US3993280A — Drafting stool

Claim 1

Independent Claim 240 words

A drafting stool comprising: a. a base carrying floor-engaging wheels operable to support said base for linear movement in either of two opposite directions, and adapted to be placed before a drafting table for movement parallel to the forward edge of said table, b. a standard disposed above said base and projecting upwardly therefrom, c. means connecting the lower end of said standard to said base, said connecting means being pivotal to permit inclination of said standard from vertical in a vertical plane parallel to the direction of travel of said stool base, and including resilient means yieldably resisting said pivotal movement, d. a seat mounted on the upper end of said standard, e. a reversible prime mover mounted in said base, f. an operating connection between said prime mover and certain of said ground-engaging wheels, and g. control means whereby said prime mover may be started, stopped, and reversed, whereby said stool may be caused selectively to move in either direction in its line of travel, said control means including a pair of control devices carried by said base and operable to be actuated respectively by tilting of said standard in respectively opposite directions parallel to the direction of travel of said base, said control devices being operable when actuated to cause respectively opposite operation of said prime mover, whereby the occupant of the seat may actuate either control device by lurching slightly in one direction or the other.

Claim 2

Dependent Claim 240 words

A drafting stool comprising: a. a base carrying floor-engaging wheels operable to support said base for linear movement in either of two opposite directions, and adapted to be placed before a drafting table for movement parallel to the forward edge of said table, b. a standard disposed above said base and projecting upwardly therefrom, c. means connecting the lower end of said standard to said base, said connecting means being pivotal to permit inclination of said standard from vertical in a vertical plane parallel to the direction of travel of said stool base, and including resilient means yieldably resisting said pivotal movement, d. a seat mounted on the upper end of said standard, e. a reversible prime mover mounted in said base, f. an operating connection between said prime mover and certain of said ground-engaging wheels, and g. control means whereby said prime mover may be started, stopped, and reversed, whereby said stool may be caused selectively to move in either direction in its line of travel, said control means including a pair of control devices carried by said base and operable to be actuated respectively by tilting of said standard in respectively opposite directions parallel to the direction of travel of said base, said control devices being operable when actuated to cause respectively opposite operation of said prime mover, whereby the occupant of the seat may actuate either control device by lurching slightly in one direction or the other.

Claim 3

Dependent Claim 157 words

A drafting stool as recited in claim 1 wherein said standard is vertically extensible in length, and with the addition of a second reversible prime mover operable when actuated in respectively opposite directions to cause vertical extension or retraction of said standard, and a second control system for said second prime mover, said standard connecting means also permitting pivotal movement of said standard in a vertical plane transverse to the direction of travel of the base, and including resilient means yieldably resisting said transverse pivotal movement, said second control means including a pair of control devices carried by said base and operable to be actuated respectively by said transverse tilting of said standard in respectively opposite directions, said last-named control devices being operable when actuated to cause operation of said second prime mover in respectively opposite directions, whereby the occupant of the seat may raise or lower said seat by lurching his weight in the appropriate direction.

Claim 4

Dependent Claim 41 words

A drafting stool as recited in claim 2 with the addition of means operable to adjust the tension of said resilient means resisting tilting of said standard, both parallel to the direction of travel of said stool base, and transversely thereto.

Claim 5

Dependent Claim 26 words

A drafting stool as recited in claim 2 with the addition of a single manually operable control device operable to deactivate both of said prime movers.

Claim 6

Dependent Claim 165 words

A drafting stool as recited in claim 2 wherein said means connecting the lower end of said standard to said base comprises: a. a universal pivot connecting the lower end of the standard to the base, b. four arms projecting horizontally from said standard above said base, two of said arms extending parallel to the direction of base travel and two transversely thereto, c. a vertical screw threaded adjustably in the outer end portion of each of said arms and extending downwardly into a socket provided therefor in said base, and d. a compression spring disposed between the lower end of said screw and the base of said socket, said control devices controlling base travel being disposed beneath one opposite pair of said arms, and said control devices controlling the elevation of said seat being disposed beneath the other opposite pair of said arms, each of said control devices being engaged and actuated by its associate arm whenever said standard is tilted in that direction.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1979-11-23	1980-05-24	1980-11-23	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1983-11-23	1984-05-24	1984-11-23	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1987-11-23	1988-05-24	1988-11-23	$7700.00	Window Closed / Lapsed

Drafting stool

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