Abstract: A propeller grinding device and method employs two endless grinding belts which are transported past a grinding station to finish the front and back surfaces. A propeller blank is inserted between the belts and the belts are distorted by platens, each of which includes a plurality of independent platen vanes. Two cams selectively bear upon two camming surfaces of the vanes and move the vanes into desired positions corresponding to the surface contours to be formed on the front and back surfaces of the propeller blades. The cams are rotated as the blade is moved. They also may be moved along the camming surfaces. Additionally, the cams and platens may be moved parallel to the direction of cam rotation with respect to the belts. SUBACKGROUND OF THE INVENTIONThe present invention relates to grinding devices and, more particularly, to a grinder having an endless grinding belt capable of grinding contours, such as the airfoil shape of a propeller.

Abstract: A machine for successively grinding and polishing tools such as gravers of hard metal has grinding and polishing wheels mounted in parallel shafts on a support which can be moved to bring either wheel to face a tool held in a workpiece holder. The polishing wheel can be moved to an extreme position which is precisely set by a micrometer screw so that it comes to occupy exactly the same position formerly occupied by the grinding wheel. Alternatively, the workpiece-carrier can be moved by a cam system to exactly position the tool against the two wheels.

Abstract: Semiconductor wafer polishing apparatus is described having a sheet of wafer mounting material on its carrier to rigidly hold a plurality of wafers to be polished during the polishing operation. The mounting material includes a lamina of a polymeric material which exhibits surface wetting characteristics to aid in adhering the back side of wafers thereto and a lamina of a volume compressible material which absorbs without wafer deformation any asperities on the back side of such wafers.

Abstract: An acoustic suppression panel is provided with a perforated plate covering a layer of a bulk absorber. A flexible, fluid-impervious membrane is placed between the plate and the bulk absorber, and supported in a manner so as to permit the membrane to become essentially acoustically transparent. An acoustically hard backing plate is disposed adjacent the bulk absorber, the backing plate being provided with perforations to allow pressure equalization for flight applications. A facing sheet of sintered metal covers the perforated plate to provide an aerodynamically continuous flow surface for the plate which is highly resistant to foreign object impact.

Abstract: An actuator for a rotating frame animal trap. The actuator comprises two arms spring biased at one end to tend to move the other ends of the arms outwardly. Each arm terminates in a ring that is adapted to encircle adjacent frames of the trap. The ring on each arm is inclined out of the longitudinal axis of the arm, towards the other ring on the other arm. The actuator is easy to make and provides excellent squeezing power where that power is required.

Abstract: An animal trap having two similar frames each having jaw forming sides that lie in a common plane and ends extending therebetween to support the jaws. The ends have a central portion in which the frames are pivotally connected through adjacent ends for rotation about a common axis between set and closed positions. Outer portions on each side of the central portion extend to the jaws. At least one actuator is capable of rapidly and forcefully effecting the rotation. The actuator has two arms spring-biased at one end so that the other ends, which terminate in rings encircling adjacent ends of both frames on opposite sides of said axis, would, if unobstructed, move apart to a distance substantially greater than the length of the frame ends. A trigger means releasably maintains the trap in the set position. The trigger means comprises a pivotally mounted treadle extending between the frames of the trap. Engagement means are associated with the treadle.

Abstract: A plumber's handle pulling tool for pulling valve handles from valve stems includes an outer stabilizing clamp providing a pair of substantially "C" shaped stabilizing arms affixed to an outer bar element, an inner handle pulling clamp providing a pair of substantially "C" shaped pulling arms affixed to an inner bar element, and a threaded rod rotatably affixed on one end thereof to the inner bar and threadably disposed through a threaded aperture located in the outer bar element.

Abstract: The present invention relates to an improvement in a mechanism wherein a flywheel which is idly mounted on a spindle of a machining center is easily and speedily connected with or detached from the spindle by a clutch which is fitted on the spindle adjacent to the flywheel for promoting the cutting efficiency by providing spindle inertia of two kinds; one kind for heavy cutting and another for light cutting respectively.

Abstract: An apparatus for cutting off castings from investment cast set-ups comprising a mandrel assembly engageable with the inside of the center tree of the set-up to clamp it with its longitudinal axis in a horizontal plane, a vertically movable carriage support, a carriage movable along the support parallel to the longitudinal axis of the center tree, a cut-off assembly including a horizontal abrasive disc on the carriage, and structure permitting lateral adjustment of the cut-off assembly in a direction normal to that of carriage movement.

Abstract: A cam grinding machine rotates a workpiece by using a servomotor which is capable of being rotated at a variable speed. A memory device stores data of rotational speeds of the workpiece corresponding to angular positions thereof in order to maintain the circumferential speed of the workpiece constant. A detecting device detects an angular position of the workpiece. A counter is responsive to the detecting device and reads out rotational speed data stored in the memory device in order to apply the same to the servomotor.

