Showing papers on "Torsion spring published in 1991"

Torsion exercising device

Abstract: A torsion exercising device which includes a support frame for supporting the exerciser and one end of a pivot arm assembly in pivotally adjustable relationship with a power frame mounted on the opposite end of the pivot arm assembly. The power frame includes a mount bar for rigidly securing the power frame to the pivot arm assembly, a torque tube rotatably and adjustably mounted in the power frame parallel to the mount bar and a torsion bar disposed in sliding relationship inside the torque tube, wherein the exerciser may adjust the rotational position and linear extension of the torsion bar inside the torque tube to create a desired position and resistance for pulling and pushing exercises.

Motor-operated valve

Abstract: The invention contemplates a rotary valve which uses a brushless DC-motor to directly drive the flow control member of the valve. The motor is of toroidal-torque variety, with a wound stator that is fixed to the valve body, and a rotor which is fixed to the valve member. In a first embodiment, one polarity of transient stator excitation drives the rotor in one direction, from one to the other magnetically latched end of a limited angular excursion, and the opposite polarity of transient stator excitation drives the rotor in the opposite direction, to reverse the magnetically latched condition of the rotor and, therefore, of the valve member. In a second embodiment, a torsion spring is connected to apply torque in opposition to rotor displacement from one of the limits of its angular excursion, and the extent to which the valve member is operated is a function of the instantaneous magnitude of stator excitation.

Flexible coupling for progressive cavity downhole drilling motor

Abstract: A composite flexible torsion bar coupling is used to connect the orbiting rotor of a Moineau-type motor to the concentrically rotating output drive shaft The two-piece torsion bar coupling is hollow, to allow fluid passage through the rotor This permits large quantities of fluid flow through the bit without passing all the fluid through the motor The torsion bar is connected to the rotor at an inside surface adjacent to a power-producing surface of the rotor This configuration provides the shortest possible coupling distance, thereby considerably reducing the overall length of the motor without decreasing its power output

Torsion beam accelerometer

Abstract: A semiconductor accelerometer having a sensor element supported by a pedestal coupled to a substrate. Coupling between the pedestal and the sensor element includes opposing torsion beams along the axis of flexure coupled through a spring to the pedestal. The spring includes a pair of beams extending in a direction perpendicular to the torsion beams so that thermal expansion applies a tensile force to the torsion beams.

Torsional oscillation damper in vehicle drive-line - has input and output part, with two torsional spring arrangements and stops

Abstract: The torsional oscillation damper is fitted in the drive line of a vehicle with an IC engine. It has an input part, output part and a torsional spring arrangement (F). Parallel to this first torsional spring arrangement (F) is a second torsional spring arrangement (f) which has a sprung characteristic line with negative course at least near the partial torsion angle. The second torsional spring arrangement (f) has a range of action restricted by stops (7, 8, 9). USE/ADVANTAGE - A very flat sprung characteristic line is produced which uncouples the IC engine and drive mechanism to prevent the transmission of vibrations.

Counterbalanced sectional door - has weight counterbalanced by torsion spring and safety catch to hold door if spring breaks

Abstract: The sectional door consists of panels hinged to one another along their upper and lower edges. The hinge pins carry rollers (9), each of which runs in a vertical guide. This vertical guide (11) is connected by a curved guide rail (10) to a horizontal guide rail (13). The top section (6) of the door is connected by a link (28) to a carriage (21) which runs on an upper guide rail (19). This carriage is driven along the upper guide rail by an electric motor which drives a chain wheel (26) which engages a stationary chain (18). The weight of the door is partly balanced by torsion springs attached to the shaft which carries the chain wheels. In the event of a torsion spring braking a pawl (40) engages the chain and prevents the door from falling.

