WO2000040825A1 - Adjustable linkage - Google Patents
Adjustable linkage Download PDFInfo
- Publication number
- WO2000040825A1 WO2000040825A1 PCT/US2000/000102 US0000102W WO0040825A1 WO 2000040825 A1 WO2000040825 A1 WO 2000040825A1 US 0000102 W US0000102 W US 0000102W WO 0040825 A1 WO0040825 A1 WO 0040825A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- link
- linkage
- bolt
- pivot member
- nut
- Prior art date
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H3/00—Buildings or groups of buildings for public or similar purposes; Institutions, e.g. infirmaries or prisons
- E04H3/10—Buildings or groups of buildings for public or similar purposes; Institutions, e.g. infirmaries or prisons for meetings, entertainments, or sports
- E04H3/22—Theatres; Concert halls; Studios for broadcasting, cinematography, television or similar purposes
- E04H3/24—Constructional features of stages
- E04H3/28—Shiftable or portable platforms
Definitions
- the present invention is directed to a folding stage, and in particular, to a stage having an adjustable spacing linkage for locking and adjusting the position and alignment of the stage decks.
- Prior Art Folding stages are used for a variety of purposes to provide a temporary raised platform for use in schools, hotels, convention centers and other institutions or multiple use facilities requiring the capability of setting up temporary stages. Such stages may be positioned adjacent one another to form a stage surface or positioned to support bridging decks between the stages to form an extended stage surface. When not in use, the stages have a framework that folds to compact dimensions for better storage. Stages typically have two stage decks hinged together along a center line to provide folding action with legs that remain substantially vertical when the stage decks fold. An example of such a folding stage is shown in U.S. Patent No.
- Luedke et al. 5,325,640 to Luedke et al., issued July 5, 1994, and assigned to Sico, Incorporated, the Assignee of the present invention.
- the Luedke et al. patent shows a useful and efficient folding stage, further improvements are still possible, particularly with locking and aligning folding stages.
- Prior stages typically utilize a bolt at the center line of the stage that acts as a stop where the two deck frameworks come together along the folding center line. Adjustment of the stop adjusts the relative position of the frame and the decks.
- These types of stages also use a spacing linkage to apply tension to the stage in the use position to prevent accidental folding and to take up any looseness that would allow the stage to wobble or shift. As this linkage passes through a toggle position to a locked position, the decks are pulled to a slightly concave alignment before they revert back to level.
- the leveling bolt acts as a spring with an extremely high spring constant that must be compressed before it can return to the level position.
- this configuration prevents folding and does provide some alignment, it does not always provide adequate compression, forcing other portions of the linkage to have some play in order to allow the linkage to pass through the toggle position.
- the components may wear and/or loosen, changing alignment so that the bracing of the framework is less rigid and has even more play. This condition results in a stage feeling less stable in the unfolded use position.
- a spacing linkage includes a stop to lock the stage at a desired use position. If the spacing linkage can be adjusted, the alignment of the decks may be maintained or realigned by changing the final stop position of the spacing linkage. As the final resting position of the spacing linkage is slightly below horizontal after passing through a toggle position so that the spacing linkage snaps into a locked position, the various links in the linkage and the relative positioning points provide choices for adjustment. As shown in Figure 1, the vertical distance below horizontal may be adjusted or the length of the pivot links may be changed. The horizontal distance is generally fixed as the stage framework is typically fixed.
- a 2 plus B 2 equals C 2 where A is the horizontal distance between the center point and the outer pivot position of the spacing linkage; B is the vertical distance below the horizontal at the stop position; and C is the length of the link.
- the adjustment of the link C changes at least one of the other factors. Since B is substantially constant, a smaller change in C will result in a greater change in A, governed by the formula A equals the square root of (C 2 - B 2 ), wherein B 2 is substantially constant. Therefore, a small adjustment in the distance of the link will provide a greater adjustment in the relative position of the vertical stop position of the spacing linkage and overall alignment of the stage.
- an adjustable vertical member providing direct vertical adjustment at the center of the linkage may not be sufficient to correct misalignment in the stage.
- An improved folding stage should provide a locking and spacing mechanism that can be easily adjusted that does not cause the components to loosen and lead to wobbling and a less stable stage.
- the spacing linkage should provide sufficient adjustability to provide proper alignment of the stage decks in the use position. The present invention addresses these as well as other problems associated with spacing linkages.
- the present invention is directed to a folding stage having a spacing linkage that is adjustable.
- An elevationally adjustable folding stage includes a pair of decks that form a horizontal stage surface and a supporting framework and legs.
- the stage folds along a center line from a use position wherein the decks are horizontal to a storage position wherein the undersides of the deck substantially oppose one another.
- the folding is facilitated by a folding linkage providing folding along the center line and maintaining the legs in a substantially vertical position.
- the stage is locked in its use position by a locking or spacing linkage extending between opposed legs.
- the spacing linkage passes through a toggle point to a stop position with the links extending slightly below horizontal.
- the weight and balance of the stage tends to push the links further below horizontal.
