US3709535A — Hinge iron for posture chair

Claim 1

Independent Claim 243 words

A spring-biassed hinge iron which comprises: a first hinge bracket including a base web and spaced apart side flanges; a second hinge bracket including a base web and spaced apart side flanges; a pivot Pin extending through said side flanges of each of said first and second hinge brackets pivotally to interconnect said hinge brackets with said base webs and said side flanges thereof generally defining an enclosure; a helical torsion spring disposed about said pivot pin, having first and second axially spaced apart extension fingers and accommodated generally within said enclosure defined by said hinge brackets, said first and second extension fingers of said torsion spring terminating on the same side of said pivot pin; securing means securing respective said extension fingers of said helical torsion spring to said first hinge brackets, whereby said first and second hinge brackets are effectively spring-biassed by said torsion spring against relative pivotal opening movement about said pivot pin; locking bar means extending through at least part of said first and second hinge brackets and being transversely movable between locked and released positions for locking or permitting relative hingeing movement between said hinge brackets; bar securing spring means associated with said locking bar means for holding same in either said position; a first mounting means on said first hinge bracket for securing it to a first structural member; and a second mounting means on said second hinge bracket for securing it to a second structural member.

Claim 2

Dependent Claim 243 words

A spring-biassed hinge iron which comprises: a first hinge bracket including a base web and spaced apart side flanges; a second hinge bracket including a base web and spaced apart side flanges; a pivot Pin extending through said side flanges of each of said first and second hinge brackets pivotally to interconnect said hinge brackets with said base webs and said side flanges thereof generally defining an enclosure; a helical torsion spring disposed about said pivot pin, having first and second axially spaced apart extension fingers and accommodated generally within said enclosure defined by said hinge brackets, said first and second extension fingers of said torsion spring terminating on the same side of said pivot pin; securing means securing respective said extension fingers of said helical torsion spring to said first hinge brackets, whereby said first and second hinge brackets are effectively spring-biassed by said torsion spring against relative pivotal opening movement about said pivot pin; locking bar means extending through at least part of said first and second hinge brackets and being transversely movable between locked and released positions for locking or permitting relative hingeing movement between said hinge brackets; bar securing spring means associated with said locking bar means for holding same in either said position; a first mounting means on said first hinge bracket for securing it to a first structural member; and a second mounting means on said second hinge bracket for securing it to a second structural member.

Claim 3

Dependent Claim 67 words

A spring-biassed hinge iron as claimed in claim 1 including first and second securing means adapted adjustably to secure a respective one of said first and second extension fingers of said torsion spring to a respective one of said first and second hinge brackets to adjust the action of said torsion spring in biassing said first and second hinge brackets against said relative pivotal opening movement thereof.

Claim 4

Dependent Claim 72 words

A spring-biassed hinge iron as claimed in claim 1 in which said second hinge bracket is adapted to have an elongated second said structural member adjustably secured thereto by said second mounting means for longitudinal adjustment of said second structural member relative to said second hinge bracket between said side flanges thereof and for bodily pivotal adjustment of said elongated structural member about a pivot axis generally parallel to said pivot pin.

Claim 5

Dependent Claim 137 words

A spring-biassed hinge iron as claimed in claim 3 in which said side flanges of said second hinge bracket extend rearwardly of a rearward edge of said base web of said first hinge bracket, and which hinge additionally comprises a pair of clamping shoes pivotally mounted on the rearward extensions of said side flanges of said second hinge bracket between said side flange extensions thereof and about a pivot axis generally parallel to said pivot pin, said shoes being provided in opposed faces thereof with mating surfaces defining a recess in which said elongated second structural member is receivable, and releasable clamping means associated with said extensions of said side flanges of said second hinge bracket and adapted releasably to hold said extensions together so as releasably to clamp the elongated structural member between said clamping shoes.

Claim 6

Dependent Claim 99 words

A spring-biassed hinge iron as claimed in claim 1 in which said torsion spring comprises two axially spaced apart sections of opposite handednesses terminating generally centrally along said pivot pin in rearwardly extending generally tangential extension fingers which are secured to said first hinge bracket by a first said securing means, and said torsion spring sections terminating at their axially outer ends in generally tangential rearward extension fingers which are integrally formed with and interconnected at their outer ends by a transverse section which is in turn secured to said second hinge bracket by a second said securing means.

Claim 7

Dependent Claim 154 words

A spring-biassed hinge iron as claimed in claim 5 in which said first securing means comprises a transverse element extending between said side flanges of said first hinge bracket rearwardly of said pivot pin and generally terminally engaging said fIrst extension fingers of said torsion spring with said first extension fingers disposed between said transverse element and said base web of said first hinge bracket, and in which said second securing means comprises a shoe engaging said transverse section interconnecting said second extension fingers of said torsion spring and disposed between said shoe and said base web of said second hinge bracket, and a screw means interconnecting said web of said second hinge bracket and said shoe whereby said shoe can be positionally adjusted relative to said second hinge bracket in turn to adjust the spring bias restraining relative angular pivotal opening movement of said first and second hinge brackets about said pivot pin.

Claim 8

Dependent Claim 104 words

A spring-biassed hinge iron as claimed in claim 6 wherein said locking bar extends through aligned openings in said side flanges of both said first and second hinge brackets for transverse movement between released and locking positions essentially to prevent relative pivotal movement of said hinge brackets when said locking bar is disposed in said locking position but to allow such relative pivotal movement of said first and second hinge brackets when said locking bar is disposed in said released position thereof, and including notch means in said locking bar registering with portions of at least one of said flanges in said released position.

Claim 9

Dependent Claim 42 words

A spring-biassed hinge iron as claimed in claim 7 wherein said bar securing spring means comprises a spring blade member and having detent means formed therein adapted releasably to retain said locking bar in either of said released and locking positions thereof.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1976-01-09	1976-07-10	1977-01-09	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1980-01-09	1980-07-10	1981-01-09	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1984-01-09	1984-07-10	1985-01-09	$7700.00	Window Closed / Lapsed

Hinge iron for posture chair

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