Abstract: One end of a base plate is formed with an elongated opening and the other end rotatably supports the base end of an elastic plate whose free end is inserted in the above mentioned elongated opening. The elastic plate is longer than the base plate and formed with an engagement projection adjacent the free end thereof. In setting the elastic plate, it is upwardly curved and an engagement member is interposed between the upper surface of the base plate and the engagement projection so as to engage the elastic plate and maintain its curved condition. The engagement member will be moved by a small animal taking a bait or by the weight of a small animal treading on the base plate. Such movement of the engagement member results in relieving the engagement, so that the elastic plate is instantaneously elastically restored to its flat condition, thereby trapping the small animal by squeezing it between the base plate and the elastic plate.

Abstract: A housing for an arrangement of mechanical gears which includes pairs of meshing gears for transmitting driving force between a drive shaft and a driven shaft. The housing comprises a high strength supporting structure carrying bearings for journaling the respective shafts for each of the gears. The supporting structure includes a plurality of individual bending resistant girder members extending between the bearings journaling the shafts for the gears of each pair of meshing gears. The girders which extend between the bearings correspond to and absorb the reaction forces acting between the bearings. The girders have reinforcing chords made of material which is rigid along the longitudinal direction thereof. A protective skin which is unstressed by the reaction forces encloses the entire arrangement of gears and the supporting structure.

Abstract: A headstock for a cam grinding machine comprising a headstock housing for housing a work spindle rotatably supported on a rocking table which is urged by means of springs to be pivoted so as to contact master cams carried on the work spindle with a follower roller. The headstock housing is provided with a pair of spaced through bores co-axially extending in parallel relation with the work spindle. A follower support assembly and a wheel support assembly are held in engagement with the bores in the headstock housing in a manner of selective use, so that the follower roller and a master cam grinding wheel are selectively supported with the same support reference, to be rotatable about the axis of the bores.

Abstract: Disclosed is a manual, disposable sandpaper device. Cut and formed from a single blank of cardboard, a rectangular member is creased to be folded upon itself to form a rigid member with two free surfaces. Adhered to one surface is a sheet of sandpaper. Cut into the upper member is an integrally formed pair of tabs joined at a common, centrally disposed crease line.

Abstract: A decoy assembly having a plurality of decoy members of generally flat configuration shaped in profile to resemble ducks or other game species and including a support which is adapted for movement between closed, collapsed and open, expanded positions. At least some of the decoy members are connected to the upper surface of the support for rotation with respect thereto about a vertical axis, so that when the decoy assembly is in use, i.e. floating on a body of water, the decoy members may assume varying attitudes within overall position patterns so as to produce a more natural appearance of the assembly.

Abstract: Fishing rod attachment, through which fishing line is passed, responsive to the tension in line developed by the pull of a fish caught on the line, which attachment includes an indicating light that is turned on when the line is under tension. The reverse motion of reeling the line back is not impeded by the attachment.

Abstract: A slicing band consists of a base and an integral reduced cross section shank which is formed continuously throughout the length of the band. At the end of the shank is a scalloped cutting edge with inclined faces which intersect at the cutting edge of the scallops. The blade is constructed from an apparatus which utilizes two rotatable grinding wheels each with a flat annular grinding surface adapted to contact first one side of the blade and then the opposite side of the blade while the blade is yieldably retained against lateral movement and to effect material reduction to form the reduced cross section shank. The grinding wheel consists of cubic boron nitride, capable of performing material removal without burning or compromising the strength or other material requirements of the blade.

Abstract: A knife has a generally flat blade with a sharp curved lower cutting edge which terminates forwardly and rearwardly in sharp cutting ends; an upper surface of the blade opposite the cutting edge is extended upwardly and forms a stem, and a curved cross section outwardly pointed handle is connected to the stem so that maximum cutting force occurs on portions of the cutting edge nearest the rearward end of the blade. A food chopper is constructed with an upward and forward curving handle and a distal forward pointed end and a rearward proximal curved sharp end on the blade and with decreasing radii of curvature toward the rearward proximal end. A cutting knife is formed with a cutting edge of uniform radius of curvature terminating forwardly and rearwardly in distal and proximal pointed ends, with a central portion of an upper surface of the blade curving upward and rearwardly and integrally forming a stem.

Abstract: A butcher's meat saw has a housing from which extends a flat guide plate having an edge along which is slidable a blade reciprocated by an eccentric-type drive mechanism within the housing. Either the edge of the guide or the edge of the blade is formed with a groove and the other edge fits in this groove. One of these edges is furthermore formed with laterally opened notches so as to facilitate cleaning of the saw.

Abstract: A grinding material comprising a multiplicity of hollow bodies whose walls are formed of abrasive grains and a bonding means and are arranged to be stable in resistance to grinding forces.