US3643334A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pen carriage assembly
Assignee: Computer Industries Inc
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Filing: 1969-11-19
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Granted: 1972-02-22
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Expires: 1989-11-19
Abstract
Abstract A pen carriage assembly for automatic drafting machines is described having a scribe holder reciprocably driven by a pneumatic drive assembly. The scribe holder is driven in two modes, a pressure mode and a gravity mode. In the pressure mode, the pneumatic drive assembly includes a first pressure chamber, the expansion of which forces the movable portion of the assembly downward to move the scribe into writing engagement with the drafting paper. In the gravity mode, the pneumatic drive assembly includes a second pressure chamber, the expansion of which enables the movable portion of the assembly to be released from its support means to drop downwardly due to gravity and also to move the scribe into writing engagement with the drafting paper.
Inventors
- 👤 John Gelb
- 👤 Eugene M Merwin
- 👤 William B Richardson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:26
CPC Classifications
B; B43; B43L; B43L13/00; B43L13/02; B43L13/022; B43L13/024
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
162 words
A pen carriage for an automatic drafting machine in which the carriage is driven over a sheet of paper mounted on a drafting table comprising: a main carriage housing; a block assembly reciprocably mounted on said main carriage housing, said block assembly adapted to hold a scribe for writing on the paper; drive means for reciprocably driving said block assembly, said drive means including means forming a first pressure chamber, said means being drivingly connected to said block assembly, said means forming said first pressure chamber includes a fixed housing connected to said means connecting said first pressure chamber to a source of motor fluid, a movable housing connected to said block assembly, and flexible means for interconnecting said fixed housing to said movable housing; and means connecting said first pressure chamber to a source of motive fluid for expanding said first pressure chamber to move said drive means and said block assembly thereby driving said scribe into engagement with said paper.
Claim 2
Dependent Claim
162 words
A pen carriage for an automatic drafting machine in which the carriage is driven over a sheet of paper mounted on a drafting table comprising: a main carriage housing; a block assembly reciprocably mounted on said main carriage housing, said block assembly adapted to hold a scribe for writing on the paper; drive means for reciprocably driving said block assembly, said drive means including means forming a first pressure chamber, said means being drivingly connected to said block assembly, said means forming said first pressure chamber includes a fixed housing connected to said means connecting said first pressure chamber to a source of motor fluid, a movable housing connected to said block assembly, and flexible means for interconnecting said fixed housing to said movable housing; and means connecting said first pressure chamber to a source of motive fluid for expanding said first pressure chamber to move said drive means and said block assembly thereby driving said scribe into engagement with said paper.
Claim 3
Dependent Claim
50 words
The invention in accordance with claim 1 further including means for guiding said movable housing along the reciprocable movement, said guide means being located without said first pressure chamber, thereby enabling said first pressure chamber to be free of any sliding friction between said movable housing and said fixed housing.
Claim 4
Dependent Claim
34 words
The invention in accordance with claim 1 wherein said flexible housing means includes a diaphragm being sealingly connected at one end to said fixed housing and at the other end to said movable housing.
Claim 5
Dependent Claim
63 words
The invention in accordance with claim 3 further including: a compression spring having one end engaging said fixed housing; means connecting said movable housing to the other end of said compression spring, said spring being adapted to force said movable housing upwardly upon release of fluid pressure within said first pressure chamber, thereby moving said scribe out of engagement with said drafting paper.
Claim 6
Dependent Claim
75 words
The invention in accordance with claim 4 further inCluding means forming a second pressure chamber comprising: a second fixed housing integrally connected to said first housing; a second movable housing having one end engaged to the other end of said pressure spring; a second flexible means for interconnecting said second fixed housing to the other end of said second movable housing; and means for connecting said second pressure chamber to a source of motor fluid.
Claim 7
Dependent Claim
97 words
The invention in accordance with claim 5 whereby said second movable housing is coupled to said means connecting said first movable housing to the other end of said compression spring in such a manner that upon fluid pressure entering said second pressure chamber the second movable housing is driven downwardly against the compression of the source of said compression spring and said second movable housing permits said means connecting said first movable housing with said compression spring to fall downwardly by the force of gravity thereby permitting said first movable housing to also fall, due to gravity.
Claim 8
Dependent Claim
58 words
The invention in accordance with claim 6 wherein said means connecting said first and second pressure chambers to the source of fluid includes a valve having a first passageway adapted to communicate alternatively with one of said passageways connected to said source of fluid and a vent passageway adapted to communicate alternatively with the other of said passageways.
Claim 9
Dependent Claim
31 words
The invention in accordance with claim 7 wherein said valve means includes a rotary valve head having said first and second passageways being positioned 180* with respect to said moving axis.
Claim 10
Dependent Claim
16 words
The invention in accordance with claim 1 wherein said source of motor fluid is pressurized gas.
Claim 11
Dependent Claim
13 words
The invention in accordance with claim 9 wherein said pressurized gas is air.
Claim 12
Dependent Claim
70 words
The invention in accordance with claim 8 wherein said coupling means includes a first flange located on the lower end of said second movable housing and a second flange located on said means connecting said first movable housing to said other end of said compression spring, said second flange being mounted on said first flange and adapted to be drivingly moved upwardly upon upward movement of said second movable housing.
References Cited (Backward Citations)
US3058220A
Cited
US3353273A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-21 | 1975-08-23 | 1976-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-21 | 1979-08-23 | 1980-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-21 | 1983-08-23 | 1984-02-22 | $7700.00 | Window Closed / Lapsed |