- a tab from one link extends over and engages the top of another link so that the linkage acts as a stop, maintaining the stage in a folded position.
- one of the links provides for adjusting its overall length, thereby changing the final stop position of the stop linkage.
- the adjustable link includes an adjustment device at one end.
- the adjustment device includes a retainer housing with a block slidably mounted therein.
- the block includes a bore formed transversely therethrough that is aligned with a longitudinal opening in the sides of the retainer portion and receives a pivot pin.
- the block is maintained in a position by a bolt extending out the end of the retainer portion.
- the bolt is threadably retained in the sliding block.
- a first nut and second nut are positioned on the bolt outside of the retainer portion and tightened against the end of the retainer portion to position the bolt, and therefor the pivot point. Since the linkage is under tension, it is not necessary to provide positioning of the sliding block with regard to the opposite direction.
- the first nut acts as a positioning member relative to the retainer portion while the second nut acts as a lock on the first nut. With this configuration, accidental changes in the position of the bolt are not possible.
- the adjustment of the length of the spacing linkage link provides a greater change in distance in the vertical position of the linkage and therefor, in the vertical position of the center of the stage in the use position. Therefore, minor adjustments in the stage translate into greater adjustments in the relative position of the decks so that alignment can be maintained.
- Figure 2 shows a perspective view of a folding stage with an adjustable spacing linkage according to the principles of the present invention
- Figure 3 shows a front elevational view of the folding stage shown in Figure 2;
- Figure 4 shows a detail view of an adjustment portion of a link for the spacing linkage shown in Figure 2;
- Figure 5 shows a front elevational view of the stage shown in Figure
- Figure 6 shows a detail view of the adjustment portion for the spacing linkage in the position shown in Figure 5;
- Figure 7 shows a top plan view of a link having an adjustment portion for the spacing linkage of the stage shown in Figure 2;
- Figure 8 shows a side elevational view of the link shown in Figure 7;
- Figure 9 shows a partially exploded view of the link shown in Figure
- the folding stage 20 includes a pair of stage decks 22 that form an extended stage surface in the use position as shown, and fold so that the undersides of the decks substantially oppose one another in the folded storage position.
- the decks 22 are supported on a folding frame 24 and legs 26.
- the frame 24 folds with a linkage 28 extending between the opposed portions of the frame 24 to create a center line substantially aligned below the intersection of the decks 22.
- Center links 42 and 44 shown in Figures 3 and 5, provide pivoting along the center axis between the use and storage positions.
- the frame 24 folds about the legs 26 substantially at pivot points 30 and may include torsion bars (not shown) to aid in guiding the stage 20 during folding and unfolding.
- the lower links of the linkage 28 connect to the frame 30 through linkage mounts 34.
- the legs 26 include telescoping portions 36 that provide for elevational adjustment set with adjustment pins 38.
- An actuator handle 40 provides for folding the linkage 28 between the use and storage positions.
- a locking or spacing linkage 50 provides a stop point for the folding stage 20 so that the decks 22 are maintained with a substantially planar horizontal upper surface in the use position.
- the spacing linkage 50 also serves as a lock to maintain the stage 20 in the unfolded use position.
- the spacing linkage 50 passes through a toggle point and its links 52 and 54 are actually directed slightly below horizontal in the use position. It can be appreciated that the frame 24 supports the decks 22 so that they angle slightly downward towards the center line. This results in an uneven upper stage surface.
- the stage 20 be adjusted accordingly, such as to an improved position similar to that shown in Figure 5. The alignment is improved by approximately three degrees from the position shown in Figure 3 to the position shown in Figure 5.
- the spacing linkage 50 includes an adjustable link 52 mounting to a second link 54 at a center pin 78.
- the adjustable link 52 includes an adjustment mechanism 56 for varying the length of the adjustment link in the position of the spacing linkage 50.
- a locking tab 76 on the second link 54 extends over and engages the top of the adjustable link 52 and stops further pivoting of the spacing linkage 50.
- the spacing linkage 50 has passed through a toggle point at horizontal and is held in position by the weight of the stage 20 tending to push the spacing linkage 50 further downward, but the locking tab 76 stops further movement.
- the adjustment link 52 mounts to the center pivot pin 78 and the second link 54 at one end and at the adjustment mechanism 56 to a pivot pin 74 on the other end.
- the adjustment mechanism 56 includes a housing type retainer portion 58 having an open top and bottom, the retainer portion 58 also has side portions with a longitudinal oval opening 60 formed therein for receiving the pivot pin 74.
- a pivot block 62 is slidably retained within the retainer portion 58.
- the sliding pivot block 62 includes a bore 64 extending transversely therethrough and aligned with the oval opening 60 for receiving the pivot pin 74.
- the pivot pin 74 must be allowed to move with the pivot block 62 to adjust the effective length of the adjustable link 52. Therefore, the opening 60 is elongated to provide for adjustment of the pivot point extending through the pin 74. Even though the retainer portion 58 does not move back and forth, the effective length of the link 52 is changed as the distance between the two pivot points at pins 74 and 78 can be varied.
