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WO1998030433A1 - Systeme de freinage pour bicyclette ameliore - Google Patents

Systeme de freinage pour bicyclette ameliore Download PDF

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Publication number
WO1998030433A1
WO1998030433A1 PCT/NZ1998/000001 NZ9800001W WO9830433A1 WO 1998030433 A1 WO1998030433 A1 WO 1998030433A1 NZ 9800001 W NZ9800001 W NZ 9800001W WO 9830433 A1 WO9830433 A1 WO 9830433A1
Authority
WO
WIPO (PCT)
Prior art keywords
crank
cable
aperture
spider
arm
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/NZ1998/000001
Other languages
English (en)
Inventor
Jonathan Phillips
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sarun Holdings Ltd
Original Assignee
Sarun Holdings Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sarun Holdings Ltd filed Critical Sarun Holdings Ltd
Priority to AU53510/98A priority Critical patent/AU5351098A/en
Publication of WO1998030433A1 publication Critical patent/WO1998030433A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62L—BRAKES SPECIALLY ADAPTED FOR CYCLES
    • B62L5/00—Brakes, or actuating mechanisms therefor, controlled by back-pedalling

Definitions

  • the present invention relates to an improved brake system for a bicycle or similar chain driven devices.
  • PCT application No. PCT/NZ96/00020 the disclosure of which is herein incorporated by reference.
  • PCT/NZ96/00020 describes an improved braking system which provides a means for augmenting the hand operated brakes on a bicycle.
  • the system disclosed in that application transmits a component of a back pedal force to the brake calipers, via an axle mounted clutch and cable arm attachment. This enhances the braking effectiveness and control of conventional hand operated brakes.
  • the known clutch and sprocket mounting constructions are of relatively complex construction and have not exhibited completely satisfactory durability.
  • the bias cable clamp of PCT/NZ96/00020 can damage the cables which are inserted therethrough. Also, this component is subjected to relatively large forces which both increases the chance of damaging the cable at the point where it is secured within the labyrinth, as well as increasing the susceptibility of the bias clamp itself to damage when in contact with tensioned brake cables.
  • An object of the present invention is to provide an improved mechanism for progressive braking, and parts therefore, wherein conventional hand activated brake callipers are augmented by a force originating from the cyclist's legs, thereby reducing the need for hand strength and allowing the hands greater freedom of movement for steering control.
  • a further object of the present invention is therefore to provide an improved brake system which provides for a smooth continuously variable pedal activated braking force, adapted to augment conventional hand applied brakes, which is durable, strong, of simple construction and may be relatively easily retrofitted to preexisting brake systems on known bicycles.
  • a further object of this invention is to provide a consumer with the useful alternative choice.
  • crank assembly for a chain driven mechanism such as a bicycle, including;
  • journal located at one end of a crank arm, the journal adapted for engagement with an axle
  • a housing incorporating an extension which, in use, a brake activation means is or are attached, wherein the housing incorporates an aperture adapted to receive an integrated roller bearing device, the roller bearing device having a plurality of roller bearings facing inwards and oriented so that when the cylindrical bearing surface is inserted into the aperture, the roller bearings bear against with the cylindrical bearing surface, wherein the integrated roller bearing device, when interacting with the cylindrical bearing surface, operates as a unidirectional continuously variable clutch.
  • the housing incorporates an annular insert adapted to accommodate therein the integrated roller bearing device in such a manner that when the integrated roller bearing device is inserted into the annular insert and the annular insert is then inserted into the housing, the integrated roller bearing device is secured and fixed in relation to the housing by a friction fit.
  • roller bearing device can be secured in the housing by pins or similar means.
  • the axle is preferably a standard bottom bracket axle of a bicycle.
  • a second end of the crank arm may have a connection adapted so that a pedal shaft or cycle pedal can be attached thereto.
  • the journal comprises a cylindrical protrusion extending from the first end of the crank arm at substantially 90° to the lengthwise axis of the crank arm, wherein the substantially cylindrical bearing surface corresponds to a sleeve which is pressed onto the journal and is secured in immovable relation thereto by means of a friction fit or the like.
  • the crank assembly may be frictionally engaged in a known manner to the bottom bracket axle of the bicycle.
  • the housing incorporates a slip-ring adapted to engage the cylindrical bearing surface, wherein the slip-ring is held in either fixed or movable relation to the housing thereby, when held in movable relation, allowing a user to backpedal without engaging the brakes.
  • the slip-ring is locked/unlocked by a locking means, the locking means being actuated by a user.
