Abstract: A stabilizing device containing two bonded elastomeric materials with restitution coefficients that vary inversely with temperature changes. The resultant restitution coefficient of the printer hammer back-stopper remains relatively constant regardless of temperature variations in the back stopper caused by heat generated by the operation of a hammer solenoid.

Abstract: A joint device in extension drill equipment for percussive drilling is so constructed that, besides transmitting compressive pulses in the drill string in the direction towards the drill bit, it also by reflection transforms tensile pulses in the drill string into compressive pulses. Preferably, the joint device includes members that are axially movable relative to each other and provided with interacting surfaces, and an element connecting the members. Compressive pulses cause these surfaces to abut each other under pressure, while tensile pulses cause the surfaces to become separated. Also preferably, the joint device includes a structure for absorbing kinetic energy generated in the device by torsion pulses in the drill string.

Abstract: A spray gun carriage assembly is disclosed which provides rapid and accurate reciprocating vertical movement of a spray gun mounted on the assembly, with the stroke of the gun movement being readily adjustable. The spray gun carriage is also movable in two additional axes, i.e., in a horizontal plane. A horizontally extending boom is reciprocated vertically to move the spray gun up and down relative to a workpiece, such as a workpiece being conveyed past the carriage assembly. A first shock absorber mechanism dampens the moment of inertia of the boom, and a second shock absorber mechanism dampens the linear inertia associated with vertical movements of the boom, thus providing for quick and accurate spray gun movements and faster and more efficient spraying. A mechanism is further provided for pivoting spray guns mounted adjacent the end of the boom to yield still further adjustment of spray direction. A quick change flight bar facilitates rapid changeover of the spray guns used with the assembly.

Abstract: A tool assembly (4) for working a material (R) such as breaking rock. Assembly (4) includes a tool mounting (17) having a fixed section (18), and a movable section (19) for movement relative to the fixed section (18) in a working direction (D.sub.W) and an opposite return direction (D.sub.R). A tool (34) is mounted on the movable section (19) for movement relative thereto in the working direction (D.sub.W) and return direction (D.sub.R). Limit means (49,50) on tool (34) limits relative movement between tool (34) and movable section (19) to between a tool operative position and a tool operated position. During a working stroke, tool (34) is engaged with material (R) and moved in working direction (D.sub.W) from the operative position to the operated position and thereafter in unison with the movable section (19) under action of a working force applied to tool (34) thereby to work material (R).

Abstract: A vibration damper comprises a housing defining a cavity; a damping mass accommodated for oscillation in the cavity between wall surfaces; and spring elements situated on two opposite sides of the damping mass. Each spring element is in engagement with the damping mass and a respective one of the wall surfaces for positioning the damping mass in the cavity. Each spring element has a shape selected to confer to the spring element a dynamic deformation behavior characterizing spherical bodies. Further, the spring elements, as viewed together, are arranged at least approximately symmetrically with respect to a central axis of the damping mass oriented parallel to the path of oscillation. The vibration damper also includes an arrangement for guiding the damping mass linearly along the path of oscillation.

Abstract: An energy absorber strut includes a pair of elongated drive nuts threaded internally to mate with a drive screw having high lead threads on opposite ends so that outward movement of the nuts on the screw rotates the screw in one direction and inward movement rotates the screw in the opposite direction. A mandrel mounted to rotate with the screw is restrained from rotation by a capstan spring which surrounds and grips it. Prestressed torsion springs connected to the ends of the capstan spring permit it to unwind slightly and drag with respect to the mandrel when the torsion springs are subjected to a predetermined torque.

Abstract: A pickup cartridge comprises a stylus arm having a stylus disposed at one end, and having the other end thereof flexibly supported in the cartridge. A flylead connects an electrode arranged on the stylus to a terminal mounted on the cartridge. In accordance with the instant invention, the stylus flylead is covered with a damping compound to improve the reliability of high speed scanning of the disc.

Abstract: A drilling machine includes a coupling means (19) for removably coupling the drilling machine (1) to the bucket of an excavator with the aid of gripping arms (20, 21). Between the drilling machine and coupling means there is a rubber member (9) taking up misalignment stresses and a gas spring (11, 12) taking up shock and compression stresses arising in conjunction with drilling.

