Abstract: A tube cutter comprises an elongated handle formed in two longitudinal halves and having a C-shaped head at one end also formed into halves and defining an opening through which a tube can be inserted, a C-shaped body rotatably mounted within the two half portions of the head and comprising an opening of substantially the same width as the opening of the C-shaped head, a pawl and ratchet system formed at least between one of the contacting surfaces of the body with a half portion of the head, and a tube cutter assembly mounted on the body and including a tube cutter member mounted on the body, a tube abutment member slidably mounted in the body for radial movement towards and away from the cutter member, and control means mounted on the body to move the abutment member towards the cutter member to press a tube between the two members, such two members having a spacing therebetween in register with the openings of such body and head whereby a tube can be inserted through the registering openings in the body an

Abstract: A cutter for trimming plastic pipe which has been roughed in with an end projecting through an opening in a floor so that the trimmed end is in fixed relation, above or below, the surface of the floor. The cutter comprises a housing with its lower end riding on the surface of the floor, an internal saw with its cutting edge in a plane parallel to the surface of the floor received within the pipe end adjacent one side of the pipe and vertically adjustable to establish the level of cutting, and internal guide fingers exerting a thrust on the side of the pipe opposite the saw and adjustable to move the housing sufficiently to force the saw through the wall of the pipe end after which the fingers guide further rotation of the housing about the axis of the pipe end to complete the cut.

Abstract: An internal pipe cutter comprises a rotatable mandrel having a cutting drum and a guide drum mounted thereon. The guide drum is longitudinally adjustable relative to the cutting drum and controls the depth at which the cutting drum is received inside the pipe. The cutting drum includes a slidably mounted cutter which is projected outwardly into engagement with the pipe by centrifugal force. The cutter comprises a slider block having a radially adjustable cutting blade. In addition, one surface of the cutting drum has an access slot which communicates with the slider block enclosed inside the drum. The access slot allows a tool to be inserted into the cutting drum as necessary to unjam the cutter without having to dismantle the cutting drum.

Abstract: A safety knife with basic features of a switchblade knife comprising a pair of side plates, a blade, an interplate and a pin, wherein the blade has a locking slot at a top and another locking slot at a bottom thereof, a rack insertion hole and an opening in which a shaft pin provided with gear is fixed, the rack insertion hole having such a size and being provided in such a portion of said blade that a rack can travel smoothly therethrough engaging with the gear provided around the shaft pin, and the interplate has a spring portion and a locking claw at the end of the spring portion, said locking claw being to interact with the locking slots.

Abstract: An improved cutting assembly for rotary lawn mowers, edgers, trimmers or the like, including a body member arranged for rotating about an axis normal with the cutting plane. At least two cutting lines are attached to the body member on a compound spool for rotation therewith in the cutting plane. The invention includes means for detachably securing the lines to the body member and for storing a supply of the line on the spool so that the line may be paid out as the working portions of the line become shortened through wear. The cutting lines are preferably nonmetallic so as to reduce the hazardous condition which would otherwise be present for the operator and still provide an apparatus which will cut with great efficiency and safety.

Abstract: After retraction of the periostium a rectangularly shaped channel, having a configuraton equal to the shape of the implant, is cut in the jawbone beneath the ridge crest. The channel is checked with a gauge having a shape substantially the same as the implant but having slightly smaller dimensions. The channel is then enlarged and again checked with another gauge, slightly larger than the first. The process is repeated until the channel is of the proper size. A rectangularly shaped implant having two spaced apart substantially parallel vertical side walls is then inserted into the channel so that the entire implant is below the top level of the bone. The walls of the implant are then cammed outwardly with the use of screw means so as to press against the walls of the channel to secure the implant in place.

Abstract: The invention includes formulated dental filling materials comprising a polymerizable organic plastics material containing inorganic fillers, which filling material comprises at least two pastes in intimate admixture with one another in a paste/paste system in which hardening is initiated by means of a peroxidic initiator and an accelerator, wherein said at least two pastes contain different inorganic fillers with different chemical constitutions such that one of said at least two pastes contains filler with a substantially higher proportion of elements with high atomic number than does the other of said at least two pastes. Also included in the invention is a dental filling pack containing said formulated dental filling materials as well as a method for their use.

