Patent US6070367A successfully refreshed from Google Patents.
US6070367A
Expired / Lapsed
US
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Folding stage
Assignee: Sico Inc
•
Filing: 1997-08-01
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Granted: 2000-06-06
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Expires: 2017-08-01
Abstract
Abstract A folding stage includes a folding linkage with cross members and a center lock. The center lock has a handle below the cross members and off to the side of the cross members to prevent pinching of operators' hands and fingers. The folding linkage folds from a use position wherein stage decks are horizontal to form a stage surface to a storage position wherein the bottom of the stage decks oppose one another. In the fully folded position, stage support legs are angled inward slightly. Casters mount at an oblique angle to the telescoping legs and are moved closer to the telescoping legs to decrease the moment of inertia about the legs while maintaining sufficient contact with the floor. Torsion bars mount at the pivoting access of the frame and the telescoping legs to control folding speed. The folding portions of the frame and decks have a center of gravity which is aligned with the pivoting access to decrease the moment of inertia about the pivoting axis.
Inventors
- 👤 Walter R. Wagner
- 👤 Mark DeSimone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:04
CPC Classifications
E; E04; E04H; E04H3/00; E04H3/10; E04H3/22; E04H3/24; E04H3/28
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
134 words
An elevationally adjustable folding stage, comprising: a frame; a pair of stage decks having an upper surface and a lower surface; telescoping legs mounted to the frame; a folding linkage having cross links for folding the stage from a use position wherein the stage decks extend horizontally and the telescoping legs extend vertically, and a storage position wherein the lower surfaces of the stage decks oppose one another and the telescoping legs angle toward one another at an upper end; and a center lock having a spacing linkage with an inner spacing linkage link and an outer spacing linkage link extending between opposed telescoping legs, and a stop mounted to a pivot pin extending between the spacing linkage links, the stop having a handle extending above and outward beyond the outer spacing linkage link.
Claim 2
Dependent Claim
134 words
An elevationally adjustable folding stage, comprising: a frame; a pair of stage decks having an upper surface and a lower surface; telescoping legs mounted to the frame; a folding linkage having cross links for folding the stage from a use position wherein the stage decks extend horizontally and the telescoping legs extend vertically, and a storage position wherein the lower surfaces of the stage decks oppose one another and the telescoping legs angle toward one another at an upper end; and a center lock having a spacing linkage with an inner spacing linkage link and an outer spacing linkage link extending between opposed telescoping legs, and a stop mounted to a pivot pin extending between the spacing linkage links, the stop having a handle extending above and outward beyond the outer spacing linkage link.
Claim 3
Dependent Claim
31 words
A stage according to claim 1, wherein the handle is directly accessible from an end of the stage in the folded position without reaching between the links of the folding linkage.
Claim 4
Dependent Claim
46 words
A stage according to claim 1, wherein the flange engages the outer spacing linkage link and the tab engages the inner spacing linkage link when the spacing linkage passes through a toggle point to lock the spacing linkage, thereby locking the stage in an unfolded position.
Claim 5
Dependent Claim
20 words
A stage according to claim 1, wherein the stop includes a tab extending inward above the inner spacing linkage link.
Claim 6
Dependent Claim
125 words
An elevationally adjustable folding stage, comprising: a frame; a pair of stage decks having an upper surface and a lower surface; telescoping legs mounted to the frame; a folding linkage having cross links for folding the stage from a use position wherein the stage decks extend horizontally, and a storage position wherein the lower surfaces of the stage decks oppose one another; a spacing linkage extending between opposed telescoping legs and having an inner link and an outer link connected by a pivot pin; and a center lock mounted to the pivot pin intermediate the inner and outer spacing linkage links, wherein the center lock includes a flange extending above the outer spacing linkage link and a tab extending above the inner spacing linkage link.
Claim 7
Dependent Claim
125 words
An elevationally adjustable folding stage, comprising: a frame; a pair of stage decks having an upper surface and a lower surface; telescoping legs mounted to the frame; a folding linkage having cross links for folding the stage from a use position wherein the stage decks extend horizontally, and a storage position wherein the lower surfaces of the stage decks oppose one another; a spacing linkage extending between opposed telescoping legs and having an inner link and an outer link connected by a pivot pin; and a center lock mounted to the pivot pin intermediate the inner and outer spacing linkage links, wherein the center lock includes a flange extending above the outer spacing linkage link and a tab extending above the inner spacing linkage link.
Claim 8
Dependent Claim
20 words
A stage according to claim 5, wherein the flange comprises a handle extending outward beyond the outer spacing linkage link.
Claim 9
Dependent Claim
46 words
A stage according to claim 5, wherein the flange engages the outer spacing linkage link and the tab engages the inner spacing linkage link when the spacing linkages passes through a toggle point to lock the spacing linkage, thereby locking the stage in an unfolded position.
Claim 10
Dependent Claim
20 words
A stage according to claim 7, wherein the flange comprises a handle extending outward beyond the outer spacing linkage link.
References Cited (Backward Citations)
US24454A
Cited
US89306A
Cited
US587518A
Cited
US770152A
Cited
US1370732A
Cited
US1614539A
Cited
US2212938A
Cited
US2258133A
Cited
US2249455A
Cited
US2278817A
Cited
US2368748A
Cited
US2514524A
Cited
US2508627A
Cited
US2596250A
Cited
US2645539A
Cited
US2621095A
Cited
US2766089A
Cited
US2764460A
Cited
USRE24454E
Cited
US2747958A
Cited
US2771937A
Cited
US2739860A
Cited
US2782075A
Cited
US2983968A
Cited
US2873157A
Cited
US2831741A
Cited
US2993740A
Cited
US2887348A
Cited
US3028197A
Cited
US3338726A
Cited
US2969245A
Cited
US2977169A
Cited
US3027209A
Cited
US2978754A
Cited
US3034843A
Cited
US3075809A
Cited
US3080833A
Cited
US3099480A
Cited
US3143982A
Cited
US3245363A
Cited
US3276401A
Cited
US3351029A
Cited
US3437058A
Cited
US3476061A
Cited
US3557720A
Cited
US3799073A
Cited
US3861325A
Cited
US3903812A
Cited
FR2314315A1
Cited
US4026221A
Cited
US3999491A
Cited
US4074636A
Cited
US4054096A
Cited
US4104835A
Cited
US4133271A
Cited
FR2418319A1
Cited
US4327650A
Cited
US4232488A
Cited
US4590865A
Cited
FR2554476A1
Cited
US4638604A
Cited
US4570751A
Cited
DE8428611U1
Cited
US4615279A
Cited
FR2587784A1
Cited
US4627364A
Cited
US4779878A
Cited
US4995679A
Cited
US4811530A
Cited
US4979340A
Cited
US4779542A
Cited
USD307186S
Cited
US4872295A
Cited
USD304499S
Cited
US4863126A
Cited
US4934113A
Cited
US4917217A
Cited
EP0389932A1
Cited
US4949649A
Cited
US5050353A
Cited
US5050353C1
Cited
US5325640A
Cited
US5367963A
Cited
US5317842A
Cited
US5323563A
Cited
US5615451A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2003-06-06 | 2003-12-06 | 2004-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-06-06 | 2007-12-06 | 2008-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-06-06 | 2011-12-06 | 2012-06-06 | $7700.00 | Window Closed / Lapsed |