US3807618A - Guide means for supporting a rod-shaped body having a nominally circular cross-section - Google Patents

Guide means for supporting a rod-shaped body having a nominally circular cross-section Download PDF

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Publication number
US3807618A
US3807618A US00378110A US37811073A US3807618A US 3807618 A US3807618 A US 3807618A US 00378110 A US00378110 A US 00378110A US 37811073 A US37811073 A US 37811073A US 3807618 A US3807618 A US 3807618A
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US
United States
Prior art keywords
sleeve
internal
tongues
rod
shaped body
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
US00378110A
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English (en)
Inventor
C Agerup
H Gundtoft
T Nielsen
O Olsen
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Atomenergikommissionen
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Atomenergikommissionen
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.)
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Publication date
Application filed by Atomenergikommissionen filed Critical Atomenergikommissionen
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Publication of US3807618A publication Critical patent/US3807618A/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C29/00—Bearings for parts moving only linearly
    • F16C29/12—Arrangements for adjusting play
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H57/00—Guides for filamentary materials; Supports therefor
    • B65H57/12—Tubes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C25/00—Bearings for exclusively rotary movement adjustable for wear or play
    • F16C25/02—Sliding-contact bearings
    • F16C25/04—Sliding-contact bearings self-adjusting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C29/00—Bearings for parts moving only linearly
    • F16C29/02—Sliding-contact bearings

