Fluid subdividing and filling device, and piston and clamp used in the same

Abstract

A fixing member is fixed on a structure for moving a piston forward and backward. Piston clamps rotatably face the fixing member, and an elastic body biases the piston clamps forward. A holding unit for holding detachably the rear end of the piston shaft is formed on both ends of the piston clamps. Tapers expanding gradually in the forward direction are formed on the surface opposite to the top end of the holding unit. An elastic body to which the rear end of the piston shaft is brought into contact. An opening member with tapers guides upward the tapers at the top of the piston clamp holding unit. The fixing member moves forward causing the piston clamps to move forward further. The piston shaft compresses the elastic body. The tapers at the top of the piston clamps holding unit open and the piston shaft and the piston clamps separate.

1 . A fluid subdividing and filling device in which a piston is moved backward to fill a fluid to be subdivided and filled into a cylinder, and the piston is moved forward to discharge said fluid, characterized in that a rear end portion of a piston body fitted slidably in said cylinder is formed to be somewhat smaller so that a short cylindrical seal is fitted, said short cylindrical seal is formed to have a taper in which an end inner circumference of a short cylindrical plate is spread open, a shoulder portion of the cylinder in contact with said taper is formed in a taper that rises in the forward direction, a short cylindrical seal holder is fitted from backward of said short cylindrical Teflon seal, said short cylindrical Teflon seal is pressed forward, whereby the extreme end of said short cylindrical Teflon seal is projected somewhat from a piston body outer circumference.  
   
   
       2 . The fluid subdividing and filling device according to  claim 1  comprising a fixed quantity cut-down pump body having an suction opening in communication with an lower-end opening of a liquid food accommodating container for subdividing and filling and a discharge opening to a subdividing and filling container, a cylinder turnably fitted in the fixed quantity cut-down pump body, a piston sidably fitted in the cylinder, and a through-hole formed in the cylinder, wherein rotation of the cylinder and advance/backward movement of the piston are coupled so that the through-hole of the cylinder is communicated with the suction opening of the fixed quantity cut-down pump body, the piston moves back to fill a fixed quantity of liquid food into the cylinder whereas when the through-hole of the cylinder is communicated with the discharge opening of the apparatus body, the piston advances to discharge liquid food from the discharge opening communicated  
   
   
       3 . The fluid subdividing and filling apparatus according to  claim 2  wherein the discharge opening of the apparatus body is fitted with a cylindrical Teflon seal formed in a curved surface whose top can get into a tight contact with said cylinder and the top opening of said Teflon seal is brought into tight contact with the cylinder to cover said through hole.  
   
   
       4 . A piston wherein the rear end portion of a piston body fitted slidably in said cylinder is formed to be somewhat smaller so that a short cylindrical seal is fitted, said short cylindrical seal is formed to have a taper in which an end inner circumference of a short cylindrical plate is spread open, a shoulder portion of the cylinder in contact with said taper is formed in a taper that rises in the forward direction, a short cylindrical seal holder is fitted from backward of said short cylindrical Teflon seal, said short cylindrical Teflon seal is pressed forward, whereby the extreme end of said short cylindrical Teflon seal is projected somewhat from a piston body outer circumference.  
   
   
       5 . The piston according to  claim 4  wherein the top of said piston body is formed in a convex gentle curved shape.  
   
   
       6 . The piston according to  claim 5  wherein a concave tapped hole is formed on the rear end surface of the body of said piston, the top of the piston shaft is screwed into said tapped hole and a nut that had been screwed on said piston shaft is further screwed and clamped fast to press the rear end surface of said seal holder that had been fitted on the piston shaft.  
   
   
       7 . A fluid subdividing and filling device for filling the cylinder with fluid to be subdivided and filled by making the piston move backward and for discharging said fluid by making the piston move forward, comprising a fixing member fixed on the means for making the piston move forward and backward, a piston clamp rotatably fixed on the opposite side of said fixing member, an elastic body for giving impetus to said piston clamp to move forward in the closing direction, a holding unit for holding detachably the rear part of a piston shaft formed on both ends of said piston clamps, a taper expanding gradually forward formed in the surface opposite to said holding unit, an elastic body to which the rear end of said piston shaft enters into contact directly or through other members, and an opening member having tapers guiding upward in such a way that the top tapers of the holding unit of said piston clamps may open, wherein a forward movement of said fixing member resulting in a forward movement of the piston clamps further forward beyond the limit of forward movement leads to the compression of said elastic body by said piston shaft, and the tapered top of said holding unit of said piston clamps, being guided in contact with the taper of said opening member, opens leading to the separation of the piston shaft and the piston clamp.  
   
   
       8 . A clamp for linking the piston shaft and the means for making the piston move forward and backward comprising a fixing member fixed on the means for making the piston move forward and backward, a piston clamp fixed rotatably facing said fixing member, an elastic body giving impetus to said piston clamp forward in the closing direction, a holding unit for holding detachably the rear end of the piston shaft formed on both ends of said piston clamp, a taper expanding gradually forward formed on the opposite surface to the top of said holding unit, an elastic body to which the rear end of said piston shaft is in contact directly or through another member, and an opening member with a taper guiding upward opens the top taper of the holding unit of said piston clamps, wherein a forward movement of said fixing member resulting in a forward movement of the piston clamp further beyond the limit of forward movement leads to the compression of said elastic body by said piston shaft, and the tapered top of said holding unit of said piston clamp, being guided in contact with the taper of said opening member, opens leading to the separation of the piston shaft and the piston clamps.  
   
   
       9 . The clamp according to  claim 8  wherein the means for making said piston move forward and backward is a rack gear engaged with a pinion fixed on the rotating shaft of the motor.  
   
   
       10 . The clamp according to  claim 9  wherein said piston clamp and said fixing member are rotatably fixed behind the center of the piston clamp and an elastic body for giving impetus to the piston clamp forward in the closing direction taking the fixing point as an a supporting point is placed between the piston clamps behind said supporting point and said fixing member.  
   
   
       11 . The clamp according to claims  10  wherein a housing unit for housing the elastic body is formed in front of said fixing member, a piston shaft extruder given impetus by said elastic body is placed in the opening in front of said housing unit and the rear end part of said piston shaft is brought into contact with said piston shaft extruder,