US3687089A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drafting table with improved vertical control mechanism
Assignee: Corry Jamestown Corp
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Filing: 1969-05-09
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Granted: 1972-08-29
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Expires: 1989-05-09
Abstract
Abstract A drafting table is disclosed in the specification that has a drafting board supported on a desk for vertical movement. The board is supported on a yoke having vertically extending legs connected to a counterbalance and locking mechanism. The locking mechanism is made up of two upwardly extending rods each fixed to a side of the table adjacent one of the legs on the yoke. Each leg has a helical spring which slides on one of the rods and may be moved relative to the rod to lock the leg from sliding, thereby locking the board in the desired vertical position. A counterbalance mechanism made up of two energy cells is supported at each side of the table and interconnected by two concentric tubes which restrain the two energy cells to exert a force on the legs of the yoke which will move the yoke in translation.
Inventors
- 👤 Gene B Hasbrouck
- 👤 Alan L Green
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:11
CPC Classifications
A; A47; A47B; A47B27/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
172 words
A drafting table comprising a drafting board, a supporting structure, a yoke having two spaced legs mounted for vertical movement on said supporting structure, means supporting said drafting board on said yoke, lock means for holding said yoke at a selected vertical position, counterbalance means attached to said table said lock means comprising a vertically extending first rod and a vertically extending second rod each being fixed to said support means, one said rod being disposed adjacent each said leg, gripping means on each said leg adjacent each said rod and encircling each said rod, actuating means on each leg of said yoke for moving said gripping means to a first position at which said gripping means grips each said rod, said actuating means on said yoke being adapted to move said gripping means to a second position to permit said gripping means to freely slide over said rod to allow vertical movement of said yoke whereby said vertically extending rods also function to vertically guide said yoke in its vertical movement.
Claim 2
Dependent Claim
172 words
A drafting table comprising a drafting board, a supporting structure, a yoke having two spaced legs mounted for vertical movement on said supporting structure, means supporting said drafting board on said yoke, lock means for holding said yoke at a selected vertical position, counterbalance means attached to said table said lock means comprising a vertically extending first rod and a vertically extending second rod each being fixed to said support means, one said rod being disposed adjacent each said leg, gripping means on each said leg adjacent each said rod and encircling each said rod, actuating means on each leg of said yoke for moving said gripping means to a first position at which said gripping means grips each said rod, said actuating means on said yoke being adapted to move said gripping means to a second position to permit said gripping means to freely slide over said rod to allow vertical movement of said yoke whereby said vertically extending rods also function to vertically guide said yoke in its vertical movement.
Claim 3
Dependent Claim
144 words
The drafting table recited in claim 1 wherein said counterbalance means is provided on said drafting board for counterbalancing said drafting board in elevation movement, said counterbalance means comprises two energy cells, one said energy cell being supported on each side of said support, each said energy cell comprises a drum disposed adjacent each side of said table, a shaft and a spring, said spring being wrapped around said shaft and connected to said drum, a tube extending transversely of said table connecting said drums, being disposed on said shaft, said shaft being disposed in said drum, a transverse shaft connecting said shafts of said cells, and a first cable wrapped on one said drum, and a second cable wrapped on the oTher said drum, said cables being connected to said table legs whereby said drums are rotated when said table moves in elevation.
Claim 4
Dependent Claim
75 words
The drafting table recited in claim 1 wherein said counterbalance comprises cables attached to said legs, two energy cells are attached to said structure, said energy cells being adapted to exert a tensile force on said cable whereby the weight of said legs and said drafting board is counterbalanced, and means to restrict said cables to exert forces on said legs, biasing said legs upward to move said board in level relation to said support.
Claim 5
Dependent Claim
128 words
The mechanism recited in claim 1 wherein said vertical legs are supported on a support member for vertical planar movement thereon, said gripping means comprises a helical spring extending around each said rod and adapted to slide freely on said rod when in a first position, and to grip said rod in a second position, said helical spring being swingably fixed to each said support member, compression springs having means connected to them engaging each said helical spring, urging said helical spring to said second position whereby said helical spring locks said support member to said rod, means including a link connected to said helical spring to said compression spring whereby said compression spring is compressed by action of said third link and said helical spring is compressed.
Claim 6
Dependent Claim
89 words
The combination recited in claim 1 wherein said counterbalance means is provided to counterbalance said board at any selected vertical position, said counterbalance means comprising, two energy cells attached to said table, one at each side thereof, a line extending from each said energy cell, synchronizing means to restrain said lines to move the ends of said lines in unison, the distal end of each said line being attached to said board, said energy cells having means to exert a tension on said lines whereby said board is counterbalanced.
Claim 7
Dependent Claim
92 words
The combination recited in claim 5 wherein said energy cells have a center axis having a tension means thereon, a rod attached to transverse axis of each said energy cell, manual actuating means accessible from one side of said table for rotating said center axis whereby the tension of said tension means is increased, said synchronizing means comprises a tube concentrically disposed on said transverse rod, each said energy cell having a drum adapted to wrap said line means thereon, said tube having each of its ends attached to one said drum.
Claim 8
Dependent Claim
59 words
The drafting table recited in claim 1 wherein counterbalance means is provided for said yoke, said counterbalance means comprising a first energy cell and a second energy cell, means connecting said energy cells, said first energy cell being supported on said support at one side thereof and said second energy cell attached to the other side of said table.
Claim 9
Dependent Claim
111 words
The drafting board recited in claim 7 wherein each said energy cell comprises a spring, a shaft, a spring connected to said shaft, a first end, and a second end, each said spring being connected to a drum at a second end, a cable connecting each leg of said yoke to the outside of said drum, whereby said springs urge said yoke upward, a rod extending from one side of said table to the other and connecting the said shafts of said energy cells together, a tube disposed concentric to said rod, said tube connecting said drums together whereby said drums rotate in unison and said legs are moved upward evenly.
Claim 10
Dependent Claim
136 words
The drafting table recited in claim 1 wherein said counterbalance means is provided for said table, comprising two energy cells, each having an outside drum with a shaft thereon, said energy cells being supported on said table, a transverse tube connecting the said shafts together, a second tube concentric with said first tube, said second tube connecting and restraining said drums to rotate Together, a spring in each said energy cell, each said spring being wound on each said shaft and connected to the corresponding said drum, a first cable wound on said first drum, a second cable wound on said second drum, each said cable being connected to a said leg of said table whereby said legs are moved up and down at the same rate whereby said legs are moved straight up and down.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-29 | 1976-02-28 | 1976-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-29 | 1980-02-28 | 1980-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-29 | 1984-02-28 | 1984-08-29 | $7700.00 | Window Closed / Lapsed |