Vacuum machine, compressor, and piston

Abstract

A vacuum machine includes: a crankcase; a cylinder body fixed to the crankcase; a cylinder head fixed to a distal end of the cylinder body; and a piston reciprocating within the cylinder body, wherein the piston includes: a piston rod; a piston head fixed to a distal end of the piston rod and defining a chamber in cooperation with the cylinder body and the cylinder head; and a check valve arranged within a space formed between the piston rod and the piston head, the piston rod and the piston head each includes a through-hole communicating with the space, and the check valve is elastically deformable within the space so as to open and close one of the through holes of the piston rod and the piston head.

What is claimed is: 
     
         1 . A vacuum machine comprising:
 a crankcase;   a cylinder body fixed to the crankcase;   a cylinder head fixed to a distal end of the cylinder body;   and a piston reciprocating within the cylinder body,   wherein the piston includes:
 a piston rod; a piston head fixed to a distal end of the piston rod and defining a chamber in cooperation with the cylinder body and the cylinder head; and 
 a check valve arranged within a space formed between the piston rod and the piston head, 
   the piston rod and the piston head each includes a through-hole communicating with the space, and   the check valve is elastically deformable within the space so as to open and close one of the through holes of the piston rod and the piston head.   
     
     
         2 . The vacuum machine of  claim 1 , wherein the check valve abuts with the one of the piston rod and the piston head to close the one of the through holes of the piston rod and the piston head, and is elastically deformed away from the one of the through holes of the piston rod and the piston head and closer to the other one of the through holes of the piston rod and the piston head to open the one of the through holes of the piston rod and the piston head. 
     
     
         3 . The vacuum machine of  claim 1 , wherein
 the check valve is fixed to the one of the piston rod and the piston head by a fixation member, and   the other one of the through-holes of the piston rod and the piston head releases the fixation member.   
     
     
         4 . The vacuum machine of  claim 1 , wherein
 the cylinder head includes a partition wall portion defining the chamber in cooperation with the piston head,   the partition wall portion is formed with a communication hole communicating with the chamber, an opening and closing member opening and closing the communication hole being fixed to the partition wall portion by a cylinder side fixation member, and   the through-hole of the piston head releases the cylinder side fixation member projecting in the chamber in accordance with reciprocation of the piston head.   
     
     
         5 . A compressor comprising:
 a crankcase;   a cylinder body fixed to the crankcase;   a cylinder head fixed to a distal end of the cylinder body;   and a piston reciprocating within the cylinder body,   wherein the piston includes:
 a piston rod; a piston head fixed to a distal end of the piston rod and defining a chamber in cooperation with the cylinder body and the cylinder head; and 
 a check valve arranged within a space formed between the piston rod and the piston head, 
   the piston rod and the piston head each includes a through-hole communicating with the space, and   the check valve is elastically deformable within the space so as to open and close one of the through holes of the piston rod and the piston head.   
     
     
         6 . The compressor of  claim 5 , wherein the check valve abuts with the one of the piston rod and the piston head to close the one of the through holes of the piston rod and the piston head, and is elastically deformed away from the one of the through holes of the piston rod and the piston head and closer to the other one of the through holes of the piston rod and the piston head to open the one of the through holes of the piston rod and the piston head. 
     
     
         7 . The compressor of  claim 5 , wherein
 the check valve is fixed to the one of the piston rod and the piston head by a fixation member, and   the other one of the through-holes of the piston rod and the piston head releases the fixation member.   
     
     
         8 . The compressor of  claim 5 , wherein
 the cylinder head includes a partition wall portion defining the chamber in cooperation with the piston head,   the partition wall portion is formed with a communication hole communicating with the chamber, an opening and closing member opening and closing the communication hole being fixed to the partition wall portion by a cylinder side fixation member, and   the through-hole of the piston head releases the cylinder side fixation member projecting in the chamber in accordance with reciprocation of the piston head.   
     
     
         9 . A piston comprising:
 a piston rod;   a piston head fixed to a distal end of the piston rod; and   a check valve arranged within a space formed between the piston rod and the piston head,   wherein the piston rod and the piston head each includes a through-hole communicating with the space, and   the check valve is elastically deformable within the space so as to open and close one of the through holes of the piston rod and the piston head.