EP1660279A1 - Outil destine au retrait d'un piston d'etrier de frein - Google Patents

Outil destine au retrait d'un piston d'etrier de frein

Info

Publication number
EP1660279A1
EP1660279A1 EP04768001A EP04768001A EP1660279A1 EP 1660279 A1 EP1660279 A1 EP 1660279A1 EP 04768001 A EP04768001 A EP 04768001A EP 04768001 A EP04768001 A EP 04768001A EP 1660279 A1 EP1660279 A1 EP 1660279A1
Authority
EP
European Patent Office
Prior art keywords
piston
engagement means
tool
tool according
shank
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.)
Withdrawn
Application number
EP04768001A
Other languages
German (de)
English (en)
Inventor
Darren Leak
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP1660279A1 publication Critical patent/EP1660279A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
    • B25B27/02—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for connecting objects by press fit or detaching same
    • B25B27/023—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for connecting objects by press fit or detaching same using screws

Definitions

  • the present invention relates to a tool for removing a piston from a brake calliper, and in particular for removing a motorcycle brake calliper piston, and a method relating to the same.
  • a known method of removing a piston from a motorcycle brake calliper involves pumping brake fluid through the system until part of the piston is gradually eased out of position in the calliper, and then gripping on to the external wall of the exposed part of the piston with molegrips, and manually pulling it out of the calliper.
  • Problems associated with this method are that it is very time consuming and laborious and, occasionally, a piston seizes so tightly in position in the calliper that it is not practically possible to extract the frozen piston completely by pumping brake fluid against it. Problems occur with calliper design and ultimately all pistons need removing at this stage. This can often result in the piston being damaged due to excessive force being applied thereto.
  • US 4,009,515 discloses a tool for removing a frozen piston from a brake calliper of a car.
  • the tool is unsuitable for removing brake calliper pistons from most vehicles including motorcycles due to its size, and because the tool requires a ⁇ ' -shaped, rigid cross-piece which bears against the car brake calliper itself and against which force is applied for removal of the piston. This often results in the calliper itself being damaged due to excessive force being applied thereto during removal of the piston.
  • this tool can only be used for one size of piston and hence, brake calliper, so it is not very versatile. Finally, the number of parts involved make it complicated and expensive to manufacture.
  • a tool for releasing a piston from a brake calliper comprising a shank having a head member at a first end thereof, a second end of the shank being adapted to be displaced axially in to a body member, and piston engagement means adapted to be placed, in use, around the head member and to abut against the body member, wherein in use, axial displacement of the second end of the shank in to the body member urges the piston engagement means radially outwardly such that it frictionally engages with an inner surface of a piston in a calliper.
  • the body member comprises a channel extending therethrough, preferably along a longitudinal axis thereof.
  • the channel is threaded.
  • the second end of the shank comprises a threaded region, which is adapted to threadedly engage with the channel in the body member.
  • the body member may be integral with the shank.
  • the piston engagement means is adapted to directly abut on to the body member.
  • the piston engagement means is adapted to abut an underside of the body member.
  • axial movement of the second end of the shank in to the body member is adapted to cause axial movement of the head member away from and, preferably out of the piston.
  • abutment of the piston engagement means against the underside of the body member and axial movement of the head member in to the body member results in radial expansion of the engagement means which thereby grips the inside of the piston.
  • the tool comprises means to produce a force, which is directed substantially away from the brake calliper to thereby release the piston engagement means and piston from the brake calliper.
  • the means to produce the force comprises means to provide a jolt or jerk to the head member, preferably, the piston engagement means, and preferably, the piston.
  • the force is directed axially along the shank.
  • the means to produce the force comprises a slide hammer.
  • the means to produce the force comprises an elongate rod, a first end of which preferably extends out of the body member, and a second end of which preferably comprises an end stop.
  • the end stop comprises a nut, which nut is preferably threadedly attached to the second end of the elongate rod.
  • the tool comprises a substantial weight, which is slideably retained on the elongate rod.
  • the weight is adapted to slide up and down the elongate rod.
  • the first end of the elongate rod comprises a threaded region, which is adapted to threadedly engage with the channel in the body member.
  • the second end of the shank is adapted to be axially displaced by hand pressure.
  • hand pressure means that not too much pressure is used so the piston would not be overtightened.
  • a spanner must be used to produce a force using the prior art device.
  • the head member of the tool is frusto-conical in shape, preferably having an upper face and a lower face.
  • the upper face is substantially smaller in section and/or area than the lower face.
