US3743201A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cassette for strip chart recorders
Assignee: Individual
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Filing: 1971-06-09
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Granted: 1973-07-03
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Expires: 1991-06-09
Abstract
Abstract A low-cost chart paper cassette for strip-chart recording instruments. Analogously to film and tape cassettes, the chart cassette contains a roll of chart paper and a takeup spool, and is attachable to a chart recording instrument built to fit it. The box-like housing of the cassette may be made of two havles molded of plastic material, cemented together. The chart paper moves forward across the top of the cassette under the recording stylus, down the front of the cassette, and back inside onto the takeup spool. The chart paper is moved by sprockets which are part of the recording instrument and intrude into the front of the cassette when it is in place. The takeup spool shaft protrudes from the side of the cassette and carries a gear which meshes with a gear on the instrument. The supply spool shaft may also protrude. When a knob is attached to this shaft, a detached cassette may operate as a chart viewer. For monitoring long records, the paper may be cut externally of the cassette, and allowed to hang down outside. For compact storage of records, the roll may be removed from the cassette. The cassette has a groove, along which it may be separated or broken apart, the portion containing the takeup spool and record being retained for storage.
Inventors
- 👤 R Tarantino
- 👤 J Yeiser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:21
CPC Classifications
G; G01; G01D; G01D15/00; G01D15/28
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
117 words
A low-cost cassette for a strip chart recording instrument having a chart marking element comprising: a case attachable to said instrument, a chart supply spool and a chart takeup spool in said case, a first opening in said case, said chart passing from said supply spool out said opening to lie along an outer surface of said case, a portion of said surface being disposed as a writing surface for said marking element, and a second opening in said case, said chart passing back into said opening to said takeup spool, said cassette being adapted to the intrusion of a chart driving element on said instrument to engage said chart and move it at a predetermined rate.
Claim 2
Dependent Claim
117 words
A low-cost cassette for a strip chart recording instrument having a chart marking element comprising: a case attachable to said instrument, a chart supply spool and a chart takeup spool in said case, a first opening in said case, said chart passing from said supply spool out said opening to lie along an outer surface of said case, a portion of said surface being disposed as a writing surface for said marking element, and a second opening in said case, said chart passing back into said opening to said takeup spool, said cassette being adapted to the intrusion of a chart driving element on said instrument to engage said chart and move it at a predetermined rate.
Claim 3
Dependent Claim
28 words
A cassette as in claim 1, further comprising: an external generally circular element rotatably connected to said takeup spool and adapted to engage torque-producing means on said instrument.
Claim 4
Dependent Claim
25 words
A cassette as in claim 1, further comprising: recessed portions in said case adapted to fit accurately around a shaft carrying said chart driving element.
Claim 5
Dependent Claim
36 words
A cassette as in claim 1, further comprising: recessed portions in said case adapted to fit closely around shaft bearing supports for said chart driving element to locate said cassette accurately with respect to said instrument.
Claim 6
Dependent Claim
22 words
A cassette as in claim 1, wherein said chart has sprocket perforations and said chart driving element comprises a sprocket engageable therewith.
Claim 7
Dependent Claim
43 words
A cassette as in claim 2, further comprising: a knob-like element rotatably connected to said supply spool, whereby said chart may be moved back and forth by turning said knoblike element and said circular driven element to view selected portions of said chart.
Claim 8
Dependent Claim
49 words
A cassette as in claim 1, wherein: said supply spool and takeup spool are mounted on shafts supported in the sides of said case, and said case is made in two halves attached together at a joining line, said line passing substantially through the center lines of said shafts.
Claim 9
Dependent Claim
59 words
A cassette as in claim 1, further comprising: a line-like separation belt extending around said case between the portion containing said supply spool and the portion containing said takeup spool, whereby said portions may be separated and the portion containing said takeup spool used as a storage container for the chart on said spool and the remaining portion discarded.
Claim 10
Dependent Claim
114 words
In combination, a strip chart recording instrument having a chart-marking element, a chart drive sprocket assembly, and a torque driving element all protruding therefrom, and a chart cassette attachable thereto, said cassette comprising: an opening to receive portions of said sprocket assembly to drive said chart, a takeup spool rotatably connected to a drivable element adapted to engage said torque driving element, a supply spool containing a spooled chart, and a first and a second slot, said chart exiting through said first slot to the exterior surface of said cassette, passing over said exterior surface under said chart marking element, and re-entering said cassette through said second slot and passing onto said takeup spool.
Claim 11
Dependent Claim
114 words
In combination, a strip chart recording instrument having a chart-marking element, a chart drive sprocket assembly, and a torque driving element all protruding therefrom, and a chart cassette attachable thereto, said cassette comprising: an opening to receive portions of said sprocket assembly to drive said chart, a takeup spool rotatably connected to a drivable element adapted to engage said torque driving element, a supply spool containing a spooled chart, and a first and a second slot, said chart exiting through said first slot to the exterior surface of said cassette, passing over said exterior surface under said chart marking element, and re-entering said cassette through said second slot and passing onto said takeup spool.
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) | 1976-07-02 | 1977-01-01 | 1977-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-02 | 1981-01-01 | 1981-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-02 | 1985-01-01 | 1985-07-03 | $7700.00 | Window Closed / Lapsed |