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Patent Searching and Data


Title:
CUTTING DEVICE FOR THE REMOVAL OF TREAD SURFACES FROM VEHICLE TYRES
Document Type and Number:
WIPO Patent Application WO/2001/043903
Kind Code:
A1
Abstract:
Rotor wheel (1) for a cutting device for the removal of tread surfaces from vehicle tyres, comprising cutting members (2, 3) protruding from its periphery that are connected with a controllable steering device (5) and are thereby radial moveable between an outer position, in which the cutting members (3) protrude outside of the rotor wheel (1), and an inner position, in which the cutting members (3) are within the periphery of the rotor wheel (1). The steering device (5) is linearly moveable in the longitudinal direction of the rotor wheel (1) and comprises steering templates (5.1) for a guide (3.2) that is arranged on respective cutting member (3). The cutting members (3) may comprise sets of rasp elements (3.1) and/or U-shaped knifes (2), the ends of which are attached in the rotor wheel (1), each knife (2) showing an inclination towards the radius of the rotor wheel (1) to form a relief angle (a) at the point of attachment when the knife (2) is attached tangentially to the vehicle tyre.

Inventors:
JAATINEN JARI-PEKKA (SE)
Application Number:
PCT/US1999/029684
Publication Date:
June 21, 2001
Filing Date:
December 15, 1999
Export Citation:
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Assignee:
JATECH INC (US)
JAATINEN JARI PEKKA (SE)
International Classes:
B29D30/68; (IPC1-7): B23B7/00
Foreign References:
US2694815A1954-11-23
US3530745A1970-09-29
US2263085A1941-11-18
US1195436A1916-08-22
US2097898A1937-11-02
US2046241A1936-06-30
US2568683A1951-09-18
US2637224A1953-05-05
US3264904A1966-08-09
Attorney, Agent or Firm:
Fasth, Rolf (FL, US)
Download PDF:
Claims:
CLAIMS
1. Rotor wheel (1) for a cutting device for the removal of tread surfaces from vehicle tyres, comprising from its periphery protruding cutting members (2, 3), characterised in that the cutting members (3) are connected with a controllable steering device (5) and are thereby radial sliding between an outer position, in which the cutting members (3) protrude outside of the rotor wheel (1), and an inner position, in which the cutting members (3) are within the periphery of the rotor wheel (1).
2. Rotor wheel (1) according to claim 1, characterised in that the steering device (5) is linearly sliding in the longitudinal direction of the rotor wheel (1) and comprises steering templates (5. 1) for one or more cutting members (3) and that respective steering template (5. 1) shows notches (5. 2) for a guide (3. 2) that is arranged on respective cutting member (3).
3. Rotor wheel (1) according to claim 2, characterised in that the each steering template (5 : 1) consists of a plate that extends in the longitudinal direction of the rotor wheel (1) and protrudes towards the respective cutting member (3), that the respective cutting member (3) shows two shanks (3. 3) between which the steering template (5. 1) is located and that the guide (3. 2) extends between the shanks (3. 3).
4. Rotor wheel (1) according to any of claims 13, characterised in that the cutting members (3) comprises sets (3) of mainly leafshaped rasp elements (3. 1).
5. Rotor wheel (1) according to any of claims 13, characterised in that the cutting members comprise Ushaped knifes (2), the ends of which are attached in the rotor wheel (1).
6. Rotor wheel (1) according to claim 5, characterised in that each knifes (2) middle section (2. 3) with the edges (2. 4) after mounting in the rotor wheel (1) shows an inclination towards the radius of the rotor wheel (1) that means that a relief angle (a) is got at the point of attachment when the knife (2) is attached to the tangent of the vehicle tyre.
7. Rotor wheel (1) according to claim 5 or 6, characterised in that each knife (2) is made of a plane sheet billet and shows two mainly rectangular attachment plates (2. 1), each of which provided with a hole (2. 2), and the narrower middle section (2. 3) in the plane position before bending into finished form is arcshaped, whereby this gets the form of a half frustum of a cone when getting bent so that the attachment plates (2. 1) of the knife (2) get located in two relative parallel levels so that the holes (2. 2) coincide and permit a pin to be driven through the attachment plates (2. 1) when mounted in the rotor wheel (1). AMENDED CLAIMS [received by the International Bureau on 31 May 2000 (31. 05. 00) original claims 17 replaced by new claims 15 (2 pages)] 1. A rotor wheel (1) for a cutting device for the removal of tread surfaces from vehicle tires, comprising from its periphery protruding cutting members (2, 3), characterized in that the cutting members (3) are connected with a controllable steering device (5) and are thereby radially slidable between an outer position, in which the cutting members (3) protrude outside of the rotor wheel (1), and an inner position, in which the cutting members (3) are within the periphery of the rotor wheel (l), the cutting device comprises Ushaped knifes (2) having ends that are being attached in the rotor wheel (l), each knife (2) being made of a plane sheet billet and having two mainly rectangular attachment plates (2. 1) connected by a narrower arc shaped middle section (2. 3), each plate (2. 1) having a hole (2. 2) defined therein, the narrower arcshaped middle section (2. 3) being bendable into a finished form of a half frustum of a cone so that the plates (2. 1) are parallel to one another to allow a pin to be driven through the holes (2. 2) when the attachment plates (2. 1) are mounted in the rotor wheel (1).
8. 2 The rotor wheel (1) according to claim 1, characterized in that the steering device (5) is linearly sliding in the longitudinal direction of the rotor wheel (1) and comprises steering templates (5. 1) for one or more cutting members (3) and that respective steering template (5. 1) shows notches (3. 2) for a guide (3. 2) that is arranged on respective cutting member (3).
9. 3 The rotor wheel (1) according to claim 2, characterised in that the each steering template (5 : 1) consists of a plate that extends in the longitudinal direction of the rotor wheel (1) and protrudes towards the respective cutting member (3), that the respective cutting member (3) shows two shanks (3, 3) between which the steering template (5. 1) is located and that the guide (3. 2) extends between the shanks (2. 3).
10. 4 The rotor wheel (1) according to any of claims 13, characterized in that the cutting members (3) comprise sets of mainly leafshaped rasp elements (3. 1).
11. 5 The rotor wheel (1) according to claim 4, characterized in that each knife (2) has a middle section (2. 3) with the edges (2. 4) after mounting in the rotor wheel (1), the section (2. 3) having an inclination towards the radius of the rotor wheel (1) to form a relief angle (a) is at the point of attachment when the knife (2) is attached to a tangent of the vehicle tire.
Description:
CUTTING DEVICE FOR THE REMOVAL OF TREAD SURFACES FROM VEHICLE TYRES TECHNICAL FIELD The present invention relates to a rotor wheel for a cutting device for the removal of tread surfaces from vehicle tyres in order to prepare the tyre for a re- covering of its tread surface. The rotor wheel comprises from its periphery protruding cutting members that are brought in contact with the tread surface of the tyre at the same time as the tyre is brought to rotate around a wheel axle of a rim on which the tyre is mounted.