Abstract: A dental handpiece connector is adapted to be inserted between a standard dental handpiece and a standard supply tube for the handpiece. The connector allows rocking movement of the handpiece about a transverse axis and also allows rotary movement of the handpiece about a longitudinal axis, while continuing a supply of air or air and water from the supply tube to the handpiece. There is a detent to establish a preferred rocking position of the handpiece relative to the connector.

Abstract: A jig for the cutting of proximal boxes or outline forms in dentistry employs a guide table and paralleling arm. The guide table is located over the teeth by the clamping action of a pair of depending retentive arms which engage the embrasure area between adjacent teeth. The paralleling arm, which receives the dental burr, is swingable over the guide table and the latter and the arms in turn are provided with guide surfaces for determining the location and attitude of the buccal, lingual, axial and cervical walls of a proximal box.

Abstract: An insolation survey device for determining the exposure of a reference point to a cyclically varying radiation source. The device employs a base member for horizontally supporting a display sheet premarked with a grid calibrated in units corresponding to the measurement being taken. A transparent reflective member is supported by the base member over the display sheet so that a reflected view of the surrounding appurtenances and the view of the display sheet, through the transparent dome, form one composite picture. In the composite picture so formed, the period or periods, if any, within the radiation cycle that the reference point will be exposed to said radiation appear as unobstructed sky superimposed onto the premarked grid. A compass is provided to directionally align the device and means are provided for orienting the base member in a true horizontal plane.

Abstract: This disclosure relates to a novel tracer head comprising a stylus, stylus support and housing, and two perpendicular differential transformers. The stylus has a unique configuration enabling more precise memory of its null position when the stylus is not deflected. Further, the stylus has a rotating top pin for contacting the pattern or template that assures a condition assumed in tracer control systems but not achieved under all conditions, i.e., the stylus will deflect away from the template normal to the template edge.

Abstract: The invention contemplates an improved work-contacting probe for use in a measuring machine wherein the relationship between contacted locations on a workpiece are reduced to coordinate digital data. The various described probe embodiments feature means whereby positional errors due to probe flexure upon work contact are substantially reduced, as compared to pre-existing structures.

Abstract: A template has a base formed with a hole and a cylinder aligned with the hole and detachably connected to the base. Prior to applying cement and tile, the base is located over an enlarged hole in the counter with the cylinder projecting up. The cylinder maintains a clear hole through the cement and tile through which a faucet fits. If necessary, the cylinder may be detached from the base and removed. A single template may accommodate three cylinders for two faucets plus the spout of a water mixer. Further, a large template may fit into the space of a removed section of the counter and have a large hole for a basin plus one or more cylinders.

Abstract: Apparatus for determining the gauge and price of fasteners such as bolts and screws. The apparatus includes an array of channels from which the gauge is determined, and further includes a plurality of pages that cooperate with the channels to determine the price of a fastener.

Abstract: An ophthalmic measuring device for measuring vertex distance and pantoscopic tilt angle is disclosed. The device has a body and two arms which move slidably relative to each other to contact the eye and trial lens and a scale which measures the eye-lens distance. An implement for measuring the angle at which the spectacle temples are tilted relative to the frame front is also part of the device.

Abstract: A lighted sight pin for archery bows which provides a small point of light for aiming the bow in dim light or at night. The sight pin is structurally protected against damage by brush, tree limbs, etc. and is completely solid state for dependability and long life. A fiber-optic rod transmits light from a light-emitting diode (LED) activated by a voltage source to the sighting end. The light-transmitting rod is surrounded by a rigid shaft or tube. The LED is spaced from the sight end of the rod, allowing the sight end to be extremely small for accurate aiming yet easily visible and fully protected from damage by the rigid shaft or tube and other structure.

Abstract: A variable angle aperture card includes an elongated flat rule foldable compactly and unfolded to provide a horizontal rule with a longitudinal slot with a slide member having a foldable vertically positionable aperture card thereon with a generally rectangular viewing opening therein of a standard photographic print size, which card is slidably adjustable in the slot. Degree of Acceptance and Equivalent Lens Focal Length scales are adhered to the rule on either side of the slot, so that the aperture card is adjustable to a position thereon properly framing the subject, whereat the photographer reads from the scales the angle of view for different camera formats, and determines which lens must be used to photograph the subject from the position at which the framing was made. The combined rule and aperture card may be folded flat for transportation and storage.

