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...During the Civil War, the Confederacy established its own Patent Office which issued 266 patents, a third of which concerned implements of war.
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| Number | Title | Issue Date |
| 8157028 | Masonry drill bit A masonry drill bit includes a cutting insert which is substantially roof-shaped in sideview and has on each side of its “roof” one lip. Each lip includes a leading cutting surface and a trailing free surface, wherein the mutually abutting free surfaces at the r... | 04/17/2012 |
| 8002054 | Roof drill bit, roof drill bit body and hard cutting insert for roof drill bit A roof drill bit has an elongate roof drill bit body, which has a forward end and a rearward end. The roof drill bit body contains a slot at the forward end. The roof drill bit body contains a dust port wherein the dust port has a central longitudinal dust axis. The... | 08/23/2011 |
| 7392866 | Roof drilling system improvements The invention is embodied in a heavy duty drill bit for hard/soft rock drilling comprising a high fatigue-resistant, high alloy steel bit body having a PCD cutter member and an enlarged shank portion constructed to accommodate torsional forces at high thrust pressur... | 07/01/2008 |
| 7320565 | Edge-carrying drill, method for the manufacture of the drill, and drilling tool comprising such a drill In a first aspect, the invention relates to an edge-carrying drill body (1) of the type that is intended for deep hole drilling, and which is rotatable around a geometric axis (C) as well as comprises a through channel (2) arranged for internal chip ev... | 01/22/2008 |
| 7228922 | Drill bit A drill bit has a pair of cutting teeth with cutting elements extending from a cutting end portion of the drill bit. Each cutting tooth extends radially, outwardly parallel to a longitudinal axis of the drill steel. The cutting teeth are juxtaposed with one another ... | 06/12/2007 |
| 7182556 | Drill and throwaway insert A drill improving the aligning accuracy of an insert and achieves a stable machining operation while maintaining the strength of the drill main body. The drill includes a drill main body rotatable about an axis, and a throwaway insert detachably attached to the dril... | 02/27/2007 |
| 7168511 | Rotary drill bit having cutting insert with a notch A rotary drill bit insert that includes an elongate body that is rotatable about a central axis wherein the elongate body has a pair of symmetrical halves symmetrical about the central axis. The elongate body contains a central notch disposed between the symmetric h... | 01/30/2007 |
| 7137461 | Masonry drilling tool A masonry or rock drilling tool suitable for use with a rotary hammer has a drilling head (4, 104) at a forward end of the tool. A forwardly extending cutting plate (6, 106) is fitted or formed on the drilling head (4, 104). First and second opp... | 11/21/2006 |
| 7100714 | Mine ceiling drill bit and blade A drill bit consists of a bit body having a forward end and a slot in the forward end to hold a hardened cutting blade. The bit body has a table near the center of the blade to reduce the speed at which the drill bores into hard material. The blade has a central slo... | 09/05/2006 |
| 7051822 | Drill bit and drill tip having a tip-locating structure A drill bit assembly includes a drill bit having a leading end to which a drill tip is bonded. The drill tip has a front cutting edge, a pair of side cutting edges, a rear end and a pair of parallel side walls extending between the respective edges. The leading end ... | 05/30/2006 |
| 6968912 | Drill blades for drill bit A drill bit consists of a bit body having a forward end and a slot in the forward end to hold a hardened cutting blade. The blade has a central slot extending into the forward end thereof such that the slot defines inner side wails and a bridge extending between the... | 11/29/2005 |
| 6959775 | Drill bit A drill comprising a shank part (11), which is adapted to be received in a drill holder of a drilling machine, and an opposite cutting end part (13). An intermediate fluted part (12) is provided, which defines at least one helical flute or chann... | 11/01/2005 |
| 6929079 | Drill bit cutter element having multiple cusps Cutter elements for use in rolling cones rock bits are disclosed having a crown that includes multiple, spaced-apart cusps for enhancing formation removal by creating overlapping Hertzian contact zones. The cusps may be partially dome-shaped, berm shaped or otherwis... | 08/16/2005 |
