EP0054547A1 - Dispositif de securite pour un support d'une piece a usiner - Google Patents

Dispositif de securite pour un support d'une piece a usiner

Info

Publication number
EP0054547A1
EP0054547A1 EP81900696A EP81900696A EP0054547A1 EP 0054547 A1 EP0054547 A1 EP 0054547A1 EP 81900696 A EP81900696 A EP 81900696A EP 81900696 A EP81900696 A EP 81900696A EP 0054547 A1 EP0054547 A1 EP 0054547A1
Authority
EP
European Patent Office
Prior art keywords
cam
rod
bore
workpiece holder
workpiece
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.)
Withdrawn
Application number
EP81900696A
Other languages
German (de)
English (en)
Other versions
EP0054547A4 (fr
Inventor
Ronald E. Dennis
Richard W. Kizer
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.)
Caterpillar Inc
Original Assignee
Caterpillar Tractor Co
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 Caterpillar Tractor Co filed Critical Caterpillar Tractor Co
Publication of EP0054547A1 publication Critical patent/EP0054547A1/fr
Publication of EP0054547A4 publication Critical patent/EP0054547A4/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B31/00—Chucks; Expansion mandrels; Adaptations thereof for remote control
    • B23B31/40—Expansion mandrels
    • B23B31/404—Gripping the work or tool by jaws moving radially controlled by conical surfaces
    • B23B31/4046—Details of the jaws
    • 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)
    • B29D30/08—Building tyres
    • B29D30/10—Building tyres on round cores, i.e. the shape of the core is approximately identical with the shape of the completed tyre
    • B29D30/12—Cores

