Abstract: A progressive die for forming a turbulator having multiple rows of axial corrugations. The corrugations are slit and offset such that artificial turbulence is generated as it passes through the corrugations. The device includes a plurality of dies disposed along an axial material direction. A flat strip of material enters the dies and is folded about its longitudinal axis in a relatively wide V-fold. As the strip of material moves forward, it is intermittently stamped in the series of dies. The initial dies create a central V-shaped fold that gradually narrows into a U-shaped channel with straight walls. Once the first corrugation is formed, a series of progressive dies form the remaining corrugations in alternating fashion. Next, the material moves through a slitting station that provides apertures and an axial offset such that adjacent sections of the corrugation are slit and offset in the axial direction.

Abstract: A method and tool for forming convexities (3, 4) in a plate body (1), which plate body (1) comprises a main face (2) and a plurality of side edges. The plate body (1) is inserted between two tool halves (11, 12), which are brought together and interact to press a first set of convexities (3) in a first direction relative to the main face (2) of the plate body (1) and a second set of convexities (4) in a second, opposite direction relative to the main face (2) of the plate body (1). The convexities (3, 4) are formed along a straight line across the plate body (1) between two of the side edges thereof.

Abstract: Provided is a press die for molding a sipe blade which can efficiently mold a sipe blade having a complicated shape such as three-dimensional shape and having excellent mechanical strength characteristics and which can reduce production cost due to its simple structure, and further provided is a method for simply and efficiently making a press die for molding a sipe blade having a complicated shape such as a three-dimensional shape by a casting method.

Abstract: A tube and turbulator and method of making the same for a heat exchanger including a base, a top spaced from and opposing the base, a first side interposed between the base and the top along one side thereof, and a second side interposed between the base and the top along another side thereof. The base, top, first side and second side form a channel. The second side is triple hemmed such that ends of the base and the top are disposed within the channel. A flat turbulator may be disposed inside the tube and includes a base extending laterally and longitudinally in a strip. The flat turbulator also includes a plurality of corrugations spaced laterally along the base and extending longitudinally and generally perpendicular to the base in an alternating manner. The corrugations are rolled in a direction parallel to a longitudinal axis of the strip.

Abstract: A method and tool for forming convexities (3, 4) in a plate body (1), which plate body (1) comprises a main face (2) and a plurality is of side edges The plate body (1) is inserted between two tool halves (11, 12), which are brought together and interact to press a first set of convexities (3) in a first direction relative to the main face (2) of the plate body (1) and a second set of convexities (4) in a second, opposite direction relative to the main face (2) of the plate body (1). The convexities (3, 4) are formed along a straight line across the plate body (1) between two of the side edges thereof.

Abstract: A device for simultaneously forming multiple notches in opposing surfaces of a hollow workpiece in a single action. The device includes a first die and a first punch that is fixed relative to the first die. A second die and a second punch are fixed relative to each other and movable relative to the first punch and first die. In response to movement of the second die and second punch, the first die cooperates with the second punch to form a first notch in the first surface and the first punch cooperates with the second die to form a second notch in the second surface.

Abstract: A power assisted combination shear used for forming structural louvers in the crimped seam of structural steel decking comprises a frame supporting a pair of jaws which are opened and closed by means of an operator-controlled pneumatic cylinder. One jaw terminates in a blade and the other jaw has a corresponding die member. The blade and die have undercut reliefs in the root portions, which permit the louver to be formed without breaking through to the edge of the seam. The louver comprises a sheared portion in the form of a bowed tab bridging a corresponding window formed in the seam by the shearing of the tab. The interference between the louver and window provides a substantial increase in the lateral resistance (shear strength) of the crimped seam, thereby obviating the need to additionally weld or screw the seam to provide the necessary shear strength for even the highest stress applications.

Abstract: A magnetic head 1 provided with head chips 3 at distal end portions 2a of base plates 2. A punch 12 is abutted against each of the base plates 2 which is placed on a die 11, and a shearing force is applied to the base plate to plastically deform the distal end portion 2a, whereby adjustment of the height can be conducted while the sliding face of the head chip is kept in parallel to a reference track plane.

