Brake piston reset tool

Abstract

Brake piston resetting tool (1) comprising a base body (2) with a handle (3) and an actuating lever (4) connected to the base body (2) via a joint piece (5), as well as a fixed jaw (8) and a moving jaw (9), wherein the moving jaw (9) is displaceable relative to the fixed jaw (8), characterized in that a pivoting movement of the actuating lever (4) relative to the handle (3) of the base body (2) is converted into an axial movement of the moving jaw (9) and the fixed jaw (8) and the moving jaw (9) each have an active element (20, 28), wherein the active elements (20, 28) are designed and intended to be attached to a brake and wherein the axial movement of the moving jaw (9) moves the active elements (20, 28) axially apart relative to each other and a brake piston of the brake can be moved into a starting position in the brake cylinder.

Description

[0001] The invention relates to a brake piston reset tool.

[0002] Brake pads and brake discs are among the most heavily stressed wear parts on a vehicle. The brake pads wear down and become thinner over time. This loss of thickness is compensated for by a brake piston located in the brake caliper, which continually advances and presses the brake pad against a brake disc. When replacing the brake pads, the brake piston must then be moved or pushed back into the brake cylinder to free up space for installing new brake pads.

[0003] The present invention relates in particular to a brake piston reset tool for two-wheelers, i.e. bicycles and motorcycles.

[0004] The available installation space in the area of ​​a two-wheeler's brake system is limited. Changing brake pads is correspondingly difficult. Conventional brake piston resetting tools reach their limits in this regard, particularly with smaller brake calipers, where the return travel for the brake piston is relatively short. Improvements are also desirable with regard to handling and the protection of the components involved in a brake system, especially the brake pistons. Brake systems in the high-price segment often use brake pistons made of ceramic materials. However, these are sensitive, particularly with regard to excessive transverse forces, which can lead to material chipping.

[0005] The invention is based on the object of creating a brake piston resetting tool which is improved in terms of handling and functionality and which in particular enables a safe and parallel repositioning of the piston and avoids canting.

[0006] The solution to this problem according to the invention consists in a brake piston resetting tool according to claim 1.

[0007] Advantageous embodiments and further developments of the brake piston resetting tool according to the invention are the subject of the dependent claims.

[0008] A brake piston resetting tool according to the invention comprises a base body with a handle and an actuating lever connected to the base body via a joint piece, as well as a fixed jaw and a moving jaw. The moving jaw is displaceable relative to the fixed jaw. A pivoting movement of the actuating lever relative to the handle of the base body is converted into an axial movement of the moving jaw. The fixed jaw and the moving jaw each have an active body, wherein the active bodies are configured and intended to be applied to a brake. The axial movement of the moving jaw moves the active bodies axially apart relative to one another, and a brake piston of the brake can be moved or pressed into an initial position in the brake cylinder.

[0009] The brake piston resetting tool according to the invention has a pliers-like design. The tool is designed and intended to push back brake pistons, particularly in hydraulic brake systems on two-wheelers. This procedure is necessary before replacing the brake pads. To push back the brake piston in the brake cylinder, the active elements of the brake piston resetting tool are inserted into the brake chamber after removing the old brake pads. By operating the brake piston resetting tool, the active elements are moved apart in parallel, thereby pushing the brake piston back to its original position.

[0010] A compression spring is inserted between the fixed jaw and the moving jaw in such a way that the fixed jaw and the moving jaw are closed in the rest state and the active bodies of the fixed jaw and the moving jaw contact each other.

[0011] The fixed jaw has two spaced-apart side arms, which are attached to the side cheeks of the base body. The active body of the fixed jaw is located at the end face of the side arms. The active body is preferably formed by a plate attached to the end face of the side arms and oriented at right angles to the side arms.

[0012] The fixed jaw has a counterbearing for the compression spring at its joint-side end. The counterbearing is formed, in particular, by a bevel on the fixed jaw facing the moving jaw.

[0013] The moving jaw has two spaced-apart side arms, which are guided in a U-shaped cross-sectional guide section of the base body. The active body of the moving jaw is arranged at the front of the side arms. The active body is preferably formed by a plate attached to the front of the side arms and oriented at right angles to the side arms.

[0014] The joint piece has a short lever arm and a long lever arm, which are oriented at right angles to each other, whereby the moving jaw is articulated with its joint-side end section to the short lever arm of the joint piece.

[0015] The joint piece is integrated between the base body and the actuating lever, similar to a toggle mechanism. The arrangement is designed so that the active bodies are moved apart by actuating the actuating lever. The pivoting movement of the actuating lever is thus converted into an axial movement of the moving jaw. This moves the active bodies apart and pushes a brake piston back to its original position in the brake cylinder.