  • the width of the head member tapers inwardly as it extends from the lower face to the upper face.
  • the head member is non-circular in section, preferably, substantially oval in section, for example, when viewed from below.
  • the non-circular cross-section of the head member of the present invention helps to prevent locking of the head member against the inner wall of the piston, by reducing the surface area of the head member in contact with the collets, which allows the head member to exert, a much greater force against the collets.
  • the head member is substantially circular in cross-section.
  • the piston engagement means is suitably sized to fit inside a brake calliper piston.
  • the tool comprises a set of differently-sized piston engagement means.
  • this allows the same tool to be used to release different sized pistons, for example, on a motorbike brake calliper.
  • the piston engagement means comprises a collet, which preferably comprises at least one member, and preferably two members or two halves.
  • the piston engagement means may comprise more than two members.
  • a plurality of members may be linked together by linking means, which may be resilient, and which may comprise a spring.
  • the piston engagement means is adapted to fit around the head member, preferably thereby forming a substantially circular outer cross-section.
  • this provides an improved fit between the piston engagement means and the inner surface of the piston itself.
  • the piston engagement means comprises at least one member having at least one cut away section extending along a portion of a longitudinal axis thereof.
  • the piston engagement means comprises a collet having a plurality of cut away sections extending along a portion of its longitudinal axis and preferably, a circumferential ridge toward an upper end thereof.
  • the piston engagement means is formed from a material having elastic properties.
  • the plurality of cut away sections extending along a portion of the longitudinal axis of the piston engagement means allows the piston engagement means to elastically splay radially outward in order to grip the internal wall of a piston.
  • a one piece collet which is easier to use and manufacture, may be used.
  • At least a portion of an exterior surface of the piston engagement means is knurled.
  • substantially all of the exterior surface of the piston engagement means is knurled.
  • a portion of the piston engagement means which, in use, contacts the piston has a knurled surface.
  • the piston engagement means undergoes a hardening procedure during its production.
  • the level of grip between the piston engagement means and the piston is increased by providing a knurled finish to the exterior wall of the piston engagement means.
  • the knurled finish is less likely to wear away over repeated use.
  • the piston engagement means comprises an upper face and a lower face.
  • the piston engagement means, or each member thereof comprises a channel cut out from an inner surface thereof.
  • the channel tapers inwardly as it extends from the lower face to the upper face of the piston engagement means.
  • the angle of taper of the channel in the inner surface of the piston engagement means closely matches the taper of the outer surface of the head member, and vice versa.
  • the piston engagement means is adapted to be arranged around the head member so that the taper of the channel on the inner surface of the piston engagement means is arranged opposite to the taper of the outer surface of the head member.
  • this results in the outer surface of the piston engagement means being circular in outer cross-section and being able to be inserted in to the piston.
  • the angle of taper of the channel in the inner surface of the piston engagement means is slightly less than the angle of taper of the outer surface of the head member.
  • the outer surface of the head member only contacts the inner surface of the piston engagement means over a small portion of its surface area such that a greater local pressure can be applied at the contact point between the head member and the piston engagement means. Consequently, the problems associated with a head member which is circular in cross section may be overcome.
  • the head member comprises alignment means adapted to locate the piston engagement means around the head member.
  • the alignment means comprises a pin, which extends transversely away therefrom.
  • the alignment means is adapted to locate the members around the head member. This is particularly important when the head member is non-circular in cross-section as it would otherwise take time for a mechanic to align the members correctly therearound.
  • the tool may comprise a collar against which the piston engagement means may abut.
  • the collar comprises a channel, which extends therethrough, which channel is .preferably unthreaded.
  • the shaft extends through the channel.
  • the shaft is adapted to freely rotate in the channel.
  • the body member comprises at least one, and preferably two handles, which extends substantially transversely away therefrom.
  • the collar comprises at least one handle extending substantially transversely away therefrom.
  • the handles may be gripped by a user to assist the threading of the shaft in to the body member.
  • piston engagement means have external diameters which are different, and the pistons have internal diameters which are different.
  • a method of removing a piston from a brake calliper comprising inserting the piston engagement means of a tool defined in the first aspect in to a piston such that the engagement means abuts the body member, axially displacing the shank in to the body member of the tool so that the piston engagement means frictionally engages with an inner surface of a piston in a brake calliper, and removing the piston engagement means and piston from the brake calliper.
