Telescopic pump

Abstract

A telescopic pump includes a bellow, a cover and a rod. The bellow includes a first end, a second end and a compressible space in communication with exterior of the bellow via the first end. The cover includes a channel in communication with the first end of the bellow. The rod is connected to the second end of the bellow so that the rod is operable to move the bellow between an extended position and a compressed position. The second end of the bellow is far from the first end of the bellow to enlarge the compressible space to suck fluid into the compressible space in the extended position. The second end of the bellow is close to the first end of the bellow to reduce the compressible space to expel the fluid from the compressible space in the compressed position.

1 . A telescopic pump comprising:
 a bellow comprising a first end, a second end and a compressible space in communication with exterior of the bellow via the first end;   a cover comprising a channel in communication with the first end of the bellow; and   a rod connected to the second end of the bellow so that the rod is operable to move the bellow between an extended position and a compressed position, wherein the second end of the bellow is far from the first end of the bellow to enlarge the compressible space to suck fluid into the compressible space in the extended position, wherein the second end of the bellow is close to the first end of the bellow to reduce the compressible space to expel the fluid from the compressible space in the compressed position.   
     
     
         2 . The telescopic pump according to  claim 1 , wherein the channel of the cover comprises a first open end in communication with the first end of the bellow. 
     
     
         3 . The telescopic pump according to  claim 2 , wherein the channel of the cover comprises a second open end via which the channel is in communication with the exterior of the telescopic pump. 
     
     
         4 . The telescopic pump according to  claim 2 , wherein the channel of the cover comprises a second open end to allow fluid to travel out of the bellow and a third open end to allow the fluid to travel into the bellow. 
     
     
         5 . The telescopic pump according to  claim 4 , further comprising:
 a first check valve inserted in the first open end of the channel of the cover to only allow the fluid to travel into the bellow via the first open end; and   a second check valve inserted in the second open end of the channel of the cover to only allow the fluid to travel out of the bellow via the second open end.   
     
     
         6 . The telescopic pump according to  claim 5 , wherein the cover further comprises:
 a transverse connecting portion extending around a portion of the channel near the open end; and   a protrusion extending around a portion of the channel near the second open end.   
     
     
         7 . The telescopic pump according to  claim 6 , further comprising a tubular element formed with an end connected to the transverse connecting portion of the cover. 
     
     
         8 . The telescopic pump according to  claim 7 , further comprising a filter inserted in and located between the tubular element and transverse connecting portion. 
     
     
         9 . The telescopic pump according to  claim 1 , further comprising a handle connected to the rod, opposite to the bellow. 
     
     
         10 . The telescopic pump according to  claim 9 , wherein the rod comprises a first end connected to the handle and a second end connected to the second end of the bellow. 
     
     
         11 . The telescopic pump according to  claim 1 , further comprising a shell for containing the bellow. 
     
     
         12 . The telescopic pump according to  claim 11 , wherein the cover is connected to the shell. 
     
     
         13 . The telescopic pump according to  claim 12 , wherein the shell comprises a front open end connected to the cover and a rear open end for receiving the rod to guide the rod to move smoothly relative to the shell. 
     
     
         14 . The telescopic pump according to  claim 13 , wherein the cover comprises a longitudinal connecting portion connected to the front open end of the shell. 
     
     
         15 . The telescopic pump according to  claim 11 , wherein the shell comprises a window via which the bellow is visible. 
     
     
         16 . The telescopic pump according to  claim 15 , wherein the shell further comprises a scale near and along the window. 
     
     
         17 . The telescopic pump according to  claim 16 , wherein the bellow further comprises an indicator visible through the window so that the position of the indicator relative to the scale is used to determine the volume of the compressible space.