Abstract: A one piece fastener which uses spring action to fasten parts together. The fastener has a body which is inserted into a drilled aperture in the parts. An enlarged head on one end of the body is too large to enter the aperture. A spring on the other end of the body is normally too large to enter the aperture but can be retracted to a size to pass through the aperture. A stud has its head connected to the spring and its opposite end in threaded engagement with an internally threaded passage extending through the body of the fastener. Turning of the stud by a special tool applies a torsional force to the spring which retracts it so that the fastener can be applied to or removed from the fastened parts. Alternative embodiments of the invention employ various types of multiple stage springs to enhance the fastening power.

Abstract: A one piece fastener which uses spring action to fasten parts together. The fastener has a body which is inserted into a drilled aperture in the parts. An enlarged head on one end of the body is too large to enter the aperture. A spring on the other end of the body is normally too large to enter the aperture but can be retracted to a size to pass through the aperture. A stud has its head connected to the spring and its opposite end in threaded engagement with an internally threaded passage extending through the body of the fastener. Turning of the stud by a special tool applies a torsional force to the spring which retracts it so that the fastener can be applied to or removed from the fastened parts. Alternative embodiments of the invention employ various types of multiple stage springs to enhance the fastening power.

Abstract: A self-retaining bolt assembly including a bolt having a head, a shank, and a threaded end adapted to be inserted into a hole in a panel or the like for subsequent coupling to a nut on the blind side of a subpanel. The bolt includes a detent engaging one side of the panel in which the bolt is inserted with the head thereof on the opposite side of the panel. The hole for the detent is placed in the location on the bolt that allows maximum strength capability through both the grip area and through the thread area of the bolt. This is accomplished by the use of a locking element of detent that does not require a hole in the shear or threaded area of the bolt. A nut can then be threaded to the end of the bolt projecting through the panels.

Abstract: The binder mechanism for loose-leaf binders or file folders comprises a flat, oblong support plate on which are disposed at a standardized mutual distance at least two binder yokes, each consisting of a fixed yoke rod and pivotable yoke part, which is provided with a crank arm. The pivotable yoke parts are operable jointly because they are interconnected by a coupling rod disposed in the support plate. The support plate is made of plastic and has a cavity which is open at its underside and in which the crank arms and the coupling rod are accommodated. The privotable yoke parts are mounted in mounting bushings integrally molded to the likewise plastic crank arms mounted in hollow cylindrical bearing lugs or bearing holes of the support plate. The coupling rod and/or at least one of the crank arms are associated with a releasable detent or locking device which arrests the movable yoke parts jointly in their pivoted position forming the yoke shape.

Abstract: A bolt is provided with a radial, spring-loaded pawl, and an associated nut is provided with cooperating detents on its inner diameter that cooperate with the pawl so that the nut does not back off the bolt. The nut is also castellated for insertion of a cotter pin through the bolt so that the nut is further restrained from backing off. In the event that the nut backs off, the pawl prevents the bolt from pulling out of a close tolerance hole, such as a rod end fitting.

Abstract: A releasable fastening device for securing workpieces together in a firm and intimate relationship is disclosed. The fastening device is sometimes referred to as a "blind fastener". The fastener comprises a bolt member including a head located on one end of the bolt and extending outwardly therefrom to support an upper workpiece and a shank with an annular recess, the shank being insertable within said through axially aligned apertures located in the workpieces. An expandable device, preferably in the form of a stiff spring is inserted and is confined within the annular recess. When the spring is in its expanded position, it extends beyond the shank along a bottom surface of a lower workpiece thereby along with the head on the bolt member holding the workpieces together in a mating relationship.

Abstract: The present invention provides a self-retracting, captive fastener assembly which allows the application of a controlled preload not requiring separate measurement during or after application. The assembly includes the use of a hold-out spring (31) which is isolated and fully retracts the assembly when the installed assembly is not engaged with a substructure. A housing (32) is provided for the hold-out spring (31) and contains the spring (31) when it is fully compressed. For the controlled preload, disc springs (40) are used. The shoulder (60) of the bolt shank portion (24) is staked so as to form protrusions (61,62,63,64) for captivating these mentioned elements upon the bolt. A removable, retaining element or stop-nut (50) is also provided for securement of the fastener to a first structure 65. The stop-nut (50) is constructed so that it must be seated against substructure (70) in order to achieve the controlled deflection of the disc springs (40) and thereby achieve the desired preload application.

Abstract: The pin incorporates a cylindrical body in which two sliding components are mounted, the two sliding components being intended to engage in lug holes or between the cheeks of a bracelet link or of a fastener. The sliding components have a threaded portion which is intended to be screwed into the lug holes so as to ensure locking of the pin. The cylindrical sliding components may either be held apart by a spring, or may be screwed into the tube.