Definitions

  • the device comprises an outer sleeve and an inner sleeve, which is axially movable with a tight fit in the outer sleeve and is formed at one end with an internal cylindrical surface for engaging the rod-shaped body.
  • the cylindrical surface is provided by a plurality of tongues formed by incisionsin the end portion of the sleeve.
  • the inner and outer sleeves have cooperating inclined contact surfaces, which preferably are conical with different vertical angles, and spring means are provided between the sleeves for effecting a resilient engagement between the inclined contact surfaces of the'sleeves and between the internal surfaces of the tongues and the rod-shaped body.
  • the number of tongues is preferably an odd multiple of three.
  • the present invention relates to guide means for supporting a rod-shaped body having a nominally circular cross-section and which is advanced through the guide means in its longitudinal direction, especially but not exclusively for use in an apparatus for nondestructively testing tubes.
  • guide means of the type mentioned shall provide an extremely accurate centering of the supported body relative to a fixed centre line, for example the axis of a measuring head rotating around the body, irrespective of variations in the dimensions of the body including its cross-sectional shape within a given tolerance range. It is desirable moreover, that one guide means can be used for supporting bodies having different nominal diameters and that the movement of the body through the guide means takes place with low friction and without any significant risk of damage to its surface.
  • a device for guiding and supporting a rod-shaped body having a nominally circular cross-section, and which is advanced in its longitudinal direction through the device which device comprises a stationary outer sleeve and an inner sleeve axially displacable within said outer sleeve, which inner and outer sleeves over a part of their length have opposed cylindrical mating surfaces engaging with a tight sliding fit,
  • said inner sleeve having at one end thereof an internal, cylindrical or substantially cylindrical contact surface for engagement with the outer surface of said rod-shaped body and an external contact surface inclined with respect to the longitudinal axis of the device, said inner sleeve being formed at said end with a plurality of tongues separated by axially extending slits,
  • said outer sleeve having an inclined internal contact surface for engagement with said inclined external contact surface on said inner sleeve
  • a device having a slotted inner sleeve as defined above is known in a somewhat similar construction from the so-called collets used in machine tools.
  • a collet it is a question of solving a substantially different technical task, viz. to'obtain the maximum gripping force on a workpiece for the transmission of substantial torques whereas, according to the present invention, it is desirable to achieve an optimum of centering accuracy with. as small gripping forces as possible to ensure the freedom of axial movement of the rod-shaped body.
  • the axial and radial movements of the slotted sleeve in a collet are positively controlled and are considerably greater than in the device according to the invention since they have to ensure that the workpiece is alternately completely released and clamped immovably.
  • the contact surfaces of the sleeves may be conical and the vertex angle of the internal sleeve may be smaller than that of the contact surface of the external sleeve. This feature effectively counteracts tendencies towards jamming between the two sleeves in the contact surfaces, which would render the advancing of the supported body difficult in the'case of local dimensional variations.
  • the mating surfaces between the external and the internal sleeve may extend from the endremote from the slotted end of the internal sleeve and, at least, forward to the base or root end of the tongues.
  • the number of tongues on the internal sleeve is odd and in particular it may be an odd multiple of three, by preference nine.
  • the crosssectionalshape is often slightly triangular due to the mode of manufacture and such a cross-section will become optimally centered when the number of tongues is divisible by three. It has been-found, however, that also oval cross-sections are centered with avery high degree of accuracy by employing an odd number of tongues. Generally speaking, the centering accuracy is improved the greater the number of tongues is, however, for practical reasons it will rarely be expedient to employ more than nine tongues-also because the improvement in accuracy which it is possible to achieve by employing a still greater number is relatively minor.
  • the slotted end of the internal sleeve may be located at the trailing end of the guide means, as seen in the direction of movement. This feature reduces the risk that the axial friction force between the body and the guiding surface of the tongues pull the internal sleeve more strongly towards the contact surface on the external sleeve which would lead to a self-intensifying increase of the gripping force and, hence, of the friction.
  • FIG. 1 is a longitudinal section through an arrangement for non-destructive testing of tubes, wherein the tube is guided and supported in two devices constructed in conformity with a preferred embodiment of the present invention
  • FIG. 2 is a detailed view on a larger scale of a portion of the tube and the internal sleeve of one of the guide means, partly in section along line Illl in FIG. 3, and
  • FIG. 3 is a view of the sleeve illustrated in FIG. 2 seen from the right-hand end.
  • the measuring arrangement depicted in a purely schematical manner in FIG. 1 comprises a stationary housing composed of two axially spaced housing portions 1 arranged inmirror-image relationship to one another, and a rotating, annular measuring head 2 located between and supported by the housing portions.
  • the measuring head 2 may be provided with measuring apparatus (not shown) for measuring, monitoring or otherwise testing a tube -3 shown with dotted lines and being pulled continuously or intermittently through the housing 1,1 past the measuring apparatus. Examples of measuring apparatus in question are described in the co-pending Danish patent application No. 5086/70, for measuring the external and internal diameters and the wall-thickness of the tube and/or for detecting possible defects in the tube.
  • Tube 3 which is advanced in the direction of arrow 4 in FIG. 1, is supported by two guide means 5 embodying the present invention and mounted at opposite ends of housing 1,1.
  • Each guide means comprises an outer or external sleeve 6'which is immovably secured in the housing portion 1 in question and which, at one end,
  • FIGS. 2 and 3 have a conical, internal contact surface 7.
  • An inner or internal sleeve 8, which is shown in greater detail in FIGS. 2 and 3 is, throughout the greater part of its length, externally cylindrical with a diameter that makes a tight sliding fit in a bore 9 in the external sleeve 6 behind its conical surface 7.
  • sleeve 8 is formed with an external conical contact surface 10 which, by preference, is somewhat more slender than surface 7.
  • the vertical or apex angle of surface 7 may be approximately 24, while the apex angle of surface 10 is approximately 18.
  • sleeve 8 is slotted by means of a number of incisions 12, totalling nine in the embodiment shown, which extend parallel to the axis of the sleeve and are angularly equispaced, whereby a corresponding number of longitudinal, resilient tongues 13 are formed between the incisions.
  • the foremost end of each tongue is internally formed as a portion of a supporting surface 14 which in the undeformed state of the tongue is circular-cylindrical and the diameter of which corresponds to the nominal diameter of tube 3. Behind surface 14, the internal cavity of the sleeve is radially enlarged so that tube 3 passes unimpededly through this part of the sleeve, in-
  • the solid part of the wall of sleeve 8 behind the bottom of incisions 12 has a tight sliding fit in bore'9 of the external sleeve 6. This ensures an accurate centering of sleeve 8 relative to sleeve 6 and, hence, relative to housing 1 and to the rotating measuring head 2.
  • the evenly. distributed contact surfaces 14 on tongues 13 ensure a correspond ingly accurate centering of tube 3.
  • the resilient inner sleeve 8 may be fabricated from a suitable plastics material having a relatively low friction coefficient, for example, polytetrafluoroethylene.
  • a device for guiding and supporting a rod-shaped body having a nominally circular cross-section and which is advanced in its longitudinal direction through the device said device comprising a stationary outer sleeve and an inner sleeve axially displaceable within said outer sleeve, which inner and outer sleeves over a part of their length have opposed cylindrical mating surfaces engaging with a tight sliding fit,
  • said inner sleeve having at one end thereof an internal, cylindrical or substantially cylindrical contact surface for engagement with the outer surface of said rod-shaped body and an external contact surface inclined with respect to the longitudinal axis of the device,
  • said'inner sleeve being formed at said end with a plurality of tongues separated by axially extending slits
  • said outer sleeve having an inclined internal contact surface for engagement with said inclined external contact surface on said inner sleeve, and spring means between said inner and outer sleeves for urging said inclined external and internal contact surfaces on said sleeves into mutual axial engagement.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bearings For Parts Moving Linearly (AREA)
  • Examining Or Testing Airtightness (AREA)
  • Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
  • Clamps And Clips (AREA)
  • Mutual Connection Of Rods And Tubes (AREA)
  • Monitoring And Testing Of Nuclear Reactors (AREA)
  • Fishing Rods (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Pallets (AREA)
  • Springs (AREA)
US00378110A 1972-07-18 1973-07-11 Guide means for supporting a rod-shaped body having a nominally circular cross-section Expired - Lifetime US3807618A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DK357172AA DK127755B (da) 1972-07-18 1972-07-18 Føring til understøtning af et stangformet legeme med nominelt cirkulært tværsnit.