  • the piston is removed by providing a jolt to the tool, which is preferably caused by a slide hammer.
  • Figure 2 shows a schematic side view of a head section and shank of the tool shown in Figure 1;
  • Figure 3 shows a schematic cross-sectional view of a collar section of the tool
  • Figure 4 shows a schematic cross-sectional side view of a body section of the tool
  • Figure 5 shows a schematic side view of an upper section of the tool
  • Figure 6 shows a schematic end view of the head section of the tool along axis A-A shown in Figure 2;
  • Figure 7 shows a schematic end view of the head section shown in Figure 6 fitted with two halves of a collet, in accordance with the invention
  • Figure 8 shows a schematic perspective view of one half of the collet shown in Figure 7;
  • Figure 9 shows an enlarged side view of the tool in a first configuration with a motorcycle brake piston
  • Figure 10 shows an enlarged side view of the tool in a second configuration with a motorcycle brake piston
  • Figure 11 shows a schematic end view of an alternate embodiment of the head section of the tool
  • Figure 12 shows a schematic end view of the head section shown in figure 11 fitted with an alternative embodiment of a collet
  • Figure 13 shows a cross sectional view through the collet shown in figure 12;
  • Figure 14 shows an enlarged side view of the embodiment of the tool shown in figures 11 to 13 in a first configuration with a motorcycle brake piston
  • Figure 15 shows an enlarged side view of the embodiment of the tool shown in figures 11 to 13 in a second configuration with a motorcycle brake piston.
  • a tool 2 which is used to remove a piston 32 which has seized, frozen or has some how become stuck inside a motorcycle brake calliper (not shown) .
  • the tool 2 consists of an elongate rod 4, a neck section 8 at one end of the elongate rod 4, a body section 12 attached to the neck section 8, and a head section 6 attached to the body section 12.
  • FIG. 5 there is shown the upper section of the tool 2 in greater detail.
  • One end of the elongate rod 4 is threaded so that a top nut 16 can be screwed thereon.
  • the opposite end of the elongate rod 4 is also threaded for engagement with the neck section 8 as will be described hereinafter.
  • a heavy weight 26, having a channel extending therethrough, is slideably mounted on the elongate rod 4. Apart from at each end, the elongate rod 4 is not threaded which allows the weight 26 to slide therealong to act as a slide hammer.
  • the body section 8 of the tool has an inner channel 24, which extends through a central longitudinal axis thereof.
  • the inner surface of the channel 24 is threaded for engagement with the elongate rod 4 and a threaded section 22 of a shank 2a which will be described hereinafter.
  • the neck section 8 has two arms 10, which extend transversely away therefrom, in opposite directions. The arms 10 are provided to allow a mechanic to rotate the body section when in use.
  • the head section 6 of the tool 2 is frusto-conical in shape, having a smaller end and a larger end.
  • a shank 20 extends out of the smaller end of the frustoconical head 6, which shank 20 has a threaded section 22 at the opposite end thereof. The rest of the shank 20 is not threaded.
  • the head section 6 can be seen in cross-section as being oval in shape.
  • the oval has two mutually opposing curved sides and two mutually opposing flatter sides.
  • a small pin 18 extends transversely away from one of the flatter sides of the head section 6.
  • the collar section 12 has an inner channel 25, which extends through a central longitudinal axis thereof. The inner surface of the channel 25 is not threaded.
  • the collar section 12 has an arm 14, which extends transversely away therefrom, and an underside 40 adjacent the head section 6 as indicated in Figure 1.
  • the arm 14 is provided to allow a mechanic to steady the tool 2 when in use.
  • the tool 2 is assembled by inserting the shank 20 of the head section 2 in to, and through, the channel 25 of the collar section 12.
  • the shank 20 is sufficiently long such that the threaded section 22 extends out through the other side of the channel 24 of the collar section 12 and threadedly engages with the threaded channel 24 of the body section 8.
  • the threaded section 22 of the elongate rod 4 threadedly engages with other side of the neck section.
  • the upper section of shank 20 of the head section 6 and the lower section of elongate rod 4 are screwed into either side of the body section 8 with the collar section 12 being free to rotate about the shank 20 due to the unthreaded channel 25.
  • the tool 2 is used as follows with reference to Figures 7, 8, 9 and 10.
  • a mechanic wishing to remove a piston 32 from a motorcycle brake calliper (not shown) first chooses two halves 28a, 28b of a collet 28 which is suitably sized to fit inside the piston 32 to be removed.
  • each half of the collet 28 forms one half of an oval by it's internal surface, and are half of a circle by it's external surface, and has an upper face 34 and a lower face 36.
  • a channel 30 has been cut out of the inside face of each half of the collet 28a, 28b, the channel 30 tapering inwards as it extends from the lower face 36 to the upper face 34.
  • a set of differently sized, but similarly designed, collets are provided with the tool 2, each of which may be used with the tool 2 to remove any size of brake calliper piston 32. For example, for removing a larger piston 32, a larger collet 28 is required which fits therein.
  • each collet half 28a, 28b is correctly arranged with respect to the other half, around the oval shaped head 6.
