US2190400A - Spring-controlled mechanism - Google Patents

Spring-controlled mechanism Download PDF

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US2190400A
US2190400A US169014A US16901437A US2190400A US 2190400 A US2190400 A US 2190400A US 169014 A US169014 A US 169014A US 16901437 A US16901437 A US 16901437A US 2190400 A US2190400 A US 2190400A
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lever
spring
force
servo
movement
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US169014A
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English (en)
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Carwardine George
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Herbert Terry and Sons Ltd
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Herbert Terry and Sons Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
    • B60T13/02—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with mechanical assistance or drive
    • B60T13/04—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with mechanical assistance or drive by spring or weight

Definitions

  • mechanism provided with a servo device for exerting pressure between two engaging surfaces and with a forcetransmitting member that takes part in bringing the surfaces into and out of engagement, is fur- 14o nished with a gripping mechanism which is so associated with the force-transmitting member and the servo device, that the clutch permits the servo device to remain inoperative as the forceexperiences the reaction due to the engaging .sur-
  • the brake pedal or lever is arranged to undergo an initial movement in applying the brakes during which the force-transmitting member'is moved through the medium of the pedal lever to bring the braking surfaces into engagement. Then, when the force- H "transmitting member experiences the resistance due to contact between the surfaces, further movement of the pedal lever relatively to the force-transmitting member results in the operation of the g ipping mechanism.
  • the said transmitting 'member is connected through the medium of the usual brake linkage to the brake shoes, and inthe initial movement there is no resistance to the movement of the force-transmitting member except that due to friction and that due to the light springs in the brakes which tend always to withdraw the brake shoes from the drums.
  • Figure 2 is a side elevation of a second mechanism
  • Figure 3 is a sectional plan of part of a modification of the mechanismqof Figure2;
  • Figure 4 is a side elevation of a third mechar nism Figure 7 shows a detail of the mechanism of Figure 6 to an'enlarged scale;
  • Figure 8 shows the view seen when looking in the direction of the arrow VIII in Figure 7;
  • Figure 9 is a sectional elevation of a fifth mechanism
  • Figure 10 is a sectional elevation of a sixth mechanism
  • Figure ll is a side elevation of 'a modification of the mechanism of Figure 10;
  • Figure 12 is a diagrammatic elevation of part of a further modification of the mechanism of Figure 2.
  • Figures, 13, 14 and 15 are diagrammatic perspective views each showing the mechanism of Figure 1 connected to brakes through a linkage
  • the arrangee ment is such that the vehicle brakes are applied through the medium of a linkage including a link b pivoted to a force-transmitting member in the form of a lever 2 which in turn is under the control of an operating element constituted by a pedal lever I.
  • a pedal lever I When the latter is moved so as to apply the brakes it is swung about the axis of a spindle B through a small, initial angle as the brake shoes are brought into contact with the brake drums.
  • the lever 2 moves as if integral with the lever I, the lever 2 being held against a stop 3 on the lever i by a spring i.
  • a spring i As soon, however, as the brake surfaces engage, there is substantial resistance to further movement of the lever 2.
  • This ratchet clutch comprises a lever l carrying teeth 8 and a member Q carrying an arcuate row of teeth It.
  • the servo device comprises a telescopic strut i2, the two parts of which are formed respectively with plane surfaces bearing respectively against a fixed pivot pin, l3 and againsta pivot pin M mounted on the clutch member 9.
  • a compression spring I5 tends always to expand the strut.
  • the servo mechanism Before the ratchet clutch is engaged, the servo mechanism is in the position shown in Figure l with the axis of the pin it beneath the plane containing the axes of the spindle Ii and pin it and the spring I 5 tending to swing the telescopic strut anti-clockwise about the axis of the pin it (by reaction on the clutch member 9) Such anti-clockwise motion is prevented by engagement with a plate It forming part of the fixed supporting structure for the mechanism.
  • lever Elli? is connected to the middle one of three levers 286 fixed to a shaft 2135 mounted to turn about its axis.
  • the two outer levers 205 are connected respectively by links 284 to levers 203 by which the pairs of brake shoes 208 are operated.
