Blade device

Abstract

The back face of a main blade body includes mounting parts, with a box structure having a mounting hole opened in the width direction and a cross section intersecting the width direction is non-circular. At the back face of each width expansion blade body is a fitting part, removably inserted into the mounting hole. A latching member latches the fitting part fitted in the mounting hole. For width expansion, the fitting part is fitted from the outer end side of the mounting hole to position the width expansion blade body at an end of the main blade body. For the housing, the fitting part is fitted from the inside of the mounting hole to house and position the width expansion blade body at the back face of the main blade body. In the width-expanded state, loads are received by the corresponding mounting part to lighten the burden placed on the latching member.

1 . A blade device comprising: 
 a main blade body comprising: 
 a main blade long in a width direction; and  
 mounting parts, each disposed at an end part in the width direction of a back face of the main blade and having formed therein a mounting hole open in the width direction and a cross section of the mounting hole in the direction intersecting the width direction is non-circular;  
   width expansion blade bodies comprising: 
 a width expansion blade positioned at the end part of the main blade; and  
 a fitting part disposed at a back face of the width expansion blade and inserts removably into the mounting hole;  
   wherein the width expansion blade is positioned at the end part by fitting the fitting part from an outer end side of the mounting hole; and    latching members, each detachably latching the fitting part into the mounting hole.    
   
   
       2 . The blade device according to  claim 1 , wherein the width expansion blade is positioned at the back face of the main blade by the fitting of the fitting part from an inner end side of the mounting hole of the main blade body.  
   
   
       3 . The blade device according to  claim 2 , wherein the main blade body further comprises supporting arms, each supporting an intermediate part in the width direction of the back face of the main blade body, 
 wherein the length in the width direction, including the fitting part, of each width expansion blade body is longer than the interval between a supporting arm and the inner end side of the mounting hole, and each fitting part is inserted and removed from the inner end side of the mounting hole by a change of orientation of the width expansion blade body.    
   
   
       4 . The blade device according to  claim 3 , wherein each mounting part of the main blade body comprises: 
 a back face plate of the main blade;    a pair of main blade brackets, extending from the back face plate to the supporting arm and spaced apart from each other; and    a supporting part, disposed opposite the back face plate and between the pair of main blade brackets.    
   
   
       5 . The blade device according to  claim 4 , wherein the fitting part of each width expansion blade body has a notched part to allow changing, with respect to the supporting part of the mounting part of the main blade body, of the orientation of the width expansion blade body that is inserted and removed from the inner end side of the corresponding mounting hole.  
   
   
       6 . The blade device according to  claim 1 , wherein each latching member having a single pin inserted into the mounting part of the main blade body and into the fitting part of the width expansion blade body, once fitted into the mounting hole of the mounting part.  
   
   
       7 . The blade device according to  claim 2 , wherein each latching member comprises: 
 a pin inserted into the mounting part and into the fitting part once the fitting part is fitted into the mounting hole of the mounting part; and    a rotation stopping part inserted into the mounting part and into the fitting part once the fitting part is fitted from the inner end side of the mounting hole of the mounting part.    
   
   
       8 . The blade device according to  claim 2 , wherein each latching member having a pin inserted into the mounting part of the main blade body and into the fitting part of the width expansion blade body, once fitted into the mounting hole of the mounting part.  
   
   
       9 . The blade device according to  claim 3 , wherein each latching member having a pin inserted into the mounting part of the main blade body and into the fitting part of the width expansion blade body, once fitted into the mounting hole of the mounting part.  
   
   
       10 . The blade device according to  claim 4 , wherein each latching member having a pin inserted into the mounting part of the main blade body and into the fitting part of the width expansion blade body, once fitted into the mounting hole of the mounting part.  
   
   
       11 . The blade device according to  claim 5 , wherein each latching member having a pin inserted into the mounting part of the main blade body and into the fitting part of the width expansion blade body, once fitted into the mounting hole of the mounting part.  
   
   
       12 . The blade device according to  claim 3 , wherein each latching member comprising: 
 a pin inserted into the mounting part and into the fitting part once the fitting part is fitted into the mounting hole of the mounting part; and    a rotation stopping part inserted into the mounting part and into the fitting part once the fitting part is fitted from the inner end side of the mounting hole of the mounting part.    
   
   
       13 . The blade device according to  claim 4 , wherein each latching member comprises: 
 a pin inserted into the mounting part and into the fitting part once the fitting part is fitted into the mounting hole of the mounting part; and    a rotation stopping part inserted into the mounting part and into the fitting part once the fitting part is fitted from the inner end side of the mounting hole of the mounting part.    
   
   
       14 . The blade device according to  claim 5 , wherein each latching member comprising: 
 a pin inserted into the mounting part and into the fitting part once the fitting part is fitted into the mounting hole of the mounting part; and    a rotation stopping part inserted into the mounting part and into the fitting part once the fitting part is fitted from the inner end side of the mounting hole of the mounting part.