Abstract:
A transport cart for a pneumatic chisel hammer has two wheels, a protective cage and a holder. The protective cage has a flat base, a front side, a rear side and two flat leg sides, whereby at least one of the leg sides is at an angle between 60° and 80° relative to the base. The holder serves to secure the chisel hammer inside the protective cage. The user can pull the transport cart when it is upright on its base. The transport cart can be securely laid on its side on one of the leg sides in order to be stowed away. The slanting of the leg side enhances the stability by lowering the center of gravity.

Description:
FIELD OF THE INVENTION 
     The present invention relates to a manual transport cart for handheld power tools. Heavy handheld chiseling power tools are difficult to carry because of their size and weight of, for example, between 10 kg and 15 kg. 
     BACKGROUND 
     U.S. Pat. No. 1,898,369 A describes a transport cart. The transport cart stands on two wheels. A pneumatic chisel hammer can be affixed to a holder. A user can push or pull the transport cart by means of two handles that are on the transport cart. A similar transport cart is disclosed in German laid-open document DE 10 2006 000 105 A1. 
     SUMMARY OF THE INVENTION 
     The transport cart itself is inconvenient. The transport cart can only be loaded into a vehicle when it is upright, otherwise the heavy chisel hammer has to be removed. 
     It is an object of the present invention to provide a transport cart for a handheld power tool that is more convenient for daily use. 
     The present invention provides a transport cart for a pneumatic chisel hammer has two wheels, a protective cage and a holder. The protective cage has a flat base, a front side, a rear side and two flat leg sides, whereby at least one of the leg sides is at an angle between 60° and 80° relative to the base. The holder serves to secure the chisel hammer inside the protective cage. The user can pull the transport cart when it is upright on its base. The transport cart can be securely laid on its side on one of the leg sides in order to be stowed away. The slanting of the leg side enhances the stability by lowering the center of gravity. 
     One basic shape of the protective cage can be a convex element, and a geometric body that circumscribes the base, the front side, the rear side and the leg sides is a straight prism having a trapezoidal base area or a pyramid. The front side and the rear side can be parallel to each other or can be positioned relative to each other at a slant of 80° at the maximum. 
     One embodiment provides that the transport cart has a center of gravity, and a plumb line on the at least one leg side running through the center of gravity divides the leg side in the longitudinal direction into a first section and a second section, and the lengths of the sections are at a ratio between 1/3 and 3. The leg side has a markedly larger dimension in a direction that defines the longitudinal direction. 
     One embodiment provides that the surface area of the at least one leg side is larger than the surface area of the base. 
     One embodiment provides that a swiveling arm is present on the at least one leg side, and said arm can be swiveled out of the leg side at an angle. The swiveling arm is especially helpful for loading the transport cart into a motor vehicle. The swiveling arm has a bent end. The swivel axis of the swiveling arm is preferably perpendicular to the axis of the wheels. 
     One embodiment provides that the wheels are mounted on wheel brackets that can be swiveled into the protective cage. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The description below explains the invention on the basis of embodiments provided by way of example and on the basis of figures. The figures show the following: 
         FIG. 1 : a three-dimensional view of a transport cart; and 
         FIG. 2 : a side view of the transport cart. 
     
    
    
