Abstract: For use in combination with an expansible linkage bracelet of the type having rows of overlapping resiliently interconnected upper and lower links, a clasp adapted for adjustable and detachable connection to an end portion of the bracelet. The clasp has a casing with a base wall and upturned side walls defining a channel for receiving the bracelet end portion. A lid having a top wall with downturned side walls is mounted for pivotal movement relative to the casing between open and closed positions respectively exposing and enclosing the receiving channel. Engagement members at one end of the clasp are arranged to protrude between selected laterally adjacent pairs of upper and lower bracelet links, thereby retaining the bracelet end portion within the receiving channel when the lid is in the closed position.

Abstract: An attachment for a power driven installation tool for a threaded fastener and a stress plate includes a barrel assembly connectable at a first end to the driver and terminating in an outer barrel at a second end. The outer barrel terminates in a stress plate holder and the stress plate holder is free to move with respect to the rest of the tool. In a preferred embodiment, a floating barrel is positioned for slidable movement within the distal end of the outer barrel and a stress plate holder is rigidly secured to the floating barrel and external of the outer barrel.

Abstract: A helicopter transmission mounting structure is disclosed in which at least three decoupled inertial isolators (26,38,30,32) are connected to the transmission (12) to support the helicopter fuselage. Each of the inertial isolators (26,28,30,32) is mounted in the nodal plane of the transmission (12) to absorb inplane vibrations generated by a rotor blade and transmitted through a rotor mast (10). The inertial isolators (26,28,30,32) respond individually to applied vibrations which have predetermined frequencies and generate counteracting forces to reduce the amplitude of vibrations transmitted to the fuselage. In an alternative embodiment beam input links (134,136,138,140) are connected from the nodal plane of the transmission to inertial isolators (142,144,146,148). The beam input links (134,136,138,140) are connected to transmit only those forces parallel to the rotor mast (10).

Abstract: A plastic plate is provided for use with a fastener to secure insulation to a metal roof deck. The plate has a planar portion having a centrally disposed tapered hub portion. The central opening and preferably a clear through hole extends in the plate in the area of the hub. The bottom of the plate includes anti-rotational means for engagement with the insulation during driving of the fastener. The anti-rotational means may be associated with the bottom of the planar portion, the hub or both. The fastener may include two separate and spaced apart threaded portions so that as the fastener first engages the metal deck, the unthreaded portion is within the previously tapped hub portion.

Abstract: A mounting for a helicopter pylon having a plurality of resilient vertical support links (24-27) between the pylon (12) and the helicopter fuselage (13). The links have a composite spring rate for a given pylon weight which establishes a resilient support for the fuselage from the pylon at the thrust required to support said fuselage in normal flight and in which oscillatory vertical force transmitted to fuselage is minimal for acceptable static deflections of the pylon.Physical stops (24e, 24n, 24p) are operable to limit deflection between the pylon (12) and the fuselage (13) at predetermined rotor thrust above and below said normal thrust.Links (24-27) are mounted at the ends of a pair of rigid beams (20, 21 and 22, 23) which are secured at the centers thereof to opposite sides of transmission portion of the pylon (12).A vertical rigid mounting pin (24b) extends downward at the end of each beam.

Abstract: A strap for attaching a watch or other jewelry article to the wrist of a wearer, including non-expansible non-metallic strap members interconnected by a metallic coupling device. The coupling device is adapted to accommodate adjustment or variation of the overall length of the strap to suit the requirements of the wearer. At least one of the strap members has a strap adaptor permanently secured thereto, with at least one tab member protruding therefrom. A connector element on the metallic coupling device has an aperture, notch or the like into which the tab member is received before being bendably deformed to overlap and detachably secure the coupling device to the aforesaid strap member.

Abstract: A machine unit which is capable of functioning alternatively as a payoff and as a winder in the handling of coils of metal strip to be fed into a rolling mill (payoff mode) and to be received from the rolling mill (winder mode) comprising an expandible mandrel or block and a tandem piston and cylinder drive for adjusting the diameter of the block in accordance with its selected mode of use.

