Abstract: An internal combustion engine 5 includes an intake valve spring 60 including a closely-wound section 62 and a sparsely-wound section 63. The closely-wound section 62 is provided so that elemental wire portions thereof are closely in contact with each other in the direction of the coil axial line L1 while an intake valve closes an intake port. The sparsely-wound section 63 is provided so that elemental wire portions thereof are spaced apart from each other in the direction of the coil axial line L1 while the intake valve closes the intake port. The coil outer diameter D62 of at least a part of the closely-wound section 62 is smaller than the coil outer diameter D63 of at least a part of the sparsely-wound section 63.

Abstract: A cage-type hyperbolic spring structure and a socket are provided. The cage-type hyperbolic spring structure is applied in a jack terminal. The cage-type hyperbolic spring includes multiple copper hyperbolic columnar canted springs and a machined body. The multiple copper hyperbolic columnar canted springs are annularly wound into a closed cylindrical annular structure by laser spot welding or a thin hollow tube, the cylindrical annular spring structure is inserted into the machined body, and then a inclined riveting necked port at an end of a thin-walled tube ensures the cylindrical inclined spring not to fall off during plugging and unplugging of the male terminal and the female terminal, it may also employ an assembling method to install an elastic C-ring to press the end of the thin-walled tube tightly.

Abstract: An impact absorber includes an energy absorbing member that is formed of a composite material and absorbs impact energy by crushing in a predetermined crush direction, an outer tube member surrounding the periphery of the energy absorbing member over the energy absorbing member along the crush direction to prevent foreign objects from entering or impacting the energy absorbing member, and a pressing member in contact with the front end of the energy absorbing member and the front end of the outer tube member to press the energy absorbing member and the outer tube member simultaneously in the crush direction to thereby crush them. The outer tube member formed in a shape in which tubular portions are coupled in the crush direction, and is crushed in the crush direction while the tubular portions are regularly folded when the outer tube member is pressed by the pressing member in the crush direction.

Abstract: A Tuned Mass Damper (TMD) for damping oscillations of a hanging vertical pump structure includes a removable mass symmetrically configured within the pump structure diameter and supported by a mechanism which provides damped mobility relative to the pump structure so as to absorb and dampen pump vibrations and oscillations. The TMD mass is easily removable before tipping of the pump between horizontal and vertical orientations during maintenance. In some embodiments, the TMD mass comprises fluid pumped by the pump to fully or partially fill a housing, the fluid being gravitationally drained therefrom when the pump is not operating. In other embodiments the TMD mass is supplied by removable solid weights. Damped mobility is provided by springs damped by mechanical or fluid friction, or by obstructed movement of fluid within a partially filled housing. In embodiments, the TMD mass is at least 5% of the total mass of the pump structure.

Abstract: A hysteresis assembly, including: first, second, and third plates; at least one fastener connecting the first and third plates; and, at least one resilient element. The resilient element is: disposed between the first and second plates; disposed about the fastener; and arranged to urge the second plate into frictional contact with the third plate. A damper assembly, including: first and second cover plates arranged to receive torque; a flange axially disposed between the cover plates; at least one first resilient element engaged with the cover plates and the flange and arranged to transmit the torque to the flange; at least one fastener connecting the cover plates and passing through the flange; and at least one second resilient element. The resilient element is: disposed between the first cover plate and the flange; disposed about the fastener; and arranged to urge the flange into frictional contact with the second cover plate.

Abstract: A single-end-mount seismic isolator for protecting a structure from the effects of seismic shock or other external applied forces includes a load shaft that is secured at its first end to a mounting surface on which the structure is supported. So secured, the load shaft projects beyond a base of the structure, on which an actuator is supported. A resilient element, such as a friction spring, is operably interposed between the load shaft and the actuator to allow relative motion between the structure and the mounting surface in the event of a seismic shock or other external applied force. The resilient element also absorbs energy of such motion. The single-end-mount design facilitates seismic retrofitting of existing structures and servicing of seismic isolators in the field. In dual-action embodiments, the resilient element includes primary and secondary resilient elements for damping in two directions.

Abstract: A double acting mechanical shock isolator that includes a stack of friction springs contained within a housing. The stack is retained between the end walls of the housing by a pair of opposed slides. A sleeve passes through the stack and the ends of the sleeve are contained within opposing slides. The ends of the sleeve are connected to the slides by lost motion devices so that the sleeve is engaged by one of the containing slides when the sleeve moves toward the opposing slide and releases the slide when the sleeve moves in the opposite direction so that the stack is loaded in compression when the sleeve is moved axially in either direction.

