Patent US2760654A successfully refreshed from Google Patents.
US3757566A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hardness tester for tablets
Assignee: STRAUSAK AG MASCHINENFABRIK
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Filing: 1971-09-28
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Granted: 1973-09-11
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Expires: 1991-09-28
Abstract
Abstract A hardness tester for tablets comprises a power-driven pressure slide supporting the tablets and a measuring slide mechanically connected to a weight. The slides and the weight constitute a pendulum weight to which a cord is fastened. The cord is trained about guide rolls and carries between two of the rolls an engaging means actuating a drag pointer fastened to a second cord parallel to the first cord. The force acting on the tablet is indicated on a linear scale.
Inventors
- 👤 K Flury
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:55
CPC Classifications
G; G01; G01N; G01N3/00; G01N3/40
Claims Analysis
Total Claims: 35
Claim 1
Independent Claim
261 words
An apparatus for testing the hardness of a tablet, comprising 1. a pressure slide having a support for the tabLet; 2. a hardness measuring slide associated with the pressure slide and mounted adjacent the tablet support; 3. an electric motor for driving the pressure slide towards the measuring slide a. whereby a tablet on the support is subjected to compressive force between the driven pressure slide and the measuring slide; 4. a pendulum weight mechanically connected to the measuring slide for movement in response to sliding movement of the measuring slide caused by the driven pressure slide; 5. a first cord having two ends; 6. a plurality of guide rolls over which the cord is trained, a. two of the guide rolls defining a linearly extending section of the cord intermediate the ends thereof, and b. the cord being attached to the pendulum weight for movement of the cord over the guide rolls in response to movement of the pendulum weight; 7. a second cord having a linearly extending section parallel to the linearly extending section of the first cord; 8. a drag pointer fastened to the second cord; 9. a linear scale associated with the drag pointer and indicating the linear position thereof; and 10. a drag pointer engaging means fastened to the linearly extending section of the first cord, the engaging means engaging the drag pointer upon the movement of the first cord and moving the drag pointer to indicate on the linear scale the compressive force to which the driven pressure slide subjects the table between the slides.
Claim 2
Independent Claim
261 words
An apparatus for testing the hardness of a tablet, comprising 1. a pressure slide having a support for the tabLet; 2. a hardness measuring slide associated with the pressure slide and mounted adjacent the tablet support; 3. an electric motor for driving the pressure slide towards the measuring slide a. whereby a tablet on the support is subjected to compressive force between the driven pressure slide and the measuring slide; 4. a pendulum weight mechanically connected to the measuring slide for movement in response to sliding movement of the measuring slide caused by the driven pressure slide; 5. a first cord having two ends; 6. a plurality of guide rolls over which the cord is trained, a. two of the guide rolls defining a linearly extending section of the cord intermediate the ends thereof, and b. the cord being attached to the pendulum weight for movement of the cord over the guide rolls in response to movement of the pendulum weight; 7. a second cord having a linearly extending section parallel to the linearly extending section of the first cord; 8. a drag pointer fastened to the second cord; 9. a linear scale associated with the drag pointer and indicating the linear position thereof; and 10. a drag pointer engaging means fastened to the linearly extending section of the first cord, the engaging means engaging the drag pointer upon the movement of the first cord and moving the drag pointer to indicate on the linear scale the compressive force to which the driven pressure slide subjects the table between the slides.
Claim 3
Dependent Claim
15 words
a hardness measuring slide associated with the pressure slide and mounted adjacent the tablet support;
Claim 4
Dependent Claim
15 words
a hardness measuring slide associated with the pressure slide and mounted adjacent the tablet support;
Claim 5
Dependent Claim
75 words
The testing apparatus of claim 1, further comprising gear means interposed between the motor and the pressue slide, the gear means being arranged for reversing the pressure slide drive, an electrical control circuit for the electric motor, the drag pointer and the drag pointer engaging means being electrical contacts forming part of the electrical control circuit, and the gear means reversing the drive upon interruption of contact between the drag pointer and the engaging means.
Claim 6
Dependent Claim
51 words
The testing apparatus of claim 2, wherein the gear means comprises an output shaft, a driving roll eccentric to the output shaft is carried by the shaft, and the driving roll engages a groove in the pressure slide, the groove extending perpendicularly to the direction of movement of the pressure slide.
Claim 7
Dependent Claim
33 words
an electric motor for driving the pressure slide towards the measuring slide a. whereby a tablet on the support is subjected to compressive force between the driven pressure slide and the measuring slide;
Claim 8
Dependent Claim
33 words
an electric motor for driving the pressure slide towards the measuring slide a. whereby a tablet on the support is subjected to compressive force between the driven pressure slide and the measuring slide;
Claim 9
Dependent Claim
26 words
a pendulum weight mechanically connected to the measuring slide for movement in response to sliding movement of the measuring slide caused by the driven pressure slide;
Claim 10
Dependent Claim
26 words
a pendulum weight mechanically connected to the measuring slide for movement in response to sliding movement of the measuring slide caused by the driven pressure slide;
Claim 11
Dependent Claim
158 words
The testing apparatus of claim 1, wherein the pendulum weight is mechanically connected to the measuring slide by a two-armed lever, one of the lever arms supporting the pendulum weight and the other lever arm extending at an obtuse angle therefrom, and a connecting element between the other lever arm and the measuring slide, a needle bearing affixing one end of the connecting element to the other lever and the connecting element having a knife edge at the other end bearing in a corresponding groove in the measuring slide facing the knife edge, the connecting element extending at an obtuse angle to the other lever arm, the angles of the other lever arm and the connecting element being such that the measuring slide is subjected to a force approximately proportional to the angle of deflection of the pendulum weight; and a tension spring having a respective end thereof attached to the measuring slide and to the needle bearing.
