| Patents for B23B 51 - Tools for drilling machines (12,490) |
|---|
| 09/11/1991 | EP0445404A2 Device for making drilled holes with undercutting |
| 09/10/1991 | US5046902 Spiral drill |
| 09/04/1991 | EP0444776A1 Coupling device and method |
| 09/03/1991 | US5044841 Valve seat bushing machining apparatus |
| 09/03/1991 | US5044451 Device for forming an undercut in a drilled hole |
| 08/28/1991 | EP0443517A2 Throw-away tipped drill |
| 08/28/1991 | CN2083524U Rapid changeable return drill |
| 08/21/1991 | EP0442104A2 Device for drilling undercutted holes |
| 08/21/1991 | CN2083087U High torsional rigidity twist drill with shaped sections |
| 08/21/1991 | CN1053903A Cutting tool with twisted edge and manufacturing method thereof |
| 08/14/1991 | EP0441302A2 Throw-away tipped drill |
| 08/13/1991 | US5038642 Method of making drill with wear inserts |
| 08/13/1991 | US5038641 Drill with improved wear inserts |
| 08/08/1991 | DE4003506A1 Machining method by swarf removal - uses cutting edges at different feed rates and cutting speeds |
| 08/07/1991 | CA2009545A1 Method of countersinking and flaring an opening in a work piece and an apparatus therefor |
| 08/06/1991 | US5036928 Device for drilling an undercut in a borehole |
| 07/31/1991 | EP0357648B1 Torque-transmitting device for hand-held power tools |
| 07/30/1991 | US5035552 Twist drill for deep hole drilling |
| 07/30/1991 | US5035551 Method, chuck and rotary tool to be used when making a hole in a workpiece |
| 07/30/1991 | US5035550 Hole saw |
| 07/30/1991 | US5035548 Hole saw driver and extruder |
| 07/26/1991 | WO1991011283A1 Lateral cutter device |
| 07/26/1991 | CA2074731A1 Lateral cutter device |
| 07/25/1991 | WO1991010527A1 Bore-finishing tool |
| 07/25/1991 | WO1991010526A1 Bore-finishing tool |
| 07/23/1991 | CA1286510C Stick of composite materials and process for preparation thereof |
| 07/16/1991 | US5031709 Drilling apparatus for producing drilled holes having an undercut |
| 07/11/1991 | WO1991009698A1 Throw-away drill |
| 07/11/1991 | DE4000403A1 Werkzeug zur bearbeitung von bohrungen Tool for machining holes |
| 07/11/1991 | DE4000402A1 Werkzeug zur bearbeitung von bohrungen Tool for machining holes |
| 07/09/1991 | US5030042 Machining apparatus having means for changing radial position of cutting tools |
| 07/09/1991 | US5030040 Rotary cutter |
| 07/09/1991 | CA1285798C Groove point screw |
| 07/02/1991 | US5028057 Tool shaft for a tool of the percussive and rotative type |
| 07/02/1991 | CA1285403C Combination drilling and dressing bit |
| 06/26/1991 | CN2079544U Group twist drill capable of drilling deeply |
| 06/25/1991 | US5025871 Drilling method and rotary drill bit crown |
| 06/19/1991 | EP0432340A1 Drill and cutting insert therefor |
| 06/19/1991 | EP0432169A1 A device on manual machine tools for torque transmission. |
| 06/18/1991 | US5024566 Portable, electric |
| 06/18/1991 | US5023983 Device for producing mounting bores or valve bores in a wheel disk |
| 06/12/1991 | CN2078667U Deep hole drill for many kinds of steels |
| 06/11/1991 | US5022801 CVD diamond coated twist drills |
| 06/05/1991 | EP0429944A2 Tool receiving system |
| 06/04/1991 | US5020613 Device for cutting undercuts |
| 06/04/1991 | US5020394 Brazing |
| 05/28/1991 | USRE33598 Facing cutter |
| 05/28/1991 | US5018914 Chamfering tool |
| 05/23/1991 | DE3938244A1 Quick-change tool adaptor - is for portable drill or screwdriver and has drill fitted in adaptor with shank end entering quick-change chuck |
