Abstract: A clamping device (22) for use in combination with a T-slotted working surface (20) which comprises a slotted clamp member (24), a screw (36), a T-nut (42) and a nosepiece (54) whereby a spring (52) biases the nosepiece against a workpiece (16) edge to rigidly register the workpiece relative to an engraving bit head assembly (12).

Abstract: A repair terminal is disclosed for reworking defective components on printed circuit boards. The terminal has a heater arm which lowers itself over the component, and directs hot gas thereon. A vacuum shroud surrounds the heat zone around the component and removes excess heat so as to minimize damage to surrounding components. The heater arm has inner and outer tubes, the inner tube delivering hot gas the outer tube removing it. Thus the outer tube prevents an operator from being burned by the dangerously hot temperature of the inner tube. A workholder is also disclosed for holding and aligning the circuit board with the heater arm. The workholder is capable of adjustment along the X- and Y-axes as well as in the theta orientation.

Abstract: A gripper for holding a manufactured part in a X-ray inspection system. The gripper includes a stationary jaw, a slidable jaw, a gripper base, a wear plate, a centering bushing an end plate, and a cam actuated spring mechanism for opening and closing the jaws. Both jaws are removable and adjustable in a keyway. Set screws are used to hold the jaws in place for a predetermined separation and allows a part to be positioned off center. The removable aspect allows for various jaw configurations. The centering bushing includes a cam shaped opening for accepting an end of an pneumatic activated ball plunger of a numerically controlled part manipulator. The centering bushing aligns the gripper to the longitudinal axis of the part manipulator.

Abstract: A guide bar for carrier strip grips the strip ribbon between adjustable pins and can accept a wide range of strip dimensions. The pins project from spring-actuated disks that are recessed into the upper surface of a slide bar. Associated gears at the undersurface of the bar cause pairs of the disks to turn in unison.

Abstract: A jaw is secured to a stem member having a T-shaped slot through which a pair of spaced pins pass. When the jaw and member are displaced from a clamp position to a neutral position, one of the pins is aligned with the T portion of the slot and the other pin is seated at one end of the main slot. The member tilts automatically to a retracted state in response to a spring force in a given direction. When the member is rotated from the retracted state to the neutral position the same spring force slides the jaw into the clamp position. A resilient projection on the stem member automatically engages a workpiece when the member reaches the neutral position to locate the workpiece prior to clamping.

Abstract: A rectangular plate holder is formed with an approximately square recess defined by an upstanding perimetrical wall having two top studs on one side and one top stud on an opposed side wall lapped to be coplanar in a common plane. The base plates include five and three sets of mask clamping points for defining clamping points for five and three mask sizes. Each clamp includes a clamp assembly fastened to the base having a spring-loaded lower clamping arm below an upper set screw clamping point. A handle is fixed to one side between the opposed sides having the lapped studs.

Abstract: A clamp for duplicating machines for lock keys comprising a pair of jaws (1,1',2,2') which are mounted on a threaded pin (4) rigid with a clamp support carriage (3), means for approaching said two jaws (1,1', 2,2') when clamping the key, and elastic means (8,6) interposed between said two jaws (1,1', 2,2') to keep them spaced apart. The clamp comprises, in a position misaligned with the line of action of the applied clamping force and at the opposite side with repect to the gripping faces of the jaws (1,1', 2,2'), a projecting portion causing, during the clamping stage, a moment opposite to the reaction moment caused by the clamped key.

Abstract: A clamp for dipping printed circuit boards into a solder bath of a solder coater machine is disclosed. The clamp comprises first and second interdigitated, coplanar fingers connected respectively at common ends thereof to a pair of spaced, parallel first and second plates. Pivot pins respectively connect adjacent first and second fingers to each other to define a pivot axis extending parallel to and between the distal ends of fingers and the first and second plates. The second plate is spring biased from and movable towards the first plate under an applied actuating force to pivot the second fingers out the plane of the first fingers enabling insertion of a printed circuit board between clamping surfaces defined by the distal ends. The pivot pins and spring mechanism are spaced a sufficient distance from the distal ends to avoid contamination by solder particles and flux during the coating process and to avoid interference with air leveling knives closely spaced to the coated board upon removal from the bath.

