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WO1988006244A1 - Mecanisme d'emboitement reciproque pour elements telescopiques - Google Patents

Mecanisme d'emboitement reciproque pour elements telescopiques Download PDF

Info

Publication number
WO1988006244A1
WO1988006244A1 PCT/GB1988/000081 GB8800081W WO8806244A1 WO 1988006244 A1 WO1988006244 A1 WO 1988006244A1 GB 8800081 W GB8800081 W GB 8800081W WO 8806244 A1 WO8806244 A1 WO 8806244A1
Authority
WO
WIPO (PCT)
Prior art keywords
outer tubular
tubular member
cap
spring
inter
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/GB1988/000081
Other languages
English (en)
Inventor
Brian George March
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.)
HUME CATHERINE GILLIES
Original Assignee
HUME CATHERINE GILLIES
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 HUME CATHERINE GILLIES filed Critical HUME CATHERINE GILLIES
Publication of WO1988006244A1 publication Critical patent/WO1988006244A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B7/00—Connections of rods or tubes, e.g. of non-circular section, mutually, including resilient connections
    • F16B7/10—Telescoping systems
    • F16B7/14—Telescoping systems locking in intermediate non-discrete positions
    • F16B7/1481—Telescoping systems locking in intermediate non-discrete positions with a gripping helical spring

