EP3984701A1 - Abziehvorrichtung - Google Patents

Abziehvorrichtung Download PDF

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Publication number
EP3984701A1
EP3984701A1 EP21203357.5A EP21203357A EP3984701A1 EP 3984701 A1 EP3984701 A1 EP 3984701A1 EP 21203357 A EP21203357 A EP 21203357A EP 3984701 A1 EP3984701 A1 EP 3984701A1
Authority
EP
European Patent Office
Prior art keywords
claws
collar
synchronizer
puller according
slots
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.)
Pending
Application number
EP21203357.5A
Other languages
English (en)
French (fr)
Inventor
Yi-Fang Chen
Wei-li CHEN
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
Priority claimed from DE102020127522.6A external-priority patent/DE102020127522B3/de
Priority claimed from DE202020105974.2U external-priority patent/DE202020105974U1/de
Application filed by Individual filed Critical Individual
Publication of EP3984701A1 publication Critical patent/EP3984701A1/de
Pending legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
    • B25B27/02—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for connecting objects by press fit or detaching same
    • B25B27/023—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for connecting objects by press fit or detaching same using screws

Definitions

  • the present invention relates to a puller and, more particularly, to a simple, efficient, safe and easy-to-use puller.
  • a conventional puller includes two claws pivotally connected to a collar.
  • An abutting element such as threaded rod or a hydraulic device is inserted in the collar.
  • the claws are engaged with the annular element.
  • the abutting element is operated to abut an end thereof against an end of the axle.
  • the operation of the abutting element is continued to move the collar and the claws away from the axle.
  • the annular element is detached from the axle.
  • the claws are not interconnected so that each of the claws is engaged with or disengaged from a portion of the annular element independent of the other claw. Attention has to be paid to the engagement of each of the claws with the corresponding portion of the annular element because the former might be disengaged from the latter accidentally. Such accidental disengagement is hazardous for a user of the puller.
  • the threaded rod provides a long stroke for moving the annular element.
  • the rotation of the threaded rod relative to the collar to extend the threaded rod from the collar to abut against the axle is inefficient.
  • the extension of a piston rod from the hydraulic device is fast.
  • the stroke of the extension of the piston rod is short.
  • the operation of detaching the annular element from the axle often includes several phases.
  • the puller alone is used to move the annular element along the axle for a stroke.
  • the claws are disengaged from the annular element before an extensive element is connected to the piston rod.
  • the puller is used to move the annular element along the axle for another stroke.
  • the following phase is repeated until the annular element is detached from the axle.
  • the present invention is therefore intended to obviate or at least alleviate the problems encountered in the prior art.
  • the puller includes a collar, claws, a synchronizer and an abutting assembly.
  • the collar includes a space, a screw hole in communication with the space, slots in communication with the space, and pivotal connectors located corresponding to the slots.
  • the claws are pivotally connected to the pivotal connectors.
  • Each of the claws includes a protuberance movable in a corresponding one of the slots.
  • the synchronizer is movably inserted in the space of the collar.
  • the synchronizer includes a receiving portion for receiving the protuberances.
  • the abutting assembly is inserted in the screw hole of the collar.
  • the puller includes a collar, claws, a synchronizer, an abutting assembly and an extensive element.
  • the collar includes a space, a screw hole in communication with the space, slots in communication with the space, and pivotal connectors located corresponding to the slots.
  • the claws are pivotally connected to the pivotal connectors.
  • Each of the claws includes a protuberance movable in a corresponding one of the slots.
  • the synchronizer includes a receiving portion for receiving the protuberances.
  • the synchronizer is movable in the collar between an opening position and a closing position. In the opening position, the synchronizer opens the claws by the protuberances. In the closing position, the synchronizer closes the claws by the protuberances.
  • the synchronizer includes a receiving portion for receiving the protuberances.
  • the abutting assembly is extensible from the collar.
  • a collar 10 two claws 20, a synchronizer 30, an abutting assembly 40 and a restraint assembly 45 in accordance with a first embodiment of the present invention.
  • the claws 20 are pivotally connected to the collar 10.
