Manual liquid pump

Abstract

A manual liquid pump has a drawing device, a connecting tube, an outlet gun and a detecting device. The drawing device is inserted into a container to draw liquids and has a caution shaft. The connecting tube has an inner and outer pipe. The inner pipe is mounted in the outer pipe and is connected to and actuates the caution shaft. The outlet gun has a returning valve being selectively actuated to close and prevent liquid from flowing through the outlet gun, instead forcing the liquid down the inner pipe and actuating the caution shaft to warn users to stop pumping. The detecting device is mounted in the nozzle and actuates the return valve when a liquid level is too high to prevent overfilling and spillage for safer operation.

1 . A manual liquid pump having
 a drawing device having
 a body; 
 a drawing mount being formed on the body and having
 a top; 
 a bottom being formed on the body; 
 a sidewall; 
 an internal surface; 
 a chamber being defined in the drawing mount; 
 a rod hole being formed in the top of the drawing mount and communicating with the chamber; 
 two drawing holes being formed in the bottom of the drawing mount and communicating with the chamber and the body; 
 a dovetail groove being formed in the bottom of the drawing mount near the drawing holes; 
 a shaft hole being formed in the top of the drawing mount and communicating with the chamber; 
 an output tube being foamed on and protruding from the sidewall of the drawing mount and communicating with the chamber; and 
 a pivotal recess being formed in the internal surface of the drawing mount near the output tube; 
 
 a piston rod being movably mounted in the body and the drawing mount and having
 an inner end extending into the body through the rod hole and into the chamber of the drawing mount; 
 an outer end extending out of the top of the drawing mount from the rod hole; 
 an external surface; and 
 an operating head bring formed on the outer end of the piston rod to allow the piston rod to be moved up or down relative to the drawing mount and the body; 
 
 a pushing block being mounted securely in the drawing mount and having
 a top; 
 a bottom; 
 a sidewall; 
 an inserting hole being formed in the top of the pushing block; 
 a pushing axle being movably mounted in the inserting hole of the pushing block and having a top end; and 
 a returning conduit being formed on and protruding from the sidewall of the pushing block and aligning with the output tube of the drawing mount; 
 
 a pivot seat being pivotally mounted in the drawing mount, abutting the pushing block and having
 a top; 
 a bottom; 
 a mounting segment being defined in the bottom of the pivot seat and being pivotally mounted in the mounting recess of the drawing mount; 
 an engaging hole being formed through the top and the bottom of the pivot seat and being mounted around the piston rod; 
 a pushing segment being defined in the top of the pivot seat and abutting the top end of the pushing axle of the pushing block; and 
 a lifting segment being defined in the bottom of the pivot seat opposite to the mounting segment and aligning with the shaft hole of the drawing mount; and 
 
 a caution shaft being mounted in the chamber of the drawing mount, abutting the pivot seat and having
 a lower end abutting the lifting segment of the pivot seat to hold the caution shaft in the chamber of the drawing mount; and 
 an upper end being mounted in the shaft hole of the drawing mount; 
 
   a connecting tube being connected to the drawing device and having
 a distal end; 
 an outer pipe being connected to the drawing mount of the drawing device and having
 a rear end being mounted around the output tube of the drawing mount and communicating with the chamber of the drawing mount and the body; and 
 a front-end; and 
 
 an inner pipe being mounted in the outer pipe and being connected to the pushing block of the drawing device and having
 a rear end being mounted in the returning conduit of the pushing block through the output tube and communicating with the inserting hole of the pushing block; and 
 a front end; 
 
   an outlet gun being connected to the distal end of the connecting tube and having
 a rear end; 
 a middle; 
 a front end; 
 a handle being formed in the rear end of the outlet gun and being mounted around the front end of the outer pipe of the connecting tube; 
 an interior being defined in the middle of the outlet gun and receiving the front ends of the outer pipe and the inner pipe; and 
 a nozzle being formed in the front end of the outlet gun; and 
   a detecting device being mounted in the outlet gun and having
 a mounting jacket being mounted in the interior of the outlet gun, being connected to the outer pipe of the connecting tube and having
 a rear end; 
 a front end; 
 an external surface; 
 an attachment tube being formed on the rear end of the mounting jacket and mounted in the front end of the outer pipe; 
 a mounting chamber being defined in the mounting jacket near the front end and communicating with the attachment tube and the inner pipe extending into the mounting chamber of the mounting jacket; 
 a gap being formed through the external surface of the mounting jacket in the front end and communicating with the mounting chamber; and 
 a hook being formed on and protruding from the external surface of the mounting jacket near the rear end and aligning with the gap; 
 
 a returning seat being mounted in the mounting jacket, being connected to the inner pipe of the connecting tube and having
 a center; 
 a central tube being formed on the center of the returning seat and communicating with the attachment tube and the mounting chamber of the mounting jacket and being mounted in the front end of the inner pipe; and 
 multiple fins being parallelly formed around the central tube at even intervals; 
 
 a returning valve being connected to the mounting jacket and having
 a base being connected to the front end of the mounting jacket and having
 an inner end being mounted in the mounting chamber of the mounting jacket; 
 an outer end; 
 an external surface; 
 a through hole being formed through the base and communicating with the mounting chamber of the mounting jacket; 
 a pivot hole being formed through the base and communicating with the through hole; and 
 a slit being formed through the external surface of the base and communicating with the through hole and the pivot hole and aligning with the gap of the mounting jacket; 
 