[0016] The operating lever has a first bearing point and a second bearing point. The first bearing point is located at the front end portion of the operating lever, with the operating lever pivotally connected to the base body at the first bearing point. The second bearing point is located in the longitudinal direction of the operating lever at a distance from the first bearing point in a central portion of the operating lever. The operating lever is articulated at the second bearing point on the long lever arm of the joint piece.

[0017] The handle of the base body has two parallel handle limbs arranged at a distance from each other.

[0018] The operating lever has a handle end which, in an end position after the actuation of the operating lever, is directed essentially parallel to the handle of the base body.

[0019] The function of the brake piston resetting tool according to the invention is based on the well-known "knee-lever principle." The moving jaw, the joint, and the actuating lever are each connected to one another by a pivot joint. Due to the inventive design, the moving jaw is guided linearly. A movement of the actuating lever toward the handle of the base body results in a linear movement of the moving jaw. The pivot or bearing points are arranged such that the axial displacement of the actuating lever is greater than the distance traveled by the moving jaw, thus resulting in a force transmission. The active body of the fixed jaw and the active body of the moving jaw are moved axially apart. This movement is linear and guided. This movement is transmitted to the brake piston of a two-wheeled vehicle's brake system, thereby returning the brake piston to its initial position in the brake cylinder.

[0020] A compression spring ensures that the fixed jaw and the moving jaw are closed when at rest and that the active bodies of the fixed jaw and the moving jaw contact each other, i.e. lie against each other.

[0021] The compression spring also ensures that the actuating lever is returned to its original position after the tool has been activated due to the spring force. A bevel on the fixed jaw serves as a counter-bearing for the spring force of the compression spring.

[0022] In particular, both the fixed jaw and the moving jaw consist of at least two components, namely linear elements such as side legs, and the active body, particularly in the form of plates. The active bodies and the linear components are arranged at right angles to each other. The components are preferably welded together. A wear-resistant, high-strength steel is used for the plate-shaped active bodies, which are in contact with the brake pistons during use.

[0023] The plate-shaped active elements are relatively thin. Accordingly, the space required to insert the active elements into or on a brake to act on a brake piston is relatively small.

[0024] The components, particularly the base body with its gripping limbs forming the handle, the operating lever, as well as the fixed jaw and the movable jaw, are cut from a sheet metal using a laser cutting process. Any necessary holes or joint openings can be integrated during this process. The components are then beveled to achieve their final shape. Subsequently, only minor finishing steps are required to improve the surface quality.

[0025] The joint piece is also made from sheet steel, preferably using a thermal cutting process.

[0026] The brake piston resetting tool according to the invention is designed like a pair of pliers and is both easier to handle and functionally. A particular advantage is that the brake piston resetting tool according to the invention does not generate transverse forces on a brake piston when pushing the pistons back in a brake cylinder. Consequently, the brake pistons and the brake systems as a whole are treated more gently. Replacing brake pads is generally easier. The resetting action is parallel. The resetting action is guided safely and in a parallel manner. Jamming of the pistons and the attached active elements is avoided.

[0027] Another highlight is the time savings for the user. Operation is achieved by quickly and easily pressing the leg-like handle and the leg-like operating lever together. This can be accomplished quickly and reliably. Compared to brake piston resetting tools with spindle drives commonly used in practice, the operation time is significantly shorter.

[0028] The brake piston reset tool is robust, simple in design and safe to use.

[0029] The invention is described in more detail below with reference to an embodiment illustrated in the drawings. They show: Fig. 1 a brake piston resetting tool according to the invention in a perspective view; Fig. 2 the brake piston reset tool according to Fig. 1 in an exploded view of its components; Fig. 3 the brake piston reset tool in a side view in the rest position and Fig. 4 The brake piston reset tool in side view in actuated state.

[0030] Based on the Fig. 1 to 4, a brake piston reset tool 1 according to the invention is described.

[0031] The brake piston reset tool 1 has a base body 2 with a handle 3. An actuating lever 4 is connected to the base body 2 via a joint piece 5.

[0032] The joint piece 5 is angularly configured with a short lever arm 6 and a longer lever arm 7. The short lever arm 6 and the long lever arm 7 are oriented or aligned at right angles to each other.

[0033] The brake piston reset tool 1 also has a fixed jaw 8 and a moving jaw 9.

[0034] The base body 2 has a U-shaped cross-section. The base body 2 has two side panels 10, 11 arranged parallel to one another at a distance from one another, which are connected by a base web 12. The handle 3 is a one-piece, integral component of the base body 2. The handle 3 has two gripping limbs 13, 14, also arranged parallel to one another at a distance from one another. The side panels 10, 11 of the base body 2 continue into the handle 3 and merge into the gripping limbs 13 and 14, respectively.

