Brake pad assembly for a bicycle and method for assembling a brake pad assembly for a bicycle

Description

CROSS-REFERENCES TO RELATED APPLICATIONS:FIELD:

[0001] This document relates to disc brakes for bicycles. More specifically, this document relates to brake pad assemblies for bicycle disc brakes. This document also relates to methods for assembling such brake pad assemblies which are not claimed and are present for illustration purposes only.BACKGROUND:

[0002] US Patent No. 6,318,514 (Hinkens et al.) discloses a disc brake assembly that includes an improved pad holder for holding a brake pad in the brake assembly. The pad holder takes the form of a simple spring clip, preferably a wire form, that holds the rear surface of the pad tightly against the front surface of the piston or pistons of the associated caliper to prevent brake drag and brake rattle.

[0003] US Patent No. 6,394,236 (Matsuishita) discloses a bicycle cable disc brake that is provided with an adjustable return spring for moving the cable disc brake from a braking position to a release position. The cable disc brake has a cable housing, a pair of friction members, a cable actuated mechanism and a biasing member. The first friction member is movably coupled to the caliper housing between a release position and a braking position. The second caliper is also coupled to the caliper housing and arranged substantially parallel to the first friction member to form a rotor receiving slot therebetween. The cable actuated mechanism is movably coupled to the caliper housing to move the first friction member from the release position towards the second friction member to the braking position. The biasing member has a first end adjustably coupled to the caliper housing and a second end adjustably coupled to the cable actuated mechanism to urge the cable actuated mechanism to the release position.

[0004] EP0542134A1 discloses a disk brake including: a fixed body which defines an opening through which a braking disk rotates and toward which two respective opposite and coaxial seats open; pistons which, together with friction pads, compose braking shoes which are guided in the seats; a brake actuation lever composed of a pair of arms, each of which is rigidly rotationally coupled to a respective piston and having ends connected to a traction element; tear-drop notches in the pistons and asymmetrical tear-drop notches in disks which are rigid with the respective fixed body portions; and balls arranged between the notches for axially moving the pistons against one another and the engagement of the friction pads against the braking disk when, by actuating the traction element, the lever is rotated in one direction of rotation. The arms are shaped, with folded lines, so as to act elastically against the pistons so as to space them in the position for the disengagement of the pads from the braking disk when the action of the traction element ceases. US 5 803 207 A discloses a brake pad assembly in accordance with the preamble of claim 1.SUMMARY:

[0005] The following summary is intended to introduce the reader to various aspects of the detailed description, but not to define or delimit any invention.

[0006] According to the invention a brake pad assembly for a bicycle includes a first brake pad, a second brake pad, and a spreader spring. The first brake pad has a first backing plate with a first rotor facing surface, and a first friction pad secured to the rotor facing surface. The second brake pad has a second backing plate with a second rotor facing surface, and a second friction pad secured to the second rotor facing surface and facing the first friction pad. A spreader spring which functions to spread the friction pads apart from the rotor after the braking force is released, the spreader spring has a first leaf and a second leaf. At least a portion of the first leaf is fixed between the first rotor facing surface and the first friction pad, and at least a portion of the second leaf is fixed between the second rotor facing surface and the second friction pad. The spreader spring is biased towards a spread position in which the first brake pad and second brake pad are spaced apart from each other, and is moveable to a compressed position in which the first brake pad and the second brake pad are moved towards each other relative to the spread position.

[0007] According to the invention, the first friction pad has a first plate-facing surface joined to the first rotor facing surface, and the portion of the first leaf is received and fixed in a groove of the first plate-facing surface. The portion of the first leaf can be fixed in the groove by friction. The portion of the first leaf can be fixed in the groove by an adhesive.

[0008] According to the invention, second friction pad has a second plate-facing surface joined to the second rotor facing surface, and the portion of the second leaf is received and fixed in a further groove of the second plate-facing surface. The portion of the second leaf can fixed in the groove of the second plate facing surface by friction. The portion of the second leaf can be fixed in the groove of the second plate facing surface by an adhesive.

[0009] In some examples, the first leaf is forked and includes a first tine and a second tine, the first friction pad has a first plate-facing surface joined to the first rotor facing surface, and the first plate-facing surface includes the groove that comprises a first groove and a second groove. The first tine can be received and fixed in the first groove and the second tine can be received and fixed in the second groove.