Definitions

  • This invention relates to a workpiece holder and, more particularly, to a safety device for the work ⁇ piece holder to prevent a workpiece from falling from the workpiece holder.
  • a cam engages the inner ends of the slid ⁇ able elements and is movable along the longitudinal axis between a first position ' at which the elements are retracted away from the workpiece and a second position wherein the cam engages the inner surface of the elements to cause outward extension and engagement of the gripping devices with the inner surface of the annular core workpiece.
  • the cam is actuated by a shaft which extends along the longitudinal axis of the support structure. Since the extendible elements and support structure must rotate, this results in a relatively complex structure. It is therefore desirable to simplify construction of the workpiece holder by eliminating the longitudinal cam-actuating shaft.
  • the cores can be very large in diameter (100 inches, for example) and are rotated during manufacture, means must be provided which will ensure that engagement between the workpiece holder and the core is maintained during operation. Loss of grip ⁇ ping force and detachment of the core from the holder can result in equipment damage or injury to the operator. Heretofore, continued engagement has depended upon the integrity of springs or fluid pressure which actuates the cam. It is, therefore, desirable to provide a safety device which will maintain the cam in its extended-hold ⁇ ing position should actuating power to the c m be lost.
  • the present invention is directed to overcom ⁇ ing one or more of tne problems as set forth above.
  • the problems noted above are overcome by providing a rotat- ing workpiece holder which is mounted on a solid canti-
  • the support structure includes a number of engagement arms which are mounted on the support structure perpendicular to the mounting shaft and which extend radially outward to contact the core.
  • the sup- port arms are extended into engagement with the core by a central cam mounted onthe output shaft of a fluid cylinder attached to the support structure opposite the cantilever mounting shaft.
  • the support structure is provided with a spring-operated latch which engages the rear surface of the cam and prevents relative motion between the cam and the support structure.
  • FIG. 1 is an end elevational view of the workpiece holder of the present invention illustrat ⁇ ing the radial support arms and the safety latch de ⁇ vice;
  • Fig. 2 is a sectional elevational view of the workpiece holder taken generally along line 2-2 of Fig. 1;
  • Fig. 3 is an enlarged partial sectional view of the safety latch device taken along line 3-3 of Fig. 1 illustrating the safety latch rod and its spring actuated fluid return cylinder.
  • a workpiece holder generally indicated 10, includes a mounting frame 11 and a support structure 12 having a spindle 14, a hub 16 and an end plate 18.
  • the spindle 14 is hollow and is journaled on spaced apart bearings 20 mount ed on a solid shaft 22 of the mounting frame 11.
  • One bear ing 20 bears against a shoulder 21 on the shaft 22 with the other bearing 20 being held on the end portion of the shaft 22 by a retainer 23.
  • the shaft 22 has a longitudina axis 22 ' and remains fixed during operation.
  • the shaft 22 is supported in cantilever fashion by clamps 24 attached to a support base 26.
  • the spindle 14 is rotated on the shaft 22 by means of a sprocket 27 suitably connected to a source of power, such as an electric motor (not shown) , which may be mounted on the support base 26.
  • a source of power such as an electric motor (not shown) , which may be mounted on the support base 26.
  • the spindle 14 has a flange 25 which is bolted to the hub 16 which, in turn, is secured to the end plate 18.
  • the hub 16 has a cylindrical wall 29 defining a bore 28 concentric with the mounting shaft 22.
  • a plurality of radially oriented spokes 30 are connected to the hub 16 and extend radially outwardly therefrom. Each of the spokes 30 has an outer sleeve 31 with a bore 32 opening into the bore 28 located in the hub 16.
  • Each sleeve 31 of the spokes 30 has a central guide bearing 34 and an end guide bearing 36 secured in the bore 32 of the sleeve 31 to maintain a rod 38 in concentric alignment with said sleeve 31 of the spoke 30.
  • Each of the rods 38 has an arcuate shoe 40 connect ⁇ ed by a pin 39 to the outer distal end portion with each shoe 40 having a resilient pad 42 on the outer surface.
  • a continuous wall 41 is secured to the radial inner surface of the shoe 40 about the connection with the rod 38 and has a pair of longitudinally spaced tabs 43 thereon connected by dual extension springs 46 to tabs 49 on the sleeves 31 of the spokes.
  • the dual extension springs 46 being connected to
  • each of the rods 38 has a pair of rollers 44 rotatably connected by a pin 47 to a projection 45 on the inner proximal end portion of the rod.
  • a circular cam 48 is slidably positioned with ⁇ in the bore 28 in the hub 16 and has a cam surface 50 whicn may be moved into engagement with the rollers 44 at the inner end portion of the rods 38.