Abstract: A force-transmitting a drive caps is interposable between a pile driver hammer and a pile to be driven. This cap is formed with an upwardly open cylinder which is of smaller area than the striking face of the hammer. A piston is vertically reciprocal in this cylinder and has an upper surface which is engageable with the striking face of the hammer. The chamber below the piston in the drive cap contains a body of liquid and a body of gas. The gas is pressurized so as to urge the piston into a raised position extending upwardly from the upper face of the drive cap. The piston and hammer are dimensioned so that the hammer first strikes the piston, driving it downwardly in the cylinder, and thereafter strikes the upper surface of the drive cap. The gas body may be held in a separate container within the chamber in te drive cap and the pressure of the gas body is established by the amount of liquid in this chamber.

Abstract: In a cylinder formed in a casing a hammer piston is mounted for reciprocating motion and is subjected to periodic pressure pulses from a pressure fluid. To prevent a reaction emanating from each pressure pulse from also acting as a shock on the casing, a balance or compensation mass body is provided in the casing which mass body is subjected to the pressure pulses in the direction opposite to that for the hammer piston and is displaceable parallel to the latter against the action of a spring supported in the casing. Together with the spring, the mass body forms an oscillator, the characteristic frequency of which is advantageously to be selected to be at most half, but preferably one third, of the frequency of the pressure pulses. In this way, the reaction shocks are smoothed out to a recoil force which fluctuates narrowly about a mean value and which can be kept lower than the weight of the casing, so that the casing is not subjected to any recoil accelerations.

Abstract: In a pile driver the sharp force loading on a pile at the moment of impact by a ram is absorbed by a pile driver cushion. The cushion includes a pad formed from a flexible strip of compressed knitted mesh wound in a flat spiral and further constructed to maintain its integrity during use and handling.

Abstract: A new breed of die cylinders operating at 1000-5000 psig. working fluid pressures and adaptable for use individually or by manifolding with punch presses to cushion dies can be operated with maximum rated pressure force against a force which a ram develops in one direction and in the opposite direction with partial pressure force which the die cylinders exert when force balanced. The following is accomplished by loading a piston underside by the same working fluid pressure when the piston bottoms inside a cylinder housing at the end of the ram induced stroke enabling an instant high pressure surge of fluid, be it Nitrogen gas or other working fluid, to enter the piston underside provided with a piston rod and exert a resistance force proportional to the net free area exposed thereto thereby providing force balanced cylinder operation.

Abstract: A shock absorbing tool is provided for connection to a drill column. The drill column includes a drill bit and is positioned in a bore formed in the earth. The shock absorbing tool is an integral, resilient cylindrical member having a number of open sections formed in the cylindrical member. Pairs of open sections are interconnected by slots. Pairs of open sections are longitudinally spaced along the periphery of the cylindrical member. The longitudinal distance between pairs of open sections and the circumferential distance between open sections of each pair of open sections vary. Upon application of dynamic axial and torsional loads to the drill column, the shock absorbing tool absorbs these loads through deflection of the resilient tool such that the slots close and the stress produced by the dynamic loading is carried about the periphery of the open sections.

Abstract: An impact transfer device for pile drivers is made as a one-piece steel unit defining a solid percussion part of a substantially cylindrical configuration with a convex impact surface capable of withstanding steel-on-steel impacts, an intermediate tubular part of substantially frusto-conical configuration integrally connected to the percussion part and a base ring integrally connected to the larger end of the intermediate tubular part having an annular support surface facing away from the impact surface.

Abstract: A brake mechanism for decelerating and positively stopping the support apparatus of a rotating scintillation detector subsequent to completion of a full 360.degree. of rotation as needed for a tomographic study. There is provided a laterally deflectable striker member positioned between two shock absorbers. The support structure of the scintillation detector is either manually rotated or is motor driven by a gear which is provided with a laterally extending striker pin configured and arranged to rotate with said gear and deflect the striker member in a lateral direction as the gear is completing its rotation in either the clockwise or counterclockwise direction. Once the striker pin engages the striker, the striker is deflected either to the right or to the left depending on whether the gear is rotating in a clockwise or counterclockwise direction. In either direction, the striker contacts one of the shock absorbers which serves to decelerate the rotating mass and safely slow it down.

