WO2016135663A1 - Dispositif d'autocentrage pour machines à changer les pneus - Google Patents

Dispositif d'autocentrage pour machines à changer les pneus Download PDF

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Publication number
WO2016135663A1
WO2016135663A1 PCT/IB2016/051030 IB2016051030W WO2016135663A1 WO 2016135663 A1 WO2016135663 A1 WO 2016135663A1 IB 2016051030 W IB2016051030 W IB 2016051030W WO 2016135663 A1 WO2016135663 A1 WO 2016135663A1
Authority
WO
WIPO (PCT)
Prior art keywords
turntable
self
spikes
centering device
wheels
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/IB2016/051030
Other languages
English (en)
Inventor
Gino Ferrari
Franco Maioli
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to EP16718004.1A priority Critical patent/EP3261859A1/fr
Publication of WO2016135663A1 publication Critical patent/WO2016135663A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C25/00—Apparatus or tools adapted for mounting, removing or inspecting tyres
    • B60C25/01—Apparatus or tools adapted for mounting, removing or inspecting tyres for removing tyres from or mounting tyres on wheels
    • B60C25/05—Machines
    • B60C25/053—Support of wheel parts during machine operation
    • B60C25/0539—Support of wheel parts during machine operation radially fixing the rim, e.g. with gripping claws