[0010] In some examples, the second leaf is forked and includes a third tine and a fourth tine, the second friction pad has a second plate-facing surface joined to the second rotor facing surface, and the second plate-facing surface includes the further groove that comprises a third groove and a fourth groove. The third tine can be received and fixed in the third groove and the fourth tine can be received and fixed in the fourth groove.

[0011] In some examples, the first friction pad is adhered to the first rotor facing surface and the second friction pad is adhered to the second rotor facing surface. In some examples, the first friction pad is mechanically secured to the first rotor facing surface and the second friction pad is mechanically secured to the second rotor facing surface. In some examples, the first friction pad is molded onto the first rotor facing surface and the second friction pad is molded onto the second rotor facing surface.

[0012] According to the invention, a brake pad assembly for a bicycle includes a first brake pad, a second brake pad, and a spreader spring. The first brake pad has a first backing plate with a first rotor facing surface, and a first friction pad secured to the rotor facing surface. The second brake pad has a second brake backing plate with a second rotor facing surface, and a second friction pad secured to the second rotor facing surface and facing the first friction pad. The spreader spring has a first leaf fixed to the first brake pad and a second leaf fixed to the second brake pad. The spreader spring is biased towards a spread position in which the first brake pad and second brake pad are spaced apart from each other, and moveable to a compressed position in which the first brake pad and the second brake pad are moved towards each other relative to the spread position.

[0013] In some examples, the first leaf is permanently fixed to the first brake pad and the second leaf is permanently fixed to the second brake pad.

[0014] According to the invention, a portion of the first leaf is positioned between the first rotor facing surface and the first friction pad, and a portion of the second leaf is positioned between the second rotor facing surface and the second friction pad. The first friction pad has a first plate-facing surface joined to the first rotor facing surface, and the portion of the first leaf is received and fixed in a groove of the first plate-facing surface. The second friction pad has a second plate-facing surface joined to the second rotor facing surface, and the portion of the second leaf is received and fixed in a groove of the second plate-facing surface.

[0015] In some examples, the first leaf is forked and includes a first tine and a second tine, the first friction pad has a first plate-facing surface joined to the first rotor facing surface, and the first plate-facing surface includes a first groove and a second groove. The first tine can be received and fixed in the first groove and the second tine can be received and fixed in the second groove.

[0016] In some examples, the second leaf is forked and includes a third tine and a fourth tine, the second friction pad has a second plate-facing surface joined to the second rotor facing surface, and the second plate-facing surface includes a third groove and a fourth groove. The third tine can be received and fixed in the third groove and the fourth tine can be received and fixed in the fourth groove.

[0017] A method of assembling a brake pad assembly for a bicycle, which is not claimed and is present for illustration purposes only, includes: a) fixing at least a portion of a first leaf of a spreader spring between a rotor facing surface of a first brake backing plate and a first friction pad; and b) fixing at least a portion of a second leaf of the spreader spring between a rotor facing surface of a second brake backing plate and a second friction pad.

[0018] Step a) includes i) positioning the portion of the first leaf between the rotor facing surface of the first brake backing plate and the first friction pad, and ii) securing the first friction pad to the rotor facing surface of the first brake backing plate with the portion of the first leaf positioned between the first friction pad and the rotor facing surface of the first brake backing plate. Step b) includes iii) positioning the portion of the second leaf between the rotor facing surface of the second brake backing plate and the second friction pad, and iv) securing the second friction pad to the rotor facing surface of the second brake backing plate with the portion of the second leaf positioned between the second friction pad and the rotor facing surface of the second brake backing plate. Steps ii) and iv) can be carried out concurrently, after steps i) and iii).

[0019] In some examples, step ii) includes impaling the first friction pad onto barbs of the rotor facing surface of the first brake backing plate. In some examples, step ii) includes adhering the first friction pad to the rotor facing surface of the first brake packing plate.

[0020] Step i) includes positioning the portion of the first leaf in a groove of a plate-facing surface of the first friction pad. In some examples, step i) includes positioning a pair of tines of the first leaf in a pair of grooves of a plate-facing surface of the first friction pad.

