WO2005019591A1 - Dispositif de support ajustable - Google Patents

Dispositif de support ajustable Download PDF

Info

Publication number
WO2005019591A1
WO2005019591A1 PCT/AU2004/001128 AU2004001128W WO2005019591A1 WO 2005019591 A1 WO2005019591 A1 WO 2005019591A1 AU 2004001128 W AU2004001128 W AU 2004001128W WO 2005019591 A1 WO2005019591 A1 WO 2005019591A1
Authority
WO
WIPO (PCT)
Prior art keywords
mounting rod
support
locking means
engagement
mounting
Prior art date
Application number
PCT/AU2004/001128
Other languages
English (en)
Inventor
Michael Stokes
Original Assignee
Michael Stokes
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 AU2003904579A external-priority patent/AU2003904579A0/en
Application filed by Michael Stokes filed Critical Michael Stokes
Publication of WO2005019591A1 publication Critical patent/WO2005019591A1/fr

Links

Classifications

    • AHUMAN NECESSITIES
    • A47FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47BTABLES; DESKS; OFFICE FURNITURE; CABINETS; DRAWERS; GENERAL DETAILS OF FURNITURE
    • A47B91/00Feet for furniture in general
    • A47B91/02Adjustable feet
    • AHUMAN NECESSITIES
    • A47FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47BTABLES; DESKS; OFFICE FURNITURE; CABINETS; DRAWERS; GENERAL DETAILS OF FURNITURE
    • A47B9/00Tables with tops of variable height
    • A47B9/04Tables with tops of variable height with vertical spindle
    • AHUMAN NECESSITIES
    • A47FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47BTABLES; DESKS; OFFICE FURNITURE; CABINETS; DRAWERS; GENERAL DETAILS OF FURNITURE
    • A47B9/00Tables with tops of variable height
    • A47B9/06Tables with tops of variable height with vertical toothed rack
    • EFIXED CONSTRUCTIONS
    • E06DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06CLADDERS
    • E06C7/00Component parts, supporting parts, or accessories
    • E06C7/42Ladder feet; Supports therefor
    • E06C7/44Means for mounting ladders on uneven ground

