CA1187424A - Piston for disc brakes - Google Patents
Piston for disc brakesInfo
- Publication number
- CA1187424A CA1187424A CA000386688A CA386688A CA1187424A CA 1187424 A CA1187424 A CA 1187424A CA 000386688 A CA000386688 A CA 000386688A CA 386688 A CA386688 A CA 386688A CA 1187424 A CA1187424 A CA 1187424A
- Authority
- CA
- Canada
- Prior art keywords
- piston
- wall
- cap
- open end
- metallic cap
- 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.)
- Expired
Links
- 239000011324 bead Substances 0.000 claims abstract description 36
- 239000000428 dust Substances 0.000 claims abstract description 34
- 238000004873 anchoring Methods 0.000 claims abstract description 4
- 239000002131 composite material Substances 0.000 claims description 3
- 239000011347 resin Substances 0.000 claims 5
- 229920005989 resin Polymers 0.000 claims 5
- 239000004033 plastic Substances 0.000 abstract description 23
- 238000000465 moulding Methods 0.000 abstract description 6
- 238000002788 crimping Methods 0.000 abstract description 2
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 230000000875 corresponding effect Effects 0.000 description 3
- 101150007144 Intu gene Proteins 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- FGRBYDKOBBBPOI-UHFFFAOYSA-N 10,10-dioxo-2-[4-(N-phenylanilino)phenyl]thioxanthen-9-one Chemical compound O=C1c2ccccc2S(=O)(=O)c2ccc(cc12)-c1ccc(cc1)N(c1ccccc1)c1ccccc1 FGRBYDKOBBBPOI-UHFFFAOYSA-N 0.000 description 1
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 1
- 229920000459 Nitrile rubber Polymers 0.000 description 1
- 102000012152 Securin Human genes 0.000 description 1
- 108010061477 Securin Proteins 0.000 description 1
- 101150030413 Timp gene Proteins 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000010073 coating (rubber) Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- KVFIJIWMDBAGDP-UHFFFAOYSA-N ethylpyrazine Chemical compound CCC1=CN=CC=N1 KVFIJIWMDBAGDP-UHFFFAOYSA-N 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920001568 phenolic resin Polymers 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 230000002633 protecting effect Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D65/00—Parts or details
- F16D65/14—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D65/00—Parts or details
- F16D65/78—Features relating to cooling
- F16D2065/785—Heat insulation or reflection
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2125/00—Components of actuators
- F16D2125/02—Fluid-pressure mechanisms
- F16D2125/06—Pistons
Abstract
IMPROVED PISTON FOR DISC BRAKES
ABSTRACT
An improved disc brake plastic piston is described which has a metallic cap or face which provides a means of attaching a brake shoe or a brake shoe assembly, or provides a dust boot groove, or, in a most preferred mode, the metallic cap component provides both a brake shoe retaining means and a dust boot groove.
The piston is comprised of a cylindrical plastic body having an open end and a closed end. At least one ring bead can extend from the wall of the piston body contiguous to, or near, the open end.
The bead or beads are suitably ejector beads utilized in the molding operation. A metallic cap extends over the end wall of the open end of the cylindrical body and is secured to the body by being snap fit or clamped over the ring bead. The cap is adapted to receive and hold a brake shoe clip, or provide a dust boot groove, and, in a most preferred embodiment, provides both a brake shoe retaining means and a dust boot groove.
Alternative means for anchoring the metallic cap are provided, such as by crimping the interior lip of the metallic cap or by pro-viding threads on the internal or external walls of the piston adja-cent to the open end of the piston, and corresponding or matching threads on the metallic cap.
ABSTRACT
An improved disc brake plastic piston is described which has a metallic cap or face which provides a means of attaching a brake shoe or a brake shoe assembly, or provides a dust boot groove, or, in a most preferred mode, the metallic cap component provides both a brake shoe retaining means and a dust boot groove.
The piston is comprised of a cylindrical plastic body having an open end and a closed end. At least one ring bead can extend from the wall of the piston body contiguous to, or near, the open end.
The bead or beads are suitably ejector beads utilized in the molding operation. A metallic cap extends over the end wall of the open end of the cylindrical body and is secured to the body by being snap fit or clamped over the ring bead. The cap is adapted to receive and hold a brake shoe clip, or provide a dust boot groove, and, in a most preferred embodiment, provides both a brake shoe retaining means and a dust boot groove.
Alternative means for anchoring the metallic cap are provided, such as by crimping the interior lip of the metallic cap or by pro-viding threads on the internal or external walls of the piston adja-cent to the open end of the piston, and corresponding or matching threads on the metallic cap.
Description
I ROVED PlS~ON FOR DISC BRAKES
BACKGROUi~D OF THE INVENTION
The present invention relates to an improvecl piston for disc brakes such as vehicular dise brakes. More in particular the present invention relates to an improved plastic brake piston hav-ing a Inetallic cap positioned on the face of the piston which is adapted to er)gage the brake shoe or brake shoe attaching means such as a clip. Tile cap provides a proteclive cover for the plas-tic piston face nearest the braking means and also provides a means for retaining the brake shoe or brake shoe clip and may also pro-vide a means for retaining a dus-t boot. Also the metallic cap can provide a means for shielding the dust boot from the adverse af-fects of heat.
Al-though the present invention will be describcd in terms of disc brakes~ particularly intended for nlotor vehicles it will be understood that the present ilnprovecl piston is equally adaptable to piston brakes utilized on railroad vehicles and indllstr;al ap-pllcations sucll as engines.
One type of brake assembly presently in use in nlotor vehicle disc bra~es is the opposed piston type. In such -type a piston is positiorled adjacent each opposi-te side of a brake disc and forces its respective brake shoe or lining against the disc to impart a braking ac~:ion. Other types of brake assenlblies to which the prc-sent invention is equally useflll are those in which a single pis-ton is utilizecl to move the brake shoe or linin~ in-to contact with both sides of the brake disc by utilizing a caliper slide to jM-part a bra~ing action.
Upon the advellt of the use of disc brakes in nnotor vehicles the pistons used l~ere metallic~ usually fabricated of chrollle p~ated steel ancl required several timP consulning and costly macllining ~.
