Tool for releasing a fixed part

Abstract

A tool for loosening a stuck part comprises a striking bar on which a movable striking weight is located, a stop at one end of the striking bar, a fastening element at the other end of the striking bar to which a flexible long element is attached, designed to fix it to the stuck part.

Description

[0001] The invention relates to a portable tool with which a drive shaft of a motor vehicle or a similar stuck part, in particular with an elongated basic shape, can be loosened, and a loosening method for stuck parts.

[0002] DE 34 22 798 A1 discloses a tool for loosening stuck disc brake pads by hooking steel pins into the pull holes of the brake pads and applying the necessary force by triggering a striking weight on a pull rod.

[0003] From DE 203 08 742 U1, a slide hammer puller is known for repairing dents in car bodies. For this purpose, a puller head, attached to the end of a pull rod, is fixed to the body panel using adhesive. By triggering the slide hammer, the puller head, which has a concave end surface, pulls the body panel outwards. Once the dent has been pulled outwards to the point where the panel has returned to its normal position, the adhesive can be cut with a cutting tool and the slide hammer puller removed.

[0004] GB 2531779 C describes a slide hammer designed for loosening a wishbone. A rod with a striking weight connects an upper plate, to which the wishbone is attached by means of a strap, and a lower plate on which a foot bracket is located.

[0005] The invention is based on the objective of making it possible, in contrast to the prior art, to remove a stuck part, in particular a drive shaft of a motor vehicle, using only a single, easy-to-use tool and without damaging any other parts.

[0006] This problem is solved according to the invention by a tool and a method having the features of the independent claims.

[0007] The tool for loosening a stuck part, particularly a motor vehicle drive shaft, comprises a striking bar on which a movable striking weight is guided. The striking weight can be dumbbell-shaped, allowing the user to move it securely by hand towards a stop at the end of the striking bar. A fastening element is attached to the other end of the striking bar, to which a flexible long element is hooked or fastened. The flexible long element can be a rope or rope loop, a chain, or a belt. The flexible long element serves to fix the tool to the drive shaft or other part to be loosened. An adjustment element can be provided for optionally adapting the width of a loop on the flexible long element to the part being loosened. This adjustment can be made without tools.

[0008] According to one possible embodiment, the adjusting element comprises a bent section, a bracket, and a locking screw. The U-shaped bracket can be divided into three sections: a long, threaded leg, a short leg, and a base connecting the legs. The three sections are at 90° angles to each other, with rounded edges between them being possible. The bent section has two opposing, unequal bent surfaces, each with a hole through which the long leg is inserted.The U-base, which connects to the long leg of the U, is positioned parallel to the larger of the two opposing surfaces of the bent part and terminates in the short leg of the U. This short leg is guided in a hole in the larger bent surface of the bent part, which lies parallel to the U-base, while maintaining a distance from the smaller bent surface. The manually operated locking screw is screwed onto the thread of the long leg of the U on the outer side of the shorter bent surface.

[0009] The bent section of the adjustment element optionally features a third chamfered surface, which is aligned orthogonally to the two opposing chamfered surfaces on the side of the short U-shaped leg. This third chamfered surface increases the stability of the bent section and protects the U-shaped bracket.

[0010] The tool's rope loop lies between the U-shaped base of the bracket and the larger bent surface of the bending part. When the locking screw is tightened, the rope loop is fixed and can no longer change its width.

[0011] The fastening element connects the rope loop to the striking bar. For this purpose, the fastening element can be designed, for example, as a hook with a spring-loaded latch. This latch is rotatably or pivotally attached to a slotted adapter that connects the hook to the striking bar, ensuring precise axial force transmission when striking with the striking weight. To connect the rope loop to the hook, the ends of the loop are formed as eyelets, which can be shaped and reinforced with metallic elements. The rope loop material can be, for example, steel or carbon fiber. The cross-section of the rope is not necessarily circular. For example, the rope can have a flat cross-section, meaning it can be designed like a strap.A protective covering for the rope is made, for example, of textile material or plastic.

[0012] According to one aspect of the present disclosure, a method for removing a stuck part comprises the steps of: attaching a flexible long element to the part; connecting the flexible long element to a striking bar; striking a movable striking weight against a stop on the striking bar. The flexible long element may comprise one of: a rope, a rope loop, a chain, or a strap.

[0013] According to another aspect of the present disclosure, the fastening step in a loosening process includes encircling the part.

[0014] According to another aspect of the present disclosure, a release method following the wrapping step includes the step of adjusting the width of a loop of the flexible long element. This adjustment can be tool-free.

[0015] To better understand the invention, it is explained in more detail with reference to the following figures. These show, in a highly simplified, schematic representation: Fig. 1 a tool for loosening a stuck part, especially a drive shaft. Fig. 2 an adjusting element of the tool according to Fig. 1 as well as a section of a rope loop. Fig. 3 a detailed illustration of the adjustment element. Fig. 4 a detailed illustration of a fastening element of the tool intended for connecting a striking bar to the rope loop according to Fig. 1 . Fig. 5 the tool attached to a drive shaft after Fig. 1 . Fig. 6 A flowchart of a solution procedure for a stuck part.

