| Patents for B21H 3 - Making helical bodies or bodies having parts of helical shape (2,057) |
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| 05/03/1994 | US5308286 Device for manufacturing austenitic stainless steel drill screws |
| 05/03/1994 | US5308285 Method of making a bolt and washer assembly |
| 05/03/1994 | US5307662 Roll threading apparatus for threading end blank for metal drum container |
| 04/28/1994 | DE4236085A1 Radial roller head assembly - incorporates three rollers arranged in equilateral arrangement and there are three distance bolts equally spaced between them and extending between two bearing plates |
| 04/19/1994 | US5304024 Screw, method and rolling die for the production thereof |
| 03/31/1994 | WO1994006579A1 Screw conveyors, augers and flighting for use therein |
| 03/22/1994 | US5295774 Screw and method of making same |
| 03/15/1994 | US5293765 Method and apparatus for the manufacture of threaded aluminum containers |
| 03/09/1994 | CN2158313Y Machine for making external screw-threads |
| 01/05/1994 | CN2151826Y Universal hydraulic screw thread rolling machine |
| 12/29/1993 | CN2150943Y Effective three-position screw rolling machine |
| 12/09/1993 | WO1993024257A1 Method of making a threaded connection for reinforcing bars |
| 12/01/1993 | CN2147910Y Static workpiece type tapered thread rolling machine |
| 11/10/1993 | EP0569307A1 Device for forming helical fins on the external wall of tubes |
| 10/21/1993 | DE4307092A1 Wheel nut with integral flange - has concave flange face and is solid-shaped, e.g. by cold or hot-pressing and has clamping portion with tapering bore and slots |
| 10/21/1993 | DE4307091A1 Wheel nut with polygonal portion for spanner - has pressure plate solid-shaped by cold or hot-pressing and with concave face towards wheel |
| 10/21/1993 | DE4307090A1 Solid pressed wheel nut with bearing plate - has inner cone face and slots in clamping portion formed by pressing and inner thread formed by non-cutting process |
| 09/23/1993 | DE4206885A1 Bolt with self-locking thread effected by thread change - has enlarged flank angle between core dia. and thread dia. which is smaller than flank dia. |
| 09/22/1993 | EP0560789A1 Improved fixing. |
| 09/14/1993 | US5243843 Thread forming method and apparatus |
| 09/08/1993 | CN2141746Y Screw rolling machine |
| 09/08/1993 | CN2141745Y Hydraulic screw rolling machine |
| 09/07/1993 | US5242253 Thread-forming screw |
| 08/25/1993 | CN1075436A Roller for thread of cover plate billet of metal container |
| 07/29/1993 | DE4201746A1 Method of formation of grooves on extruded bars or tubes - by passing the tube or bar between toothed wheels whilst the material is soft |
| 07/28/1993 | EP0552713A1 Tool for rolling threads |
| 07/27/1993 | US5230235 Flat die thread roller |
| 06/16/1993 | CN2136085Y Rolling mill for lead screw |
| 05/19/1993 | EP0541803A1 Screw and thread rolling die |
| 05/05/1993 | CN2131630Y High-efficiency thread processing equipment |
| 04/20/1993 | US5203874 Device for securing dies on threading machines |
| 04/07/1993 | CN2129187Y 螺栓钢条 Bolt steel bars |
| 03/25/1993 | DE4131692A1 Cold rolling machine for rolling threads or other profiles - has fixed centre roll spindle and slide mounted roll spindle on each side of centre spindle forming two more stations |
| 03/24/1993 | EP0533456A2 Thread forming method and apparatus |
| 03/24/1993 | EP0532990A2 Self-tapping screw, method of its manufacture and rolling dies for carrying out the method |
| 02/24/1993 | CN2127328Y Thread rolling apparatus |
| 02/24/1993 | CN2127327Y Universal-purpose screw rolling machine |
| 02/16/1993 | US5186688 Cold working, passivation, aging |
| 02/02/1993 | US5182937 Seam-free thread rolling dies |
| 12/15/1992 | US5171186 Method of manufacture of a long point drill screw |
| 12/01/1992 | US5167136 Thread roll attachment |
| 11/18/1992 | CN2122016U Thread rolling plate for rolling non-round section screw arbor |
| 10/28/1992 | EP0510291A1 Method of and device for manufacture of threaded cans made of aluminium |
| 10/28/1992 | EP0199825B1 Method of manufacturing a self-drilling screw |
| 10/21/1992 | EP0509734A1 Method and apparatus forming a helical spline gear with a stopper on a rotary shaft |
| 10/07/1992 | EP0507474A1 method of manufacture of a long point drill screw |
| 10/07/1992 | CN2117961U Crank axis screw-threads rolling machine |