  • the links 5, 2i)? and 2M, together with the levers. 2m, 20s and 203, and the shafts 2min. and 285, constitute the aforesaid brake operating linkage.
  • the linkage shown in Figures 13 to 15 represents the kind of linkage usually employed in mechanical brake systems. Being metallic, it It obeys Hookeslaw has considerable, resilience. and may be regarded as a simple spring.
  • the spring constituted by the linkage is strained, one end'of this linkage'being held firm by the engagement of the drums 2! with the shoes 29%. of torsion in the shafts 2G5 and 288, stretch in the links 264, 201 and 5 andbending in the This straining is made up.
  • the strained linkage may be regarded as pushing hard against the brake shoes at one end to cause considerable friction between the brake surfaces and as pushing hard against the combined effort of the servo spring and the driver at the other end.
  • the brake linkage may not be such as to permit sufficient movement of the lever 2 and a correspondingtransference of energy from the servo spring 15 and from the drivers foot to the brake linkage.
  • a further 'spring such as the spring 209 indicated by dotted lines in Figure 15 can be inserted to formpart of the brake'linkage. The insertion of this spring is tantamount to putting one spring in series with another, the brake linkage being, as mentioned above, in the nature of a spring.
  • the rows of teeth 8 and I areso shaped that duringthe initial movement to bring the pin M to the dead-centre position, they remain in engagement and that after the deadcentre position has been passed the expanding spring 15 keeps them in engagement.
  • the strained linkage is allowed to return the strut I to the dead-centre position the two parts of the ratchet clutch are still :held together, as in the brake-applying movement, on account of'the opposition of the stresses respectively in the linkage and in the spring l5 tending to turn the members 2 and 9 in opposite directions, the teeth be ing so shaped that the spring 4 cannot separate them.
  • the dead-centre position is passed on the return movement the forces, by then very small, due respectively to the relaxing linkage and the spring l5 are in the same direction so that the spring 4 is able to separate the two. parts of the clutch.
  • the pedal lever ll causes the links 20 to thrust the shoes 25 and the tube 26 as a unit to the right.
  • the tube 26 engages slidingly within a guide 25a and fits over the actuated rod 2! of a spring servo 'unit S, including a servo spring S which initially lies'slightly to one side of a dead-centre position with respect to axes A and A of members S and S between which the spring S is connected and which have arcuate surfaces S and S which roll on each other as the rod 21 is .40 moved. longitudinally.
  • the members S and S are pivoted respectively to a fixed rod S and to the rod 21 which is constrained to move in alignment with the rod S During a small initial part of the movement to the right of the tube 26, the rod 21 is pulled to the right by springs 28 connected between pins 29 and 30 mounted respectively on the tube 26 and the rod 21.
  • a small yielding catch M is provided to locate the tube 2% in the initial or fully off position of the servo unit.
  • the springs 28 are provided in case circum-i-m stances should arise that cause the servo rod 21 to be shottothe right, when the pedal lever 41 is in the initial position shown in Figure 2 and the shoes 25 are consequently not gripping the tube 26. If this should happen the brakes could e7 not be applied in the absence of the springs 28 because the shoes would simply grip the rod 26 and prevent the pedal lever H from being moved further.
  • the springs 28, however, allow the tube 26 to be moved to the right relatively to the rod 2'! if these abnormal conditions arise, the brakes being applied by foot pressure without any help from the servo unit S.
  • Figure 3 shows a modification of the construction in Figure 2 in which the shoes 25 are replaced by wedge members 32 hearing on each side of the square tube 2%.
  • the wedge members 32 are connected to the pedal lever ill by a pair of links 33, the latter corresponding to the links 20.
  • thrust is transmitted, from the links 33 and the wedge members 32, through a spring 34 to an external member 35 which in turn is connected by a pair of links 36, equivalent to the links it, to the lever l8.
  • the Wedge members 32 and.
  • the moving parts are supported between two plates 38 which, in turn, are connected through the medium of bushes 39 to the vehicle chassis.
  • a spindle 40 carrying a spacing sleeve extends between the plates 38, and the sleeve ll serves as a fulcrum for a rotatable force-transmitting member t2 connected by linkage, including a link G3, to the brake shoes.
