Portable tire changing stand

Abstract

The portable tire changing stand includes a frame 1, a rear support leg 2, and a removable horizontal front leg 3 attached to the lower end of the frame 1. A removable center shaft 4, perpendicular to the frame 1, is attached to the center of the frame 1 and has a ratchet mechanism 12 with a tire mounting head 13 attached to it. The center shaft 4 has a stepped bushing 16 for accurate centering of the rim. Plastic support surfaces 5 are attached to the frame 1 above and below the center shaft 4. A socket 7 is attached to the ratchet mechanism 12 and a lever 8 attached to it moves the mounting head 13 around the center shaft 4.

Description

[Technical field]

[0001] The present invention relates to a tire changing machine, which is a manually operated portable tire changing stand for motorcycles. [Background technology]

[0002] Various kinds of tire changing stands are known in the art. The stand of Non-Patent Document 1 is considered to be the closest solution. It is a tire changing stand for changing motorcycle tires, mainly on motorcycles with cast rims, and it consists of a cross-shaped frame with adjustable legs, a center shaft attached to the center of the frame and facing upwards, an extendable lever system that moves up and down and is attached to the center shaft to hold the rim in place after placing it on the frame, a rotating tire mounting head, and a lever.

[0003] The rim of the tire to be replaced is placed on the frame and the center shaft. A lever is attached to a socket attached to the bracket and the tire bead is pushed out of the rim by a plate on one side. Pressure is repeatedly applied by rotating the rim until the entire tire bead is pushed out of the rim. The wheel is then rotated to the other side and the same action is repeated. A rod is then placed on the frame to prevent the rim from rotating, after which a rotating tire mounting head is mounted on top of the rim. The tire bead is pulled onto the tire mounting head by the tire lever and the tire is removed from the rim by rotating the tire mounting head with the lever. A new tire is mounted on the rim by rotating the tire mounting head with the lever. A disadvantage of this solution can be considered that the tire change is performed in an unnatural low position, i.e. it is not ergonomic. The frame moves when the lever is rotated, but the tire mounting head does not move relative to the rim.

[0004] A known tire changing machine is that of non-patent document 2, which uses a long lever that contacts the center shaft of the tire changing machine and at its end has a special part for mounting and dismounting the tire.

[0005] A standard industrial electric tire changing machine used by professional tire technicians is known from the non-patent document 3. In this solution, the rim is rotatably mounted by four grippers on the outer edge of the rim. During tire changing, the wheel rotates and the tire mounting head remains stationary.

[0006] Other tire changing machines or related devices are known, such as that described in Patent Document 1. It is a portable tire changing stand, which comprises a frame, a rear support leg, a horizontal leg attached to the lower end of the frame, a lever system, a plate attached to the lever by which the tire bead is pushed out of the rim, and the frame arranged at an angle of 30 to 90 degrees with respect to the bottom surface of the tire changing stand. This device only has a bead breaker function. It cannot remove or install a tire on its rim.

[0007] Another device is described in US Pat. No. 5,399,313, which comprises a base, means for supporting a rim and its tire on the base in a substantially upright position with the ability to rotate about their common axis, a tire tool adapted to engage the tire, and a mounting for the tire tool, which allows the tire tool to move towards and away from the tire with limited play only around the axis of the supported rim and tire, allowing the removal of the tire from the rim by a manually applied force and by cooperation with the rim and tire, enabling their manual rotation about their axis to bring new parts of the tire into the limited area of ​​operation of the tire tool. This device also has only a bead breaker function. It cannot remove or install a tire on its rim.

[0008] Patent document 3 discloses a portable tire changing machine system for cart tires mounted on wheel rims, which includes a support base, a support rotating means, a support plate for supporting the wheel rim, and a connecting means protruding from the support plate and configured to be inserted into the inner cavity of the wheel rim and engage with its centering fixing holes. The portable tire changing machine system comprises a covering element configured to engage and cover the outer annular edge of the wheel rim so as to prevent an actuating lever used to remove the tire from the wheel rim during a removal procedure from contacting the outer annular edge. The portable tire changing machine comprises a driving means for rotating the support means, and a mounting means comprising an arm, the arm being movable and having a first end fixed to the support base and a second end to which a lead-in element is fixed, made of a non-metallic material and configured to abut the outer annular edge of the wheel rim in a mounting procedure for inserting and mounting a tire on the wheel rim by rotating the support means.

