Patent US5325640A successfully refreshed from Google Patents.
US5325640A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Folding stage system
Assignee: Sico Inc
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Filing: 1991-08-09
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Granted: 1994-07-05
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Expires: 2011-08-09
Abstract
Abstract An elevationally adjustable folding stage has a frame which folds along a center of the stage from a storage position to a use position. Stage panels form a stage surface and are reversible and interchangeable. The stage may also support additional panels between stages extending therefrom to form an extended stage surface. The stage has a roller assembly which lifts the stage up so that rollers engage the floor for rolling between storage and use locations. Connectors between the frame and the stage offer quick connection without additional pieces. Connectors also provide for inserting risers to raise the height of one panel of the stage relative to the other. In addition to the risers, multi-panel supporting bases may be used to support the panels extending from the edges of the stage between stages. The panels between the stages may be stored on the stage while in the use or folded position by hook members which rotate from a storage to a use position to retain the additional panels. Folding of the stage is assisted by a spring folding assist member which prevents closing of the stage and assists in the initial opening of the stage toward the folded position. Accidental folding of the stage is also prevented by a locking linkage and a spacing linkage which lock the stage in the use position to prevent accidental folding and also to maintain the stage in the use position when elevationally adjusting the stage panels.
Inventors
- 👤 Thomas J. Luedke
- 👤 Randy G. Aagaard
- 👤 Carl A. Niemi
- 👤 Andrew J. Shea
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 07:44
CPC Classifications
E; E04; E04H; E04H3/00; E04H3/10; E04H3/12; E04H3/126; E04H3/22; E04H3/24; E04H3/28; Y; Y10; Y10T; Y10T403/00; Y10T403/45; Y10T403/453; Y10T403/455; Y10T403/457; Y10T403/54; Y10T403/55; Y10T403/557; Y10T403/70; Y10T403/7047; Y10T403/7051; Y10T403/7052; Y10T403/7056; Y10T403/7061
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
101 words
A folding stage, comprising: a pair of adjacent stage panels forming a stage surface; a folding framework, folding from a use position wherein the stage panels form a stage surface, to a storage position wherein the stage panels substantially oppose one another; detachable bridging panels having a first end mounting to the folding stage and extending from the folding stage for forming an extended stage surface; support legs supporting the framework; means for supporting detachable bridging panels from the stage; and, means for retaining the detachable bridging panels adjacent an outer surface of the stage panels in the folded storage position.
Claim 2
Dependent Claim
101 words
A folding stage, comprising: a pair of adjacent stage panels forming a stage surface; a folding framework, folding from a use position wherein the stage panels form a stage surface, to a storage position wherein the stage panels substantially oppose one another; detachable bridging panels having a first end mounting to the folding stage and extending from the folding stage for forming an extended stage surface; support legs supporting the framework; means for supporting detachable bridging panels from the stage; and, means for retaining the detachable bridging panels adjacent an outer surface of the stage panels in the folded storage position.
Claim 3
Dependent Claim
112 words
A folding stage comprising: a pair of adjacent stage panels forming a stage surface; a folding framework, folding from a use position wherein the stage panels form a stage surface, to a storage position wherein the panels substantially oppose one another; support legs supporting the framework; bridging panels having a first end mounting to the folding stage and extending from the stage for forming an extended stage surface; means for supporting the first end of the bridging panels from the stage; and, hook members mounting on the framework and swinging up to a retaining position for retaining a stage panel and a bridging panel when the stage is in the storage position.
Claim 4
Dependent Claim
112 words
A folding stage comprising: a pair of adjacent stage panels forming a stage surface; a folding framework, folding from a use position wherein the stage panels form a stage surface, to a storage position wherein the panels substantially oppose one another; support legs supporting the framework; bridging panels having a first end mounting to the folding stage and extending from the stage for forming an extended stage surface; means for supporting the first end of the bridging panels from the stage; and, hook members mounting on the framework and swinging up to a retaining position for retaining a stage panel and a bridging panel when the stage is in the storage position.
Claim 5
Dependent Claim
24 words
A folding stage according to claim 2, wherein the hook members swing below the stage panels when the stage is in the use position.
Claim 6
Dependent Claim
30 words
A folding stage according to claim 3, wherein the retaining means comprise hook members along a lower edge of the panels and hook members along the sides of the panels.
Claim 7
Dependent Claim
27 words
A folding stage according to claim 2, wherein the hook members further comprise handles for actuating the hook members between a storage position and a retaining position.
Claim 8
Dependent Claim
8 words
A folding stage according to claim 3, further
Claim 9
Dependent Claim
16 words
A folding stage according to claim 1, wherein the retaining means are mounted on the stage.
Claim 10
Dependent Claim
13 words
A folding stage according to claim 7, wherein the retaining means are retractable.