Definitions

  • the invention relates to a self-centering device for tire-changing machines, which is generally used for temporarily fixing the wheels to the work turntable of such machines, without damaging their rims.
  • Tire-changing machines are known to be equipped with a base having a tool-supporting column extending upwards therefrom, and a substantially horizontal turntable having members for temporary fixation of a wheel for a tire repairer is to work thereupon.
  • This turntable is known in the art as a “self-centering” turntable and the fixation members consist of four spikes or jaws, which are slidingly mounted to the turntable to slide thereon along paths that converge toward the center in the active holding step and diverge therefrom in the passive releasing step.
  • each jaw is slidingly guided in a respective straight slot formed in the turntable; the four slots generally form a cross of slots having two straight, perpendicular diametrical branches.
  • the jaws are simultaneously actuated by means of pneumatic actuators, which are arranged directly under the turntable, and may be connected through special cam profiles, also accommodated under the turntable, between the underside of the latter and the actuators, and simultaneously drive all the jaws together, in both active and passive directions.
  • each jaw comprises a prismatic body which defines a base designed to directly slide on the surface of the turntable and, opposite thereto, a hook that extends upwards from the base and forms a projecting tooth oriented toward the center of the turntable.
  • this tooth fits between the edge of the wheel rims and the beads of the tires mounted to the rims, and in the passive steps it slips out of them.
  • each claw also has a downwardly-extending stem or pin which extends through the slot by which it is guided and has its lower end directly hinged to the actuators or engaged in a respective cam profile, to receive therefrom, in either case, the motion that ensures its movements along the slot in both active and passive steps.
  • a first drawback is that, as the base of each jaw slides in direct contact with the surface of the turntable, it generates therewith a considerable contact friction force.
  • This contact friction progressively abrades both the base of each jaw, and the surface of the turntable, and generates a metal powder that, with the passage time and repeated sliding movements, will cover mainly the areas of the turntable upon which the jaws slide, but also the members that drive them, thereby progressively affecting smooth sliding motion and progressively increasing the amount of force required therefor.
  • a second drawback is that systematic generation of metal powder due to friction between the bases of the four jaws and the surface of the turntable maintains a substantially constant layer of dirt which fouls the wheels that lay on and are fixed to the turntable and anything that might contact the turntable during operation.
  • a third drawback is that the presence of this dirt requires periodic cleaning of tire-changing machines and the areas around them, which involves some down time of the machines.
  • a fourth drawback is that the teeth of the spikes, especially in the holding step, during which they fit between the edges of the rim and the beads of the tire mounted thereupon, often violently hit the edges of the rims and damage them.
  • One object of the invention is to improve the prior art.
  • Another object of the invention is to provide a self-centering device for tire-changing machines, which can prevent the generation of metal powders due to friction.
  • a further object of the invention is to provide a self-entering device for tire-changing machines that ensures integrity of the wheels to be fixed thereupon.
  • Yet another object is to provide a self-centering device for tire-changing machines that has a very simple and hence highly cost-effective structure.
  • the invention relates to a self-centering device for tire- changing machines as defined in the features of claim 1 .
  • FIG. 1 is a general perspective view of a tire-changing machine of the invention
  • FIG. 2 is a perspective view of a detail of the tire-changing machine of Figure 1 in a slightly enlarged scale;
  • FIG. 3 is a phantom lateral view of a spike or jaw of the invention in a greatly enlarged scale
  • FIG. 4 is a top view of the spike or jaw as shown in Figure 3;
  • FIG. 5 is a rear view of the spike or jaw as shown in Figure 3;
  • FIG. 6 is an enlarged broken-away view of a spike or jaw in an operating position
  • FIG. 7 is a schematic broken-away view of a box-like rail mounted to the underside of a turntable of the tire-changing machine of Figure 1 ;
  • FIG. 8 is a schematic enlarged bottom view of means for simultaneous actuation of the spikes or jaws.
  • numeral 1 designates a tire- changing machine which comprises a base 2 with a column 3 vertically extending upwards therefrom.
  • the column 3 supports a connector 4 at its top end, for a horizontal operating arm 5 which extends in cantilever fashion and has an articulated joint 6 at its free end, for supporting a smaller column 7 that has a connector at its bottom end for a working tool.
  • a substantially horizontal surface 9 is defined on the base 2, with a motorized turntable 10, known as “self-centering turntable” 10, mounted thereto, upon which vehicle wheels (not shown) are designed to be supported and locked when mounting and removing tires to and from respective rims.
  • a motorized turntable 10 known as "self-centering turntable” 10
  • spikes 1 1 also known as jaws, are mounted to the turntable 10 and simultaneously slide between two positions, namely an inactive position, in which they release the rims, and an active position in which they engage the edges of the rims and lock them to the turntable 10.
  • the four spikes 1 1 are actuated by special simultaneous actuation means, generally referenced 12 and described in greater detail below.
  • each of the four spikes 1 1 moves from the exterior of the turntable toward the center 10 and vice versa, by sliding along a slot 14 formed in and through the turntable 10.
  • the four slots 13 are in radial cross arrangement, as shown in Figures 1 and 2.
  • a box-like rail 14 is mounted level with each slot 13, by being connected to the underside 10B of the turntable 10, opposite to the top working surface
  • such rail having a longitudinal top opening 15 and an opposite longitudinal lower opening 16, both longitudinally aligned to the respective slot 13 and parallel thereto.
  • each of the spikes 1 1 is shown to comprise a body 17 having a substantially transversely narrow and longitudinally elongate shape.
  • the body 17 forms a base 18 and an engagement tooth 19, which extends upwards and is designed, in the active position, to engage with an edge of a wheel rim, by fitting between the latter and the bead of the tire that is possibly mounted thereto, thereby fixing the rim to the turntable 10.
  • the base 18 extends at its bottom, i.e. opposite to the tooth 19, with a shoe 20, which is rigidly joined to the base 18 and to the body 17 and supports two pairs of freely rotating first wheels 21 , whose axes of rotation "R" are parallel to the base 18 and perpendicular to the longitudinal axis "Z" thereof.
  • first wheels 21 are designed to slide while being guided within their respective rail 14, and to hold the base 18 slightly raised, typically by a few millimeters, from the working surface 10A of the turntable 10, such that no contact exists between the latter and the bottom face of the base 18, referenced 18A.
  • the shoe 20 appears to be formed with a compartment 22, open at two sides, in which two successive, freely rotating second wheels 23 are accommodated, which have axes of rotation "Y" parallel to each other and perpendicular to the base 18.
  • These two second wheels 18 have such diameters as to allow their respective outer rolling surfaces to project out of the compartment 22, such that they may roll on the mutually facing inner edges of their respective slots 13, referenced 13A, while still guiding the bodies 17 as each spike slides between the two active and inactive positions.
  • a pin 24 extends from the bottom surface of the shoe 20, referenced 20A, in the downward direction i.e. opposite to the base 18, and has a freely- rotating third wheel keyed thereto, whose purpose is to couple with the simultaneous actuation means 12 for receiving motion therefrom, to drive each spike 1 1 .
  • each third wheel 25 is engaged in a slot-shaped cam profile 26 in a plate 27, which typically has a circular shape or a rounded perimeter, and is mounted under the turntable 10 and coaxial therewith, and may be actuated by a pair of actuators 28, typically of pneumatic type, or by other equivalent members known to the skilled person, which have their respective stems 29 hinged at their free ends to the plate 27 and have the cases 30 in which the respective pistons slide, fixed to the base 2 of the tire changing machine 1 .
  • Each cam profile (or slot) 26 has one end 26A oriented in the centripetal direction of the plate 27 and an opposite end 26B oriented in the centrifugal direction.
  • the position of the two actuators relative to the plate 27 is such that a couple of forces is created, which rotates it either clockwise or counterclockwise.
  • the self-centering device of the invention may have, if needed, raised lifting ribs or bars 31 arranged on the working surface 10A of the turntable 10, advantageously alternated to the slots 13 and radially directed like the latter.
  • These ribs or bars 31 may either be formed directly during fabrication of the turntable 10 and hence be stable, or be removably applied (or even simply laid) thereon at a later time to be used when needed.
  • the operation of the self-centering device is substantially similar to that of a known self-centering device of a prior art tire-changing machine, except that the spikes 1 1 slide between the two active and inactive positions with minimized friction between the respective bases 18 and the working surface 10A.
  • the direction of the spikes 1 1 is maintained by the engagement between the second wheels 23 that slide on the inner faces 13A of the slots 13, which also generates minimized friction.
  • the simultaneous alternate actuation of the spikes 1 1 , into the two active and inactive positions is obtained by rotating the plate 27 in the two opposite counterclockwise or clockwise directions; these rotations transfer motion to the spikes 1 1 through the engagement between all the third wheels 25 and their respective cam profiles 26, i.e. the slots that define the cam profiles 26; here again the friction generated between the rolling surfaces of the third wheels 23 and the edges of the cam profiles 26 is minimized.
  • ribs 31 affords optimized positioning of wheel rims relative to the working surface 10A, namely in a slightly raised position with respect to the latter, thereby avoiding damages to the rims caused by the spikes 1 1 when sliding toward or away from them, as well as damages caused by direct contact between the rims and the working surface 10A.
  • the invention has been found to fulfill the intended objects.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Tyre Moulding (AREA)

