PUMP ACTUATOR INCLUDING ROTATABLE CAMS

• US 3,798,982 A
• Filed: 04/25/1973
• Issued: 03/26/1974
• Est. Priority Date: 04/25/1973
• Status: Expired due to Term

• Current Assignee: Ingemar H. Lundquist
• Original Assignee: Ingemar H. Lundquist
• Inventors: Lundquist, Ingemar H.
• Primary Examiner(s): Wyche, Benjamin W.
• Assistant Examiner(s): Ratliff, Jr., Wesley S.
• Application Number:
  US05/354,242
• Time in Patent Office: 335 Days
• Field of Search: 74/53,568T,568M 128/124F,124E
• US Class Current: 74/53
• CPC Class Codes: A61M 5/172 electrical or electronic A61M5/16804, A61M5/16831 take precedence
• CPC Class Codes: F04B 43/08 having tubular flexible members F04B43/12 takes precedence
• CPC Class Codes: F04B 49/12 by varying the length of stroke of the working members
• CPC Class Codes: F04B 9/042 the means being cams
• CPC Class Codes: F16H 25/16 for interconverting rotary motion and oscillating motion
• CPC Class Codes: Y10T 74/1828 Cam, lever, and slide

Abstract

The intravenous feeding pump actuator of the present invention comprises a plurality of cam assemblies (preferably two) rotating on a common shaft, one pinned, or otherwise affixed to the shaft and the other assembly mounted on a quill shaft encompassing the common shaft; the cams being provided with a variable number of cam lobes, the height of the lobe preferably being the same on each cam, but the cams having a varying number of lobes (preferably running from '"'"''"'"''"'"''"'"' 1'"'"''"'"''"'"''"'"' to '"'"''"'"''"'"''"'"' 19'"'"''"'"''"'"''"'"' ); a follower positionable along said cam assembly so as to be operated by the rotation of a selected one of said cams; means for adjustably limiting the backstroke of the cam follower; means for operating an intravenous feeding pump, or similar device, from the rocking of the cam follower; and a drive means including an electric motor and a gear reducer for driving the drive shaft at one speed (preferably 10 r.p.m.) and a gear assembly for driving the quill shaft and its cam assembly at a much lesser speed (preferably one-half of one revolution per minute) or a speed reduction of one to 20.

Claims

1. An actuator for a detachable piston comprising:

1. a plurality of axially aligned cam assemblies, the cams of each assembly having a differing number of rises thereon;

2. means for rotating said cam assemblies at different speeds;

3. a cam follower movable along an operating shaft parallel to the axis of said cams;

4. means for causing said follower to follow the contour of the cam to which it is in opposition;

5. means for moving said cam follower along its operating shaft;

6. means for adjusting the length of stroke of the follower in each position thereof;

7. a piston operating member operated by the cam follower and adapted to operate the pump piston; and

8. detaining means for holding the cam follower in an adjusted axial position.

2. The apparatus of claim 1 comprising also a scale for indicating the position of said follower.

3. a cam follower movable along an operating shaft parallel to the axis of said cams;

4. An actuator for a detachable intravenous feeding pump having a piston extending outside of its casing and resilient means for returning the piston to an inoperative position, said actuator comprising:

5. means for moving said cam follower along its operating shaft;

6. means for moving said cam follower along its operating shaft;

7. a piston operating member operated by the cam follower and adapted to operate the pump piston;

and

8. a piston operating member operated by the cam follower and adapted to operate the pump piston;

9. locking means for holding the cam follower to an adjusted axial position;

and

10. a pointer and scale for indicating the position of said follower.