Abstract: A sheet metal cutting and forming tool is used in preparing the ends of square sheet metal tubes used in building construction as framing struts and studs. The tool receives a tube end axially wherein four cutting edges sever the tube at its four corners. Two opposing curved surfaces force two corresponding opposing sides of the tubing to roll up inside the tube, while two alternate curved surfaces force the alternate corresponding opposing sides to move outwardly into slots or onto laterally oriented guide surfaces. The resultant tube end provides opposing and axially or laterally extending sides spaced apart for receiving a second tube of the same size wherein the alternate sides may be fastened to the second tube sidewall while the rolled-up ends provide great rigidity, or alternately the lateral tube ends are easily fastened to a wall or similar surface.

Abstract: A selected portion of a surface of a metallic workpiece such as the end surface of a tubular workpiece, is provided with one or more recesses by resorting to a tool having a preferably pointed tip and being driven into the surface to displace the material of the workpiece substantially transversely of the thus obtained recess. The latter can be used to facilitate the establishment of a separable connection between the workpiece and a substantially disc-shaped section of a cover or housing in a friction clutch for use in motor vehicles. The tool can be left in the recess to serve as a locating or centering device for the workpiece.

Abstract: A laundry machine drum has a sheet material skin including an arrangement of a plurality of perforations therethrough. Each of one or more of the perforations includes a shear cut in the sheet material. The sheet is deformed in the region of the shear cut such that the edge of the sheet material of one side of the shear cut is offset from the edge of the sheet material of the other side of the shear cut over at least some of the length of the shear cut. An opening is formed between the offset edges. The apparent area of the opening is greater when viewed from at least one direction substantially parallel to the general plane of the drum skin in the region of the perforation than when viewed from a direction substantially perpendicular to the general plane of the drum skin in the region of the perforation.

Abstract: The cutting edge of a die and the cutting edge of a punch are spaced more widely from each other in a range of an element which includes a neck and undercuts than in the other range of the element. The element is blanked out of a metal sheet by the die and the punch. Edges of the neck and the undercuts are formed of a sheared surface in a transverse direction and a ruptured surface contiguous to the sheared surface. A burr is formed next to the ruptured surface in a position out of contact with endless rings.

Abstract: A workpiece blanking apparatus has a die, a pad for holding a plate of metal on the die, a blanking punch for depressing the plate on the die downwardly of the die to blank a workpiece out of the plate, and a counterpunch vertically movably disposed in the die in confronting relationship to the blanking punch and movable downwardly with the workpiece blanked by the blanking punch. A counterpunch urging device normally urges the counterpunch upwardly, and a holding mechanism holds the counterpunch in a lowered position after the workpiece is blanked by the blanking punch until the blanking punch is spaced from the workpiece, the pad is spaced from the plate, and the blanking punch and the pad are lifted to a predetermined position. The holding mechanism releases the counterpunch in the lowered position and allows the counterpunch to displace the workpiece out of the die when the blanking punch and the pad are lifted to the predetermined position.

Abstract: A progressive die for forming a turbulator having multiple rows of axial corrugations. The corrugations are slit and offset such that artificial turbulence is generated as it passes through the corrugations. The device includes a plurality of dies disposed along an axial material direction. A flat strip of material enters the dies and is folded about its longitudinal axis in a relatively wide V-fold. As the strip of material moves forward, it is intermittently stamped in the series of dies. The initial dies create a central V-shaped fold that gradually narrows into a U-shaped channel with straight walls. Once the first corrugation is formed, a series of progressive dies form the remaining corrugations in alternating fashion. Next, the material moves through a slitting station that provides apertures and an axial offset such that adjacent sections of the corrugation are slit and offset in the axial direction.

Abstract: A cutting edge is formed by build-up welding on a die of a die assembly made of a base material of an aluminum/copper-based zinc alloy. The cutting edge comprises an underlying layer and an overlying layer. The underlying layer is made of a copper alloy that can be welded to both a zinc alloy and a nickel alloy, and the overlying layer is made of a nickel alloy. The cutting edge is of high machinability, high durability, and high hardness.

Abstract: A magnetic head 1 provided with head chips 3 at distal end portions 2a of base plates 2. A punch 12 is abutted against each of the base plates 2 which is placed on a die 11, and a shearing force is applied to the base plate to plastically deform the distal end portion 2a, whereby adjustment of the height can be conducted while the sliding face of the head chip is kept in parallel to a reference track plane.

