised in that the sheet metal portion forming the clamping sleeve is provided, before the rolling, with a wall thickness shaping preferably produced by an embossing tool.

3. A chuck for machine tools substantially as herein described with reference to the accompanying drawings.

**WARNING** end of DESC field may overlap start of CLMS **.

Claims (3)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION A chuck for machine tools The invention originates from a chuck according to the type set forth in the main claim. It is known to produce the clamping sleeve of the chuck by a chipless operation on a tubular section. That is comparatively laborious and is also expensive in view of the waste involved. Advantages of the invention As opposed to this, the arrangement in accordance with the invention comprising the characterising features of the main claim has the advantage that the clamping sleeve can be produced more cheaply than the corresponding part of the known chuck of the type referred to. Drawing An embodiment of the invention is illustrated in the drawing. Figure 1 shows the drill chuck of a drilling machine in longitudinal section, Figure 2 is a sheet metal part for forming the clamping sleeve of the drill chuck according to Figure 1 and Figure 3 is a section through the sheet metal part according to Figure 2 taken along the line Ill-Ill. Description of the embodiment The drill chuck consists of a substantially cylindrical base member 10 provided with a central bore 11 for the reception of a tool, for example a drill. Jaws (not shown) which are slidingly arranged in a plurality of inclined bores 12 in the base member 10, serve to rigidly clamp the tool. A radially divided threaded ring 13 is provided for displacing the jaws the ring having an internal screw thread 14 which engages in an external screw thread on the jaws. The threaded ring 13 is rigidly connected to a clamping sleeve 15, for example by radial upsetting by means of electromagnetic or mechanical deformation or by pressing on. The clamping sleeve 15 engages by a certain extent over the threaded ring 13 which has on its end a ring of teeth 16 into which a manually actuated pinion can be engaged for clamping the tool.The clamping sleeve 15 extends over the entire rear portion of the base member 10 and tightly seals the lattertogetherwith the adjusting device for the jaws. A flat sheet metal portion 20 serves for forming the clamping sleeve 15 (Figure 2), the wall thickness of which is first of all shaped by an embossing tool according to operational requirements and is then rolled. In so doing, a strengthened rim 21 (Figure 3) is produced for fixing the clamping sleeve 15 onto the threaded ring 13, a thin walled central section 22 is produced for increasing the path of the clamping jaws and a second strengthening rim 23 is formed as an abutment for a flange 24 (Figure 1) on the base member 10. During embossing or thereafter, a knurling is applied to the two raised end regions 25 and 26 (Figure 3) of the sheet metal part 20 and the central region 27 is provided with the type symbol thereupon, the sheet metal portion 20 is rolled into a sleeve where-upon the abutting edges 28 and 29 are connected to one another, for example by welding, folding or the like. CLAIMS

1. A chuck for machine tools, especially drilling machines, consisting of a base member for receiving the tool and the clamping jaws, a divided threaded ring and a clamping sleeve rigidly connected to the ring, characterised in that, the clamping sleeve consists of a rolled sheet metal portion the abutting edges of which are rigidly connected to one another by welding orfolding orthe like.

2. A chuck according to claim 1 characterised in that the sheet metal portion forming the clamping sleeve is provided, before the rolling, with a wall thickness shaping preferably produced by an embossing tool.

3. A chuck for machine tools substantially as herein described with reference to the accompanying drawings.