Sandwiched, micro-mechanical rotary acceleration sensor - has rotary pendulum mounted in several edge bearings on axis between clamps

Abstract: The sensor has a rotary pendulum structured in the silicon middle plate which consists of a rotary plate (1) with two wings (2, 3) between two torsion spring strips (4). It is mounted in several edge bearings in the axis from clamp to clamp. Under each torsion spring strip is an edge bearing symmetrical on either side to the rotary plate. The edge bearings are formed by ribs (6) on the baseplate and the torsion spring strip, whose cross-sections are almost of triangular shape. Between the electrodes of the rotary plate wings and their counterelectrodes voltage is permanently applied. The cross sections of the torsion spring strips is almost rhomboidal. USE/ADVANTAGE - For capacitive rotary acceleration sensors, esp. for vehicle or domestic appliances. Simple design, differential capacitor assembly, mechanical damping.

Lateral compound torsion suspension

Abstract: A suspension system for an automobile includes a compound torsion bar arrangement. The compound arrangement has a first bar which acts as a sway bar and a second bar which provides an output torque opposite to that of an input torque. The two bars are arranged to operate together and to be attached to the same location of respective wheel support structures. Variation of the torsional characteristics of the two bars of the compound arrangement allows the roll stiffness to be varied while also varying the forces which tend to lift the inside wheel when the automobile is moving in a curved path.

Adjustable torsion bar cartridge for face mills

Abstract: A face mill having one or more cartridges for adjustably supporting cutter inserts on the end face of the rotating tool body. Each cartridge has a convex arcuate surface seated against a concave arcuate seat surface formed on or in the milling tool body. A torsion bar is integrally extended from the cartridge parallel to the axis of the concave seat surface. Also, a manual adjustment screw is located perpendicular to the axis of rotation of the cartridge for applying an adjustment force to the cartridge in opposition to the action of the torsion leaf spring. The torsion bar applies a pre-load force to the cartridge. The manual adjustment screw exerts an opposing force that rotates the cartridge to a desired position for proper orientation of the associated cutter insert.

Spring loaded locking handle for angle cock or the like

Abstract: A spring loaded locking handle assembly for an angle cock or the like wherein the helical windings of a torsion type spring are mounted on a fulcrum pin about which the handle proper of a two-piece, locking style handle assembly is pivotally connected to the handle socket. One leg of the torsion spring is fixed to the socket via a pilot hole therein and an aligned index hole in the fulcrum pin to properly locate and secure the fulcrum pin in place. The other leg of the torsion spring bears against the handle proper under tension to positively maintain the handle member in its locked position and to prevent accidental operation of the angle cock.

Window sash balance with tension and torsion spring

Abstract: A spring balance for counteracting the weight of heavy window sashes includes both a torsion spring and a tension spring. The two springs are separated by a rigid tube. One end of each spring is connected to an end of the rigid tube. A spiral member engages a follower carried by the other end of the torsion spring and includes a stop along its length for engaging an anchor carried by the other end of the tension spring. The spiral member can be attached by conventional means to a shoe or other connection to the window sash.

Device for connecting screwdriver bits with drive source - consists of two-part socket linked by torque coupling

Abstract: A device for connecting screwdriver bits with a drive consists of a two part socket for the bits (1) and a drive connector (2). A torque coupling couples the two parts (1, 2) and permits relative rotary movement against a flexible damper action. The coupling can be a leaf spring or a torsion bar or two parallel flexible bars. Between the two parts (1, 2) of the socket is a device for converting relative rotary movements into longitudinal movement. USE/ADVANTAGE - Peak loading is absorbed and dampened without special inserts.

Corotron restringing tool

Abstract: A corotron restringing tool includes a locking drum (20) downstream from a spool (30) of corotron wire (31) A torsion spring (65) connected to the locking drum allows wire to be drawn from the spool under under a minimum of tension and subsequently manipulated without placing tension on the remaining wire on the spool An alternative is to use a locking wedge (59) instead of the drum configured such that the harder the wire is pulled, the tighter the wire is held by the wedge