Definitions

  • This invention relates to an improved inter-locking mechamism for use with telescopic assemblies.
  • a telescopic assembly comprises an outer tubular member within which, in sliding relationship thereto, is provided an inner member which may be tubular or may be a solid cylindrical member such as a rod or shaft.
  • Such telescopic assemblies find many uses, for example in props for clothes lines, extending fishing rods, tent poles, microphone stands, music stands, garden umbrellas as well as in the mining industry and in general engineering. In each of these applications there will generally be a need to provide means of varying the length of the telescopic assembly continuously, rather than in a stepwise manner; and to be able to clamp the members at any desired length so that the assembly is capable of resisting compressive and/or tensive forces.
  • the plunger of the locking device disclosed in UK Paten Specification number 2 171 444A is spring loaded radiall through the third member and into engagement with the hol in the outer tube. This arrangement further complicate assembly of the device, as the hole in the outer tube must be made after assembly of the coil spring and third member on the telescoped tubes, in order to take account of tolerance variations in the diameters of the inner tube and the coil spring.
  • one end of the spring being anchored with respect to the outer tubular member and the other end of the spring extending beyond the end of the outer tubular member; a cap being rotatedly mounted over the end of the outer tubular member and engaging said other end of the spring, so that rotation of the cap in one direction will apply a torsional load to the spring which will unwind the coils of the spring and rotation of the cap in the other direction will tighten the coils of the spring; characterised in that axially opposed formations are provided on the outer tubular member and cap, said formations being engageable to lock the cap rotationally relative to the outer tubular member in a plurality of angular relationships, the spring applying a clamping load to the inner member when the cap and outer tubular member are in at least one of said angular relationships; the opposed formations being resiliently urged axially into engagement in a manner which will permit a limited relative axial movement, so that they may be disengaged to permit relative movement of the cap and outer tubular member.
  • the formation on the outer tubular member and cap will also be engageable to lock the cap relative to the outer tubular member when the clamping load applied by the spring on the inner member has been relaxed sufficiently to -5 -
  • the axially opposed formations will be disengaged and the cap will be rotated from the first to the second position to unwind the spring. Formations may then be re-engaged in the second position so that the inner member may easily be adjusted axially. The formations can then be disengaged and the cap rotated back to the first position when the formations will be re-engaged.
  • the formations will also engage to lock the cap and outer tubular member in other angular relationships to permit further tightening of the spring to allow for stretching or wear.
  • a plurality of angularly spaced axial slots are provided in the circumferential edge of the cap and a pin is provided on the outer tubular member to engage the slots.
  • the cap is mounted for limited axial movement with respect to the outer member so that the slots may be moved into and out of engagement with the pin, the axial resilience of the spring being used to resiliently- load the cap towards the pin, so that the pin engages in the slot.
  • the formation on the cap may be in the form of a pawl formation which is resiliently urged into -6 -
  • Figure 1 is a part sectional view of a telescopic assembly with an interlocking mechanism in accordance with the present invention
  • Figure 2 is an elevation of the cap member of the mechanism illustrated in figure 1;
  • Figure 3 is an elevation of the sleeve member of the mechanism illustrated in figure 1;
  • Figure 4 is a part section view of an alternative mechamism formed in accordance with the present invention.
  • Figure 5 is a sectional view of the mechanism illustrated in figure 4, depicted at right angles to the view shown in figure 4.
  • a telescopic assembly comprises an inner member 2 (which may be a tube or solid shaft) mounted in telescopic relationship within an outer tube 1.
  • a sleeve member 3 is secured about the end of the outer tube 1.
  • a torsion coil spring 5 which is preferably made from flat section material, is interposed between the inner member 2 and outer tube 1.
  • One end 7 of the spring 5 is turned outwardly and passes through the wall of the outer tube 1 and into engagement with a hole 9 in the sleeve member 3.
  • the other end 10 of spring 5 extends beyond the end of outer tube 1, and is turned outwardly in like manner to the end 7.
  • a cap 4 with a stepped axial bore engages over the telescoped inner member 2 and outer tube 1, a reduced diameter portion of the bore slidably engaging the inner member 2, while a larger diameter portion of the bore rotably engages the sleeve member 3 and an intermediate shoulder portion abuts the end of the outer tube 1.
  • the end 10 of spring 5 engages in a hole 11 in the reduced diameter bore portion of cap 4.
  • a plurality of angularly spaced radially extending pins 14 are located through the wall of the larger diameter portion of cap 4 and into engagement with a cylindrical ⁇ groove 15 in the sleeve member 3.
  • the groove 15 is wider than the thickness of the pins 14, so as to permit a limited degree of relative axial movement between cap 4 and sleeve member 244
  • a series of axial slots 12 are provided in the circumferential edge of the larger diameter end of cap 4 and a pin 13 is provided on the sleeve member 3, for engagement of the slots 12.
  • the limited axial movement permitted by engagement of the pin 14 in groove 15 is sufficient to permit the pin 13 to be disengaged from the slots 12, while the axial resilience of spring 5 will urge the cap 4 towards the sleeve member 3 so that the pin 13 will engage in one of the slots 12.
  • the coils of spring 5 clamp tightly about the inner member 2 and pin 13 engages in one of the slots 12 to locate the cap 4 rotationally with respect to the sleeve member 3.
  • the pin 13 is first disengaged from slot 12 by axial movement of the cap 4 away from the sleeve member 3, against the axial load applied by spring 5.
  • the cap 4 may then be rotated to the right (as illustrated in figure 1) and such rotation will unwind the coils of spring 5 thereby increasing their diameter and relaxing the'clamping force on the inner member 2.
  • the pin 13 When relaxation of the clamping force is sufficient to permit axial movement of the inner member 2, the pin 13 may be re-engaged in another of the slots 12, so that the required axial adjustment of the inner member 2 may be made.
  • the clamping force on the inner member 2 may then be reapplied by disengaging pin 13 from the slot 12 engaged thereby and rotating the cap 4 to the left aided by the bias of spring 5, thus tightening the coils of the spring on the inner member 2.
  • the pin 13 may then be re-engaged in one of the slots 12 when a sufficient clamping load has been applied to maintain the desired axial relationship between the inner member 2 and outer tube 1.
  • the slots 12 are arranged so that the degree of tightening of the spring 5 may be varied to accommodate stretching of the spring 5 or variation in the diameter of the inner tube 2 as a result of wear or tolerance variations.
  • the mechanism is assembled by first mounting the spring 5 within the sleeve member 3, so that end 7 engages in hole 9.
  • the cap 4 is then rotatedly mounted on sleeve member 3 with the. end 10 of spring 5 engaged in hole 11.
  • the cap 4 is then axially located with respect to sleeve member 3 by insertion of pins 14 so that they engage in groove 15. If it is desired to permit disassembly of the mechanism, the pins 14 may be in the form of grub screws.
  • a longitudinal slit 8 is cut in the end of tube 1 to accommodate the end 7 of spring 5 so that the preassembled sleeve member 3, spring 5 and cap 4 may be pushed onto the end of outer tube 1 the sleeve member 3 being secured thereto in suitable manner, for example by an interference fit, adhesive, brazing, welding or journalling. The diameter of the spring 5 may then be increased by rotation of cap 4 to the right and the inner member 2 inserted.
  • the pin 13 may be engaged in a slot 12 to maintain the spring in the undamped condition, two hands may thus be used to effect axial adjustment of the inner member 2, this considerably eases operation of the device. Furthermore, engagement of the pin 13 in slots 12 permits locking of the device even if the effective diameter of the spring increases due to repeated unwinding of the coils.
  • a peg could be located on the skirt of the cap 4 and a circumferential ridge with slots 12 may be provided on the sleeve member 3.
  • interengaging formations for example in the form of ratchet teeth, could be provided on both the sleeve member 3 and cap 4.
  • longitudinally extending slots may be provided in the upper edge of groove 15 to be engaged by one or more of the pins 14. While the sleeve member 3 of the above embodimen facilitates assembly of the mechanism and is extremel advantageous where the outer tube 1 has thin walls, it is not essential and, for example, the groove 15, pin 13 and hole 9 may be provided in the wall of the outer tube 1.
  • the peg 13 and slots 12 are replaced by a ratchet mechanism.
  • the sleeve member 3, spring 5 and cap 4 are mounted on the telescoped outer tube 1 and inner member 2 as described above.
  • the pins 14 which locate the cap 4 on sleeve member 3 engage in groove
  • a pawl member 19 extends radially through the cap 4 and into the slot 16. The pawl member 19 is mounted for movement axially of the telescoped elements so that it may be moved into and out of engagement with the ratchet teeth 17.
  • a compression spring 23 is located in a longitudinal closed bore 22 in the skirt of cap 4 and engages with the pawl member 19 to urge it into engagement with the ratchet teeth 17.
  • a guide pin 25 is also located in bore 22, a reduced diameter portion 25 r thereof passing through a hole in pawl member 19 and extending coaxially of spring 23 and into engagement of the reduced diameter portion 24 of bore 22 and serving to retain the pawl member 19 in position.
  • a button knob 20 is provided on the outer end of the pawl member 19, by which it may be pushed upwardly against spring 23, to disengage the pawl member 19 from the ratchet teeth 17.
  • the ratchet mechanism may be arranged to permit rotation back to. the clamped position without disengaging the pawl member 19 from the ratchet teeth 17, under the torsional force applied by the partially unwound spring 5.
  • inter-locking mechanism illustrated in figures 4 and 5 may be assembled in similar manner to that illustrated in figures 1 to 3; the sleeve member 3, spring 5 and cap 4 first being pre-assembled complete with the ratchet mechanism, the sleeve 3 then being secured to the end of the outer tube 1 and the inner member 2 being inserted through the spring 5 after the internal diameter thereof has been increased by rotation of cap 4.
  • the various components of the inter-locking mechanisms of the present invention may be made from suitable plastics materials, for example polyamides (nylon) or polypropylene, or metal.
  • the pawl member 19 of the embodiment illustrated in figures 4 and 5 will however, preferably be made of metal or have a metal wear insert for engagement of the ratchet teeth 17.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mutual Connection Of Rods And Tubes (AREA)

