US4754653A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Force measuring device
Assignee: Pfister GmbH
•
Filing: 1985-12-10
•
Granted: 1988-07-05
•
Expires: 2005-12-10
Abstract
Abstract The force measuring device comprises two plates arranged essentially parallel to each other and having therein between an elastomeric material into which a pressure sensor is embedded.
Inventors
- 👤 Hans W. Hafner
- 👤 Gunter Bock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 01:06
CPC Classifications
B; B29; B29C; B29C37/00; B29C37/006; B29C39/00; B29C39/02; B29C39/04; B29C39/08; B29C70/00; B29C70/68; B29C70/84; G; G01; G01L; G01L1/00; G01L1/20
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
120 words
A force measuring device comprising: (a) a base member; (b) a force introduction member spaced from said base member to form a space therebetween, one said member having a cylindrical recess and the other said member being fitted into said recess so as to form a narrow annular gap between an inner peripheral surface of said recessed member and an outer peripheral surface of said other member; (c) a body of essentially bubblefree elastomeric material provided in a bottom region of said cylindrical recess and in engagement with an inner face surface of said force introduction member and extending into said gap; and (d) at least one pressure sensor in said space in contact with said body of elastomeric material.
Claim 2
Dependent Claim
120 words
A force measuring device comprising: (a) a base member; (b) a force introduction member spaced from said base member to form a space therebetween, one said member having a cylindrical recess and the other said member being fitted into said recess so as to form a narrow annular gap between an inner peripheral surface of said recessed member and an outer peripheral surface of said other member; (c) a body of essentially bubblefree elastomeric material provided in a bottom region of said cylindrical recess and in engagement with an inner face surface of said force introduction member and extending into said gap; and (d) at least one pressure sensor in said space in contact with said body of elastomeric material.
Claim 3
Dependent Claim
29 words
The force measuring device of claim 1, wherein a vertical dimension of said gap is in the range of one to four times the diameter of said cylindrical recess.
Claim 4
Dependent Claim
28 words
The force measuring device of claim 1 wherein said width of said gap is in the range of 1/100 to 1/100 of the diameter of said cylindrical recess.
Claim 5
Dependent Claim
30 words
The force measuring device of claim 1 or 3 wherein said height of said gap is in the range of 1/50 to five times the diameter of said cylindrical recess.
Claim 6
Dependent Claim
43 words
The force measuring device of claim 1 or 3 wherein said elastomeric material is one of the materials selected from the group comprising: silicon rubber, styrene rubber, butadiene rubber, polysulfide rubber, a polyacrylate, a polyurethane, or a mixture of any of said materials.
Claim 7
Dependent Claim
29 words
The force measuring device of claim 1 or 3 wherein said elastomeric material strongly adheres to surfaces of said base member and said force introduction member in contact therewith.
Claim 8
Dependent Claim
28 words
The force measuring device of claim 6 wherein said elastomeric material is vulcanized to said surfaces of said base member and said force introduction member in contact therewith.
Claim 9
Dependent Claim
16 words
The force measuring device of claim 1 wherein said pressure sensor is a piezoelectric sensor means.
Claim 10
Dependent Claim
26 words
The force measuring device of claim 1 wherein a bottom wall of said base member is provided with an opening for removably receiving said pressure sensor.
Claim 11
Dependent Claim
33 words
The force measuring device of claim 9 further comprising fixing means for mounting said pressure sensor in said opening and closure means for tightly sealing said opening after insertion of said pressure sensor.
Claim 12
Dependent Claim
22 words
The force measuring device of claim 1 wherein said width of said gap is in the order of 0.1 to 2 mm.
Claim 13
Dependent Claim
24 words
The force measuring device of claim 1 wherein a lower face surface of said force introduction member is convexly shaped in the downward direction.
Claim 14
Dependent Claim
23 words
The force measuring device of claim 1 or 12 wherein a bottom surface of said cylindrical recess is concavely shaped in upward direction.
Claim 15
Dependent Claim
80 words
A force measuring device comprising: (a) a base member having an extended upper surface; (b) a force introduction member having an extended lower surface arranged opposite and in spaced relationship to said upper surface of said base member; (c) a body of essentially bubblefree elastomeric material arranged between said surfaces and strongly adhering thereto; and (d) a plurality of pressure sensors distributed within an area defined by said upper and lower surfaces and arranged in contact with said elastomeric material.
Claim 16
Dependent Claim
80 words
A force measuring device comprising: (a) a base member having an extended upper surface; (b) a force introduction member having an extended lower surface arranged opposite and in spaced relationship to said upper surface of said base member; (c) a body of essentially bubblefree elastomeric material arranged between said surfaces and strongly adhering thereto; and (d) a plurality of pressure sensors distributed within an area defined by said upper and lower surfaces and arranged in contact with said elastomeric material.
References Cited (Backward Citations)
FR516321A
Cited
US1994388A
Cited
US2847707A
Cited
US3410135A
Cited
US3582691A
Cited
FR2093260A5
Cited
FR2126695A5
Cited
GB1347586A
Cited
US4127788A
Cited
GB2001766A
Cited
US4167381A
Cited
US4175429A
Cited
GB2024697A
Cited
US4383584A
Cited
US4644805A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-07-05 | 1992-01-04 | 1992-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-05 | 1996-01-04 | 1996-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-05 | 2000-01-04 | 2000-07-05 | $7700.00 | Window Closed / Lapsed |