Abstract: An improved, endless safety saw chain includes a pair of side links, one of the side links being a cutter link and the other of the side links being a noncutting link and having a depth gauge in substantial alignment with a depth gauge on the cutter link. A preceding center drive link may include an upward and rearward sloping surface positioned to extend between the depth gauges of the side links. The sloping surface is preferably dimensioned so as to be in substantial alignment with the depth gauges as the saw chain articulates about the nose of the chain saw bar.

Abstract: A control for a helicopter tail rotor where inboard twist sections on opposite sides of a central hub section are adjacent to pitch horns mounted outboard the margins of the twist sections and extend to a negative delta.sub.3 connection point located at the virtual bending axis of each twist section. The rotor teeters on the tail mast with the span axis of the rotor at an angle of the order of 30.degree. to 45.degree. from the teetering axis.

Abstract: A compact bistable, magnetically operated fuel valve embodies an upper portion comprising a pair of similarly poled and spaced apart permanent magnets defining vertical side walls of an enclosure space which is completed by a pair of pole plates sandwiching the permanent magnets therebetween. The pole plates provide pole faces at their opposite ends and the two sets of pole faces define air gaps. Within the space there is located an armature of plate like form centrally mounted on an upstanding flexure tube. A valve actuating rod is connected at one end to the free end of the flexure tube and projects therethrough downwardly into a valve block. The valve block presents at least one fuel chamber provided with means for supplying pressurized propellant thereto and is provided with oppositely directed fuel outlets to which oppositely directed thrusters are connected.

Abstract: The method of drawing uniformly heavy walled parts in a multiple plunger machine without any intermediate anneals and a machine for carrying out the method. The method comprises a number of press operations which convert a flat blank to a final desired drawn configuration, the relatively uniform wall thickness being maintained throughout the operation by the mouth configuration of each die and by means of supplemental sleeves that assist the punches in extending the drawn shells into the dies with no stretch to the metal or thinning of walls. Work hardening due to stretch or tensile load is minimized allowing more deformation without anneals.

Abstract: High velocity impact landing forces are attenuated in apparatus (10) utilizing an energy absorbing tube (12) of composite fibrous material, that is, a fiber reinforced plastic. The energy absorbing tube (12) is disposed in force transmitting relation between an anvil (14) disposed at one end and structure (16) for applying a force to the opposite end of the tube (12) to provide force attenuating apparatus. The tube (12) is progressively crushed onto the anvil (14) by the force applying structure (16) to dissipate energy. The force attenuating apparatus (10) is used in an energy absorbing seat (20) to provide occupant protection against high impact forces. Other uses of the force attenuating apparatus (10) is in a landing gear mechanism (76) and a vehicle bumper system (89).

Abstract: Solid state control devices are placed in series with each field winding of a step motor having a field for each of two phases. Each control device has a control terminal selectively permitting stepping drive current flow through the series field winding and gate means controlling each terminal. Sequence control means selects the sequence of application of control signals to respective gate means to determine the sequence and direction of drive. A timed current chopper means applies a timed signal to the gate means to determine when the control signal and what part thereof may be applied to the control electrode of the control device to control and adjust the drive effect. In this environment, sensing means is provided to determine when and how much current is flowing in a given field winding and to provide a signal to a comparator which is used in controlling the chopper. Various control circuits are provided for sensing and control in this environment.

Abstract: A machine tool having a spindle assembly associated with an indexing tool storage rack on which a number of distinct tools are stored, and a transport or tool carriage for conveying a selected tool between the storage rack and the spindle assembly; and including a control circuit for sequencing the operation of the various component parts of the machine tool for either manual or automatic operation. The spindle assembly includes a variable speed motor drive for rotating a spindle having a drawbar for releasably securing a tool adaptor with the tool to the end of the spindle and which is associated with a push rod operable to control the release of the tool adaptor during a tool changing operation. A spindle gear shifting assembly is operatively connected to the spindle for shifting of the spindle between direct high speed drive and back gear low speed drive or to a neutral position in which the spindle is disengaged from the variable speed motor drive.