~37~
~- 2 -operations~bre reeently, pistons for disc brakes have been fabricated of a plastic material, usually a phenolic resin molding ccmpound. Such pistons may be produced by molding technic~es kx~ in the art. Typical plastic pistons are descriked in U.S. Patent 4,170,926. Plastic pistons can be molded wi~h at least one ring bead on the force portion of the mold tD create an under-cut to assist in withdrawing the piston from the mold when the mold is opened. Up to the present time, such ejector beads have been positioned on 10 the piston to be inconspicuous and non~interfering with the piston operation. It has nww been four~ that the ejec~or . t bead may be utilized to provi~e an improved brake piston.
More recent designs of plastic pistons embody a hollowed cylinder having an internal groove for re- -taining a brake shoe clip. The groove, by necessity, has to be formed after the molding operation and requires a maching step. Such pistons may also require a groove, typi.cally on the outside wall, to retain a dust boot or cover. The forming of a dust 20 boot groove in the piston also requires rnachining after molding, which, in turn, adds a further machining step. It has now been found that the ejector bead or beads previously thought a useless necessity can be utilized to eliminate one or more machining steps. In situations wherein the ejector bead is not used or desired, alternative anchoring means can be provided.
In..accordance with the invention .there is provi.dec.
a co~osite vehicular brake piston comprised of a cylindrical rèsin body having an open end and a closed end and a metallic cap extending over the end wall of.said open end and secured to said body by an anchor-- 2a -ing means, wherein said body has a narrowed portion in the outer wall thereof contiguous to said open end, the end of said çap and the portion of said body adjacent said narrowed portion providing a groove adapted to receive a dust boot.
In a particular embodiment a bead is positioned on the outer wall in the narrowed portion.
The improved disc brake plastic piston of the pre-sent invention has a metallic cap or face which pro-vides a means of attaching a brake shoe or a brakeshoe assembly, or provides a dust boot groove, or, in a most preferred mode, the metallic çap component provides both a brake shoe retaining means and a dust ~7'7~
boot groove. Any of the metallic caps of the invention can be pro-vided with means for shieldiny the dust boot from heatO
The present piston is comprised of a cylindrical plas-tic body having an open end and a closed end. The "closed end" can be cored out for structural and other purposes and is cdee~ed to be within the fore~oing description. In one embodirllent at least one ring bead ex-tends from the wall of the pis-ton body contiguous to, or near, the open end. The bead or beacls are suitably ejector beacls utilized at the end of the molding operation to remove the part from the mold.
A metallic cap extends over the end wall oF the open encd of the cy-lindrical body and is secured to the body by being snap fit or clampecl over the ring bead. The cap is aclapted to receive and hold a brake shoe clip, or provicle a dust boot groove, and, in a most preferred em-bocliment, provides both a brake shoe retaininy means ancl a dust boot groove.
~ hile the invention has been described with respect to use of the ring beads on the external ancl internal walls of the piston, other em-bodimellts omit the use of such rin~g be,ids. Alternative rneans for an-chorirl(J or attaching the metallic cap to the piston where no ring beads are proviclecl at the point Or attachlnent, include mocdifying the normally recJular ecl~e surface of the intcrior. Such moclifications include crimp-ing, notching or lanclng the metallic edge in one or more places, ~r serrating all or portions of the metallic edge. Another alternat-ive involves the use of threads rnolded into the ins;de wall or the outside ~5 wall of the piston adjacent the open end of the piston~ and correspond-ing threads formed in the metallic cap.
All of the foregoing embodinlents of the invention can be further lnoclified to provicle a metallic extension which serves as a heat shield for the dust boo-t. In normal practice, dust boots are subject to heat generated during operation of the disc brakes. Orclinarily, there is no mearls for pro-tecting the dust boot and deterioration occurs. The metallic cap provides a way to provide a heat shield. The metallic cap is extended outwardly over the dust boot to shielcl the boot froln the ~dverse affects of heat. The hea-t shielcl can take various physical forms as will be illustrated hereinafter.
The metallic cap can be coated Witil a plastic or other surface to provide a barrier to heat and souncl. Such a coating is particu-larly advantageous on the surface which contacts or faces the disc backing plate. A suitable coating for this purpose is a Buna-N
rubber coating.
The present composite piston elirlinates machinin~ to form a groove in the piston to provide a means of retaining the brake shoe or the dust boot. Accordin~ly, tlle present piston can be fabl^icated ~ith a thinner wall section than the plastic pistons of the prior art. In addition, the present composite p-iston pro-vides a souncl barrier 'layer enabling a quie~er operation o-f the vehicle brakes. The metal Face also reduces scuffing o-F the sur-face against the brake shoe backin~ plate, and dls-tortion of the piston due to high compressive loacl at elevated teMpera-ture. The metal face provides an improved r~eans Or dissipating heat. The ~O Inetal'lic cap further protects the ed~es of the piston against chip ping al~c! othel^ c!arilagc, ancl provides a prying surFace to he utilized durin~ brake repai~.
BRIEF DESCRIPTION OF THE DRAWINGS
__ _ _ _ Figures 1 throu~h 11 are elevational views of the present cor,1posite piston, partly in section, to illustrate various pre-ferred embodimellts of the invention.
_EST MODES FOR CARRYING OUT THE INVENTION
Looking now at Figure 1, cylindrical piston 11 has a closed end 13 and an open end 15. Ring bead 17 extends from the internal wall of piston 11. Metallic cap 19, preferably of steel, extends over and covcrs ~nd ~d~ or open end 15 of piston 11 and is secured on pistnn 11 i)y being snap fit or clamped over beacl 17 along shapecl portic3n 21. Cap 19 is ddapted to receivc a typical brdke siloc c1ip nut silo~n by receiving the t)rakc si~oe clip ther(?in and sccuring the brakc shoe clip by being snap fit. In this embocli-ment a grr)ovc ?3 ~Jould be r~quired to be machined to provide a means of rcLaining a dllst boot.