  • the link corresponds to the link 5 in Figures 13 to 15.
  • the rotatable member 42 is formed, as shown in Figure 5, with a flange portion and a bush portion through which the sleeve M passes, while an annular plate 44 is screwed on to the end of the bush portion remote from the flange portion.
  • a pedal lever 45 is secured to a flange member at, pivotally mounted upon the outside of the bush portion of the rotatable member
  • the flange member 46 is connected by pins ll to a'flat ring 28, the arrangement being such that the flange member and ring must always rotate together about the axis of the sleeve ll but are capable of independent relative movement along that axis.
  • the clutch element 53 is, as shown in Figure 5, pivotally .mounted on a sleeve integral with the flange member 46.
  • a spring BI is able to exert a turning moment on the clutch element 53, so that during continued movement of the pedal lever 65 the relaxing spring 6
  • the struts 60, through which the spring force is transmitted to thegclutch element are formed, as shown in Figure 4, with aper tures, the surfaces of-which have'flat portions against which the pins and 5? bear.
  • a pedal lever 62 is arranged to be swung in the direction of the arrow Bin 'order to apply the brakes.
  • the pedal lever 52 is divided Within the easing into two parallel arms 62abetween which are pivoted a telescopic strut 63 and a connecting member it.
  • the latter comprises two parallel parts 64a joined by transverse parts Mb carrying respectively a pair of pins 1.65 in recesses, themember 64 being in the form of the letter H when viewed in plan.
  • the parts 64d of the connecting member 64 are formed with parallel slots 66 (see particularly Figure 7) which receive respectively pins 6'! that are carried, in
  • the horizontal components of the reactions at the outer ends of the struts ID are reversed so that the bell crank levers I4 and. 15 are swung about the trunnions 11 away from the pins 80.
  • the links 84 connect pins 86, on the bell crank .levers I5, with pins 81 on the gripping shoe 82,
  • a pedal lever 90 forms part of a toggle, the other link of which is a strut M which bears atone (end on a pin 92, carried by the, pedal lever ii0yand" at the other end one, pin- 03, carried by a lever 94.
  • a servo spring95 before the braking surfaces are brought into contact, holds the toggle inthe position shown in Figure 9 with the proximal ends of the two toggle members 00 and 0! tending to move to the left but being prevented from doing so by the engagement, of a pin 05, on the pedal lever 90; with one end of a, slot 01' in a lever 98.
  • the lever 94 is pivoted at its right hand end to a. bell crank lever 00 which, in turn, is
  • aplate IIlI The latter is carried by links I02 and I03, pivoted at their upper ends to the casing containing the mechanism.
  • the links I02 and I03 form with the, plate I 0
  • the servospring 05 and the toggle members90 and BI are so arranged that during the initialmovement of the brake lever 90, prior to the engagement of thelbraking' surfaces, the servo spring and toggle simply act as if they were third and fourth links like the links I02 andl03.
  • lever I05 can no longer swing in an anti-clockwise" direction, so that the continued-movement of the pedal lever 90 results in. thecompression of the;
  • a pin IIZ thereon bears against a flat surface H3 on a strut member I I4 held in a strap I I 5 which embraces both the pin IE2 and a pine Ht, which is carried by the lever I05 and which serves as a pivotal bearing for the right hand end of the strut member I It.
  • the effort supplied by the driver is, therefore, transmitted through the pin I I2 and strut member IM to the lever I135.
  • the relaxing servo spring 95 surrenders its energy through the pin H2 and strut member IM, theeffort being transmitted through the strut 9 I.
  • the rising-force resistance provided by the spring I64 combined with the falling-force characteristic of the servo spring 95, maintains a more or less constant or slightly rising-force to resist the relative displacement between the pedal lever QII and the force-transmitting lever I05.
  • the spring The purpose of this 69 in the construction of Figures 6 to 8. functions similarly tothe spring I04 in Figure 9.
  • I long levers H9, the telescopic lever I29, and the lever 'IZI move as a unit with the pedal lever H3.
  • the motion is transmitted to theb rake' shoes through.