[0021] A method of assembling a set of brake pads for a bicycle, which is not claimed and is present for illustration purposes only, includes: a) fixing at least a portion of a first leaf of a spreader spring to a first brake pad; and b) fixing at least a portion of a second leaf of the spreader spring to a second brake pad.

[0022] In some examples, the method further includes, after steps a) and b), inserting the spreader spring, the first brake pad, and the second brake pad into a brake caliper of a bicycle.

[0023] In some examples, step a) includes permanently fixing the portion of the first leaf to the first brake pad, and step b) include permanently fixing the portion of the second leaf to the second brake pad.

[0024] Step a) includes i) positioning the portion of the first leaf between a rotor facing surface of a first brake backing plate and a first friction pad, and ii) securing the first friction pad to the rotor facing surface of the first brake backing plate with the portion of the first leaf sandwiched between the first friction pad and the rotor facing surface of the first brake backing plate. Step b) includes iii) positioning the portion of the second leaf between a rotor facing surface of a second brake backing plate and a second friction pad, and iv) securing the second friction pad to the rotor facing surface of the second brake backing plate with the portion of the second leaf sandwiched between the second friction pad and the rotor facing surface of the second brake backing plate.

[0025] In some examples, steps i) and iv) are carried out concurrently.BRIEF DESCRIPTION OF THE DRAWINGS:

[0026] The drawings included herewith are for illustrating various examples of articles, methods, and apparatuses of the present specification and are not intended to limit the scope of what is taught in any way. In the drawings: Figure 1 is a perspective view of an example brake pad assembly; Figure 2 is a front view of the assembly of Figure 1; Figure 3 is a side view of the assembly of Figure 1; Figure 4 is a cross-section taken along line 4-4 in Figure 2; Figure 5 is an enlarged view of a portion of Figure 4; Figure 6 is a perspective cutaway view of the assembly of Figure 1; and Figure 7 is an enlarged perspective view of the brake pads of the assembly of Figure 1, with the second brake pad removed to show the plate facing surface of the friction pad. DETAILED DESCRIPTION:

[0027] Various apparatuses or processes will be described below to provide an example of an embodiment of the claimed subject matter. No embodiment described below limits any claim and any claim may cover processes or apparatuses that differ from those described below. The claims are not limited to apparatuses or processes having all of the features of any one apparatus or process described below or to features common to multiple or all of the apparatuses described below. It is possible that an apparatus or process described below is not an embodiment of any exclusive right granted by issuance of this patent application. Any subject matter described below and for which an exclusive right is not granted by issuance of this patent application may be the subject matter of another protective instrument, for example, a continuing patent application, and the applicants, inventors or owners do not intend to abandon, disclaim or dedicate to the public any such subject matter by its disclosure in this document.

[0028] Generally disclosed herein are brake pad assemblies for bicycles, and particularly for use in bicycle disc brakes. The brake pad assemblies can generally include a pair of brake pads and a spreader spring, all three of which are fixed together (e.g. permanently fixed together) and provided as a one-piece unit. Fixing together of the three parts can allow for ease of handling and installation. In some examples, the three parts are fixed together during assembly of the brake pads themselves. That is, in some examples, as opposed to a two-step process of assembling the brake pads and then assembling the spreader spring to the brake pads, there is a single step of assembling the brake pads and concurrently assembling the spreader spring to the brake pads.

[0029] As used herein, the term 'fixed to' means that the referenced parts cannot be manually separated without destroying or damaging the referenced parts such that they cannot be put back together (for example, the referenced parts cannot be separated by manual removal of a pin or clip or by sliding the parts apart manually). As used herein, the term 'permanently fixed to' means that the referenced parts cannot be separated, whether manually or otherwise, without damaging or destroying the referenced parts such that they cannot be put back together (for example, the referenced parts cannot be separated with the use of a tool or machine).