Figllrc 2 illustrates an embodilllent of thc invcntion ~Iherein piston 11 has a narro~1 portioll 25 contiguous to open cnd lS. A
ring becld 27 is positioned in or alony narrowrd porlion 25. Metal-lic cap 19 in tllis embo(limcnt extends over and covers end ~a11 14 o~ piston 11 and is snap fit or clam;1ed over bead 27 along silaped portit)n 29 all~l provides groove 31 adap-tecl to receive and ho1cl a ty;)ical dllst hoot no-t silorYn. In this ei~b(~ lerll~ groove 33 mcly be requirecd to be macilined to provide a Ineans of retainincJ a brake sho~ c1ip.
Lookit?g now at Fig~lre 3 the most preferrccl eml)odilncn-t piston 11 has a narrol~ecl pc)rtiol1 25 al1d interlla1 r-il1g beacl 17 and externa1 ..... _ _ ring bcld ~7. ~lctallic cap 19 exterlds ovc?r and covers el1cl~al1 14 oi` ol)erl ell(l 15 and is snap fit or clanlpe(l over both beacl 17 and bead 27. ~s shown ;n .~igure 3 tlYO ring ~ea~s 17 and 27 are ti1ized; ho~ever it l/il1 be understood that single bead eitl~er interna1 or external may be useci to secure the cap melnber 13 to the piston melnber 11. Cap 19 provicles a means of retairliny a typ-ical brake shoe c1ip enteril1g open end _5 and also provides a yroove31 for ~eta-inill~ a typical dust boot.
In tile elnboclilllent sho~l1 in Figllre 4 cylindrica1 piston 11 has a closed o~ld 13 and an open end 15. Metal1ic cap 19 preferably of stee1 extei-cls over and covers end ~all 14 ol open end 15 of piston 11 and is secured on piston 11 by one or lllor? crillll)s 34 aiong silapecl portion 2l. The crimps embfd into the insicle wall 3~ of the piston to hold mctallic cap l9 in place on piston ll. Cap 19 is adapted to receivf a typical brake shoe clip not shown by receiving the brake shoe clip therein and secllring the brake shoe cli~ y heing snap lit. In this e111bodin)e1lt~ a groove 23 woul~1 be required lo be rnachined to pro\~ide a means of retaining a dust boot.
Ficgure 5 illustratcs an embodiment whertin piston ll has a narrowet1 pt)rtion 25. Me-t;allic cap 19 extencis over ancl covers end ~ oF open end 15 and is secured on piston ll by one or rnore cri111ps 3~ along shaped portion 21. The crimps emt)ed into the in-sicle wall 35 of tht piston to hold metallic cap 19 in place on pis-ton ll_. ~s sho~n in 1:igure 5 no ring beacls are util;zec1; hoi/ever$
i-t will bt u1lderstood that an exl:ernal beac1 can be used to further secure the cap 1llelnbcr 19 to the 1)-iston 1ne1nber ll. Cap 19 provicles ~1 means Or retainincJ a typical 1)rake shoe clip enteri1lg open end 15 ancl a1so by melns of shdped portion 29 provides a tgroove 31 i-or retaining a typical dust boot.
In t:he enlboc1i1ll(nl; shc)w1l in Figure G piston ll nas a narrowed portion 25 and the inside wall is prov-icled wit;h ramp 35 such l:hat thc d~ eler o~ the inside~\Yall 34 is narrower near close(l end 13 t11in ~rt tht? er1d wall 1~. Metc~l1ic cap 19 exte1lds over and covers end ~a1l 1~i of ope1l end 15 anci is secure~l on piston ll by one or more notciles 37 alon~1 shaped porl:ion 21. The notches eillbed into the insicle wall 35 o-f the piston to holcl meta1lic cap 19 in place on piston ll. As shown in Figure 6 no ring beads are u-t;ilized;
however it will be linderstooc1 thlt an external bead can be used to secure rti1e cap n1e1mber 19 to the piston me1nber ll. oap 19 pro-vides a nleans of retaining a ~ypical bra~e sl-1oe clip en-terincJ o1)en end 15 an(1 also by means o-F shaped portion 29 provides a yroove 3l for retai1ling a typical dust bnot.
In the embodill\ent sho~n in Figure 7 cylindrical piston 11 has a clused end 13 an operl encl 15 and a narrowed portion 25, contitJ-uous ~iih open encl 1~. Metallic cap 19 ~referal)ly of steel ~ex-tends over and covers enrd wall 14 of open end 15 of piston 11 and is secllrecl on piston 11 by serrations 40 along shaped portion 21.
The serrat-ions elllbed into the insitle wall 35 to hold cap 19 in place on piston 11. Cap 19 is ddapted to receive a typical brake sh()e clip n()t sh()~ by receiv-inJ the brale shoe clip therein and securillg the brake sl~oe clip by beiny snap fit. In this e~l~odimc!llt a heal shield 33 is provided by extenclirlg -the metallic cap 19 out-wardly From end wall 14 such that the heat shield partially covers a typical dust boGt (not shoiln). Aclclitionally element 39 is formed and pressed intu eclge 42 of cap 19 to provide groove 31 ~hich is aclallt(d (;o rece~ivL ancl holcl the typical clust boot. Alternatively elenlellt 39 carl be welded to cap l9.
. _ Figure ~ illustrates an en;bo(lilllent oF tlle inventiorl l~herein pistnn 11 has a narro~Y portion ?5 contigll()us to upen end 15. A
ring beacl 27 is positioned in or alon~ narrowed por-tion 25. Metal-lic cap l9 in this eml)oclil-llent extends over and covers end wall 14
BACKGROUi~D OF THE INVENTION
The present invention relates to an improvecl piston for disc brakes such as vehicular dise brakes. More in particular the present invention relates to an improved plastic brake piston hav-ing a Inetallic cap positioned on the face of the piston which is adapted to er)gage the brake shoe or brake shoe attaching means such as a clip. Tile cap provides a proteclive cover for the plas-tic piston face nearest the braking means and also provides a means for retaining the brake shoe or brake shoe clip and may also pro-vide a means for retaining a dus-t boot. Also the metallic cap can provide a means for shielding the dust boot from the adverse af-fects of heat.
Al-though the present invention will be describcd in terms of disc brakes~ particularly intended for nlotor vehicles it will be understood that the present ilnprovecl piston is equally adaptable to piston brakes utilized on railroad vehicles and indllstr;al ap-pllcations sucll as engines.