  • a force-transmitting lever I24 which ,is moved by the long levers H9 bearing upon rollers'I25 carried by a strut I28 formed with a fiat surface I27 that bears on a pin I28
  • the fiat surface I27 carried by the lever I24. forms part of the boundary of an aperture in which the pin I28 lies. is formed at the other end of the strut I26 and this contains a pin I29 carried by the pedal lever When the braking surfaces make contact, so
  • the pivotal connection between the lever I2I and the long arms H9 is provided by the journal Mt which passes through" slots I II in the long arms H9 and which carries a roller I42.
  • the latter under the horizontal component of the and which is held in tension so long as the servo spring I22 holds the pin I23 in the position shown in Figure 10, is released as soon as the strut I29 caused to carry the pin I38 over the dead-centre position, the line of action of the force exerted by the servo spring I29 passes above the axis of the ,journal I49 and beneath the axis of the spindle 1 that the servo spring I22 tends to move the pin I23 away from the lever II9.
  • This anti-clock I IT The turning moment due to the servo spring I22 upon the lever I2I, is then anti-clockwise, so
  • the slots I4I can be dispensed :with andthe journal I carried in plain journal bearings in the long arms H9.
  • the roller I42 and the gripping shoe I' will wrap'upon and grip the rail I43 equally well.
  • pins I528 and IE9 and their associated plane surfaces I36 and I3! at the ends of thetelescopic strut I29 provide a. form of pivotal joint which is used extensively in the struts, and these have apertures which en-- gage the cylinders with suflicient looseness to allow the required degree of rolling to take. place;
  • rollersI25 are .mounted on one side of the strut I26 is to ensure that this strut shall take up the position shown in Figure I2 I, in effect, causes the roller I42 and the gripping shoe T removed from the brake pedal.
  • Figure 11 shows a modifiedform .of gripping arrangement for the mechanism of Figure 10.
  • the rail I43 is replaced by two arcu ate strips I49 interleaved at their ends between resilient rubber blocks I591).
  • a pad ofv friction material I5I is mounted to slide between the strips I49, and the long levers II9 carry pins I52 projecting between the strips I49 at each end of the pad I5I,so that the latter swings with the long levers H9.
  • the arcuate strips I49 are gripped tightly between the roller I42 and the'shoe I45, while the pad I5I is gripped tightly between the strips I49.
  • a weight may be provided, in such a manner as to ensure that the clutch shall not be operated and the servo spring caused to move over the deadcentre position until the braking surfaces contact, thereby eliminating any danger of the brake linkage being strained during the wrong part 01 the movement of the pedal lever, and the consequent risk of the parts not being returned to their initial positions when they drivers effort is
  • the weight may be attached to extensions of the levers 2
  • a counterweight may be mounted on an arm extending from'the telescopic strut to the right and in alinement therewith.
  • Figure 12 shows a modification of the construction shown in Figure 2.
  • a square tube I52a equivalent to the tube 26 in This rolling action causes through the medium of a link I53, 2. bell crank initial movement, the bell crank lever I55, the
  • a force-transmitting lever I5Ia pivoted about a fixed axis I58, undergoes equivalent movement, the, pedal lever I5GA being connected to the lever I 5Ia lever I55, a shoe I51, a three-armed lever I55 and a link I54.
  • The'bell crank lever I55 and the three-armed lever I55 are pivoted to the shoe I5? respectively at I63 and I54.
  • the rollers I55 and I65 simply roll on the top of the square tube I52a, while the shoe I 57 is carried to the left and remains out of engage- I52a.
  • the force-transmitting lever I5I is held back as the pedal lever I50A continues to swing in a clockwise direction.
  • the rollers I65 and I66 separate slightly, while the bell crank lever I55 swings in an anti-clockwise direction, and the three armed lever I55 swings in a clockwise direction, the stop projections I58 and I59 moving upwards,-away from the stop surface I65.
  • shoe I5! is therefore raised so that a layer of friction material on its supper surface engages the underside of the square tube I52a. The latter is thus gripped tightly between the shoe I51 I 66. Then, however,
  • lever I5tla causes the rollers I65 and IE6, the square tube I52a, and the shoe I57 to move to the left as a unit, causing the force-transmitting lever I5Ia. again to swing in a clockwise direction under the combined force exerted by the servo unit and by the effort of the driver.
