Patent US3798982A successfully refreshed from Google Patents.
US3798982A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pump actuator including rotatable cams
Assignee: ORIGO
•
Filing: 1973-04-25
•
Granted: 1974-03-26
•
Expires: 1993-04-25
Abstract
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.
Inventors
- 👤 I Lundquist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:39
CPC Classifications
F; F04; F04B; F04B49/00; F04B49/12; A; A61; A61M; A61M5/00; A61M5/14; A61M5/168; A61M5/172; F04B43/00; F04B43/08; F04B9/00; F04B9/02; F04B9/04; F04B9/042; F16; F16H; F16H25/00; F16H25/16; Y; Y10; Y10T; Y10T74/00; Y10T74/18; Y10T74/18056; Y10T74/1828
Claims Analysis
Total Claims: 39
Claim 1
Independent Claim
129 words
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.
Claim 2
Dependent Claim
129 words
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.
Claim 3
Dependent Claim
9 words
means for rotating said cam assemblies at different speeds;
Claim 4
Dependent Claim
9 words
means for rotating said cam assemblies at different speeds;
Claim 5
Dependent Claim
48 words
a pair of cam assemblies on said shaft, one of said assemblies being affixed to the shaft and the other of said assemblies being mounted on a quill shaft journalled on the shaft, the cams of each assembly having a differing number of lobes on the periphery thereof;
Claim 6
Dependent Claim
48 words
a pair of cam assemblies on said shaft, one of said assemblies being affixed to the shaft and the other of said assemblies being mounted on a quill shaft journalled on the shaft, the cams of each assembly having a differing number of lobes on the periphery thereof;
Claim 7
Dependent Claim
16 words
The apparatus of claim 1 comprising also a scale for indicating the position of said follower.
Claim 8
Dependent Claim
40 words
The apparatus of claim 1 wherein the cam assemblies are mounted on a common shaft, one of said assemblies being affixed to the shaft and the other of said assemblies being mounted on quill shafts journalled on the common shaft.
Claim 9
Dependent Claim
9 words
means for rotating said cam assemblies at different speeds;
Claim 10
Dependent Claim
9 words
means for rotating said cam assemblies at different speeds;
Claim 11
Dependent Claim
15 words
a cam follower movable along an operating shaft parallel to the axis of said cams;
Claim 12
Dependent Claim
15 words
a cam follower movable along an operating shaft parallel to the axis of said cams;
Claim 13
Dependent Claim
18 words
means for causing said follower to follow the contour of the cam to which it is in opposition;
Claim 14
Dependent Claim
18 words
means for causing said follower to follow the contour of the cam to which it is in opposition;
Claim 15
Dependent Claim
12 words
a cam follower movable along an operating shaft parallel to the shaft;
Claim 16
Dependent Claim
12 words
a cam follower movable along an operating shaft parallel to the shaft;
Claim 17
Dependent Claim
30 words
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:
Claim 18
Dependent Claim
30 words
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:
Claim 19
Dependent Claim
25 words
The apparatus of claim 4 comprising also manual means for operating said piston operating member to an extreme operative position and releasing said locking means.
Claim 20
Dependent Claim
12 words
means for resiliently biasing said cam follower into engagement with said cams;
Claim 21
Dependent Claim
12 words
means for resiliently biasing said cam follower into engagement with said cams;
Claim 22
Dependent Claim
10 words
means for moving said cam follower along its operating shaft;
Claim 23
Dependent Claim
10 words
means for moving said cam follower along its operating shaft;
Claim 24
Dependent Claim
14 words
means for adjusting the length of stroke of the follower in each position thereof;
Claim 25
Dependent Claim
14 words
means for adjusting the length of stroke of the follower in each position thereof;
Claim 26
Dependent Claim
10 words
means for moving said cam follower along its operating shaft;
Claim 27
Dependent Claim
10 words
means for moving said cam follower along its operating shaft;
Claim 28
Dependent Claim
14 words
means for adjusting the length of stroke of the follower in each position thereof;
Claim 29
Dependent Claim
14 words
means for adjusting the length of stroke of the follower in each position thereof;
Claim 30
Dependent Claim
17 words
a piston operating member operated by the cam follower and adapted to operate the pump piston; and
Claim 31
Dependent Claim
17 words
a piston operating member operated by the cam follower and adapted to operate the pump piston; and
Claim 32
Dependent Claim
12 words
detaining means for holding the cam follower in an adjusted axial position.
Claim 33
Dependent Claim
12 words
detaining means for holding the cam follower in an adjusted axial position.
Claim 34
Dependent Claim
16 words
a piston operating member operated by the cam follower and adapted to operate the pump piston;
Claim 35
Dependent Claim
16 words
a piston operating member operated by the cam follower and adapted to operate the pump piston;
Claim 36
Dependent Claim
13 words
locking means for holding the cam follower to an adjusted axial position; and
Claim 37
Dependent Claim
13 words
locking means for holding the cam follower to an adjusted axial position; and
Claim 38
Dependent Claim
11 words
a pointer and scale for indicating the position of said follower.
Claim 39
Dependent Claim
11 words
a pointer and scale for indicating the position of said follower.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-25 | 1977-09-24 | 1978-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-25 | 1981-09-24 | 1982-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-25 | 1985-09-24 | 1986-03-26 | $7700.00 | Window Closed / Lapsed |