  • the pin 18 is positioned in between the two halves 28a, 28b of the collet 28 to facilitate quick and correct configuration of the two collet halves 28a, 28b around the head section 6. Without the pin 18, the mechanic would have to spend time having to ensure by eye that they are correctly positioned around the head 6.
  • the upper face 34 of each of the two halves of the collet 28 is placed against the underside 40 of the collar section 12.
  • the mechanic then inserts the frusto-conical head 6 of the tool 2 fitted with the collet 28 arranged therearound into the inside of piston 32 of a motorcycle brake calliper 32. Normally, there is a small gap 42 between the outer curved surface of the collet 28 and the inner wall of the piston 32 as shown in Figure 9.
  • the mechanic While holding the arm 14 of the collar section 12 steady, the mechanic then rotates the body section 8 of the tool 2 using arms 10, such that the head section 6 is further threaded in to neck section 8.
  • the shank 20 of the head section 6 is drawn upwards towards the collar section 12 in a direction as indicated by arrow Z' in Figure 9.
  • the gap 40 shown in Figure 9 gradually closes as the head section 6 nears the underside 40 of the collar section 12.
  • the frusto-conical shape of the head section 6 ensures that, as the head section 6 is screwed further up into the body section 8, both halves of the collet 28a, 28b are forced radially outwardly in a direction as indicated by arrows ⁇ Y' as shown in Figure
  • the mechanic then causes it to be jolted out of the brake calliper, by either pulling the tool 2 away from the calliper, or by using the heavy weight 26.
  • the mechanic urges the heavy weight 26 to slide along elongate rod 4 such that it slams against the top 16 thereby causing a jolt, which lifts the frozen piston 32 out of the calliper .
  • FIGs 11, 12, 13, 14 and 15 show an alternate embodiment of the head section and collet. Like reference numerals have been used to those in figures 1 to 10 where the parts are the same .
  • the head section 106 can be seen in cross section as being circular in shape. Unlike the previous embodiment, the head section 106 does not have a small pin extending transversely away therefrom.
  • Figure 12 shows a cross section of the head section 106 around which is fitted a collet 128.
  • the collet 128 is a single piece, unlike the previous embodiment, and has four apertures 129 extending partially along its length.
  • a cross section through the collet 128 is shown in figure 13 having an upper face 134, a lower face 136 and one of the four apertures 129.
  • the collet 128 has a circumferential groove 131 around its perimeter toward the upper face 134 thereof.
  • the circumferential groove 131 in combination with the apertures 129 allow the walls of the collet 128 to flare out at the bottom when an internal radial pressure is applied by the axial displacement of the head section 106.
  • the internal surface of the collet 128 is tapered toward the upper face 134 thereof.
  • the head section 106 is also tapered so as to fit inside the collet 128.
  • the angle of taper of the head section 106 is slightly greater than that of the internal surface of the collet 128. This means that the head section 106 only contacts the internal surface of the collet 128 at a lower end of the head section 106. This results in the advantage that the head section 106, when displaced axially with respect to the collet 128 (ie. is drawn up through the collet 128), only applies pressure toward the lower face 136 of the collet 128 thereby forcing the collet 128 to flare outward toward a lower face thereof.
  • a further advantage is that the contact area between the head section 106 and the interior surface of the collet 128 is small. This decrease in area leads to an increase in pressure between the two faces meaning that the head section 106 is less likely to slip and rotate when engaged with the internal surface of the collet 128.
  • FIG. 14 shows the tool 2 having head section 106 and collet 128 inside a cross section of a motorcycle brake piston 32.
  • Figure 14 shows the tool 2 prior to engagement with the interior wall of the piston 32.
  • the head section 106 is displaced axially with regard to the collet 128 (by screwing the neck section 8 on to the threaded section 22 of the elongate rod 4) .
  • the aperture 129 can open elastically and the circumferential groove 131 can similarly close elastically to allow the collet 128 to flare radially outwardly.
  • the piston 32 When the collet 128 is engaged with the piston 32, the piston 32 may be removed from the brake calliper is described above in relation to the first embodiment.
  • the tool 2 is provided with a range of collets 28 of different sizes and diameters such that the tool 2 can be used to remove motorcycle brake calliper pistons having different diameters, for example, for different manufacturer's type, size of motorcycle.
  • the cross-sectional shape of the head section 6 is oval as opposed to circular, which prevents each half of the collet 28a, 28b from sticking thereto or themselves locking up as the body section 8 is rotated to further thread the shank 20 therein.
  • the oval head section is able to slide within the collets 28 thereby pushing the collets 28 outwardly against the inner wall of the piston 32.
  • the pin 18 extending out of the head section 6 facilitates and ensures that the two halves of the collet 28a, 28b are always correctly aligned on the oval head section 6, thereby forming a substantially circular profile which fits inside the piston 32.
  • the tool 2 is very simple to use and manufacture consisting of very few parts.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Braking Arrangements (AREA)

