Patent US3994464A successfully refreshed from Google Patents.
US3994464A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Internally wired counter-balanced bracket
Assignee: Individual
•
Filing: 1976-01-09
•
Granted: 1976-11-30
•
Expires: 1996-01-09
Abstract
Abstract In that type of extensible, tiltable counter-balanced lamp bracket in which three degrees of freedom are provided about a balance point, the mechanism which furnishes the 3° of freedom also provides a hollow encompassing the balance point, so that connectors may be drawn directly therethrough. A hollow link extends from the balance point to a fulcrum hinge at which it mounts the principal counter-balanced arm. The arm there is directed into two portions offset from the center plane. The offsets of the principal arm provide a slot in which the link means is accommodated when the extensible bracket is folded.
Inventors
- 👤 Albert C. Perbal, deceased
- 👤 by Martha Louise Perbal
- 👤 Co-Executors Mercantile Trust Company National Association
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:16
CPC Classifications
F; F21; F21S; F21S6/00; F21S6/002; F21S6/003; F21V; F21V21/00; F21V21/14; F21V21/26; F21V21/28
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
317 words
In a counter-balanced extensible bracket of the type having a balance point relative to which three degrees of freedom of angular movement are provided, link means supported at said balance point having a link line extending to a fulcrum hinge, a principal hollow arm mounted to said hinge, the arm having an aft extending counter-weighted portion and a forward extending portion terminating in an elbow joint to which a supplementary hollow arm is hinged, with a supported electrical element mounted to said supplementary arm, further having means to maintain substantial parallelism between said supplementary arm and said link line, said means connecting the supplementary arm and the link means at points thereof spacedly offset from the elbow joint and the fulcrum hinge respectively, the improvement adapted to permit drawing of electrical connectors internally, comprising base means spaced from such balance point to establish a support axis intersecting such point, said base means having on said axis a base swivel, and a hollow support member mounted for swiveling therein and whose upper end has hollow means offset laterally from such balance point to provide trunnion-like support about a lateral axis through such support point, and in which said link means includes a first link portion comprising a hollow trunnion part mounted laterally in said means to provide trunnion-like support and communicating with and terminating in a hollow stub shaft end formed about a center-plane axis perpendicular to and which intersects said lateral axis at such balance point, and a second link portion having an end at said fulcrum hinge and having a swivel socket end mounted about said stub shaft end at a position spaced axially from such support point, said second link portion further having a hollow extending from its said socket end to an outlet at said fulcrum hinge, said connection of said parallelism-maintaining means to the link means being made to said second link portion.
Claim 2
Dependent Claim
317 words
In a counter-balanced extensible bracket of the type having a balance point relative to which three degrees of freedom of angular movement are provided, link means supported at said balance point having a link line extending to a fulcrum hinge, a principal hollow arm mounted to said hinge, the arm having an aft extending counter-weighted portion and a forward extending portion terminating in an elbow joint to which a supplementary hollow arm is hinged, with a supported electrical element mounted to said supplementary arm, further having means to maintain substantial parallelism between said supplementary arm and said link line, said means connecting the supplementary arm and the link means at points thereof spacedly offset from the elbow joint and the fulcrum hinge respectively, the improvement adapted to permit drawing of electrical connectors internally, comprising base means spaced from such balance point to establish a support axis intersecting such point, said base means having on said axis a base swivel, and a hollow support member mounted for swiveling therein and whose upper end has hollow means offset laterally from such balance point to provide trunnion-like support about a lateral axis through such support point, and in which said link means includes a first link portion comprising a hollow trunnion part mounted laterally in said means to provide trunnion-like support and communicating with and terminating in a hollow stub shaft end formed about a center-plane axis perpendicular to and which intersects said lateral axis at such balance point, and a second link portion having an end at said fulcrum hinge and having a swivel socket end mounted about said stub shaft end at a position spaced axially from such support point, said second link portion further having a hollow extending from its said socket end to an outlet at said fulcrum hinge, said connection of said parallelism-maintaining means to the link means being made to said second link portion.
Claim 3
Dependent Claim
68 words
In a counter-balanced extensible bracket, the improvement as defined in claim 1, wherein said center plane axis of said first link portion, about which said second link portion swivels, diverges angularly from said link line, whereby the said center plane axis will remain out of coincidence with the vertical axis when said link line is raised to vertical, thereby confining vertical swiveling to movement about the base swivel.
Claim 4
Dependent Claim
54 words
In a counter-balanced extensible bracket, the improvement as defined in claim 2, wherein the principal hollow arm has a offset sideward from said center plane and extending an said fulcrum hinge toward the counter-weighted portion, whereby to accommodate said second link portion when the supplementary arm is folded closely adjacent to the principal arm.
Claim 5
Dependent Claim
65 words
In a counter-balanced extensible bracket, the improvement as defined in claim 3, wherein said principal arm offset includes portions on both sides of said center plane, whereby to provide a slot in which the said second link portion is so accommodated, and wherein said fulcrum hinge includes rotation-permitting means acting between both said offset arm portions and the end of the second link portion thereat.
Claim 6
Dependent Claim
110 words
In a counter-balanced extensible bracket, the improvement as defined in claim 3, wherein said second link portion is formed of two members mating at said center plane and which at the fulcrum hinge have clevis ends offset therefrom, the said fulcrum hinge outlet of the link hollow being at one clevis end and extending laterally inward toward the center plane, and in which the hollow principal arm has, extending aft to the fulcrum hinge axis and between said clevis ends, a hollow center plane member, whereby to permit drawing electrical connectors through the link and its said hollow clevis into said center plane member and thence into the hollow arm.