Abstract: A carrier for a flat photomask substrate having peripheral edges comprises a frame, a handle, a shaft, primary rings, and a spring. The frame has two ends, a periphery, and a shape with one side open. The handle has two ends and is journaled to one of the two ends of the frame. The shaft is provided through the one end of the frame and one end of the handle. This shaft allows the one end of the frame to pivot in a freely rotatable manner about the one end of the handle. The primary rings are arranged at the other end of the frame and at the one end of the handle. Such primary rings support the peripheral edges of the flat photomask substrate. The spring extends between the one end of the frame and the one end of the handle. This spring presses the primary rings into contact with the peripheral edges of the flat photomask substrate.

Abstract: Apparatus for melting and dispensing solid thermoplastic material directly from a drum. The apparatus includes a base plate, a platen assembly mounted above the base plate, and fluid motors for effecting vertical movement of the platen assembly relative to the base plate. The platen assembly includes a follower, a heating platen located beneath the follower, and a pump for pumping molten thermoplastic material from the underside of the follower as the platen assembly is lowered into a drum supported atop the base plate. A drum hold-down mechanism is mounted on the top side of the base plate and is engageable with a drum supported upon the base plate so as to prevent the drum from lifting up off of the base plate as the platen assembly is lifted out of the drum.

Abstract: The present invention is directed to an apparatus and method for holding one or more test electrodes of precisely known exposed surface area. The present invention is particularly useful in a device for determining the corrosion properties of the materials from which the test electrodes have been formed. The present invention relates to a device and method for holding the described electrodes wherein the exposed surface area of the electrodes is only infinitesimally decreased. Further, in the present invention the exposed, electrically conductive surface area of the contact devices is small relative to the test electrode surface area. The holder of the present invention conveniently comprises a device for contacting and engaging each test electrode at two point contacts infinitesimally small in relation to the exposed surface area of the electrodes.

Abstract: A vise for holding small objects. It is particularly useful as a fly tying vise. It comprises a support bearing a housing having a rotatable central arbor carried in low friction bearings. The preferred form has a hub mounted at each end of the arbor. One hub houses a clutch or other locking device. The other hub bears a clamping arrangement having fixed and moveable members with distal jaw portions adapted to hold an object such as a fishhook. The clamping arrangement has a longitudinal axis essentially parallel to but off-axis from the longitudinal axis of the arbor. The axis of the arbor does not pass through the jaws of the clamping arrangement. This permits a hook to be held in the vise with its shank lying on the axis of rotation of the arbor. In this way body thread or other dressing can be rapidly and accurately applied as the fly is created. Jaw members have essentially parallel and planar opposing faces with the maximum opening being controlled by an adjusting screw.

Abstract: A machine for use in the fusion fitting of a branch, T- or saddle junction to a pipe, comprises a first clamp for holding pipe and a second clamp for holding the fitting in the correct orientation to the pipe. A manually-operated sliding plunger arrangement allows the second clamp to be moved towards or away from the first clamp by way of a manually operated device. The second clamp can be locked against retraction from any one of a plurality of positions relative to the first clamp, and is adapted to be loaded towards the first clamp in its locked positions during the fusion process when a fitting engages a pipe or a heating tool is held between a pipe and fitting. The shaft which controls the movement of the second clamp has a pivoting extension or plunger terminated by a handle, which can be folded upward. Pins mounted at selected intervals on the plunger cooperate with a loading plate during the downward movement of the plunger to urge the second clamp either toward or away from the first clamp.

Abstract: Each workpiece holder of a grinding machine is reciprocated relative to and turned about an axis parallel to that of a wheelhead spindle. Workpieces carried by the holder are brought from in front of and to the side of an abrasive wheel front working surface into contact with the working surface. To prevent the pieces ground by the abrasive wheel from being scratched, after the workpieces have been ground, the wheelhead spindle is translated from a region where the grinding is performed. Simultaneously the workpiece holder is turned from in front to the side of the abrasive wheel working surface. The grinding machine, for instance, comprises two workpiece holders that are diametrally opposed with respect to the abrasive wheel. The holders turn in opposite reciprocating directions. The workpiece holders carry two half-holders for optical fibers having ends to be connected together. The ends of the fibers are simultaneously and coplanarly ground by the machine.

Abstract: A multiple fixture is provided for aiding in affixing replacement spoons to worn teeth of a rotary hoe wheel. The fixture comprises a circular hub from which extends a plurality of generally equally-spaced, radially-disposed arms. The number of arms equal the number of teeth on the worn hoe wheel. Mounting members or plates are carried by the arms and replacement spoons are positioned and clamped thereon. The rotary hoe wheel is then aligned with the fixture hub and connected thereto with the replacement spoons positioned in contact with the worn end portions of the hoe teeth and welded to them.