Definitions

  • This invention relates to a support leg which is adjustable and used for levelling a ladder, scaffolding, table or the like structure and in particular to a device which enables ladders to be erected on uneven ground or even stairwells.
  • One particular application for the invention relates to ladders and tables and for convenience the invention will be described with reference to that particular application without intending to limit the scope of the invention.
  • a ladder When using a ladder, it is often necessary to rest the feet of the ladder on uneven ground. Unless the feet of the ladder are levelled, the ladder will be inclined to the vertical and consequently unstable and potentially dangerous for the user.
  • the simplest and most commonly used method of levelling the feet of a ladder is to place a solid object with an even surface, such as a brick under the lowermost foot of the ladder. While this method can be effective, it is often difficult to find objects of the correct thickness to satisfactorily level the feet of the ladder to minimise the deviation of the ladder from the vertical.
  • the support object is generally a combination of objects of varying thickness and shape which happen to be available at the time. Since the support made from a combination of objects are not held together, it represents a potentially unstable foundation. The problem is compounded with tables when erecting a table on uneven ground, the slightest difference in levels among the four legs resulting in the table not sitting evenly and rocking as the weight distribution on the table is shifted. This is often alleviated by placing objects of appropriate thickness under one or more of the legs to provide a level foundation for the legs.
  • the invention provides a device for levelling a structure having two or more support legs, said device including at least one elongate member received within a support leg and extending longitudinally beyond the end of the support leg for contacting a support surface, a mounting rod extending longitudinally from the elongate member to slidingly engage a fixture within the structure and releasable locking means for securing the position of the mounting rod relative to the support leg of the structure, the releasable locking means including an engagement unit slidable within a mounting support of the structure, the engagement unit being provided with an oversized aperture or cutaway section to allow passage of the mounting rod therethrough and locating means which engages with corresponding locating means on the mounting rod.
  • the releasable locking means is preferably located in the rung or other suitable mounting support of the structure.
  • the mounting rod passes through an aperture in the rung of the ladder.
  • the releasable locking means includes engagement unit slidable within the rung.
  • the locating means may be teeth or other types of formed notches on the engagement unit and the mounting rod which allow mechanical inter engagement.
  • the engagement unit is biased into an engaged position by a means such as a spring and released from the engaged position by movement against the bias so that locating means of the engagement unit no longer engage the corresponding locating means on the mounting rod.
  • a ferrule may be provided in the rung or mounting support to act as a bushing for the sliding movement of the engagement unit within the rung and as a support for the bias.
  • An extension to the engagement unit may cooperate with a recess or aperture in the ferrule to guide the movement of the unit in the ferrule.
  • the engagement unit may be provided with a latch mechanism to prevent the engagement unit from disengaging from the mounting rod and the extension of the engagement unit may form part of that latch mechanism in which the extension may be pivotally connected to the engagement unit with a fixture in the rung or ferrule engaging with a notch in the extension when the engagement unit is engaged with the mounting rod.
  • the latch mechanism is preferably disengaged by an actuator on the outside of the mounting support.
  • the elongate member comprises housing and a foot with the mounting rod directly secured to the foot.
  • the mounting rod can be used to provide the main support for the elongate member reducing stresses on the elongate housing.
  • a structure for use on an uneven surface including a plurality of upright legs, at least one elongate member received within an upright leg housing of at least one leg and extending longitudinally beyond the leg housing to contact a support surface, a mounting rod extending longitudinally along from said elongate member to slidingly engage a fixture within the structure and releasable locking means for securing the position of the mounting rod relative to the upright legs of the structure, the releasable locking means being located in a mounting structure and including an engagement unit slidable within a mounting support of the structure, the engagement unit being provided with an oversized aperture to allow passage of the mounting rod therethrough and locating means which engages with corresponding locating means on the mounting rod.
  • the releasable locking means is preferably located in the rung or other suitable mounting structure with the mounting rod passing through an aperture in the structure.
  • the releasable locking means includes engagement unit slidable within the mounting structure.
  • the locating means on the engagement unit and the mounting rod may be teeth or other types of formed notches which allow mechanical inter engagement.
  • the engagement unit is biased into an engaged position by a means such as a spring and released from the engaged position by movement against the bias so that locating means of the engagement unit no longer engage the corresponding locating means on the mounting rod.
  • a ferrule may be provided in the rung or like mounting support to act as a bushing for the sliding movement of the engagement unit within the rung and as a support for the bias.
  • An extension to the engagement unit may cooperate with a recess or aperture in the ferrule to guide the movement of the unit in the ferrule.
  • the engagement unit may be provided with a latch mechanism to prevent the engagement unit from disengaging from the mounting rod and the extension of the engagement unit may form part of that latch mechanism in which the extension may be pivotally connected to the engagement unit with a fixture in the rung or ferrule engaging with a notch in the extension when the engagement unit is engaged with the mounting rod.
  • the structure is a ladder and the mounting support is a ring of the ladder.
  • the structure may also be a table or desk.
  • the invention provides a structure having two or more support legs, one or more of the support legs having a device for adjusting the length of the leg, said device including at least one elongate member received within an elongate housing in a support leg and extending beyond the end of the elongate housing for contacting a support surface and a releasable locking means cooperating with the at least one elongate member to secure the elongate member in position relative to the respective support leg.
  • the releasable locking means includes an actuator for a locking means to engage the at least one elongate member, the locking means preferably being fixed in position relative to the respective support leg.
  • the at least one elongate member may comprise a mounting rod having mechanical engagement means extending along a portion of the length thereof.
  • the actuator is preferably a lever pivotally mounted to move the locking means of the releasable locking means into and out of engagement with the mechanical engagement means of the mounting rod.
  • the locking means and mechanical engagement means securably engage to hold the mounting rod in position relative to the support leg.
  • the locking means includes a clamp head which preferably is provided with teeth or formed notches for engagement with corresponding teeth or formed notches on the mounting rod.
  • the actuator is preferably bias to maintain contact between the clamphead of the locking means and mechanical engagement means.
  • the clamphead preferably has a jaw with a semi-circular cross section to engage with the circular cross section of the mounting rod.
  • each elongate member is provided with two mounting rods, each preferably being provided with a corresponding mechanical engagement means for engagement with a locking means secured to the support leg.
  • the locking means of each mounting rod is preferably activated by a single lever.
  • the actuator in another form, which is able to slide within its pivot mounting to the support, acts under the action of the bias to mechanically engage the locking means with the mounting rod. By sliding movement of the actuator in its pivot mounting, the locking means is able to move upwardly with the mounting rod to locate and be secured within a cutaway section in the support.
  • the cutaway section and the locking means may further be provided with a corresponding notch and protrusion to mechanically interengage.
  • the adjustable support is a table or a ladder.
  • the invention further provides in another aspect, a device of claim 30, wherein the at least one elongate member comprises a mounting rod having mechanical engagement means extending along a portion of the length thereof.
  • Figure 1 is an end sectional view of the support leg within the elongate housing of a structure
  • Figure 2 is a front sectional view of the support leg of Figure 1
  • Figure 3 is a front sectional view of a releasable locking means in accordance with an embodiment of the invention
  • Figure 4 is an in line for assembly view of a section of the embodiment of the releasable locking means of Figure 3
  • Figure 5 and Figure 6a and 6b are perspective and side views of releasable locking means in accordance with a second embodiment of the invention
  • Figure 7 is a third embodiment of the releasable locking means of the invention
  • Figure 8 is a fourth embodiment of the releasable locking means of the invention
  • Figure 9 is a side view of a fifth embodiment of the releasable locking means of the invention
  • Figure 10 is a perspective view of the fifth embodiment of
  • Figure 14(d) is a sectional view of the adjustment mechanism shown in fixture of Figure 14(e);
  • Figure 14(e) is a side view of a table having a top which can be adjusted to different heights.
  • Figure 14(f) is a perspective view of the rear of the side shown in Figure 14(e);
  • Figures 15(a) to 15(c) are an eighth embodiment of the invention shown in side elevation demonstrating the operation of the releasable locking means; and
  • Figures 16(a) to 16(c) are perspective views of the embodiments of the actuator of Figures 15(a) to 15(c).
  • the invention is applicable to any structure such as a table, having two or more legs in which at least one leg consists of an elongate housing capable of being adapted to receive an elongate member.
  • a device for levelling a structure such as a ladder having two or more support legs is shown.
  • the device includes an elongate member 10 which in use is received within an elongate housing 11 forming the support legs.
  • the elongate member 10 extends in the longitudinal direction of the support leg beyond the end of the support leg 11 and is provided with a foot 14 at the lower end for contacting the surface upon which the structure stands or is to stand.
  • a mounting rod 12 extends longitudinally beyond the elongate member and slidably engages a mounting support such as a rung 13 in the structure. It may be structurally advantageous for the mounting rod 12 to extend the full length of the elongate member 10 and be secured directly to the foot 14. In this way, the mounting rod is able to support some or all of the load of the structure.
  • a releasable locking means 20 is provided in the fixture 13 to secure the position of the mounting rod 12 and the elongate member 10 within the support leg 11. As mentioned above, the direct connection between the locking means and the foot of the elongate member through the mounting rod enables the load of the structure such as a table to be transferred directly to the ground.
  • the releasable locking means shown in Figures 3 and 4 includes an engagement unit 15 slidable within the mounting support as rung 13 in a path generally perpendicular to the mounting rod 12.
  • the engagement unit 21 may be provided with an oversized aperture 22 (as best shown in Figures 7 and 8) through which the mounting rod 12 passes.
  • the engagement unit 21 preferably slides within a ferrule 23 which is positioned within the rung and may have an extension arm 24 extending through an aperture 25 in the ferrule.
  • a bias 26 such as a resilient member or spring, urges the engagement unit 21 into engagement with the mounting rod 12.
  • the engagement unit 21 will generally comprise a forward section 26 having teeth or ribs 27 for contacting and engaging with corresponding teeth or ribs 28 on the mounting rod 12 so that a mechanical inter-engagement can be formed.
  • the simplest and most inexpensive version of teeth or ribs formed on the mounting rod 12 may be a threaded bar (not shown) which interlocks with corresponding teeth or ribs 27 formed on the inner side of the oversized hole 22.
  • the engagement unit further comprises a rear section 29 which has a passage 30 of sufficient size to allow the engagement unit 21 to move out of mechanical engagement with the mounting bar 12.
  • the rear section is preferably of sufficient length to be contactable from the outside of the rung 13.
  • a force is applied to the rear section of the engagement unit 21 to slide the unit within the ferrule 23 until the mechanical interlock is out of engagement.
  • the interior surface 31 of the ferrule 23 may be coated or lined with a coating or layer which reduces the sliding friction of the engagement unit. This coating also serves to reduce electrolytic or galvanic interaction between the metals of the ferrule and the engagement unit.
  • a further safety actuator may be provided to prevent unintentional disengagement of the engagement unit 21.
  • the front section of the engagement unit 121 is provided with a fin 122 having a cutaway portion 123.
  • the cutaway portion 123 abuts against an actuator 124 in its normal position as shown in Figure 6b.
  • the cutaway portion 125 is able to pass under the head of the actuator 124.
  • the aperture in the ferrule is of sufficient size and shape for the fin and extension arm 126 to pass therethrough.
  • the actuator 124 abuts the protruding portion 125 of the cutaway section of the fin 122.
  • the extension arm 220 of the engagement unit 221 is mounted for pivotal movement about a pivot point 222 on the engagement unit 221 to act as a latch to prevent the engagement unit 221 from sliding within the ferrule while in the engaged position.
  • the extension arm 220 is provided with a notched section 223 which engages with a fixed bar 224 to hold the engagement unit 221 in position.
  • the extension arm 220 is disengaged from the fixed bar 224 by depressing button or actuator 225 thereby pivoting the arm 220 away from the fixed bar 224.
  • the extension arm 320 is pivotally mounted to the ferrule 321 and contacts the front section of the engagement unit 322.
  • the arm has a bevelled leading edge 323 which contacts a fixed bar 324 to retain the engagement unit 322 in position. Upon rotation of the arm 320 away from the engagement unit, the unit is able to slide under force applied at 325 against the action of bias 326.
  • the releasable locking means is deactivated by applying a force against the engagement unit to disengage the engagement unit from the mounting arm 12. This allows the support leg to slide freely within the elongate housing 11 until the support leg is extended the desired length.
  • the bias within the rung forces the teeth or ribs of the engagement unit into engagement with the corresponding teeth, ribs or formed notches of the mounting rod 12 forming a mechanical engagement. This fixes the position of the mounting rod 12 and support leg with respect to the rung and elongate housing 11.
  • the engagement unit is disengaged from the mounting rod 12 to allow the rod to slide freely through the aperture in the rung so that the extension of the support leg can be reset.
  • a device for locking an extension of the leg of a table or ladder is shown in which an engagement unit 300 is provided within a sleeve 302 mounted with a fixture 304 such as the rung of a ladder or a table leg.
  • the engagement unit 300 is provided with an elliptical opening 306 which engages with the elongate member 308.
  • the opening 306 is provided with a mechanical interlocking means such as teeth (not shown) which cooperate with corresponding interlocking means 310 on the elongate member shown in Figure 14(d).
  • a mechanical interlocking means such as teeth (not shown) which cooperate with corresponding interlocking means 310 on the elongate member shown in Figure 14(d).
  • the engagement unit is provided with a bias such as a spring 312 to urge the engagement unit into a position whereby the locking means are not in engagement.
  • a dimple 314 is provided by bunching a depression 316 into the outside of the sleeve causing a dimple 314 to be formed on the inner surface of the sleeve. This dimple serves to retain the outer edge 318 of the engagement unit 318 against the action of bias 312.
  • the engagement unit 300 can be disengaged from dimple 312 by pressing the unit towards the bias and away downwardly. However, this can only be done when the elongate member does not have a load pushing it in the direction of arrow A.
  • a single adjustment unit 320 can be used with stabilizing attachments 322.
  • the elongate member may be unloaded by forcing the elongate member in the direction of arrow B.
  • the table surface is provided with two stabilizing elongate rods 324 and a single lift rod 326.
  • the lift rod is similar to that shown in Figure 14(d) and allows extension of the rod relative to the fixture 328 by depressing engagement unit 300 as described earlier allowing the rod 308 to slide within tube 330.
  • the lift rods are provided with a similar mechanism 332 to enable extension of the lift rods 324 to the fixture 328.
  • the lift rods are supported within the shell of the fixture 328 by guide brackets 334.
  • the releasable locking means includes a body 69, an actuator 70 for locking means 71 to engage an engagement means 72 on the elongate member 73.
  • the elongate member includes mounting rods 56 which are received within elongate housings 55 and slide within those housings.
  • the actuator 70 is shown in Figures 15(a) to 15(c) as a lever pivotally mounted to the support leg 4 about a pivotal connection 74.
  • the actuator 70 is provided with a bias 75 such as a spring for maintaining engagement between the clamphead or jaw of the locking means 71 and the mechanical engagement means 72 on the mounting rods 73.
  • FIG 16 is an alternative form of the embodiment shown in Figures 15(a) to 15(c).
  • actuator 80 engages locking means 81 with corresponding locking means on elongate members.
  • Locking means 81 is secured to a cradle 82 in actuator 8 by means such as welds 83.
  • Locking means is provided with a locking tab 85 to provide a load bearing flange fixed to the body of the releasable locking means 69.
  • the body 69 is provided with a recess for receiving the locking tab 81.
  • the actuator is able to move its pivot axis sufficiently to disengage the locking tab 86 from the recess in the body 69 and the actuator is able to freely pivot about its pivotal axis and thereby disengage the locking means 81 from the elongate member.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Ladders (AREA)

Abstract

L'invention concerne un dispositif de support ajustable destiné à une échelle, à un panneau d'échafaudage ou à une structure similaire. Ce dispositif comprend au moins un élément allongé (10, 56) logé au sein d'un logement allongé (11) dans un pied support de ladite structure. Cet élément allongé (10, 56) s'étend au-delà du pied du logement allongé de manière à rentrer en contact avec une surface de support et il comporte un dispositif de verrouillage libérable (20, 63) coopérant avec l'élément allongé (10, 56) afin de fixer l'élément allongé à une certaine position par rapport au pied support respectif. Dans un mode de réalisation, ce dispositif de verrouillage libérable (20) comporte, d'une part, un module d'imbrication (15) coulissant avec un support de montage (13) et doté d'une ouverture surdimensionnée (22) élaborée pour permettre le passage de la tige de montage (12) et, d'autre part, un dispositif de localisation (27) qui rentre en contact avec un dispositif de localisation (28) correspondant sur la tige de montage. Dans un autre mode de réalisation, ce dispositif de verrouillage libérable (63) comporte un dispositif d'actionnement (68) destiné à un dispositif de verrouillage de façon à rentrer en contact avec l'élément allongé (56). Ce dispositif d'actionnement (58) est monté pivotant afin de déplacer le dispositif de verrouillage (59) pour l'imbriquer et le désimbriquer de l'élément allongé.
PCT/AU2004/001128 2003-08-22 2004-08-23 Dispositif de support ajustable WO2005019591A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU2003904579 2003-08-22
AU2003904579A AU2003904579A0 (en) 2003-08-22 Adjustable support leg

Publications (1)

Publication Number Publication Date
WO2005019591A1 true WO2005019591A1 (fr) 2005-03-03

Family

ID=34200709

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU2004/001128 WO2005019591A1 (fr) 2003-08-22 2004-08-23 Dispositif de support ajustable

Country Status (1)

Country Link
WO (1) WO2005019591A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2060202A3 (fr) * 2007-11-14 2010-12-22 Veyhl GmbH Support réglable en longueur

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5678656A (en) * 1995-07-25 1997-10-21 Lanzafame; Philip F. Positive engaging ladder stabilizing and leveling device
US5704451A (en) * 1996-12-20 1998-01-06 King; Steven L. Ladder stabilizing system
GB2318505A (en) * 1996-10-23 1998-04-29 Fox Design Int Telescopic leg
DE20017803U1 (de) * 2000-10-17 2002-02-28 Grahl Gmbh Stufenweise längenverstellbares Tischbein
US20020139908A1 (en) * 2001-03-29 2002-10-03 Junji Oyama Equipment adjusting leg

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5678656A (en) * 1995-07-25 1997-10-21 Lanzafame; Philip F. Positive engaging ladder stabilizing and leveling device
GB2318505A (en) * 1996-10-23 1998-04-29 Fox Design Int Telescopic leg
US5704451A (en) * 1996-12-20 1998-01-06 King; Steven L. Ladder stabilizing system
DE20017803U1 (de) * 2000-10-17 2002-02-28 Grahl Gmbh Stufenweise längenverstellbares Tischbein
US20020139908A1 (en) * 2001-03-29 2002-10-03 Junji Oyama Equipment adjusting leg

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2060202A3 (fr) * 2007-11-14 2010-12-22 Veyhl GmbH Support réglable en longueur

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