DE3016193A1 - Tool holder for tyre removing rig - has controlled spacing to prevent damage to alloy wheel rims - Google Patents

Abstract

A tool holder for a tyre removing rig has the profiled tool (10) on the end of a pivot arm (8) and with vertical adjustment for the tool. The wheel is clamped to the bed of the rig and the tool inserted between the wheel rim and the tyre bead to lift the tyre off the rim. Once the bead is gripped the tool holder lifts the tool away from the rim edge. The tool is lifted by a foot control (4) operating a servo. This operates a cam to lift the arm while at the same time moving the tool radially away from the rim. In this position it can pull the tyre bead off the rim without damaging the alloy wheel rim with the wheel rotated on the bed.

Description

DEVICE FOR RELEASING TIRES FROM FELCES OF CAR,

MOTORCYCLE AND SIMILAR WHEELS.

The present invention relates to a release device from tires from rims of car, motorcycle and similar wheels, namely from one Type that contains a wheel holder with a vertical axis on a base, as well as one Swivel arm, which carries the tool to be inserted between the ceiling and the rim, said arm being angularly displaceable about a vertical axis and said Holds the tool with the help of a basically vertical rod, which in turn is in the Relation to said arm is axially back and forth displaceable.

In the known devices of this type, after the above The swivel arm is brought into the correct position, the tool pole by hand lowered so that the tool can be pushed between the ceiling and the rim; thereafter the wheel holder spindle is made to rotate so that the bead of the ceiling from the Rim comes out. The tool remains due to the pressure exerted by the ceiling bead in this last phase rest on the rim.

The grinding of the tool on the rim can, however, during the Turning the spindle can cause unwanted scoring on the rim itself. This The disadvantage is particularly noticeable on aluminum rims, which are often grinded can still cause the tool to jam, which consequently causes severe damage the rims mean.

Attempts have been made to avoid this disadvantage by following the positioning of the tool a short sideways shift of the swivel arm and a light one Lifting the tool holder rod was provided so that the tool was around a little Piece (for example by 2-3 mm) is kept at a distance from the rim. These shifts are achieved in some known devices by an adjustable screw is provided which the angular position of the swivel arm in relation to a fixed stop regulated, and further provided by an adjustment device which lifts the tool holder rod shortly before the wheel holder spindle to the Turning is brought.

Nevertheless, these known systems require considerable effort time to manually adjust the above settings, which are not always deliver satisfactory results, since an appropriate positioning of the Tools require skill and experience on the part of the operator. Also require the devices in use today always have an appropriate setting, if you go from one type of tire to another, i.e. by changing the diameter and the strength of the tire, with the consequent loss of time and the considerable inconvenience in the preparation phase.

The main purpose of the present invention is that mentioned above Avoid disadvantages of the known devices by using a device for Loosening tires from rims is supplied, which is an immediate adjustment to each Type of tire allowed and which also makes it possible with a single and a simple handle the tool to lift a little bit off the rim, before the wheel holder is made to rotate, so that any damage is certain the rims is avoided.

Another important purpose of the invention is that of plumbing Reduced to a minimum in the preparation phase and always precise positioning to secure the tool, regardless of the more or less great skill of the operator.

These and other purposes that may arise from the adjudicatory Description emerge, are achieved by the device according to the invention, which contains as follows: On a base a wheel holder spindle with vertical Axis and a swivel arm, which is to be inserted between the ceiling and the rim Tool carries, this arm angularly displaceable about a vertical axis is and carries the said tool with the help of a generally vertical rod, which in turn is axially slidable relative to the arm, wherein the device is characterized in that it is a basically horizontal one Includes pin that is axially reciprocable in a corresponding transverse Bore in said arm and mounted close to the axis of rotation of the same is; a fixed stop connected to the base and one end of the aforesaid Pen picks up; a first tensioning and adjusting element mounted on said one Arm to press said pin against said fixed stop and consequently the mentioned To move the arm angularly around the axis of rotation, a short distance away from said fixed stop; a second tensioning and adjusting element on said arm on said Tool holder rod is mounted in relation to the latter after briefly lifting to stretch the arm itself on this; an operating device for simultaneous Actuation of the first and second tensioning and adjusting devices to effect the tensioning of the tool in relation to the base, with automatic Adjustment in a position a slight distance from the rim.

After the tool has been brought up to the rim, receives In this way, a single operation simultaneously makes a short angular Shifting the arm and briefly lifting the tool while clamping the the latter in relation to the base in such a position that it is subsequently it is possible to make the wheel holder spindle rotate without the tool comes into contact with the rim during the entire withdrawal period.