Abstract: The J-channel siding tool is preferably used to cut tabs or notches or a miter finishing cut in J-channel vinyl or aluminum siding in perpendicularly adjacent pieces proximate to the corners of doors or windows of a building, through the one cut operation of the tool by an individual. The J-channel siding cutter includes a pair of pivotally interconnected handles, a first cutter having a pair of first cutting surfaces and a first traverse cutting surface on one of the handles, and a second cutter having a pair of second cutting surfaces and a second traverse cutting surface on the other handle. The second traverse cutting surface is recessed with respect to the first traverse cutting surface to enable an individual to selectively determine, in one cut, whether to create a tab or notch within J-channel siding. The first cutter may also include a stop for defining a uniform length of tab or notch.

Abstract: A clutch housing for use in a transmission is generally cylindrical or cup-shaped and has an open end. Axially-extending inner planar portions and outer planar portions are alternately disposed about the periphery of the clutch housing. Angular planar portions are disposed between the inner and outer planar portions and are continuous with the inner and outer planar portions. A retaining member is formed on each inner planar portion by lancing each inner planar portion and inwardly displacing a portion of the inner planar portion adjacent the lance. Preferably, the lance is arcuate in shape, with the arc centered toward the open end of the clutch housing. The displaced portion is formed into a retaining member, which has for its shape two generally planar, generally triangular sidewalls and a generally regular-trapezoidal wall. The trapezoidal wall has a long parallel edge and a short parallel edge.

Abstract: A punch for forming a slugless, pierced conical extrusion in a sheet metal panel. The punch has a cylindrical shank with a hole-forming portion at one end. The hole-forming portion includes a cylindrical extruding portion axially outwardly of the end of the shank and a cylindrical piercing tip axially outwardly of the extruding portion. The piercing tip has an outer end formed with a flat radial surface perpendicular to the central axis of the punch and a flat ramped surface extending at an acute angle to the radial surface. The acute angle is in a range from 40.degree. to 50.degree. preferably 45.degree.. Upon initial axially outward advance of the punch, the piercing tip punches a hole in the sheet metal panel leaving punched-out material attached at an edge of the hole. Upon further axially outward advance of the punch, the extruding portion forms a conical extrusion around the hole. The hole is pierced, coned and extruded in one continuous stroke of the punch.

Abstract: A device for forming a spout in a container (8) such as a can or the like, comprises a pressure element (11) for introduction into the container (8) and a cutting element (10) for engagement at an outer side (26) of the container (8) which move towards each other in the manner of a pliers to capture the container (8).

Abstract: A shearing machine includes a sickle shaped upper jaw interacting scissors fashion with a generally linear lower jaw. The distal ends of the sickle shape begin shearing from opposite ends of a plate-type object at about the same time, with shearing progressing toward a central point. A transverse member and a return leg form, with the lower jaw, a J-shaped device. The upper jaw slides within the return of the J during the entire cutting operation, thereby overcoming any tendency for jaw spreading between the linear and sickle shaped cutters. A front cutting insert in the transverse member and a return cutting insert in the return leg, interact with a tip of the upper jaw to pierce, and then cut, a plate which is longer than the throat of the shearing machine, thereby enabling shearing of large plates. The initial piercing takes place simultaneously at the tip of the upper jaw and at an upward-directed point on the front cutting insert.

Abstract: A hand-held portable power tool for use in an operation for joining and fastening two or more abutting steel plates, the tool comprises: a housing unit; a clamp, a punch, a power mechanism and a punch actuator. The clamp is mounted on the housing unit and is movable from an open position to a clamped position. The clamped position is a position that enables the clamp to hold the abutting steel plates together and prohibit them from moving in relationship to each other. The punch is mounted within the housing unit and has a hollow ground chisel shape. The power mechanism is engageable with the punch and the clamp. The power mechanism is of sufficient capacity to clamp and hold the abutting steel plates together and to drive the punch through the abutting steel plates. The punch actuator is actuatable from an off position to an on position.

Abstract: A tool for manufacturing signs wherein selective sign display elements are retained in a base profile section by folded engagement of opposite end portions of the base section. The tool includes members for cutting the base section, compression members for deforming the base section to secure the sign elements from disengagement with the base section and a punch for providing an aperture in the base section. The tool further includes a guide surface for positionally aligning the base section and gauge blocks for displacing the guide surface generally perpendicular to a longitudinal axis of the base section to accommodate respective base sections having different width dimensions. A stop member restricts movement of the sign display elements when cutting the base section.