[0009] US Patent No. 4,393,633 describes a tire changing machine which comprises a support, a main rim clamping jaw on the support, means for extending and retracting the jaw, an additional rim clamping jaw movable together with the main jaw and designed to clamp the rim in a position different from that clamped by the main jaw, and means for removing the tire from the rim with the rim clamped by the additional jaw. [Prior art documents] [Patent documents]

[0010] [Patent Document 1] U.S. Pat. No. 2,474,926 [Patent Document 2] U.S. Patent No. 1,591,193 [Patent Document 3] European Patent Application Publication No. 3815933 [Patent Document 4] U.S. Pat. No. 1,646,511 [Non-patent literature]

[0011] [Non-Patent Document 1] https: / / max2h.com / en / tyre-changer / road-race-track / tyre-changer-evo2 / [Non-Patent Document 2] https: / / www.nomartyrechanger.com [Non-Patent Document 3] https: / / www.bestbuyautoequipment.com / nationwide-motorcycle-tyre-changers-p / nationwidenw-400.htm Summary of the Invention

[0012] The object of the invention is a tire changing stand which has the advantageous effect of being small, portable and easy to transport due to its light weight (approximately 13 kg).

[0013] The portable tire changing machine includes a frame that sits at an angle of 30 to 90 degrees relative to the bottom of the tire changing machine.

[0014] The portable tire changing stand further includes a rear support leg and a removable horizontal front leg attached to the lower end of the frame. A removable center shaft perpendicular to the frame is attached to the center of the frame and has a ratchet mechanism with a tire mounting head attached to it. The center shaft has a stepped bushing for accurate centering of the rim.

[0015] Plastic support surfaces are attached to the frame above and below the center shaft. A socket is attached to a ratchet mechanism with a removable lever that moves the mounting head around the center shaft. The distance of the tire mounting head from the center shaft can be extended by changing the position of the arm. The portable tire changing stand also includes a rod to prevent the wheels from rotating, and a lever system whose position is At the top of the frame It is adjustable by changing the distance of the bracket to the center shaft. A removable lever is attached to a socket attached to the bracket, and the tire bead is pushed off the rim by a plate attached to the lever. [Brief description of the drawings]

[0016] [Figure 1] FIG. 1 shows a schematic diagram of a portable tire changing stand. [Diagram 2] FIG. 2 shows the position of the tire mounting head. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] The tire changing stand shown in Figures 1 and 2 is composed of a frame 1, a rear support leg 2 that can be rotated relative to the frame into a folded position, and a horizontal front leg 3 that is attached to the lower end of the frame and can be removed. The frame is disposed at an angle of 30 to 90 degrees relative to the bottom of the tire changing stand. A removable center shaft 4 perpendicular to the frame 1 is attached. Frame The central part is fitted with a plastic support surface 5 of the rim attached to the frame 1 above and below the central shaft 4, the plastic support surface 5 being movable relative to the frame 1. A lever system is attached to the upper end of the frame 1, the position of which is adjustable according to the diameter of the rim by changing the distance of the bracket 6 in relation to the central shaft 4. A lever 8 is attached to a socket 7 attached to the bracket 6, and the tire bead is pushed out of the rim by a plate 9 attached to it. The lower side plastic Near the support surface, the frame has a hole 10, in which a rod 11 is fixed to prevent the rim from rotating. A ratchet mechanism 12 having a tire mounting head 13 is arranged on the center shaft 4. The distance of the tire mounting head 13 from the center shaft 4 can be extended by changing the position of an arm 14. Socket 15 is attached to the ratchet mechanism 12, the lever 8 is inserted therein, and the tire mounting head 13 is moved around the center shaft 4. A stepped bushing 16 for centering the rim is disposed on the center shaft.

[0018] The rim on which the tire is to be replaced is placed on the frame 1 and on the center shaft 4. To center the rim exactly, a stepped bushing 16 is placed on the center shaft 4. A lever 8 is inserted into the socket 7, the plate 9 of the lever 8 is placed against the side of the tire, and the tire bead is pushed out of the rim with the aid of the lever 8. The position of the bracket 6 can be changed to achieve the correct position of the plate 9 in relation to the rim. The rim is rotated and pressure is applied from different angles until the tire bead is completely pushed out of the rim. The rim is then rotated to the other side and the same process is repeated. To remove the tire from the rim, a rod 11 that prevents the rim from rotating is placed on the frame 1 and a ratchet mechanism 12 with a tire mounting head 13 is placed on the center shaft 4. The tire mounting head 13 is placed on the edge of the rim and the tire bead is partially pulled onto the tire mounting head 13 by the tire lever. The lever 8 is then placed in the socket 15 of the ratchet mechanism 12 and the tire mounting head 13 is moved by pressing down the lever 8. To achieve the highest stability of the tire changing machine, the lever 8 is moved up to a quarter turn. The ratchet mechanism 12 allows the lever to return freely to its initial position when the lower position of the lever is reached, allowing the movement to be repeated. The repeated up and down movement of the lever 8 causes the tire mounting head 13 to rotate once on the rim, as a result of which one bead of the tire is removed. The mutual position of the frame 1 and the front legs 3 of this tire changing stand forms a stable system for depressing the lever 8, and the structure remains in place during the movement of the tire mounting head 13 without the user needing to stabilize it. The same technique is repeated to remove the other bead of the tire.

