Extrusion-type liquid delivery apparatus

• US 20050220639A1
• Filed: 03/31/2005
• Published: 10/06/2005
• Est. Priority Date: 04/02/2004
• Status: Abandoned Application

• Current Assignee: Japan Servo Co., Ltd. (Nidec Corporation)
• Original Assignee: Japan Servo Co., Ltd. (Nidec Corporation)
• Inventors: Sugaya, Kenji, Sasaki, Naotaka, Ito, Hideaki, Kagawa, Yoshihisa, Kawamata, Shunichi
• Application Number:
  US11/094,277
• Publication Number:
  US 20050220639A1
• Time in Patent Office: Days
• US Class Current: 417/415
• CPC Class Codes: A61M 2205/14 Detection of the presence or absence of a tube, a connector or a container in an apparatus
• CPC Class Codes: A61M 39/28 Clamping means for squeezing flexible tubes, e.g. roller clamps tube strippers A61M1/83
• CPC Class Codes: A61M 5/1456 with a replaceable reservoir comprising a piston rod to be moved into the reservoir, e.g. the piston rod is part of the removable reservoir
• CPC Class Codes: A61M 5/1458 Means for capture of the plunger flange

Abstract

An extrusion-type liquid delivery apparatus according to the present invention comprises: a plunger mover to move a plunger; a plunger mover driver to move the plunger mover; a pair of hooks rotatably mounted on the plunger mover with the bent ends projecting from the plunger mover, and having slopes at the bent ends; a spring to close the bent ends of the pair of hooks by spring force; and a clamp to block a liquid delivery channel connected to a container.

Claims

1. An extrusion-type liquid delivery apparatus, wherein a liquid in a container having a liquid delivery portion at one end of the container is extruded by a plunger that is inserted from the other end of the container, comprising:

a) a plunger mover to move said plunger;

b) a plunger mover driver to move said plunger mover;

c) a pair of hooks rotatably mounted on said plunger mover with bent ends projecting from said plunger mover, and having slopes at said bent ends;

d) a spring to close said bent ends of said pair of hooks by spring force; and

e) a clamp to block a liquid delivery channel connected to said container.

2. The extrusion-type liquid delivery apparatus of claim 1, further comprising a manual release means to rotate said hooks against the spring force of said spring.

3. The extrusion-type liquid delivery apparatus of claim 1, further comprising a plunger grip detecting means to detect whether or not said plunger is gripped.

4. The extrusion-type liquid delivery apparatus of claim 1, further comprising a means to lower the inner pressure of said container after said hooks have gripped said plunger.

5. The extrusion-type liquid delivery apparatus of claim 4, further comprising a control device to move said plunger mover by a predetermined distance in the direction opposite to the direction of pushing said plunger, after said hooks have gripped said plunger.