[0030] Referring now to Figures 1 to 3, an example brake pad assembly 100 is shown. The assembly 100 includes a pair of brake pads, 102a, 102b. Each of the brake pads 102a, 102b has a respective backing plate 104a, 104b with a respective rotor facing surface 106a, 106b. A respective friction pad 108a, 108b is secured to each rotor facing surface 106a, 106b. In this document, the brake pads 102a, 102b may in some instances be referred to as a 'first' brake pad 102a and a 'second' brake pad 102b. Furthermore, the backing plate 104a, rotor facing surface 106a, and friction pad 108a of the first brake pad 102a may be referred to as a 'first' backing plate 104a, 'first' rotor facing surface 106a, and 'first' friction pad 108a. Likewise, the backing plate 104b, rotor facing surface 106b, and friction pad 108b of the second brake pad 102b may be referred to as a 'second' backing plate 104b, 'second' rotor facing surface 106b, and 'second' friction pad 108b. The first friction pad 108a and second friction pad 108b face each other, so that in use, upon application of a braking force (e.g. by the squeezing of hand breaks), the friction pads 108a, 108bare compressed towards each other to squeeze a rotor of the bicycle (not shown).

[0031] The backing plates 104a, 104b may optionally be steel backing plates, and may, for example, be fabricated by stamping.

[0032] The friction pads 108a, 108b may be made from any suitable friction material, such as resin with various additives and fillers. As will be described in further detail below, the friction pads 108a, 108b may optionally be pre-formed and secured to the respective rotor facing surfaces 106a, 106b, for example by using a mechanical fastener or an adhesive. Alternatively, the friction pads 108a, 108b may be molded onto the respective rotor facing surfaces 106a, 106. Optionally, the rotor facing surfaces 106a, 106b may include barbs for retaining the friction pads 108a, 108b, for example by impaling pre-formed friction pads 108a, 108b onto the barbs, or by moulding the friction pads 108a, 108b onto the barbs.

[0033] Referring still to Figures 1 to 3, the brake pad assembly 100 further includes a spreader spring 110, which functions to spread the friction pads 108a, 108b apart from the rotor after the braking force is released. Particularly, the spreader spring 110 is biased towards a spread position, shown in Figures 1 to 7, in which the first brake pad 108a and second brake pad 108b are spaced apart from each other. The spreader spring 110 is moveable to a compressed position (not shown) in which the first brake pad 108a and the second brake pad 108b are moved towards each other relative to the spread position.

[0034] Referring still to Figures 1 to 3, as mentioned above, the brake pads 102a, 102b are fixed to the spreader spring 110 - i.e. they cannot be manually separated without destruction or damage of the parts, as described above. More specifically, in the example shown, the brake pads 102a, 102b are permanently fixed to the spreader spring 110 - i.e. they cannot be separated at all without destruction or damage of the parts as described above. Namely, in the example shown, the spreader spring 110 has a pair of leaves 112a, 112b, also referred to herein as a first leaf 112a and a second leaf 112b. The first leaf 112a and the second leaf 112b are joined together at a generally U-shaped spring joint 114, which is resiliently flexible. The first leaf 112a is permanently fixed to the first brake pad 102a, and the second leaf 112b is permanently fixed to the second brake pad 102b.

[0035] The leaves 112a, 112b of the spreader spring 110 may be fixed to the respective brake pads 102a, 102b in a variety of ways, for example by the use of adhesives or mechanical fasteners such as rivets. Furthermore, only a portion of each leaf 112a, 112b may be fixed to the respective brake pads 102a, 102b, or an entirety of each leaf 112a, 112b may be fixed to the respective brake pads 102a, 102b. Referring to Figures 4 to 7, in the example shown, a portion of the first leaf 112a is positioned and fixed in place between the first rotor facing surface 106a and the first friction pad 108a, and a portion of the second leaf 112b is positioned and fixed in place between the second rotor facing surface 106b and the second friction pad 108b. More specifically, referring to Figure 7, the first friction pad 108a has a first plate facing surface 116a, and the plate facing surface 116a has a pair of grooves 118a, 118b therein (also referred to herein as a first groove 118a and a second groove 118b). The first leaf 112a of the spreader spring 110 is forked, and includes a pair of tines 120a, 120b (also referred to herein as a first tine 120a and a second tine 120b). The first tine 120a is received and fixed in the first groove 118a and the second tine 120b is received and fixed in the second groove 118b. Likewise (and not shown), the second friction pad 108b has a second plate facing surface, and the second plate facing surface has a pair of grooves therein (also referred to herein as a third groove and a fourth groove). The second leaf 112b of the spreader spring 110 is forked, and includes a pair of tines (also referred to herein as a third tine and a fourth tine). The third tine is received and fixed in the third groove and the fourth tine is received and fixed in the fourth groove.