Abstract: A roll forming tool for manufacturing louvered serpentine fins. The tool has a plurality of fin blades each having a predetermined size and shape. Each of the blades has a plurality of cutting edges for forming scallops in a serpentine fin such that a louvered serpentine fin is formed. The blade forms the louvers in the fins that create a turbulent air flow and thus increase the rate of heat exchange in a heat exchanger.

Abstract: A crimping and cutting device for use on pipes comprises a frame (1 ) provided at one end with an anvil (4) to locate a pipe (P) during a crimping and cutting operation. The device includes a crimping head (18) and a cutting blade (28) which are movable towards the anvil (4) by, respectively, first and second hydraulic actuators (11, 13). The two actuators are mounted coaxially on the frame (1), with the first actuator (11) being operatively connected to the second actuator (13). In operation, the first actuator (11) is operated to move the second actuator (13) which, in turn, moves the crimping head (18) so as to compress the pipe against the anvil (4). Then the second actuator (13) is operated to move the cutting blade (28) through a passage (35) formed in the crimping head (18) so that the blade cuts through the compressed region of the pipe (P).

Abstract: A double scissors cutter for cutting a workpiece into substantially rectangular pieces is provided which comprises a pair of jaw members adapted to be opened and closed about a pivot shaft. Each of the jaw members includes, attached thereto, a cutting blade on an abutting surface thereof, the cutting blades being of a substantially U-shaped configuration. The cutting blades are arranged to be inter-engaged with each other with one of the cutting blades being positioned within the other of the cutting blades, so that a workpiece positioned between the cutting blades may be cut in a scissors cutting movement of the jaw members to form cutout pieces of a substantially rectangular configuration. Protuberant structure is carried on one of the jaw members and extends beyond a plane in which the cutting edge of the associated cutting blade lies.

Abstract: A method of shearing a thin metal sheet having a thickness of approximately 0.1 mm or less so as to be separated into a product and scrap by a pair of dies. A chamfer or a round having a size of approximately from 5 to 10 times greater than the thickness of the thin metal sheet is arranged at the lip of a first die which presses one portion of the thin metal sheet which is to be scrap. A chamfer or a round is not substantially arranged at the lip of a second die which presses the other portion of the thin metal sheet which is to be a product. A backing material and the thin metal sheet are overlapped so as to be a laminate. The backing material has a thickness of approximately 2 times or more greater than that of the thin metal sheet and is formed of a flexible material having a very small elongation and is soft enough not to substantially prevent the thin metal sheet from being sheared, such as, for example, paper.

Abstract: A tool for use in preparation of signs of the type having a base section and sign elements engaging therewith comprises two members (7, 8) movable with respect to each other. These members comprise on one hand edge components (9, 10) for cutting the base section off, and on the other components (11) for deforming the base section so as to create obstacles for the sign elements to leave the engagement with the base section.

Abstract: Steel fibers which commonly are comprised of a straight center section and S-shaped end sections are commonly produced in two manufacturing steps: In a first manufacturing step straight sheet steel strips are cut from sheet steel and the resulting steel fibers are then stamped to produce the desired final shape. A method is suggested which combines the stamping and cutting of the fibers into one single manufacturing step. For this purpose, the upper or lower cutting blades are provided with a respective cutting contour which corresponds to the desired final shape. The cutting edge contour has a parallel leading center section in the direction of cutting that is parallel to the surface of the sheet steel. The two end sections are recessed and have a wave-shape or flat S-shape.

Abstract: An elevated card guide is integrally formed in a card cage in a process using a press, a sheet of raw material, and a tool for forming a plurality of features having at least three levels. In one embodiment, the card guide includes several multi-level bridges with at least three levels in each bridge. In another embodiment, a lead-in is formed in at least one end of at least one horizontal bridge in the multi-level bridges. Still another embodiment incorporates at least one landing in at least one of the horizontal bridges. Lead-ins and landings may also be incorporated into one or more multi-level bridges. The tool includes a male portion and a female portion which cooperate simultaneously. The tool is able to accurately dimension a part in total compliance with required specifications and all printed circuit board designs. A method of forming a plurality of multi-level features uses the press, the sheet, and the tool to form complete features in a single stroke step using the single tool.

Abstract: A method for cutting and separating from a piece of sheet metal a product, comprising a first step for contouring the product while leaving a small joint such as a connecting web or micro-joint which connects the product to the sheet metal, a second step for forming a protrusion on or adjacent to the small joint by lancing, embossing, or semi-shearing, and a third step for pressing the protrusion in order to shear the small joint.