Abstract: Hydrated materials such as bean paste are controlled as to their moisture content to an intermediate moisture content such as 12% to 40% on dry basis and higher than their plastic limit, and are then extruded into strips under vacuum, followed by the granulation of said strips under vacuum by applying thereto mechanical shearing force to produce granules of desired sizes.

Abstract: A method and apparatus are disclosed for drying and pelletizing organic material such as animal waste, sewage and the like. The organic material is dried in two stages using a high temperature, rotating primary drying drum, and a lower temperature secondary louvred drying drum. The primary drum includes an inlet section and an outlet section. The inlet section includes a plurality of transverse chain curtains for increased heat transfer to the organic material, for breaking up the organic material and for cleaning the sides of the drum. The primary drum outlet section includes a plurality of vanes angularly attached to the inside of the drum to form an auger to retain the material in the drum until it is partially dried to a desired level. The organic material is then transported to the secondary louvred dryer. The louvred dryer includes an input section, an output section and a central pelletizing section formed by adjacent portions of the input and output sections.

Abstract: A method and preferred apparatus for conditioning materials such as tobacco using an airflow distributor means. A conveyor transports the material along a path, and means to control the conditioning of the material are located at selected locations. A source of gas produces a gas stream, and means are operatively associated with the source of gas to selectively condition the gas stream. Flow straightening means having a structure such as a honeycomb panel are positioned upstream of the material being transported on the conveyor. The gas stream source is positioned to direct the gas stream through the flow straightening means to spread the gas stream evenly across the conveyor surface for uniform conditioning of the transported material. The conditioning may include heating and/or cooling the material, introducing moisture into the gas stream, adding chemicals into the gas stream, or selected combinations of these.

Abstract: A shelf arrangement is disposed within the vacuum drying chamber of a freeze dryer. The shelf arrangement has multiple vertically-movable shelves that are suspended by stops on flexible wires stretched between upper and lower brackets of a frame assembly. Each shelf has four flanges extending from the edge thereof which comprise arms that straddle corresponding wires thereby engaging the stops so that the shelves are positioned in a vertical arrangement. The slots between the arms of the flanges allow the shelves to slide vertically along the wires when multiple screw members which engage following threaded nuts attached to the lower most shelf of the group of shelves are rotated. Thus, as the lower most shelf is raised, it engages the next highest shelf and so forth until all of the shelves are elevated vertically against the upper bracket.

Abstract: A workbook is provided for the study of preparing not only an expected answer from a given problem but also an expected problem from a given answer. This workbook comprises a first page provided with a problem section and an adjacent expected answer guide section, adjacent to each other, a transparent second page superimposable upon the first page, and an opaque sheet adapted to be inserted between the first and second pages. The second page is provided with an answer section, and an expected problem guide section both of which are respectively located at corresponding positions above the expected answer guide section and the problem section when the second page is superimposed upon the first page.

Abstract: A simulated view on a viewing surface of a raster scan television display of a changeable illuminated area located on a plane surface is provided. The source of illumination is a cone of light whose apex can be located at any distance from an eyepoint and the plane surface and whose conical surface intersects the plane surface creating the illuminated area. Electronic components determine when a line of sight from the eyepoint through the viewing surface intersects the illuminated area. For each line of sight intersection point lying within the illuminated area, a corresponding illumination is created on the viewing surface.

Abstract: A target system is disclosed which is responsive to and indicative of the ts and areas of near miss of laser light pulses that have been shot from a laser weapon aimed at the target system, be it a simulated gun or other device, by a marksman. In addition to the bullseye indicia on the face of the target system, the target system comprises a quadrant arrangement of laser light detectors that are located on the front of the target system in such manner as to permit them to sense the laser light pulses. The detectors are connected in unique combination with data processing channels, programmed timers, a preprogrammed read only memory logic circuit, and an array of lights disposed around and near the perimeter of the target face. The latter mentioned lights light up in accordance with the approximate location of the hits of the laser light pulses relative to the bullseye of the target face, thereby indicating either a hit or the direction of a near miss to the marksman.

Abstract: The invention provides a device for teaching concepts of numbers and mathematical principles comprising a base component having a surface divided into a hundred identical unit squares in ten by ten format, and two series of number elements for use with the base component. Each number element of the first series is dimensioned so that it corresponds exactly in size and shape with a whole number of the unit squares on the base component and displays unit squares corresponding to those unit squares it covers on the base component when it is placed on the base component. Each number element of the first series is marked with the number which it represents in terms of the unit squares. Each number element of the second series has a length corresponding to ten unit squares and a width corresponding to a plurality of unit squares.