Abstract

L'invention concerne un outil (2) permettant de retirer un piston (32) d'un étrier de frein. Cet outil (2) comprend une barre (20) comportant, à une première extrémité, une tête (6), la seconde extrémité de la barre (20) étant conçue pour se déplacer de façon axiale dans une structure (12). Cet outil comprend également un élément de retrait de piston (28) conçu pour être placé, lors de l'utilisation de l'outil, autour de la tête (6), contre la structure (12). Lorsque la seconde extrémité de la barre (20) est déplacée de façon axiale dans la structure (12), l'élément de retrait de piston (28) est écarté de façon radiale vers l'extérieur et entre en prise avec une surface interne d'un piston (32) dans un étrier.
EP04768001A 2003-08-06 2004-08-06 Outil destine au retrait d'un piston d'etrier de frein Withdrawn EP1660279A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0318395A GB0318395D0 (en) 2003-08-06 2003-08-06 Brake calliper piston removal tool
PCT/GB2004/003413 WO2005014235A1 (fr) 2003-08-06 2004-08-06 Outil destine au retrait d'un piston d'etrier de frein

Publications (1)

Publication Number Publication Date
EP1660279A1 true EP1660279A1 (fr) 2006-05-31

Family

ID=27839712

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04768001A Withdrawn EP1660279A1 (fr) 2003-08-06 2004-08-06 Outil destine au retrait d'un piston d'etrier de frein

Country Status (3)

Country Link
EP (1) EP1660279A1 (fr)
GB (1) GB0318395D0 (fr)
WO (1) WO2005014235A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202008018163U1 (de) * 2007-11-29 2011-11-14 Rainer July Werkzeug zum Ausheben von Stiften
CN110026944B (zh) * 2019-05-21 2023-12-19 王庆荣 一种与车辆刹车分泵回位工具配套的专用圆球形旋转卡头
US11512749B1 (en) 2020-03-10 2022-11-29 Bruce Lewis Brake piston-pushing tool

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1476983A (en) * 1923-12-11 Apparatus pob cutting pipes
US3055093A (en) * 1958-05-21 1962-09-25 Bendix Corp Sleeve puller
US3108365A (en) * 1960-07-18 1963-10-29 Arthur A Dankerley Tool for inserting bearing inserts
US4009515A (en) * 1974-12-09 1977-03-01 Charles Racin Disc brake piston puller
US4852235A (en) * 1988-08-19 1989-08-01 Trease Dwaine A Bearing puller

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2005014235A1 *

Also Published As

Publication number Publication date
WO2005014235A1 (fr) 2005-02-17
GB0318395D0 (en) 2003-09-10

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