| 6915867 | Earth penetrating rotary drill bit with helical ports A drill bit that has a drill bit body with a side wall and opposite ends. A distal one of the opposite ends of the drill bit body receives a cutting insert. The drill bit body contains at least two helical debris ports in the side wall thereof. The drill bit body fu... | 07/12/2005 |
| 6868924 | Rock drill A rock drill including a helical shank and a drill head. The drill head has an end face pointing in a feed direction and at least one roof-shaped carbide cutting element on the end face of the rock drill. The carbide cutting element extends transversely across the d... | 03/22/2005 |
| 6817429 | Roof bit carbide blade A roof bit blade insert for use in mining and other associated applications. The blade defines two opposing faces, each having a leading end and a trailing end. The blade defines an indexed protrusion disposed at either or both of the leading and trailing ends of ea... | 11/16/2004 |
| 6742610 | Rock drill A rock drill (1) for rotary hammers or the like is proposed in which a conveying helix (3) having main and secondary webs (6 to 9) is used. In this case, the convexing helix (3) is run up to the front region of the drill head (2... | 06/01/2004 |
| 6702047 | Drill bit for drilling rock The drill bit is particularly suitable for drilling rock. An elongated shank carries at least one cutting insert at one end. Cutting edges are formed by adjoining flanks and rake faces which enclose a wedge angle γ. The rake faces, between marginal segme... | 03/09/2004 |
| 6684968 | Roof bit body and insert assembly A center vacuum rotary drill bit including a rotary drill bit body and an insert. The bottom surface of the slot has a projecting key that cooperates with a depression keyway of the insert. Generally vertical sidewall surfaces of a depression keyway and v... | 02/03/2004 |
| 6431295 | Rock drill A drill including a stem (2) having at least two discharge grooves (3,4) for discharging drilling dust and helically circumscribing the stem (2), a drill head (5) provided at an of the stem (2) opposite the end provided with the shank and having a plurali... | 08/13/2002 |
| 6405813 | Rock drill for drilling bores in reinforced concrete A drill including a stem (2,22) having at least one discharge groove (3) helically circumscribing the stem (2,22), and a drill head (4,24) provided at the end of the stem (2,22) opposite the end at which a shank is provided and having at least two hard me... | 06/18/2002 |
| 6354771 | Cutting or breaking tool as well as cutting insert for the latter A cutting insert for a cutting or breaking tool, which can be mounted in a tool holder that can be rotated about its longitudinal axis, especially for a lathe chisel, has an essentially conical tip, a transition region and a foot for connecting to a tool ... | 03/12/2002 |
| 6260638 | Rotatable cutting bit assembly with wedge-lock retention assembly A cutting bit has a bit body which has a forward end and a rearward end. The bit body contains a seat at the forward end thereof. The bit body contains a bore intersecting the seat wherein a bore wall defines the bore. A cutting insert is received by the ... | 07/17/2001 |
| 6260637 | Rock drill A rock drill which has a cutting tip of roof-shaped design at its front end is proposed. In order to achieve a reduction in the loading of the carbide cutting tip or an increased drilling capacity in particular in concrete, the flanks are subdivided into ... | 07/17/2001 |
| 6176332 | Rotatable cutting bit assembly with cutting inserts A rotatable cutting bit for penetrating an earth formation wherein the rotatable cutting bit includes an elongate bit body having a forward end and a rearward end. The bit body further defines a peripheral surface. The bit body has a first cutting insert ... | 01/23/2001 |
| 6151960 | Method of determining characteristics of a rotary drag-type drill bit A method of determining wear characteristics of a rotary drag-type drill bit comprises the steps of: determining the location and shape of a datum profile for the cutters on the bit body: determining the location and shape of a reference profile located i... | 11/28/2000 |