  • the synchronizer 30 is used to synchronize the pivoting of the claws 20 to claw an annular element 80 to be detached from an axle 85 ( FIG. 6 ).
  • the abutting assembly 40 is inserted in and engaged with the collar 10.
  • the abutting assembly 40 is movable relative to the collar 10 to detach the annular element 80 from the axle 85 ( FIGS. 6 and 7 ).
  • the collar 10 is formed with a space 11, a screw hole 12 in communication with the space 11, and two slots 18 in communication with the space 11.
  • the combination of the space 11 with the screw hole 12 axially extends throughout the collar 10.
  • the abutting assembly 40 is inserted in the screw hole 12.
  • the collar 10 further includes two opposite pivotal connectors 15.
  • Each of the pivotal connectors 15 includes two lugs 16 each of which includes an aperture 17.
  • Each of the slots 18 is located between the lugs 16 of a corresponding one of the pivotal connectors 15.
  • Each of the slots 18 includes a closing limit 181 and an opening limit 182.
  • the limits 181 and 182 of each of the slots 18 are used to limit the range of the pivoting of a corresponding one of the claws 20.
  • the puller further includes two discs 19 and 34.
  • the disc 19 includes several screw holes 191.
  • the disc 34 includes orifices 341 corresponding to the screw holes 191.
  • Each of the claws 20 includes a barb 21 at a lower end, a protuberance 25 at an upper end, and a pivotally connective portion 22 in the vicinity of the barb 21.
  • the barb 21 of each of the claws 20 is used for engagement with a portion of the annular element 80 ( FIGS. 6 and 7 ).
  • the pivotally connective portion 22 of each of the claws 20 is formed with an aperture 23.
  • each of the claws 20 is movably inserted in a corresponding one of the slots 18 so that the upper end of each of the claws 20 is located between the lugs 16 of a corresponding one of the pivotal connectors 15.
  • a pivot 24 is fitted in the apertures 17 of the lugs 16 of each of the pivotal connectors 15 and the aperture 23 of a corresponding one of the claws 20.
  • the pivotally connective portion 22 of each of the claws 20 is pivotally connected to a corresponding one of the pivotal connectors 15 of the collar 10.
  • Each of the pivots 24 can be a pin, a rivet or a combination of a threaded bolt with a nut.
  • the protuberances 25 of the claws 20 are movably inserted in the slots 18 of the collar 10.
  • the protuberances 25 are moved in the slots 18 as the claws 20 are pivoted relative to the collar 10.
  • Each of the protuberances 25 includes a closing limit 251 on an upper face and an opening limit 252 on a lower face.
  • the closing limits 251 of the protuberances 25 are in contact with the closing limits 181 of the slots 18 to limit the closing of the claws 20.
  • the closing limits 252 of the protuberances 25 are in contact with the opening limit 182 of the slots 18 to limit the opening of the claws 20.
  • the limits 181 and 182 of each of the slots 18 extend away from each other as they extend to an internal face of the collar 10 from an external face of the collar to enlarge the angle of the pivoting of a corresponding one of the claws 20.
  • the synchronizer 30 is preferably a collar formed with an internal flange 31 at an upper end and a receiving portion 32 at a lower end.
  • the receiving portion 32 of the synchronizer 30 includes several bores 33.
  • the bores 33 can be made in an external face of the synchronizer 30 only or throughout the synchronizer 30 in a radial direction.
  • the synchronizer 30 In assembly, the synchronizer 30 is movably inserted in the space 11 of the collar 10. A spring 35 is compressed between the synchronizer 30 and the collar 10 so that the spring 35 tends move the synchronizer 30 away from the collar 10.
  • the spring 35 includes an end in contact with the internal flange 31 of the synchronizer 30 and an internal flange of the collar 10 formed around the screw hole 12. The spring 35 is hidden in the synchronizer 30 in consideration of aesthetics of the puller and safety of a user.
  • each of the claws 20 is inserted in a corresponding one of the bores 33 of the synchronizer 30.
  • the synchronizer 30 is moved relative to the collar 10 to synchronously pivot the claws 20 relative to the collar 10.
  • the protuberances 25 are made with an adequate length and strength.
  • the disc 19 is attached to the collar 10 so that they are not movable relative to each other. To this end, the disc 19 is formed with a cavity (not numbered) in which an upper end of the collar 10 is fitted.
  • the disc 34 is attached to the synchronizer 30 so that they are not movable relative to each other. To this end, the disc 34 is formed with a cavity (not numbered) in which the upper end of the synchronizer 30 is fitted.
  • a screw 38 is inserted in each of the screw holes 191 of the disc 19 through a corresponding one of the orifices 341 of the disc 34.
  • the discs 19 and 34 are movably connected to each other.