Power steering device for vehicle

Abstract: PURPOSE: To increase a steering force variation width by driving a rotary valve in a way that a torsion bar intended to be twisted by a road surface resistance difference produced along with operation of a handle by a valve drive mechanism so that an assist force attains a target value and effecting drive by means of the force of the twisted torsion bar. CONSTITUTION: A rotary valve 16 is located between an input shaft 11, connected to an oil pump 33 of a steering mechanism 1, and an output shaft 59. A valve drive mechanism 15 wherein a part 42 to be pressed is mounted on the input side and press elements 44a and 44b are mounted on the output side is provided. A control unit 70 sets an assist force range by means of an assist force generated through rotation of a rotary valve 16 in the twist direction of a torsion bar 9 and an assist force generated through rotation in a reverse direction of twist. In which case, a press element drive mechanism 64 drives the press elements 44a and 44b and controls a pressure to the working angle of the rotary valve 16. This constitution increases the variation width of the steering force of a handle. COPYRIGHT: (C)1993,JPO&Japio

Coil spring with several concentric spring element turns - has symmetrical spring elements to attain coincidence of load and geometrical axes

Abstract: The helical coil spring is made from a tubular blank of spring steel, by cutting helical slots in the tube wall so that a continuous, wire-like helical coil remains. The coil is formed integrally with the end supports (8,9) which suit the spring installation requirements. Thus several springs (5,17,18) form the windings round the long centre axis. The springs are symmetrical to provide coincidence of the geometric axis of the spring and the load axis to eliminate the risk of the spring buckling under load. ADVANTAGE - Improved coil spring design and mfr.

Tensioner for belt drive - has tension roller on lever with spiral torsion spring linked to housing

Abstract: A tensioner for a belt drive, for vehicle combustion engine auxiliaries, consists of a tension roller (1) positioned on a tension-lever (2) pivot-mounted in a housing (3). The tension roller is pressed elastically against the belt by a spiral torsional spring (8) linked by one end to the housing, and with its other end acting upon the tension lever. The other end of the spiral torsional spring is attached to the annular disc (5) pivotal mounted in a one-way coupling (6). The tension lever is joined by a torsional spring (4) to the annular disc (5). USE/ADVANTAGE - The belt drive can be driven with a low basic tension.

Wire tension meter

Abstract: A tension measuring device for accurately measuring the tension applied to a fine, metallic wire, or the like, being uncoiled from a spool of wire, or the like. The tensioning device includes a pulley around which the wire is looped. The pulley is rotatably mounted at the end of an arm which itself is mounted on an axle for rotation under the influence of a first torsion spring which biases the arm against the tension forces exerted against the uncoiling wire and a second torsion spring which biases the arm against rotation caused by the weight of the arm and pulley. A knob is provided to twist the first torsion spring to increase the biasing force on the arm and pulley which counteracts the uncoiling tension on the wire. A pointer is associated with the knob and it moves across a scale indicating the amount of force applied to the first torsion spring. Another pointer is mounted on the arm and it moves across a second scale indicating movement of the arm above and below a zero point. A mechanism is provided for accurately zeroing the arm pointer by adjusting the tension force applied by the second torsion spring to overcome the weight of the arm and its pulley.

Use of shape-memory alloys - by means of wire-wound torsion element

Abstract: Device is based on the reversible transition from a martensite phase into an austenite phase. A prestressed wire (3) made of an alloy is wound onto a prestressed torsion element (2). In addn. to the form change capacity, the different moduli of elasticity of the wire for different phases are utilised in the device. The wire is pref. fixed to one end of the torsion element (2) before its prestressing; after its prestressing it is fixed to the other end. The wire (3) is inductively heated. The torsion element (2) can be a rod or a tube. It can be made up of tubes of different diameters arranged inside one another in such a way as to produce the effect of a single stepped tube. The material of the torsion element is Al, while the material of the wire is a Ni-Ti alloy. USE/ADVANTAGE - As a controllable torsion element without moving pts. subjected to wear, e.g. to control of the angle of aerodynamic surfaces, control of wing flaps, regulation of torsion bar levels in cars, and control of valves in heating systems.

Torsion bar making it possible to take up the play on backrest articulations of a seat

Abstract: The torsion bar making it possible to take up the play in articulations of the backrest of a seat, is characterised in that the frame (3), generally in the form of an inverted U, of the backrest of the seat, the lower ends (3a, 3b) of which are secured to moving parts of the articulation mechanisms and are connected to one another by a transverse torsion bar (8) providing two movements in opposite directions on the bottom points of the frame (3) of the backrest, thereby creating a slight torsion of the upper part of the hoop forming the frame of the backrest, via a backward downward movement on one side of the backrest and a forward downward movement of the other side of the backrest thereby taking up the play in the mechanisms by which the backrest is articulated with respect to the seat part of the seat.

