Abstract:
A device for drawing out heavy loads including at least one drawing-out rail having a I-shaped cross-section and a vertical central plane of symmetry, running rollers provided on opposite sides of the drawing-out rail, and a pair of stationary rails or a pair of rails at least partially displaceable in a longitudinal direction, the rails of the pair of rails being arranged on opposite sides of the drawing-out rail for supporting the running rollers, with flanges of the rails forming tracks for the running rollers, and with the stationary rails, the drawing-out rail, and the partially displaceable rails being all formed of rolled steel sections.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a drawing-out device including at least one drawing-out rail, and at least two stationary rails, with running or support rollers being supported at front in a drawing direction, and/or rear, with respect to the drawing direction, end portions of respective rails. 
     2. Description of the Prior Art 
     In many cases, it is desirable to have a possibility to displace horizontally heavy loads. E.g., fire-engines carry heavy motor pumps which should be unloaded and properly positioned. The heavy elements or loads need be taken off from the fire-engine and positioned on the ground. Conventional drawing-out devices with rails formed of sheet metal strips cannot perform this task. 
     Accordingly, an object of the present invention is to provide a device capable of withdrawing out heavy loads and which would have, at the same time, relatively small dimensions. 
     SUMMARY OF THE INVENTION 
     This and other objects of the present invention, which will become apparent hereinafter are achieved by forming the load-carrying drawing-out rail as an I-shaped rail having a vertical central plane of symmetry and by forming all rails of the device of rolled steel sections. The present invention permits to adapt the inventive drawing-out device to different tasks and to provide modular components of which a device can be formed in accordance with a task it has to perform. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     The features and objects of the present invention will become more apparent, and the invention itself will be best understood from the following detailed description of the preferred embodiments when read with reference to the accompanying drawings, wherein: 
     FIG. 1 shows a partially cross-sectional side elevational view of a drawing-out rail of a device for drawing out heavy loads according to the present invention; 
     FIG. 2 shows a cross-sectional view along the line II--II in FIG. 1; 
     FIG. 3 shows a partially cross-sectional side elevational view of a stationary rail of a device for drawing out heavy loads according to the present invention; 
     FIG. 4 shows a cross-sectional view along line IV--IV in FIG. 3; 
     FIG. 5 shows an elevational view of intermediate rail of a device for drawing out heavy loads in a completely drawn-out position; 
     FIG. 6 shows a cross-sectional view along line VI--VI in FIG. 5; 
     FIG. 7 shows a cross-sectional view along line VII--VII in FIG. 5; 
     FIG. 8 shows a side elevational view of a simplified version of a device for drawing out heavy loads formed of rails shown in FIGS. 1 and 3; 
     FIG. 9 shows a front view (in a direction of arrow A in FIG. 8) of the device shown in FIG. 8; 
     FIG. 10 shows a rear view (in a direction of arrow B in FIG. 8) of the device shown in FIG. 8; 
     FIG. 11 shows a front view of a twin version of the device shown in FIGS. 8, 9 and 10; 
     FIG. 12 shows a rear view of a twin version of the device shown in FIGS. 8, 9 and 10; 
     FIG. 13 shows a front view of a device for drawing out heavy loads formed of drawing-out, stationary and intermediate rails; 
     FIG. 14 shows a rear view of the device shown in FIG. 13; 
     FIG. 15 shows a partially cross-sectional front view of the intermediate rail of the device shown in FIGS. 13; 
     FIG. 16 shows a partially cross-sectional rear view of the intermediate rails of the device shown in FIGS. 13-14; 
     FIG. 17 shows a front view of a twin version of the device shown in FIGS. 13-14; 
     FIG. 18 shows a rear view of a twin version of the device shown in FIGS. 13-14; 
     FIG. 19 shows, at an increased scale, a side view of a running or support roller with a conical running surface of device for drawing out heavy loads according to the present invention; 
     FIG. 20 shows a top view of the device shown in FIGS. 8, 9 and 10 in a partially drawn-out position; 
