Abstract: Rotary ratchet mechanism includes a ratchet wheel rotating about a first axis. A dog at one end of a lever engages a tooth of a wheel to rotate it in one direction. The lever is pivoted to a member at a point spaced from its end, the member being movable from first to second positions along a second axis spaced from the first axis and normal to a plane including the same to move the dog in the opposite direction from a first position engaging one tooth to a second position engaging another tooth. The pivot is spaced from the second axis on its side remote from the first axis and in the first position of the member is spaced from the other side of the plane. An anti-reversing dog is provided at one end of a second layer pivoted to a support at a second point spaced from its end, the second pivot being spaced from the other side of the plane and from the second axis on its side toward the first axis.

Abstract: A security system which includes closed loop fire detection circuitry, having a continuous monitor of the pyrogenic sensors, closed loop intrusion detection circuitry, a multiple tone audible alarm generator, a coded keyboard digital electronic lock circuit, and a fail-safe alternating current, direct current power supply which includes a battery, battery charging circuit, and a system testing facility. The audible alarm circuitry includes a modulated tone frequency generator and a modulating circuit operable between a plurality of states in response to different alarm conditions. The fire and intrusion circuits include filter circuits to prevent spurious operation, and feedback latching circuits for generating continuous alarm signals in response to a breach of the system. The entire circuit is fabricated with solid state electronic components including micro-electronic circuitry.

Abstract: An internal pinion revolution counter includes a bearing member rotatably supporting an input shaft. At least first and second number wheels are provided each having a radially outwardly extending web portion joined to an annular flange portion, the first and second number wheel flange portions respectively extending toward each other. Each web portion has an annular bearing surface which defines a central opening. The flange portion of the first number wheel has an internal gear segment and cooperating internal locking cam formed thereon, and the flange portion of the second number wheel has an internal full tooth gear formed thereon. The first number wheel is connected to the input shaft for rotation therewith. A pinion carrier is arranged within the center opening in the web portion of the second number wheel, surrounds the input shaft, and is secured against rotation with respect to the input shaft.

Abstract: An internal pinion revolution counter includes a rotatable input shaft having first and second axial sections, and a bearing sleeve member rotatably supporting the first shaft section. A gear member is rotatably mounted on the sleeve member and has first and second axial sections, the first section having a first full tooth spur gear formed thereon. A first number wheel is secured to the second shaft section for rotation therewith, and an internal pinion transfer mechanism couples the first number wheel to the first spur gear. A second number wheel has a web portion joined to a hub portion mounted on the first spur gear for rotation therewith, and the second section of the gear member has a spur gear segment formed thereon as an extension of the first spur gear. A locking ring has a hub portion mounted on the second section of the gear member, and having an axial slot formed therein with the gear segment extending therethrough, the hub portion of the locking ring having an annular outer locking cam surface.

Abstract: A flush lighted flat keyboard assembly including a printed circuit board having conductors on one side. Resilient dome switch elements are supported on the one side of the board in spaced-apart relationship in peripheral contact with certain conductors to make center contact with other conductors upon the application of force thereon. Another printed circuit board has one side in facing relationship with the first board and has openings therein respectively in alignment with the switch elements. Light sources are mounted on the other side of the second board which has conductors thereon connected to energize the light sources. A flexible switch-actuating member has one side in facing relationship with the other side of the second board and has switch-actuating projections extending therefrom through the second board openings toward the switch elements. The one side of the actuating member also has isolator projections thereon intermediate the switch-actuating projections, which extend toward the second board.

Abstract: A flat keyboard assembly including a printed circuit board having conductors on one side thereof. Resilient dome switch elements are supported on the one side of the board in spaced-apart relationship in peripheral contact with certain conductors and adapted to make center contact with other conductors upon the application of force thereon. A sheet of relatively thin insulating material covers the one side of the board, the dome elements and the conductors thereon. A switch-actuating member formed of relatively thin, flexible insulating material is in facing relationship with the insulator sheet and has switch-actuating protrusions thereon respectively in alignment with the switch elements and extending toward and contacting the insulator sheet. The actuating member also has isolator protrusions thereon intermediate the switch-actuating protrusions and respectively in alignment with the spaces between the dome elements and extending toward the insulator sheet.

