Peristaltic pumphead and methods for assembly thereof
A peristaltic pump may include a rotor rotatably mounted on a base and an occlusion bed mounted on the base and moveable toward and away from the rotor. The peristaltic pump may also include a lid hingedly mounted to the base along a first hinge axis including a mounting bracket extending perpendicularly relative to the first hinge axis. A linkage assembly connecting the occlusion bed and the lid may include a pair of curved arms hingedly mounted to the mounting bracket along a second hinge axis parallel to the first hinge axis and a cam connecting the pair of curved arms and having a cam surface facing the mounting bracket, the cam being hingedly mounted to the occlusion bed at an end opposite the second hinge axis. The mounting bracket abuts the cam surface and form a cooperative connection between the lid and the occlusion bed via the linkage assembly.
1. A peristaltic pump, comprising:
a rotor rotatably mounted on a base of the peristaltic pump;
an occlusion bed mounted on the base of the peristaltic pump and moveable toward and away from the rotor;
a lid hingedly mounted to the base of the peristaltic pump along a first hinge axis, the lid including a mounting bracket extending perpendicularly relative to the first hinge axis; and
a linkage assembly comprising:
a pair of curved arms hingedly mounted to the mounting bracket at a first end of each of the pair of curved arms about a second hinge axis parallel to the first hinge axis; and
a cam connecting each of the pair of curved arms to the other and having a cam surface facing the mounting bracket, the cam being hingedly mounted to the occlusion bed at a second end of each of the pair of curved arms, the second end of each of the curved arms being opposite to the first end;
wherein, when the lid is in a closed position, the mounting bracket extends between the pair of curved arms to abut the cam surface and form a cooperative connection between the lid and the occlusion bed via the linkage assembly.
2. The peristaltic pump of claim 1 , further comprising:
a pair of pivoting tubing retainers engaged within a retainer housing opposite the first hinge axis, each tubing retainer including:
a cross-sectionally V-shaped contact portion that engages a tube between an opening in the contact portion and a wall within the retainer housing so as to restrict movement of the tube, wherein each of the pair of pivoting tubing retainers is biased to pivot the contact portion toward the respective wall;
a curved portion that at least partially encircles a shaft in the pumphead housing about which the pivot occurs;
an extending end radially distal to the V-shaped contact portion that includes a gripping surface that allows manual pivoting of the tubing retainer in a direction opposite the biasing so as to reach an open position; and
a biased end opposite the extending end that engages a biasing element.
3. The peristaltic pump of claim 1 , further comprising a lid sensor configured to detect whether the lid is in the closed position and enable rotation of the rotor when the lid is in the closed position.
4. The peristaltic pump of claim 1 , wherein the linkage assembly is formed of a plastic.
5. The peristaltic pump of claim 1 , wherein the linkage assembly is formed of glass filled nylon.
6. The peristaltic pump of claim 1 , wherein the linkage assembly is aligned with an axis of rotation of the rotor.
7. The peristaltic pump of claim 1 , wherein the cam extends across at least half of a width of the occlusion bed.
8. The peristaltic pump of claim 1 , wherein the cam is hingedly mounted to the center of the occlusion bed between bosses protruding from the occlusion bed.
9. The peristaltic pump of, claim 1 , wherein the mounting bracket comprises a boss connected to a top surface and a rear wall of the lid.
10. The peristaltic pump of claim 1 , wherein the cam is mounted to the occlusion bed via a hinge.
11. The peristaltic pump of claim 1 , wherein the hinge includes a through hole in the cam that retains a hinge pin that is also retained within the occlusion bed.
12. The peristaltic pump of claim 1 , wherein each of the pair of curved arms has a concave aspect facing toward the base.
13. A method of assembling a peristaltic pump, comprising:
mounting a rotor on a molded base of the peristaltic pump, the base including a rotor receiving opening, a pair of elongated slots, and at least one cylindrical hinge portion;
slidably mounting an occlusion bed on the base though the slots;
inserting a first pivot pin along a first hinge axis through the at least one cylindrical hinge portion and corresponding cylindrical hinge portion of a lid, the lid including a mounting, bracket extending perpendicularly relative to the first hinge axis;
inserting a second pivot pin along a second hinge axis parallel to the first hinge, axis through the mounting bracket and through a first end of each of a pair of curved arms of a linkage assembly including a cam connecting each of the pair of curved arms to the other at a second end of each of the pair of curved arms opposite to the first end and having a cam surface facing the mounting bracket; and
inserting a third pivot pin along a third hinge axis parallel to the first hinge axis through the cam and through a bracket of the occlusion bed,
wherein, when the lid is in a closed position, the mounting bracket extends between the pair of curved arms to abut the cam surface and form a cooperative connection between the lid and the occlusion bed via the linkage assembly.