One type of brake assembly presently in use in nlotor vehicle disc bra~es is the opposed piston type. In such -type a piston is positiorled adjacent each opposi-te side of a brake disc and forces its respective brake shoe or lining against the disc to impart a braking ac~:ion. Other types of brake assenlblies to which the prc-sent invention is equally useflll are those in which a single pis-ton is utilizecl to move the brake shoe or linin~ in-to contact with both sides of the brake disc by utilizing a caliper slide to jM-part a bra~ing action.
Upon the advellt of the use of disc brakes in nnotor vehicles the pistons used l~ere metallic~ usually fabricated of chrollle p~ated steel ancl required several timP consulning and costly macllining ~.
~37~
~- 2 -operations~bre reeently, pistons for disc brakes have been fabricated of a plastic material, usually a phenolic resin molding ccmpound. Such pistons may be produced by molding technic~es kx~ in the art. Typical plastic pistons are descriked in U.S. Patent 4,170,926. Plastic pistons can be molded wi~h at least one ring bead on the force portion of the mold tD create an under-cut to assist in withdrawing the piston from the mold when the mold is opened. Up to the present time, such ejector beads have been positioned on 10 the piston to be inconspicuous and non~interfering with the piston operation. It has nww been four~ that the ejec~or . t bead may be utilized to provi~e an improved brake piston.
More recent designs of plastic pistons embody a hollowed cylinder having an internal groove for re- -taining a brake shoe clip. The groove, by necessity, has to be formed after the molding operation and requires a maching step. Such pistons may also require a groove, typi.cally on the outside wall, to retain a dust boot or cover. The forming of a dust 20 boot groove in the piston also requires rnachining after molding, which, in turn, adds a further machining step. It has now been found that the ejector bead or beads previously thought a useless necessity can be utilized to eliminate one or more machining steps. In situations wherein the ejector bead is not used or desired, alternative anchoring means can be provided.
In..accordance with the invention .there is provi.dec.
a co~osite vehicular brake piston comprised of a cylindrical rèsin body having an open end and a closed end and a metallic cap extending over the end wall of.said open end and secured to said body by an anchor-- 2a -ing means, wherein said body has a narrowed portion in the outer wall thereof contiguous to said open end, the end of said çap and the portion of said body adjacent said narrowed portion providing a groove adapted to receive a dust boot.
In a particular embodiment a bead is positioned on the outer wall in the narrowed portion.
The improved disc brake plastic piston of the pre-sent invention has a metallic cap or face which pro-vides a means of attaching a brake shoe or a brakeshoe assembly, or provides a dust boot groove, or, in a most preferred mode, the metallic çap component provides both a brake shoe retaining means and a dust ~7'7~
boot groove. Any of the metallic caps of the invention can be pro-vided with means for shieldiny the dust boot from heatO
The present piston is comprised of a cylindrical plas-tic body having an open end and a closed end. The "closed end" can be cored out for structural and other purposes and is cdee~ed to be within the fore~oing description. In one embodirllent at least one ring bead ex-tends from the wall of the pis-ton body contiguous to, or near, the open end. The bead or beacls are suitably ejector beacls utilized at the end of the molding operation to remove the part from the mold.
A metallic cap extends over the end wall oF the open encd of the cy-lindrical body and is secured to the body by being snap fit or clampecl over the ring bead. The cap is aclapted to receive and hold a brake shoe clip, or provicle a dust boot groove, and, in a most preferred em-bocliment, provides both a brake shoe retaininy means ancl a dust boot groove.
~ hile the invention has been described with respect to use of the ring beads on the external ancl internal walls of the piston, other em-bodimellts omit the use of such rin~g be,ids. Alternative rneans for an-chorirl(J or attaching the metallic cap to the piston where no ring beads are proviclecl at the point Or attachlnent, include mocdifying the normally recJular ecl~e surface of the intcrior. Such moclifications include crimp-ing, notching or lanclng the metallic edge in one or more places, ~r serrating all or portions of the metallic edge. Another alternat-ive involves the use of threads rnolded into the ins;de wall or the outside ~5 wall of the piston adjacent the open end of the piston~ and correspond-ing threads formed in the metallic cap.
All of the foregoing embodinlents of the invention can be further lnoclified to provicle a metallic extension which serves as a heat shield for the dust boo-t. In normal practice, dust boots are subject to heat generated during operation of the disc brakes. Orclinarily, there is no mearls for pro-tecting the dust boot and deterioration occurs. The metallic cap provides a way to provide a heat shield. The metallic cap is extended outwardly over the dust boot to shielcl the boot froln the ~dverse affects of heat. The hea-t shielcl can take various physical forms as will be illustrated hereinafter.
The metallic cap can be coated Witil a plastic or other surface to provide a barrier to heat and souncl. Such a coating is particu-larly advantageous on the surface which contacts or faces the disc backing plate. A suitable coating for this purpose is a Buna-N
rubber coating.
The present composite piston elirlinates machinin~ to form a groove in the piston to provide a means of retaining the brake shoe or the dust boot. Accordin~ly, tlle present piston can be fabl^icated ~ith a thinner wall section than the plastic pistons of the prior art. In addition, the present composite p-iston pro-vides a souncl barrier 'layer enabling a quie~er operation o-f the vehicle brakes. The metal Face also reduces scuffing o-F the sur-face against the brake shoe backin~ plate, and dls-tortion of the piston due to high compressive loacl at elevated teMpera-ture. The metal face provides an improved r~eans Or dissipating heat. The ~O Inetal'lic cap further protects the ed~es of the piston against chip ping al~c! othel^ c!arilagc, ancl provides a prying surFace to he utilized durin~ brake repai~.
BRIEF DESCRIPTION OF THE DRAWINGS
__ _ _ _ Figures 1 throu~h 11 are elevational views of the present cor,1posite piston, partly in section, to illustrate various pre-ferred embodimellts of the invention.