     FIG. 21 shows a top view of the device shown in FIGS. 13-14 in a partially drawn-out position; 
     FIG. 22 shows a partially cross-sectional view of a U-shaped bearing block of a device for drawing out heavy loads according to the present invention; 
     FIG. 23 shows a view illustrating support for a running roller with a cylindrical running surface with grooves formed therein; 
     FIG. 24 shows a view illustrating support for a running roller with a smooth cylindrical running surface; 
     FIG. 25 shows an elevational view of a U-shaped profile of which the rails of a drawing-out device according to the present invention is made; 
     FIG. 26 shows an elevational view of another U-shaped profile of which the stationary rail of a drawing-out device according to the present invention is made; 
     FIG. 27 shows an elevational view illustrating a position of bearing block of a drawing-out device according to the present invention; and 
     FIG. 28 shows an elevational view illustrating another-possible position of bearing block of a drawing-out device according to the present invention 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     A device for drawing out heavy loads according to the present invention is formed of a rolled steel and particular of a U-shaped rolled steel sections 1 which are used for forming a stationary rail 2, a drawing-out rail 3, and an intermediate rail 4, which are formed by pairs of U-shaped sections having their web portions abutting each other. FIG. 1 shows the drawing-out rail 3 which is formed in this way. The flanges 5 are used as tracks for running rollers 6. The running rollers 6 used in this embodiment have, as shown in FIG. 19, a conical running surface 7, with a cone angle of about 10°. Axle journals 8 of the running rollers 6 have two sections, a first threaded cylindrical section 9, and a second conical section 10, which is formed as a cone stub with a cone angle also of about 10°. For securing the running rollers 6 on the drawing-out rail 3, there is provided a bearing block 11 having a U-shaped cross-section. The bearing block 11, which is shown in FIG. 22, has threaded bores 13 formed in the two legs 12 thereof. The internal width W of the U-shaped bearing block 11 correspond to the thickness S of the two, abutting each other, webs of the U-shaped sections 1. In the rear region of the drawing-out rail 3, where the track flanges 5 are provided, the bearing block 11 is mounted on the web from above. The vertically extending webs have bores, which are aligned with the bores 13 formed in the legs 12 of the bearing block 11, for receiving the second, conical sections 10 of the axle journals 8 of the running rollers 6. The axis of the web bores extend perpendicular to the web plane. In front of a running roller 6, there is provided, in one of the webs, a stop 14 which limits the drawing-out path of the device. For forming the drawing-out rail, the preliminary cut-out sections of the U-shaped profile are assembled with their webs abutting each other, then the bearing block 11 is mounted on the abutting each other webs, and then the axle journals 8 of the running rollers 6 are screwed in, with the second, conical sections 10 of the axle journals 8 extending into the bores formed in the webs of the arranged back-to-back U-shaped sections, securing the bearing block 11 on the rail. 
     The stationary rail 2, which is shown in FIG. 3, is likewise formed of U-shaped sections of rolled steel. The running or support rollers 15 are mounted on this rail in the front portion thereof. As in the drawing-out rail 3, the stationary rail 2 likewise includes a bearing block 11 for mounting the running or support rollers 15. On the web of one of the U-shaped rolled sections, there is provided a stop 16 which cooperates with the stop 14 provided on the drawing-out rail 3. 
     A simplified version of a drawing-out device according to the present invention is formed only of the drawing-out rail 3 and the stationary rail 2. Such a simplified drawing-out out device is shown in FIGS. 8-10 and 20. The simplified version of the inventive drawing-out device permits to use a twin arrangement of this device, with the devices, each of which is formed of only stationary 2 and drawing-out 3 rails, being mounted, as shown in FIGS. 11-12, back-to-back. In the twin arrangement, there are provided two drawing-out rail 3 and three stationary rail 2. This arrangement can be easily duplicated, with respective stationary and drawing-out rails being provided on one or both sides of the arrangement. 