  • the locking means comprises a locking pin, mounted in the housing, adapted to engage corresponding recesses located in an outer surface of the slip-ring.
  • the locking pin is oriented radially in relation to the rotational axis of the slip-ring with the pin biased so that its default position is to engage a corresponding recess to hold the slip-ring in fixed relation to the housing.
  • the present invention further provides a crank and sprocket attachment assembly incorporating:
  • crank arm and spider are attached by means of a limited movement dog clutch.
  • the limited movement dog clutch incorporates five protrusions located axially around a journal wherein the journal is located at the first end of the crank arm and wherein the spider incorporates corresponding recesses located axially around the perimeter of an aperture located coaxially with the spider hub so that the protrusion and recess configurations are adapted to locate snugly together.
  • the limited movement dog clutch may incorporate five protrusions and corresponding recesses wherein the width of the recesses allows angular movement of the crank with respect to the spider of approximately half the width of one of the protrusions.
  • the spider is rotationally biased against the journal by means of a semicircular spring, or the like, having one end attached to the spider and the other attached to a point adjacent the journal.
  • the spider may be rotationally biased against the journal by means of a coil spring or similar having a first end biased against a protrusion of the dog clutch, and a second end biased against a wall of a recess in the dog clutch, the dog clutch omitting one or more pair of protrusions and recesses wherein the coil spring is adapted to be inserted in an annular channel formed by the omitted protrusion and recess.
  • the present invention further provides a cable bias clamp suitable for use in a bicycle brake system comprising:
  • a locking member adapted to receive a continuous length of cable threaded therethrough wherein a cable entry aperture and a cable exit aperture are displaced with respect to one another and the locking member incorporates one or more attachment points adapted so that when a force is applied to at least one of the attachment points, an asymmetric tension is applied to the parts of the cable inserted into the entry and exit apertures, wherein the locking member has a shape adapted so that when the length of continuous cable is threaded therethrough, and tension applied thereto, portions of the cable bias against each other thereby preventing movement of the continuous cable through the locking member.
  • the locking member is formed from plate material of thickness sufficient to accommodate cable apertures drilled therethrough in the plane of the plate material, wherein the locking member is cut in the shape of a T, the T including a horizontal portion and an upright portion, said horizontal portion comprising a first and second arm, wherein the locking member incorporates first, second, third and fourth apertures oriented so that a cable can be threaded, in the plane of the flat plate, through the end of the first arm then through the intersection of the upright and horizontal portions through a second aperture whereupon it emerges proximate the junction of the second arm and the upright portion whereupon it is then threaded around an end of the upright portion and then threaded through the intersection of the upright portion and horizontal portion, entering the third aperture at a point proximate the junction of the first arm and the upright portion and emerging at a point proximate the entrance to the second aperture whereupon it is threaded through an end of the second arm.
  • the second and third apertures entrances are located at the same point on the horizontal portion whereby the junction of the second and third apertures are widened to accommodate the cable passing through the second aperture and returning through the third aperture in crossed over relation.
  • the first arm incorporates a protrusion over which the cable is passed after emerging from the first aperture and being inserted the second aperture and the second arm incorporates a protrusion which the cable passes over after emerging from the third aperture and being inserted into the fourth aperture.
  • the upright portion is in the form of a circular portion made from flat plate of thickness sufficient to accommodate the cable apertures therethrough in the plane of the flat plate.
  • the locking member is cut in such a way so that the edges of the flat plate are at right angles to the plane of the flat plate thereby providing a uniform surface against which the cable can bear when placed under tension at the first and fourth apertures.
  • the second and third apertures may be in the form of slots wherein the open portion of the slots oriented towards one face of the T-shaped member.
  • Figure 1 illustrates a side view of a housing and integrated roller bearing device prior to connection to a crank shaft
  • Figure 2 illustrates a section through the housing shown in figure 1 when attached to a first end of a crank shaft and the crank shaft is attached to an axle
  • Figure 3a illustrates a side view of a crank arm
  • Figure 3b illustrates an end view of crank arm prior to engagement with the housing of figure 1 ;