Abstract: A compound sheet with a welded seam is arranged on a table (2) of the device (1). By lowering a cutting and bending punch (4), a cutout is cut from the compound sheet and bent downwards. A pulling device is arranged inside the device (1) underneath the table (2) to seize the downwardly bent cutout and tear it off the compound sheet. The quality of the weld can be evaluated by visual inspection of the appearance of the rupture point, in a known manner. In this way, tear test specimens of consistent quality and informativeness can be prepared very quickly and easily.

Abstract: A wall rail of iron or metal material provided with a series of openings which are produced by pressing back the plate material between a transverse section. Both the pressback parts and the plate parts which remain standing between the transverse sections are configured with an arcuate or polygonal cross-section. The profiled areas extend over the entire breadth of the supporting side, and the material is formed approximately symmetrically out of the plane of the plate.

Abstract: Metallic card clothing is illustrated having sharp metallic points C at tips of teeth 32 formed by punching and thereafter exerting a mechanical force bending metal over at the tips of the teeth.

Abstract: A hand-held punch pliers for simultaneously punching and connecting overlapping sheet metal as at the corners of overlapping ceiling tile grids and the like comprising a die handle to which a hollow die is affixed, a punch handle to which a punch is affixed. The punch is sized for insertion along an arcuate path into the die. A joint pivotably connects the die handle to the punch handle such that the die and the punch are moveable in arcuate paths about the joint into and out of punching engagement by manually squeezing and releasing the handles.

Abstract: An insulation displacement terminal having a pair of slotted plates retained in a nest formed by embossments on sidewalls extending past the edges of slotted plates. The sidewalls and the slotted plates are formed orthogonally upward from a common base. Outer ellipsoidal embossments are formed on opposite sides of a cylindrical embossment. The embossments are formed by a shallow drawing process without removal of material from the planar sidewalls. Adjacent edges of the embossments are sheared to form a nest receiving the side edges of the slotted plates.This application is a Divisional of application Ser. No. 07/280,753 filed Dec. 6, 1988, now U.S. Pat. No. 4,948,382, issued Aug. 14, 1990.

Abstract: In a method for the bending of workpieces by swivel bending jaws, the bent-off part is to assume a predetermined bending angle with respect to the workpiece, for this purpose, in a first bending operation, at least one corresponding leg is to be bent off from the workpiece by means of the swivel bending jaws. Then, the swivel bending jaws are released from the leg and a springback of the leg or the actual bending angle is determined by direct measurements and compared with a set bending angle. Subsequently, an agreement is established between set bending angle and actual bending angle by a renewed bending operation, by a bending-over.

Abstract: A cutting blade for use in a ram operated system for strategically cutting out tubing to facilitate bending thereof. The cutting blade has: first and second walls arranged in a V-shape, with each having a leading end and a trailing end; first and second substantially straight shearing edges on the leading ends of the first and second walls and residing substantially in a single plane; a planar entry surface angularly disposed with respect to the plane of the shearing edges; and an elongate, substantially straight, ridge at the apex of the V-shaped walls and defining, in conjunction with the planar entry surface, a leading tip on the cutting blade for penetrating a tubing piece.

Abstract: A precision apparatus for controllably shearing a thin workpiece of material to make devices such as electrical contacts of the character having specially configured spaced apart tongues adapted to mate with plug connectors of standard design. The apparatus is designed to rigidly support the workpiece except in the precise area of the shear during the entire shearing step.

Abstract: A precision apparatus and method for controllably shearing a thin workpiece of electrically conductive material to make electrical contacts of the character having specially configured spaced apart tongues adapted to mate with plug connectors of standard design. The apparatus is designed to rigidly support the workpiece except in the precise area of the shear during the entire shearing step.

Abstract: A hand-operated rebar bender, bent rebar straightener, and rebar cutting machine which includes a base, a pair of spaced apart bending posts, and a linearly reciprocable slide disposed between the posts and movable reciprocally in directions perpendicular to a line interconnecting the posts. The slide defines first and second grooves, both adapted to receive the rebar, which move with the slide. The grooves are positioned so that the straight rebar to be bent and the inclined legs of bent rebars to be straightened can be positioned tangent to the post. The base includes a guideway for the slide and, in one of its first and second positions, an end of the slide projects past the guideway. A rebar cutter defined by a frame releasably connected to the base includes a pair of rebar cutting discs having aligned, peripherally open grooves, one of the discs being fixed and the other being rotatable relative to the one.

