Patent US4666198A successfully refreshed from Google Patents.
US4666198A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piezoelectric polymer microgripper
Assignee: OHIO VALLEY VENTURE CAPITAL Corp
•
Filing: 1986-01-27
•
Granted: 1987-05-19
•
Expires: 2006-01-27
Abstract
Abstract Improved microgrippers using piezoelectric polymers are disclosed utilizing a pair of levers formed in a plier-like structure having piezoelectric polymer composite sheets connected between the levers or between each lever and a third intermediate lever or through a drive linkage to the levers. By appropriate application of electric fields, jaws formed at the ends of the levers are moved toward and away from each other to accomplish the grasping and releasing action.
Inventors
- 👤 David L. Heiserman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:37
CPC Classifications
B; B25; B25J; B25J9/00; B25J9/10; B25J9/12; B25J15/00; B25J19/00; B25J19/02; B25J19/028; B65; B65G; B65G47/00; B65G47/74; B65G47/90
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
109 words
An apparatus for grasping and releasing an object, the apparatus comprising: (a) at least two levers each relatively pivotable about a fulcrum and having cooperating jaw portions, a lever arm of at least one lever being movable relatively nearer and farther from the other jaw portion for grasping and releasing an object; (b) a laminated, flexible sheet comprising at least two flexible layers which are bonded together, at least one of said layers being a piezoelectric polymer layer, said laminated sheet being drivingly linked to said levers for moving the jaw portions with respect to each other; and (c) means for applying an electric field through said polymer layer.
Claim 2
Independent Claim
109 words
An apparatus for grasping and releasing an object, the apparatus comprising: (a) at least two levers each relatively pivotable about a fulcrum and having cooperating jaw portions, a lever arm of at least one lever being movable relatively nearer and farther from the other jaw portion for grasping and releasing an object; (b) a laminated, flexible sheet comprising at least two flexible layers which are bonded together, at least one of said layers being a piezoelectric polymer layer, said laminated sheet being drivingly linked to said levers for moving the jaw portions with respect to each other; and (c) means for applying an electric field through said polymer layer.
Claim 3
Dependent Claim
16 words
An apparatus in accordance with claim 1 wherein both of said layers are piezoelectric polymer layers.
Claim 4
Dependent Claim
15 words
An apparatus in accordance with claim 2 wherein said piezoelectric polymer layers are oppositely polarized.
Claim 5
Dependent Claim
63 words
An apparatus in accordance with claim 3 wherein said means for applying an electric field through the polymer layers includes a pair of electrically conductive, flexible films bonded to each oppositely facing exterior surface of the laminated sheet and electrically insulated from each other to form a composite sheet and a variable DC voltage source which is controllably connected to the conductive films.
Claim 6
Dependent Claim
25 words
An apparatus in accordance with claim 1 or claim 4 wherein said laminated flexible sheet is connected to and extends directly between said two levers.
Claim 7
Dependent Claim
13 words
An apparatus in accordance with claim 5 wherein said sheet is trapezoidally shaped.
Claim 8
Dependent Claim
23 words
An apparatus in accordance with claim 5 wherein said jaw portions and said laminated flexible sheet are on opposite sides of the fulcrum.
Claim 9
Dependent Claim
24 words
An apparatus in accordance with claim 5 wherein said jaw portions and said laminated flexible sheet are on the same side of the fulcrum.
Claim 10
Dependent Claim
14 words
An apparatus in accordance with claim 5 wherein one of said levers is stationary.
Claim 11
Dependent Claim
19 words
An apparatus in accordance with claim 5 wherein said laminated flexible sheet is formed substantially in an arcuate shape.
Claim 12
Dependent Claim
18 words
An apparatus in accordance with claim 5 wherein each of said levers is pivoted on a different fulcrum.
Claim 13
Dependent Claim
60 words
An apparatus in accordance with claim 1 or claim 4 wherein a relatively stationary support is pivotally connected to said levers and wherein said laminated flexible sheet comprises a first laminated sheet connected to and extending between said support and one of the levers and a second laminated sheet connected to and extending between said support and the other lever.
Claim 14
Dependent Claim
47 words
An apparatus in accordance with claim 12 wherein said laminated flexible sheet comprises a plurality of laminated sheets connected to and extending between said support and one of the levers and a plurality of laminated sheets connected to and extending between said support and the other lever.
Claim 15
Dependent Claim
79 words
An apparatus in accordance with claim 1 or claim 4 wherein a relative stationary support beam is pivotally connected to said levers at the fulcrum of each lever and wherein said laminated flexible sheet comprises at least two flexible sheet cantilevers which are mounted at an end of each to said support beam and which extend generally parallel to the axis of said levers, the opposite end of each cantilever being linked to a different one of said levers.
Claim 16
Dependent Claim
24 words
An apparatus in accordance with claim 14 wherein each of said cantilevers is linked to its associated lever by means of a flexible band.
Claim 17
Dependent Claim
63 words
An apparatus in accordance with claim 1 or claim 4 wherein a first one of said levers is relatively stationary and wherein said laminated flexible sheet comprises a cantilever which is fixed at one end with respect to the relatively stationary lever and extends generally parallel to the axis of said levers and is linked at its opposite end to the second lever.
Claim 18
Dependent Claim
22 words
An apparatus in accordance with claim 16 wherein said cantilever is connected to said second lever by means of a flexible band.
Claim 19
Dependent Claim
112 words
An apparatus in accordance with claim 1 or claim 4 wherein a relatively stationary support beam is pivotally connected to said levers and wherein said laminated, flexible sheet comprises at least one cantilever which is fixed at one end with respect to said support beam and extends generally transverse to the axis of said levers, for being deflected toward and away from the levers, said cantilever connected at its opposite end to a push rod which extends generally parallel to the axis of said levers and is connected to linkage means connected to said levers for converting the substantially linear translation of the push rod to relative pivotal rotation of the levers.
Claim 20
Dependent Claim
30 words
An apparatus in accordance with claim 18 wherein said linkage means comprises a pair of links, each pivotally connected at their opposite ends to a different one of said levers.
References Cited (Backward Citations)
GB862174A
Cited
US3726557A
Cited
FR2241483A2
Cited
US4108486A
Cited
US3835338A
Cited
SU773715A1
Cited
SU867647A1
Cited
SU867646A1
Cited
US4342936A
Cited
US4400642A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-05-18 | 1990-11-17 | 1991-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-18 | 1994-11-17 | 1995-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-18 | 1998-11-17 | 1999-05-19 | $7700.00 | Window Closed / Lapsed |