  • Figure 4 illustrates a side sectional view of the crank arm in figure 3b;
  • Figure 5 illustrates a section through the housing shown in figure 1 with the integrated clutch removed;
  • Figure 6 illustrates a side view of the axle side of a spider and crank connection;
  • Figure 7 illustrates a pedal side view of connection between a spider and a crank arm;
  • Figure 8 illustrates a cross-section through a spider/crank arm connection;
  • Figure 9 illustrates a side section through a crank arm/spider connection;
  • Figure 10 illustrates a side view from the axle side of a spider;
  • Figure 1 1 illustrates a side view from the pedal side of a spider
  • Figure 1 2 illustrates a side view of a cable bias locking clamp
  • Figure 1 3 illustrates a right hand end view of the cable bias clamp shown in figure 1 2.
  • Figure 14 illustrates a side cutaway view of an alternative spider/journal biasing means;
  • Figure 1 5 illustrates a side view of a spider adapted for use with the bias means of figure 14;
  • Figure 1 6 illustrates a crank arm adapted for use with the bias means of figure 14;
  • Figure 1 7a-d illustrates a backpedal locking/unlocking mechanism;
  • Figure 1 8 illustrates a detail of the slip-ring shown in figure 1 7c.
  • crank assembly for use in a foot operated bicycle braking system is shown. It is to be understood that this system may be used in other chain driven mechanisms. However, the following discussion will be in the context of its application to a bicycle.
  • a crank arm 1 7 (shown in plan and side view in figures 3(a) and 3(b)) has, at a first end 23, a journal 22 which is adapted to receive an axle 21 .
  • the axle 21 shown in the present example corresponds to that found in a conventional bicycle.
  • the journal is formed from a cylindrical protrusion 1 8 extending from the first end 23 of the crank arm 1 7.
  • crank arm first end 23 is shown in more detail in figure 4 as a cut away section.
  • the dimensions of the cut away are such as to be compatible with standard axles.
  • FIG 1 illustrates a housing 10 (shown in cross section in Figure 5) having an extension 14 which, in use, is attached to the fore and aft brake cables by means of the bias clamp (see figure 1 2 and 1 3).
  • the housing 10 may incorporate an annular insert 1 1 which is pressed into the aperture 1 3. Inside this insert is pressed an integrated roller bearing device 1 2.
  • the roller bearings (not shown) are located around the inside surface 1 6 of the integrated bearing device.
  • Such integrated roller bearing devices are available from a number of sources.
  • the annular insert is omitted and the integrated roller bearing device is pressed into the housing.
  • the combination of the integrated roller bearing 1 2, housing 10 and, where applicable, annular insert 1 1 form the actuating arm for a unidirectional clutch.
  • the device of figure 1 is threaded or pressed onto a cylindrical bearing surface 1 9 which is threaded or pressed onto the cylindrical protrusion 1 8.
  • the cylindrical bearing surface is in the form of a sleeve 1 9.
  • the cylindrical bearing surface 1 9 is pressed firmly onto the protrusion 1 8 and is fixed in relation thereto (by a friction fit) or the like.
  • the bearing surface could possibly be aided in resisting rotation by means of a mechanical interlocking mechanism.
  • Extension 14 is formed from two adjacent arms, each incorporating an aperture 15 for securing the bias cable clamp (see figures 12 and 13).
  • the bias clamp may be retained by a pin (not shown).
  • Figures 3a and 3b show a top and side view of a crank arm suitable for use with the present invention.
  • a preferred embodiment of the present invention includes a slip-ring 170 (see figures 18a, b and 1 7d).
  • the slip-ring 1 70 is locked in fixed relation to the housing 10 by a locking means 180 (see figures 17a-d).
  • the locking means comprises a barrel 181 threaded into the housing 10.
  • a locking pin 182 moves within the barrel 1 81 and is biased in a protruding position by a coil spring 183. The coil spring biases against a bearing face 185.
  • the pin is moved within the barrel by a cable and lug 184 and 186 respectively.
  • the locking pin 182 engages with recesses 171 a, b, c.
  • the cable 184 is withdrawn. This disengages the locking pin 182 from recesses 171 a, b, c and allows the slip-ring 1 70 to rotate in the housing 18.
  • the sprockets (not shown) are connected in a known manner to a spider 26 by means of holes 28 and bolts (not shown).
  • a degree of relative movement between the spider (or sprocket hub) 26 and the crank arm 25 To ensure that there is no lockup when a rider restarts forward pedalling after braking via back pedalling, there is provided a degree of relative movement between the spider (or sprocket hub) 26 and the crank arm 25.
  • the crank arm 25 incorporates, at a first end, a male part of a limited movement dog clutch represented by dashed lines 32.
  • the male part of the limited movement dog clutch includes five protrusions 50.
  • the male limited movement dog clutch incorporates a hub 51 and the hub and protrusions may be machined from a separate piece of metal and then attached by press fitting to the first end of the crank arm 25.