Abstract: A shoe sole construction and method of making same comprising forward and rearward sole parts of wood having a flexible intermediate part of foamed polyurethane connecting said wood parts. Said polyurethane intermediate part is located adjacent the ball of the wearer's foot and has a laterally extending insert embedded therein, the ends of which are adapted to receive fastening means for securing the shoe upper at that location. During manufacture of the sole, the wooden parts are placed in a mold and then the polyurethane is introduced so as to form the intermediate part which upon curing, chemically bonds to the wooden parts.

Abstract: An orthopedic shoe with a domical forefoot protective guard to provide a safety zone for the distal portion of the foot. The shoe includes a generally rigid sole, to which the protective guard is attached and which extends about and overlies the dorsum of the toes. Spacer means may be utilized to provide additional forward clearances as may be required in certain deformity corrective surgical procedures.

Abstract: In this ski-boot and ski-binding assembly the boot comprises lateral protruding anchoring members disposed at a same distance from, and on either side of, the middle point of the boot, and the ski carries on its top a flat case having a central "O" mark coincident with the corresponding "O" mark of the ski; on either side of the flat case pivotally mounted hook means disposed at equal distances from the central "O" mark are adapted releasably to retain the boot by engaging the anchoring members of the boot. These anchoring members and hook means may be disposed by pairs, and the anchoring means may consist of the opposite ends of transverse metal rods embedded in the material constituting the sole of the ski-boot. Possibly, a single flat metal member may be used to provide the anchoring members, or the rods may be interconnected by a perforated metal plate.

Abstract: In order to accurately control the cutter head of a cutter head suction dredger anchored by means of ropes, the tension in at least one of the two longitudinal ropes is measured and the winch of at least one of the two longitudinal ropes is actuated in dependence upon the tension measured in the one longitudinal rope.

Abstract: A yellowing resistant label to be attached to articles of clothing, bedclothes, sundry goods or the like which comprises a fabric base and a porous nylon resin layer formed on the surface of the base, said nylon resin coating composition being prepared by dissolving a nylon resin in a solution of calcium chloride in methanol and adding thereto 5 to 25 PHR of a plasticizer for a nylon resin such as 2-ethylhexyl p-hydroxybenzoate, the label is prepared by applying the nylon resin coating composition onto the fabric base, dipping the coated base into water in order to leach out methanol and calcium chloride from the coating composition and then drying the resultant.

Abstract: An article such as a tote bag is provided with an identifying indicia assembly including a generally transparent pocket of closed construction except for a slotted opening formed at one side thereof for receipt of a thin generally transparent material strip. The pocket, or at least the outer face thereof, is also generally transparent so that individual letters may be adhesively secured to the front face of the strip and be visible through the pocket. The article to which the pocket is secured may thus be personalized. Such articles may include tote bags, purses, combs, and the like.

Abstract: An indicating device such as is used to display automobile service station price data and such as is used as a score board for athletic events includes a suitable mounted base plate (1) (50) in which a plurality of slots (2-9) (51-56) are formed for receiving respectively a plurality of semirigid ribs (35-38) (35a-38a) having rib mounting grooves (42,43) whereby the ribs are slidable longitudinally into the slots, each rib being provided with tape positioning grooves (44,45) for slidably receiving the edge portions of self coiling tapes (29-34) (66-70) on which displayed indicia is applied and the tapes being manually adjustable so as to accommodate changes in the displayed data.

Abstract: An artificially animated face with three-dimensional facial features formed of a flexible material is provided with remotely actuable concealed mechanisms for manipulating the jaw, rounding the mouth, and drawing the lower lip inward relative to the upper lip. The face is operated by an audio input either from a microphone or from an audio tape. The audio input is fed both through an audio amplification system to a speaker located proximate to the face, and also to an audio encoder which senses the major frequencies of the spoken sounds of the audio input and produces one or more digital signals in response thereto. If an "F" sound is detected, the lower lip of the figure is drawn inward to a slight degree, thus simulating human lip movement in sounding the consonant "F". If the decoder detects an "O" sound, the mouth is rounded in response thereto. If the decoder detects an "A" sound, the mouth is drawn into a line.

