JP3704370B2 - Bead removal unit for tire removal machines to remove tire beads from wheel rims - Google Patents

Description

[0001]
The present invention generally relates to a bead release device suitable for installation in a tire removal machine of conventional and new construction.
In particular, but not exclusively, for light or two-wheeled vehicle tires such as passenger cars and vans, known tire removal machines are basically equipped with self-centering units with a vertical shaft that locks the wheel rim. A frame and a rear strut that supports a wheel and a tool for attaching or removing a tire from the wheel rim, adjustable in the horizontal and vertical directions.
The known type of removal machine comprises a transverse arm which is hinged to one side of the frame on one rear vertical axis and supports a bead release tool at the other end.
[0002]
Between the frame and the arm is interposed a cylinder-piston unit, one of which is combined to engage the arm, and the bead release tool is inactivated by the arm away from the corresponding side of the frame. It is rotated between a position and an operating position that contacts the bead of the wheel (rim + tire) and rests in an upright position relative to the side surface. With such a bead release tool, the working end of the bead release tool is placed at a small distance from each bead stop end of the wheel rim with respect to the bead that is first removed, and then the cylinder-piston. The unit is retracted and at the same time the bead release tool is rotated towards the machine frame.
The rotating tool working end draws a circular arc, and as a result, gradually reaches the rim portion ahead of the bead stop end for receiving the tire bead.
Basically, as it has already happened, the first incorrect or incorrect positioning of the bead release tool causes the tool to rub and damage the rim portion that receives the bead.
[0003]
Such damage is rarely a problem, as in the case of pressed sheet metal rims that receive tires with inner tubes in some cases, but in other cases, especially in the case of tubeless rims. This is not allowed when made from light or super light alloys. Alloy wheel rims are also used in high-performance automobiles where the bead-receiving part is bounded by a bead stop end on one side and a small circumferential retaining rib on the other side. It is to prevent escape from the seat.
Thus, if the bead release tool is first installed incorrectly, the wheel rim portion and bead retaining rib that receive the bead will be damaged during bead release.
In this respect, the bead release operation is carried out by acting on the most resistant part of the tire, i.e. when the bead is firmly gripped on its seat, if this seat is provided with said retaining ribs. It becomes even more difficult.
[0004]
The main object of the present invention is to provide a bead release device that can perform bead release in an accurate and precise manner and at the same time eliminate the risk of interference between the tool and the wheel rim.
Said object is achieved by a bead release device in which, during bead release, the tool moves along a path parallel to the lateral profile of the bead receptacle. In particular, the tool has its end crossing the bead stop end of the wheel rim during the first part and moves behind the bead stop end and towards the bead receiving part during the second part, A fold line path is drawn so as to move parallel to the part during the interval between the two and complete the removal of the bead.
The invention is supported, for example, on the end of a bead release tool or rod, which slides on and is locked to the elements outside the three continuous elements of a slide-out device having an axis perpendicular to the rod. Can.
The inner extraction element is firmly fixed to the base of the bead removal machine, the intermediate extraction element is slidable and lockable with respect to the inner extraction element, and the outer element is attached to the intermediate element against the action of the spring. It can slide against.
The outer element also has another freedom of movement relative to the intermediate element in a direction parallel to the tool support rod.
[0005]
Said further freedom of movement is that the outer element is guided relative to the intermediate element by at least two aligned lateral pins, the pins projecting outward from the two opposite faces of the intermediate element and facing the outer element This is achieved by being inserted into two identically shaped grooves formed on the surface.
The grooves extend partially in the direction of the axis of the pluggable device and partially in a direction inclined to the axis.
The elastic device holds the outer element in its most retracted position from the intermediate element.
A single actuating device parallel to the axis of the pluggable device causes relative movement of the three elements of the device with the aid of the locking device integrated with the intermediate element by command.
The present invention can be attached to a tire removal machine that operates on a wheel rim fixed to a rotating plate or on a wheel rim temporarily placed on the side of the machine base.
The features and structural advantages of the present invention will become apparent from the following detailed description, taken in conjunction with the accompanying drawings, illustrating a preferred embodiment of the present invention operating on a wheel rim locked onto an automatic centering unit of a tire removal machine. It will be.
[0006]
The tire removal machine shown in the drawings in particular in FIGS. 1 and 2 comprises a frame 1 on which is mounted an automatic centering unit 2 having a vertical axis and a rear column 3.
The self-centering unit 2 locks the wheel rims of different widths and diameters (Fig. 2), and the column 3 adjusts the tool (not shown) for attaching and removing the tire 5 on the rim 4 and vertically and horizontally. Provided for possible support (FIGS. 1 to 5).
In FIG. 2, the tire is not shown for clarity.
A plate 10 is attached to one side of the frame 1, and a vertical bar 11 having a square cross section extends upward from the plate 10, and the top of the bar 11 is fixed to a tire removing machine by a metal connecting plate 12 (FIG. 1). . The rod 11 constitutes an inner element of the pluggable device, and a pluggable body 13 constituting an intermediate element of the pluggable device is slidably mounted thereon. A tube 14 is slidably mounted on the intermediate element 13 and has a horizontal sleeve 15 at the top thereof, the longitudinal axis of the sleeve 15 extending substantially radially with respect to the self-centering unit. (FIG. 1). The tube 14 constitutes the outer element of the pluggable device.