[0035] The actuating lever 4 has a handle end 15 which, in an end position during or after the actuation of the actuating lever 4, is aligned substantially parallel to the handle 3 of the base body 2 and its two handle legs 13, 14.

[0036] The fixed jaw 8 has a longitudinal section 16 that is U-shaped and has two spaced-apart side legs 17, 18 that are connected by a base web 19. The side legs 17, 18 are fixed to the side cheeks 10, 11 of the base body 2.

[0037] An active body 20 of the fixed jaw 8 is arranged on the end face of the side legs 17, 18. The active body 20 is formed by a plate 21 fixed to the end face of the side legs 17, 18 and directed at right angles to the side legs 17, 18. The plate 21 protrudes toward the side cheeks 10, 11 of the base body 2, opposite the side legs 17, 18 of the fixed jaw 8.

[0038] The fixed jaw 8 is fixed by means of fastening elements 22, for example rivets, which are guided through mounting openings 23, 24 in the side cheeks 10, 11 and the side legs 17, 18.

[0039] The moving jaw 9 has two spaced-apart side legs 25, 26. The longitudinal section 27 of the moving jaw 9 with the side legs 25, 26 has a U-shaped cross-section. An active body 28 of the moving jaw 9 is arranged at the end face of the side legs 25, 26. The active body 28 of the moving jaw 9 is formed by a plate 29 that is fixed to the end face of the side legs 25, 26 and oriented at right angles to the side legs 25, 26.

[0040] The longitudinal section 27 of the moving jaw 9 with the side legs 25, 26 is guided in a guide section 30 of the base body 2 which is U-shaped in cross section.

[0041] At its joint-side end section 31, the moving jaw 9 is hinged to the short lever arm 6 of the joint piece 5. For this purpose, a cylindrical pin 32 is guided through bearing openings 33 in the side legs 15, 16 of the moving jaw 9 and a bearing opening 34 in the short lever arm 6 of the joint piece.

[0042] The operating lever 4 has a first bearing point 35 and a second bearing point 36.

[0043] The first bearing point 35 is located at the front joint-side end section 37 of the actuating lever 4. The actuating lever 4 is pivotally connected to the base body 2 at the first bearing point 35. This is achieved by a pin-, bolt-, or rivet-shaped coupling element 38.

[0044] The second bearing point 36 is arranged in the longitudinal direction of the actuating lever 4 at a distance from the first bearing point 35 in a central section 39 of the actuating lever 4. The actuating lever 4 is articulated at the second bearing point 36 on the long lever arm 7 of the joint piece 5. This is achieved by a stud bolt 40, which is guided through mounting openings 41, 42 in the central section 36 of the actuating lever 4 and the lever arm 7.

[0045] A compression spring 43 is inserted between the fixed jaw 8 and the movable jaw 9. The insertion is such that the fixed jaw 8 and the movable jaw 9 are closed by the spring force when at rest, with the active bodies 20, 28 of the fixed jaw 8 and the movable jaw 9 resting against each other or contacting each other.

[0046] The fixed jaw 8 has a counterbearing 45 for the compression spring 43 at its joint-side end 44. The counterbearing 45 is formed by a bevel 46 on the fixed jaw 8 directed toward the moving jaw 9. At the opposite active-body end 47 of the fixed jaw 8, a fixing point 48 is provided in the active body 20, against which the compression spring 43 is supported.

[0047] The compression spring 43 further causes the actuating lever 4 to be moved back to its starting position by the spring force after the brake piston resetting tool 1 has been actuated.

[0048] The initial position or resting state of the brake piston resetting tool 1 before operation is shown in the illustration of the Fig. 3.

[0049] The Fig. Figure 4 shows the brake piston resetting tool 1 in the actuated state. The actuating lever 4 is pivoted from its initial position toward the handle 3, and the two actuating bodies 20 and 28 are moved apart into their active position.

[0050] Before using the brake piston reset tool 1, the old or worn brake pads of a brake system are removed. This allows access to the brake piston(s) of the brake system. The brake piston reset tool 1 is guided and applied to the brake pistons from the outside with its working bodies 20, 28.