[0016] It should be noted at the outset that the positional references chosen in the description, such as top, bottom, side, etc., refer to the figure directly described and illustrated, and these references should be applied analogously to any change in position. The characteristics of the process steps can be adopted as device characteristics and vice versa. Identical or similar parts are designated with the same reference numerals in all figures, and their description is given only once. The representations and proportions are not to scale / partially distorted and can only be considered accurate where explicitly stated. Order numbers such as "first" and "second" serve only for differentiation, as the sequence can be changed arbitrarily. The presence of a "first" part does not necessarily mean that further parts ("second" part, etc.) follow.

[0017] A tool, designated in its entirety by reference numeral 21, for loosening a stuck part, in this case a drive shaft 20 of a motor vehicle, comprises a striking rod 1, a striking weight 2 guided thereon, and a stop 3. In the exemplary embodiment, the length of the striking rod 1 is approximately 0.5 m. The simplified striking weight 2 can be dumbbell-shaped for a secure grip by the user and has, for example, a mass between 2.0 and 4.0 kg. When striking, the striking weight 2 is moved more or less quickly along the striking rod 1 towards the stop 3, depending on the desired effect.

[0018] At the end of the striking rod 1 opposite the stop 3, a fastening element 6 is attached via an adapter 9. In the exemplary embodiment, the fastening element 6 is designed as a hook 6. This hook has a spring-loaded locking mechanism 7. The hook 6 is screwed to the slotted adapter 9 so that it can rotate or pivot, in order to enable precise axial force transmission when the striking weight 2 is triggered and thus maximize the efficiency of the tool 21.

[0019] A rope loop 4 is attached to the hook 6 by means of two eyelets 8 located at its two ends. The rope loop 4 serves to fix the tool 21 to the part to be loosened and has a length of approximately 2 m, for example. An adjusting element 5 is attached to the rope loop 4 to adjust its width. This allows the tool 21 to be universally adapted to the part to be loosened, such as a drive shaft 20, a diesel injector, or a ball joint, even in applications outside of automotive engineering.

[0020] The in Fig. 2 and Fig. 3The adjustment element 5, shown in more detail, comprises a bent steel part 10, a U-shaped bracket 14, and a locking screw 19. The bent steel part 10 has two parallel, opposite, unequal folded surfaces 11 and 12, which are referred to as the larger folded surface 11 and the smaller folded surface 12. The U-shaped bracket 14 can be divided into a long U-leg 15 with a thread 18, a short U-leg 16, and a U-base 17.

[0021] The long leg 15 of the U extends through the opposing bent surfaces 11 and 12, each of which has a hole. The U-base 17, which connects the long leg 15 and the short leg 16, lies parallel to the larger bent surface 11 and extends through a second hole in the larger surface 11 into the smaller leg 16, which maintains a distance from the smaller bent surface 12. Adjacent to the smaller bent surface 12, the bent section 10 is chamfered and has a third bent surface 13 at the other end of the chamfer. This third bent surface 13 provides stability to the bent section 10 and protects the U-shaped bracket 14. The third bent surface 13 is oriented orthogonally to both surfaces 11 and 12, as well as to a flat section of the bent section 10 that connects surfaces 11 and 12.

[0022] The rope loop 4 lies between the U-base 17 and the larger beveled surface 11. When the locking screw 19, which is screwed onto the thread 18 of the long U-leg 15, is tightened to its maximum, the rope loop 4 is thus fixed between the U-base 17 and the larger beveled surface 11, making it impossible to adjust the width of the rope loop 4.

[0023] The Fig. 4Figure 1 shows a detailed view of the fastening element 6, which is designed here as a hook 6 with a spring-loaded locking mechanism 7. The spring-loaded locking mechanism 7 allows the rope loop 4 to be replaced, if necessary, to use a rope loop 4 made of a different material or with a different length. Materials for the rope loop 4 can be, for example, steel or carbon fibers, optionally with a covering of plastic or a textile material. At the forked end of the adapter 9, the hook 6 is held by a screw in such a way that the hook 6 retains its pivoting mobility. Other mechanisms are also conceivable by which the eyelets 8 are coupled to the striking rod 1 while maintaining at least one degree of freedom. In this case, the adapter 9 is screwed to the striking rod 1.

[0024] The application of tool 21 to a drive shaft 20 of a motor vehicle is described in Fig. 5The process is illustrated. The rope loop 4 encircles the part to be loosened, in this example the front axle of a car, while the adjusting element 5 fixes the width of the rope loop 4 so that it cannot slip. With the rope loop 4 taut, the user holds the striking bar 1 with one hand, while with the other hand they strike the striking weight 2 towards the stop 3. A handle may be located behind the stop 3 (not shown). The force generated by the strike is transmitted from the striking bar 1 via the adapter 9, the hook 6, and the rope loop 4 to the drive shaft 20, thus gently loosening it. The striking process is repeated as needed until the drive shaft 20 is loosened.

