Abstract: For locating steel reinforcing members in construction materials, a galvanic cell is formed between an electrode and the reinforcing members by placing the electrode in electrically conducting contact with the construction material. When drilling an opening into the construction material using a hand-held drilling device and the drilling bit in the device contacts a reinforcing member, the potential difference between the electrode and the drill bit can be utilized as a signal for controlling the operation of the drilling device.

Abstract: The power tool has a magnetic base with superposed permanent magnet assemblies. The upper assembly can be moved relative to the lower assembly to subtract from or reinforce the magnetic field. When the sensing probe is pushed into the base the electric motor can be switched on to rotate a spindle on which a rotary cutting tool is axially mounted. The tool feed is controlled by a handle which can be mounted on either side of the tool housing. A coolant reservoir on the base has a hose connected to a pump which is connected to a manifold supplying coolant to the center of the cutting tool. The cutting tool is biased upwardly and pinches off the coolant when the tool is raised from the work.

Abstract: The power tool has a magnetic base with superposed permanent magnet assemblies. The upper assembly can be moved relative to the lower assembly to subtract from or reinforce the magnetic field. The upper assembly is somewhat shorter than the lower assembly so even when the upper assembly is positioned to shunt to subtract from the flux of the lower assembly there will be some magnetic flux attracting the base to a ferromagnetic material. When the sensing probe is pushed into the base the electric motor can be switched on to rotate a spindle on which a rotary cutting tool is axially mounted. The tool feed is controlled by a handle which can be mounted on either side of the tool housing.

Abstract: A chip collecting device for a routing tool is in the form of a hood or box having a wall surrounding part of the circumference of the routing bit. Chips thrown tangentially outwards from the bit are guided by the wall onto an upwardly sloping ramp when they pass into the suction current of a dust aspirating means that acts in an upward direction adjacent to the bit. The chip collecting hood or box is mounted on the lower side of an L-shaped stop in rails. The stop has a passage for the chips placed over the ramp.

Abstract: A transparent enclosure for automatic metal shaping machinery effective to contain cutting fluids, chips, shavings, broken tools and the like having a smooth planar interior wall surface for shedding readily chips, fluids and other matter striking the wall during the course of machine operation.

Abstract: A magnetic base drilling machine includes a base having a magnet coil therein and a motor assembly mounted on the base for driving a rotary cutting tool. Electrical circuitry, including switches for applying power to the magnet coil, for reversing the direction of current to the magnet coil, and for controlling the current to the motor are provided for controlling the magnet coil and motor. A user-manipulatable control handle includes a multi-function control cam having cam surfaces that selectively control the switch that applies power to the magnet coil and which physically blocks operation of the motor switch until the magnet coil is energized. Conversely, the magnet coil cannot be de-energized until the motor switch is moved to its off position. If desired, the direction of the electrical current applied to the magnet coil can be reversed to assist in removing the base from a magnetized work surface.

Abstract: A boring bar assembly comprises a shank portion and a detachable head portion supported thereon for rotary movement. The head portion may carry one or more removable cutting tool inserts for machining. The head portion is pinned in a fixed position on the shank portion by a shear pin. Excessive pressure in machining causes the pin to shear and allows the head portion to rotate on the shank portion and move away from the surface being machined, thus reducing tool breakage and damage to the parts being machined. An axially offset fluid passageway extends longitudinally through both the shank and head portions to direct liquid coolant onto the cutting tool surface. The axial offset of the passageway does not weaken the boring bar in flexure as much as an axial passageway.

Abstract: A unit case having the shape of a hollow cylinder is demountably mounted in a tapered hole of a spindle by use of a unit holding member and a stock suction nozzle is demountably mounted on the tip end portion of said unit case through a cover member. An end of a suction pipe led to the inside of the hollow of said unit case is fixed on the rear end portion of said unit case, and a stock suction means such as a vacuum pump is provided on the other end portion of said suction pipe through a cleaner.

Abstract: Hole punch apparatus comprises a worm and worm wheel whereby an ordinary electric drill can be employed to punch holes in sheet metal by means of a punch and die. The several disclosed structures variously comprise a shear pin for preventing overload, a handle for rapid engagement of the punch and die with the workpiece, bushings to protect against unusual torques, and special threads.

Abstract: A replaceable spindle locking system for a power tool enables an operator to replace a lock member without disassembling the tool. An externally-accessible retaining member, such as a washer, is trapped between a ledge located in a housing recess and a shoulder formed on the lock member, which is normally spring-biased out of engagement with a driven member. The coaction of these elements simultaneously and releasably normally retains both the lock member and the retaining member connected to the housing. When it is desired to replace the lock member, the operator depresses the lock member against the urging of the spring until the lock member is out of retaining engagement with the retaining member. Then the retaining member is slideably moved out of engagement with the lock member, thereby allowing the operator to quickly remove it.

Abstract: An adjustable T-slot cover for covering T-slots in such as a table of a machine tool and consisting of two intermeshing elongated section members. Each section member has in the crosssection a vertically extending web extending along the side wall of T-slots and which web has on the upper end a projection for engaging with chamfered upper edge of the side wall and on the lower portion a guide for resiliently abutting with the side wall. One section member has sidewisely extending first and second arms, and the other section member has a third arm extending between the first and second arms. Intermeshing indentations are formed between the second and third arms.

Abstract: The present invention relates to a multi-purpose tool having particular, although not exclusive, use in conjunction with milling machines in which a drawbar is employed to engage and disengage a tool collet wherein the drawbar protrudes above the machine tool and is rotatable to release and secure the collet. The tool of the present invention combines a socket wrench for rotating the drawbar and a mallet for tapping the bar to free up the collet taper. The tool is dynamically balanced about the axis of the center of mass which is fitted to the protruding end of the drawbar. A handle is provided which is extendable to increase the torque or leverage available to the user and the handle itself is weighted to take advantage of centrifugal force to urge the handle towards its retracted position. A beveled pin or wedge device is also provided to inhibit the lowering of the drawbar with the tool still engaged with the protruding end.

Abstract: A disposable cutting edge to be installed upon a lawn mower rotor and an audible tone generator to warn the operator when the disposable cutting edge is not properly installed. A disposable cutting edge providing a quick and safe snap-on/snap-off installation/removal upon a specially constructed rotor containing an edge positioning sensor, and capable of generating an audible alarm.

Abstract: A dual power tool, such as a jointer/planer, is disclosed in which the cutting head of the tool is mounted on a common shaft which also serves as the rotor shaft for the tool drive motor. This dual power tool is mounted on a single stand and has a switch enabling only one tool at a time to be operated. A retrofit kit is disclosed for permitting a tool owner to convert a single power tool into a dual power tool.

Abstract: A device for automatically limiting the steplessly adjustable speed of a drive motor for the spindle of a grinding machine to a speed which is the maximum permissible motor speed for the grinding wheel currently being used has a motor-driven speed regulator which, upon a stopping of the spindle, returns automatically to an initial position corresponding to the lowest permissible motor speed and has exchangeable protective hoods associated with respective grinding wheel diameters and types which can be releasably secured on the grinding spindle housing. Each protective hood, with the exception of the protective hood for the grinding wheel with the lowest maximum permissible speed, has associated with it a receptacle with several contacts which, depending on the maximum permissible speed for the associated grinding wheel, has two contacts connected by an electrical bridge.

Abstract: An alternate switch actuating mechanism for an electric drill or similar tool which permits the tool to be used in either a portable or stationary operation. The tool has a first handle that includes a first switch actuator for operating the tool and a second detachable handle which carries a second actuator for the switch. The second actuator is constructed so as to directly engage the first actuator to permit simplicity of operation and ease of disassembly for stationary operation. A lock is provided for precluding accidental actuation of the second actuator. The device also includes a reversing switch and an interlock which prevents actuation of the reversing switch when the drill is energized.

Abstract: A machine tool has a pallet transfer system comprising a rotary deck having a pair of pallets oppositely disposed about a vertical rotary transfer axis, wherein at the transfer position, the pallets are further movable along a horizontal linear transfer axis toward and away from the pallet transfer system. A vertical guard plate is affixed to the rotatable section or deck of the transfer system, and the plane of the guard plate passes through the rotary transfer axis at an oblique angle to the linear transfer axis. The rotatable guard plate interacts with an elastomeric seal at the interface of a guard opening in a stationary guard assembly on a machine tool to substantially confine coolant overspray and the like within the machine guard enclosure. By passing obliquely across the linear transfer axes of the pair of parallel pallets, substantially full access of a stationary pallet lying outside the machine guard enclosure may be had.

Abstract: A table for supporting an electric power tool is provided with a safety shut-off device. A bar is pivotably mounted on the side of the table and a shut-off switch is mounted to the table behind the bar. The bar is biased away from the shut-off switch by a spring. If an operator falls or leans against the bar, the switch is actuated to shut off the power to the tool.

Abstract: The drill includes the usual tool spindle driven by reversible motor, and conventional chucking jaws which rotate with the spindle. The jaws are surrounded by an actuator which is drivingly connected to the jaws, and normally rotates with the jaws when the drill is in use. A manually operable control member on the housing is movable between two operating positions in each of which it holds the actuator against rotation, and consequently causes the spindle to move the jaws to bit-locking or bit-releasing positions, depending upon the direction or rotation of the spindle. Whenever the control member is moved from one to the other of its positions it switches the direction of rotation of the motor.

Abstract: A broken bit detector for use in conjunction with printed circuit board drilling machines or the like. The detector includes a light emitter and a light sensor contained within a pressure foot. The light emitter projects a beam of light through a central opening in the pressure foot and toward the light detector. Normally, the beam will be broken by a drill bit which passes through the opening. If a bit is not present, the light beam will not be broken and will be detected by the photosensor. Pressurized air is forced outward from both the light emitter and light detector in order to prevent any chips created by the drilling operation from striking the emitter or detector. The use of the air creates a shield which results in an accurate detector having a long life.