| 05/22/1991 | EP0428476A1 Tubular drill |
| 05/22/1991 | EP0427857A1 Drill |
| 05/16/1991 | WO1991006387A1 Twist drill |
| 05/14/1991 | US5015128 Rotary drill apparatus |
| 05/08/1991 | EP0425802A1 Drilling device with percussive and rotative tool |
| 05/08/1991 | DE3936747A1 Drill bit for PCB - has rear angled face at each end of front cutting edge |
| 05/01/1991 | CN2075996U Group twist drill |
| 04/30/1991 | US5011342 Twist drill |
| 04/18/1991 | DE4026603A1 Stepped spot weld drill bit - for partial drilling out of sheet spot welds |
| 04/16/1991 | US5007777 Hole saw |
| 04/03/1991 | EP0420602A2 Annular hole cutter |
| 04/03/1991 | EP0394444A4 Twist drill for making deep holes |
| 04/02/1991 | US5004384 Drill |
| 04/02/1991 | US5004382 Portable |
| 03/28/1991 | CA2026424A1 Annular hole cutter |
| 03/27/1991 | EP0418437A1 Boring tool |
| 03/27/1991 | CN1050154A Process for installation of expansion element |
| 03/26/1991 | US5001871 Machine for precision machining, with a rod for the determination of the practical mean axis of a hole of cylindrical general contour |
| 03/26/1991 | CA1282053C Borehole drill construction |
| 03/20/1991 | EP0417420A1 Method for the fitting of an expansion element |
| 03/20/1991 | EP0417302A1 Nitrogen-containing cermet |
| 03/20/1991 | CN1049992A Asymmetrical drill with double chip-removing slots |
| 03/19/1991 | US5000630 Bit for forming holes in composite materials |
| 03/19/1991 | US5000628 One step square hole drill bit |
| 03/19/1991 | US4999896 Automatic double-flush riveting |
| 03/14/1991 | DE3930250A1 Adaptor and core-bit and centre-hole bit - are attached to hand-operated electric drill spindle |
| 03/14/1991 | DE3930225A1 Offset twist drill for plastic printed circuit board mfr. - with curved front edge and cutting surface divided in two specified areas |
| 03/12/1991 | US4998981 Bit for drilling an undercut hole |
| 03/07/1991 | DE3928597A1 Tool for re-boring valve seats - has cutting insert discs with one or more flats, and central hole for fixing screw |
| 03/06/1991 | EP0415873A1 Bore undercutting tool |
| 03/05/1991 | US4997322 Use with hand drills |
| 02/28/1991 | DE3927615A1 Drilling holes in nickel-chromium alloy steel - involves high speed steel with dimensions defined by formula |
| 02/20/1991 | EP0413543A2 Abrasive body |
| 02/19/1991 | US4993894 Drill |
| 02/15/1991 | CA2023170A1 Abrasive body |
| 02/12/1991 | US4992010 Masonry |
| 02/12/1991 | US4992009 Sheet metal drill bit |
| 02/12/1991 | US4991467 Diamond twist drill blank |
| 02/06/1991 | CN2070652U Twist drill without crossedge |
| 02/05/1991 | US4989681 Drill bit for producing undercuts |
| 01/31/1991 | DE3924271A1 Drill bit with spiral thread - produces holes of greater dia. than drill chuck |
| 01/30/1991 | CN2070214U Composite drill |
| 01/24/1991 | DE3923504A1 Undercutting of holes in masonry - involves tool with adaptor which projects through facade |
| 01/24/1991 | DE3923162A1 Undercutting holes in masonry - involves tool with flange with spherical undersurface resting on spherical support |
| 01/23/1991 | EP0408860A1 Device for making an undercutting in a drilled hole |
| 01/22/1991 | US4986701 Process for manufacturing a cylindrical body and a device for carrying out the process |
| 01/22/1991 | CA1279212C Twist drill |
| 01/16/1991 | EP0408379A1 Improvements in drills |
| 01/16/1991 | CN1048516A Twist drill for deep hole drilling |
| 01/15/1991 | US4984944 Drill bit blade for masonry and rock drill |
| 01/15/1991 | US4984943 Drill with balanced inserts |