  • the screw holes 191 can be replaced with orifices like the orifices 341 in an alternative embodiment.
  • a nut (not shown) is used with each of the screws 38 in such an alternative embodiment.
  • the abutting assembly 40 includes a hydraulic or pneumatic device and a threaded rod 43.
  • a hydraulic device such as PH202 made by SPX is preferred.
  • the hydraulic device includes a cylinder 41 and a piston tube 42.
  • the cylinder 41 extends axially throughout the discs 19 and 34, the synchronizer 30, the spring 35 and the collar 10.
  • the cylinder 41 includes a threaded section 410 inserted in the screw hole 12.
  • the piston tube 42 is extensible from the cylinder 41 as hydraulic pressure in the cylinder 41 is increased by a manual, electric or pneumatic pump.
  • a ring 420 is inserted in a lower open end (not numbered) of the piston tube 42.
  • the threaded rod 43 extends throughout the ring 420 and the piston tube 42 axially.
  • the threaded rod 43 is rotatable and hence translatable relative to the piston tube 42.
  • a thread can be made on an internal face of the piston tube 42.
  • a sleeve (not numbered) is fitted in the piston tube 42 so that the former is not rotatable relative to the latter.
  • a lower end of the sleeve is abutted against an internal flange (not numbered) of the piston tube 42.
  • An internal face of the sleeve is formed with a thread (not numbered) engaged with the threaded rod 43.
  • the threaded rod 43 can be replaced with a second hydraulic device in another embodiment.
  • the second hydraulic device includes the piston tube 42 as a cylinder.
  • the second hydraulic device further includes a piston rod extensible from the piston tube 42 when hydraulic pressure in the piston tube 42 is increased.
  • the restraint assembly 45 includes a cap 46 and a restraint 47.
  • the cap 46 covers the cylinder 41.
  • a lower section of the cap 46 is inserted in the synchronizer 30 so that a lower end of the cap 46 is abutted against an annular flange (not numbered) of the synchronizer 30.
  • the restraint 47 is a nut engaged with the threaded rod 43.
  • the spring 35 keeps the synchronizer 30 in an upper position relative to the collar 10.
  • the synchronizer 30 keeps the protuberances 25 of the claws 20 in an upper position relative to the collar 10 so that the claws 20 are pivoted toward the abutting assembly 40 about the pivots 24, i.e., closed.
  • the closing limit 251 of the protuberance 25 of each of the claws 20 is in contact with the closing limit181 of each of the slots 18 of the collar 10 so that the angle between each of the claws 20 and the abutting assembly 40 is at a smallest value.
  • the protuberances 25 keep a lower section of the synchronizer 30 in the collar 10, thereby keeping the spring 35 in position.
  • the restraint 47 abuts against the cap 46.
  • the cap 46 in turn abuts stops the synchronizer 30.
  • the synchronizer 30 in turn keeps the spring 35 in the collar 10.
  • the claws 25 are opened at first.
  • the hydraulic pressure in the cylinder 41 is increased to extend the piston tube 42 and the threaded rod 43 from the cylinder 41, i.e., downwards as shown in FIG. 5 .
  • the restraint 47 which is attached to the threaded rod 43, moves the cap 46 downwards.
  • the cap 46 abuts against the internal flange of the synchronizer 30 to move the synchronizer 30 downwards relative to the collar 10.
  • the protuberances 25 of the claws 20 are moved toward the opening limits 182 of the slots 18 of the collar 10, thereby pivoting the claws 25 away from the abutting assembly 40, i.e., opened.
  • the spring 35 is compressed as the synchronizer 30 is moved toward the collar 10.
  • the disc 34 could be moved toward the disc 19 to move the synchronizer 30 toward the collar 10.
  • the claws 20 are located around the annular element 85.
  • the hydraulic pressure in the cylinder 41 is reduced retreat the piston tube 42 and the threaded rod 43 into the cylinder 41.
  • the restraint 47 releases the cap 46.
  • the cap 46 releases the synchronizer 30 to allow the spring 35 to move the synchronizer 30 away from the collar 10.
  • the protuberances 25 of the claws 20 are moved toward the closing limits 181 of the slots 18 of the collar 10.
  • the claws 20 are pivoted toward the abutting assembly 40, i.e., closed, so that the barbs 21 of the claws 20 are engaged with lower portions of the annular element 80.
  • a tip 431 of the threaded rod 43 is located above an upper end of the axle 85.
  • the restraint 47 is moved upwards along the threaded rod 43, i.e., away from the cap 46 so that the restraint 47 cannot move the cap 46 downwards when the threaded rod 43 is rotated and hence extended from the piston tube 42.
  • the tip 431 of the threaded rod 43 is abutted against the upper end of the axle 85.
  • the hydraulic pressure in the cylinder 41 is increased to extend the piston tube 42 and the threaded rod 43 from the cylinder 41 to move the collar 10 and the claws 20 away from the axle 85.
