FR2458406A1 - SWIVEL WHEEL STRUCTURE FOR ARMCHAIRS, CHAIRS AND THE LIKE - Google Patents

Abstract

THE PRESENT INVENTION CONCERNS A SWIVEL WHEEL STRUCTURE FOR ARMCHAIRS AND CHAIRS. THIS WHEEL INCLUDES A CENTRAL BODY 4 INCLUDING, AT ITS LOWER END, A CRADLE SEAT 5, IN WHICH A TRANSVERSAL PIN 6 ENGAGES SUPPORTS THE WHEELS 10. THE BODY INCLUDES A VERTICAL CAVITY 8, IN WHICH IS ENGAGED A VERTICAL journal 7.

Description

1. 2458406

  The present invention relates to a pivoting wheel structure,

  especially for armchairs, chairs and the like.

  It is well known that the swivel wheels for armchairs and chairs are

  its, for example offices, are generally formed of a support connected to the lower end of the chair or the like, and can rotate freely

around a vertical pin.

  This support is connected to a wheel or to a pair of wheels, able to turn about a horizontal axis or inclined in any way, for

to obtain the pivoting of the wheel.

  Wheels of known type, obtained by assembling many elements

  as a result of difficulties in mounting and the need to

  a very specialized workforce, therefore have a very complex structure.

  Another disadvantage of known type swivel wheels is that they

  are subject to frequent jamming, that is to say that friction, which may be important, oppose the free rotation of these wheels, either around the horizontal axis or around the vertical axis connecting them to the chair. The object of the present invention is to eliminate the disadvantages

  above, by providing a pivoting wheel structure

  absolute rules of good functioning, and which can be carried out very

  from a very small number of elements.

  A particular object of the present invention is to provide a very simple and fast pivoting assembly or assembly wheel structure,

  achievable without requiring complex and very expensive tools.

  Another object of the present invention is to provide a pivoting wheel structure which, thanks to its simplicity, is reliable operation, without jamming or rapid wear, even under operating conditions

the hardest.

  Another object of the present invention is to provide a swivel wheel structure easily obtainable by means of elements and materials which are readily available commercially, and very competitive by

its cost price.

  The goals mentioned above and others which emerged

  from the following description, are obtained by a swivel wheel

  for armchairs, chairs and the like which according to the invention comprise

  a support, on the outer surface of which is formed a cavity allowing

  both a rotational engagement with a vertical trunnion associated with the

  lower half of an armchair, chair or the like.

  This structure is characterized in that it comprises a central body extending downwards from said support and provided, at its end

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free, from a cradle seat.

  A transverse trunnion is able to engage in the latter. At its free ends, this trunnion supports two pivoting wheels which are

  equipped with a flanged collar, suitable for accommodation in side-to-side seats

  side with respect to said cradle seat to prevent the translation of said

wheels relative to said trunnion.

  Other features and benefits will emerge better from the mode

  preferred, but not exclusive, execution described below, relating to a structure

  wheel caster for armchairs, chairs and the like, and shown at

  indicative, but not limiting, example in the drawing annexed

  Fig. 1 shows a side elevational view of the swivel wheel according to the invention; Fig. 2 shows the same pivoting wheel cut in a vertical plane; Fig. 3 is a bottom view of the swivel wheel, and

  Figure 4 shows the vertical trunnion at the ends of the

which wheels are connected.

  With particular reference to the figures of said figures, the swivel wheel structure, generally indicated by the reference numeral 1, comprises a support 2 extending essentially in a half-circle, so as to

  to function as outer fairing for the wheels.

  This support 2 is provided on its outer surface with a cavity

  vertical axis 3, in which, in order to rotate, the

  vertical lon associated with the lower end of a chair or the like (not shown). In this way, the wheel can rotate freely around an axis

substantially vertical.

  Said support is provided on its inner part with a central body

  tral 4, at the free end of which is formed a cradle seat 5, in which can engage a transverse pin 6 extending essentially in a

  horizontal plane and hence perpendicular to the axis of the cavity 3.

  This pin is advantageously provided, on a median portion, with a pin 7 extending perpendicularly to the pin 6, which may be

  housed in a blind hole 8 provided axially in the central body.

  Two wheels 10 can be associated with the free ends of the wheel.

  to rotate, said wheels being provided, at the

  right of the hub, a collar 11 which is threaded on the pin 6 provided with a

flange 12.

  This flange can be inserted in a seat 13 formed on the cotPs4

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  laterally with respect to the cradle seat 5, so that the housing

  of the flange 12, inside the seat 13, prevents the translation in the direction

  axial direction of the wheel 10 with respect to the journal 6.

  The engagement of the journal 6 in the cradle seat 5 is performed

  forced deposition, so that the engagement can be final. To make this commitment stable and irremovable, we execute

  deformations 20 on the edges of the seat 5, by means of punching or other

  similar, these deformations surrounding at least partially the trunnion

  6, so as to prevent its release from the cradle seat 5.

  In this way, the swivel wheel is fully assembled and the

  rotation of the wheels 10, resting on the tiles, takes place only around the

  rillon 6, so with a reduced coefficient of friction and more

large rolling said wheels.

  Referring to the previous description, it is obvious that the

  The present invention achieves the above-mentioned objects. In particular,

  note the great simplicity of assembly and realization, because the

  port 2 is formed by a single piece of molding, to which one simply has to

  associate the pin 6 and previously connect the wheels 10.

  Other operations are not necessary to carry out the assembly.

  or assembly of the wheel, except for the deformation which prevents

  a possible release of the trunnion member 6 from the cradle seat 5.

  In addition, the sliding having occurred as a result of the rolling of the collars 11 relative to the pin 6, that is to say by friction between a metal pin and plastic wheels, the coefficient of friction is very small and especially , since it is not necessary to interpose balls

  or others, it is also certain that jamming

  wear or deformation of these elements can not be

  reduce. For assembly to the mounting of the swivel wheel according to the present

  invention, it is not necessary to use any particular apparatus,

plexes or expensive.

  In addition, the assembly can be achieved even by employing a

  low-skilled labor, with obvious economic benefits.

  The invention is susceptible of modifications in the context of the

  present invention, without modifying the inventive concept.

  In addition, all details can be replaced by elements

technically equivalent.

  In practice, the materials used, as well as the dimensions

  39 and specific shapes, may be different, depending on the requirements.

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Claims (5)

  A pivoting wheel structure for armchairs, chairs or the like, comprising a support on the outer surface of which a cavity is formed   allowing the rotation engagement with a vertical pin, associated with the ex-   lower end of an armchair, chair or the like, characterized in that it comprises a central body extending downwards from said support and provided, at its free end, with a cradle seat, in which engage a   transverse trunnion, the free ends of which support two   aunts provided with a collar with flange, adapted to fit in seats arranged side by side with respect to said cradle seat, to prevent the translation of wheels, with respect to said journal.   Swivel wheel structure according to Claim 1, characterized   in that said support is formed by a one-piece molding body.   Swivel wheel structure according to claims 1 and 2, characterized   characterized in that it comprises a pin extending radially from a medial portion of said transverse trunnion and adapted to be housed in a blind hole,   provided axially in said central body.   4. Swivel wheel structure according to any one of the claims   previous arrangements, characterized in that said pin is adapted to be housed   in said cradle seat by forced depression.   Swivel wheel structure according to any one of the claims   tions, characterized in that it comprises deformations practically   at the edge of the said cradle seat, capable of stabilizing the engagement between the   23 trunnion and the cradle seat.