Abstract

Un mécanisme d'emboîtement réciproque, pour assemblage de tubes comprenant un élément tubulaire externe (1) et un élément interne (2), comprend un ressort de torsion spiral (5) qui est placé entre l'élément tubulaire externe (1) et l'élément interne (2) adjacent à l'une des extrémités de l'élément tubulaire externe (1). L'une des extrémités (7) du ressort (5) est fixée par rapport à l'élément tubulaire externe (1) et l'autre extrémité (10) du ressort (5) s'étend au-delà de l'élément tubulaire externe (1) et s'engage dans une collerette (4) qui est montée de façon rotative sur l'extrémité de l'élément tubulaire externe (1), de sorte qu'un mouvement de rotation de la collerette (4) dans une direction servira à appliquer une charge de torsion sur le ressort (5), charge qui sert à dérouler les spires du ressort (5), et un mouvement de rotation de la collerette (4) dans l'autre direction servira à serrer les spires de ressort (5). Des évidements axialement opposés (12, 13) sont ménagés sur l'élément tubulaire externe (1) et sur la collerette (4) et servent de trous d'engagement pour permettre le blocage de la collerette (4) dans le sens de rotation par rapport à l'élément tubulaire externe (1) dans une pluralité de positions angulaires, le ressort (5) appliquant une force de serrage sur l'élément interne (2) lorsque la collerette (4) et l'élément tubulaire externe (1) se trouvent au moins dans l'une de ces positions angulaires. Les évidements opposés (12, 13) sont sollicités élastiquement dans le sens axial de façon à produire un engagement qui permettra un mouvement axial limité relatif et de façon à produire un désengagement qui permettra le mouvement relatif de la collerette (4) et de l'élément tubulaire externe (1), les spires du ressort (5) pouvant alors se dérouler pour permettre un mouvement relatif de l'élément interne (2) et de l'élément externe (1) ou se serrer pour bloquer l'élément interne (2) l'élément tubulaire externe (1) dans la position axiale appropriée.
PCT/GB1988/000081 1987-02-17 1988-02-11 Mecanisme d'emboitement reciproque pour elements telescopiques Ceased WO1988006244A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8703671 1987-02-17
GB878703671A GB8703671D0 (en) 1987-02-17 1987-02-17 Inter-locking mechanism