Abstract: A tailstock for rotatably supporting a workpiece on a machine bed. The tailstock includes a vertical column fixed at the machine bed which has first and second regions. The second region of the column is coaxial with the first region and pivotally mounted to the first region. An offset arm extends laterally from the vertical column and carries a center for engaging the workpiece. The offset arm has an opening for accommodating the regions of the vertical column and is longitudinally displaceable thereon. The offset arm is pivotable when disposed at the second region and non-pivotable when disposed at the first region to dispose same in repeatable precision relation to the machine bed.

Abstract: A tool assembly for use with a prime mover, such as a bench press, for terminating a plurality of insulated conductors in a mass terminator connector. The tool assembly includes a pair of supports, at least one of which is adapted for attachment to the prime mover, for reciprocal movement relative to one another. The assembly also includes a conductor insertion die set carried by one of the supports for inserting the conductors into the connector. This die set includes an insertion die corresponding to each terminal element of the connector. Finally, the assembly includes connector holding means carried by the other support for holding the connector in alignment with the die set. The holding means has connector release means for retaining the connector in the holding means and is engageable by the connector and movable by the connector from a retention position to a release position and biased to the retention position.

Abstract: A pants presser having two flat members with facing surfaces, a heatable sheet covering at least one of the members, and a flexible pad proximate with the heatable sheets. A gripping bar is proximate with the bottom of one of the flat members for gripping the bottom of a pair of pants by pressing the pants against the other flat member, the gripping bar being movably mounted to retract substantially linearly and transversely to the plane of the member with which it is proximately mounted. A latching bar is pivotally mounted proximate with one of the members such that it latches to the other member, the latching bar having at least three detents, a full open detent for freely installing a pair of pants thereon, a half-closed detent in which the bottoms of the pants are securely held while the remainder of the pants are free and a closed detent in which the pants are tightly pressed between the flat members.

Abstract: A log or piece of cord wood is supported upright on a base member between two support members which are secured to the base member so that at least one support member is movable toward and away from the other. The base member is sufficiently large to permit a user to stand thereon to positionally stabilize the base member while a log is being split. The support members are prevented from moving inadvertently during splitting by various alternative means such as of frictionally engaging one or both support members in tracks, spring biasing the support members toward one another, positionally locking a movable support member or by detenting the support members in various positions. The support members have concave surfaces extending at least 90.degree. around and sufficiently high so as to preclude movement of the log during splitting.

Abstract: A pressure clamping structure for irregular workpieces includes initial locator points for positioning a part, multiple, opposed and spaced pressure discs operated by fluid pressure to engage the part and secure it in the located position, and spring backed support jacks engaging the part which are pressure locked in position to insure a rigid locking of the part for purposes of metal removal by machining or grinding. In addition, flexible pressure walls extending over areas of the workpiece are pressurized to further stabilize the workpiece and prevent vibration during the work operation.

Abstract: An apparatus for holding an object, such as a furnace or kiln block, in a predetermined position relative to an external metal member, such as the metallic shell of a furnace or kiln. The apparatus includes a foot assembly which is adjustably supported on a rod member, which is in turn supported by a lower side of a magnet. The upper side of the magnet is removably magnetically affixed to the metallic shell so as to secure the apparatus thereto, thus enabling the foot assembly to hold the object against the metallic shell.

Abstract: A device for holding a work piece against a table while urging it against a guide fence when the work piece is being operated on by a table saw or the like having a pair of wheels rotatably mounted on a plate member supported on the end of first and second arms, the other ends of which are held by a frame member with a spring member extending from one upper arm to the opposite lower arm, the arms forming a parallelogram and being rotatably mounted to apply force to pressure the wheels against the table, the frame being at an angle to the guide fence so that the wheels are at an angle towards the fence in the direction of the movement of the work piece.

Abstract: The trimming apparatus and fixture for holding a PC board prior to and during trimming of an upper surface of the PC board utilizes a trimming blade rotated by a variable speed motor. This apparatus includes X and Y motion mechanism moved by hand grips that are spaced apart and cooperate with push button switches providing a safety control circuit. The X and Y motion mechanism employs linear ball bushings mounted and movable on hardened steel shafts. Removable holding fixtures are employed to hold and retain the PC boards during trimming. One holding fixture is used for PC boards that are not warped and not likely to warp. This fixture holds the PC board on three sides and a quick acting cam clamp is actuated to retain and release a PC board. Another fixture is adapted to hold and retain a PC board that is warped or likely to warp. Vacuum is used with a plurality of standoffs to establish the desired holding plane of this PC board.

