Umbrella skeleton

Abstract

An umbrella skeleton has a major shaft and an umbrella frame, and the umbrella frame includes a connection member, a middle runner, a lower runner, a spring, a sleeve, multiple ribs, multiple first stretchers and second stretchers. Besides the normal function of the umbrella, the umbrella skeleton can be assembled by hand conveniently without any rivets and iron wires. Moreover, most elements can be made of plastic.

1 . An umbrella skeleton comprising a major shaft ( 10 ) and an umbrella frame ( 20 ), wherein 
 a button ( 12 ) is provided on a lower part of the major shaft ( 10 );    the umbrella frame ( 20 ) includes a connection member ( 21 ), a sleeve ( 22 ), a middle runner ( 23 ), a spring ( 24 ), a lower runner ( 25 ), multiple ribs ( 26 ), multiple first stretchers ( 27 ), and multiple second stretchers ( 28 ), wherein the quantities of the ribs ( 26 ), the first stretchers ( 27 ), and the second stretchers ( 28 ) are the same;    the connection member ( 21 ) is mounted in an upper end of the major shaft; the middle runner ( 23 ) and the lower runner ( 25 ) are mounted around the major shaft ( 10 ) and below the connection member ( 21 ); a clamp hole ( 253 ) is defined in a lower part of the lower runner ( 25 ), the sleeve ( 22 ) is provided between the connection member ( 21 ) and the middle runner ( 23 ), and the spring ( 24 ) is mounted around the major shaft ( 10 ) and below the middle runner ( 23 );    one near end of each rib ( 26 ) is received in the connection member ( 21 ), each first stretcher ( 27 ) is pivotally mounted between the middle runner ( 23 ) and a respective rib ( 26 ), and each second stretcher ( 28 ) is pivotally mounted between the lower runner ( 25 ) and a respective first stretcher ( 27 ).    
   
   
       2 . The umbrella skeleton as claimed in  claim 1 , wherein the connection member has a plurality of flexible connection rods ( 211 ) corresponding to the ribs ( 26 ), and each connection rod ( 211 ) has an aperture ( 212 ) to receive a corresponding rib ( 26 ).  
   
   
       3 . The umbrella skeleton as claimed in  claim 1 , wherein each first stretcher ( 27 ) has a first pivot member ( 271 ) with a first pivot stub ( 273 ) formed in one end of the first stretcher ( 27 ), a second pivot member ( 272 ) with a second pivot stub ( 274 ) formed in the other end; the middle runner ( 23 ) has multiple first connection slots ( 231 ) defined equidistantly corresponding to the first stretchers ( 27 ), each first connection slot ( 231 ) has two inner walls, and a first pivot hole ( 232 ) is defined between the inner walls; two tabs ( 264 ) formed in each rib ( 26 ), each of the tabs ( 264 ) has a second pivot hole ( 265 ), whereby a respective first stretcher is pivotally mounted thereon.  
   
   
       4 . The umbrella skeleton as claimed in  claim 1 , wherein each second stretcher ( 28 ) is mounted between the lower runner ( 25 ) and a corresponding first stretcher ( 27 ); 
 a first hook member ( 281 ) formed in one end of each second stretcher ( 28 ), and a second hook member ( 282 ) formed in the other end of each second stretcher ( 28 ), each first hook member ( 281 ) clips on a first pivot rod ( 252 ) of the lower runner ( 25 ), and each second hook member ( 282 ) clips on a second pivot rod ( 276 ) of the respective first stretcher ( 27 ).    
   
   
       5 . The umbrella skeleton as claimed in  claim 4  wherein each first and second hook member ( 281 , 282 ) respectively has a flange formed therein.  
   
   
       6 . The umbrella skeleton as claimed in  claim 1  wherein the lower runner ( 25 ) has a recess ( 254 ) defined in a top face to secure a bottom of the spring ( 24 ).  
   
   
       7 . The umbrella skeleton as claimed in  claim 1 , wherein each rib is a long shaft.  
   
   
       8 . The umbrella skeleton as claimed in  claim 1 , wherein each rib ( 26 ) includes a tube ( 261 ), and a pole ( 262 ) hidden in the tube ( 261 ), the tube ( 261 ) has an inserted member ( 263 ) in one end which is received in the aperture ( 212 ) of the connection rod, and two tabs ( 264 ) are formed in the other end of the tube ( 261 ).