  • the three-armed lever I56 acts prior to the bell crank lever I55 because the momentexert'ed by the spring I52 about the axis 6 1 is less than that exerted by the spring about the three-armed lever E55, and the purpose of l the axis I63.
  • this weight is the sameas that of the weights. mentioned above that can be applied to the other illustrated constructions.
  • surface I65 In the event of the pedal lever Ilifla'beinggiven'a sharp initial move? surface I65, preventing the operation ofthe gripping elements and forcing the force-transmitting lever I5 id to follow the pedal lever I5ta until the braking surfaces contact.
  • a force-transmitting member adapted to be 019- eratively connected to one of the'friction surfaces and operatively connected to said operating element so as to be moved by a force applied to said operating element to bring the friction surfaces into engagement
  • a gripping mechanismconnect-- ed to be operated by movement of said operating element relatively to said force-transmittingmember when resistance to the movement of the latter is set up by engagement of the friction surfaces
  • a servo spring arranged to be rendered effective, uponfurther movement of said operating element, to act throughsaid gripping mechanism and to expend energy on said force-trans- 5d mlttmg member in association with the force ape, 1
  • Mechanism for bringing two friction'surfaces' into engagement, forcing the surfaces tightly to gether when in engagement to increase the fric-v tion therebetween, and subsequently separating the surfaces said mechanism comprising in com-, bination a force-transmitting member adapted to be operatively connected to one of the friction surfaces, an operating element operatively con nected to said force-transmitting member to move v I said force-transmitting member to bring the friction surfaces together during a first movement; of said element and to undergo further movement relatively to said force-transmitting member while the latter is held substantially stationary-due to the reaction of the friction surfaces in engagement, a servo spring, and gripping mechanism,
  • a force-transmitting member adapte'dto beoperatively connectedtoyone ofv the friction surfaces and operatively connected to saidoperating element so as to be moved by-a force applied to.
  • said operating element to bring the friction surfaces into engagement
  • a resilient connection between said operating element and said force-transmitting member agripping mechanism having elements connectedto be brought into engagement witheach other bymovemen't of said operating element relatively to, said force transmitting member when resistance to movement of said forcetransmitting member is set up by engagement of the friction surfaces
  • a servo spring opera
  • an operating element connectedto act upon'said v force-transmitting member to bring (the braking surfaces into engagement, a gripping mechanism connected to be operated upon said force-transmitting member being held up bythe resistance setup due to the engagement of the braking surfaces while movement of said operating element continues, and a servo device, inclu ding a spring to provide the servo' force, normally free of said force-transmitting ⁇ member and in stable equilibrium but connected to be rendered capable of acting on said force-transmitting" member by means of said gripping mechanism so that said servo device can come into action only.
  • Mechanismfor bringing'two v faces into engagement increasing.
  • said m'ech anism comprising in combination anope'rating element, a force transmitting member adapted to beoperatively connected to'one of the'friction surfaces" and operatively connected to said (o der-'1 ating element so as to be movedby a force applied to said operating element to' 'bring the friction surfaces into engagement, a' gripping'mechan'ism' connected to be operated'by movement of said operating element relatively to saidforceetransmitting member when resistance to the movement of the latter is set up by engagement of the friction surfaces, and a servo mechanism including a lever device mountedfor movement from one side of a dead-centre positionto the other side thereof and also including a" servo spring inoperative engagement with said 1ever device and arrangedto hold said lever" device I slightly tooneside of thedead-centreposition while the frictionsurfaces arebrought into engagement, said servomechanism beingrendered, by operation
  • mechanism for controlling the engagement of braking surfaces, the combination of a force-transmitting member adapted to be operatively. connected to one of the braking surfaces, "an operating element connected to actupon said force-transmitting member to bring the braking surfaces into engagement, a gripping mechanism having elements connected to be brought into.