Publications (1)

Publication Number Publication Date
US3807618A true US3807618A (en) 1974-04-30

Family

ID=8124400

Family Applications (1)

Application Number Title Priority Date Filing Date
US00378110A Expired - Lifetime US3807618A (en) 1972-07-18 1973-07-11 Guide means for supporting a rod-shaped body having a nominally circular cross-section

Country Status (8)

Country Link
US (1) US3807618A (cg-RX-API-DMAC7.html)
JP (1) JPS5435514B2 (cg-RX-API-DMAC7.html)
CA (1) CA978350A (cg-RX-API-DMAC7.html)
DE (1) DE2335745C3 (cg-RX-API-DMAC7.html)
DK (1) DK127755B (cg-RX-API-DMAC7.html)
FR (1) FR2193439A5 (cg-RX-API-DMAC7.html)
GB (1) GB1420465A (cg-RX-API-DMAC7.html)
NO (1) NO135268C (cg-RX-API-DMAC7.html)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2778903A1 (fr) * 1998-05-25 1999-11-26 Foerster Inst Dr Friedrich Dispositif de guidage d'objets oblongs et appareil de controle faisant application de ce dispositif
US6536614B2 (en) * 2001-07-16 2003-03-25 Chih-Yu Hsia Shelves with modular panels and accessories
CN103420219A (zh) * 2013-08-21 2013-12-04 张家港市霞飞塑业有限公司 一种软管的输送机构
CN110345839A (zh) * 2018-04-02 2019-10-18 矢崎总业株式会社 销直径检查工具和销直径检查方法

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2439580C3 (de) * 1974-08-17 1982-09-23 Achenbach Buschhütten GmbH, 5910 Kreuztal Meßeinrichtung zur Ermittlung des Abstandes der Stützwalzeneinbaustücke eines Quarto-Walzgerüstes
DE2654753C3 (de) * 1976-12-03 1993-11-18 Licentia Gmbh Schaltstangenanordnung für einen Hochspannungs-Leistungsschalter
SE443628B (sv) * 1983-11-09 1986-03-03 Atlas Copco Ab Tryckfluidumdriven kolv och cylinder anordning
DE3522011A1 (de) * 1985-06-20 1987-01-02 Wabco Westinghouse Steuerung Lagerbuchse
DE4007471A1 (de) * 1990-03-09 1991-09-19 Foerster Inst Dr Friedrich Fuehrungsduese zum fuehren von langgestrecktem werkmaterial
FR2674918B1 (fr) * 1991-04-05 1995-05-19 Ardepa Palier coulissant.
AU4302793A (en) * 1993-05-28 1994-12-20 Ampex Canada Inc. Bearing assembly having provision for adjusting radial stability
GB9401855D0 (en) * 1994-02-01 1994-03-30 Middleton Charles W Linear roller bearing
GB201408622D0 (en) 2014-05-15 2014-07-02 Oxford Space Systems Ltd Linear bearing
CN106523525B (zh) * 2016-12-23 2019-08-30 深圳市汉匠自动化科技有限公司 一种无级锁紧机构

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2778903A1 (fr) * 1998-05-25 1999-11-26 Foerster Inst Dr Friedrich Dispositif de guidage d'objets oblongs et appareil de controle faisant application de ce dispositif
DE19822986B4 (de) * 1998-05-25 2004-04-15 Institut Dr. Friedrich Förster Prüfgerätebau GmbH & Co. KG Führungseinrichtung
US6536614B2 (en) * 2001-07-16 2003-03-25 Chih-Yu Hsia Shelves with modular panels and accessories
CN103420219A (zh) * 2013-08-21 2013-12-04 张家港市霞飞塑业有限公司 一种软管的输送机构
CN103420219B (zh) * 2013-08-21 2016-03-02 张家港市霞飞塑业有限公司 一种软管的输送机构
CN110345839A (zh) * 2018-04-02 2019-10-18 矢崎总业株式会社 销直径检查工具和销直径检查方法

Also Published As

Publication number Publication date
NO135268C (cg-RX-API-DMAC7.html) 1977-03-09
GB1420465A (en) 1976-01-07
JPS5435514B2 (cg-RX-API-DMAC7.html) 1979-11-02
NO135268B (cg-RX-API-DMAC7.html) 1976-11-29
FR2193439A5 (cg-RX-API-DMAC7.html) 1974-02-15
JPS4993085A (cg-RX-API-DMAC7.html) 1974-09-04
DK127755B (da) 1973-12-31
DE2335745B2 (de) 1978-09-28
DE2335745C3 (de) 1979-05-23
CA978350A (en) 1975-11-25
DE2335745A1 (de) 1974-01-31

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