_EST MODES FOR CARRYING OUT THE INVENTION
Looking now at Figure 1, cylindrical piston 11 has a closed end 13 and an open end 15. Ring bead 17 extends from the internal wall of piston 11. Metallic cap 19, preferably of steel, extends over and covcrs ~nd ~d~ or open end 15 of piston 11 and is secured on pistnn 11 i)y being snap fit or clamped over beacl 17 along shapecl portic3n 21. Cap 19 is ddapted to receivc a typical brdke siloc c1ip nut silo~n by receiving the t)rakc si~oe clip ther(?in and sccuring the brakc shoe clip by being snap fit. In this embocli-ment a grr)ovc ?3 ~Jould be r~quired to be machined to provide a means of rcLaining a dllst boot.
Figllrc 2 illustrates an embodilllent of thc invcntion ~Iherein piston 11 has a narro~1 portioll 25 contiguous to open cnd lS. A
ring becld 27 is positioned in or alony narrowrd porlion 25. Metal-lic cap 19 in tllis embo(limcnt extends over and covers end ~a11 14 o~ piston 11 and is snap fit or clam;1ed over bead 27 along silaped portit)n 29 all~l provides groove 31 adap-tecl to receive and ho1cl a ty;)ical dllst hoot no-t silorYn. In this ei~b(~ lerll~ groove 33 mcly be requirecd to be macilined to provide a Ineans of retainincJ a brake sho~ c1ip.
Lookit?g now at Fig~lre 3 the most preferrccl eml)odilncn-t piston 11 has a narrol~ecl pc)rtiol1 25 al1d interlla1 r-il1g beacl 17 and externa1 ..... _ _ ring bcld ~7. ~lctallic cap 19 exterlds ovc?r and covers el1cl~al1 14 oi` ol)erl ell(l 15 and is snap fit or clanlpe(l over both beacl 17 and bead 27. ~s shown ;n .~igure 3 tlYO ring ~ea~s 17 and 27 are ti1ized; ho~ever it l/il1 be understood that single bead eitl~er interna1 or external may be useci to secure the cap melnber 13 to the piston melnber 11. Cap 19 provicles a means of retairliny a typ-ical brake shoe c1ip enteril1g open end _5 and also provides a yroove31 for ~eta-inill~ a typical dust boot.
In tile elnboclilllent sho~l1 in Figllre 4 cylindrica1 piston 11 has a closed o~ld 13 and an open end 15. Metal1ic cap 19 preferably of stee1 extei-cls over and covers end ~all 14 ol open end 15 of piston 11 and is secured on piston 11 by one or lllor? crillll)s 34 aiong silapecl portion 2l. The crimps embfd into the insicle wall 3~ of the piston to hold mctallic cap l9 in place on piston ll. Cap 19 is adapted to receivf a typical brake shoe clip not shown by receiving the brake shoe clip therein and secllring the brake shoe cli~ y heing snap lit. In this e111bodin)e1lt~ a groove 23 woul~1 be required lo be rnachined to pro\~ide a means of retaining a dust boot.
Ficgure 5 illustratcs an embodiment whertin piston ll has a narrowet1 pt)rtion 25. Me-t;allic cap 19 extencis over ancl covers end ~ oF open end 15 and is secured on piston ll by one or rnore cri111ps 3~ along shaped portion 21. The crimps emt)ed into the in-sicle wall 35 of tht piston to hold metallic cap 19 in place on pis-ton ll_. ~s sho~n in 1:igure 5 no ring beacls are util;zec1; hoi/ever$
i-t will bt u1lderstood that an exl:ernal beac1 can be used to further secure the cap 1llelnbcr 19 to the 1)-iston 1ne1nber ll. Cap 19 provicles ~1 means Or retainincJ a typical 1)rake shoe clip enteri1lg open end 15 ancl a1so by melns of shdped portion 29 provides a tgroove 31 i-or retaining a typical dust boot.
In t:he enlboc1i1ll(nl; shc)w1l in Figure G piston ll nas a narrowed portion 25 and the inside wall is prov-icled wit;h ramp 35 such l:hat thc d~ eler o~ the inside~\Yall 34 is narrower near close(l end 13 t11in ~rt tht? er1d wall 1~. Metc~l1ic cap 19 exte1lds over and covers end ~a1l 1~i of ope1l end 15 anci is secure~l on piston ll by one or more notciles 37 alon~1 shaped porl:ion 21. The notches eillbed into the insicle wall 35 o-f the piston to holcl meta1lic cap 19 in place on piston ll. As shown in Figure 6 no ring beads are u-t;ilized;
however it will be linderstooc1 thlt an external bead can be used to secure rti1e cap n1e1mber 19 to the piston me1nber ll. oap 19 pro-vides a nleans of retaining a ~ypical bra~e sl-1oe clip en-terincJ o1)en end 15 an(1 also by means o-F shaped portion 29 provides a yroove 3l for retai1ling a typical dust bnot.
In the embodill\ent sho~n in Figure 7 cylindrical piston 11 has a clused end 13 an operl encl 15 and a narrowed portion 25, contitJ-uous ~iih open encl 1~. Metallic cap 19 ~referal)ly of steel ~ex-tends over and covers enrd wall 14 of open end 15 of piston 11 and is secllrecl on piston 11 by serrations 40 along shaped portion 21.
The serrat-ions elllbed into the insitle wall 35 to hold cap 19 in place on piston 11. Cap 19 is ddapted to receive a typical brake sh()e clip n()t sh()~ by receiv-inJ the brale shoe clip therein and securillg the brake sl~oe clip by beiny snap fit. In this e~l~odimc!llt a heal shield 33 is provided by extenclirlg -the metallic cap 19 out-wardly From end wall 14 such that the heat shield partially covers a typical dust boGt (not shoiln). Aclclitionally element 39 is formed and pressed intu eclge 42 of cap 19 to provide groove 31 ~hich is aclallt(d (;o rece~ivL ancl holcl the typical clust boot. Alternatively elenlellt 39 carl be welded to cap l9.
. _ Figure ~ illustrates an en;bo(lilllent oF tlle inventiorl l~herein pistnn 11 has a narro~Y portion ?5 contigll()us to upen end 15. A
ring beacl 27 is positioned in or alon~ narrowed por-tion 25. Metal-lic cap l9 in this eml)oclil-llent extends over and covers end wall 14
2() o~ piXtOIl 11 an(l extellds out~arclly Fronl elld wall !4 tn form lleaL
slrielcl 41 ~hicll partially covers a typical dust boot (not sho~
_ ~leat shield elenlent 43 provides furtller heat protection to the dust boot. In additiorl to this elemeni 45 is fornled ancl l)resse~
into cap 19 and is snap fit or clan~ped over beacl 27 ~o provide 2~ ~roove 31 adal)ted to receive and llold the typical dust boot. In this elnbodilnent ~roove 33 may be required to be rnacl~ined to pro-vide a n~ealls of retainin(J a brake shoe clip.