  • an operating element connectedto act upon said force-transmitting member to bring the braking surfaces into engagement
  • a gripping mechanism havingselements connected to be brought into engagement by the resistance set up upon the engagement of the braking surfaces holding 'up said force-transmittingmember while movement of 'saidoperating element continues
  • a servo device including a spring to provide the servo force, connected to .be rendered capable of act-1 ing on said force-transmitting member only when said grippinglelements are broughtlinto engagement and provide an abutment against whichsaid servo. device. acts.
  • engageanism including a lever device mounted for move.- ment from one sideto the other ofa deadcentre position and also including a" spring in ment of the friction surfaces, and a servo'meche operative engagement with said lever device and arranged to hold said lever device slightly to one-sidelof the dead-centre position while the surfaces are brought into engagement, sai dservo" mechanism being so operatively associated with said g'rippingmechanism and the latter being. so operatively associated with said force-transmitting member'that, subsequently to the engage ment of said gripping mechanism said lever de Vice can be caused to pass over' the dead-centre position whereupon said spring can, in relaxing,
  • the combination of an operating element, a force-transoperating member may be caused to move said [force-transmitting member to bring the friction surfaces into engagement and may then be moved further While said force-transmitting member is held substantially stationary by the resistance set u bythe engaging friction surfaces, a lever device mounted for movement from one side to theother ofa dead-centre position, a servo spring operatively connected to said lever device and arranged to .hold said leverslightly to one side of the, dead-centre position while the friction surfaces are brought into engagement, and a grippring mechanism. operatively associated with said operating element, said force-transmitting. member and said lever device, said gripping mechanism being engaged to provide a connection between said lever device and said force-transmit,-
  • a lever device mounted for movement from one side to the other of [a dead-centre position, a servo spring operatively connected to said lever device and arranged to hold said lever device slightlyv to one side of the dead-centre position while the friction surfacesare brought'into engagernent, said lever device being soassociated with said operating element and with said forcetransmitting member as to be forced over the dead-centre position by said further movement of said operating element, and a gripping mech- .anism connected to be operated by such forcing "'of said operating element overthe dead-centre position and adapted to provide, when so operated, an abutment against which said servo spring canreact in relaxing to expend energy in assistI- ing the further movement of said force-transmitting member to increase the pressure between.
  • Mechanism for controlling the engagement of friction surfaces comprising in combination, a servo unit, a pivotally-mounted operating element,. a pivotally-mounted forcetransmitting member, a linkage including a resilient element connecting said operating element with. said forcertra'nsmitting member and arranged to move as a rigid unit so long" as said,
  • a.gripping mechanism comprising 1 'a'gripping element connected to' said servo. unit and gripping shoes mounted ons'aid linkage and arranged .togrip said gripping element when'said deformation occurs was to provide with said linkage and said clutch element an assembly. whereby further motion of said operating element is transmitted to said force-transmitting member and to said servo unit, the latter being arranged thereupon to assist the further movement'of said force-transmitting member during still further motion of said operating element.
  • Mechanism forcontrolling the engagement of friction surfaces comprising in combination a force-transmitting member pivotally mounted about an axis, an operating element pivotally mounted about the same axis,
  • gripping element pivotally mounted about said.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Braking Arrangements (AREA)
US169014A 1936-10-31 1937-10-14 Spring-controlled mechanism Expired - Lifetime US2190400A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB29651/36A GB484108A (en) 1936-10-31 1936-10-31 Improvements in or relating to spring controlled mechanism

Publications (1)

Publication Number Publication Date
US2190400A true US2190400A (en) 1940-02-13

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Application Number Title Priority Date Filing Date
US169014A Expired - Lifetime US2190400A (en) 1936-10-31 1937-10-14 Spring-controlled mechanism

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US (1) US2190400A (en:Method)
BE (1) BE424382A (en:Method)
FR (1) FR828400A (en:Method)
GB (1) GB484108A (en:Method)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1133994B (de) * 1956-07-16 1962-07-26 Graubremse Gmbh Bremsanlage fuer Fahrzeuge, insbesondere Kraftfahrzeuganhaenger
US4235436A (en) * 1979-01-29 1980-11-25 The Perfection Manufacturing Company Work control apparatus for an exerciser

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FR828400A (fr) 1938-05-17
BE424382A (en:Method)
GB484108A (en) 1938-05-02

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