Torsion suspension for a single axle

Abstract: A suspension system for a vehicle having a torsion spring interconnecting the wheels and axle to spaced portions of the frame via suspension arms wherein each suspension arm has one end secured to one element of the torsion spring and its other end connected to one end portion of a torsion type shackle. The other end of the shackle has its outer shell connected to the vehicle frame via replaceable shims that adjust the height of the vehicle frame relative to the axle and the ground.

A vehicle suspension system having an adjustable anti-roll bar

Abstract: An hydraulic system for adjusting springing means, such as an anti-roll torsion bar, in a vehicle suspension system comprises two valves (12, 13) each with three ports, arranged and connected to one another to supply fluid under pressure from a source (P) thereof to either side of an actuator (10, 11) for the springing means or to return fluid to a reservoir by way of a relief valve (14). Separate front and rear anti-roll bars are provided.

Vehicle sliding door

Abstract: Sliding door system for vehicles has the weight of the door suspended from the rigid roof of the vehicle on a track 20 through two arms 30, 36, the front arm 30 located as far forward as the vehicle package permits, and the rear arm at the rear edge of the door A second, steadying track (48, fig 36) is sited behind the door and lower down on the body side A torsion bar 42 interconnects upper and lower swing arms and a torsion bar 52 connects the upper arms and the vehicle door Torsion springs 44, 46 swing the door out of its aperture

A device for interrupting a material flow

Abstract: A device is set forth for interrupting a material flow by means of a shutter 5 fastened on a spindle 11, which spindle 11 is rotatably supported in a housing 1 of the device. The device is provided with a torsion spring 33 which is elastically deformable through rotation of the spindle 11, with substantially equal amounts of mechanical energy being stored in the torsion spring 33 through elastic deformation in a first position of the shutter 5. The material flow is shut off during this operation, and in a second position of the shutter 5 the material flow begins. The spindle 11 is provided with a permanent magnet 57 having pole shoes 61, 63 which are held against stops 109, 115 of a magnetic yoke 99 in the first position under the influence of the magnetic field of the magnet 57, and which are held against stops 111, 113 of the yoke 99 in the second position. The yoke 99 is provided with an electric coil 121. The shutter 5 is displaceable from a rest position to one of the two positions by an alternating current in the coil 121, whereas a direct current in the coil 121 attenuates the magnetic field of the magnet 57, so that the shutter 5 is displaced from the relevant position to the other position under the influence of the torsion spring 33. The device is suitable for use in a system for the deposition of materials in the form of thin layers on substrates. In such a system, the shutter 5 periodically interrupts a material flow coming from a source of material and aimed at the substrate, so that a desired composition of the layer is obtained.

Hose or cable reeling device

Abstract: A hose or cable reeling device has a support (1) with a rotatably mounted drum (7) onto which a hose (8) or cable is reelable or windable, whereby the drum (7) cooperates with a spring device (10) which is provided to rotate the drum (7) in a reeling or winding direction (B) for reeling or winding-up the hose (8) or cable thereon, whereby a locking device (21) on the drum (7) and a latch (22) on the support (1) cooperate with each other in such a way that said latch (22) can be moved from a neutral position (N) to a lock position (S), in which it prevents the drum (7) from rotating in the reeling direction (B) and whereby the latch (22) cooperates with a torsion spring (37) in such a way that said latch (22), when the drum (7) moves it in direction (X) from the neutral position (N), is subjected to a spring force by the torsion spring (37) in a direction (Y) towards the neutral position (N). According to the invention, the torsion spring (37) is provided in preloaded condition on an axis of rotation (29) about which the latch (22) can be turned or pivoted such that said torsion spring (37) affects said latch (22) in the direction towards its neutral position (N) already at the beginning of the movement of said latch (22) in the direction (X) therefrom.