[0051] By pivoting the actuating lever 4 relative to the handle 3 of the base body 2, the pivoting movement is converted into an axial movement of the moving jaw 9. The axial movement of the moving jaw 9 is guided in the base body 2. The axial movement of the moving jaw 9 moves the active body of the moving jaw relative to the active body 28 of the fixed jaw 8. In doing so, the plates 21, 29 of the active bodies 20, 28 are moved axially apart relative to one another and the brake piston of the brake is moved or pressed into its initial position in the brake cylinder. The resetting movement is controlled and causes the piston to be pushed back in parallel. Operation is safe, quick and easy to handle. No transverse forces act on the piston during resetting. Damage to the piston due to transverse forces is avoided. Reference symbol: 1 brake piston reset tool 2 base bodies 3 Handle 4 operating levers 5 Joint piece 6 short lever arm 7 long lever arm 8 fixed jaw 9 Moving jaw 10 side panel 11 Sidewall 12 floor bridge 13 handles 14 handles 15 Handle end 16 length sections 17 side legs of 8 18 side legs of 8 19 floor bridge 20 active substances 21 plate 22 Fastening element 23 Mounting opening 24 Mounting opening 25 side legs 26 side legs 27 Longitudinal section v. 9 28 active bodies 29 plate 30 guide section 31 Final section of 9 32 cylindrical pin 33 Warehouse opening 34 Warehouse opening 35 first bearing point 36 second bearing point 37 final section 38 coupling element 39 Middle section 40 stud bolts 41 Mounting opening 42 Mounting opening 43 compression spring 44 End 45 Counter bearing 46 chamfer 47 End 48 Fixation point

Claims

[1] Brake piston resetting tool (1), which has a base body (2) with a handle (3) and an actuating lever (4) connected to the base body (2) via a joint piece (5), as well as a fixed jaw (8) and a moving jaw (9), wherein the moving jaw (9) is displaceable relative to the fixed jaw (8), characterized by that a pivoting movement of the actuating lever (4) relative in the direction of the handle (3) of the base body (2) is converted into an axial movement of the moving jaw (9) and the fixed jaw (8) and the moving jaw (9) each have an active body (20, 28), wherein the active bodies (20, 28) are designed and intended to be attached to a brake and wherein the axial movement of the moving jaw (9) moves the active bodies (20, 28) axially apart from one another and a brake piston of the brake can be moved into an initial position in the brake cylinder. [2] Brake piston reset tool (1) according to claim 1, characterized bythat a compression spring (43) is incorporated between the fixed jaw (8) and the moving jaw (9) in such a way that the fixed jaw (8) and the moving jaw (9) are closed in the rest state and the active bodies (20, 28) of the fixed jaw (8) and the moving jaw (9) contact each other. [3] Brake piston reset tool (1) according to claim 1 or 2, characterized by that the fixed jaw (8) has two side legs (17, 18) arranged at a distance from one another, which are fixed to side cheeks (10, 11) of the base body (2) and the active body (20) of the fixed jaw (8) is arranged on the end face of the side legs (17, 18), wherein the active body (20) is formed by a plate (21) which is fixed to the end face of the side legs (17, 18) and oriented at right angles to the side legs (17, 18). [4] Brake piston reset tool (1) according to claim 2 or 3, characterized bythat the fixed jaw (8) has a counter bearing (45) for the compression spring (43) at its joint-side end (44), wherein the counter bearing (45) is formed in particular by a bevel (46) on the fixed jaw (8) directed towards the moving jaw (9). [5] Brake piston reset tool (1) according to one of claims 1 to 4, characterized by that the moving jaw (9) has two side legs (25, 26) arranged at a distance from one another, which are guided in a guide section (30) of the base body (2) which is U-shaped in cross section, and the active body (28) of the moving jaw (9) is arranged on the end face of the side legs (25, 26), wherein the active body (28) is formed by a plate (29) which is fixed to the end face of the side legs (25, 26) and oriented at right angles to the side legs (25, 26). [6] Brake piston reset tool (1) according to one of claims 1 to 5, characterized bythat the joint piece (5) has a short lever arm (6) and a long lever arm (7) which are oriented at right angles to one another, wherein the moving jaw (9) is articulated with its joint-side end section (31) to the short lever arm (6) of the joint piece (5). [7] Brake piston reset tool (1) according to at least one of claims 1 to 6, characterized by in that the actuating lever (5) has a first bearing point (35) and a second bearing point (36), wherein the first bearing point (35) is arranged at the front end section (37) of the actuating lever (4) and the actuating lever (4) is pivotally connected to the base body (2) at the first bearing point (35), and the second bearing point (36) is arranged in the longitudinal direction of the actuating lever (4) at a distance from the first bearing point (35) in a central section (39) of the actuating lever (4), and the actuating lever (4) is articulated at the second bearing point (36) on the long lever arm (7) of the joint piece (5). [8] Brake piston reset tool (1) according to one of claims 1 to 7, characterized by that the handle (3) of the base body (2) has two handle legs (3) arranged parallel and spaced from one another. [9] Brake piston reset tool (1) according to one of claims 1 to 8, characterized by that the actuating lever (3) has a handle end (15) which, in an end position after the actuation of the actuating lever (4), is directed substantially parallel to the base body (2).

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