In Ficgllre ~ piston 11 ilas a narro~!ed porti()ll 25 and external rillg bead 27. t~letallic cap 1~ extends ()ver and COVt'rS end ~lall 1 3n of open end 15 and is secured to piston 11 by bein~ snap fit or clamped over bead 17 and by means of one or rnore crimps 34 along shapecl portion 21. The crimps ernbed intu the inside wall 35 of the piston to hold metallic cap 19 in place on piston 11. As shown in Figure 9 one rin~ bead 17 is utilized; however it will S be understood that only the crimp melnbers 34 may be used to secure the cap member 19 to the piston melllber 11. Cap 19 provides a means of retailliny a typical brake shoe clip enterin~ open end 15 ancl also provides a groove 31 for retainirlg a typical dust boot. 0ap 19 extencls oul~lardly from end wall 14 to form heat shield 41 ~hich is adaptecl to partially cover a typical dust boot (not shown).
Heat shield elemellt 43 provides additional heat protection to the dust boot. Elemellt 45 is Formed to press fit into cap 19 and is snap fit or clanlped over bead 27 to provide groove 31 adapted to receive ancl hold the dust boot.
In a Further embodimelt of the invention the metallic cap is anchored to the plastic piston by meall; of a thread or forme(i on inside wall or the outsicle wall of the plastic piston adjacent to the operl encl of the piston and corresponding thread or threacls formecl in the portion oF the meta~llic cap which fits the open end of the plastic l)iston. 1~ single thread around the outer circumFer-ence oF the pjcl:on or ~Jithin the inner circumference oF the open end of -the pistnn suffices to hold the nletal cap in place. How-ever more than one such thread can be employecl if desired in both the open end oF tlle plastic piston as well as in the corresponcling portion of the metallic cap. The plastic threads can readily be formed cluring the moldin~ of the plastic piston. In this embodi-men-t o-f the invention the metallic cap can fit snugly against the inner wall and have corresponding grooves to match the plastic thread. Alternately the metallic cap can fi-t snugly to the out-side wall o-f the plastic piston and`have threads that correspond to the plastic threads forrned on the outside wall of the piston.
These threaded embodinlents of the invention can be further modi-fied with a bayonet lock mechanism.
The just described embodiments of the invertion are shown in Figures lO and ll.
In Figure 10 cylindrical piston 11 has a closeci end 13 and an open end 15. Threaded portion 51 extends from the external wal'i of piston ll a-t a narrowed portion 25 of the wall adjacent to the open end 15. Metallic cap 19 pre~'erably o~ steel extends over and covers end wall 14 of open end 15 of piston 11 and is secured on piston 11 by a threaded portion 53 that fits the plastic threaded portion 51 o~ the external.piston wall. Cap 19 is adapted to receive a typical brakc~ s~.oe clip. not showr1 by receiv;ng the brake shoe clip therein and securin~ the brake shoe clip by being snap fit.
In this embodilllent the outer periphery of cap 19 is proviclecl with a lip extension 55 whicll forr.ls ~roove 31 adaptecl to receive and ho'ld a typical dus-t boot not sho~ln.
Figure 11 illustrates an embc)diillent of the invention wherein pist.on ll has a narrol~ por-tion 25 contiguous to open end 15.
'I'hreacled ~)orlion 57 extencls from the internal wal'l of piston ll in narrowed wall por-tion 25. iletallic cap 19 in this elnbodiment extends over and covers end wa'll 14 of piston 11 and is attached to piston ll by a threaded portion 59 which Fits the plastic threaded portion 57. The external edge of cap l9 extends over the narrowecl wall portion 25 ancl terlninates in lip extension ~'1 which provides groove 31 adapted to receive and llold a typical dus-t boot not showll.
The Foregoin~ descri?tion and embodiMents are intended to illustrate the invention without limiting it thereby. It will be understood that various modifications can be nlacle in -the invention ~lithout departin3 from the spirit or scope thereof.
slrielcl 41 ~hicll partially covers a typical dust boot (not sho~
_ ~leat shield elenlent 43 provides furtller heat protection to the dust boot. In additiorl to this elemeni 45 is fornled ancl l)resse~
into cap 19 and is snap fit or clan~ped over beacl 27 ~o provide 2~ ~roove 31 adal)ted to receive and llold the typical dust boot. In this elnbodilnent ~roove 33 may be required to be rnacl~ined to pro-vide a n~ealls of retainin(J a brake shoe clip.
In Ficgllre ~ piston 11 ilas a narro~!ed porti()ll 25 and external rillg bead 27. t~letallic cap 1~ extends ()ver and COVt'rS end ~lall 1 3n of open end 15 and is secured to piston 11 by bein~ snap fit or clamped over bead 17 and by means of one or rnore crimps 34 along shapecl portion 21. The crimps ernbed intu the inside wall 35 of the piston to hold metallic cap 19 in place on piston 11. As shown in Figure 9 one rin~ bead 17 is utilized; however it will S be understood that only the crimp melnbers 34 may be used to secure the cap member 19 to the piston melllber 11. Cap 19 provides a means of retailliny a typical brake shoe clip enterin~ open end 15 ancl also provides a groove 31 for retainirlg a typical dust boot. 0ap 19 extencls oul~lardly from end wall 14 to form heat shield 41 ~hich is adaptecl to partially cover a typical dust boot (not shown).
Heat shield elemellt 43 provides additional heat protection to the dust boot. Elemellt 45 is Formed to press fit into cap 19 and is snap fit or clanlped over bead 27 to provide groove 31 adapted to receive ancl hold the dust boot.