Abstract: A termination tool for holding cross-connect connectors, as used in telecommunications systems, while inserting conductors into the back edge of the connector, is adapted to be releasably mounted on the support member on to which the connectors are eventually mounted. The tool, of open frame form, having spaced sides, back member and a rotatable front member, has formations at the back ends of the side members which engage with the support member. A connector is inserted in a slot extending along the front member with a back edge facing forward. The conductors can be inserted, a retainer snapped over the back edge of the connector, the rotatable member rotated approximately 90.degree. to bring the back edge of the connector and the retainer facing upwards, and then the connector and retainer removed from the tool and mounted on the support member.

Abstract: The disclosure relates to a heat sink used to protect integrated circuits from the heat resulting from soldering them to circuit boards. A tubular housing contains a slidable member which engages somewhat inwardly extending connecting rods, each of which is rotatably attached at one end to the bottom of the housing. The other end of each rod is fastened to an expandable coil spring loop. As the member is pushed downward in the housing, its bottom edge engages and forces outward the connecting rods, thereby expanding the spring so that it will fit over an integrated circuit. After the device is in place, the member is slid upward and the spring contracts about the leads of the integrated circuit. Soldering is now conducted and the spring absorbs excess heat therefrom to protect the integrated circuit. The placement steps are repeated in reverse order to remove the heat sink for use again.

Abstract: In the manufacture of a cable-type tire chain having elongate flexible side members and cross-members carrying traction sleeves, the cross-members are connected to the side members by hooks which are crimped to the side members in a press. To assemble the cross members and side members, they are supported in an assembly jig, with the hooks attached to the opposite ends of the cross-members and embracing the side members. The hooks on one side of the chain are crimped simultaneously to the relevant side member in a single pressing operation while supported in the jig, which applies tension to the side member.

Abstract: A clamp apparatus for holding a door or the like in a generally vertical plane while a workman is preparing the door for hanging within a frame. The apparatus includes a base having a pair of clamping members slidably mounted thereon and such members are connected to a foot operated lever which is operated to move the clamping members apart and a spring or other resilient member urges the clamping members toward each other.

Abstract: A fluorescent tube holder comprises a fluorescent tube holding chuck having a pair of releasable claws for holding the fluorescent tube, and a base chuck having a pair of releasable claws for holding the base of the fluorescent tube on the outer periphery thereof. The base chuck is movable toward and away from an end of the fluorescent tube held by said fluorescent tube holding chuck.

Abstract: A batten setter for laying batten strips on a surface at a predetermined distance from each other which comprises a first end portion and a second end portion, said first and second end portions being connected together by at least one adjustable frame member so that the distance between said first and second end portions can be varied depending upon the desired distance between adjacent batten strips, each of said end portions including first and second spaced apart, spring-biased, guide frames which are adapted to be held in said spaced apart, spring-biased position by one of said batten strips.

Abstract: A basket apparatus for clamping a plurality of plate stacks sufficient to form one multi-celled, lead acid storage battery during the casting of the lug commoning straps in each stack is provided. As configured it comprises a frame defining a plurality of internal cavities each configured to hold one of said stacks and a set of individually biased movable clamping plates, one in each of said cavities, each adapted to hold the stack firmly in position during the casting operation. The individual biasing permits firm gripping regardless of any variability in plate or stack thickness.

Abstract: A generally rectangular frame is provided for disposition on a horizontal surface and first and second adjacent sides of the frame define convergent gripping jaws and a horizontally opening crotch at the convergent ends of the jaws for frictionally gripping adjacent peripherally spaced surfaces of a log section. An elongated third jaw is provided and pivot structure releasably pivotally attaches one end of the third jaw to selected points spaced along the first jaw for swinging of the other end of the third jaw toward and away from the end portion of the second jaw remote from the first jaw. Biasing structure is operatively connected between the third jaw and the frame and yieldably biases the third jaw to swing in a direction toward the second jaw.

Abstract: A circular fluorescent lamp manufacturing apparatus is constructed such that it can accomplish both the basing process and the seasoning process with the use of a single machinery according to the present invention. The lamp manufacturing apparatus is characterized in its head construction. The circular glass tube is based and seasoned by the two rotations of a turntable and by the four turns of 90 degrees of a paired circular glass tube supporters to be effected in that meanwhile so that the circular fluorescent lamps can be finished.

