Disclosed is a polyborosilazane having a B/Si atomic ratio of 0.01 to 3 and a number-average molecular weight of about 200 to about 500,000 which can be pyrolyzed to give ceramics. The polyborosilazane is produced by reacting a polysilazane having a number-average molecular weight of about 100 to about 50,000 with a boron compound.

Polyborosilazane and process for producing same

A polymer cutter with a rotary cutting head in which the cutting edges are on the circumferential periphery of the head, and in which the cutting edges shear rather than slice the polymer is described. The knife blades on the rotary head have a cutting edge angle of greater than 70°. The apparatus is especially useful for cutting thermoplastics and may be used for preparing polymer granules or pellets.

Polymer cutting apparatus and method

Embodiments provide various components of a chain saw, including saw chain elements, sprockets, and other fixtures, that may facilitate sharpening of cutter links during operation. In various embodiments, the components may increase stability during sharpening, provide nose mounted sharpening fixtures, and/or facilitate the resizing and/or reshaping of a sharpening element.

Chain link sharpening method and apparatus

A cutter device has a cutter portion which is led by a depth gauge. The depth gauge is mounted on and extends upwardly from a substantially planar main body section. The depth gauge has a forward, or first section which extends upwardly from the main body, and when viewed from above is disposed at an angle relative to the central plane of the main body diverging therefrom on progressing rearwardly. The rear end of the first section is connected at a juncture section to a second section which progresses rearwardly and is disposed at an angle converging toward the central plane. The second section may extend across the plane of the body and diverge from the opposite side thereof on progressing rearwardly. The upper surface of the depth gauge presents a sweeping curve as viewed from the front of the cutter which is a multiple of the thickness of the body to which it is attached to provide effective cut control for the following cutter.

Depth gauge for cutter

Apparatus, kits, and methods for sharpening electric shavers having rotary and reciprocating-type cutting members are disclosed. A sharpening apparatus in accordance with an exemplary embodiment of the present invention may include an applicator tray or other applicator means, and an abrasive material configured to abrade and sharpen the cutting surfaces of the electric shaver, when actuated.

Blade sharpening for electric shavers

A gulletless saw chain having a cutting link with a cutter portion that is configured to be top sharpenable. A depth gauge portion is positioned in close proximity to the cutting edge corner of the cutter portion. The depth gauge is laterally offset to position the outer most edge of the depth gauge at the corner of the cutting edge to thereby control side penetration as well as depth penetration of the cutting edge. A drive link preceding the cutting link includes a guide portion with an inclined leading edge that corresponds with the leading edge of the depth gauge. A shallow V shaped opening is formed between the depth gauge and drive link guide portion to assist the cutting link in tracking in the kerf.

Saw chain with improved cutting depth control

Embodiments of the disclosure provide a saw chain having cutter links having a cutting edge on a first end and an opposite second end adapted for πding on or along a rail of a guide bar First drive links are coupled with the cutter links and are adapted to ride in a groove of a guide bar The first drive links have a clean out tang sized and shaped to scoop debris from within the groove and have two first drive link side surfaces on opposite sides thereof adapted to have at least occasional wearing contact with interior side walls of the groove Second drive links are coupled with the first drive links and the cutter links, and are adapted to nde in the groove of the guide bar

Saw chain having multiple drive link configurations

The specification discloses a completely outside sharpenable saw chain of the chisel type in which top plate portions are sharpened on their tops and in which side cutter portions are sharpened on their outer sides. The chain has allochiral cutter teeth each having a top plate portion sloping rearwardly and downwardly and joined along one side edge to a side slitter plate portion sloping rearwardly and inwardly, a bent over shank portion, a body portion and a depth gauge portion, the top plate portion, the side slitter plate portion and the shank portion being generally C-shaped. The top plate portion has at its top a sharpenable surface forming a top cutting edge which joins a corner chisel point from which extends downwardly and rearwardly a side slitting edge formed by a side plate sharpenable surface. The top plate portions are sharpened employing an attachment securable to the nose end of a saw bar around which the saw chain passes, the attachment carrying a flexible strip of abrasive material held against the saw chain top plate portions as a result of flexure of said strip. The attachment further includes a pair of side elements having abrasive surfaces spring biased against the side cutter portions.

Saw chain sharpening method and apparatus

A cutting tool having cutting teeth. The cutting teeth are formed on one end of inserts that are seated in slots provided in the body of the tool with the cutting teeth projected outwardly of the slots. The inserts are produced from a resilient material that is preset in a bowed configuration with the slots having substantially straight side walls. A relief opening is provided in the bottoms of the slots and the seated inserts are forced into an open, substantially straight position with a tail section that curls into the relief opening. Flanges provided on the inserts overlap the edges of one side wall of the slots to resist lateral displacement.

Cutting tool with cutting tooth insert

A cutting tool for use in applications wherein a kerf is formed during the cutting operation. The cutting tooth is formed on the cutting tool including a rearwardly angled inner relief surface against which the material being cut is impacted. A secondary surface intersects the inner relief surface and extends forwardly of the point of intersection at an angle relative to the direction of cut that is oppositely directed but generally equal to the inner relief surface. The force of the material being cut that is deflected onto the secondary surface is outwardly directed and counterbalances the inwardly directed force imparted onto the inner relief surface.

Scott Lewis A

Papers

Saw chain with improved cutting depth control

Saw chain having multiple drive link configurations

Saw chain sharpening method and apparatus

Cutting tool with cutting tooth insert

Cutting tool with improved depth control