US2508675A - Apparatus for removing air bags from retreaded tires - Google Patents

Apparatus for removing air bags from retreaded tires Download PDF

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Publication number
US2508675A
US2508675A US13927A US1392748A US2508675A US 2508675 A US2508675 A US 2508675A US 13927 A US13927 A US 13927A US 1392748 A US1392748 A US 1392748A US 2508675 A US2508675 A US 2508675A
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United States
Prior art keywords
tyre
tread
support
elements
levers
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.)
Expired - Lifetime
Application number
US13927A
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English (en)
Inventor
Kent Jan Herbert Farquharson
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.)
AUTO TYRE SERVICES Ltd
Original Assignee
AUTO TYRE SERVICES Ltd
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 AUTO TYRE SERVICES Ltd filed Critical AUTO TYRE SERVICES Ltd
Application granted granted Critical
Publication of US2508675A publication Critical patent/US2508675A/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00—Producing pneumatic or solid tyres or parts thereof
    • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/0601—Vulcanising tyres; Vulcanising presses for tyres
    • B29D30/0649—Devices for removing vulcanising cores, i.e. bladders, from the tyres; Opening the press in combination herewith

Definitions

  • Thisinvention ha'sfor example a simple' metho-d anii'apparatus for manipulating 'thetyre cover soiasto facilitate the withdrawal o'fthe pressure "bag from the tyre cover on completion-oi vulcani'zation, this operation being known inthe trade as debagging.
  • a device for applying pressure 'to the tyrein accordance with this invention may comprise a plurality of members arranged in a ring' and capable of displacement radially in relationtoa coinmon centre by which pr'essurecan"be'applieii to thty're when placed insidethering.
  • the elements :"vvhi'ch may consist of plates having a base por- *tion may be directly mounted on thet'alile.
  • the lever mechanism may consist cfa'seri'es of hell crank levers fulcrumed about centres ariang'edon'a-circIe below the level of the table '-stnt l havingone arm projecting above the plane 'o'f'the table for connection to links, whose inner or free ends are fitted with't'yreenga'gin'g plates.
  • the plates "which may be' curved in section are preferably hingedly attached to the ends of the links in order to accommodate themselves to the treadtof the-atyre.
  • Theather and :lowermost arm of :eachmbell cranklever is :extended ,inwardiy connection to :anactuator common-to rthe several hell crank levers so "that 1 an upward or downward movement of 'theactuator 2 will "rock the bell .tcrank levers about their iulcrums and-'so-rmove thezplates inwardly or outwardly.
  • the actuator may the :10 controlled by :means :of :screwgear 'ortfor :ex-
  • the iinvention is :illustrateddn the accompanyingz drawins's fin which' fii'gni is a diagrammatic plan :view ct-2a tyre expanding apparatuswin-zaccordance with one 'embodimenti'oi the invention.
  • Fig. 2 is a part sectional elevation: of tithe vapparatr m :of Fig. 11 on an enlarged scale showin .'.the
  • Fin-:3 is aseparate view in elevation "of a-fitread for 'pressure applyingmember as embodied :irrthe mechanism of Fig. 2.
  • Figs. 4" and 5 are se'ctionalyi'ewson the line 4 4" 'of Fig.”- S anti showing- :a tyre lifting 'device -r'espectively in its inoperative and op'era- 'tive positions.
  • the apparatus comprises a support in *the "form-or a" tahil'e l onwhich a *tyre' to be expanded or *dba'gged' positioned prior to*en"gagement"-by -'a plurality "of itread-iengaging elements 2; which 'are movable radially in relation to the centre o'f' talile -*l to engage and apply pressure "tothejtre'ad of the tyre sufii'eient *to-cause separati'on of the wallsthereo'f.
  • Each of the lemetits 2 Zis displaceable by linkage comprising a *b'll crank lever indicated “gen- *erally "at” 6, I one arm “I “of-which, 'being the short arm, is connected through 1a linlr tto lugs attachedto the backofthe'arcuateplatewby means of a pivot film-l0.
  • the pin I'O is 'removab1yflxed in' -positlon's'o that the elements l'can-if-necessary -be substituted for othermf smaller or larger size "as forexample when' a machine is converted from handling small to g'iant size tyres.
  • the purpose of the finger device 25 is to lift the tyre T from off the surface 5 of the table before it has made contact with the back wall 3 As already explained and as shown in Fig. 4 the finger 25 will first engage the tyre causing the same to lift without applying squeezing pressure at the tread until it is clear of the table and is in engagement with the arcuate face 3 as in Fig. 5: in this position contyre, the bell cranks being mounted on a part of the machine frame.
  • the tyre may be supported by the elements-2'- erated by a hydraulic ram having a piston l5 -movable in a cylinder it supported by a part H of the machine framing.
  • the framing l1 comprises a central opening l8 for insertion of a sleeve l9 supporting the cylinder I6 and attached to which is a thrust plate 20.
  • Plate. is formed with an extension 2
  • the actuator [4 consists of a plate having a number of lugs 23 to which are hingedly attached each oilinks 24 coupling the actuator 14 to the bell crank arms l3.
  • the apparatus incorporates meansfor producing a relative displacement between the tyre and its supportprior to engagement of the tread elements with the tyre, the purpose being to provide sufiicient clearance between the tyre and support for the wall of the tyre to expand.
  • each of the tread engaging elements 2 is preferably fitted with a lifting device comprising .
  • a finger element 25 mounted to pivot about a horizontal axis on the base 4 of the arcuate plate.
  • the finger 25 is preferably arch shaped as shown providing a tyre containing face 26, about which the tread section of the tyre will roll, when subjected to the leys ns adi u 9 neerfi as it s rc d acktinued movement of 3 will squeeze the tread, sufilcient space being available between the tyre and-the surface 5 to permit the lower bead to move downwards at the same time as the upper bead moves upwards as .the tyre is compressed.