Abstract: A one-piece fastener for attaching a spring member to a frame or the like comprising a length of metal bent to provide (1) a pair of frame penetrating portions disposed generally parallel with respect to one another and having free ends configured to facilitate simultaneous entry thereof into the frame, (2) a pair of relatively short driving portions connected at one of their ends with the opposite ends of the frame penetrating portions and extending therefrom at generally right angles in directions generally toward one another, and (3) a nestable portion connected with the driving portions bent to define a hook for receiving the spring member therein. A stick package is formed of a multiplicity of fasteners. In one embodiment the nestable portions of adjacent sticks are disposed in horizontal abutting relation and the frame penetrating portions of adjacent fasteners are disposed in parallel relation.

Abstract: Generally disclosed is a filtration system including a pair of filters having a pair of diverter valves connected at the input and output thereof for controlling the flow of viscous fluids through one of the other of the filters. More specifically, there is disclosed a diverter valve for controlling viscous fluid flow at the input and output of the filters. The diverter valve is a slide valve which provides a fluid flow path which has no isolated flow areas subject to stagnation. The diverter valve is constructed of a slide plate sandwiched between a manifold block and a backing plate. The slide plate defines a passageway which mates with ports provided in a sealing surface of the manifold block so that a continuous flow path is provided between inlet and outlet of the diverter valve. Sealing pressure is maintained between the slide plate and the manifold block by a plurality of tie bolts urging the slide plate into contact with the manifold block.

Abstract: The invention contemplates a removable-seal configuration for an axial end of an antifriction bearing wherein seal components are fixedly held by the outer bearing ring and position a seal ring in yieldable circumferentially continuous wiping contact with a seal surface on the inner bearing ring. The component seal parts comprise a stiff annular backing ring, and a stiff removable split ring, with a yieldable annular seal ring compressed between the stiff rings and having the wiping contact with the inner ring. The outer ring has a shouldered groove to retain the component seal parts, the groove having a section of continuously curving contour and being characterized by a convergent ramp with which a similarly sloped bevel of the split ring has wedging contact to derive the indicated compression of the yieldable seal ring.

Abstract: A system for opposing helicopter blade flapping applies restraining forces at a low spring rate at low flap angles and at a high spring rate at flap angles greater than a predetermined angle. More particularly, bearings rotatably support the blade yoke on rotor hub trunnions which form a flapping axis. A resilient mechanical coupling between the blade yokes and the hub trunnion applies a restraining force having a characteristic linear with flapping angle. A second restraint mounted to rotate about the flapping axis with the rotor, applies a nonlinear restraining force which preferably rapidly increases beginning at a predetermined flap angle, and over the range short of hard flapping contact between the rotor and the rotor mast.

Abstract: A workbench filtering station (10) includes a generally open interior in which a plurality of filter bags (50) are disposed to partially clean a gas stream. The gas stream is communicated to the bag filters (50) through an air intake (46). The air intake (46) is in the form of perforations in the side walls (44) of the filtering station (10). The station (10) includes HEPA-filters (60) which receive the partially-cleaned air from the bag filters (50). The HEPA-filters (60) clean the air to a clean-room environment. A fan (30) draws a constant volume of air through the filtering station (10) and exhausts the clean air into the room. In operation, a constant volume of air is drawn into the filtering station through the side intake panels. The air is communicated to a first filter station which is in the form of bag filters. The air is then passed through a HEPA-filter stage for further cleaning and exhausted to the room.

Abstract: An adjustable clasp for interconnecting two sections of a bracelet, including in combination a coupling assembly secured to the end of one bracelet section, and a clamp assembly detachably fixable at selected locations along the length of the other bracelet section. The clamp assembly has a bottom wall with opposed side walls extending substantially normal thereto. A resilient pressure plate is supported by the side walls at a location cooperating with the bottom wall to define a space therebetween for receiving the said other bracelet section. A rigid clamping member also is supported by the side walls. The clamping member is adjustable between an open position allowing limited movement of the pressure plate relative to the bottom wall in order to accommodate slidable movement of the said other bracelet section through said space, and a closed position resiliently deflecting the pressure plate to positively grip the said other bracelet section between the pressure plate and the bottom wall.