     Unless otherwise indicated, identical elements or elements having the same function are designated with the same reference numerals in the figures. 
     DETAILED DESCRIPTION 
       FIG. 1  shows a front view of a transport cart  10  by way of an example, in which a chisel hammer  11  is secured for the sake of illustration. During transportation, the chisel hammer  11  is protected against damage by a protective cage  12 . The protective cage  12  is dimensioned in such a way that the chisel hammer  11 , without tools, fits completely in the protective cage  12 . For example, the protective cage  12  can be made of tubes or other hollow profiles. 
     The geometry of the protective cage  12  shown by way of an example corresponds essentially to a straight prism. The bases of the prism form a flat front side  13  and a flat rear side  14  which are congruent and parallel to each other. A basic shape of the front side  13  and rear side  14  is a trapeze having a base line  15  and two legs  16 . One corner  50 ,  51  of the base line  15  with the legs  16  can be truncated, as depicted in  FIG. 1 . The angle  18  of the base line  15  with the legs  16  is within the range from 60° to 80°. Preferably, the trapeze is an isosceles trapeze, so that the two legs  16  are positioned at the same angle  18  with respect to the base line  15 . Opposite corners  17  of the front side  13  and of the rear side  14  in a lateral surface define side edges  19 ,  20  that run along a first direction  21 , that are parallel to each other and that are of equal length. The base lines  15  of the front side  13  and of the rear side  14  are laterally delimited by the first side edges  19  and they define a flat base  22 , while the legs  16  and the second side edges  20  define leg surfaces  23 . The base  22  and the leg surfaces  23  are both oriented along the first direction  21  and enclose the angle  18 . A surface area of the leg surfaces  23  is at least as large as the surface area of the base  22 . 
     The transport cart  10  can stand securely on the base  22 . As an alternative, the transport cart  10  can be tilted with respect to the first direction  21  and laid onto the leg surface  23 , where it then also stands securely. The latter position is intended for stowing the transport cart in the trunk of a conventional European passenger car. In the sideways position, the vertical dimension of the transport cart  10  is smaller. It should be pointed out that this also lowers the center of gravity  24  of the transport cart  10 . The slanted leg surfaces  23  additionally assist in lowering the center of gravity  24  as compared to leg surfaces arranged at a right angle relative to the base  22 . 
     A plumb line  25  on the leg  16  divides the leg  16  into an upper section  26  and a lower section  27 . The ratio of the length of the upper section  26  to the length of the lower section  27  is, for example, between 1/2 and 5. 
     In another embodiment, the fundamental geometric shape of the protective cage  12  is a truncated prism. The front side and the rear side are slanted relative to each other at an angle between, for instance, 70° and 85°. The front side and/or the rear side are slanted with respect to the first direction  21 . The side edges that connect corners of the front side and the rear side all run parallel to the first direction  21 ; in contrast to the embodiment shown in  FIG. 1 , they can be of different lengths. As in the preceding embodiment, the leg surfaces, that is to say, the side surfaces of the truncated prism that differ from the front side and the rear side, are at an angle between 60° and 80° relative to the base. 
     The front side  13  is delimited by a bent tube  28 . The tube  28  can surround the front side  13  completely or else partially as depicted in  FIG. 1 . The rear side  14  is framed by a tube that is configured like the front side  13 . The tubes  28  of the front and rear surfaces  13 ,  14  are joined to each other by means of cross struts  29 . The cross struts  29  can be arranged, for example, in the base  22 . At an upper end of the protective cage  12  located opposite from the base  22 , there can also be cross struts  30 . In the embodiment shown, the upper cross struts  30  are formed by the tube  28  that is bent parallel to the first direction  21  towards the rear side  14  and that is welded to the tube of the rear side  14 . As an alternative, the front side  13  and the rear side  14  are bent out of the same tube  28 . A plate  31  or another cross strut on the rear side  14  can join the two legs  16  to each other in order to ensure greater stiffness of the protective cage  12 . 
     A holder  32  for the chisel hammer  11  is provided on the rear side  14 . The holder  32  has a rod assembly  33  that is arranged in the plane of the rear side  14  or inside the protective cage  12  parallel to the rear side  14 . The rod assembly  33  closes the rear side  14  in such a way that the chisel hammer  11  cannot fall out of the protective cage  12 . In the embodiment of  FIG. 1 , the rod assembly  33  has essentially two rods  34  that are arranged symmetrically with respect to a second direction  35 . The second direction is perpendicular to the base  22 . A swiveling bar  36  is arranged on the rod assembly  33 . The bar  36  is oriented parallel to a third direction  37 , perpendicular to the first direction  21  and to the second direction  35 . The bar  36  is bent in the first direction  21  and can grip around a neck of the chisel hammer  11  on one side. A screwed connection  38  or a hook closure allows users to lock and unlock the bar  36  in order to secure the chisel hammer  11  in the transport cart  10 . 
     A handle  39  can be connected to the rod assembly  33 . In a preferred embodiment, the handle  39  can be telescopically sunk into the rod assembly  33  until it lies completely inside the protective cage  12 . In this manner, the dimensions of the transport cart  10  can be reduced so that it can be stowed away. Moreover, the protective cage  12  protects the handle  39  against damage. 
     Projections  40  positioned parallel to the first direction  21  can be provided on the rod assembly  33 , and they serve to additionally secure the chisel hammer  11  to the bar  36 . 
     The front side  13  is open and has only the externally delimiting frame through the tube  24 . Users can place the chisel hammer  11  into the holder  32  through the open front side  13 . 
     The transport cart  10  has two wheels  42  or castors. The axes  43  of the wheels  42  are parallel to the third direction  37 . The distance between the wheels  42  preferably amounts to at least 75% of the maximum dimension of the protective cage in the third direction  37 , as a result of which the transport cart  10  can be pulled without wobbling. The wheels  42  are mounted on the protective cage  12  by means of swiveling wheel brackets  44 . In a first position, the wheel brackets  44  are folded open. The wheels  42  project out of the protective cage  12  and the transport cart  10  can be moved by being tilted around an axis  45  of the wheels  42 . Unintentional rolling of the transport cart  10  is prevented in that the wheels  42  in the first position are at a distance of a few centimeters from the plane of the base  22 . As long as the transport cart  10  is standing on the base  22 , the wheels  42  hover a bit above the ground. In a second position of the wheel bracket  44  (shown by a broken line in  FIG. 2 ), the wheels  42  are arranged inside the protective cage  12  and are protected against damage. In an alternative embodiment, the axes  43  of the wheels  42  are parallel to the first direction  21 . 
     A swiveling arm  46  is provided on a leg surface  23 . A swivel axis  47  is in the area of an upper end  48  of the protective cage  12 . In a first position, the swiveling arm  46  is completely inside the protective cage  12 , for example, in the plane of the leg surface  23 . The swiveling arm  46  can be swiveled out to a second position in which it is at an angle  49  between 120° and 150° relative to the leg surface  23 . A blocking element prevents the swiveling arm  46  from being swiveled out any further. The swiveling arm  46  can consist of a U-shaped bent tube. The swiveling arm  46  comes into action when the transport cart  10  is loaded into the trunk of a typical European passenger car. The transport cart  10  is placed with the leg surface  23  facing the trunk of the car. The swiveling arm  46  is swiveled out and projects into the trunk. When the transport cart  10  is lifted, it can then be supported on the swiveling arm  46  and slid into the trunk on the swiveling arm  46 . 
     In a preferred embodiment, an end  50  of the swiveling arm  46  that is distal from the swivel axis  47  is angled with respect to the first direction  21 . The length of the distal end  50  amounts to about 5 cm to 10 cm, corresponding to a typical loading edge of the trunk. 
     In another embodiment, the base lines  15  and the legs  16  are configured so as to be straight. Sections of the tube  28  that connect the base line  15  to the leg  16  in the front side  13  or rear side  14  can be configured so as to be bent, for instance, without corners. The truncated corner shown in  FIG. 1  and having two partial sections  51 ,  52  could be divided into a larger number of sections. The length of the base  22  and of the leg sides  23  is defined by the straight sections of the base line  15  or of the legs  16 .