  • the claws 20 move the annular element 80 upwards relative to the axle 85 because the barbs 21 of the claws 20 are engaged with the lower portions of the annular element 80. Eventually, the annular element 80 is detached from the axle 85.
  • the puller can be used with a crane (not shown) so that the crane can be used to lift the annular element 80 after the annular element 80 is detached from the axle 85.
  • a crane not shown
  • two rings (not numbered) are attached to the disc 34, and the rings are hooked by two hooks (not numbered) tied to two chains (not numbered) which are in turn tied to the crane.
  • the disc 34 is formed with at least one arched slot (not numbered), thereby forming a lug-like portion (not numbered) along the arched slot, and the lug-like portion is hooked by a hook tied to a chain which is in turn tied to the crane.
  • each of the claws 20 can be replaced with a claw 20A of another size.
  • the claw 20A is otherwise identical to the claws 20.
  • each of the pivots 24 is detached from a corresponding one of the pivotal connectors 15 and the pivotally connective portions 22 of a corresponding one of the claws 20 to allow a corresponding one of the claws 20 to be detached from a corresponding one of the pivotal connectors 15 of the collar 10.
  • the claws 20A are connected to the pivotal connectors 15 of the collar 10 by the pivots 24.
  • each of the slots 18 is kept in communication with a corresponding one of the bores 33 to facilitate the insertion of the protuberance 25 of a corresponding one of the claws 20A (or the claws 20) into each of the slots 18 via a corresponding one of the bores 33.
  • the abutting assembly 40 is used with an end element 430, two extensive elements 60 and a sleeve 64 for example when the abutting assembly 40 is not long enough to detach the annular element 80 from the axle 85.
  • the end element 430 includes a tip 431 at a lower end and an insert 432 at an upper end.
  • Each of the extensive elements 60 includes an insert 61 at an upper end and a cavity 62 in a lower end.
  • An upper open end of the sleeve 64 receives the tip 431 of the threaded rod 43, and a lower open end of the sleeve 64 receives the insert 61 of an upper one of the extensive elements 60.
  • the insert 61 of a lower one of the extensive elements 60 is inserted in the cavity 62 of the upper extensive element 60, and the cavity 62 of the lower extensive element 60 receives the insert 432 of the end element 430.
  • the tip 431 of the end element 430 is used for abutment against the upper end of the axle 85 in operation.
  • the insert 61 of each of the extensive elements 60 is formed with an annular groove (not numbered) for receiving an elastic ring (not shown) or a bore (not shown) for receiving a spring-biased ball (not shown).
  • the elastic ring or spring-biased ball is used to keep the insert 61 in the corresponding open end or cavity 62.
  • the insert 432 of the end element 430 is formed with an annular groove (not numbered) for receiving an elastic ring (not shown) or a bore (not shown) for receiving a spring-biased ball (not shown) to keep the insert 432 of the end element 430 in the cavity 62 of the lower extensive element 60.
  • FIG. 10 shown is a puller according to a second embodiment of the present invention.
  • the second embodiment is identical to the first embodiment except for including three claws 20 connected to three pivotal connectors 15 of the claws 20.
  • the synchronizer 30, which is movable relative to the collar 10, is used to synchronize the pivoting of the claws 20, which are pivotally connected to the collar 10, toward or away from the annular element 80.
  • the puller is simple in structure.
  • the protuberance 25 of the claws 20 are inserted in the slots 18 of the collar 10 and some of the bores 33 of the synchronizer 30, thereby keeping the lower section of the synchronizer 30 in the collar 10 in operation.
  • the screws 38 keep the discs 19 and 34 to each other to keep the lower section of the synchronizer 30 in the collar 10, without having to use any other element. This also simplifies the structure of the puller.
  • the easy replacement of any of the claws 20 with a claw 20A of another size saves the user from purchasing and keeping pullers of various sizes which would otherwise be expensive and inconvenient.
  • the diverging gap between the limits 181 and 182 of each of the slots 18 allows a large range of the pivoting of a corresponding one of the claws 20.
  • the limits 181 and 182 of the slots 18 keep the pivoting of the claws 20 to a reasonably large range.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mechanical Operated Clutches (AREA)
EP21203357.5A 2020-10-19 2021-10-19 Abziehvorrichtung Pending EP3984701A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102020127522.6A DE102020127522B3 (de) 2020-10-19 2020-10-19 Kraftbetriebener hydraulischer Abzieher
DE202020105974.2U DE202020105974U1 (de) 2020-10-19 2020-10-19 Kraftbetriebener hydraulischer Abzieher

