US4054925A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Endless loop recorder having temperature compensated tensioning
Assignee: BAE Systems PLC
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Filing: 1976-05-07
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Granted: 1977-10-18
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Expires: 1996-05-07
Abstract
Abstract A data recorder comprising a recording medium in the form of an endless loop of magnetic tape, and one or more magnetic heads, the magnetic tape being wound around former means comprising a plurality of rotatable members to provide a tape store, the rotatable members and inner turn of tape defining within the center of the store an area in which the or each magnetic head is mounted.
Inventors
- 👤 Frank Richard Towner
- 👤 Joseph Charles Hawkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:11
CPC Classifications
G; G11; G11B; G11B23/00; G11B23/02; G11B23/021; G11B15/00; G11B15/18; G11B15/1883
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
166 words
A data recorder comprising a recording medium in the form of an endless loop of magnetic tape, and magnetic head means, the magnetic tape being wound around former means comprising a plurality of roller members to provide a tape store, the roller members and inner turn of tape in said loop defining within the center of the store an area in which the magnetic head means are mounted, at least one of said roller members being mounted near one end of a movable arm, means mounting said movable arm for pivotal movement in a plane parallel to the plane of the endless loop whereby pivotal motion of the movable arm adjusts the tension in said tape, temperature-sensitive expandable means to pivot said movable arm in accordance with temperature changes, said temperature sensitive means being providing pivotal movement of said movable arm to an extent which compensates for the change in loop length due to the same temperature change so as to maintain tape tension substantially constant.
Claim 2
Dependent Claim
166 words
A data recorder comprising a recording medium in the form of an endless loop of magnetic tape, and magnetic head means, the magnetic tape being wound around former means comprising a plurality of roller members to provide a tape store, the roller members and inner turn of tape in said loop defining within the center of the store an area in which the magnetic head means are mounted, at least one of said roller members being mounted near one end of a movable arm, means mounting said movable arm for pivotal movement in a plane parallel to the plane of the endless loop whereby pivotal motion of the movable arm adjusts the tension in said tape, temperature-sensitive expandable means to pivot said movable arm in accordance with temperature changes, said temperature sensitive means being providing pivotal movement of said movable arm to an extent which compensates for the change in loop length due to the same temperature change so as to maintain tape tension substantially constant.
Claim 3
Dependent Claim
36 words
A recorder according to claim 1, wherein two roller members are movably mounted on respective movable arms coupled together and a single temperature-sensitive means is used to effect the desired movement of both movable rotatable members.
Claim 4
Dependent Claim
26 words
A recorder according to claim 2, wherein the two movable arms are coupled together by two toothed sectors arranged in mesh and attached to respective arms.
Claim 5
Dependent Claim
44 words
A recorder according to claim 1, wherein the temperature-sensitive means comprises a cylinder and plunger with the cylinder containing a fluid which expands and contracts with temperature changes so as to move the plunger accordingly, said plunger being mechanically coupled to said movable arm.
Claim 6
Dependent Claim
26 words
A recorder according to claim 1, wherein two roller members are employed to provide a generally elongated area in which the magnetic head means are mounted.
Claim 7
Dependent Claim
26 words
A recorder according to claim 1, wherein three roller members are employed to provide a generally triangular area in which the magnetic head means are mounted.
Claim 8
Dependent Claim
26 words
A recorder according to claim 1, wherein four roller members are employed to provide a generally rectangular area in which the magnetic head means are mounted.
Claim 9
Dependent Claim
29 words
A recorder according to claim 1, wherein the number of roller members is such as to provide a generally circular area in which the magnetic head means are mounted.
Claim 10
Dependent Claim
100 words
A data recorder comprising a recording medium in the form of an endless loop of magnetic tape wound around a plurality of roller members to provide a tape store, means mounting at least one of the roller members being for movement so as to be positionable transversely in the plane of said loop, temperature-sensitive expandable means to adjust the position of said movable roller in response to changes in temperature, said temperature-sensitive means providing said positioning so that expansion and contraction of the tape due to temperature variations is accommodated so as to maintain tension in the tape substantially constant.
Claim 11
Dependent Claim
100 words
A data recorder comprising a recording medium in the form of an endless loop of magnetic tape wound around a plurality of roller members to provide a tape store, means mounting at least one of the roller members being for movement so as to be positionable transversely in the plane of said loop, temperature-sensitive expandable means to adjust the position of said movable roller in response to changes in temperature, said temperature-sensitive means providing said positioning so that expansion and contraction of the tape due to temperature variations is accommodated so as to maintain tension in the tape substantially constant.
Claim 12
Dependent Claim
51 words
A recorder according to claim 9, wherein each movably mounted roller member is mounted on one end of a pivotable arm, the other end of which contacts said temperature-sensitive means so as to pivot the arm upon a change in temperature and thereby move the roller member in the required direction.
Claim 13
Dependent Claim
36 words
A recorder according to claim 10 wherein two roller members are movably mounted on respective pivotable arms coupled together and a single temperature-sensitive means is used to effect the movement of both movably mounted roller members.
Claim 14
Dependent Claim
65 words
A recorder according to claim 10, wherein the temperature-sensitive means device comprises a fixed cylinder and a movable plunger with the cylinder containing a fluid which expands and contracts with temperature changes so as to regulate the position of the plunger, said plunger being maintained in contact with a pivotable arm so as to adjust the position of the arm in accordance with temperature changes.
Claim 15
Dependent Claim
27 words
A recorder according to claim 11, wherein the two pivotable arms are coupled together by two toothed sectors arranged in mesh and attached to the respective arms.
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) | 1980-10-17 | 1981-04-18 | 1981-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-17 | 1985-04-18 | 1985-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-17 | 1989-04-18 | 1989-10-18 | $7700.00 | Window Closed / Lapsed |