| 09/23/1992 | EP0504782A1 Screw, method and rolling die for manufacturing the same |
| 08/12/1992 | EP0498225A2 Flat die thread roller |
| 07/21/1992 | US5131250 Flat die thread roller |
| 06/25/1992 | WO1992010688A1 Improved fixing |
| 06/17/1992 | EP0490194A1 Screw with selfblocking thread |
| 05/07/1992 | DE4034795A1 Production of rolled internal screw thread - uses roller which is moved axially as it is rotated and which roller has external screw thread |
| 03/11/1992 | EP0473894A1 Threaded support |
| 02/18/1992 | US5088869 Thread rolling screw |
| 02/06/1992 | DE4024563A1 Round-headed screw mfr. with thread and stop - starts with cylindrical pin from which head and shank are pref. cold-rolled before thread cutting |
| 01/23/1992 | DE4123825A1 Concrete steel connection - is formed without muff with conical externally threaded section on one length engaging in corresponding hole in other length |
| 01/23/1992 | DE4022918A1 Self-locking screw connection - has screw, threaded pin and nut and has radial ridges on sides of thread pitch |
| 01/16/1992 | DE4022197A1 Prodn. of threads on workpiece using two rollers - has rollers of different dia. or of same dia. but rotating at different speeds |
| 01/14/1992 | WO1992001165A1 Screw, nut, and thread rolling die |
| 01/14/1992 | CA2087174A1 Screw, nut and thread rolling die |
| 01/07/1992 | CA1293845C Method and device for grooving the face of a cylindrical object |
| 12/31/1991 | US5076086 Thread rolling apparatus |
| 12/12/1991 | DE4113297A1 Former for cylindrical workpieces by rolling - has machine with adjuster for position and stroke of slide which carries roller |
| 10/23/1991 | CN2087108U Multi-working-position screw rolling machine |
| 10/08/1991 | US5054146 Anchor bolt |
| 10/02/1991 | CN2085686U Anti-theft special screw bolt and spanner |
| 09/04/1991 | CN2083970U Improved drill bit screw nail making machine |
| 05/22/1991 | EP0428317A2 Method and apparatus for manufacturing an anchor bolt |
| 04/02/1991 | US5003690 Finning and thread rolling machine |
| 03/21/1991 | DE3930131A1 Thread roller for thread rolling head - has cylindrical shoulder with marking for engraving |
| 03/20/1991 | EP0417416A2 Axial thread rolling head |
| 03/14/1991 | DE3929005A1 Support for screw thread rolling tool - incorporates dovetail groove to receive clamping strip |
| 03/12/1991 | US4998853 Self-drilling blind rivet and method for making same |
| 03/05/1991 | US4996860 Method and apparatus for manufacturing anchor bolts for concrete |
| 02/06/1991 | EP0411179A1 Thread rolling dies |
| 01/09/1991 | CN2068868U Threading roller |
| 12/11/1990 | CA1277519C Self-plugging blind fastener |
| 10/31/1990 | CN1010190B Rolling technology of twist drill rods |
| 10/24/1990 | EP0197129A4 Thread rolling and improved fastener |
| 10/24/1990 | CN1046299A Tools for rolling screw-threads |
| 10/04/1990 | DE3910265A1 Tool for thread rolling |
| 09/18/1990 | US4957401 Threaded fastener having minimized length and weight and method to make it |
| 09/11/1990 | US4955219 Rock bolt |
| 08/22/1990 | CN2060703U Reverse rolling contact roller for processing long screw thread |
| 08/02/1990 | DE3926000C1 Self-tapping screw mfd. by cold rolling - has specified ratio between outer and core dia. and between outer dia. and pitch |
| 08/01/1990 | EP0380005A1 Self-drilling blind rivet and method of making same |
| 07/31/1990 | CA1272006A1 Method and apparatus for making screws having a drill section and a reamer section |
| 07/26/1990 | DE4001723A1 Self drilling blind rivet - is made from cylinder blank with main body and bore |
| 07/25/1990 | CA2007523A1 Self-drilling blind rivet and method for making same |
| 07/24/1990 | US4942752 Apparatus for reforming and restoring the surface of a cylindrical workpiece manually |
| 07/17/1990 | US4941337 Method of making threaded fasteners |
| 05/30/1990 | CN1008205B Thread forming and improved fastener |
| 05/15/1990 | US4924687 Automatic screw machine |
| 03/07/1990 | CN1007046B Method for grinding roll |
| 03/01/1990 | DE3828446A1 Method of manufacturing self-tapping screws having a drill point |
| 01/24/1990 | EP0351465A1 Rock bolt |
| 01/18/1990 | DE3823834A1 Screw, in particular wood screw, process for producing the screw and apparatus for carrying out the process |
| 01/17/1990 | EP0351111A1 Method of making threaded fasteners |
| 11/21/1989 | US4881395 Process and apparatus for fabricating stepped nails |