Publications (1)

Publication Number Publication Date
EP3984701A1 true EP3984701A1 (de) 2022-04-20

Family

ID=78528622

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21203357.5A Pending EP3984701A1 (de) 2020-10-19 2021-10-19 Abziehvorrichtung

Country Status (1)

Country Link
EP (1) EP3984701A1 (de)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU1430252A1 (ru) * 1987-03-06 1988-10-15 Сибирский Филиал Центрального Опытно-Конструкторского Технологического Бюро Государственного Всесоюзного Научно-Исследовательского Института Ремонта И Эксплуатации Машинно-Тракторного Парка Съемник
US5419027A (en) * 1992-06-17 1995-05-30 Power Team Div. Of Spx Corporation Puller
US20080222867A1 (en) * 2006-05-31 2008-09-18 Robarge Enterprises, Inc. Valve nut removal and replacement system
EP2241406A2 (de) * 2009-04-17 2010-10-20 Yu-Chen Chen Tragbares hydraulisches Ziehgerät
DE102014107066A1 (de) * 2014-05-19 2015-11-19 Poul Chang Metal Industry Co., Ltd. Abzieher
GB2576583A (en) * 2018-10-29 2020-02-26 Bo Chen Hung Co Ltd Detachment puller

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU1430252A1 (ru) * 1987-03-06 1988-10-15 Сибирский Филиал Центрального Опытно-Конструкторского Технологического Бюро Государственного Всесоюзного Научно-Исследовательского Института Ремонта И Эксплуатации Машинно-Тракторного Парка Съемник
US5419027A (en) * 1992-06-17 1995-05-30 Power Team Div. Of Spx Corporation Puller
US20080222867A1 (en) * 2006-05-31 2008-09-18 Robarge Enterprises, Inc. Valve nut removal and replacement system
EP2241406A2 (de) * 2009-04-17 2010-10-20 Yu-Chen Chen Tragbares hydraulisches Ziehgerät
DE102014107066A1 (de) * 2014-05-19 2015-11-19 Poul Chang Metal Industry Co., Ltd. Abzieher
GB2576583A (en) * 2018-10-29 2020-02-26 Bo Chen Hung Co Ltd Detachment puller

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