  • the male part of the limited movement dog clutch has a limited degree of angular movement within a female parts cavity 29. The amount of movement is governed by the angular width of the corresponding female recesses and, in the present example, is shown as being approximately one half the width of the protrusions 50.
  • the load is brought to bear against the female dog clutch cavity face 33 in five different locations at once, thus distributing the forces and reducing wear and tear on the protrusions and their corresponding bearing surfaces. Opposite angular movement bears against corresponding opposite dog clutch faces.
  • a cross- section of the arrangement is shown in figure 8 whereby a cross-section of a protrusion 30 is shown at the junction of the outer edge of the female dog clutch cavity 31 .
  • the limited movement dog clutch is sealed by means of 0 rings 52 and 53 and the spider or hub is located in place by means of a circlip 54 and washer and 55.
  • a side view from the pedal and axle side respectively of the spider incorporating the female part of the dog clutch are shown in figure 10 and 1 1 .
  • Figure 6 illustrates the biasing means 30 which biases the crank arm 25 against the hub or spider 26.
  • a spring 30 acts as a return spring and absorbs the shock when the cyclist begins forward pedalling.
  • FIG. 14 An alternative and preferred embodiment is shown in figures 14, 1 5 and 1 6.
  • one of the dog clutch protrusions 50 is omitted (see figure 1 6).
  • a corresponding recess and bearing surface 33 is removed from the spider leaving an annular channel.
  • a coil spring 140 (see figure 14) having a first end 141 which bears against a protrusion 50 and a second end which bears against a bearing surface 33.
  • FIG 1 2 an example of a cable bias clamp is shown.
  • a bias clamp comprising a block having a labyrinth through which a continuous cable was threaded, was disclosed.
  • This construction while providing the required tension bias, proved problematic.
  • tensioning and/or securing the cable by means of the screw oriented at right angles to an aperture through which the cable passes, the screw tended to crush and damage the cable in the labyrinth.
  • a cable bias clamp locking member 45 is shown. This is in the shape of a "T" when figure 1 2 is rotated through 90° (anticlockwise).
  • the horizontal portion of the T corresponds to the horizontal portion 70 (formed from a first and second arm 46 and 47 respectively) and the upright portion 71 .
  • the horizontal portion 70 incorporates two protrusions 53 and 54 over which the cable passes prior to passing through the member.
  • the upright portion is circular and filleted into the cross piece at their junction.
  • the locking member is formed from flat plate having square cut edges. These edges provide the surface over which the cable passes and bears against when tensioned.
  • a and B arrowed
  • the cable is inserted into a first aperture 48 whereupon it is bent over a first protrusion 53 and inserted into a second aperture 51 .
  • the cable is threaded through and passed around the upright portion 71 and inserted through the third aperture 50.
  • the cable is then passed over the second protrusion 54 and threaded through the fourth aperture 49.
  • Apertures 50 and 51 exit at a common point 52 which is of width sufficient so that the cables can be crossed one over the other.
  • the cable when tension is applied between the two parts of the cable entering at A and exiting at B respectively and a pin passing locating any of apertures 60,61 or 62, the cable is locked off and cannot be moved from the labyrinth.
  • the cable can be adjusted relatively easily by loosening the cable over the protrusions 53 and 54 and around the upright portion 71 . This loosens the cross over or bias point 52 thereby allowing adjustment.
  • the cable threaded through the device 45 is tightened, it is effectively secured.
  • a range of connection positions or attachment points 60, 61 and 62 are provided. These provide asymmetric braking between the fore and aft wheels of the bicycle. If the centre attachment point 62 is used to thread the pin 1 5 through the extension 14 (see Figure 2), the braking force is equal. Alternatively, threading the pin through the aperture 1 5 and through the cable clamps and hole 60 in the extension 14 causes an asymmetric braking action.
  • the ratio of fore/aft braking is governed by the location of the holes 60 and 61 along the lengthwise axis of the cross-section arm 70. Three possible positions are shown in figure 1 2, however a larger number may be viable depending of the overall dimensions of the cable bias clamp.
  • a right hand side view of the cable bias clamp shown in figure 1 2 is illustrated in figure 1 3.
  • third and fourth apertures are open to the surface of the body. This can aid in locating the cable through the labyrinth.
  • the apertures 50 and 51 are fully enclosed and penetrate through the cable bias clamp block.
  • the cable is attached to the brake cable adjustment and connection means as described in PCT/NZ96/00020.
  • the present invention provides for improvements in the handling characteristics of a foot operated hand brake augmentation system.
  • the novel construction provides for a significantly more durable and long lasting device and, in the case of the cable bias clamp, provides a stronger, more easily adjustable cable biasing element.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mechanical Operated Clutches (AREA)

