Abstract: A dual-in-line switch package having a plurality of momentary contact switching stations and a plurality of indicating lights is disclosed. The switching mechanism of the switches is provided by a close wound coil spring having one end that encloses one contact and another end that is bent by the depression of a pushbutton so that it makes contact with a second contact in order to complete the circuit. The indicating lights may be light-emitting diodes which have lead extensions that are brought out of the package in line with the contacts for the switches. The light-emitting diodes rest on a support guide rail and are held in place in the switch when the cover is snapped on.

Abstract: A keyswitch for a keyboard which may generate either a first signal or a second signal is formed by a pair of saturable magnetic cores and corresponding drive and sense line wires that are molded into a unitary support assembly in a keyswitch housing. A plunger and a magnet assembly that is depressible relative to the housing and which supports at least one permanent magnet and a pair of compressible springs allows for the unsaturation of one core and the compression of one spring upon depression of the plunger to a first position and for the unsaturation of the second core by the compression of the second spring upon further depression of the plunger and magnet assembly to a character second position.

Abstract: A one-piece split shank through bore plastic screw grommet for use in a round hole and which will not spin when a screw is introduced into the bore. In this fastener the size of the shank exceeds the hole to such a degree that when a drive pin having crushable ribs is driven into the bore to expand the shank there are sufficient forces exerted on the wall of the hole to prevent rotation of the screw grommet when the torque of the screw is imparted to the grommet as threads are formed in the bore by the screw.

Abstract: An expansion anchor device for use in masonry structure which is capable of drilling a hole in the structure and being set without the necessity of removal of the device from the hole. A drill tip portion with a conical upper region is interconnected to a generally cylindrical sleeve portion through a frangible wall. Helical flute grooves are formed on the outer surface of the sleeve to permit exhaust of drilled material from the hole.

Abstract: A spring washer unit with sealing capabilities with an inner dish-like spring washer section having a lower load bearing surface located radially inwardly of the outer margin of the washer. The region between the outer margin of the washer and the load bearing surface forms a recess within which a sealing ring is positioned so that the load on the washer is carried on a minimum diameter and bolt load is not effected by cold flow of the sealing ring since the sealing ring is not clamped between the load bearing surface and the workpiece.

Abstract: Disclosed is a plastic device for supporting cords and other elongated bodies which device essentially comprises an atoll-shaped main body having an opening, a pair of flexible door members protruding from the edges of the opening toward the interior of the main body and intersecting each other for thereby shutting the opening and an anchor piece to be inserted into an aperture of a plate. In use, the plastic device is fixed by pushing and inserting the anchor piece of the device into an aperture of a plate, and a bundle of wires are pushed against the intersecting door members so that the door members are yieldingly opened, thus allowing the bundle of the cords to enter the inner space of the atoll-shaped main body. Then, the door members are restored to the original intersecting position, thus preventing the cords from slipping out of the inner space of the main body.

Abstract: A one-piece plastic latch receptacle mounted in an apertured panel and adapted to accept a shouldered strike. The latch includes a resilient oval tubular portion supported in spaced independently flexible relation to both the head and mounting legs and carries at least one shouldered rib positioned along each major dimension of the oval for engagement of the strike at a plurality of positions.

Abstract: A plastic clamp is provided for tightening a bundle of thread-like elements. This clamp is of the type comprising a head having a passage therein and an integral strap provided with ratchet teeth which, as the strap is passed around the bundle and threaded into said passage, engages a pawl formed in the passage integrally with the head. The pawl is connected to the head through a pair of coaxially extending pins formed on two opposite sides of said pawl.

Abstract: A linking device is disclosed which comprises a connecting strip, a main trunk section formed integrally at each end of said connecting strip and an engaging member formed by extending the forward perpendicular end of said each main trunk section into an inserting and engaging portion integrally incorporating a hook element of the shape of a hook.

Abstract: The invention relates to straps which include an elongate strap portion, a housing at one end of the strap and a screw member which is adapted to be positioned in the housing to draw the strap portion through the housing. In particular, the invention relates to straps which are easily drawn to a predetermined tension about an article by means of a screw member having a weakened section between the head and the threaded shank. The weakened section fractures when a predetermined torque on the screw member is reached, preventing overtightening and also indicating that the required tension in the strap portion has been reached. The screw may have two heads, the second head being revealed when the first breaks off, to permit the strap portion to be released. Straps according to the invention may also be used as security seals, if no second head is provided, as then the strap must be broken to be removed.

Abstract: A one-piece plastic closure device for use in a filler hole, i.e. an oil filler cap or crankcase vent means, which seals the hole from the outside and can be applied with a fractional turn of the closure. The closure is adapted for use in a panel with an aperture having communicating lateral slots which telescopically accepts spring controlled retainer pads extending laterally from the closure body and that are moved to underlying relationship with the panel by rotation of the closure; the spring means acting on said retainer pads insuring continued sealing engagement of the closure with the panel.

Abstract: Disclosed is a switch structure for use in a gas-fired appliance. The switch is simultaneously operated by rotation of a gas valve on an appliance such as a cooking stove. The switch has a semi-circular cam body disposed within a housing. The cam body is secured to the stem of the gas valve for rotation therewith. An arcuately extending cam guide is located on the periphery of the body and extends transversely of the axis of rotation. A cam lobe is also provided on the cam body immediately adjacent the cam guide and only at one side thereof. A flexible wire contact element is engagable with the cam guide and is actuated by the cam lobe to make electrical contact with a stationary contact element when the cam body is rotated in one direction. The flexible wire contact is engagable with the cam guide and directed away from the cam lobe to avoid electrical connection when the cam body is rotated in the opposite direction, during, for example, turning off and/or adjusting the level of the flame of the gas burner.

Abstract: Multipackaging devices made of a resilient plastics-material such as low density polyethylene. The devices are made in strip form and are integrally interconnected longitudinally of the strip for continuous machine application to adjacent rows of containers with selective transverse severance of the applied strip to form individual packages of selected members of containers. The strip comprises a row of bands along each side thereof with intersecting and diagonally arranged substantially straight-line band segments extending between the side bands. The band segments cooperate with each other and with the side bands to define additional intermediate bands between the side bands. The strip is substantially narrower than the width of the rows of containers so that substantial transverse stretching of the strip is required to apply the side and intermediate bands to the rows of containers.

Abstract: A thermal switch for automatically opening a circuit when the ambient temperature is increased to a predetermined level. A pair of conductor wires are arranged in side by side fashion with extremities extending in the same direction. A spring portion is included in at least one of the conductor wires to provide stored energy when the spring is biased into electrical contact with each other. A localized contact region is included in the conductor wire in the region below the spring portion. The extremities, contact region, and spring being encapsulated with a heat fusible material which biases the conductor wires into contact with each other and which is coated with a rigid insulating material to retain the conductor wires electrically insulated from each other except at the contact region.

Abstract: The invention concerns a humidity or moisture sensor, with a relatively thick sensitive monolithic ceramic volume. The sensitive volume is defined by a porous ceramic material with multiple electrodes buried therein in parallel planes which extend substantially entirely across two dimensions of the structure. Moisture entering the porous crystalline matrix is subjected to a high electric field giving rise to a current which is a function of the ambient moisture. By virtue of the inert ceramic surface and the buried precious metal electrodes, the device is sensitive, fast, yet electrically, chemically, thermally and mechanically stable.

Abstract: A keyswitch for a keyboard is disclosed that has a support assembly which holds a saturable magnetic core and drive and sense line wires for the core. A plunger and magnet assembly that is depressible relative to the housing of the switch allows a permanent magnet to be moved away from the core when the plunger is depressed so the core can come out of magnetic saturation, thereby allowing signals from the drive line to be coupled to the sense line. The support assembly is formed of a two-piece construction that utilizes two identical molded plastic parts whereby the core and drive and sense line wires can be easily inserted into and removed from the support assembly.

Abstract: Disclosed is an induction heating apparatus wherein the tank circuit and heater coil are combined in a single unit which is separated from the power supply. A coil forms both the inductance element of a tuned circuit and the primary winding of a current transformer. The inductance element is associated with a secondary winding formed by a metal sheet of material wrapped about the inductance element and can form both the capacitance of the tuned circuit and the secondary winding of the current transformer. A heat transfer unit is connected directly to the secondary winding formed by the single turn of sheet material and is used to provide inductive heating to a work surface to which thermally activated adhesives are to be secured. The induction heating unit is formed as a hand-held portable gun and includes the electronic circuitry in a rear body portion of the gun and the heat transfer unit forms a nosepiece for the gun so that precise local areas can be heated.

Abstract: A one sided or blind fastener assembly including a threaded fastener member inserted through a sleeve member having a tubular body, a head at the outer end thereof and a tapered inner end, and an expansion member including an internally threaded end portion adapted to be expanded as it is drawn up over the sleeve. Longitudinally extending ribs on the tapered end portion of the sleeve matingly engage longitudinally extending slots in the expansion member serving to confine the movement of the expansion member to an axial telescopic movement over the tapered sleeve portion. The upper edges of the expansion member are tapered inwardly toward the slots to enhance the clamping capabilities of the fastener.

Abstract: A thermal switch for automatically opening a circuit when the ambient temperature is increased to a predetermined level. A pair of conductor wires are arranged in side by side fashion with extremities extending in the same direction. A spring portion is included in at least one of the conductor wires to provide stored energy when the spring is biased into electrical contact with each other. A localized contact region is included in the conductor wire in the region below the spring portion but spaced upwardly from the associated extremities to create a lever arm. The extremities, contact region, lever arm and spring being encapsulated with a heat fusible material which biases the conductor wires into contact with each other and which is coated with a rigid insulating material to retain the conductor wires electrically insulated from each other except at the contact region.

Abstract: A gear checking machine for measuring the involute profile and the helical lead of a gear having a support table which is coupled to a base disc that is driven by a friction drive mechanism is disclosed. The friction drive is achieved by means of a small drive wheel which drives the large base disc which has its shaft coupled to the rotatable support table. An encoder having a small drive wheel which is frictionally driven by the large base disc is employed whereby the encoder supplies electrical output signals representative of the degree of rotation of the support table and the gear. Involute and lead checking probes are mounted so they may move in the horizontal and vertical directions, respectively, relative to the gear being checked.