[0007]
A guide and a slide shoe 16 arranged so as to prevent lateral movement of the plug 13 with respect to the bar 11 are interposed between the bar 11 and the plug 13 (FIGS. 3 and 4).
In contrast, the tube 14 is prevented from sliding laterally in only one direction relative to the sleeve 15 by suitable guides and slide shoes 17, while the tube 14 is blocked by the link device described below. Can be slid in the lateral direction of the insertable member 13 in parallel with the axis.
The link device has two pairs of idle wheels 18 facing each other (one of which is shown in FIG. 2), and the idle wheel 18 is fixed to the inserter 13 and provided on the tube 14. Each sliding groove 19 formed in a specific shape is received.
A single pin can be provided in place of the wheel 18 and the groove 19 extends as a curve as shown in FIGS. 2 and 3, respectively.
In particular, each groove 19 has a first straight portion and a last straight portion that are substantially parallel to each other, and an intermediate inclined portion.
[0008]
Basically, the groove 19 has substantially the same shape and size as the cross-sectional shape of the wheel rim 4 supporting the bead 55 of the tire 5.
An elastic element 20 is interposed between the pull-out body 13 and the tube body 14 (FIG. 3), and the elastic element 20 is in the form of a tension spring in the case of the illustrated device, the purpose of which is to keep the tube body 14 always upward. To pull. In this position, the lower end of the groove 19 supports a wheel (or pin) 18.
[0009]
A locking device 21 that can be actuated by a command is interposed between the rod 11 and the insert / detachment body 13, and the purpose thereof will become clear from the following description (see FIGS. 3 and 4).
In the case of the illustrated device, the locking device 21 comprises a clamping device having a perforated plate 121 and a small air cylinder-piston unit 210, the plate 121 being mounted around the rod 11 and hinged to the plug 13. On the other hand, the cylinder-piston unit 210 is fixed to the base of the inserter 13.
A double-acting air cylinder-piston unit is interposed between the connecting plate 10 and the top of the tube 14, and the cylinder and the rod are connected to the plate 10 and to the tube 14 in two directions perpendicular to the axis of the sleeve 15. It is hinged around the horizontal axis (Figs. 2 and 3).
[0010]
A prismatic rod 24 having a manual handle 66 is slidably mounted in the sleeve 15, and a locking device 25 similar to the locking device 21 is interposed between the rod 24 and the tube body 14. It is disguised.
The devices 21 and 25 are energized / deactivated by a common control push button (not shown) installed at the top of the tube body 14. Further, a lever (also not shown) for operating the cylinder-piston unit is provided in the vicinity of the push button. As shown in FIG. 1, the bar 24 extends toward the self-centering unit 2 and curves downward to support the frustoconical bead release disk 28.
Further, a horizontally installed support 29 is hinged on the vertical axis in the center of the tube body 14, and an inoperative position located on the side of the automatic centering unit 2 and an operating position located on the automatic centering unit 2. Can rotate between.
Finally, as will become apparent below, it will be appreciated that the purpose of the insert 13 and bar 24 selects the operating position of the bead release disk 28 based on the width and diameter of the wheel rim 4 being machined. Should.
[0011]
The operation of the device of the present invention is as follows.
At the beginning of the action,
... the wheel rim 4 with the tire 5 from which the bead is removed is locked onto the automatic centering unit 2,
... support 29 is rotated to its inoperative position,
... Cylinder-piston unit 22 is fully extended,
... the two locking devices 21, 25 are deactivated,
The wheel 18 is placed on the lower end of the groove 19.
At this point, the cylinder-piston unit 22 is retracted, so that the insert 13 and the tube 14 slide relative to the base 11 and the disk 28 moves to the height of the bead 55 in effect. The rod 24 is then adjusted by hand to position the front end of the disc 28 until just before the bead stop end 41 of the wheel rim 4. When the locking devices 21 and 25 are operated, the bar 24 is locked to the tube body 14, and the pulling body 13 is locked onto the bar 11. When the cylinder-piston unit 22 is continuously operated, the tube body 14 moves with respect to the pulling member 13 against the action of the spring 20. This movement is guided by a wheel 18 sliding in the groove 19. As a result, at this stage, the disk 28 integral with the tube body 14 moves according to the internal shape of the bead stop end 41 and the adjacent portion 42, possibly causing the internal rib 43 to jump off.
All objects of the invention are thus achieved.
[0012]
Basically, the front end of the disk 28 moves along the shape of the bead receiving seat, the remaining portion contacts the more resistant inner circumference of this profile, and the remaining portion is always at a safe distance from the seat. is there.
Return to the initial position is accomplished by actuating the cylinder-piston unit 22 in the opposite direction and deactivating the gripping device in a timely manner.
The action is also performed to remove the second bead after turning the wheel over.
Finally, when the support 29 is in its working position and is moved up and down with the tube 14, the lower bead is positioned corresponding to the upper bead stop end 41 of the wheel rim after the upper bead is removed. Should be recognized.
This frees workers from hard work.
It should also be appreciated that the disc 28 can be advantageously used to attach a tire to each wheel rim.
In particular, on the one hand it is possible to keep the bead always under the mounting tool and on the other hand it is possible to keep the already inserted part of the bead inside the groove of the wheel rim without the need for manual manipulation. It is.
[Brief description of the drawings]
FIG. 1 is a view of a device of the present invention provided on a tire removing machine as viewed from above.
FIG. 2 is a view seen in the direction of arrow II in FIG.
FIG. 3 is a partial cross-section, enlarged, front view of an apparatus according to the present invention.
4 is a cross-sectional view taken along line IV-IV in FIG.
FIG. 5 is a partially enlarged view showing a path followed by a bead release disk during a bead removing operation.
[Explanation of symbols]
4 Wheel Rim 5 Tire 11 Inner Element 13 Intermediate Element 14 Outer Element 15 Sleeve 19 Groove 21 Locking Device 22 Cylinder-Piston Unit 24 Square Bar 25 Locking Device 28 Release Tool 29 Support