Abstract: A vibrationless pneumatic impact tool comprises: a housing; a cylinder axially displaceable in the housing; a hammer piston reciprocably driven by pressure air in the cylinder; a recoil cushioning air volume disposed between the housing and the cylinder; a first valve arrangement located in a fixed disposition relative to the housing; and a second valve arrangement located in a fixed disposition relative to the cylinder and arranged to cooperate with the first valve. The first valve comprises at least one air inlet opening communicating with a pressure air source and at least one air venting port communicating with the atmosphere.

Abstract: A vibration prevention handle for a vibration device which can effectively prevent vibration and shock generated from a vibration device. The vibration prevention handle according to the present invention comprises a small-diameter close-coiled and larger diameter open-coiled helical spring, in addition to the conventional handle used with a vibration device. The one end of the helical spring is fixedly fitted to the handle, and the other end thereof is loosely fitted to the handle through a resin-made sleeve.

Abstract: A rotary knife holder which is used in a transverse cutter for running paper webs or the like has a tubular carrier with an axial bore for a dynamic damping system serving to damp the natural frequency oscillations of the carrier. The damping system has a cylindrical mass whose end portions are surrounded by elastic annuli installed in a sleeve which is fixedly installed in the axial bore of the carrier. The natural frequency of the damping system is attuned to the natural frequency of the carrier. If the carrier is journalled at both ends, the damping system is installed midway between the ends of the carrier.

Abstract: A pilot assembly as for locating a workpiece in successive forming stages of a machine, such as a punch press, where the workpiece is progressively moved through the forming stages of the machine. The pilot assembly includes a pilot pin mounted to a movable die member of the machine for guiding entry into a previously formed hole in a workpiece or in a companion die member as the die members are moved toward each other, the pin being axially retractable in its mounting in the event it strikes an obstruction.

Abstract: In a pile driver the sharp force loading on a pile at the moment of impact by a ram is absorbed by a pile driver cushion. The cushion includes a pad formed from a flexible strip of compressed knitted wire mesh wound in a flat spiral and further constructed to maintain its integrity during use and handling.

Abstract: In accordance with an illustrative embodiment of the present invention, a shock limiting apparatus for mounting an instrumentality in a drill collar comprises piston and cylinder means subject to hydrostatic well fluid pressure for preventing longitudinal movement of the instrumentality within the drill collar unless a predetermined level of deceleration is exceeded, and a combination of hydraulic damping and Coulomb friction means for dissipating kinetic energy of the instrumentality in a substantially uniform manner when applied deceleration exceeds said predetermined level.

Abstract: A brake to decelerate the driving movement of an actuating rod along an axis. The actuating rod is driven relative to a frame by an actuating mechanism. The actuating rod has an external tapered surface whose lateral dimension decreases in the direction in which it is driven. The brake includes a case attachable to the frame which contains within it a peripheral cylindrical brake band and a wedge member. The wedge member has an outer wall, and a tapered inside wall with substantially the same taper angle as the actuating rod. The wedge member and the brake member are disposed inside a passage in the case, with the brake band disposed between the case wall and the wedge member. There is a spacing between the wall of the passage and the outer wall of the brake band. The tapered inside wall is axially aligned with at least a portion of the inside wall of the brake band.

Abstract: A shock absorber has a body with a bore and a secondary chamber housing a preloaded floating piston. An apertured piston and rod assembly with a float valve is retracted in the bore when the piston rod extending from the body is engaged by a moving body to be decelerated and smoothly stopped. A variable orifice head in the bore bleeds liquid through a series of passages to a return chamber which communicates with a hollow metering pin. This pin directs liquid through the piston and through outlets into a secondary chamber whose floating piston retracts against a spring as the chamber fills with liquid. This maintains a preload pressure upon the liquid in the bore and pressure chamber. The metering pin is tapered and is loosely received by the piston. When a load is axially applied to the piston rod retracting the pressure piston into the preloaded liquid within the body the liquid initially flows between the piston and metering pin.