- the sliding block 62 is held in position at its end by a bolt 66 threadably connecting therein through corresponding internal threads in the end of the sliding pivot block 62. The bolt 66 extends through an end hole 68 in the retainer portion 58.
- First and second nuts 70 and 72 provide for holding the desired portion of the bolt 66 extending outward from the retainer portion 58.
- a first nut 70 engages the end of the retainer portion 58 while the second nut 72 acts as a lock on the first nut 70 to prevent rotation and further misalignment.
- the sliding block 62 may be adjusted to change the length of the adjustable link 52 and therefore the position of the spacing linkage 50. Adjustment is easily made by loosening the nuts 70 and 72 and inserting or retracting the bolt 66 the desired distance relative to the retainer to obtain the proper position.
- the stage is shown with a slight inward tilt.
- the legs 26 tilt toward one another so that a horizontal stage surface is not achieved.
- the pivot pin 74 is at the extreme far outward end of the opening 60 and the retainer portion 58.
- the adjustable link 52 should be shortened. Therefore, the bolt 66 is loosened and the pivot block 62, and therefor the pin 74 is moved inward to the position shown in Figure 6. At this position, the adjustable link 52 has decreased length and the position of the spacing linkage 50 is brought further upward, thereby moving the stage 20 to better alignment with the legs 26 extending substantially vertically.
- a minor change in the length of the adjustable link 52 changes the overall distance the center pin 78 of the spacing linkage 50 is below the horizontal line extending through the pivot pin 74. This provides a corresponding change in the vertical distance at the center line of the frame 24 and the decks 22. Greater adjustments can be compensated by only minor changes in the length of the adjustable link 52.
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000592511A JP2002534645A (en) | 1999-01-06 | 2000-01-04 | Adjustable link mechanism |
GB0115020A GB2362171B (en) | 1999-01-06 | 2000-01-04 | Adjustable linkage for a folding stage |
AU27189/00A AU2718900A (en) | 1999-01-06 | 2000-01-04 | Adjustable linkage |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/226,365 | 1999-01-06 | ||
US09/226,365 US6164017A (en) | 1999-01-06 | 1999-01-06 | Adjustable linkage |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2000040825A1 true WO2000040825A1 (en) | 2000-07-13 |
WO2000040825B1 WO2000040825B1 (en) | 2000-08-17 |
Family
ID=22848641
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2000/000102 WO2000040825A1 (en) | 1999-01-06 | 2000-01-04 | Adjustable linkage |
Country Status (5)
Country | Link |
---|---|
US (1) | US6164017A (en) |
JP (1) | JP2002534645A (en) |
AU (1) | AU2718900A (en) |
GB (1) | GB2362171B (en) |
WO (1) | WO2000040825A1 (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB0420073D0 (en) * | 2004-09-10 | 2004-10-13 | Michell Andrew | Locking mechanism for use with staging system |
ES2255447B1 (en) * | 2004-12-13 | 2007-08-01 | Sports Enebe, S.L. | FOLDING TABLE. |
JP4616685B2 (en) * | 2005-04-01 | 2011-01-19 | 株式会社 ニード | Step forming device |
US20070007419A1 (en) * | 2005-07-07 | 2007-01-11 | Hulbert Thomas L | Tomcatz stabilizer |
US7775478B2 (en) * | 2006-09-29 | 2010-08-17 | The Boeing Company | Floor beam assembly, system, and associated method |
JP7111748B2 (en) | 2017-06-09 | 2022-08-02 | サイコ インコ-ポレ-テツド | portable stage system |
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-
1999
- 1999-01-06 US US09/226,365 patent/US6164017A/en not_active Expired - Fee Related
-
2000
- 2000-01-04 JP JP2000592511A patent/JP2002534645A/en active Pending
- 2000-01-04 GB GB0115020A patent/GB2362171B/en not_active Expired - Fee Related
- 2000-01-04 WO PCT/US2000/000102 patent/WO2000040825A1/en active Application Filing
- 2000-01-04 AU AU27189/00A patent/AU2718900A/en not_active Abandoned
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4570751A (en) * | 1984-07-12 | 1986-02-18 | Gerhard Kleu | Adjustable platform scaffolding |
US5325640A (en) | 1991-08-09 | 1994-07-05 | Sico Incorporated | Folding stage system |
GB2318273A (en) * | 1996-10-15 | 1998-04-22 | Patrick Mccormick | Tractor linkage siabilizer |
Also Published As
Publication number | Publication date |
---|---|
US6164017A (en) | 2000-12-26 |
JP2002534645A (en) | 2002-10-15 |
GB2362171B (en) | 2003-02-05 |
GB0115020D0 (en) | 2001-08-08 |
AU2718900A (en) | 2000-07-24 |
WO2000040825B1 (en) | 2000-08-17 |
GB2362171A (en) | 2001-11-14 |
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Legal Events
Date | Code | Title | Description |
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