[0036] In the example shown, the tines 120a, 120b are fixed in the grooves by friction and by the use of adhesives - i.e. the tines 120a, 120b are tightly sandwiched between the respective friction pads 108a, 108b and backing plates 104a, 104b, and an adhesive is used to further fix the tines 120a, 120b in place. In alternative examples, adhesives alone can be used to fix the tines in the grooves, or friction alone can be used to fix the tines in the grooves.

[0037] Referring to Figure 7, the rotor facing surfaces 106b has a plate width 107b, and the friction pad 108b has a pad width 109b. In the example shown, the plate width and the pad width are approximately equal. That is, because the third and fourth tines are positioned in the third and fourth grooves, it is not necessary to leave a space on either side of the friction pad 108b for the tines to sit, and the friction pad 108b can extend the full width of the backing plate104b. This can allow for improved braking efficiency.

[0038] Referring back to Figures 1 and 2, the first backing plate 104a, first leaf 112a, second backing plate 104b, and second leaf 112b each have a respective aperture extending therethrough. For simplicity, only the aperture 122 of the first backing plate 104a is labelled in Figures 1 and 2. The apertures are aligned along a common axis. Upon installation of the assembly 100 in a brake caliper of a bicycle, a pin or other fastener can be inserted through the apertures, in order to retain the assembly 100 in place in the caliper. Since in the example shown the apertures are aligned along a common axis and fixed in this position, the pin can be inserted with relative ease.

[0039] In general, in order to manufacture the assembly, at least a portion of the first leaf 112a (e.g. the first tine 120a and second tine 120b) can be positioned between the first rotor facing surface 106a and the first friction pad 108a, and the first friction pad 108a can then be secured to the first rotor facing surface 106a, with the portion of the first leaf 121a positioned between the first friction pad 108a and the first rotor facing surface 106a, to concurrently fix the first friction pad 108a to the first backing plate 104a and the first leaf 112a to the first brake pad 102a. Likewise, at least a portion of the second leaf 112b (e.g. the third and fourth tines) can be positioned between the second rotor facing surface 106b and the second friction pad 108b, and the second friction pad 108b can then be secured to the second rotor facing surface 106b with the portion of the second leaf 112b positioned between the second friction pad 108b and the second rotor facing surface 106b, to concurrently fix the second friction pad 108b to the second backing plate 104b and the second leaf 112b to the second brake pad 102b. More specifically, with reference to the first brake pad 102a, the first tine 120a and second tine 120b of the first leaf 112a can be nested within the first groove 118a and second groove 118b of the first friction pad. A bead of adhesive can then be applied to the first plate facing surface116a and / or to the first rotor facing surface 106a. The first backing plate 104a can then be aligned with the first friction pad 108a, with the first 120a and second 120b tines therebetween, and the first backing plate 104a and first friction pad 108a can be pressed together until the adhesive has set and / or cured and / or dried. This can be repeated with the second brake pad 102b, optionally concurrently with the first brake pad 102a.

[0040] In some examples (not shown), in addition to or as an alternative to the use of adhesives, barbs on the rotor facing surfaces of the backing plates can be used to secure the backing plates to the friction pads, and thereby fix the spreader spring to the brake pads. Such barbs are described for example in US Patent No. 6431331 (Arbesman) and US Patent Application Publication No. 20160363183 (Arbesman et al.), both of which are incorporated herein by reference. In such examples, the friction pads can optionally be molded onto the backing plates, with the tines of the spreader spring between the friction pads and the backing plates. Alternatively, the friction pads can be pre-formed and then pressed on to the backing plates, with the tines of the spreader spring between the friction pads and the backing plates, to impale the friction pads on the barbs. In such cases, the barbs can optionally impale the tines, or can be flattened by the tines. An example of a backing plate 804 including barbs 824 is shown in Figure 8. The backing plate 804 is shown prior to being secured to a friction pad.