Claim 12
Dependent Claim
110 words
The testing apparatus of claim 1, wherein the pendulum weight is mechanically connected to the measuring slide by a two-armed lever, one of the lever arms supporting the pendulum weight and the other lever arm having an arcuate guide surface progressively increasing with an increasing deflection of the pendulum weight, and a connecting steel band between the one lever arm and the measuring slide, one end of the steel band being affixed to the one lever arm and the other steel band end being affixed to the measuring slide, and a section of the steel band intermediate the ends thereof being trained over and supported by the arcuate guide surface.
Claim 13
Dependent Claim
6 words
a first cord having two ends;
Claim 14
Dependent Claim
6 words
a first cord having two ends;
Claim 15
Dependent Claim
56 words
a plurality of guide rolls over which the cord is trained, a. two of the guide rolls defining a linearly extending section of the cord intermediate the ends thereof, and b. the cord being attached to the pendulum weight for movement of the cord over the guide rolls in response to movement of the pendulum weight;
Claim 16
Dependent Claim
56 words
a plurality of guide rolls over which the cord is trained, a. two of the guide rolls defining a linearly extending section of the cord intermediate the ends thereof, and b. the cord being attached to the pendulum weight for movement of the cord over the guide rolls in response to movement of the pendulum weight;
Claim 17
Dependent Claim
56 words
The testing apparatus of claim 1, further comprising gear means interposed between the motoR and the pressure slide, the gear means being arranged for reversing the pressure slide drive and having an output shaft, a pinion on the output shaft and coaxial therewith, and a rack meshing with the pinion and affixed to the pressure slide.
Claim 18
Dependent Claim
62 words
The testing apparatus of claim 1, further comprising an intermediate pressure element slidably mounted on the measuring slide between the measuring slide and the tablet support of the pressure slide, the intermediate pressure element being slidable in the direction of movement of the pressure slide, and spring means acting upon the intermediate pressure element and biasing the same towards the pressure slide.
Claim 19
Dependent Claim
18 words
a second cord having a linearly extending section parallel to the linearly extending section of the first cord;
Claim 20
Dependent Claim
18 words
a second cord having a linearly extending section parallel to the linearly extending section of the first cord;
Claim 21
Dependent Claim
8 words
a drag pointer fastened to the second cord;
Claim 22
Dependent Claim
8 words
a drag pointer fastened to the second cord;
Claim 23
Dependent Claim
32 words
The testing apparatus of claim 1, wherein the two cord ends are attached to the pendulum weight for movement of the first cord in response to the movement of the pendulum weight.
Claim 24
Dependent Claim
43 words
The testing apparatus of claim 1, wherein the pendulum weight carries a pair of coaxial guide rolls over which the respective ends of the first cord are trained, the respective cord ends trained over the coaxial guide rolls being fastened to the apparatus.
Claim 25
Dependent Claim
15 words
a linear scale associated with the drag pointer and indicating the linear position thereof; and
Claim 26
Dependent Claim
15 words
a linear scale associated with the drag pointer and indicating the linear position thereof; and
Claim 27
Dependent Claim
55 words
a drag pointer engaging means fastened to the linearly extending section of the first cord, the engaging means engaging the drag pointer upon the movement of the first cord and moving the drag pointer to indicate on the linear scale the compressive force to which the driven pressure slide subjects the table between the slides.
Claim 28
Dependent Claim
55 words
a drag pointer engaging means fastened to the linearly extending section of the first cord, the engaging means engaging the drag pointer upon the movement of the first cord and moving the drag pointer to indicate on the linear scale the compressive force to which the driven pressure slide subjects the table between the slides.
Claim 29
Dependent Claim
19 words
The testing apparatus of claim 1, further comprising a pair of movable tolerance markers mounted on the linear scale.
Claim 30
Dependent Claim
28 words
The testing apparatus of claim 10, wherein the drag pointer comprises a magnetic material, the tolerance markers comprise Hall generators responding to the approach of the drag pointer.
Claim 31
Dependent Claim
45 words
The testing apparatus of claim 1, further comprising a pair of guide rolls over which the second cord is trained, a motor for resetting the drag pointer, and a slip clutch mounting the resetting motor on one of the guide rolls for the second cord.
Claim 32
Dependent Claim
34 words
The testing apparatus of claim 12, further comprising a potentiometer mounted on the other guide roll for the second cord, the potentiometer indicating the position of the drag pointer in respect of the scale.
Claim 33
Dependent Claim
46 words
The testing apparatus of claim 1, further comprising a protective cover mounted over the pressure and measuring slides, and a switch mounted adjacent the protective cover for stopping the electric motor and thus to stop the movement of the pressure slide when the cover is opened.
Claim 34
Dependent Claim
51 words
The testing apparatus of claim 1, further comprising an electrical control circuit for the motor, the circuit including the first and second cords, the cords being of electrically conductive material, power transmitting contacts in respective contact with the first and second cords, and the drag pointer and drag pointer engaging means.
Claim 35
Dependent Claim
40 words
The testing apparatus of claim 1, further comprising an electrical control circuit for the motor, the circuit including a limit switch adjacent the pressure slide and arranged to be tripped thereby when the pressure slide is in its home position.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-10 | 1977-03-12 | 1977-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-10 | 1981-03-12 | 1981-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-10 | 1985-03-12 | 1985-09-11 | $7700.00 | Window Closed / Lapsed |