Patent Publication Number: US-2012045296-A1

Title: Hoist

Description:
FIELD OF THE INVENTION 
     The present invention relates to a lifting equipment, in particular, to a hoist. 
     DESCRIPTION OF THE PRIOR ART 
     As a lifting equipment, the hoist includes the manual hoist and motor hoist. The hoist is widely used in various fields of the national economy. However, at present, various domestic and foreign manual hoists are unable to weigh the lifted goods, due to the fact that they only have a single function of lifting. Therefore, during the process of use, the weight of the lifted goods can only be judged according to the experience of the operator, which is apt to make the hoist have overload lifting and possible to cause the damage of the equipment and the occurrence of the safety accidents, and possible to cause the unnecessary personal damage and financial loss accordingly. 
     SUMMARY OF THE INVENTION 
     It is an object of the present invention to provide a hoist which can show the mass of the lifted goods. 
     For achieving the above stated object, the hoist comprises an upper hook and a holder for the upper hook, characterized in that: 
     the hoist also comprising a weighing device with a display which can show the weight of the upper hook bearing; 
     the first end of the weighing device jointed with the upper hook, while the second end of the weighing device jointed with the holder for the upper hook. 
     Preferably, the upper hook is rotatably jointed with the first end of the weighing device, and the second end of the weighing device is rotatably jointed with the holder for the upper hook. 
     Preferably, the weighing device comprises a hollow housing, in which a weighing sensor unit is mounted, the display is electrically connected with the weighing sensor unit, the hollow housing has a installing hole for the display, a metal shell covers the weighing sensor unit, the metal shell and the weighing sensor unit form a whole piece which has a lower linking portion and an upper linking portion, the lower linking portion has a first pin hole in which a first pin is moveably mounted, both ends of the first pin are fixed inside the holder for the upper hook, while the upper linking portion has a second pin hole in which the second pin is moveably mounted, both ends of the second pin are fixed inside a linking portion of the upper hook. 
     Preferably, the inking portion f the upper hook is in U shape. 
     Besides, the weighing device and the holder for the upper hook can form a whole piece through anti-vibration plates mounted on the holder, the anti-vibration plates have an installing hole for the display. 
     Preferably, the upper hook is moveably jointed with the whole piece which is formed by the weighing device and the holder for the upper hook. 
     The hoist which can display the value of the weight of lifted goods, can be applied not only in various manual hoists but also in various motor hoists. 
     Compared with the prior art, in this invention, a weighing device which can show the value of the weight of lifted goods, is mounted between the upper hook and the holder for the upper hook. It can avoid the possible occurrence of blind overloading due to the non-displaying of the value of the weight, and avoid the unnecessary equipment damage and even the dangerous safety accidents. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a perspective view of the first embodiment of the manual hoist of the present invention. 
         FIG. 2  is an exploded view of  FIG. 1 . 
         FIG. 3  is a perspective view of the second embodiment of the manual hoist of the present invention. 
         FIG. 4  is an exploded view of  FIG. 2 . 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     To enable a further understanding of the innovative and technological content of the invention herein, refer to the detailed description of the invention and the accompanying drawings below: 
       FIG. 1  and  FIG. 2  show a manual chain hoist as the first embodiment of the present invention. 
     In this embodiment, the manual chain hoist comprises an upper hook  1 , a weighing device  2 , a machine body  3 , an operating handle  4 , a chain  5  and a lower hook  6 . Wherein, the machine body  3  also acts as a holder for the upper hook. A gear transmission mechanism and a brake engaged with the chain are mounted inside the machine body  3 . The operating handle  4  is mounted on one side of the machine body while the lower hook  6  is mounted on one side of the chain  5 . 
     The weighing device  2  comprises a hollow housing  21 , a weighing sensor unit and a display  23 . A metal shell covers the weighing sensor unit, the metal shell and the weighing sensor unit form a whole piece  22  which is set in the hollow housing  21 . The display  23  is electrically connected with the weighing sensor unit. The hollow housing  21  has a installing hole for the display  23 . 
     In this embodiment, the weighing sensor unit can use the conventional electronic weighing sensor or the mechanical weighing sensor in the prior art. The weighing units can be divided into kilogram, ton, pound, newton, kilo-newton and so on according to the specific weighing sensor units. 
     The upper hook  1  comprises a hook portion  11  and a linking portion  12 . The hook portion  11  and the linking portion  12  are jointed with each other rotatably in 360-degree. The whole part of the linking portion  12  is located inside the hollow housing  21  and the end of the linking portion  12  is in U-shape. The first end of the hollow housing  21  has a through hole  211  for the linking portion  12  to pass through moveably. The lower linking portion  221  of the whole piece  22  has a first pin hole  222  in which a first pin  31  is moveably mounted, both ends of the first pin  31  are fixed inside the holder  3  for the upper hook, while the upper linking portion  223  of the whole piece  22  has a second pin hole  224  in which the second pin  13  is moveably mounted, both ends of the second pin  13  are fixed inside the U-shaped linking portion  12  of the upper hook  1 . 
       FIG. 3  and  FIG. 4  show the second embodiment of the present invention. 
     The difference of this embodiment compared with the first embodiment is that the weighing device  2  is not externally equipped with a hollow housing as the first embodiment. While, the weighing device  2  and the machine body  3  are connected as an integrated part through four anti-vibration plates  7  which form into a hollow housing. The anti-vibration plates  7  have a installing hole for installing the display.