Abstract

La présente invention concerne un dispositif d'autocentrage destiné à des machines (1) à changer les pneus comprenant : une plaque tournante (10) permettant de supporter et de fixer des roues ; une pluralité de pointes (11), également connues sous le nom de mâchoires, comportant un corps (17) qui définit une base (18) et une dent (19) de mise en prise opposée et qui sont agencées de manière coulissante sur une surface de travail (10A) de ladite plaque tournante (10) entre une position active de maintien de la jante et une position inactive de libération de la jante ; un moyen (12) permettant un actionnement simultané desdites pointes (11) de ladite position active à ladite position inactive, et inversement ; un moyen de guidage (13, 14) formé dans ladite plaque tournante (10) de sorte à guider lesdites pointes (11) ; un moyen coulissant (21, 23) permettant d'entraîner un glissement à faible frottement desdites pointes (11) interposés entre lesdites pointes (11) et ladite plaque tournante (10).
PCT/IB2016/051030 2015-02-26 2016-02-25 Dispositif d'autocentrage pour machines à changer les pneus Ceased WO2016135663A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP16718004.1A EP3261859A1 (fr) 2015-02-26 2016-02-25 Dispositif d'autocentrage pour machines à changer les pneus

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMO2015A00040 2015-02-26
ITMO20150040 2015-02-26

Publications (1)

Publication Number Publication Date
WO2016135663A1 true WO2016135663A1 (fr) 2016-09-01

Family

ID=52815147

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2016/051030 Ceased WO2016135663A1 (fr) 2015-02-26 2016-02-25 Dispositif d'autocentrage pour machines à changer les pneus

Country Status (2)

Country Link
EP (1) EP3261859A1 (fr)
WO (1) WO2016135663A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108944287A (zh) * 2018-07-04 2018-12-07 重庆交通大学 轮胎扒胎装置
GB2579861A (en) * 2018-12-18 2020-07-08 Top One Machinery Co Ltd Wheel rim chuck with soft jaws

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4267867A (en) * 1978-09-01 1981-05-19 Francis Du Quesne Device for fixing a wheel to an apparatus for fitting and removing tires
DE9204888U1 (de) * 1991-03-15 1992-06-04 Corghi S.p.A., Correggio Emilia, Reggio Emilia Selbstzentrierende Gruppe
EP1683658A2 (fr) * 2005-01-19 2006-07-26 Gino Ferrari Dispositif de serrage
CN201165182Y (zh) * 2008-01-18 2008-12-17 科星（中山）汽车设备有限公司 用于轮胎拆装机的卡爪座装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4267867A (en) * 1978-09-01 1981-05-19 Francis Du Quesne Device for fixing a wheel to an apparatus for fitting and removing tires
DE9204888U1 (de) * 1991-03-15 1992-06-04 Corghi S.p.A., Correggio Emilia, Reggio Emilia Selbstzentrierende Gruppe
EP1683658A2 (fr) * 2005-01-19 2006-07-26 Gino Ferrari Dispositif de serrage
CN201165182Y (zh) * 2008-01-18 2008-12-17 科星（中山）汽车设备有限公司 用于轮胎拆装机的卡爪座装置

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108944287A (zh) * 2018-07-04 2018-12-07 重庆交通大学 轮胎扒胎装置
GB2579861A (en) * 2018-12-18 2020-07-08 Top One Machinery Co Ltd Wheel rim chuck with soft jaws

Also Published As

Publication number Publication date
EP3261859A1 (fr) 2018-01-03

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