In a Further embodimelt of the invention the metallic cap is anchored to the plastic piston by meall; of a thread or forme(i on inside wall or the outsicle wall of the plastic piston adjacent to the operl encl of the piston and corresponding thread or threacls formecl in the portion oF the meta~llic cap which fits the open end of the plastic l)iston. 1~ single thread around the outer circumFer-ence oF the pjcl:on or ~Jithin the inner circumference oF the open end of -the pistnn suffices to hold the nletal cap in place. How-ever more than one such thread can be employecl if desired in both the open end oF tlle plastic piston as well as in the corresponcling portion of the metallic cap. The plastic threads can readily be formed cluring the moldin~ of the plastic piston. In this embodi-men-t o-f the invention the metallic cap can fit snugly against the inner wall and have corresponding grooves to match the plastic thread. Alternately the metallic cap can fi-t snugly to the out-side wall o-f the plastic piston and`have threads that correspond to the plastic threads forrned on the outside wall of the piston.
These threaded embodinlents of the invention can be further modi-fied with a bayonet lock mechanism.
The just described embodiments of the invertion are shown in Figures lO and ll.
In Figure 10 cylindrical piston 11 has a closeci end 13 and an open end 15. Threaded portion 51 extends from the external wal'i of piston ll a-t a narrowed portion 25 of the wall adjacent to the open end 15. Metallic cap 19 pre~'erably o~ steel extends over and covers end wall 14 of open end 15 of piston 11 and is secured on piston 11 by a threaded portion 53 that fits the plastic threaded portion 51 o~ the external.piston wall. Cap 19 is adapted to receive a typical brakc~ s~.oe clip. not showr1 by receiv;ng the brake shoe clip therein and securin~ the brake shoe clip by being snap fit.
In this embodilllent the outer periphery of cap 19 is proviclecl with a lip extension 55 whicll forr.ls ~roove 31 adaptecl to receive and ho'ld a typical dus-t boot not sho~ln.
Figure 11 illustrates an embc)diillent of the invention wherein pist.on ll has a narrol~ por-tion 25 contiguous to open end 15.
'I'hreacled ~)orlion 57 extencls from the internal wal'l of piston ll in narrowed wall por-tion 25. iletallic cap 19 in this elnbodiment extends over and covers end wa'll 14 of piston 11 and is attached to piston ll by a threaded portion 59 which Fits the plastic threaded portion 57. The external edge of cap l9 extends over the narrowecl wall portion 25 ancl terlninates in lip extension ~'1 which provides groove 31 adapted to receive and llold a typical dus-t boot not showll.
The Foregoin~ descri?tion and embodiMents are intended to illustrate the invention without limiting it thereby. It will be understood that various modifications can be nlacle in -the invention ~lithout departin3 from the spirit or scope thereof.
Claims (18)
1. A composite vehicular brake piston comprised of a cylin-drical resin body having an open end and a closed end and a metallic cap extending over an end wall of said open end and secured to said body by an anchoring means, wherein said body has a narrowed portion in an outer wall thereof contiguous to said open end, the end of said cap and the portion of said body adjacent said narrowed portion providing a groove adapted to receive a dust boot.
2. The piston of Claim 1 wherein said anchoring means comprises an anchor member positioned within the open end of said body and said metallic cap is adapted to receive and hold a brake shoe clip.
3. The piston of Claim 2 wherein said anchor member is a crimp, notch or serration in the inner edge of said metallic cap which engages the piston body.
4. The piston of Claim 1 wherein at least one bead extends from the end wall of said body contiguous to said open end, and the metallic cap is secured to said body by a snap fit over said bead.
5. The piston of Claim 4 wherein said bead is positioned within the open end of said body and said metallic cap is adapted to receive and hold a brake shoe clip.
6. The piston of Claim 4 wherein said bead is positioned on the outer wall in said narrowed portion.
7. The piston of Claim 1 wherein said body has an internal bead extending from an inner wall of said body and an external bead extending from said outer wall of body, said external bead positioned on a narrowed portion of said wall contiguous to said open end, said cap adapted to receive and hold a brake shoe clip.
8. The piston of Claim 7 wherein at least one of said beads is an ejector bead.
9. The piston of Claim 1 wherein at least one thread extends from an inner or outer wall of said body contiguous to said open end to define a threaded portion of said resin body, and the metallic cap is secured to said body by at least one thread that corresponds with the threaded portion of said resin body.
10. The piston of Claim 9 wherein said thread is positioned on the inner wall of said body and said metallic cap is adapted to receive and hold a brake shoe clip.
11. The piston of Claim 9 wherein said thread is positioned on the outer wall in said narrowed portion.
12. The piston of Claim 1 wherein said body has at least one thread extending from an inner or outer wall of said body and positioned on a narrowed portion of said wall contiguous to said open end to define a threaded portion of said resin body, and the metallic cap is secured to said body by at least one thread that corresponds with the threaded portion of said resin body, said cap adapted to receive and hold a brake shoe clip.
13. The piston of Claim 12 wherein the threaded portion is located on said inner wall of said body.
14. The piston of Claim 12 wherein the threaded portion is located on said outer wall of said body.
15. The piston of Claim 1 wherein the metallic cap has means for shielding a dust boot from heat generated by the operation of a disc brake.
16. The piston of Claim 4 wherein the metallic cap has means for shielding a dust boot from heat generated by the operation of a disc brake.
17. The piston of Claim 9 wherein the metallic cap has means for shielding a dust boot from heat generated by the operation of a disc brake.