Abstract: The specification discloses a vice jaw 22 mounted in a vice housing 28. The jaw 22 includes a slidearm 44 for sliding within a slideway 46 in the vice housing. A plurality of jaw teeth are formed on the underside of the slidearm 44 and engage one or more housing teeth 50 to operate in a ratchet action. A spring 54 continuously urges the jaw 22 towards a closed or retracted position. When an object is placed in the jaw 22, the jaw teeth 48 and the housing teeth 50 are engaged and will prevent the jaw 22 from moving toward the extended position, but will allow the jaw 22 to move toward the retracted position.

Abstract: A magnetic bubble memory packaging tool comprising a stationary base having a bias magnet replaceable mounting arm which cooperates with a moveable bias magnet replaceable mounting arm on a moveable base, the latter being coupled to move relative to said stationary base by a spring biased screw arrangement. With the bias magnets positioned on opposite sides of the mounting arms and with the yoke positioned to a compass the arms, and the bias magnets, rotation of the screw increases the bias of the spring urging the arms and magnets in a direction away from each other and into engagement with the inside walls of the yoke. The spring bias is a measure of the pressure with which the bias magnets engage the yoke for bonding and the screw is calibrated so as to select the bias of the spring.

Abstract: This invention relates to a method of locating a rectangular board including a printed circuit board on a support for correctly positioning the board relative to an electrical component inserting machine which inserts terminals of the components into pre-drilled holes in the printed circuit board. The board is provided with one V-shaped notch in the center of each of its end edges and in one of its side edges. The board is disposed roughly in position on the support which has three retractable spring loaded locators thereon in positions corresponding to the notches, and retractable spring loaded abutment pad. Rough positioning of the board on the support is assisted by a pair of diagonally opposed right angle guides on the support. The board is mounted on the support with the locators and the pad retracted. Then the locator at the end edges of the board are released so that V-shaped wedges thereon engage in the respective notches in the end edges of the board.

Abstract: A self-alignable holder holds a row of coupling elements mounted on a slide fastener stringer tape in alignment with a slot cutter regardless of the size of the coupling elements. The holder includes a base having a slot receptive of the stringer tape, a pair of parallel holding plates movably disposed on the base for laterally sandwiching the row of coupling elements therebetween, a pair of parallel-motion links pivotally connecting the holding plates together, and a pair of supports mounted on the base and pivotally supporting the links so that the gripping edges of the holding plates are equidistant from the longitudinal axis of the slot. Spring means in the base urge the holding plates laterally toward each other for holding the row of coupling elements in longitudinal alignment with the slot axis resiliently with equalized lateral forces.

Abstract: Apparatus for molding material including a frame for holding the material and which is movable away from the molding die so that the material can be loaded and unloaded into and out of the frame at positions clear of the die. The frame has spring biased movable mountings having pins which penetrate the material and hold this in a resilient manner during molding. A turntable support is provided for holding two of the frames on opposite sides of a vertical axis, and this holds one frame in a convenient loading position while the other frame is holding material being molded.

Abstract: A workpiece holder adapted for an operator having only one useful arm is disclosed wherein the retainer for the workpiece is mounted on a turntable that can be locked into position by using one hand. The retaining jaws can be simultaneously opened by the weight of the operator's arm on a flange connected to one jaw while the workpiece is inserted.

Abstract: A heat shielding tool is disclosed, having a pair of opposed pivotally connected handles terminating in a pair of opposed jaws. The jaws have interiorly relieved arcuate areas so that, when closed, they will form a circle so that the circular opening formed thereby can be clamped about a pipe or tube. The jaws also have external heat dissipating members taking a variety of forms but which can be generally broadly termed fins. In this manner heat generated by soldering a pipe joint will travel along the pipe or tube to the tool and be dissipated into the atmosphere. The handles also have tension means carried thereon which will serve to normally urge the jaws toward mating or closed position so that the tool may be readily clamped about the pipe or tubing.

Abstract: An insert that is to be embedded in a molded object is attached inside the mold in a resilient manner so that stresses caused in the area of the molded article surrounding the insert due to shifting of the molded article during cooling can be minimized.

