Bizarre Patents
A method of swing on a swing is disclosed, in which a user positioned on a standard swing suspended by two chains from a substantially horizontal tree branch induces side to side motion by pulling alternately on one chain and then the other.
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| Number | Title | Issue Date |
| 6648341 | Chuck with helical jaw bite A chuck for use with a manual or powered driver having a rotatable drive shaft includes a generally cylindrical body having a nose section and a tail section. The tail section is configured to rotate with the drive shaft and the nose section has an axial ... | 11/18/2003 |
| 6126521 | Process and apparatus for manufacturing endodontic instruments An improved process for producing an endodontic instrument with a predetermined taper having a plurality of flutes, each with a predetermined number of spirals over a predetermined length of the instrument are provided. The process basically comprises pro... | 10/03/2000 |
| 6120364 | Grinding fixture and assembly A grinding fixture that allows a variety of helical shapes to be ground upon a variety of cutting inserts. The grinding fixture includes a bottom sine base for varying a first angle. A shaft is rotatably attached to the bottom sine base for providing rota... | 09/19/2000 |
| 5210980 | Diamond grinding machine for threading and forming hard materials such as ceramics, carbide and glass objects A versatile thread grinding machine includes a grinding wheel with concentric thread forms thereon, rotatable about a first axis, and a work spindle which is rotatable about a second axis. Both the angularity and distance between the axes may be varied. I... | 05/18/1993 |
| 5188491 | Method for cutting the flanks of an infeed worm and worm milling machine Feed screws are used for container filling machines in order to separate a series of approaching containers at a specific distance from each other. Feed screws for non-rotationally symmetrically shaped containers are milled with a milling tool rotating at... | 02/23/1993 |
| 5065549 | Method and apparatus for manufacturing K-files and reamers A process and apparatus for grinding the proper taper and all of the flutes with the correct number of spirals simultaneously in a single cycle of the grinding machine. This is accomplished by passing a rotating stock to produce the correct number of spir... | 11/19/1991 |
| 4999952 | Method and apparatus for manufacturing K-files and reamers A process and apparatus for grinding the proper taper and all of the flutes with the correct number of spirals simultaneously in a single cycle of the grinding machine. This is accomplished by passing a rotating stock to produce the correct number of spir... | 03/19/1991 |
| 4953325 | Thread grinding attachment A conventional cutting tool grinder is fitted with an attachment which imparts translational motion to the cutting tool grinder table in accordance with the pitch of a removable master threaded member. A crank drives a pulley linked to the master threaded... | 09/04/1990 |
| 4930265 | Thread grinding method and machine The cylindrical peripheral surface of a rotating workpiece is ground by a first section of a rotating grinding wheel while a second section of the grinding wheel is used to simultaneously grind a thread into the peripheral surface so that the reduction of... | 06/05/1990 |
| 4631870 | CNC grinding machine A CNC grinding machine includes a base having a first plane surface which can be defined by two axes perpendicular with each other, a work station driven by a first servomechanism to be capable of moving on the first plane surface and rotating about a thi... | 12/30/1986 |
| 4548000 | Method for producing threaded sections of threading tools The threaded portion of a tap drill is formed by mounting a tool blank for rotation about a longitudinal axis and mounting first and second grinding wheels integrally for rotation about a common second longitudinal axis parallel to the longitudinal axis o... | 10/22/1985 |
| 4484931 | Thread grinder A machine for grinding threads on a workpiece which is rotated in a workhead while the workhead is reciprocated by a table under a grinding wheel to form threads in the workpiece. To improve the accuracy with which the threads are formed, the workpiece an... | 11/27/1984 |
| 4408418 | Method of forming through-feed cylindrical thread rolling dies A cylindrical through-feed thread rolling die having a tapered lead-in portion, a cylindrical dwell portion, and a tapered exit portion is disclosed. Such die provides uniform spacing between the crests of the thread forms thereon throughout the lengths o... | 10/11/1983 |
| 4393624 | Thread grinder A machine for grinding threads on a workpiece which is rotated in a workhead while the workhead is reciprocated by a table under a grinding wheel to form threads in the workpiece. To improve the accuracy with which the threads are formed, the workpiece an... | 07/19/1983 |
| 4358911 | Machine for relief grinding tap threads A relief thread grinding machine for making screw taps wherein a workpiece 10 is clamped to a resiliently mounted body 5 of a longitudinally adjustable sled 1. The body carries a follower wheel 17 which bears on a cam roller 15 rotatably mounted on the sl... | 11/16/1982 |
| 4339894 | Convoluted shirring wheel An apparatus for shirring synthetic casings wherein there is superimposed on the customary helical shirring pattern another pattern which will change the folding or shirring pleat pattern of the casing from that of the customary continuous helix so as to ... | 07/20/1982 |
| 4142330 | Thread grinding machine A thread grinding machine comprising a headstock movable to-and-fro upon a machine frame. This to-and-fro movement is generated by a threaded rod driven by a spindle and transmission means and a rod member pivotably mounted at one end in a fixed adjustmen... | 03/06/1979 |
| 4052823 | Tap transport device A tap transport device is used in combination with a thread-cutting machine having a chuck adapted to hold a workpiece to be threaded and to rotate this workpiece about a threading axis. The tap transport device comprises a support frame adjacent the mach... | 10/11/1977 |