[0041] In order to install the assembly, the spreader spring 110, first brake pad 102a, and second brake pad 102b - fixed together as a one-piece unit - can be inserted into a brake caliper. A pin or other fastener can then be inserted through the apertures of the plates and leaves, in order to retain the assembly in position in the brake caliper. Since the parts are fixed together as a one-piece unit, the assembly can be inserted with relative ease, and the pin can be inserted through the assembly with relative ease. Furthermore, in order to remove the assembly (e.g. for replacement), the spreader spring 110, first brake pad 102a, and second brake pad 102b - fixed together as a one-piece unit - can be removed from the brake caliper

[0042] The brake pads 102a, 102b shown in Figures 1 to 7 are sized and shaped to fit a particular model of brake caliper. In alternative examples, brake pad assemblies may include various other sizes and shapes of brake pads.

[0043] While the above description provides examples of one or more processes or apparatuses, it will be appreciated that other processes or apparatuses may be within the scope of the accompanying claims.

Claims

1. A brake pad assembly (100) for a bicycle brake, comprising: a first brake pad (102a) having a first backing plate (104a) with a first rotor facing surface (106a), and a first friction pad (108a) secured to the first rotor facing surface (106a); a second brake pad (102b) having a second backing plate (104b) with a second rotor facing surface (106b), and a second friction pad (108b) secured to the second rotor facing surface (106b) and facing the first friction pad (108a); and a spreader spring (110) which functions to spread the friction pads (108a, 108b) apart from the rotor after the braking force is released, the spreader spring (110) having a first leaf (112a) and a second leaf (112b), wherein at least a portion of the first leaf (112a) is fixed between the first rotor facing surface (106a) and the first friction pad (108a), and at least a portion of the second leaf (112b) is fixed between the second rotor facing surface (106b) and the second friction pad (108b), and wherein the spreader spring (110) is biased towards a spread position in which the first brake pad (102a) and second brake pad (102b) are spaced apart from each other, and is moveable to a compressed position in which the first brake pad (102a) and the second brake pad (102b) are moved towards each other relative to the spread position, characterized in that, a first plate-facing surface (116a) of the first friction pad (108a) is joined to the first rotor facing surface (106a), and the portion of the first leaf (112a) is received and fixed in a groove (118a) of the first plate-facing surface (116a), wherein the portion of the first leaf (112a) is fixed in the groove (118a) by at least one of an adhesive and friction, wherein the second friction pad (108b) has a second plate-facing surface joined to the second rotor facing surface (106b), and the portion of the second leaf (112b) is received and fixed in a further groove of the second plate-facing surface, and wherein the portion of the second leaf (112b) is fixed in the further groove of the second plate facing surface by one of an adhesive and friction.

2. The brake pad assembly (100) of claim 1, wherein the first leaf (112a) is forked and comprises a first tine (120a) and a second tine (120b), the first friction pad (108a) has the first plate-facing surface (116a) joined to the first rotor facing surface (106a), and the groove (118a) of the first plate-facing surface (116a) comprises a first groove (118a) and a second groove (118b), and the first tine (120a) is received and fixed in the first groove (118a) and the second tine (120b) is received and fixed in the second groove (118b).

3. The brake pad assembly (100) of claim 2, wherein the second leaf (112b) is forked and comprises a third tine and a fourth tine, the second friction pad (108b) has the second plate-facing surface joined to the second rotor facing surface (106b), and the further groove of the second plate-facing surface comprises a third groove and a fourth groove, and the third tine is received and fixed in the third groove and the fourth tine is received and fixed in the fourth groove.

4. The brake pad assembly (100) of any one of claims 1 to 3, wherein the first friction pad (108a) is adhered to the first rotor facing surface (106a) and the second friction pad (108b) is adhered to the second rotor facing surface (106b).

5. The brake pad assembly (100) of any one of claims 1 to 4, wherein the first friction pad (108a) is mechanically secured to the first rotor facing surface (106a) and the second friction pad (108b) is mechanically secured to the second rotor facing surface (106b).

6. The brake pad assembly (100) of any one of claims 1 to 5, wherein the first friction pad (108a) is molded onto the first rotor facing surface (106a) and the second friction pad (108b) is molded onto the second rotor facing surface (106b).