[0019] To mount the tire, the tire is manually pushed as far as possible onto the edge of the rim and then both sides of the tire are pressed together by operating the tire mounting head 13 by means of the lever 8 as previously described. Beadis installed. To remove the rim from the tire changing stand, the lever 8, the ratchet mechanism 12 with the tire mounting head 13 and the stepped bushing 16 must be removed. Moving the tire changing stand from the transport position to the working position is easy and fast and can be done without additional tools. It can be used to change tires on motorcycles with rims of various diameters, it is mainly intended for tubeless tires and tires with inner tubes.

[0020] Known solutions are characterized by the fact that they are relatively low and that the lever is pulled horizontally. Thus, the tire changing machine is unstable and inconvenient to use. The present solution eliminates this problem, since the tire changing machine is placed at an angle, which allows the tire changing to be performed in an upright position and which remains stable even when the lever is pressed. Solutions known from the current state of the art are also characterized by the fact that the tire changing stand has to be bolted / rigidly connected to the ground / floor surface, which limits the portability and place of use of the device. These industrial tire changing devices are heavy and not portable. On the other hand, the present tire changing machine is light and easy to disassemble and assemble, which makes it convenient to transport.

[0021] Two factors lead to the greater stability of this solution. a) When operating the tire mounting head, the force applied to the lever is directed through the frame to the underside of the tire changing stand, which means that the user does not have to hold the tire changing stand in place at the same time. b) The ratchet mechanism between the lever and the tire mounting head ensures that the lever is pressed from the same position throughout the entire tire changing process.

Claims

1. A portable tire changing stand comprising: a frame (1); rear support legs (2); removable horizontal front legs (3) attached to the lower end of the frame (1) arranged at an angle of 30 to 90 degrees with respect to the bottom surface of the tire changing stand; a removable center shaft (4) perpendicular to the frame (1) and attached to the center of the frame (1); plastic support surfaces (5) for rims attached to the frame above and below the center shaft (4); a bracket (6) attached to the upper end of the frame (1); a socket (7) attached to the bracket (6); and a rod (11) fixed to the frame (1) near the lower plastic support surface (5) to prevent rotation of the rim, wherein the rear support legs (2) are rotatable with respect to the frame (1); The tire changing stand further comprises a ratchet mechanism (12) attached to the center shaft (4), a tire mounting head (13) and a socket (15) attached to the ratchet mechanism (12), a removable lever (8) insertable into the socket (7) or the socket (15), and a plate (9) attached to the lever (8) and contacting the side of the tire, wherein after the lever (8) is inserted into the socket (15) and downward pressure is applied to the lever (8), the tire mounting head (13) is moved around the center shaft (4), and the ratchet mechanism (12) freely returns the lever (8) to its initial position, allowing the movement to be repeated.

2. 2. The portable tire changing stand according to claim 1, wherein a stepped bushing (16) is arranged on the center shaft (4) for accurate centering of the rim.

3. A portable tire changing stand as described in claim 1 or 2, wherein the position of the bracket (6) is adjustable according to the diameter of the rim by changing its distance to the center shaft (4).

4. A portable tire changing stand as described in claim 1 or 2, further comprising an arm (14) between the tire mounting head (13) and the ratchet mechanism (12), and the distance between the tire mounting head (13) and the center shaft (4) can be extended by changing the position of the arm (14).

5. A portable tire changing stand as described in claim 3, further comprising an arm (14) between the tire mounting head (13) and the ratchet mechanism (12), and the distance between the tire mounting head (13) and the center shaft (4) can be extended by changing the position of the arm (14).

6. A portable tire changing stand as described in claim 1 or 2, wherein the frame (1) further has a hole (10) for fixing the rod (11) to the frame (1).

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