Publications (1)

Publication Number Publication Date
WO1988006244A1 true WO1988006244A1 (fr) 1988-08-25

Family

ID=10612448

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1988/000081 Ceased WO1988006244A1 (fr) 1987-02-17 1988-02-11 Mecanisme d'emboitement reciproque pour elements telescopiques

Country Status (3)

Country Link
EP (1) EP0346359A1 (fr)
GB (1) GB8703671D0 (fr)
WO (1) WO1988006244A1 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1989006756A1 (fr) * 1988-01-19 1989-07-27 Vinten Broadcast Limited Dispositif de blocage
GB2315409A (en) * 1996-07-24 1998-02-04 Rover Group Vehicle headrest adjustment
WO1998010196A1 (fr) * 1996-09-05 1998-03-12 Olde Heuvel Bernadus Johannes Ensemble pour couplage mecanique
FR2824115A1 (fr) * 2001-04-27 2002-10-31 Cera Systeme de coulissement et de blocage d'une tige lisse au moyen d'un ressort, notamment pour siege de vehicule automobile
WO2009091266A3 (fr) * 2008-01-17 2009-09-11 Puku Limited Dispositif de raccord
US8464391B2 (en) 2007-04-03 2013-06-18 Diversey, Inc. Mop head fixation device and method
USD719712S1 (en) 2012-09-07 2014-12-16 Diversey, Inc. Floor maintenance tool
WO2018009941A1 (fr) * 2016-07-08 2018-01-11 Raphael Schlanger Ensemble de tige de selle réglable en hauteur

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3230595A (en) * 1963-06-04 1966-01-25 Kedem Abraham Rod clamping device
US3856253A (en) * 1973-05-01 1974-12-24 American Trading & Prod Adjustable stand
GB2171444A (en) * 1984-11-21 1986-08-28 Kenneth Johnstone Hume Clamp for telescopic tubes

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3230595A (en) * 1963-06-04 1966-01-25 Kedem Abraham Rod clamping device
US3856253A (en) * 1973-05-01 1974-12-24 American Trading & Prod Adjustable stand
GB2171444A (en) * 1984-11-21 1986-08-28 Kenneth Johnstone Hume Clamp for telescopic tubes

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1989006756A1 (fr) * 1988-01-19 1989-07-27 Vinten Broadcast Limited Dispositif de blocage
GB2315409A (en) * 1996-07-24 1998-02-04 Rover Group Vehicle headrest adjustment
WO1998010196A1 (fr) * 1996-09-05 1998-03-12 Olde Heuvel Bernadus Johannes Ensemble pour couplage mecanique
FR2824115A1 (fr) * 2001-04-27 2002-10-31 Cera Systeme de coulissement et de blocage d'une tige lisse au moyen d'un ressort, notamment pour siege de vehicule automobile
US8464391B2 (en) 2007-04-03 2013-06-18 Diversey, Inc. Mop head fixation device and method
US8959699B2 (en) 2007-04-03 2015-02-24 Diversey, Inc. Mop head fixation device and method
WO2009091266A3 (fr) * 2008-01-17 2009-09-11 Puku Limited Dispositif de raccord
US10413791B2 (en) 2008-01-17 2019-09-17 Puku Limited Connection device
USD719712S1 (en) 2012-09-07 2014-12-16 Diversey, Inc. Floor maintenance tool
WO2018009941A1 (fr) * 2016-07-08 2018-01-11 Raphael Schlanger Ensemble de tige de selle réglable en hauteur
GB2566636A (en) * 2016-07-08 2019-03-20 Schlanger Raphael Height adjustable seatpost assembly
GB2566636B (en) * 2016-07-08 2021-10-13 Schlanger Raphael Height adjustable seatpost assembly

Also Published As

Publication number Publication date
GB8703671D0 (en) 1987-03-25
EP0346359A1 (fr) 1989-12-20

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