Claim 11
Dependent Claim
196 words
A folding stage, comprising: a pair of adjacent stage panels forming an extended stage surface; a framework, folding from a use position wherein the stage panels form a stage surface to a storage position wherein the panels substantially oppose one another; supporting legs including first and second legs supporting a first stage panel and opposed first and second legs supporting a second stage panel, corresponding to the first and second legs supporting the first storage panel; locking means for locking the stage in the use position, comprising a linkage extending between the first legs of the first and second stage panels, the linkage having a first linkage member coupled to the first leg of the first stage panel and a second linkage member coupled to the opposed first leg of the second stage panel, wherein the first and second linkage members are pivotally connected, and restraining means for preventing movement of the linkage past a predetermined position, wherein the linkage passes through a toggle point whereat the first and second linkage members are colinear so that the linkage members engage the restraining means and snap through the toggle point into locked engagement at the predetermined position.
Claim 12
Dependent Claim
196 words
A folding stage, comprising: a pair of adjacent stage panels forming an extended stage surface; a framework, folding from a use position wherein the stage panels form a stage surface to a storage position wherein the panels substantially oppose one another; supporting legs including first and second legs supporting a first stage panel and opposed first and second legs supporting a second stage panel, corresponding to the first and second legs supporting the first storage panel; locking means for locking the stage in the use position, comprising a linkage extending between the first legs of the first and second stage panels, the linkage having a first linkage member coupled to the first leg of the first stage panel and a second linkage member coupled to the opposed first leg of the second stage panel, wherein the first and second linkage members are pivotally connected, and restraining means for preventing movement of the linkage past a predetermined position, wherein the linkage passes through a toggle point whereat the first and second linkage members are colinear so that the linkage members engage the restraining means and snap through the toggle point into locked engagement at the predetermined position.
Claim 13
Dependent Claim
19 words
A folding stage according to claim 9, further comprising a spacing linkage between the opposed legs of each panel.
Claim 14
Dependent Claim
27 words
A folding stage according to claim 9, further comprising an actuating handle attached to one of the linkage members for urging the linkage through the toggle point.
Claim 15
Dependent Claim
29 words
A folding stage according to claim 9, wherein a pair of linkages extending between two sets of opposed legs are connected by a cross member extending between the linkages.
Claim 16
Dependent Claim
34 words
A folding stage according to claim 9, wherein the restraining means comprises a stop extending from the first linkage member and engaging the second linkage member upon the linkage passing through the toggle point.
Claim 17
Dependent Claim
90 words
A folding stage, comprising: first and second adjacent stage panels forming a stage surface; detachable spare panels; a framework, folding from a use position wherein the stage panels form a stage surface to a storage position wherein the panels substantially oppose one another; supporting legs; and, removable spacers of various heights insertable between the framework and the stage panels for raising the elevation of the first stage panel relative to the second stage panel means for retaining the detachable spare panels against the stage panels in the folded storage position.
Claim 18
Dependent Claim
90 words
A folding stage, comprising: first and second adjacent stage panels forming a stage surface; detachable spare panels; a framework, folding from a use position wherein the stage panels form a stage surface to a storage position wherein the panels substantially oppose one another; supporting legs; and, removable spacers of various heights insertable between the framework and the stage panels for raising the elevation of the first stage panel relative to the second stage panel means for retaining the detachable spare panels against the stage panels in the folded storage position.
Claim 19
Dependent Claim
25 words
A folding stage according to claim 14, further comprising a kick panel covering the opening between the first panel when elevated and the second panel.
Claim 20
Dependent Claim
19 words
A folding stage according to claim 14, wherein either stage panel may be elevated relative to the other panel.
Claim 21
Dependent Claim
69 words
A folding stage for storing detachable spare panels, comprising: a pair of adjacent stage panels forming a stage surface; a folding framework, folding from a use position wherein the stage panels form a stage surface, to a storage position wherein the stage panels substantially oppose one another; support legs supporting the framework; and means for retaining the detachable spare panels against the stage panels in the folded storage position.
Claim 22
Dependent Claim
69 words
A folding stage for storing detachable spare panels, comprising: a pair of adjacent stage panels forming a stage surface; a folding framework, folding from a use position wherein the stage panels form a stage surface, to a storage position wherein the stage panels substantially oppose one another; support legs supporting the framework; and means for retaining the detachable spare panels against the stage panels in the folded storage position.
Claim 23
Dependent Claim
35 words
A stage according to claim 17, wherein the spare panel retaining means comprise hook members mounting on the framework and swinging up to a retaining position for retaining a spare panel against a stage panel.
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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) | 1997-07-04 | 1998-01-03 | 1998-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-07-04 | 2002-01-03 | 2002-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-07-04 | 2006-01-03 | 2006-07-05 | $7700.00 | Window Closed / Lapsed |