| 6145606 | Cutting insert for roof drill bit A rotatable cutting bit for engaging earth strata wherein the bit comprises an elongate bit body rotatable about a central longitudinal axis. The elongate body has an axially forward end and an axially rearward end. A cutting insert is affixed to the elon... | 11/14/2000 |
| 6032750 | Drilling tool having a drill bit with primary and secondary cutting edges Drilling tool with a drill head with an end face pointing in the feed direction and which has a main bit, which forms a drill point located in the drill axis and the bit is inclined on either side in a substantially roof-shaped manner and the tool has dri... | 03/07/2000 |
| 5996715 | Mine roof drill bit and cutting insert therefor A rotary roof mine bit for drilling holes in the roof of a mine, comprises a bit body and an insert mounted in the bit body. The insert is formed of a hard material such as carbide or diamond. A top surface of the insert comprises two top sections which i... | 12/07/1999 |
| 5996714 | Rotatable cutting bit assembly with wedge-lock retention assembly A cutting bit has a bit body which has a forward end and a rearward end. The bit body contains a seat at the forward end thereof. The bit body contains a bore intersecting the seat wherein a bore wall defines the bore. A cutting insert is received by the ... | 12/07/1999 |
| 5873423 | Frustum cutting bit arrangement A frustum cutting bit arrangement, including a shank portion for mounting in, and to be retained by, a rotary cutting tool body, the shank portion having an axis, an inner axial end, and an outer axial end. A head portion has an axis coincident with the s... | 02/23/1999 |
| 5829540 | Mine roof drill bit and cutting insert therefor A rotary roof mine bit for drilling holes in the roof of a mine, comprises a bit body and an insert mounted in the bit body. The insert is formed of a hard material such as carbide or diamond. A top surface of the insert comprises two top sections which i... | 11/03/1998 |
| 5535839 | Roof drill bit with radial domed PCD inserts A rotary drill bit having a head portion with at least two hard surfaced inserts having domed working surfaces and being oppositely oriented to face in the direction of rotation at positive rake angles, and a mounting adapter for removably securing the dr... | 07/16/1996 |
| 5499688 | PDC insert featuring side spiral wear pads The present disclosure sets forth various forms of inserts for operating as elements in bearing drill bits and similar devices. A single insert is formed with an external side face of cylindrical construction. One or more strips of hardened materials such... | 03/19/1996 |
| 5460232 | Rotary earth drill bit socket shield In a rotary earth drill in which sockets are welded to and spaced around a head and drill bits are removably mounted in the sockets, the sockets having a surface exposed to abrasion when the drill is rotated in the earth, a shield in the form of a shroud ... | 10/24/1995 |
| 5417475 | Tool comprised of a holder body and a hard insert and method of using same A breaking or excavating tool has a diamond and/or cubic boron nitride coated cutting insert mounted at the forward end of a tool body which is made of a softer material than the insert. A separately formed retaining member such as a washer, ring or sleev... | 05/23/1995 |
| 5400861 | Rotatable cutting bit assembly A roof drill bit assembly comprising a roof drill bit and a chuck. The roof bit contains a cavity which opens at the rearward end thereof. Upon assembling the bit and the chuck, the cavity receives the axially forward end of the chuck. A sealing member is... | 03/28/1995 |
| 5311959 | Mine tool roof bit insert A mine tool roof bit insert has two flat parallel sides extending in the long dimension of the insert and has two uppermost slanted surfaces extending between the two flat parallel sides. There is a trough at the top of the insert, which is between the tw... | 05/17/1994 |
| 5287937 | Drill bits and the blades therefor A drill bit is provided which has a novel blade having an elongate longitudinal protrusion positioned axially along the centerline of one side of the blade. The body is adapted to retain the blade in a transverse slot on one end of the body. The slot is p... | 02/22/1994 |
| 5269387 | Insert for mine roof tool bit This mine roof tool bit insert, formed from a flat elongated body, provides opposed side faces, opposed end faces, a bottom face, opposed top faces and opposed intermediate faces disposed between associated top faces and end faces, the body forming identi... | 12/14/1993 |