18. The piston of Claim 15, 16 or 17 wherein said end of said cap also series as the support of the heat shielding means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000460825A CA1198379A (en) | 1980-10-31 | 1984-08-10 | Piston for disc brakes |
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US20251080A | 1980-10-31 | 1980-10-31 | |
| US202,510 | 1980-10-31 | ||
| US06/270,731 US4401012A (en) | 1980-10-31 | 1981-06-05 | Piston for disc brakes |
| US270,731 | 1981-06-05 | ||
| US29364581A | 1981-08-17 | 1981-08-17 | |
| US293,645 | 1981-08-17 |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000460825A Division CA1198379A (en) | 1980-10-31 | 1984-08-10 | Piston for disc brakes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1187424A true CA1187424A (en) | 1985-05-21 |
Family
ID=27394440
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000386688A Expired CA1187424A (en) | 1980-10-31 | 1981-09-25 | Piston for disc brakes |
Country Status (9)
| Country | Link |
|---|---|
| AU (1) | AU555908B2 (en) |
| BR (1) | BR8106789A (en) |
| CA (1) | CA1187424A (en) |
| DE (1) | DE3143165A1 (en) |
| DK (1) | DK476381A (en) |
| FR (1) | FR2493457B1 (en) |
| GB (1) | GB2086531B (en) |
| IT (1) | IT1139676B (en) |
| NL (1) | NL8104582A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6401596B1 (en) | 2000-09-01 | 2002-06-11 | Court Holdings Limited | Metallic cap for molded plastic disc brake pistons |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4537289A (en) * | 1982-06-18 | 1985-08-27 | International Telephone And Telegraph Corporation | Dust boot for a disc-brake actuating cylinder-and-piston unit |
| DE3227135A1 (en) * | 1982-07-20 | 1984-01-26 | Alfred Teves Gmbh, 6000 Frankfurt | Cup piston for hydraulic or pneumatic cylinders in motor-vehicle disc brakes |
| DE3317980A1 (en) * | 1983-05-18 | 1984-11-22 | Alfred Teves Gmbh, 6000 Frankfurt | Partial lining disc brake with a pressure plate between brake shoe application element and brake shoes |
| DE3604613C2 (en) * | 1986-02-14 | 1994-06-09 | Teves Gmbh Alfred | Hydraulically actuated braking device, in particular for partial-pad disc brakes |
| DE3833766C2 (en) * | 1988-10-05 | 1994-09-01 | Teves Gmbh Alfred | Part-pad disc brake |
| DE4340453A1 (en) * | 1993-11-27 | 1995-06-01 | Teves Gmbh Alfred | Brake pistons for disc brakes |
| DE19601435A1 (en) * | 1996-01-17 | 1997-07-24 | Teves Gmbh Alfred | Pad holding spring arrangement for a partial pad disc brake, in particular for motor vehicles |
| AUPR739501A0 (en) * | 2001-08-31 | 2001-09-20 | Safe Effect Pty Ltd | Heat shield for a brake piston and brake actuator incorporating same |
| CA2645460C (en) * | 2008-11-28 | 2015-12-29 | Ray Arbesman | Piston-side brake shim |
| DE202012002212U1 (en) | 2012-03-01 | 2013-06-13 | Friedrich Nettelhoff GmbH & Co. KG, Spezialfabrik für Kleinkollektoren | Piston for a hydraulic actuator |
| DE102018122726A1 (en) | 2018-09-17 | 2020-03-19 | Bpw Bergische Achsen Kg | Sheet metal arrangement for a disc brake and disc brake with a sheet metal arrangement for a vehicle |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1183807B (en) * | 1962-12-05 | 1964-12-17 | Teves Kg Alfred | Partly lined disc brakes, especially for motor vehicles |
| DE1207160B (en) * | 1963-08-29 | 1965-12-16 | Teves Kg Alfred | Hydraulically operated partially lined disc brake |
| FR1388322A (en) * | 1963-08-29 | 1965-02-05 | Teves Kg Alfred | Partial-lined disc brake |
| FR1553530A (en) * | 1967-07-12 | 1969-01-10 | ||
| US3528301A (en) * | 1968-07-01 | 1970-09-15 | Kelsey Hayes Co | Dust seal for brake piston |
| DE2134940B2 (en) * | 1971-07-13 | 1978-09-28 | Alfred Teves Gmbh, 6000 Frankfurt | Protective cap for disc brake operating piston - has sheet plate and soft elastic ring joined on hollow ring radial inner arm |
| US3884332A (en) * | 1974-03-14 | 1975-05-20 | Dayton Walther Corp | Disc brake with cantilevered torque receiving members |
| US4170926A (en) * | 1976-03-17 | 1979-10-16 | Hooker Chemicals & Plastics Corp. | Fluted core disc brake piston |
| FR2347573A1 (en) * | 1976-04-09 | 1977-11-04 | Ferodo Sa | Spring guide for brake pad of disc brake - has support collar fitting in end of brake piston and retained by axially projecting tags |
| US4203354A (en) * | 1976-12-20 | 1980-05-20 | The Bendix Corporation | Hydraulic piston with metallic O-ring groove and non-metallic slidable surfaces |
| IT1107000B (en) * | 1978-01-23 | 1985-11-18 | Fiat Spa | RESIN PISTON FOR DISC BRAKES AND PROCEDURE FOR THE RELATED TRAINING |
| JPS54148776U (en) * | 1978-04-07 | 1979-10-16 |
-
1981
- 1981-09-22 GB GB8128635A patent/GB2086531B/en not_active Expired
- 1981-09-25 CA CA000386688A patent/CA1187424A/en not_active Expired
- 1981-10-08 NL NL8104582A patent/NL8104582A/en not_active Application Discontinuation
- 1981-10-21 BR BR8106789A patent/BR8106789A/en unknown
- 1981-10-28 DK DK476381A patent/DK476381A/en not_active Application Discontinuation
- 1981-10-29 FR FR8120329A patent/FR2493457B1/en not_active Expired
- 1981-10-30 DE DE19813143165 patent/DE3143165A1/en not_active Withdrawn
- 1981-10-30 AU AU76970/81A patent/AU555908B2/en not_active Ceased
- 1981-11-02 IT IT24819/81A patent/IT1139676B/en active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6401596B1 (en) | 2000-09-01 | 2002-06-11 | Court Holdings Limited | Metallic cap for molded plastic disc brake pistons |
Also Published As
| Publication number | Publication date |
|---|---|
| AU555908B2 (en) | 1986-10-16 |
| AU7697081A (en) | 1982-05-06 |
| IT1139676B (en) | 1986-09-24 |
| IT8124819A0 (en) | 1981-11-02 |
| BR8106789A (en) | 1982-07-06 |
| FR2493457A1 (en) | 1982-05-07 |
| GB2086531B (en) | 1984-08-08 |
| DK476381A (en) | 1982-05-01 |
| FR2493457B1 (en) | 1987-06-26 |
| DE3143165A1 (en) | 1982-07-08 |
| NL8104582A (en) | 1982-05-17 |
| GB2086531A (en) | 1982-05-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |