Abstract:
A roller arrangement for rollers on which luggage containers such as suitcases, trolleys and the like can be moved comprises several rollers supported in a corner area of the lower edge of a container in a roller housing which reinforces the corner. A rocker which can be displaced is arranged in the roller housing. At least one roller is arranged at a distance from the bearing of said rocker. The rocker is additionally, completely or partially cushioned by one or several elastomer pads.

Description:
This application is a continuation of PCT/EP99/06134 Ser. No. 08/21/1999. 
    
    
     BACKGROUND OF THE INVENTION 
     Field of the Invention 
     The present invention relates to a luggage container having wheels with shock absorbers. 
     Such a roller arrangement, as described in British Patent publication 2,304,095 or in U.S. Pat. No. 4,524,482, is particularly common in hard-shell suitcases, but also increasingly in hand luggage such as conventional trolleys. Such roller arrangements have for this purpose reinforced rounded corners in which rollers are mounted having running surfaces extending over the corresponding roller housing in the corner area, in such a way that in each case contact with the ground is maintained when such luggage is switched in the position for pulling. 
     According to one roller arrangement, which is described in British Patent GB860352A, a roller is mounted by a pivoting lever or arm which is supported against an elastomer pad inside a roller housing or well. 
     The known roller arrangements have the disadvantage that shocks caused by the irregularities of the ground are transmitted to the luggage containers without sufficient absorption, since the surface of the roller generally is provided by a wheel ring made of a relatively hard elastomer. In the case of heavy luggage containers, there is after a short time of use the danger that the ring be destroyed which generates high repair costs, particularly since the simple replacement of the roller by the user is not possible most of the time. 
     SUMMARY OF THE INVENTION 
     It is an object of the present invention to provide a roller arrangement which not only has a lifetime which is longer than the known roller arrangements, but also which improves the rolling comfort or smoothness of the ride as the luggage container is in motion. 
     According to the invention, there is provided a luggage container having a roller arrangement for rolling movement of luggage containers such as suitcases trolleys, and the like, wherein one or more rollers are each rotatably mounted in a corner area of the lower bottom edge of a container in a roller housing which reinforces the corner, wherein in the roller housing a pivot arm is pivotally mounted to which at least one said roller is mounted at a distance from a bearing of said roller, movement of said pivot arm being cushioned, in both pivot directions, by one or more elastomeric pads. 
     In this respect, it is particularly important to stress that the roller in each housing is not mounted directly but rather by a pivoting member whose movements are damped by one or more elastomeric pads or specific elastomeric absorbers. For this purpose, there is provided, in an appropriate order between the pivoting members and the roller housing, such elastomeric pads or elastomeric absorbers as damping elements. It is particularly advantageous that damping elements are provided both above and below the pivoting member with respect to the pulling position of the luggage. This way, vertical shocks are efficiently absorbed, particularly for the vertical component of the shock absorption. 
     Due to the shock absorption of the pivoting member, a desirable decrease in the noise is obtained, i.e. in particular the shocks caused by cracks or seams in the floor or pavement are absorbed. 
     According to the invention, elastomer pads or absorbers having different softness or flexibility can be chosen as necessary; e.g. it is also possible that the absorber which is placed rearwardly above, on which essentially the total weight of the luggage rests, be relatively soft, while the lower absorbers provided on the front side of the pivoting member, be relatively stiff to limit the amplitude of the swing. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     The invention will be better understood by way of the following detailed description of preferred embodiments of the invention with reference to the appended drawings, in which: 
     FIG. 1 shows a roller arrangement with only one roller; 
     FIG. 2 shows a side view of a roller arrangement according to FIG. 1; 
     FIG. 3 shows a roller arrangement with double roller; 
     FIG. 4 shows a side view of a roller arrangement according to FIG. 3; 
     FIG. 5 shows a side view of a roller arrangement, wherein a coil spring is placed between the luggage container and the roller; and 
     FIG. 6 shows a side view of a further roller arrangement. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     A roller arrangement with only one roller is shown in FIGS. 1 and 2. The roller  1  is mounted inside the roller housing  2 , which is made, for example, of metal or hard plastic, and built in to the corners of the luggage. The outline of the luggage is shown simply by broken lines  3  for the bottom parallel and  4  for the vertical outline. A front side cover part  5  of the roller housing  2  makes mounting easier and ensures shock protection. 
     Inside the roller housing  2 , there is a pivoting member  6  in the area of the upper end which is mounted about the axle shaft  7  which is shown in FIG. 1 as axle  8 . The roller  1  again is mounted in the area of the lower end of the pivoting member  6  about axis  9 , shown in FIG. 1 as axis  10 . 
     The pivoting member  6  is essentially swing arm  11  with the two axes  8 ,  10  as well as a support  12  provided at its free end and extends from the arm towards the inner part of the roller housing  2 . The support  12  supports at its free ends outside of the circumference of roller  1  a support plate  13 , at which end an abutment surface is present. The roller  1  again in the area of lower end of the pivoting member  6  is rotatively connected about the axle  9 , shown in FIG. 1 as axis  10 . 
     The pivoting member  6  comprises essentially a swinging arm  11  having two axes  8 ,  10  and a support  12  provided at the free end of the swinging arm  11 , which support branches from the arm  11  toward the inside of the roller housing  2 . The support  12  has a support plate  13  at its free end outside the circumference of the roller  1 . An abutment surface  14  is formed on the support plate. 
     In order to restrict movement and support the swing movement of the pivoting member  6  and at the same time the roller  1 , two elastomeric absorbers are attached to the inside of the roller housing. A front or upper elastomeric pad  15  is placed adjacent to the axis  8  between the arm  11  of the pivoting member and the cover of the housing  5 . This elastomer pad  15 , which is preferably made of relatively hard elastomeric material, limits the rotational movement of the pivoting member in counterclockwise direction. The dampening properties of the upper elastomeric absorber  15  is basically responsible for the quiet running of the luggage container. 
     With respect to the swinging arm  11 , a further elastomeric absorber  16  is positioned rearwardly, such that the elastomeric absorber  16  essentially supports the weight of the luggage container when in the forward leaning pull position. Since the lower elastomeric absorber having an inner surface  17  facing the roller  1  contacts the abutment surface  14  of the support  12 , an elastomer material is selected with the purpose that it has a somewhat softer change of load compared with the upper elastomeric absorber, such that the shocks generated by the irregularities of the ground during pulling along and transmitted to the luggage container are relatively reduced in the upward direction. 
     The elastomeric absorbers are illustrated in the drawings as hatched simply to improve clarity and this should be in no case interpreted as a cross-sectional illustration. 
     In FIG. 2 the upper elastomer absorber  15  has been omitted for clarity. However, a housing cavity  17  is illustrated, in which the lower elastomer absorber  16  is received, as well as a housing cavity for the roller  1 . In this respect, FIG. 2 corresponds somewhat to sectional view about line II—II of FIG.  1 . 
     The embodiment of FIGS. 3 and 4 is different from the above described embodiment basically due to the positioning of the two rollers  1  which are rotatably mounted about axle  19  on the pivoting member  6 . Moreover, the lower elastomer absorber  16  is made smaller in comparison with the embodiment according to FIGS. 1 and 2, so that the absorber  16  is located inside contour  20  facing the roller housing  2 . Accordingly, the support  12  extends rearwardly. 
     As shown in FIG. 4, it will be seen that pivoting member  6  is placed in the middle between the two rollers  1  and that the support plate  13  is secured symmetrically to the support  12 . 
     In the embodiments of FIGS. 1 to  4 , the luggage container is always shown at rest in the vertical position with respect to the ground surface  21 . In the moving position, however, the luggage container is shown tilted forwardly about the rollers in the clockwise direction. This is shown in FIG. 5 where the roller  1  is in the forward rest position and in the rearwardly shifted moving position. For the rearward moving position, the change in the angle of surface of the ground is shown by dashed line  22 . This moving position corresponds to the swivel position of pivoting member  6  on which the roller  1  corresponding to the moving position of the luggage container is shown. 
     In the embodiment of FIG. 5, which shows a pivoting member  6  in form of the simple swing arm  11 , the above elastomer absorbers are not shown. Instead, a coil spring  23  is provided which is mounted about the upper bearing axle of the arm  11  and is supported with one end  24  between ribs  25  of the roller housing and with another end in a slot  26  of the arm  11 , such that the arm  11  is biased counterclockwise by the spring  23 . 
     FIG. 6 shows a roller arrangement in a preferred embodiment suitable for mass production. The roller housing  2  comprises a front side cover member  5  secured using a screw connection at  30 . A lengthwise vertically extending housing aperture in the cover member  5  is covered by a cover plate  31  secured to the cover member  5  by means of sideways biased anchoring members  32 . The cover plate  31  provides particularly a support for a logo or each trademark under which the finished piece of luggage will be sold. 
     On the lower side of the roller housing  2 , a first elastomeric absorber  15  is provided which is adjacent the upper end of the arm  11  of the pivoting member  6  and is supported by the front plate  33  of the cover member  5 . A second elastomeric absorber  16  is positioned above the support  12  of the pivoting member  6  and fills also a cavity above the support  12 . The absorber  16  is formed between the cavity and a lower angularly extending housing wall  34  of the roller housing  2 . The second elastomeric absorber  16  has a somewhat S-shaped contour corresponding to the extent of the upper side  35  of the support  12 , the contour being basically horizontally tilted. 
     In FIG. 6, the counterclockwise tilted position of the pivoting member  6  is shown in dashed lines, which position is assumed when the piece of luggage is pulled by the user. The bulge  36  resulting from the S-shape on the upper side  35  of the support  12  has the advantageous effect of reducing relative movement between the support  12  and the elastomeric absorber  16 , i.e. the pad  16  is practically only subjected to compression. In this way, the pads,  15  and  16  are porous blocks of elastomers and their molding under compression is made easier, thus prolonging at the same time their service life. Both pads  15 ,  16  have, as shown in the drawing, numerous parallel through-holes  37 , which are transverse to the load direction and are open from the side. 
     The hub  28  of the roller  1  is shown without any complementary cover. The holes  39  are for inserting mounting bolts of a corresponding hub cover. The roller  1  comprises preferably two roller bodies that are rotatably mounted tightly against one another about the axle  40 , thus achieving greater load capacity. 
     Embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows: