Abstract: In circular saws, especially of the so-called cold type, for steel and nonferrous metals, there is a certain play in the gear drive or power transmission between the prime mover such as an electric motor and the saw blade proper. Especially during the start and during the completion of a sawing operation such play causes a temporary stopping of the blade. To avoid such play a brake mechanism with blade engaging brake shoes is provided which is energized and de-energized in response to the current consumption of the electric saw drive motor or in response to position responsive switch means, whereby the brake is effective during the start and during the stopping of the saw blade.

Abstract: Disclosed is a gypsum wallboard panel having kerfing in opposing edges thereof which extends substantially the length of the edges but terminates prior to the corners of the panel a distance sufficient to prevent weakening of the corners of the panels.

Abstract: A method for manufacturing perforated plastic pipes, in particular corrugated thermoplastic pipes of which the wave valleys are perforated by at least one punching member, to which a velocity is imparted in the direction of conveyance of the plastic pipes, which equals the rate of conveyance of these pipes. During the punching operation the punching member or members retain substantially a perpendicular position with respect to the plastic pipes.

Abstract: A method and arrangement is provided for fastening and centering a tool comprising a die element and a punch element, in a press. A centering setup socket is axially displaceable on one tool element and has close fit on the other tool element. The setup socket remaining on said one tool element is retractable from the other tool element by the relative movement of the tool elements.

Abstract: Disclosed is an accounts receivable system of the pegboard or accounting board type, and specifically, one which uses a ledger which has a hectograph-carbon stencil for the transfer of the name and address of the customer to a statement and a statement for receiving the address as the image is transferred from the ledger to the surface of the statement, utilizing a film of hectograph fluid.

Abstract: There is disclosed a method of and apparatus for developing on tape and applying a pre-selected die design, etc., defined by spaced drilled holes, to a die board automatically by a tape controlled apparatus, and to automatically produce properly dimensioned cutting rule for the design. A computer is programmed to produce information which is transferred to a tape, or the like, fed to a numerical control machine to energize selected mechanisms to physically apply a pre-selected design formed by spaced drilled holes, routing, etc., to a die board for reception of spaced tangs or legs of cutting rule, or the like, or other workings. The information from the computer also is utilized, by means of an intermediate tape or the like, to energize a numerically controlled cutting rule machine to automatically produce cutting rule segments of the proper number and length for mounting in the drilled design on the cutting board.

Abstract: A tool assembly in which the tool retainers are provided with spring loaded plungers which snap into place in detents provided in the tools and are then locked in the detents by set screws engaging the shanks of the plungers. This prevents inadvertent displacement of the tools, particularly punches, from their retainers, especially displacement due to jarring or vibration during manufacturing of the tool assembly. The retainers are attached to their respective shoes by bolts having tool engageable sockets in both their leading ends and their heads. This facilitates manufacture of the tool assemblies while permitting replacement of the tool retainers without removing the shoes from the press in which they are mounted. Additionally, a stripper plate may be mounted by means of bolts having tool engageable sockets in either end to permit the plate to be removed from the press without removing the shoe to which the stripper plate is attached.

Abstract: A multicell battery case, adaptable for use with a variety of cell-pack sizes, is molded with universal-sized cell compartments and opposing spacer-ribs projecting a predetermined distance into the cell compartments from the compartments' walls so as to provide an inter-rib gap across the compartment substantially equal to the narrowest cell pack useful with that case. The case is thereafter adapted for use with thicker cell packs by trimming back the opposing ribs to increase the gap therebetween to approximately the thickness of the cell pack actually destined for use with that case. Preferably, rib-shaving blades are inserted into the case and guided in spaced relation from the rib-bearing walls to remove distal portions of the ribs. Means are provided to detach the shavings from the container at their roots.

Abstract: Shrink film perforating unit for perforating thermoplastic film material, for example of the type used to wrap articles which are then subjected to heat shrinking tunnel treatment to shrink the thermoplastic material tightly around the article yet permit captive hot air to escape via such perforations, such unit being in the form of a rotary heated perforator arrangement including rotor having heatable external contact perforation points, e.g. in the form of a star wheel, and a stator with heating means captively received within an internal axial bore of the rotor for heating the external contact perforation points, with sufficient clearance being provided therebetween to permit unhindered rotation of the rotor about the stator, whereby the stator may be stationarily mounted with respect to the rotor and the rotor rotatably mounted so as to be disposable for location crosswise of the path of travel of a movable web of thermoplastic film material, e.g.

Abstract: Two holders are disclosed, one with a downwardly removable retainer, the other with a forwardly removable retainer. The retainer in each case is U-shaped and has aligned openings to receive the long axle. The retainer is so mounted in the holder that an axle slot, oriented perpendicularly to the slot for the retainer, assists in supporting the retainer and cutter wheel axle. Pins extend across the axle slot to further support the axle, cutter and retainer in the holder.