Abstract: The assembly comprises a frame having end and side frame members, each such member including an outside wall. An inclined rear wall and a front lip extend inwardly from the outside wall. An inside wall extends rearwardly from the front lip and has a rear end constituting a ledge for a glass pane, a picture and the like. Each of at least two retaining strips associated with at least two of the frame members has a side wall carrying an inwardly directed flange and an inclined tongue. A retaining strip is applied by inserting the tongue between the rear wall and the outside wall, then pushing the retaining strip toward such outside wall until the flange rests on the backing for the picture.

Abstract: The invention contemplates improved means of control for a copy holder, for example, a roll-operated positioning device for a data draft or the like sheet to be copied by a typist, so that the eye can be guided correctly on a line-by-line basis. The improved control provides precise electric-motor drive for each of a plurality of selected different paper-displacing increments, at least one of the increments being selectively adjustable to exactly match the line spacing unique to the particular paper from which the copy is to be made.

Abstract: A miniature animated display having figures magnetically coupled to magnets on a trapezoidal plate. A motor driven linkage moves the trapezoidal plate in a manner such that the figures appear to move randomly.

Abstract: A device having indicia announcing an event including an edible item having indicia thereon which includes as part of the indicia the letters "SHE". A walled sleeve includes an opening in the wall thereof of a size when positioned on the item exposes only the letters "SHE" or "HE" of the indicia. The sleeve includes complementary indicia such as "IT'S A" adjacent the opening of the sleeve whereby the only indicia appearing on the item is "IT'S A SHE" when the letters "SHE" are exposed or "IT'S A HE" when the letters "HE" are exposed.

Abstract: A fishing device adapted to be attached to a fishing rod having a fishing line connected at one of its ends to the rod and at its other end to a fishhook includes an inner tube telescoping within and axially aligned with an outer tube which is adapted to be attached to the fishing rod in parallel disposition thereto. A hook device is mounted on the inner tube and is adapted to be attached releasably to the fishing line. A main spring device urges resiliently the tube to an initial position, and a latching device fixes releasably the tubes in a set position against the force of the main spring and frees the two tubes relative to one another in response to a force applied to the hook device via the fishing line so that the tubes return abruptly under the force of the main spring to their initial position, thereby jerking on the fishing line to set the fishhook in place to catch a fish.

Abstract: A portable fishing rod holder and stand including a circular compartmented tray with three spaced depending legs and a sleeved post extending vertically and rotatably at the center thereof. Pivotally and swingably arranged at the upper end of the post is a flat horizontal reel supporting plate having an elongated telescoped supporting pole positioned therein and projecting forwardly therefrom and formed with upwardly extending fishing rod supporting brackets. A rearwardly and upwardly extending bracket on the plate with a spring-pressed clamp receives the handle portion of a fishing rod and, together with the pole clamps, retains the rod in generally horizontal fishing position when a fish is caught on the hooked line thereof.

Abstract: An appendage for a fishhook, with the fishhook having a shank and the shank having a bight at one end and an eye at its other end. The appendage includes an anchor member which is attached to the shank near the eye. At least one torsion member (and typically two) extends transversely from the anchor member near the eye. A latch post also extends transversely from the anchor element at a point remote from the torsion member. An arm is connected in a cantilevered fashion to the distal end of each torsion member. The arm has two normal positions: a relaxed position wherein it makes an angle of at least 15 degrees with respect to the shank, and a "cocked" position wherein it lies more nearly parallel to the shank. The arm is held in its cocked position by temporary engagement with the distal end of its associated latch post.

Abstract: A fishing lure simulating the lifelike swimming motion of aquatic animals composed of at least one strip of flexible material containing at least two components which are essentially rectilinear and which form a variable angle between them.

Abstract: A fishing lure hook up swivel is provided for coupling a ball-like element provided on one end of the fish line to a fish lure whereby the lure can rotate relative to the line. The swivel is provided with a solid body or receiver shaft having at one end thereof a ball recess and a slot leading into a bore for receiving the ball-like element and the line respectively. A coil spring carried by the body provides a removable closure or cage for retaining the ball-like element and line in the recess and bore respectively to permit the fish lure to rotate relative to the line. The other end of the receiver shaft is provided with an "O" ring to which the lure is securely attached.