Abstract: An apparatus for cutting and crimping pipe having a first jaw and a second jaw between which a pipe is placed to be crimped and/or cut. At least one of the first jaw and the second jaw is mounted for relative reciprocating movement toward and away from the other, whereby the jaws are capable of cutting and crimping pipe placed therebetween. A guide mechanism, preferably a guide plate, is disposed at an angle to the jaws for guiding a pipe placed between the jaws, whereby the pipe can be cut and crimped at an angle determined by the angle of the guide mechanism. It is preferable that the jaws have a first section provided with a mechanism for cutting and crimping pipe and a second section without a mechanism for cutting pipe whereby pipe placed in the second section may be crimped only. Preferably the first jaw is driven by a hydraulic ram.

Abstract: A method of producing concentric knockouts on a planar portion of sheet metal to be formed into an equipment housing. The sheet metal is successively positioned with respect to punch sets of increasing diameter and knockout portions of increasing size are sequentially cut, but for retaining anchors, to surround previously cut portions. Successive knockout portions are cut by punches moving in opposing directions. The punch sets comprise a cutting punch and an embedding punch. The cutting punch cuts and displaces the knockout in a first direction and the embedding punch of the same punch set moves in an opposite direction to at least partially restore the cut and displaced portion within the surrounding portions of the sheet metal.

Abstract: A method is disclosed for producing contact pins having a mounting portion including three resilient legs. The mounting portion permits solderless mounting of the contact pin in plated-through holes of printed circuit boards. In a single combined stamping and cold extrusion operation, the three legs are brought to a position in which they make an angle of 120 degrees with each other. A die used for the production process includes a female and a male part. To form a first leg of the mounting portion, a punch in the male part is lowered into a corresponding slot in the female part. To form the two other legs, material from the shank of the contact pin is displaced by inclined surfaces of the female part into two recesses corresponding with these surfaces, the recesses being located at the two long sides of the punch in the male part.

Abstract: A precision apparatus for controllably shearing a thin workpiece of electrically conductive material to make electrical contacts of the character having specially configured spaced apart tongues adapted to mate with plug connectors of standard design. The apparatus is designed to rigidly support the workpiece except in the precise area of the shear during the entire shearing step.

Abstract: A component lead tip protruding from a hole of a circuit board is split and displaced in order to attach the component to the circuit board. Trimming of the lead to a preferred length generally simultaneously with the splitting is also possible.

Abstract: A crimp cutter blade for gripping and cutting out a top end portion of a terminal wire, in which depressions or recesses are formed on a pair of opposing arms between crimping portions for crimping the terminal wires of electronic parts or the like and cutting edges for cutting them, respectively. The depressions absorb upward drift of the terminal wires which is caused by the crimping and cutting of them.

Abstract: A method for quickly manufacturing a connector plate of varying design strength in a minimum size plate for joining wooden members which approximates the ideal connector plate for that particular design, thereby making it unnecessary to use plates of greater strength than required. The plate is produced with a controlled number of teeth extending transversely outwardly from one major side of the plate in varying patterns. The new and improved method includes feeding sheet metal stock of predetermined width through a die having a plurality of punches that are controlled for relative movement with respect to the stock, striking the sheet metal plate with the die at predetermined intervals to form the particular desired pattern of teeth extending from the plate and leaving a plurality of longitudinally extending slots formed in the plate, and cutting the plate when the desired total length of the plate is reached.

Abstract: An elongated wall formed substantially of metallic material. The wall includes a first surface and a second surface spaced from the first surface. A plurality of spaced knockout portions are disposed in incipient apertures extending through the wall and these knockout portions are adapted to be selectively removed from the remainder of the wall by application of force to the portion to be removed. This force could be applied as by subjecting the knockout to a sharp blow directed to the portion. Each knockout portion so completely fills its corresponding aperture as to render the wall substantially impervious to the passage of fluid. The wall further comprises a coating applied to one of its surfaces. A method of forming the wall is also disclosed.

Abstract: A cutter-bender tool for the cutting and bending of resistor leads is described. The cutter-bender tool is simple to operate and involves an operating procedure whereby the resistor is simply dropped into a slot and a handle is depressed. Upon release of the handle, the finished, trimmed and bent resistor drops from an outlet slot in the bottom of the tool.