Abstract: A garment holding turret system for a flocking machine including spring biased means for holding excessive portions of a garment in place while the adhesive is being applied and during the flock cycle. The turret has no protuberance at the chest or stomach of the operator to hinder the operator's movements in placing a garment on the turret or during the screen printing operation. The turret can be rotated in one direction for setting up the machine or making adjustments without activating the high voltage and can be rotated in the other direction to activate the high voltage for the flocking operation.

Abstract: A flap positioning assembly of the type primarily designed to dispose the inner flap in substantially conventional containers into a position relative to the exterior flap so that stapling or otherwise securing of the flaps may be facilitated. A support frame includes a base plate and outwardly extending support arms having a clamp arm movable relative thereto by means of an orienting shaft capable of being manipulated to allow the clamp arm to be positioned in a clamped and non-clamped relation to the flaps of the container.

Abstract: A portable vise for holding fish hooks for tying on flies comprises a hollow body, capable of being carried in a jacket pocket, having at one end an effective loop that is normally resiliently retracted into the body and which in operation clamps a fish hook against the fixed end of the body.

Abstract: A spring clamp for holding a paper log (rolled up newspapers) while twisting tie wires around the end portions thereof. The clamp comprises a pair of spring-actuated curved jaws which have a laterally flexible cord across the free ends of the jaws to embrace the log, the cord extending through jaw openings and being connected to the ends of springs projecting laterally from the jaws. The springs are arranged to buckle when the jaws are separated to provide a large range of opening movement of the jaws by a substantially constant jaw opening force and a substantially constant tension on the cord.

Abstract: A spring box assembly for use in clamping mechanisms of the over-center type comprises two nested metal housings, at least one spring located between such housings, and means for resiliently holding said housings together with a predetermined initial tension applied to the spring. In a preferred embodiment, at least one metal pin is secured at one end to the bottom of the inside housing and slip fitted in holes in the outside housing at its other end, a helical spring is located around such pin and means are mounted on the other end of such pin for holding the two nested housings together with a predetermined initial tension applied to such spring.

Abstract: The invention relates to apparatus for supporting or clamping bodies of irregular shape, (particularly large workpieces) comprising a clamping jaw, in the form of a box with axially moveable plungers extending from its work face, said plungers being supported in different axial positions, determined by contact with the surface of the workpiece, by a solid medium within the box. Known apparatus do not have positive means for locking the plungers in their positions. The invention provides a simple and effective locking arrangement in which the solid medium is a multiplicity of hard balls, each plunger is formed with ball-receiving cavities, and application of a pressure to the balls is transmitted via the ball-receiving cavities to lock said plungers.

Abstract: Ball rounding apparatus includes a rotatable inner rolling die and a stationary outer die. Forged steel balls travel through an arcuate path between the dies for final rounding. The stationary outer die is made up from a plurality of segments known as die shoes. A plurality of circumferentially-spaced die shoe tension take up devices bias the die shoes toward the inner die. The die shoe tension take up devices include a one-piece plunger having an enlarged head with a flat outer surface engaging the die shoes. An integral smaller diameter shaft extends from the head of the plunger, and a small radius is formed between the shaft and head. The plunger shaft is guided for longitudinal movement through a guide sleeve, and a coil spring is positioned between the plunger head and guide sleeve for urging the head into engagement with the die shoes. The guide sleeve is adjustable for varying the distance between such sleeve and the plunger head to vary the force exerted by the coil spring.

Abstract: An ultrasonic wire bonding chuck includes first and second jaws for squeezing therebetween and clamping securely thereto said state frames utilized in forming microintegrated circuit solid state devices by ultrasonic bonding techniques. A clamping finger is provided for each lead on the frame secured by the chuck. Additionally the clamping surfaces of both jaws are roughened to provide enhanced gripping action on the member to be clamped and are arranged to substantially eliminate the effects of frame burrs and distortion on the clamping of the frame.

Abstract: A horizontally rotatable and elevatable hold down arm that is adapted to engage and securely hold material that is being worked on, such as wood that is being sawed. The hold down arm is simply operated and positioned from the operator's position at the saw.

Abstract: A device useful in the manufacture of ceramic tile sheets is provided, having a peripheral rim along three edges of a rectangular backer board structure. The fourth peripheral edge of the backer board structure is open to permit insertion of individual tile pieces and removal of an integral tile sheet. One of the closed edges is movably mounted to the backer board structure, and includes handle means for manipulating the movable edge of the device. The handle means also functions as an alignment means for the movable edge.