Further features and advantages of the invention can be found in the detailed Description of a preferred, but not exclusive, form of implementation a device for releasing tires from rims of cars, motorcycles and the like Wheels emerge that are purely by way of example and not by way of limitation in the enclosed Drawings are shown, of which - Fig. 1 is a view of the device according to of the invention; - Fig. 2 shows the Plan view of the same device; - Fig. 3 is a side view following the line III-III of Fig. 2 was carried out; - Fig. 4 is a vertical section along a line IV-IV from Fig. 2; - Fig. 5 shows schematically the removal or Loosening a tire.

Referring to Figure 1, 1 denotes a base, the above carries a wheel holder spindle 2 with a vertical axis, which with the known Clamping means 3 is provided for a car wheel.

4 with the operating pedals for the rotation of the spindle are designated.

A fixed stand is also located above the base 1 5, at the upper end of which there is a vertical pin 6 around which a sleeve 7 can rotate. At this a horizontal arm 8 is protruding from the corresponding Robustness attached, which holds a vertical rod 9 at its free end, on the lower end of which is a tool 10 of the type commonly used for loosening tires is appropriate.

As shown in Figures 2, 3 and 4, the horizontal Arm 8 has a box-shaped structure with a rectangular cross-section and on his free end two sleeves 11 with hexagonal bore for the barrel and the guide the above-mentioned vertical rod 9, which also has a hexagonal cross-section (of course, a different cross-section for the rod 9 and the bores 11, e.g. square, triangular, etc.). The same Arm 8 also contains a first tensioning and adjusting element, which as a whole with 12 is designated and for tensioning and adjusting the movement of the arm itself the pin 6 is used, in the immediate vicinity of which it is located, as well as a second Tensioning and adjusting element, designated and arranged as a whole with 13 (Fig. 4) on the vertical rod 9 for tensioning it in relation to the arm 8.

The actuation of these tensioning and adjusting elements 12 and 13 takes place by a single operating lever 14, which is on the arm 8 at its free end is mounted as explained below.

The tensioning and adjusting element 12 contains a horizontal pin 15, which can be pushed back and forth in the longitudinal direction, in a corresponding one transverse bore in the arm 8 near the pin 6, the axis of the pin 15 is perpendicular to the axis of the arm 8. About the pen slipping out 15 from the corresponding hole in the arm 8 are to be avoided after its insertion two rings 16 are provided in the bore itself.

which are attached to the two ends of the pin 15. One end 15a of the pin 15 is also rounded, this end being intended to to press against the fixed stop plate 17, which is vertically on the upper part of the stand 5 is attached. The pin 15 is also passed through a plate 18, the one C-shaped cross-section, this plate with a bore of a slightly larger diameter than that of the pin 15 is provided, just to carry out of the pen itself.

The above-mentioned plate 18 is between the stop plate 17 and attached to the arm 8, while on the pin 15 between the plate itself and the Ring 16 a return spring 19 is inserted and attached to the end 15a.

In addition, the plate 18 is on one side with a small one Provided a hole through which a small bolt 20 pushes on the side of the arm 8 is welded (or otherwise attached), perpendicular to the Axis of the same (Figure 2). The position of the plate 18 along the bolt 20 is determined by two nuts 21 on these from both sides of the plate be screwed on.

In the rest position, the spring 19 presses the plate 18 against the arm 8, so that it rests against the arm and is perpendicular to the axis of the pin 15. In this position, the pin 15 can slide freely through the plate 18 and the arm 8. The latter can therefore be moved freely around the axis of the vertical pin 6, until it is brought into the desired position by hand, as better below is explained.

The tension and adjustment of the angular displacement of the arm 8 is achieved by a locking element 22, which is in a corresponding guide 23 runs, which is attached to the side of the arm 8 facing the stop plate 17 is (Fig. 2 and 3).

This locking element 22 has a wedge-shaped end, which for this purpose is determined, resting on a plate 24 which is attached to the arm 8, itself between this and the plate 18 to push the latter in an inclined position to force that away from facing away from the arm 8, as shown in FIG.

The alternating movement of the locking element 22 is caused by the actuation reached in one or the other direction of the operating lever 14. More accurate said this lever is mounted on a horizontal pin 25 which is rotatable and is mounted passing through the arm 8 and on which there is an eccentric projection 26 is located, to which one end of a connecting rod 27 is articulated, the other End is hinged to the locking element 22-.

The operating lever 14 can an angular movement alternately run around 900, which is limited by two stop pins 28, which on the Arm 8 are welded so that the locking element 22 alternately in the position placed between plate 18 and plate 24 or in the retracted position can be.

When the control lever 14 in the direction of arrow A in the figure 3 is pulled, the locking element 22 moves towards the pin 15 and brings the plate 18 in an inclined position. As the hole in the plate through which the pin 15 goes, in relation to the diameter of the same is appropriately calibrated, achieved one after a short angular displacement of the plate the tensioning of the same on the pin 15 and thus taking it along up to the fixed stop 17.