Abstract

L'invention concerne un système de freinage pour bicyclette amélioré, que l'on actionne avec le pied. Une première invention consiste en un ensemble croisillon placé côté chaîne, conçu pour éviter tout blocage lorsque le cycliste redémarre en pédalant en avant, après avoir freiné en pédalant en arrière. A cet effet, l'invention permet d'obtenir un degré de mouvement relatif entre le croisillon (ou moyeu de pédalier) (26) et la manivelle (25). Le mécanisme d'engagement comprend un accouplement à crabots (51, 33) à mouvement limité permettant un mouvement de rotation limité entre le croisillon et la manivelle. La manivelle est maintenue en appui contre le moyeu de pédalier ou le croisillon au moyen d'un mécanisme à ressort. Le ressort fonctionne comme un ressort de rappel et absorbe le choc lorsque le cycliste commence à pédaler en avant. Une deuxième invention consiste en un accouplement à roulement à rouleaux unidirectionnel monté de façon à ne former qu'une seule pièce avec l'extrémité de l'axe de la manivelle. Le composant obtenu peut être monté sur un axe de pédalier préexistant et peut être relié à des moyens qui actionnent les freins avant et/ou arrière. Une troisième invention consiste en un système de maintien réglable destiné aux freins avant et/ou arrière, à savoir un nouvel organe de blocage par prétension. Ledit organe se présente sous la forme d'un dispositif de blocage intégré pourvu d'un labyrinthe de manière que lorsqu'un câble de frein est passé par le labyrinthe, il se tend lui-même et l'organe de blocage par prétension bloque alors le câble de frein. Ledit organe constitue également un moyen permettant de régler les forces de freinage avant et arrière en fonction de l'utilisateur. Le réglage se fait grâce à l'emplacement spécifique du raccordement entre les moyens d'actionnement des freins et l'organe de blocage. Ce système amélioré pour bicyclette peut également être utilisé dans pratiquement n'importe quel dispositif entraîné par chaîne, en particulier pour les vélos tout-terrain, pour lesquels le freinage manuel peut s'avérer inadéquat ou pénible.
PCT/NZ1998/000001 1997-01-09 1998-01-09 Systeme de freinage pour bicyclette ameliore Ceased WO1998030433A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU53510/98A AU5351098A (en) 1997-01-09 1998-01-09 Improved bicycle braking system