[0025] Fig. 6This diagram represents a flowchart for the removal process of a stuck part. In step S1, a flexible long element, in this case a rope loop 4, is attached to or placed around the part. Here, the rope loop 4 is wrapped around the part. In an optional step S2, the width of the loop, in this case the rope loop 4, is adjusted. This adjustment can be done without tools. In step 3, the flexible long element, in this case the rope loop 4, is connected to a striking bar 1 of a tool 21. This connection can also be made at the beginning of the process, but handling is then more difficult and impractical. In step S4, a striking weight 2, which is movably mounted on the striking bar 1, is struck against a stop 3 on the striking bar 1, thus freeing the stuck part.

[0026] It should be noted at this point that the invention is not limited to the specifically illustrated embodiments, but rather that variations based on the teaching regarding the technical operation of the invention in question lie within the skill of the person skilled in this technical field.

[0027] The scope of protection is defined by the claims. However, the description and drawings must be consulted for the interpretation of the claims. Individual features or combinations of features from the different embodiments shown and described can, in themselves, represent independent inventive solutions. The problem underlying these independent inventive solutions can be found in the description.

[0028] Finally, for the sake of clarity, it should be noted that, for a better understanding of the structure of the invention, elements or parts have been shown partly out of scale and / or enlarged and / or reduced in size. Reference symbol list

[0029] 1 Impact bar 2 Impact weight 3 Stop 4 Flexible long element, or loop or rope loop 5 Adjustment element 6 Hook / fastening element 7 Spring-loaded shackle closure 8 Eyelet 9 Adapter 10 Bent part 11 Larger bent surface 12 Smaller bent surface, opposite surface 11 13 Third bent surface 14 Shackle 15 Long U-leg 16 Short U-leg 17 U-base 18 Thread 19 Locking screw 20 Drive shaft 21 Tool

Claims

1. Tool (21) for loosening a stuck part, comprising a striking bar (1) on which a movable striking weight (2) is located, a stop (3) at one end of the striking bar (1), a fastening element (6) at the other end of the striking bar (1) to which a flexible long element (4) is attached, designed to fix to the stuck part.

2. Tool (21) according to claim 1, further comprising an adjusting element (5) which is provided for adjusting the width of a loop (4) of the flexible long element.

3. Tool (21) according to claim 2, wherein the adjustment of a width of a loop (4) with the adjusting element (5) is tool-free.

4. Tool (21) according to one of claims 1 to 3, characterized by the fact thatThe adjusting element (5) comprises a bent part (10), a bracket (14) which has a long U-shaped leg (15) provided with a thread (18), a short U-shaped leg (16) and a U-shaped base (17) connecting the U-shaped legs (15, 16), and a locking screw (19) which is screwed onto the thread (18) of the long U-shaped leg (15), wherein the long U-shaped leg (15) is inserted through two holes in unequally sized opposing bent surfaces (11, 12) of the bent part (10), the U-shaped base (17) is arranged parallel to the larger of the two opposing surfaces (11, 12) of the bent part (10), and the short U-shaped leg (16) is inserted in a hole in the larger bent surface (11) of the bent part, maintaining a distance from the smaller bent surface (12). (10) is led.

5. Tool (21) according to claim 4, characterized by the fact thatthe adjusting element (5) has a third beveled surface (13) which is aligned orthogonally to the two opposing beveled surfaces (11, 12) on the side of the short U-leg (16).

6. Tool (21) according to one of claims 2 to 4, characterized by the fact that the rope loop (4) lies between the U base (17) and the larger bent surface (11) of the bending part (10).

7. Tool (21) according to one of claims 1 to 6, characterized by the fact that the fastening element (6) is designed as a hook which has a spring-loaded locking mechanism (7) and is pivotably attached to a slotted adapter (9) which connects the hook (6) to the striking bar (1).

8. Tool (21) according to one of claims 1 to 7, characterized by the fact that the rope loop (4) is held on the fastening element (6) by two eyelets (8) arranged at its ends.

9. Tool (21) according to one of claims 1 to 8, characterized by the fact thatthe rope loop (4) is designed as a steel cable loop.

10. Method for removing a stuck part, comprising the steps of: attaching a flexible long element (4) to the part; connecting the flexible long element (4) to a striking bar (1); striking a movable striking weight (2) against a stop (3) on the striking bar (1).

11. Release method according to claim 10, wherein the fastening comprises encircling the part.

12. Release method according to claim 11, wherein after wrapping, an adjustment of the width of a loop of the flexible long element (4) or a tool-free adjustment of the width of a loop of the flexible long element (4) follows.

13. A loosening method according to claim 12, wherein the adjustment is carried out without tools.

Images