Claims (7)

A bead releasing unit for a tire detaching machine for removing a tire bead from a wheel rim, comprising a pluggable device, wherein the shaft of the pluggable device is vertical and extends horizontally with respect to the wheel rim axis, The inner element of the differential device (11) Is firmly fixed to the machine base and is an intermediate element (13) Is said inner element (11) Sliding on the inner element (11) Lockable and bead release tool (28) Outer element of the pluggable device that supports (14) Elastic device (20) By said intermediate element (13) Cylinder-piston unit fixed to the axis and parallel to the axis of the pluggable device (twenty two) Fixed to the machine base by the cylinder piston unit ( twenty two ) By the movement of the intermediate element (13) At least one pin secured to the outer element (14) Guide groove provided in (19) Intermediate elements in both directions parallel and perpendicular to the axis of the pluggable device, caused by sliding inside (13) The linear movement of the outer element (14) A bead releasing unit for a tire removing machine, characterized by being configured not to receive the   The bead release tool (28) is supported by a square bar (24) that is slidably attached to the top of the outer element (14) and extends substantially radially to the wheel rim. The unit according to claim 1, characterized in that:   With the axis (23) perpendicular to the rod (24) supporting the bead release tool (28), the cylinder and rod of the control cylinder-piston unit (22) are connected to the inner element (11) and the outer element (14). The unit according to claim 1, wherein the unit is butterfly attached. A locking member connected between the outer element (14) and the square bar (24) and between the intermediate element (13) and the inner element (11) to a common actuating / stop push button The unit according to any one of claims 1 to 3, wherein (25, 21) is interposed.   The unit according to claim 4, wherein the locking device is a tightening device.   A flat support (29) between the non-actuated position away from the tire and the actuated position supporting the tire to facilitate its final withdrawal from the wheel rim by movement of said element (14). A unit according to any one of the preceding claims, characterized in that it is hinged to the outer element (14) so as to be able to rotate in a plane perpendicular to (14).   The unit according to claim 1, wherein the guide groove has an outer shape similar to a lateral outer shape of the wheel rim in the vicinity of the bead stop end so as to prevent interference between the tool and the wheel rim.

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