Abstract: A raise bit is disclosed for enlarging a pilot hole into a larger diameter hole by disintegrating the earth formations surrounding the pilot hole. The raise bit includes a removable drive stem for enabling the raise bit to be transported through small drifts. The drive stem is attached to a thrust bearing plate which, in turn, is interconnected to a main bit body. The bit body extends around the drive stem and includes a plurality of rolling cutters for contacting and disintegrating the earth formations surrounding the pilot hole. The interconnection between the thrust bearing plate and the bit body is accomplished by means of an annular shock absorbing member made of polyurethane. The elastomeric shock absorbing member has a substantially toroidal configuration and is designed and dimensioned to transfer all of the thrust and torsional loads passing from the drive stem and thrust bearing plate to the bit body, while absorbing a large portion of the impact type loads acting on the drill.

Abstract: In the illustrated embodiments, an elastomer body has a relatively thin metal layer overlying the elastomer surface to be loaded so as to prevent adhesion at the elastomer surface in spite of a long period of dwell in contact with a relatively more rigid cooperating part such as a hard rubber stop. In a basic form, a thin metal sleeve may encircle a cylindrical elastomer body. The outer surface of the sleeve may be grooved for extra adhesion resistance. In a further development, the sleeve is formed as a helical wire spring which may be confined between two flanges integral with the elastomer body.

Abstract: A telescopic shock absorber for incorporation in a drill string connected to a rotary bit for drilling a bore hole in earth formations, the shock absorber including a single spring assembly which is compressed downwardly when sufficient downwardly directed drilling weight is transmitted from the drill string through the shock absorber to the drill bit, and which is compressed upwardly when the internal drilling fluid pressure in the shock absorber fully overcomes the downwardly directed drilling weight, assuring that the spring assembly is in its compressed condition when the shock absorber is telescoped or extended, enabling it to absorb shocks and vibrations incident to the drilling operation and under both conditions.

Abstract: Disclosed is a motorized chain saw, comprising: a handle-housing member including at least one handle for carrying the saw; at least one crankcase member; and at least one means including a vibration-damping elastic member for providing a shock absorbing connection between the housing member and the crankcase member. The elastic member is laterally expandable and includes at least one axial expansion opening for accepting a selectively insertable means for expanding the rubber elastic member.

Abstract: This invention is directed to an arrangement for compensating and absorbing vibratory oscillations of a driven spring-mass system by means of an auxiliary spring mass system. The drive for a main spring-mass system is designed such that it is guided along the same axis as the main system and oscillates out of phase with the main system.

Abstract: The vibration forces between a frame and a continuously oscillating mass are absorbed by making the oscillating mass system and its drive means equal and by fitting each such system and means to the frame with identical resilient elements such that oscillation movements of system and means occur out of phase one with the other to absorb the exciting vibration forces.

Abstract: A system for the transmission of data along a borehole during drilling operations which includes an acoustic transmitter receiver and mechanical filters. Data is acoustically propagated from the transmitter to the receiver along a portion of the drill string which is isolated from noise generating elements of the drilling system by means of the mechanical filters.

Abstract: A direction reversal device including a housing and an abutment rod passing through, and movable relative to, the housing, one of the housing and the rod being stationary and the other being arranged to be impacted by a moving unit whose direction of travel is to be reversed, the device also including a resilient connection disposed between the rod and the housing and arranged to have a potential energy storage capacity corresponding to the kinetic energy possessed by the moving unit, and control elements for adjusting the storage capacity and the location of the point of direction reversal of the device.