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NZ31404397 1997-01-09
NZ314043 1997-01-09

Publications (1)

Publication Number Publication Date
WO1998030433A1 true WO1998030433A1 (fr) 1998-07-16

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ID=19926105

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NZ1998/000001 Ceased WO1998030433A1 (fr) 1997-01-09 1998-01-09 Systeme de freinage pour bicyclette ameliore

Country Status (2)

Country Link
AU (1) AU5351098A (fr)
WO (1) WO1998030433A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7630690B2 (en) 2002-04-12 2009-12-08 Interdigital Technology Corp. Access burst detector correlator pool
DE102012017690A1 (de) * 2012-09-07 2014-04-03 Joachim Trommlitz Rücktrittbremse für Fahrräder

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2270139A1 (en) * 1974-05-07 1975-12-05 Sirio Sa Prod Rear cycle brake operated by back pedalling - has adaptor around crank spindle and ratchet system pulling brake mechanism
GB2028736A (en) * 1978-08-28 1980-03-12 Foster E Back-pedal brade assemblies for bicycles
US4199046A (en) * 1977-01-28 1980-04-22 Winnett Boyd Brake actuator for bicycles and the like
US4235046A (en) * 1977-11-14 1980-11-25 Metallwerk Max Brose GmbH & Co. KG Window operating mechanism
US4854426A (en) * 1987-07-10 1989-08-08 Pujol Y Tarrago S.A. Handbrake compensator for motor vehicles
US5337861A (en) * 1993-02-16 1994-08-16 Anthony Romano Back pedal brake for derailleur bicycle
US5524733A (en) * 1994-07-22 1996-06-11 Wen; Chun T. Adjusting device of brake rods for bicycles
AU5127096A (en) * 1995-03-17 1996-10-08 Sarun Holdings Limited Improved brakes for bicycles and other chain driven mechanisms

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2270139A1 (en) * 1974-05-07 1975-12-05 Sirio Sa Prod Rear cycle brake operated by back pedalling - has adaptor around crank spindle and ratchet system pulling brake mechanism
US4199046A (en) * 1977-01-28 1980-04-22 Winnett Boyd Brake actuator for bicycles and the like
US4235046A (en) * 1977-11-14 1980-11-25 Metallwerk Max Brose GmbH & Co. KG Window operating mechanism
GB2028736A (en) * 1978-08-28 1980-03-12 Foster E Back-pedal brade assemblies for bicycles
US4854426A (en) * 1987-07-10 1989-08-08 Pujol Y Tarrago S.A. Handbrake compensator for motor vehicles
US5337861A (en) * 1993-02-16 1994-08-16 Anthony Romano Back pedal brake for derailleur bicycle
US5524733A (en) * 1994-07-22 1996-06-11 Wen; Chun T. Adjusting device of brake rods for bicycles
AU5127096A (en) * 1995-03-17 1996-10-08 Sarun Holdings Limited Improved brakes for bicycles and other chain driven mechanisms

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7630690B2 (en) 2002-04-12 2009-12-08 Interdigital Technology Corp. Access burst detector correlator pool
DE102012017690A1 (de) * 2012-09-07 2014-04-03 Joachim Trommlitz Rücktrittbremse für Fahrräder

Also Published As

Publication number Publication date
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