Power steering device

Abstract: PURPOSE:To transmit the load torque on an input shaft due to steering perfectly to the output shaft by providing serration on either the periphery of a torsion bar or the bore of an input shaft insert hole, caulking the input shaft insert hole part, and securing the torsion bar to the input shaft. CONSTITUTION:The outer end of an insert hole 1d concentrical to the input shaft 1 is blocked, while the other side end part 4b of a torsion bar 4 inserted in this insert hole 1d is equipped with serration 20. The input shaft 1 is swaged 19 is in the mating part of this serration 20, nd thereby the torsion bar 4 is fixed concentrically to the input shaft 1 sturdily. Accordingly the torque given from the steering shaft to the input shaft 1 is transmitted certainly to the output shaft 2 through the torsion bar 4 without loss. That is, the teeth of serration 20 are bitten into the bore of the insert hole 1d of the input shaft 1 by swage 19 to ensure sturdy coupling, and the outer end of the insert hole 1d is blocked, so that no O-ring 18 is required for the torsion bar 4 and there is no risk of generation of inconvenience due to wear to lead to enhancement of the reliability.

Height adjusting device with torsion bar for vehicle

Abstract: PURPOSE: To adjust the height of a vehicle without changing the spring constants of torsion bars, and also to enhance the mountability to the vehicle. CONSTITUTION: A height adjusting device comprises a first torsion bar 10 that is connected to a suspension arm 14 at its one end and is twisted around the axis 10a by the pivotal movement thereof, and a second torsion bar 12 that is fixed to a vehicle body 18 at its one end; and the other ends of these torsion bars are connected by means of a differential gear 28. The ring gear 36 of the differential gear is turned around the axis by means of an actuator 48, and the side-gears 44, 46 fixed to the other ends of the two torsion bars respectively are relatively turned via a pair of transmission pinions 40, 42, thereby the height can be adjusted. COPYRIGHT: (C)1993,JPO&Japio

Lift-off hinge assembly

Abstract: A checked lift-off hinge assembly (10) including a pair of hinge leaves (11,12) pivotally connected to one another so as to be separable by relative movement along the axis of the pivotal connection, a torsion spring (40) mounted on one of said hinge leaves, the torsion spring extending towards and being co-operable with one or more reaction members (19) on the other hinge leaf to provide a checking force for resisting relative pivoted movement between the hinge leaves (11,12), said one hinge leaf including positional displacement means operable on said torsion spring (40) for moving the torsion spring to relieve spring pressure on the reaction members (19) to thereby enable axial separation of the hinge leaves (11,12).

Suspension device for low-frequency structures

Abstract: A suspension device is provided for simulating the free-free boundary conditions of space for a low frequency structure A support cable is connected at one end to the test structure and is vertically guided by a guiding ring The other end of the cable is connected to a cam having an outer circumference which supports the cable A drive axle passes through the cam center of rotation and is rotatably journalled in a suitable manner to a rigid structure Two torsion springs are provided about the drive axle One end of each spring is connected to a respective face of the cam and the other end is connected to the fixed support The cam is shaped and the torsion springs selected such that Wrsub(t) =T s (t), wherein W is the weight of the test structure; rsub(t) is the instantaneous moment arm defined as the perpendicular distance from the rotational center of the cam to the cable at time t, and T s (t) is the total spring torque exerted by the two springs on the cam at time t The test structure is accordingly vertically suspended by the cable and the instantaneous moment arm compensates for any increased spring torque arising from a vertical displacement of the test structure to simulate space conditions

Measurement of electrical forces using a modified torsion balance and capacitance transducer

Abstract: The attractive force between two conducting electrodes, one charged and the other at nominally zero potential, has been measured using a modified torsion balance whose deflection is monitored by a linear rotary differential capacitance (LRDC) transducer. This device has a resolution of 10−7 rad and is simple to operate. The results for different electrode geometries as a function of separation distance and voltage on the charged conductor agree to ±20% or better with theoretical results, in most cases. In the case of aluminum electrodes, the attractive force is not stable; rather, it varies periodically as the result of an unknown discharge process.