Abstract: A downrigger release device for use in deep water fishing with a downrigger line includes an elongated body with a connecting line passing through and fixed therein, one end of the connecting line being attached to the downrigger and the other end carrying a pin. The pin is provided with a groove in one end for receiving a fishing line above the lure or bait. When the pin is inserted into aligned apertures in arms extending outwardly from the body of the release device, the fishing line is releasably connected to the downrigger, which is merely a sinker for taking the lure or bait to the desired depth. When a fish strikes, the pin is pulled out of the body by the force on the fishing line to release the latter, the body and pin of the release device remaining on the connecting line attached to the downrigger.

Abstract: A rectangular frame base acts as a lower jaw and is provided with a pair of upper frame type jaws pivoted centrally of the base frame. A hair-pin type spring is engaged around one side of the base and operatively engages the upper frames between same normally urging them from a set position at which position they are substantially perpendicular to the base, to a sprung position at which position they lie substantially upon the base frame. A cruciform trigger assembly is pivotally supported upon one upper jaw and may be detachably engaged with the upper jaw to hold the upper jaws in the substantially spaced and parallel position relative to one another in the set position. The trigger is sprung by movement of same parallel to the base frame or downwardly towards the base frame.

Abstract: A trap for fish, crabs and the like, characterized by a substantial portion thereof being flexible and collapsible for increasing capacity while facilitating storage, safety and handling. The trap comprises an enclosure defined by a large flexible net secured to and communicating with a smaller and substantially rigid base carrying a bait well. Affixed to the net is flotation means whereby the net expands upwardly while under water increasing capacity while properly aligning the base on the underwater floor. Means are provided in the enclosure for baiting the bait well, for entrance of fish, crabs and the like and for emptying the trap. Location and retrieval means are affixed to the trap for retrieval, preferably base first.

Abstract: An automated mechanism for imparting life-like movement to limbs of a mechanical toy. The mechanism has at least a pair of limbs which are moved by a connecting rod and cam. Each limb has a first member pivotally mounted at its one end to a gearbox and the other end to an opposing end of a second member to form joints therebetween and axes of rotation. The connecting rod has its one end pivotally connected to the cam and the other end to the second limb member at a distance from the joint formed between the two members. The cam is connected to a motor through a gear mechanism. Two fulcrum pins are mounted at the end of each first limb member adjacent the gearbox to form a space therebetween with the connecting rod being positioned for movement within that space. The pins act as fulcrums for the rod to transfer a predetermined movement to the second limb member when the rod engages the pins.

Abstract: A machine and method for destroying plant growth. A specialty application is provided for plant growth around and between railroad tracks, and a general description is provided for preventing damage to the high voltage source of electricity used for the plant destruction, and for minimizing the number of fires started in dry material accessory to plant destruction. A vehicle with a high voltage electricity source is mounted on railroad tracks, with wheels of each wheel set for the vehicle being electrically isolated, and the high voltage source being grounded through one of the wheels. Special plant contacting devices comprising rounded end generally cylindrical contacting members are provided. The current output of the high voltage source is limited to prevent damage to the high voltage source, and the no-load voltage of the high voltage source is held to generally the same level as the full-load current limited voltage to minimize the number of fires started by the plant contactors.

Abstract: A hydroponic gardening system and apparatus particularly adapted for small scale use and versatility wherein a steady supply of hydroponic liquid is supplied according to the drip irrigation method to individual plant containers, each of such containers being directly connected through a drain hole and tube in the bottom thereof to a common drain pipe emptying into a liquid reservoir where the liquid is automatically pumped to an elevated tank, the individual plant receptacles being uniquely designed to be very simply removable from the entire system and being rotational in place as well.

Abstract: A crank drives, by the intermediary of a system of cable and pulleys a carriage sliding on a fixed slide bar parallel to the displacement of sliding panels such as windows in an automobile so as to catch a latch and then drive in any direction the panels to be displaced, simultaneously or successively, the latch being part of a mobile slide bar serving as support independently for each of the panels and sliding with the carriage on the fixed slide bar.

Abstract: A window regulator assembly comprises a pair of pivotally interconnected window lifting arms, one of which is pivoted to a panel plate and has a toothed segment attached thereto. The segment engages a pinion driven by a handle and controlled by a clutch, and is cut from strip material by a cropping operation which simultaneously forms teeth in the trailing edge of one segment and the leading edge of the following segment.