Abstract: An apparatus for use in stripping a continuous web of severable material from at least along a portion of the marginal edge of a body comprising supporting means having a receiving surface upon which the body with the continuous web is advanced along a predetermined path. The apparatus embodies deflecting means pivotally connected to the supporting means for assisting in directing the leading edge of the advanced continuous web vertically so as to facilitate a stripping thereof while permitting travel of the body along the path. Stripping means including a pair of generally longitudinal and cooperating rollers are contemplated as being connected to the supporting means and positioned along the path for grabbing therebetween the vertically deflected continuous web and stripping it from the body in response to the advancement of the body along the path.

Abstract: A machine tool, such as a turret punch, having one or more individual tools positioned in a tool holder member attachable to the turret and easily removable therefrom whereby tools are changed by changing turret tool holder members rather than by changing the individual tool.

Abstract: The specification and drawings disclose a collapsible tap of the type including an elongated, cylindrical body or housing having an axially extending actuating plunger mounted for selective movement longitudinally of the body. The outer end of the plunger has a generally conical portion which functions to provide camming surfaces. Suitable chaser cutting elements are mounted for radial movement in the body. Each element includes a surface in engagement with a corresponding camming surface of the plunger such that axial movement of the plunger produces radial movement of the elements. The elements are maintained in engagement with the camming surfaces by clip members which extend radially from the conical portion of the plunger with resilient, laterally directed terminal portions that engage grooves formed in the sides of the elements.

Abstract: There is disclosed woodworking apparatus which is handpowered but permits accurate cuts by unskilled persons comparable to those which might be made by a radial arm or table saw. The apparatus includes a guide in which a handsaw is retained and restrained for cutting motion along the straight line, a supporting surface to support a workpiece in relation to the handsaw, and guides which co-operate with rulers to permit presetting of the apparatus for a desired cut, together with clamping devices which hold the workpiece to the table securely against the motion of the handsaw, at the same time avoiding interference of the clamps with the handsaw as it passes through the workpiece. The guide for the handsaw is formed of very rigid structural material such as steel angle iron which is faced with a plastic material of moderate hardness that resists abrasion or cutting by the handsaw to a considerable degree but is not so hard as to rapidly dull or distort the teeth of the handsaw.

Abstract: A retainer arrangement is disclosed for securing punches, dies or similar machine tool elements within a bore in a tool holder body, the retainer providing for secure and accurately repeatable orientation of the punch or other element within the bore. The retainer comprises a conically tapered pin retainer having a threaded shank portion adapted to be received into a threaded portion of a retainer seat extending into the holder body transversely to the holder bore and having a conically tapered portion partially intersecting the same. The leading end of the tapered pin retainer is tapered to mate with the tapering portion of the retainer seat and with a complementary conical tapered groove formed in the punch shank, to securely retain the punch or other machine element within the holder body, and also to precisely and repeatably orient the same with respect to the holder body bore in receiving the same.

Abstract: An apparatus for handling articles, in particular a tray for supporting long flexible material before, during, and after being automatically machine cut, automatically clearing the cut material from the machine such that the cut material is cleared in a "nontangling" manner, and the tray automatically returning to its starting position to support the next material to be cut.

Abstract: Apparatus for automatically applying flexible strips around objects consists essentially of a guide for the objects, the cross-section of which is substantially equal to that of the objects, means for sequentially introducing at least one object into the guide at one of its ends, means for feeding a flexible strip in front of the said end in synchronism with the arrival of the object and means cooperating with the said guide for folding down the ends of the strip on the rear face of the object.

Abstract: An automatically retractable slitter for cutting thermoplastic sheet as it exits from the sheet die of an extruder comprising a housing, a cutter blade mounted in a holder, a recess in the housing of a length greater than the length of the holder for slidably and retractably receiving the holder and blade, an elongated slot in said housing having detent means, an elongated pin secured to said holder and extending transversely through the elongated slot, spring means between the holder and the housing adapted to be relaxed when the holder is in its retractable position within the recess, the pin being adapted to rest in the detent when a cutting force is applied to the blade and to disengage from the detent when no force is applied to the blade.

Abstract: Apparatus for cutting rolled steel sections with a web and one or more flanges angled in respect to the web as profiled cutters movable relative to each other on a common axis and kept parallel to each other at the time of cut. The cutter edges for cutting the web of the section extend in an inclined manner at an acute angle with respect to a plane at right-angles to the axis of travel of the cutters. These cutter edges which extend to follow the shape of the flanges at least as far as these extensions are located inside the projection of the section on the normal plane.

Abstract: A method for automatically varying the feed rate of a moving workpiece carriage in the proximity of permissible terminal positions for the carriage in a machine tool. The machine tool includes a numerical control means for controlling the position of the workpiece carriage and means for determining the position of the workpiece carriage in the machine tool. The improvement comprises storing signals corresponding to a plurality of safety positions of the workpiece carriage located within the terminal positions of the carriage in a memory device provided in the numerical control means. The safety position signals are then compared with measured position signals generated by the position determining means which correspond to the position of the workpiece carriage in the machine tool. The feed rate of the workpiece carriage is automatically reduced by the numerical control means when the safety positions are passed by the workpiece carriage as the carriage moves in a direction towards the terminal positions.