Abstract: A torsion spring having a central coiled portion and a pair of resilient arms projecting from the coiled portion in different directions is incorporated in a workpiece so that the coiled portion is fitted on a support pin on the workpiece and the arms are engaged with first and second engagement portions on the workpiece. A center pin is inserted into the coiled portion of the torsion spring, and the coiled portion is held by attraction of an attracting portion provided around the center pin. A pair of forming pins are moved relative to the center pin in directions perpendicular to the longitudinal axis of the center pin to abut against the respective arms of the torsion spring and deflect them.

Abstract: The invention relates to an arrangement for a gas spring (1). This consists of an outer cylindrical casing (1a) with a sealing end wall (1b, 1c) at either end. Of these, one (1c) has an axial bore for a piston rod (4a) passing through the bore, which piston rod is connected to a piston (4b) moving axially in the interior of the casing. The arrangement also consists of an annular cylindrical body (5) made of an elastic material. The outer cylindrical wall of the body (5) is operatively connected to the casing (1a) in a sealing fashion. The inner cylindrical wall of the body (5) is operatively connected to the piston (4b) in a sealing fashion. A certain gas pressure prevails in a space (9) defined by the cylindrical wall of the casing (1a), the other end wall (1b) and the piston (4b) and the annular surface of the annular cylindrical body (5) facing away from the end wall (1c) executed with a bore.

Abstract: An attachment for a two wheeled bicycle allowing a mentor to provide a graduated correcting and stabilizing force to the bicycle for aiding a novice rider to maintain balance and gain confidence. The attachment comprises two substantially parallel rigid tubular members having an inside diameter being fastened to a bicycle frame and a hairpin shaped handle having a resilient connection to the members. The hairpin includes a U-shaped portion having extended straight parallel limbs. The end of each straight limb is connected to a spring-like bendable element which is inserted partly or fully into the tubular members. The spring-like elements have a sliding interference fit within the interior of the tubular members.

Abstract: Face shock absorber for extracting core-collecting pipes used for the drilling of solid mineral resources, which is incorporated in the drilling unit above the rock-breaking tool. It comprises a housing, the opposite ends of which are connected to a top and a bottom adapter, respectively. The top adapter is threadably connected to the top of the housing, the bottom end of which is provided with face fingers which interdigitate with the face fingers of the bottom adapter, formed in its top end. The bottom adapter is connected via an internal thread in the bottom end to a rock breaking tool inside the housing there are disposed external spring rings and internal spring rings which form a cylindrical spring pack, the top end of which is in contact with the top adapter, while its bottom end is in contact with the top face of a spacing sleeve, which is seated on the top face of a carrying collar forming part of the bottom adapter.

Abstract: The present invention utilizes a wire wool slug packed inside a helical coil of an aircraft engine sensor in order to reduce vibration damage to the coil.

Abstract: There is disclosed a shock sub for incorporation in the lower part of a drill string for damping oscillations of the bit and drill string during drilling. The shock sub incorporates a spring assembly including a multiplicity of substantially annular ring springs that exhibit a spring rate of less than about 25,000 pounds per inch of deflection. This is a continuation of application Ser. No. 849,718, filed Nov. 8, 1977 now abandoned.

Abstract: A feature of this invention is a positively assembled, double acting spring buffer having all spring guides disposed within and extending the full length of the spring assembly.

Abstract: An impact deflection absorber and stabilizer for providing an interface between two items, surfaces, etc. permitting regulated and controlled travel (energy absorption) along its longitudinal axis and constraining motion in all other directions. An energy absorbing spring is positioned within a housing comprised of two cylindrical mating surfaces forming a friction surface therebetween. A collar clamp joins the two cylinders together and adjustably controls the amount of friction between the two surfaces thereby providing control of the energy absorbing capability of the device. The clamp also has the effect of strengthening the device along non-longitudinal axes, such that all axes have a resonant or fundamental frequency higher than that along the longitudinal or primary axis whereby the device will yield longitudinally regardless of what direction the forces are emanating from.

Abstract: Apparatus for dampening the closing of a heavy door of the type mounted along a hinge axis on a heavy movable member such as a digging bucket for a shovel, said dampening apparatus comprises a crank pivotally mounted intermediate its ends on said movable member adjacent said hinge axis, linkage means pivotally mounted adjacent one end thereof on said door and pivotally connected adjacent an opposite end to one end of the crank, a cushioning device having a lower pivotal connection pivotally connected to the crank at the end thereof opposite from the first-mentioned end and an upper pivotal connection pivotally connecting the cushioning device to the movable member, and the cushioning device comprises a telescopic rubber snubber.