 a cover being pivotally connected to the inner end of the base to selectively close the through hole of the base; and 
 a pivot shaft being mounted in the pivot hole of the base; 
 
 an actuating element being pivotally connected to the returning valve and having
 a connecting end passing through the through hole of the base and being connected to the cover; 
 a middle being mounted in the slit of the base and being pivotally connected to the pivot shaft; and 
 a mounting end extending out of the outer end of the base; 
 
 a returning spring being attached to the mounting jacket and the actuating element and having two ends, one of the ends being mounted on the hook of the mounting jacket and the other end being mounted on the mounting end of the actuating element; 
 a flow pipe being mounted in the nozzle of the outlet gun, being connected to the returning valve and the holding panel of the nozzle and having
 a rear end being mounted around the outer end of the base of the returning valve; and 
 a front end; and 
 
 a floating shaft being movably mounted in the nozzle of the outlet gun parallel the flow pipe and having
 an inner end being mounted in the nozzle near the outer end of the base and abutting the actuating element near the mounting end; and 
 an outer end. 
 
   
   
   
       2 . The manual liquid pump as claimed in  claim 1 , wherein
 the body further has
 a drawing barrel having
 a top; 
 a bottom; 
 a center; and 
 a drawing pipe being formed on the bottom of the drawing barrel; and 
 
 a mounting ring being hollow, being detachably connected to the drawing barrel and having
 a bottom being detachably mounted around the top of the drawing barrel; and 
 a top; 
 
   the bottom of the drawing mount is formed on the top of the mounting ring;   the rod hole aligns with the center of the drawing barrel;   the drawing holes communicate with the drawing barrel; and   the piston rod further has a check valve being connected to the inner end of the piston rod and being mounted between the drawing barrel and the mounting ring.   
   
   
       3 . The manual liquid pump as claimed in  claim 2 , wherein
 the cover further has
 a bottom face facing the through hole of the base; and 
 two guiding tracks being formed parallelly on the bottom face of the cover; 
   the actuating element is a number-3 shaped and further has
 two guiding posts being formed on the connecting end and being movably mounted in guiding tracks of the cover; and 
 a circular hole being formed through the middle of the actuating element and being mounted around the pivot shaft. 
   
   
   
       4 . The manual liquid pump as claimed in  claim 3 , wherein
 the nozzle further has
 a free end; 
 an opening being defined in the free end of the nozzle and communicating with the interior; and 
 a holding panel being semicircular and being mounted in the opening of the nozzle and having a holding hole being formed in the holding panel; 
   the front end of the flow pipe is mounted in the holding hole of the holding panel; and   the outer end of the floating shaft extends to the free end of the nozzle.   
   
   
       5 . The manual liquid pump as claimed in  claim 4 , wherein the caution shaft further has a mounting spring being mounted around the caution shaft between the internal surface of the drawing mount and the lower end of the caution shaft. 
   
   
       6 . The manual liquid pump as claimed in  claim 1 , wherein
 the cover further has
 a bottom face facing the through hole of the base; and 
 two guiding tracks being formed parallelly on the bottom face of the cover; 
   the actuating element is a number 3 shaped and further has
 two guiding posts being formed on the connecting end and being movably mounted in guiding tracks of the cover; and 
 a circular hole being formed through the middle of the actuating element and being mounted around the pivot shaft. 
   
   
   
       7 . The manual liquid pump as claimed in  claim 1 , wherein
 the nozzle further has
 a free end; 
 an opening being defined in the free end of the nozzle and communicating with the interior; and 
 a holding panel being semicircular and being mounted in the opening of the nozzle and having a holding hole being formed in the holding panel; 
   the front end of the flow pipe is mounted in the holding hole of the holding panel; and   the outer end of the floating shaft extends to the free end of the nozzle.   
   
   
       8 . The manual liquid pump as claimed in  claim 1 , wherein the caution shaft further has a mounting spring being mounted around the caution shaft between the internal surface of the drawing mount and the lower end of the caution shaft. 
   
   
       9 . The manual liquid pump as claimed in  claim 6 , wherein
 the nozzle further has
 a free end; 
 an opening being defined in the free end of the nozzle and communicating with the interior; and 
 a holding panel being semicircular and being mounted in the opening of the nozzle and having a holding hole formed in the holding panel; 
   the front end of the flow pipe is mounted in the holding hole of the holding panel; and   the outer end of the floating shaft extends to the free end of the nozzle.   
   
   
       10 . The manual liquid pump as claimed in  claim 6 , wherein the caution shaft further has a mounting spring being mounted around the caution shaft between the internal surface of the drawing mount and the lower end of the caution shaft. 
   
   
       11 . The manual liquid pump as claimed in  claim 7 , wherein
 the body further has
 a drawing barrel having
 a top; 
 a bottom; 
 a center; and 
 a drawing pipe being formed on the bottom of the drawing barrel; and 
 
 a mounting ring being hollow, being detachably connected to the drawing barrel and having
 a bottom being detachably mounted around the top of the drawing barrel; and 
 a top; 
 
   the bottom of the drawing mount is formed on the top of the mounting ring;   the rod hole aligns with the center of the drawing barrel;   the drawing holes communicate with the drawing barrel; and   the piston rod further has a check valve being connected to the inner end of the piston rod between the drawing barrel and the mounting ring.   
   
   
       12 . The manual liquid pump as claimed in  claim 7 , wherein the caution shaft further has a mounting spring being mounted around the caution shaft between the internal surface of the drawing mount and the lower end of the caution shaft.