1. A mixing assembly for mixing solutions within a biochemical analyzer, the assembly comprising:
a sampling probe needle depending from a moveable arm;
an electromagnet proximate a ferromagnetic plate attached to the moveable arm for reciprocating the moveable arm in a first direction;
a foot protruding from the moveable arm, the foot having a pin extending vertically upwards; and,
a curved surface mounted to a stationary block and positioned in contact with said pin, whereby reciprocating the moveable arm in the first direction causes the pin to roll along the curved surface, whereby the moveable arm is reciprocated in a second direction perpendicular to said first direction.
2. The mixing assembly of claim 1 wherein the movement in the second direction is generally larger than movement in the first direction, thereby causing the probe needle to be moved in a generally ellipsoidal mixing pattern.
3. The mixing assembly of claim 1 wherein the movement in the second direction is generally twice as large as the dimension of movement in the first direction, thereby causing the probe needle to be moved in a generally \u201cboomerang-shaped\u201d mixing pattern.
4. The mixing assembly of claim 1 wherein the curved surface is a roller bearing or a stationary pin.
5. The mixing assembly of claim 1 wherein the distance between the electromagnet and the plate is adjusted to maintain the displacement of the probe needle to be within a range of about 0.6 to about 1.2 mm.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A door structure of an electric rail car comprising:
a door frame having an opening thereinside;
a guide rail guiding an opening and a closing of the door frame; and
a sealing device inserted into the opening, descending to make contact with the guide rail when the door frame is closed, and ascending to be spaced apart from the guide rail when the door frame is open.
2. The door structure of claim 1, further comprising:
a first magnet disposed at a side of the sealing device; and
a second magnet disposed a side of the guide rail,
wherein the sealing device descends due to attraction between the first and second magnets.
3. The door structure of claim 1, further comprising:
an electric body having first and second ends, the first end being connected to the side of the sealing device, the second end being connected to a side of the door frame,
wherein the sealing device ascends due to a restoring force of the electric body generated when the sealing device descends.
4. The door structure of claim 1, wherein the door frame comprises an outer wall and an inner wall, and the sealing device comprises at least one protrusions which move outside of the door frame through a gap between the outer and inner walls.
5. The door structure of claim 4, wherein the protrusion comprises an electric material to tightly adhere to the outer and inner walls when moving, and tightly adheres to the guide rail when the door frame is closed.
6. The door structure of claim 4, wherein two protrusions are formed along a vertical direction substantially parallel with an extending direction of the door frame, and make contact with the guide rail when the door frame is closed.
7. The door structure of claim 2, wherein a plurality of first magnets and a plurality of second magnets are disposed along an opening and closing direction of the door frame, and the first magnets and the second magnets are respectively disposed to face with each other such that the attraction is generated when the first and second magnets are respectively arranged to face with each other.
8. The door structure of claim 7, wherein an opening speed of the door frame is determined such that the attraction between the first and second magnets is negligible when the door frame is opening.