When the arm 8 was initially positioned so that the end 15a of the pin 15 rests on the stop 17 is caused by the above-mentioned movement of the locking element 22 in the direction of the pin tensioning the same against the stop definitely and consequently with further advancement of the wedge-shaped End 22a of the locking element 22 the displacement of the arm 8 in from the stop 17 facing away, that is, in the counterclockwise direction as indicated by the arrow C shown in Figure 2.

In this phase, the spring 19 is compressed by the plate 18.

If the operating lever 14 is then rotated in the other direction (i.e. in the direction of arrow B in Fig. 3), the return movement of the locking element is achieved 22, which then pushes out of the plate 18 and this by the action of the spring 19 can return to its rest position (at right angles to the axis of the pin 15). In this position, the arm 8 can be moved freely around the pin 6 in both directions (note that in the cocked position as in Fig. 2 the displacement of the arm 8 in a clockwise direction by the contact of the pin 15 against the stop 17 is prevented, but not counterclockwise; in the latter however, an obstruction caused by the tool 10 and the tire to be stripped is determined).

The extent of the angular adjustment displacement of the arm 8 (displacement in the direction of arrow C in Fig. 2) can be changed by moving the Nuts 21 along the bolt 20 can be changed.

For example, in the case shown in Fig. 2, the insertion of the locking element 22 between the plate 18 and the plate 24, that the axis of the arm 8 moves from the position 8a to the position 8b.

As for the tensioning and adjusting element 13, here is a similar one Structure as provided for element 12 shown above. More precisely, in the arm 8 at its free end a plate 29 (Fig. 4) nage arranges, which has a C-shaped Has cross-section in order to achieve an advantageous rigidity, the plate normally is arranged in a basically horizontal direction and a rectangular (or hexagonal) bore which allows the passage of the rod 9. With a At the end, the plate 29 rests on a cam 30 which is pulled onto a pin 25 while its other end is between the tips of two bolts 31 and 32, which are fixed vertically and aligned with one another on the arm 8, with the possibility of axial adjustment.

Between the plate 29 and the inwardly facing upper surface of the arm 8 is also located on the rod 9, a return spring 33, which the plate presses against the cam 30 and the end of the bolt 32. When turning the The cam through the operating lever 14 is the plate, which is at right angles in the rest position is to the axis of the rod 9, pushed up and forced into an inclined position (at the end opposite the cam it is between the bolts 31 and 32 held).

The inclination of the plate 29 causes the same to be tensioned the rod 9 and then, when turning the cam 30 further, determines the further Lifting the plate 29 shifting the rod 9 upwards over a short distance, which is limited by the position of the tip of the bolt 31.

The cam 30 is attached to the pin 25 so that the lifting of the plate 29 by pulling the lever 14 in the direction indicated by the arrow A. Direction takes place, or in the same direction that the actuation of the tensioning and adjusting element 12 triggers.

After lifting, the plate 29 takes the dashed lines in the Fig. 4 shows an inclined position and consequently the rod 9 is also a short one Piece (e.g. 2 - 3 mm) raised compared to the previous position, while the spring 33 is compressed. To return to the starting positions, it is sufficient to move the operating lever 14 in the opposite direction (by turning it about 900 in the direction shown by arrow B), so that the plate 29 returns to its horizontal position by the action of the spring 33, while the rod 9 is unblocked and free again in the vertical direction can move. Under these conditions, the handle 34 (Fig. 1) can be operated, which is attached to the top of the rod 9, to the tool 10 in the desired position push down, against the action of the return spring 35 (Fig. 4), which is located on the rod itself between the arm 8 and the handle 34.

According to what has been described here, the function of the device goes according to the invention.

After the operator puts the wheel on the wheel holder spindle 2 with the help the fasteners 3 has attached, he pushes the arm 8 by hand around the Pin 6 while he is actuating the Handle 34 the rod 9 pushes down until the tool 10 comes into contact with the rim 36 and opens known way between this and the ceiling 37 (Fig. 2 and 5) is inserted.

This phase does not require any pre-setting.

The rounded end 15a of the pin 15 is always held by the spring 19 pressed against the stop plate 17 and the position of the contact point depends on the diameter of the wheel that is on the wheel holder spindle. Of the Contact point 38 between pin 15 and stop plate 17 in the position shown in Fig. The position shown in Figure 2 corresponds to small-diameter wheels, while for wheels with larger diameters the same point of contact is shifted, e.g. with 39 and 40 shown in the same figure (in these cases the arm 8 by a certain distance counterclockwise from that shown in Fig. 2 Position rotated).