  • the plates will automatically accommodate themselves to the tread of the tyre and for the same reason there may be provided a certain amount of play in the linkage connections in a plane parallel to the surface of the table for the samepurpose.
  • the points of connection of the lever arms to the links may be adjustable.
  • the central links 24 may be provided with additional pivot holes 24.
  • Movement of the elements 2 may be obtained in a number of ways and in place of lever mechanisms, it may be convenient to employ cam and roller mechanisms. Similarly we may substitute screw operating gear for displacing the actuator I4 upwardly and downwardly. Positive movement of the actuator may be unidirectional in a direction to compress the tyre, the inherent resiliency of the tyre being relied on to restore the parts to their open position with elements dispersed radially.
  • Some form of quick release mechanism may be fitted which as applied to a. hydraulically actuated ram may consist of a pressure release valve to release the fluid pressure behind the piston.
  • one of the plates may be arranged to have a lead in relation to the others, so that in operation'it receives a greater displacement than the remainder.
  • a support adapted to receive a tyre
  • a series of tread engaging elements freely slidable on the support so as to be capable of movement into and out of engagement with the tread of said tyre
  • a series of lever members fulcrumed at points spaced around the perimeter of'the tyre
  • a common actuating means connected respectively to said lever members for rocking said lever members about their fulcrums, and links respectively connecting said lever members to the tread engaging elements.
  • a support for the tyre a series of tread engaging elements including a base portion and an upstanding rim portion adapted for engagement with the tread of a tyre, said base portion being slidable on the support, a common actuating means and a series of two armed levers spaced circumferentially in relation to the tyre, one arm of each of said levers being adjustably connected to the rim portion of the tread engaging element and the other to the actuating means.
  • Apparatus for handling tyres comprising a support for the tyre, a series of tread engaging elements slidable over the surface of said support so as to be capable of movement into and out of engagement with the tread of the tyre, other support means for the tyre positioned on the support for lifting the tyre bodily in relation thereto, and a common actuating means for bringing about a displacement of the tread engaging elements and of said other support means so that before the tread engaging elements contact the tread, said other support means becomes operative to hold the tyre spaced from its support.
  • a support adapted to receive a tyre, a series of tread engaging elements freely slidable on the support so as to be capable of movement into and out of engagement with the tread of the tyre, a series of two armed levers, means mounting said levers on said support at points circumferentially spaced in relation to the tyre, links respectively connecting one arm of each of said levers to a tread engaging element, a single actuating means adjustably connected to the other arms of said levers, and means operable by said actuating means for causing relative displacement between the tyre and said support prior to the application of pressure on the tyre through said tread engaging elements so as to provide for freedom of movement of the tyre wall adjacent said support.
  • Apparatus as claimed in claim 5 in which the means for causing relative displacement between the tyre and the support comprises a plurality of members adapted to exert a prying action on the tyre.
  • Apparatus as claimed in claim 5 in which the means for causing relative displacement between the tyre and the support comprises a plurality of members respectively carried by the tread engaging elements and being adapted to exert a prying action on the tyre.
  • the means for causing relative displacement between the tyre and the support comprises a plurality of finger pieces pivoted respectively to the tread engaging elements at the bases thereof and being swingable about their respective pivots to move the tyre away from said support before the tyre is engaged by said tread engaging elements.
  • apparatus for handling tyres the combination of a support adapted to receive a tyre, a series of tread engaging elements guided by the support for movements towards and from the tyre for engagement with the tread of said tyre, a common actuating means, and mechanism positively connecting said elements to said actuating means, said mechanism including a series of brackets attached to said support, a series of short and long armed levers fulcrumed respectively on said brackets, links respectively connecting the short arms of said levers to the tread engaging elements, and means connecting the long arms of said levers to said actuating means.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
US13927A 1947-03-20 1948-03-09 Apparatus for removing air bags from retreaded tires Expired - Lifetime US2508675A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB7743/47A GB625772A (en) 1947-03-20 1947-03-20 Improvements in and relating to retreading of tyre covers

Publications (1)

Publication Number Publication Date
US2508675A true US2508675A (en) 1950-05-23

Family

ID=9838859

Family Applications (1)

Application Number Title Priority Date Filing Date
US13927A Expired - Lifetime US2508675A (en) 1947-03-20 1948-03-09 Apparatus for removing air bags from retreaded tires

Country Status (3)

Country Link
US (1) US2508675A (en, 2012)
FR (1) FR963482A (en, 2012)
GB (1) GB625772A (en, 2012)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1738504A (en) * 1925-09-12 1929-12-03 Firestone Tire & Rubber Co Apparatus for use in removing pressure bags from pneumatic-tire casings

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1738504A (en) * 1925-09-12 1929-12-03 Firestone Tire & Rubber Co Apparatus for use in removing pressure bags from pneumatic-tire casings

Also Published As

Publication number Publication date
GB625772A (en) 1949-07-04
FR963482A (en, 2012) 1950-07-11

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