Abstract: A tapping machine having a spindle which is moved reciprocally, i.e., in advancing and retracting direction while being rotated forwardly and backwardly for forming a female screw in a work with a screw tap attached at one end thereof. The machine is provided with driving means including a reversible electric motor, position sensing means for generating a sensing signal when the spindle is moved in advancing direction from a start position so far as a predetermined position, and temperature sensing means for generating a sensing signal when the temperature of the electric motor has risen exceeding a predetermined value. The machine normally repeats a working cycle wherein the spindle is moved in advancing direction from the start position while being rotated in forward direction until it is retracted to the start position soon after a sensing signal from the position sensing means has been generated.

Abstract: An electromagnetic drill stand, of the type having a drill driven by an electric motor and mounted on a stand provided with an electromagnetic coil in the bottom of the stand to secure the stand to ferromagnetic material when the coil is energized, is provided with switch means preventing operation of the motor when the coil is not energized, said switch means being mounted in proximity to said coil and responsive to the magnetic flux of the coil for controlling the power supply to the motor and operative to interrupt the power supply in absence of a predetermined flux density.

Abstract: A magnet base drill unit having a finger thereon frictionally engaging the surface of the workpiece to which the base of the drill unit is magnetically adherred. The finger is movable in response to lifting or sliding of the energized magnet base from the support base of the workpiece to actuate a switch for de-energizing the drill motor. The unit also includes a pointed punch adjacent the rear end of the magnet base which can be in one form of the invention impacted into the workpiece support surface either by a manually operated lever or automatically whenever the drill spindle is retracted from the work to a position near the upper end of its stroke. A second punch may be located on the drill unit rearwardly of the automatically actuated punch. The second punch is arranged to be embedded into the support surface of the workpiece by a manually applied hammer blow.

Abstract: The present invention relates to a safety mechanism for a multiphase forming machine, in which trigger signalling is used to automatically stop the machine by means of the insulation state formed between one leg of a clamp and a stock conveyor to which the clamp is attached as well as whether a nut stock is firmly held by the clamp so as to prevent any part of the machine from being damaged or destroyed.

Abstract: A portable electric router including a housing enclosing an electric motor, and having a router bit extending from one end of the housing and driven by the motor. A router base assembly includes handles and a flat base plate and is adjustably fixed to the housing. The flat plate supports the router for movement along a work surface and is provided with a central opening through which the router bit extends to engage and penetrate the work surface. The other end of the housing has a support surface upon which the router can rest when the router is temporarily put down during use and when it is stored, or while the bit is changed, or while the base assembly is adjusted relative to the housing for depth adjustment of the bit. A switch is provided on the housing for turning the router motor "on" and "off", and is controlled by a switch operator having a portion which extends through an opening in the router housing support surface.

Abstract: A protection device is provided for a machine which works sheet shaped material to stop the displacement of the machine when the protection device encounters an obstacle. The machine includes clamps which are displaced by the machine and which hold the material. The protection device includes two blades arranged parallel to each other and disposed on the machine in a loop shape surrounding each clamp. The two blades form a pair of normally open contacts of which at least the outer blade is flexible and resiliently deformable to allow the blades to be brought into contact with each other and close the contacts when the outer blade encounters the obstacle. A stop device is coupled to the normally open contacts to stop the displacement of the machine when the contacts are closed.

Abstract: The invention relates to a guard for protecting a drilling machine operator from a drill bit mounted in a vertical drilling machine. The guard comprises a multi-part shield which when operative at least substantially surrounds the drill bit, a tubular protecting member adapted to be attached to the quill of the drilling machine and extending downwardly beneath the quill and within the shield, and means for connecting the shield to the protecting member whereby the shield is suspended therefrom, the shield extending upwardly to a height at least equal to the lower end of the protecting member, and at least one part of the shield being movable between its operative position and an inoperative position which allows access to the drill bit. The protecting member is preferably a split ring which is clamped around the quill and the shield is preferably formed of two half-shields of transparent plastics material attached by a slide to the protecting member.

Abstract: A drilling or milling machine has a suction chamber surrounding an axially moveable tool, the chamber being axially moveable relative to the tool and spring biased for abutment against a working surface during machining, after the tool has been fed forwardly in a rapid first phase, then slowly just prior to and during machining. The chamber is composed of two half-shells secured onto a mount on the tool body by a locking ring, and which can be separated by removal of the ring and radial outward movement to provide access to the tool without a need to raise the tool body. The abutment-surface of the chamber may be rigid for laterally-stationary tools, or formed of a ring of flexible bristles for laterally moving tools, e.g. for routing printed circuits. Several compressed-fluid delivery nozzles can be provided in the suction chamber to improve the removal of dust and chippings.

Abstract: The subject safety switch insures that the chuck key has been removed from the chuck prior to operation of the drill press. A slide "on-off" switch is engaged by a guard that prevents the sliding movement necessary to turn the switch on. The guard of the safety switch is not part of the electrical circuit, but rather is a mechanical addition which prevents operation of the electrical circuit. The socket is formed in the housing adjacent the guard. The chuck key is inserted into the socket to engage the guard and remove it from the path of travel of the switch to permit the switch to be shifted between the on and off position. The socket is keyhole shaped, whereby insertion of the chuck key therein will force the chuck to seat within the lower narrower aperture thereof.