After inserting the tool 10 between the rim and the ceiling the operating lever 14 is pulled in the direction shown by the arrow A, which at the same time both clamping and adjustment elements 12 and 13 triggers.

The element 12 causes the pin 15 to be pressed against the stop plate 17 and consequently a counterclockwise rotation of the arm 8 for a short time Piece, while the element 13 lifts the rod 9 a little bit and it accordingly to the arm 8 tightens.

There is thus a horizontal and vertical displacement of the tool 10 performed as indicated by the arrows in Fig. 5, so that the tool itself is appropriately spaced from the rim 36, for example 2 - 3 millimeters as shown in Figure 5.

At this point the motor can be turned on, which does the rotation the wheel holder spindle 2 acts to achieve the removal of the ceiling, the Tool 10 does not come into contact with rim 36.

As already mentioned, the return to the starting position is achieved by that the operating lever 14 is pushed in the opposite direction (arrow B).

To regulate the distance between the tool 10 and the rim 36 it is sufficient to adjust the position of the nuts 21 and the bolts 31 and 32.

As can be noted, it allows the device according to the (; rfindung, clamping the tool proportionally with just a single and easy operation to the base so that it is a certain distance from the rim of the The tire that is to be pulled off protrudes to avoid any damage to the rim itself to avoid. In addition, the device according to the invention allows free movement of the arm 8 and the rod 9 for the purpose of initial positioning of the tool 10, without the need for pre-setting, regardless of the diameter and the Strength of the wheel that is attached to the wheel holder spindle 2, so that no loss of time arise when switching from one type of bike to another.

Of course, the invention is not limited to the one described above Realization form limited, but numerous changes and variants are possible that are included in the Scope of the invention.

For example, instead of being operated manually, an automatic Operation by fluid dynamics or the like can be provided, and instead of the above locking element, a cam with a vertical axis can be used will. likewise, the tensioning and adjusting elements 12 and 13 can be designed differently than the ones shown here.

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Claims (5)

PATENT CLAIMS 1) Device for releasing tires from rims of Car bikes and similar wheels, containing a wheel holder 2 on a base 1 with a vertical axis and a pivot arm 8, which carries the tool 10, the between the ceiling and the rim is pushed, whereby this arm is angled around a vertical axis is displaceable and said tool with the help of a basically vertical rod 9 carries, which in turn in relation to the said Arm is axially movable back and forth, characterized in that the device one basically horizontal, and in a corresponding transverse bore mounted axially displaceably in said arm, in the vicinity of its axis of rotation Includes pin 15; also a fixed and firmly connected to the base Stop 17 for receiving one end of said pin; a first tension and adjustment member 12 mounted on said arm around said arm Pins against to push said fixed stop and consequently angularly said arm for a short distance and away from said arm Removing stop to rotate its axis of rotation; a second tensioning and adjusting element 13, the one on said arm corresponding to said tool holder rod is mounted to the latter corresponding to the said arm after a short lifting to be tensioned in relation to the arm itself, as well as an operating device 14 for the simultaneous actuation of said first and second tensioning and adjusting elements, to achieve the clamping of the tool corresponding to the base, namely with an automatic adjustment in a position with a slight distance of the rim. 2) Device according to claim 1, characterized in that said first tensioning and adjusting element includes a plate 18 with a Bore is provided for the passage of said pin, the plate with one edge of which is adjustably attached to said arm and between it and said fixed stop 17 is mounted, between said plate and the said arm is to be pushed by the wedge-shaped end of a locking element 22, which is movably mounted on said arm 8 and by said operating device 14 is actuated, and this locking element in its retracted position the inclination of the said plate with the clamping of the same on the said Pin 15 causes, as well as the consequent angular Move over a short distance of said arm into which is fixed from said arm Stop removing direction, wherein elastic means 19 are provided to the to hold one end of said pin against said fixed stop and the to press said plate against said arm. 3) Device according to the preceding claims, characterized in that that said second tensioning and adjusting element includes a plate 29 which provided with a hole for the passage of said tool holder rod and adjustable with its one edge attached to said arm, while the the other end of the same plate onto one with the aid of the said operating device angularly displaceable cam 30 acts to tilt said plate and tensioning it on said rod while simultaneously shifting it briefly to effect the same axially in the lifting direction, elastic means 33 being provided are to keep the said plate pressed against the said cam. 4) Device according to one or more of the claims, thereby characterized in that said operating device for simultaneous actuation said first and second tensioning and adjusting elements contain a lever 14, which is connected to a pivot 15 rotatably mounted on said arm 8, said cam 30 and a projection 26 being attached to the same pin are, to which one end of a connecting rod is hinged 27, while the other end on the said one Locking element 22 articulated is. 5) Device according to the preceding claims and according to the, what has been described and illustrated here.