BACKGROUND TECHNICS A cutting device according to the preamble is described in the Swedish patent application SE 8904097-6 in which also other known cutting devices for vehicle tyres are commented on. The present invention emerged from a further development of the known device which resulted in solutions that offer new and surprising results concerning the tyre work both concerning the cutting capacity and the appearance of the finish-cut tread surface.

DESCRIPTION OF THE INVENTION The present invention relates to a rotor wheel according to the preamble in which the cutting members are connected with a controllable steering device and thereby are radial sliding between an outer position in which the cutting members protrude outside the rotor wheel, and an inner position in which the cutting members are within the periphery of the rotor wheel. The steering device is linearly sliding in the longitudinal direction of the rotor wheel and comprises steering templates for one or more cutting members. Respective steering template shows notches for a guide that is arranged on respective cutting member. Respective steering template consists of a plate that extends in the longitudinal direction of the rotor wheel and protrudes towards the respective cutting

member, that the respective cutting member shows two shanks between which the steering template is located.

The guide extends between the shanks.

The cutting members may comprise sets of mainly leaf-shaped rasp elements or U-shaped knifes, the ends of which are attached in the rotor wheel. It is however favourable to provide the rotor wheel with both sets of rasps and knifes. Each knifes central section with the edge after mounting in the rotor wheel shows an inclination towards the radius of the rotor wheel that means that a relief angle is attained at the point of attachment when the knife is attached to the tangent of the vehicle tyre. Each knife is made of a plane sheet billet and shows two mainly rectangular attachment plates, each of which provided with a hole, and a narrower middle section showing a sharpened edge. The middle section in the plane position before bending into finished form is arc-shaped, whereby this gets the form of a half frustum of a cone when getting bent so that the attachment plates of the knife get located in two relative parallel levels so that the holes coincide and permit a pin to be driven through the attachment plates when mounted in the rotor wheel.

In an alternate embodiment of the rotor wheel according to the invention one may use a knife with a not inclining middle section, known from SE 8904097-6 and mount that with the rectangular attachment plates inclining towards the radius of the rotor wheel, which leads to the middle section with the edge giving a relief angle at the point of attachment when the knife is attached to the tangent of the vehicle tyre as with the knife in the previous case.

It lies within the scope of the invention to combine sets of rasp elements with knifes of different types that each separately or in combinations may be inserting or protruding in the rotor wheel. Thereby in relation to known techniques a great number of optional

choices are attained concerning the cutting capacity and the desired surface appearance of the treated vehicle tyre.

Further features and characteristics concerning the present invention are evident from the description to the drawings below and from the claims.

