Apparatus for holding stacked trays

Abstract

An apparatus for holding stacked trays includes a cover and a hooking unit. The cover protects an upper surface of the stacked trays. The hooking unit is connected to the cover. The hooking unit is drawn from at least two side surfaces of the cover along the side surfaces of the stacked trays, to hold both lower ends of the stacked trays. Thus, the stacked trays may be easily held only by hooking the hook on the lower end of the stacked trays.

1 . An apparatus for holding stacked trays, comprising:
 a cover configured to cover an upper surface of the stacked trays; and   a hooking unit attached to the cover, the hooking unit configured to be drawn from side surfaces of the cover to run along side surfaces of the stacked trays and hook into lower ends of the stacked trays.   
   
   
       2 . The apparatus of  claim 1 , wherein the hooking unit comprises:
 a pair of drums, the drums configured to attach to the cover;   belts wound on the drums, the belts configured to be drawn from side surfaces of the cover;   hooking springs located in the drums, the hooking springs configured to impart a tensile force on the belts; and   hooks provided on the ends of the belts, the hooks configured to hook into the lower ends of the stacked trays.   
   
   
       3 . The apparatus of  claim 2 , wherein the hooking unit further comprises:
 hooking blocks on the ends of the belts, the hooks affixed to the hooking blocks.   
   
   
       4 . The apparatus of  claim 3 , wherein the hooking unit further comprises:
 hooking brackets mounted on the hooking blocks, the hooking brackets configured to fix both ends of the hooks.   
   
   
       5 . The apparatus of  claim 3 , wherein the hooking unit further comprises:
 hooking handles mounted on the hooking blocks.   
   
   
       6 . The apparatus of  claim 2 , wherein the belts are dust-free belts. 
   
   
       7 . The apparatus of  claim 1 , further comprising:
 a locking unit for locking the hooking unit.   
   
   
       8 . The apparatus of  claim 7 , wherein the locking unit comprises:
 a locking housing on the cover, the locking housing having at least two locking grooves are arranged along a vertical direction;   two locking bars movably received in the locking housing, the locking bars movable in the vertical direction and a horizontal direction, the locking bars having outer ends configured to selectively insert into the locking grooves;   locking springs connected to inner ends of the locking bars, the locking springs connected to each other by a connecting portion;   a locking button movably inserted into the locking housing in the vertical direction, the locking button selectively pressing on the connecting portion of the locking springs to release the outer ends of the locking bars from the locking grooves; and   locking rods mounted on the locking bars, the locking rods configured to press on and lock the hooking unit.   
   
   
       9 . The apparatus of  claim 8 , wherein the locking unit further comprises:
 a first locking protrusion provided on a lower surface of the locking rods, the first locking protrusion configured to press on the hooking unit; and   at least two second locking protrusions located below the hooking unit, the at least two second locking protrusions configured to form a receiving groove in which the first locking protrusion and the hooking unit are received.   
   
   
       10 . The apparatus of  claim 1 , further comprising:
 the stacked trays, wherein the stacked trays are configured to receive semiconductor packages, the stacked trays including holding protrusions formed at the side surfaces of the stacked trays, the holding protrusions configured to allow the hooking unit to hook into the protrusions.   
   
   
       11 . An apparatus for holding stacked trays, the stacked trays configured to receive semiconductor package trays and having holding protrusions formed at side surfaces of the trays; comprising:
 a cover configured to cover an upper surface of the stacked trays;   a pair of drums installed on the cover;   belts wound on the drums, the belts configured to be selectively drawn from side surfaces of the cover along side surfaces of the stacked trays;   hooking springs located in the drums, the hooking springs configured to impart a tensile force on the belts;   hooks provided on the ends of the belts, the hooks configured to hook into the lower ends of the stacked trays;   a locking housing on the cover, the locking housing having at least two locking grooves are arranged along a vertical direction;   two locking bars movably received in the locking housing, the locking bars movable in the vertical direction and a horizontal direction, the locking bars having outer ends configured to selectively insert into the locking grooves;   locking springs connected to inner ends of the locking bars, the locking springs connected to each other by a connecting portion;   a locking button movably inserted into the locking housing in the vertical direction, the locking button selectively pressing on the connecting portion of the locking springs to release the outer ends of the locking bars from the locking grooves; and   locking rods mounted on the locking bars, the locking rods configured to press on and lock the hooking unit.   
   
   
       12 . The apparatus of  claim 11 , further comprising:
 hooking blocks on the ends of the belts, the hooks affixed to the hooking blocks.   
   
   
       13 . The apparatus of  claim 12 , further comprising:
 hooking brackets mounted on the hooking blocks, the hooking brackets configured to fix both ends of the hooks.   
   
   
       14 . The apparatus of  claim 12 , further comprising:
 hooking handles mounted on the hooking blocks.   
   
   
       15 . The apparatus of  claim 11 , further comprising:
 a first locking protrusion provided on a lower surface of the locking rods, the first locking protrusion configured to press on the hooking unit; and   at least two second locking protrusions located below the hooking unit, the at least two second locking protrusions configured to form a receiving groove in which the first locking protrusion and the hooking unit are received.   
   
   
       16 . The apparatus of  claim 11 , wherein the belts are dust-free belts. 
   
   
       17 . The apparatus of  claim 2 , wherein one belt is provided for each drum, the belts being configured to be drawn along opposing sides of the stacked trays. 
   
   
       18 . The apparatus of  claim 11 , wherein one belt is provided for each drum, the belts being configured to be drawn along opposing sides of the stacked trays.