Abstract: A low profile, lighted, push button switch including a printed wiring board having conductors terminating in switch contacts thereon. A first insulative member abuts the wiring board covering the conductors thereon and has an opening therein which exposes the switch contacts. A resilient switch element is positioned in the opening in the first insulative member cooperating with the switch contacts and actuatable between open and closed positions in response to force applied thereto. A thin sheet of insulating material covers the first insulative member extending over the opening and the switch element therein. A second insulative member abuts the insulating sheet and has an opening therein aligned with the opening in the first insulative member. A switch actuating member is positioned in the opening in the second insulative member. Another printed wiring board abuts the second insulative member and has at least one opening therein communicating with the opening in the second insulative member.

Abstract: A printed wiring board for a keyboard switch assembly for electronic apparatus, such as electronic calculators, comprising a self-supporting insulative board having a plurality of elongated connectors on one surface thereof, at least some of the conductors having terminal portions for cooperating with switch elements. A layer of insulating material covers the one surface of the board and the conductors excluding the terminal portions. Each of the terminal portions has a coating of conductive ink thereon and a jumper element also formed of conductive ink is coated on the insulating layer crossing at least one of the conductors embedded therein and joining at least two of the terminal portion coatings. The conductive ink is preferably a noble-metal filled resin compound, such as silver epoxy, screen printed onto the insulating layer and terminal portions.

Abstract: A push-button type switch device for use in generating binary coded signals. An insulative board is provided having flat opposite surfaces. An overcenter, snap-acting diaphragm switch element is provided movable between a first inactive position and a second overcenter operative position in response to application of a predetermined operating force thereon, as by depression of a push button. The diaphragm element has a centrally disposed common contact area and a plurality of radially spaced leg members extending outwardly therefrom. The leg members have outer ends which respectively engage first terminal pads on one surface of the board thereby normally supporting the diaphragm element thereon in its first position. A common terminal is provided on the one side of the board and has an external conductor connected thereto, the common terminal being in registry with the common contact area of the diaphragm element and spaced therefrom in the first position.

Abstract: A multiratio drive which comprises a drive plate mounted for rotation upon an axis and means for drivingly coupling the drive plate to a source of motive power. A plurality of driven elements are mounted to the drive plate for sliding movement therewith in a direction radially of the axis. Cam means operatively engage the driven elements, the cam means also being mounted for rotation about the axis, the cam means positioning the driven elements at selected ones of a plurality of radially spaced-apart positions in response to relative rotational movement between the cam means and the driven elements. Detent means restrain the driven elements and cam means from relative rotation and shift means are provided for forcing selected relative rotational movement between the driven elements and the cam means to thereby alter the relative rotational positions thereof and correspondingly to alter the radial position of the driven elements and the effective diameter of the drive device.

Abstract: A keyboard switch assembly including a printed circuit board having four switch terminals on one side of the board, three of the terminals being arranged in a triangle and the fourth disposed within the triangle. Conductors on the one side of the board are respectively joined to the interior terminal and at least one of the three terminals. A conductive, generally triangular, snap-acting dome switch member is provided having arcuate apices, projections being respectively formed from the apices and respectively engaging the three terminals thereby spacing the periphery of the switch element from the one surface of the printed circuit board and the conductors thereon, at least the conductor connected to the interior terminal extending under the dome.

Abstract: A keyboard switch assembly including a printed circuit board having four switch terminals on one side of the board, three of the terminals being arranged in a triangle and the fourth disposed within the triangle. Conductors on the one side of the board are respectively joined to the interior terminal and at least one of the three terminals. A conductive, generally triangular, snap-acting dome switch member is provided having arcuate apices, projections being respectively formed from the apices and respectively engaging the three terminals thereby spacing the periphery of the switch element from the one surface of the printed circuit board and the conductors thereon, at least the conductor connected to the interior terminal extending under the dome.