     If the drawing-out device should be formed for a complete withdrawal, then an intermediate rail 4 becomes necessary. Each intermediate rail 4, which is shown in FIG. 5, is likewise formed of paired U-shaped sections, with their webs abutting each other. The running rollers 18, 19 are mounted on the rail 4 with a simplified bearing block 17. The running rollers 18, 19 are mounted in the front and rear portions of the rail 4. The bearing block 17, like the bearing block 11, is provided with threaded bores for receiving the axle journals of the running and support rollers 18 and 19. The bearing block 17 is formed substantially as a simple stone which is mounted on a web of one of the U-shaped sections. For a twin arrangement, the intermediate rails 4 are connected with each other by a transverse bar 20, as shown in FIGS. 15-16. 
     A drawing-out device according to the present invention designed for a complete withdrawal of a load is shown in FIGS. 13, 14 an 21. In this device, there are further provided two additional stops 21 and 22 secured on the vertical webs of the intermediate rails 4. the complete withdrawal devices can also be formed in a twin or multiple version, as shown in FIGS. 17-18. At that, the transverse bars 20, which connect the intermediate rails 4, are alternatively located above and below the intermediate rails 4. 
     In all of the embodiments of a drawing-out device according to the present invention, the running rollers have conical running surfaces 7 and the axles of which extend at an angle. The end surfaces 23 of these rollers form with respective web of the associated rails acute angles. 
     It is within the scope of the invention, that the running rollers with a cylindrical running surfaces can be used. To provide for side guidance of these rollers, they are provided, as can be seen in FIG. 23, a with cylindrical running surface 24 having one or more grooves 25 which form-lockingly engage bars 27 provided on cheeks 26 of the U-shaped sections. A bearing block 28, which is used for mounting rollers with a cylindrical running surface, can be provided, on its upper or lower side, likewise with grooves in which the bars 27 form-lockingly engage for positioning of the bearing block 28. Instead of running rollers having a grooved cylindrical running surface 24, running rollers with a smooth cylindrical running surface can be used. Such rollers 30 are shown in FIG. 24. When such running rollers are used, respective bearing blocks 29 are provided with guide rollers 31, which freely rotate about a vertical axis. The guide roller 31, in this case, rolls over a side edge of a flange of an adjacent U-shaped rail, as shown in FIG. 24. The guide roll 31 can be mounted above or below the axle of a respective running or support roller. For securing the rails on a body or for securing a load on the rails, T-shaped grooves 33 can be formed on the outer sides of cheeks 32 of U-shaped sections, as shown in FIG. 25. 
     A version of form-locking support for a bearing block is shown in FIG. 26. Here, grooves 34 are formed in the transitional regions between the checks and the web of a U-shaped section. The bearing block 35 is provided with bead-shaped edges corresponding to the shape of the grooves and which form-lockingly engage in the grooves 34. 
     It should be further mentioned that it can have a height h smaller than the height H of the U-shaped section 1, with the bore for receiving an axle journal of a running roller 30 being located eccentrically with respect to the middle of the height h. The bearing block 35 can so be arranged in the U-shaped section that the axis of the axle journal-receiving bore is located in the middle of the height of the U-shaped section, as shown in FIG. 27, or it can be located in offset relationship with respect to the middle of the height H of the U-shaped section, as shown in FIG. 28. Thereby it is possible to so arrange adjacent rails that their flanges or checks are arranged flush with respect to each other or are vertically offset relative to each other, as shown in FIGS. 27 and 28, respectively. 
     FIGS. 9 and 10 show an element of the inventive drawing-out device which, as a rule, is used in a twin arrangement. In the disclosed embodiments, the upper flanges of the drawing-out rail 3 have a highest position in comparison with upper flanges of adjacent rails. However, an arrangement of rails is possible in which the drawing-out rail stays on its head, so to say, as shown in FIGS. 9-12, i.e., it is pivoted with respect to an axis perpendicular to the plain of the drawing by 180°, so that the intermediate rail is higher than the drawing-out rail. Instead of the I-shaped profile, which is formed of a pair of U-shaped sections having their webs abutting each other, a rolled I-shaped sections can be used for forming the rails. 
     Though the present invention was shown and described with reference to the preferred embodiments, various modifications thereof will be apparent to those skilled in the art and, therefore, it is not intended that the invention be limited to the disclosed embodiments or details thereof, and departure can be made therefrom within the spirit ad scope of the appended claims.