  • the cam surface 50 is a surface of revolution in which a constant arc radius is revolved about the longitudinal axis 23 of the shaft 22.
  • the cam 48 is movable within the bore 28 between a firs-t position where the cam 48 is adjacent the hub end plate 18 and an extended position shown in Fig. 2 wherein the cam surface 50 engages the rollers 44 to move the radial rods 38 radially outwardly.
  • Move ⁇ ment of the cam 48 is produced by an output shaft 52 of a fluid cylinder 54 attached to the hub end plate 18. As illustrated in Figs.
  • a safety latch mechanism is attached by a yoke 57 to flanges 59 on two adjacent spokes 30 and rotates with the hub 16.
  • the latcn mechanism 56 in- eludes a locking rod 58 which extends through the hub 16 and which may be extended or retracted by means of a spring-actuated, fluid-return cylinder 60.
  • the extended position of the locking rod 58 is illustrated in Fig. 3 by solid lines and the retracted position by broken lines.
  • the spring-actuated, fluid-return cylinder 60 operates to bias the locking rod 58 to the extended position within the hub bore 28 by means of a constant force applied to the cylinder piston 62 by a compression spring 64 internal of the fluid-return cylinder 60.
  • the piston 62, and the attached locking rod 58 may be withdrawn by applying pressurized fluid to a chamber 66 located in the cylinder 60 above the piston 62.
  • the end extending into the bore 28 is provided with an inclined surface 68 which interacts with the advancing cam surface 50 to move the rod 58 toward its retracted position compressing the springs 64.
  • a pin 70 is provided protruding from one face of the lock ⁇ ing rod. This pin extends into a guide slot 72 formed in the hub 16.
  • the cam 48 is initially located adjacent the end plate 18 which allows the dual spoke springs 46 to retract the rods 38 by forcing the rollers 44 into the hub bore 28.
  • a toroidal body, such as a core,74 may then be maneuvered into position in line with the spoke shoes 40.
  • Pressurized fluid is then applied to the cylinder 54 causing the piston shaft 52 and cam 48 to move toward the shaft 22 and rollers 44.
  • Continued movement of the cam 48 causes the rollers 44 to follow the cam surface 50 thereby extending all the rods 38 simultaneously so that the shoes 40 engage the inner surface of the core 74 and center the core relative to the longitudinal axis 23 of the mounting shaft 22.
  • Extension of the spring 64 causes the locking rod 58 to be interposed between the rear surface 76 of the cam 48 and the plate 18 of the hub 16 thereby preventing the cam 48 from moving out of engagement with the rollers 44.
  • the motor connected to the drive sprocket 27 is activated causing the spindle 14, hub 16, end plate 18 and cam- actuating cylinder 54 to rotate.
  • pressurized fluid is introduced into the cylinder chamber 66 thus counteracting the biasing force of spring 64 and retracting the locking rod 58.
  • the cam 48 may then be withdrawn, either by means of a spring within the cylinder 54 or by applying pressur ⁇ ized fluid to the- opposite surface of the piston with- in the cylinder 54. Movement of the cam 48 to its retracted position adjacent the end plate 18 allows the rollers 44 and rods 38 to move into the bore 28 in response to forces created by the dual spoke springs 46.
  • fluid pressure within the latcn cylinder chamber 66 is relieved thus permitting the spring 64 to extend the locking rod 58 into the bore 28 forward of the cam 48.
  • the structure of the present invention provides a workpiece holder which is simpler in con ⁇ struction than those presently in existence and also one which substantially decreases the possibility of accidental disengagement with the workpiece.-
  • the construction is simplified because the entire rotating structure, which includes the spindle 14, the hub 16, tne end plate 18, the spokes 30 and the cam-actuating cylinder 54 is simply supported in cantilever fashion by a single solid mounting shaft 22.
  • Inclusion of the safety latch mechanism 56 prevents the cam 48 from retracting and disengaging the gripping structure 10 from the workpiece even in the event of interruption of actuating power to the cylinder 54.
  • latch rod 58 has been illustrated extending into the bore 28 adjacent tne rear surface 76 of the cam 48, it would be equally possible and effective to have the rod 58 engage a recess (not shown) in the cam intermediate the cam surface 50 and the rear surface 76.
  • tne workpiece holder of the present invention has been described with respect to a core 74 having a circular inner surface, the structure may be adapted to workpieces having various different inner surface configurations.
  • square workpieces may be accommodated by providing two sets of diametrical ⁇ ly opposed spokes 30 having flat gripping shoes 40 at the end of tne spoke rods 38.
  • workpieces having rectangular or elliptical inner surfaces may be accommodated by providing spokes 30 with rods 38 of different lengths.
  • Fig. 1 illustrates that two latch mechanisms 56 may be pro ⁇ vided opposite one another.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Jigs For Machine Tools (AREA)

Abstract

Le present support d'une piece a usiner elimine le probleme de la perte de la force de prehension ainsi que le probleme du detachement du noyau hors du support. Le support (10) de la piece a usiner possede une pluralite d'elements (38) mobiles radialement vers l'exterieur, s'engageant dans une surface interieure d'une piece a usiner (74) en reponse au deplacement d'une came (48), et comprend au moins un verrou actionne par un ressort (56) qui engage la came (48) et empeche le support (10) de se degager de la piece a usiner (14) pendant le fonctionnement du support de la piece a usiner.
EP19810900696 1980-06-25 1980-06-25 Dispositif de securite pour un support d'une piece a usiner. Withdrawn EP0054547A4 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US1980/000807 WO1982000017A1 (fr) 1980-06-25 1980-06-25 Dispositif de securite pour un support d'une piece a usiner

Publications (2)

Publication Number Publication Date
EP0054547A1 true EP0054547A1 (fr) 1982-06-30
EP0054547A4 EP0054547A4 (fr) 1984-04-24

Family

ID=22154411

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19810900696 Withdrawn EP0054547A4 (fr) 1980-06-25 1980-06-25 Dispositif de securite pour un support d'une piece a usiner.

Country Status (4)

Country Link
EP (1) EP0054547A4 (fr)
JP (1) JPS57500822A (fr)
IT (1) IT1137914B (fr)
WO (1) WO1982000017A1 (fr)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070125497A1 (en) * 2005-12-02 2007-06-07 Lundell Dennis A Heated tire building core assembly and method
US7874822B2 (en) 2007-12-21 2011-01-25 The Goodyear Tire & Rubber Company Tire building core segment manipulator apparatus
US7910043B2 (en) 2007-12-21 2011-03-22 The Goodyear Tire & Rubber Company Tire building and cure station coupling apparatus and method
US8431062B2 (en) 2007-12-21 2013-04-30 The Goodyear Tire & Rubber Company Tire unloading apparatus and method in a curing line
US8127434B2 (en) 2007-12-21 2012-03-06 The Goodyear Tire & Rubber Company Apparatus assembly and disassembly of a tire curing mold
US8113806B2 (en) 2007-12-21 2012-02-14 The Goodyear Tire & Rubber Company Apparatus and method for assembling, disassembling and storing a tire building core
US7802975B2 (en) 2007-12-21 2010-09-28 The Goodyear Tire & Rubber Company Loading apparatus for assembly and disassembly of a tire curing mold
US7854603B2 (en) 2007-12-21 2010-12-21 The Goodyear Tire & Rubber Company Tire building core assembly and disassembly station
US7896632B2 (en) 2007-12-21 2011-03-01 The Goodyear Tire & Rubber Company Apparatus for disassembling a tire building core
US7891962B2 (en) 2007-12-21 2011-02-22 The Goodyear Tire & Rubber Company Tire building core manipulator apparatus
US7785061B2 (en) 2007-12-21 2010-08-31 The Goodyear Tire & Rubber Company Apparatus and method for reorienting a tire and core assembly in a tire manufacturing line
US7887312B2 (en) 2008-11-12 2011-02-15 The Goodyear Tire & Rubber Company Tire building core
CN110280787B (zh) * 2019-07-11 2020-11-24 兰溪瑞鼎机床股份有限公司 用于多边形车削的可对接式自动化双主轴数控机床
CN113020638B (zh) * 2021-03-09 2022-08-09 邯郸钢铁集团有限责任公司 一种实现卧式车床车削万能轧机立辊的装置及方法
CN115582810B (zh) * 2022-11-29 2023-02-24 潍坊顺福昌橡塑有限公司 一种定制轮胎加工用固定夹具

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1447242A (en) * 1921-10-15 1923-03-06 Fritz William Grant Jack
US1624151A (en) * 1925-07-14 1927-04-12 Aladdin Hydraulic Jack Company Hydraulic jack
US2736531A (en) * 1952-10-03 1956-02-28 Prima Ind Ltd Hydraulic lifting jack
US4169585A (en) * 1978-03-03 1979-10-02 Caterpillar Tractor Co. Workpiece holder

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
No relevant documents have been disclosed *
See also references of WO8200017A1 *

Also Published As

Publication number Publication date
EP0054547A4 (fr) 1984-04-24
IT1137914B (it) 1986-09-10
WO1982000017A1 (fr) 1982-01-07
IT8122535A0 (it) 1981-06-24
JPS57500822A (fr) 1982-05-13

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Legal Events

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Designated state(s): DE FR GB

17P Request for examination filed

Effective date: 19820624

RBV Designated contracting states (corrected)

Designated state(s): DE FR GB

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19850813

RIN1 Information on inventor provided before grant (corrected)

Inventor name: DENNIS, RONALD E.

Inventor name: KIZER, RICHARD W.