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...that after Walter Hunt patented the safety pin in 1849, he sold the rights to it for $400?
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| Number | Title | Issue Date |
| 4959519 | Controlled pressure butt welding process and apparatus for carrying it out In a pressure butt welding process, in particular for welding chain link bent from round wire, the influence of disturbing factors on the quality of the welding result is compensated by measuring the welding forces FK exerted on the workpiece b... | 09/25/1990 |
| 4542275 | Electrical chain welding machine A machine for electrical resistance welding of chain links has upsetting bars (10) which are engaged against the arcuate ends of a chain link (1). On either side of the welding zone the legs of a link are gripped by pairs of electrodes (12) attached to th... | 09/17/1985 |
| 4468553 | Automatic chain welding apparatus Welding of similar and dissimilar metals such as fine wires of gold, silver, brass and others to provide required strength without marring the surfaces of the link is accomplished by mounting an electrode (75,264) a selected distance from the surfaces to ... | 08/28/1984 |
| 4388513 | High voltage welding An electrode (75) disposed within an insulating sleeve (86) is placed adjacent a work piece (9) to provide a selected gap between the electrode and the work piece. The atmosphere between the electrode and the work piece is first ionized and then a welding... | 06/14/1983 |
| 4267421 | Apparatus for the successive welding of C-shaped, pre-bent, interlinked chain links Apparatus for the successive welding of C-shaped, pre-bent interlinked chain links forming a chain. The apparatus comprises a saddle for supporting a chain link to be welded, the saddle having a trough and cup-shaped recesses at each end of the trough for... | 05/12/1981 |
| 4211068 | Chain welding machine A chain welding machine has a first cam-operated linkage for rapidly moving psetting dies into and away from the ends of a link to be welded and a second hydromechanical linkage for applying upsetting force to the ends of the link. The upsetting force is c... | 07/08/1980 |
| 4149058 | Successive welding of immediately consecutive chain links For the successive welding to immediately consecutive links of a chain at a welding station, the chain is advanced to bring each link in turn to the welding station, the links flanking the link to be welded are positioned in a common plane perpendicular t... | 04/10/1979 |
| 4139982 | Chain welding machine This disclosure relates to a chain welding machine for the electric resisce pressure butt welding of a length of chain having interlinked chain links pre-bent into a C-shape. The machine comprises a pair of oppositely movable upsetting tools for engaging... | 02/20/1979 |
| 4133999 | Apparatus for the successive welding of consecutive chain links For the successive welding of the joints of consecutive links forming a link chain, the chain is advanced in a chain welding machine to bring a link to be welded directly below a welding position; the two links flanking the link to be welded are aligned i... | 01/09/1979 |
| 4075451 | Butt welding apparatus In the electric butt welding of a workpiece having rod-like ends, a force measuring device senses the pressing force exerted on the workpiece by the upsetting tools. The welding current is started upon command from the force measuring device when the pres... | 02/21/1978 |
| 4051667 | Chain welding machine A chain welding machine for the electrical resistance butt-welding of subntially C-shaped chain links is disclosed wherein two pair of electrodes are arranged symmetrically in relation to a median plane of the machine frame. Each pair of electrodes is su... | 10/04/1977 |
| 4012618 | Method and apparatus for the successive welding of consecutive chain links For the successive welding of the joints of consecutive links forming a link chain, the chain is advanced in a chain welding machine to bring a link to be welded directly below a welding position; the two links flanking the link to be welded are aligned i... | 03/15/1977 |
| 3977180 | Automatic chain manufacturing system An automated system for producing chain wherein individual pins are fed one-at-a-time to a heating station. The pins are heated in stages at said station to a temperature suitable for bending of the pins. The pins are automatically moved from said station... | 08/31/1976 |
| 3934407 | Method of and apparatus for producing particularly high-strength chains Method of and apparatus for electrically butt-welding high-strength chains. Previously bent and interengaged chain links are passed through a chain welding machine, each chain link in succession being alternately rotated about its axis and erected to a ve... | 01/27/1976 |