Abstract: A cylindrical viscous damper drive assembly for driving the matrix of a rotary regenerator heat exchange apparatus, the drive assembly including an annular ring-like driven sprocket loosely encircling the annular hub at one end of a drive shaft coupled to the matrix, the sprocket being drivingly coupled to the hub by a pair of axially spaced apart split ring torsion springs, each torsion spring being pinned at one end to an end of the hub and having a radially outward extending lip at its other end that projects into a socket in the sprocket to effect the driving connection between the sprocket and hub, a pair of O-rings being positioned in axially spaced apart relation to each other to effect a sealing engagement between the outer periphery of the hub and the inner periphery of the socket whereby to define therewith a sealed annular chamber which is filled with a viscous fluid that will provide, when relative rotational movement occurs between the sprocket and hub, a dampening force to reduce torque oscillat

Abstract: An automatic reset plow assembly includes a plow frame drawn by an agricultural vehicle. A plow standard is pivotally connected to the underside of the frame to enable the plow share to pivot backwardly and upwardly upon engaging an obstruction in the soil. The plow standard is resiliently biased downwardly by a toggle link assembly having one link pivotally connected to the plow standard and a second link pivoted to the frame. The other ends of the two links are pivotally connected together and to a slide element to form the elbow of the toggle link. The slide element is slideably received along a guide member which is also pivotally mounted to the frame. A compression spring surrounds the guide and resiliently biases the slide element and toggle links to maintain the plow standard in a normally downwardly pivoted plowing position. Upon encountering an obstruction, the plow pivots rearwardly and collapses the toggle link assembly.

Abstract: A vibration-isolation system uniquely adapted for use in connection with chain saws where vibration-isolation units resiliently interconnect a vibration-generating engine and cutter chain assembly with an inertia-providing handle assembly. The improvement of the invention resides in a bifurcated, resilient diaphragm means constituting at least one such vibration-isolating unit. The improved bifurcated, resilient diaphragm means includes a resilient, generally annular base and first and second axially displaced, first and second resilient generally toroidal segments located on opposite sides of a generally annular, vibration and deflection-accommodating recess means. The bifurcated diaphragm means may also be considered as including a resilient, generally annular base, with first and second resilient, generally annular rim means being supported by first and second resilient cantilever means located on opposite axial sides of the generally annular, vibration and deflection-accommodating recess means.

Abstract: A pneumatic hammer is provided with a handle which is isolated from the body of the tool so that vibrations of a reciprocating hammer are dampened. This is accomplished by a shock absorbing insert located between the handle and reciprocating hammer. The insert includes a rubber cushion member bonded to two steel coupling members, one of which is bolted to the handle and the other which is bolted to the body of the tool. An air passageway extends through the handle and cushion member to reciprocate the hammer. To protect the rubber from deterioration from the oil transported with the pressurized air, a neoprene liner is provided which extends through all of the members and which also as a flange at the remote face of each of the coupling members to provide sealing gaskets thereat.

Abstract: A shock absorber for dampening longitudinal and torsional vibrations in a drill is disposed intermediate a hollow drive shaft member and a hollow driven shaft member of a drill string. Resilient means are sandwiched between a drive plate attached to the drive shaft member and a driven plate secured to the driven shaft member. Additional resilient means are sandwiched between the driven plate and a pressure plate which surrounds the driven shaft member at a position beneath the driven plate. Pins project from the driven plate through the resilient means into vertically spaced openings formed in the drive plate and the pressure plate. Fastening means extend between the drive plate and the pressure plate to precompress the resilient means, and a shielding sleeve is connected to the drive shaft member for sliding movement within the driven shaft member.

Abstract: In accordance with illustrative embodiments of the present invention disclosed herein, a shock absorber adapted to be incorporated in a drill string includes axially splined housing and mandrel members that enclose a resilient structure which absorbs longitudinal vibrations and shock loads and otherwise attenuates exciting forces generated by the drill bit. The resilient structure comprises inner and outer cylindrical torsion tube springs providing a low spring rate.

Abstract: An improved impact-type tool driven by pneumatic or similar power means is provided with a hand grip assembly which is substantially insulated from impact and shaking movements of the drive portion of the tool when the latter is in operation. Both the hand grip assembly and a supplementary weighted ring are disposed coaxially around the tool drive housing and are individually mounted for axial movement with respect thereto. The hand grip assembly is divided into upper and lower chambers by means of an intermediate annular guide member. A first spring disposed in the upper chamber interconnects the hand grip assembly with a flange on the upper portion of the tool drive housing, while a second spring disposed in the lower housing interconnects the hand grip assembly with the weighted ring. The characteristic frequency of the subsystem including the second spring and the weighted ring is chosen to be equal to the normal impact frequency of the tool when the latter is in operation.