Did You Know...
...that several people are credited with the invention of the flush toilet? Most people have heard of Thomas Crapper (1837-1910), the sanitary engineer who invented the valve-and-siphon arrangement that made the modern toilet possible. Another claimant to "the throne" was British inventor Alexander Cumming who patented a toilet in 1775. Then there's a nameless Minoan (a native of ancient Crete) who lived 4,000 years ago who supposedly was ahead of his time and created the first flush toilet!
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| Number | Title | Issue Date |
| 4285618 | Rotary milling cutter The milling cutter of the invention comprises a cutting section having a plurality of blades positioned on the surface and separated one from the other by flutes. At least two blades have one or more smooth segments, exhibiting an even and unbroken land a... | 08/25/1981 |
| 4265574 | Combined boring and milling tool A combined boring and milling tool has at least three triangularly shaped turnable cutter blades. The effective cutting edge of the first turnable cutter blade extends as bit (or drilling cutting edge) from the periphery of the shank at least to its axis.... | 05/05/1981 |
| 4265282 | Tubular rotating cutter A cutter for use on wood working tools such as for carving machines which is formed from a tubular segment cut along two planes which are nonparallel and nonperpendicular to the tube axis to provide cutting edges and adequate tool edge clearance, so that ... | 05/05/1981 |
| 4252480 | Throw away insert and end mills Improved throw away insert and end mills suitable for use with such an insert. The throw away insert has cutting edges which have a convex arcuate shape and have an identical radius of curvature larger than that of the circle circumscribing it at the nose... | 02/24/1981 |
| 4251172 | Cutting tool insert for precision radial machining A cutting tool insert for precision radial machining comprises two cutting faces and is adapted to be fitted in the strap of a tool holder. Said insert consists of two opposed identical frustoconical portions having a common circular base forming the medi... | 02/17/1981 |
| 4243348 | Tool holder A holder for a rotary metal cutter for use with a milling machine having a shouldered head portion, a cutter and a clamp member. The cutter is sandwiched between the clamp member and the shoulder of the head portion. Where it is desired that the cutter be... | 01/06/1981 |
| 4222446 | Cutter with cutter holder for disintegrating of material, particularly of rock A cutter element having a peripheral working surface and a frontal face, defining therebetween a cutting edge. The working surface of a cutter element is formed in the shape of a solid of rotation generated about a longitudinal axis. The axial section of ... | 09/16/1980 |
| 4222690 | Drill having cutting edges with the greatest curvature at the central portion thereof A drill comprising a pair of cutting edges extending from the center of rotation of the drill symmetrically with respect to the center and curved outwardly away from the direction of rotation of the drill with a greater curvature in the center portion tha... | 09/16/1980 |
| 4220429 | Indexable insert drill An indexable insert drill having a cylindrical body with two flutes and a cutting insert mounted at the end of each flute. The cutting inserts are mounted so that each presents a cutting edge of a length less than the radius of the drill with each edge be... | 09/02/1980 |
| 4190386 | Method of producing holes free of accretions in circuit boards made of plastic A method is disclosed for producing accretion-free holes with a diameter of less than 1.5 mm in circuit boards made of plastic. A hard metal drill is employed having a cylindrical chucking shank and a fluted twist section. A central axis of the twist sect... | 02/26/1980 |
| 4176992 | Numerically controlled milling with parabolic profile tools for surface smoothness An arrangement for machining surfaces with a numerically controlled tool in which the tool is provided with a parabolic profile to obtain a substantially smooth surface finish. The workpiece to be machined is moved relative to the cutting tool in substant... | 12/04/1979 |
| 4132493 | Ball end mill A single-toothed ball end mill provided with a cutting edge including a starting end, positioned near the center of rotation of the end mill and having an upright portion. The cutting edge is defined by a line curved outwardly in the direction of rotation... | 01/02/1979 |
| 4123186 | Tool for machining clay A milling tool for machining clay in the formation of clay models comprising a cutting portion with a sharp point adapted to be guided over the surface of a clay block to produce characteristic lines at a predetermined depth prior to removal of excess cla... | 10/31/1978 |
| 4116580 | All cutting edge drill An all cutting edge drill in which the cutting edges include the cutting edges across the point, at the shoulders between the point cutting edges and the side flute edges, and along the flute edges, all of which avoids local wear areas and gains higher su... | 09/26/1978 |
| 4115024 | Spade drill blade The present invention relates generally to a spade drill blade and more particularly to a spade drill blade which is adapted to be clamped in the clamp slit of a holder and which has side surfaces that bear against the wall of the bore to be of a raised s... | 09/19/1978 |
| 4060335 | Spade drill A spade drill is provided with a holder for a spade cutting blade which is clamped in a slot of the holder by means of a clamp screw. The spade cutting blade is essentially formed with a cutting surface coming to a central point and of the same shape as t... | 11/29/1977 |
| 4034452 | Router bit An improved router bit that has numerous advantages over conventional router bits; the bit of the present invention allowing chips to fall through quite readily, making a smoother cut and having other advantages; the bit having two or more flutes, one of ... | 07/12/1977 |