Abstract: The fastener is in a single piece and adapted to achieve the blind assembly and fixing of sumperimposed elements (A, B) provided with openings (C, D) which have a substantially square-shaped common part in which the fastener is engaged so as to fix together the element (A, B) after rotation of the fastener. For this purpose, it comprises a head (1) so shaped as to pass through the common part and connected to a rectangular-sided stem (3) so as to define two shoulders (4). This stem (3) is enlarged at one end in the form of a foot adapted to cooperate with the shoulders (4) by means of wings (6) of the foot to trap therebetween the elements (A, B).

Abstract: A vent pipe extension and flashing apparatus for extending a vent pipe into a chimney including a generally vertical wall having an interior surface, an exterior surface, and an opening through the wall. The apparatus comprises a threaded sheet metal pipe including helical threads extending along substantially the entire length of the outer surface of the threaded pipe, the threaded pipe having opposite first and second ends, the first end being adapted to extend through the opening in the chimney wall, the second end being adapted to be connected to a vent pipe. The apparatus also comprises restraining means for engaging the interior surface of the wall to prevent the threaded pipe from being pulled back through the opening, the restraining means being supported by the first end of the threaded pipe and being compressible to allow the first end of the threaded pipe to be pushed through the opening in the wall.

Abstract: A quick-release fastener comprises a threaded stud (11) and a complementarily threaded receptacle (1), the stud and receptacle each having one or more longitudinally extending threaded and unthreaded portions (15,8). The or each threaded portion (15,8) of the stud (11) and receptacle (1) respectively has a lesser angular width than the unthreaded portions of the receptacle and stud respectively. The fastener has at least one stop (9) at one edge of the or one of the threaded portions (8,15) on the stud or receptacle, whereby the stud can be inserted into the receptacle with the threaded (8,15) and unthreaded portions of the stud (11) and receptacle (1) respectively aligned and can thereafter be rotated to engage the respective threaded portions. The stop (9) prevents over-rotation of the stud (11) within the receptacle (1) thereby to define a fastened orientation of the stud within the receptacle.

Abstract: In an exploration type drill rig, an improved assembly arrangement for a soil sampling tube and head support therefor including nesting, aperture-aligned tubular wall sections of the sampling tube and head support with a pin extending through aligned apertures and held in position by a spaced stop and movable detent extending radially from the pin on opposite sides of the nesting tubular walls.

Abstract: The captive screw has an enlarged head to prevent complete passage of the screw through a bore in a panel. The shank of the screw has a side opening incorporating a retractable latch radially extending from the shank. This latch has upper and lower sloping cam surfaces at its forward end. The lower surface is oriented such that urging of the screw inwardly through the bore in the panel retracts the latch. The latch is spring-biased radially outwardly so that after the latch clears the bore, the screw is held captive. The upper cam surface of the latch intercepts the lower cam surface in a line which is tilted at an angle corresponding to the helix angle of the threads in a nut receiving the screw in an adjacent panel. The screw can thus be threaded into this nut to close the panel and the latch will function as a thread lock.

Abstract: A spacer device for use in construction of conventional walls to permit increased wall thicknesses and use of additional insulating materials. The spacer comprises a hollow cylinder having spring biased pins extending chordally from the sides of the cylinder. The pins may be compressed against the springs and into the cylinder to permit insertion of the spacer device through apertures in a wall panel. After insertion, the springs force the pins outward to act as a positive stop against axial movement of the panel along the cylinder.

Abstract: A safety bolt having a headed end, a shank, and a second end with means near the second end to hold the bolt in a hole in a workpiece. An axial passage opening into the second end intersects a laterally-extending passage spaced therefrom, and a dog fits in the laterally-extending passage wherein it is laterally reciprocable so as to be extendible beyond the maximum diameter of the shank or to be entirely retracted within it. A cam member having a pair of oppositely facing cam surfaces is axially slidable in the axial passage. The dog has a pair of followers one on each side bearing against oppositely directed cam surfaces whereby the lateral position of the cam is uniquely a function of the axial position of the cam member. Bias means is provided to bias the cam member to a position corresponding to maximum extension of the dog.

Abstract: A safety bolt having a headed end, a shank, and a second end with means near the second end to hold the bolt in a hole in a workpiece. An axial passage opening into the second end intersects a laterally-extending passage spaced therefrom, and a dog fits in the laterally-extending passage wherein it is laterally reciprocable so as to be extendible beyond the maximum diameter of the shank or to be entirely retracted within it. A cam member having a pair of oppositely facing cam surfaces is axially slidable in the axial passage. A bias spring is provided to bias the cam member to a position corresponding to maximum extension of the dog. A plug is detachably attachable to the safety bolt to hold the cam member in a position respective to retraction of the dog. A projection can be provided on a nut for use with this bolt to prevent reversal of the nut, and a plurality of bias springs each with a different rate can be used.