DESCRIPTION TO THE DRAWINGS The invention is described below as an example of an embodiment in connection with the enclosed drawings.

Figure 1 shows a rotor wheel according to the invention seen in a sectional view and separate from the driving device belonging to it.

Figure 2 shows the rotor wheel according to figure 1 seen in the direction of the axis of rotation and in a cross section along line I-I on figure 1.

Figure 3 shows the rotor wheel according to figure 1 partly in a cross section and mounted on a driving device.

Figure 4 shows one of the knifes that are part of the rotor wheel according to the invention seen in a sectional view and schematically in close contact with a vehicle tyre.

Figure 5 shows a knife according to figure 4 seen in a direction towards its edge.

Figure 6 shows the knife according to figure 4 and 5 surface spread before bending into final form.

The rotor wheel 1 shown in figures 1 and 2 comprises an inner disk 1. 1 that carries four U-shaped knifes 2 and that are equally divided along the periphery of the disk 1. 1, two side disks 1. 2 on each side of the interior disk 1. 1, each of which carries four sets of rasp element 3 and that also are equally divided along the periphery of the respective disks 1. 2 and an interior cap 1. 3 that is in close contact with the inner of the side disks 1. 2 and an exterior cap 1. 4 that is in close contact with the outer of the side disks 1. 2. Each set of

rasps 3 comprises three leaf-shaped rasps 3. 1, schematically shown in the figures, that are arranged in levels perpendicular to the axis of rotation of the rotor wheel. All the disks and caps in the rotor wheel 1 have the same outer diameter. The rotor wheel 1 is in operation mounted on a driving device 4 comprising an axle shaft 4. 1, one end of which is carrying the rotor wheel 1 and the other end of which is provided with a pulley 4. 2 for the connection with a driving motor, not shown in the figures. The axle shaft is intended for horizontal placement, which means that the rotor wheel 1 rotates in a vertical plane during operation. Preferably the tyre to be worked on also is arranged on a horizontal wheel axle and rotating in the opposite direction to the rotor wheel 1.

In the example shown in the figures, the knifes 2 are fixedly mounted and protruding from the inner disk 1. 1. Partly a fixed pin and partly a detachable pin hold each knife. Each set of rasps 3 is retractile or protruding by means of a steering device 5, that is movable in the axis direction of the rotor wheel 1 and that shows four templates 5. 1, each of which arranged in connection with two sets of rasps 3. Each template 5. 1 shows an inner notch 5. 2 and an outer notch 5. 3, in which the guides 3. 2 for the respective set of rasps 3 run. The guides 3. 2 extend between two shanks 3. 3 in the respective set of rasps 3. The steering device 5 comprises also an operating rod, not shown in the figures, that runs inside of the axle shaft 4. 1. When the steering device 5 is retracted towards the driving device 4, the sets of rasps 3 are retracted behind the periphery of the side disks 1. 2 from the position that is shown in figure 3, by forcing the pins to follow the notches 5. 2, 5. 3 that incline towards the centre line of the steering device 5. Each set of rasps 3 then moves in the notches 1. 5 of the side disks 1. 2. When the steering device 5 is protruded from the position shown in figure 3, the inner

set of rasps 3 that are closest to the driving device 4 cam out from the steering device 5 whereas the outer sets of rasps 3 are moved further outward from the exterior side disks 1. 2 in order then to be removed from the rotor wheel 1. The sets of rasps 3 then may be renewed. The three rasps 3. 1 in each set of rasps 3 are renewed by undoing three screws 3. 4, whereby the rasps 3. 1 and the spacers 3. 5 belonging to them may be removed.

Each knife 2 is made of a long strip, plane sheet billet, preferably of a hardenable steel that has been punched to a form shown in figure 6. The billet shows two mainly rectangular attachment plates 2. 1, each of which is provided with a hole 2. 2, and a narrower middle section 2. 3 showing a sharpened edge 2. 4. The middle section 2. 3 in its turn is arc-shaped, whereby this gets the form of a half frustum of a cone when getting bent so that the attachment plates 2. 1 of the knife 2 get located in two relative parallel positions so that the holes 2. 2 coincide and permit a pin to be driven through the attachment plates 2. 1 when mounted in the rotor wheel 1. The ready-bent knife 2 is shown in figures 4 and 5. The sharpening of the edge 2. 4 is then directed inwards towards the bending centre of the knife 2, whereby the knife 2 gets a plane outside. The middle section 2. 3 with the edge 2. 4 shows after mounting in the rotor wheel 1 an inclination towards the radius of the rotor wheel 1 that means that a relief angle a is attained at the point of attachment when the knife 2 is attached to the tangent of the vehicle tyre. Each attachment plate 2. 1 shows also a notch 2. 5 at its inner end that is connected with a corresponding fixed pin when the knife 2 is mounted in the rotor wheel 1 and fixes the knife 2 against rotation.