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An aircraft having vertical takeoff and landing capability provided with at least first and second laterally extending paddle wheels rotatable on a central axis perpendicular to the longitudinal axis of the aircraft fuselage and between its nose and tail.
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| Number | Title | Issue Date |
| 7114413 | Portable band saw sharpener The portable band saw sharpener includes a frame for receiving a saw blade that is to be sharpened. A hand-operated motor is pivotally mounted to the frame for driving a grinding wheel, which engages the teeth of the saw blade. A hand-operated structure releasably h... | 10/03/2006 |
| 6907809 | Positioning device for saw blades A saw blade positioning device has two drive mechanisms and two guidance devices, which are preferably oriented at right angles in respect to each other. If a first guidance device is oriented in the radial direction of the circular saw blade by the linear guides, a... | 06/21/2005 |
| 6631658 | Saw sharpening machine with pitch pre-measurement and feedback control for saw blade indexing A band saw profiling machine includes an indexing mechanism having a feed finger mechanically linked to a caliper finger for reciprocating movement therewith. The caliper finger is urged toward the feed finger during an indexing movement of the indexing m... | 10/14/2003 |
| 6109137 | Machine for machining workpieces with cutting teeth, in particular saw blades A pivot body (22) mounted on a machine bed (20) so as to be capable of swinging defines a lift axis (D) which extends transversely of its own pivot axis (A) and along which a reciprocating slide (24) is movable. Infeed of a saddle (26) on the reciprocatin... | 08/29/2000 |
| 5759092 | Apparatus for sharpening circular saw teeth An apparatus for sharpening the teeth of a circular saw comprises a rocking arm with a pawl to engage and actuate the teeth of an indexing ratchet wheel which is mounted coaxially with the circular saw for synchronous clockwise indexing, and a grinding wh... | 06/02/1998 |
| 5503046 | Bandsaw indexing apparatus An indexing system for use in a bandsaw sharpening machine which includes at least one grinding wheel for engaging the teeth of a bandsaw blade. An indexing block slideably disposed with respect to the bandsaw blade end has a pawl for engaging the blade t... | 04/02/1996 |
| 5333518 | Saw blade sharpening apparatus A saw blade sharpening apparatus for sharpening an elongated blade having a plurality of aligned cutting teeth. The apparatus includes a grinder mechanism to sharpen the teeth. The grinder includes a body and a rotating grindstone, the grindstone having a... | 08/02/1994 |
| 5257563 | Apparatus for sharpening saw blades A sharpening apparatus (10) is disclosed. The apparatus (10) has a pivot arm (18) for pivotal movement about shaft (21) extending transversely of the apparatus. The location of shaft (21) is variable to suit a variety of hook angles of the blade (33)... | 11/02/1993 |
| 5117713 | Arrangement in automatic saw chain grinders An arrangement in automatic saw chain grinders of the kind which includes a mechanism (30, 47) for feeding the cutter links (36) of a saw chain (22) to be ground to a predetermined grinding location on a chain support (14), and also a movable grinding mac... | 06/02/1992 |
| 5078029 | Face and top grinder A grinding machine for sharpening toothed saws includes a saw blade holder for rotatably holding a saw. A pneumatic or hydraulic ram drives a cam back and forth in one of a number of preselected grooves in a rotatable cam plate for driving a pawl in an ar... | 01/07/1992 |
| 5048236 | Saw blade tooth grinder for saws A device for grinding saw blades, both hand saws and circular saws so that a predetermined tooth profile is obtained, utilizes a grinding head that moves in one plane and moves the saw in a second plane. The device comprises a saw blade mount, an indexing... | 09/17/1991 |
| 4699026 | Apparatus for sharpening chain saw chains A chain of a chain saw whose teeth are to be sharpened is mounted in a track (4) of a support table so that it can be indexed to a central cutting station whereupon a ram (12) will be acuated to reduce the width of the track (4) and grip the chain. A cutt... | 10/13/1987 |
| 4677882 | Feeding means for intermittently rotating a circular saw blade of great pitch A saw blade supported on a slip-on arbor has a pitch which is greater than the maximum possible stroke of the feeding means. For this reason each individual tooth of the saw blade is pushed in two successive forward strokes, first into an intermediate pos... | 07/07/1987 |
| 4488458 | Apparatus for advancing a saw blade in a machine for working on saws A controllable linear drive means (32) is pivotable about a first pivot axis (B) in parallel with the axis (A) of a saw blade (10). A pawl carrier (22) which carries a feed pawl (26) is reciprocable by the linear drive means (32) in circumferential direct... | 12/18/1984 |
| 4463499 | Portable chain saw sharpening kit with depth gauge filing attachment An attachment is provided for allowing a chain saw sharpener to be used for filing the depth gauge portions of the cutting links on the saw chain. The sharpener is of the type comprising a sharpener body in the form of an inverted U-shaped channel-definin... | 08/07/1984 |
| 4449427 | Machine for machining circular saw blades The invention relates to apparatus for machining circular saw blades and more particularly to the transport means for conveying workpieces to the machining stations of the apparatus. In accordance with the invention, the storage capability of the apparatu... | 05/22/1984 |
| 4434683 | Saw-advancing means with edge engaging pad Saw-advancing apparatus in a grinder for circular saws which includes a pad brought into engagement with the edge of the saw by extension of a fluid-operated ram. The pad and ram are swung as a unit to produce rotation of a saw engaged by the pad.... | 03/06/1984 |
| 4418589 | Method and apparatus for automatically facing saw blades having varying configurations of teeth A method and apparatus for automatically facing saws is described in which a saw blade is held over a spindle by a pair of electromagnets. A pawl engages successive gullets between saw blade teeth in order to index the saw blade. A grinding head mounted o... | 12/06/1983 |
| 4357841 | Automatic grinding attachment for saw grinders Apparatus for converting a manually operated machine for grinding saw blades into automatic operation; including a first hydraulic cylinder for connection to the grinding wheel carriage assembly for reciprocation thereof, a second hydraulic cylinder for c... | 11/09/1982 |
| 4331047 | Saw sharpening machine A machine for sharpening circular saw blades includes a pneumatically operated indexing mechanism, with the indexing mechanism being responsive to the position of a grinding mechanism which moves perpendicular to the plane of the saw blade to engage the c... | 05/25/1982 |
| 4072068 | Band saw teeth working machine A band saw teeth working machine comprises a framework having mounted thereon: a device for clamping a band saw by the side surfaces thereof, having abutments for the apices of the teeth of the band saw and for the back edge thereof, a mechanism for advan... | 02/07/1978 |
| 4023446 | Band saw grinder According to this invention, two band saw grinder units are constructed in paired relationship, spaced apart, and arranged to receive two band saw bands suspended from overhead supports which will permit the bands to move up and down for the grinding oper... | 05/17/1977 |
| 4018109 | Feed device for saw machining apparatus A feed device for machines which act on saw teeth, to sharpen the teeth, position the teeth, add hard metal plates to the teeth or the like, which accommodate wide pitch distances between saw teeth and variations in pitch distances between the teeth of th... | 04/19/1977 |
| 3985048 | Grinding band saw teeth Apparatus employing a reciprocating feed of a band saw to an abrasive wheel and a pitch feed of the saw to the abrasive wheel. The saw is positioned so that during a part of the pitch feed the portion of the tooth back edge adjacent to the tooth tip comes... | 10/12/1976 |