Claim 7
Dependent Claim
289 words
In a counter-balanced extensible bracket of the type having a balance point relative to which three degrees of freedom of angular movement are provided, link means supported at said balance point having a link line extending to a fulcrum hinge, a principal hollow arm mounted to said hinge, the arm having an aft extending counter-weighted portion and a forward extending portion terminating in an elbow joint to which a supplementary hollow arm is hinged, with a supported electrical element mounted to said supplementary arm, further having means to maintain substantial parallelism between said supplementary arm and said link line, said means connecting the supplementary arm and the link means at points thereof spacedly offset from the elbow joint and the fulcrum hinge respectively. the improvement adapted to permit drawing of electrical connectors internally, comprising base means spaced from such balance point to establish a vertical axis intersecting such point, said base means having on said axis a base swivel, and a hollow support member mounted for swiveling therein and whose upper end has hollow means offset from such balance point to provide pivotal support about a horizontal axis through such support point, the said link means being hollow from said offset means to said fulcrum hinge, that end of said link means nearest the balance point being provided with means, offset from the support point and having a hollow encompassing the support point, to provide a range of angular movement of the link means about a third axis perpendicular to such horizontal axis and out of coincidence with said vertical axis, whereby connectors may be carried through said hollow support member and through the balance point and link means to said fulcrum hinge and thence to said hollow arms.
Claim 8
Dependent Claim
289 words
In a counter-balanced extensible bracket of the type having a balance point relative to which three degrees of freedom of angular movement are provided, link means supported at said balance point having a link line extending to a fulcrum hinge, a principal hollow arm mounted to said hinge, the arm having an aft extending counter-weighted portion and a forward extending portion terminating in an elbow joint to which a supplementary hollow arm is hinged, with a supported electrical element mounted to said supplementary arm, further having means to maintain substantial parallelism between said supplementary arm and said link line, said means connecting the supplementary arm and the link means at points thereof spacedly offset from the elbow joint and the fulcrum hinge respectively. the improvement adapted to permit drawing of electrical connectors internally, comprising base means spaced from such balance point to establish a vertical axis intersecting such point, said base means having on said axis a base swivel, and a hollow support member mounted for swiveling therein and whose upper end has hollow means offset from such balance point to provide pivotal support about a horizontal axis through such support point, the said link means being hollow from said offset means to said fulcrum hinge, that end of said link means nearest the balance point being provided with means, offset from the support point and having a hollow encompassing the support point, to provide a range of angular movement of the link means about a third axis perpendicular to such horizontal axis and out of coincidence with said vertical axis, whereby connectors may be carried through said hollow support member and through the balance point and link means to said fulcrum hinge and thence to said hollow arms.
Claim 9
Dependent Claim
217 words
In a counter-balanced extensible bracket of the type having a balance point relative to which more than one degree of freedom of angular movement is provided, link means supported at said balance point having a link line extending therefrom to a fulcrum hinge, and a principal hollow arm mounted to said hinge, the arm having an aft extending counter-weighted portion, the improvement adapted to permit accommodation of electrical connectors within said fulcrum hinge, so that hinge movement is accommodated by flexure of the connectors and without displacement thereof, characterized in that the principal arm has offsets sideward from its center plane and extending aft to a counter-weighted portion, said offsets being on both sides of said center plane, whereby to provide a slot in which the link means may be accommodated, the offsets having fulcrum support means aligned with each other on a lateral fulcrum axis, and in which said link means includes two members mating at said center plane, and providing a hollow in which connectors may be drawn, said members having fulcrum means on their outer sides mating with those fulcrum means of the offset arm portions, at least one of said members having a hollow along said fulcrum axis through which connectors with the link means may extend to enter into the principal arm.
Claim 10
Dependent Claim
217 words
In a counter-balanced extensible bracket of the type having a balance point relative to which more than one degree of freedom of angular movement is provided, link means supported at said balance point having a link line extending therefrom to a fulcrum hinge, and a principal hollow arm mounted to said hinge, the arm having an aft extending counter-weighted portion, the improvement adapted to permit accommodation of electrical connectors within said fulcrum hinge, so that hinge movement is accommodated by flexure of the connectors and without displacement thereof, characterized in that the principal arm has offsets sideward from its center plane and extending aft to a counter-weighted portion, said offsets being on both sides of said center plane, whereby to provide a slot in which the link means may be accommodated, the offsets having fulcrum support means aligned with each other on a lateral fulcrum axis, and in which said link means includes two members mating at said center plane, and providing a hollow in which connectors may be drawn, said members having fulcrum means on their outer sides mating with those fulcrum means of the offset arm portions, at least one of said members having a hollow along said fulcrum axis through which connectors with the link means may extend to enter into the principal arm.
Claim 11
Dependent Claim
136 words
The improvement as defined in claim 7, further characterized in that at that end of the link means at which said fulcrum means acts, the said two members of the link means have clevis ends offset from the center plane, and in that the said hollow along the fulcrum axis extends inward toward the center plane, and in that the fulcrum hinge includes a hollow center plane member mounted to the principal arm forwardly of the fulcrum axis and extending aft between said clevis ends, whereby although fulcrum hinge support of the principal arm is provided to said offset arm portions outwardly of said clevis ends, the hollow through which electrical connectors may be drawn extends from said one clevis end inwardly to and through said hollow center plane member and thence into the principal arm.
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) | 1979-11-30 | 1980-05-31 | 1980-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-11-30 | 1984-05-31 | 1984-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-11-30 | 1988-05-31 | 1988-11-30 | $7700.00 | Window Closed / Lapsed |