US2973933A - Foldable tripod easel - Google Patents
Foldable tripod easel Download PDFInfo
- Publication number
- US2973933A US2973933A US805543A US80554359A US2973933A US 2973933 A US2973933 A US 2973933A US 805543 A US805543 A US 805543A US 80554359 A US80554359 A US 80554359A US 2973933 A US2973933 A US 2973933A
- Authority
- US
- United States
- Prior art keywords
- legs
- easel
- foldable tripod
- foldable
- arms
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 210000002414 leg Anatomy 0.000 description 28
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 210000001217 buttock Anatomy 0.000 description 1
- POIUWJQBRNEFGX-XAMSXPGMSA-N cathelicidin Chemical compound C([C@@H](C(=O)N[C@@H](CCCNC(N)=N)C(=O)N[C@@H](CCCCN)C(=O)N[C@@H](CO)C(=O)N[C@@H](CCCCN)C(=O)N[C@@H](CCC(O)=O)C(=O)N[C@@H](CCCCN)C(=O)N[C@@H]([C@@H](C)CC)C(=O)NCC(=O)N[C@@H](CCCCN)C(=O)N[C@@H](CCC(O)=O)C(=O)N[C@@H](CC=1C=CC=CC=1)C(=O)N[C@@H](CCCCN)C(=O)N[C@@H](CCCNC(N)=N)C(=O)N[C@@H]([C@@H](C)CC)C(=O)N[C@@H](C(C)C)C(=O)N[C@@H](CCC(N)=O)C(=O)N[C@@H](CCCNC(N)=N)C(=O)N[C@@H]([C@@H](C)CC)C(=O)N[C@@H](CCCCN)C(=O)N[C@@H](CC(O)=O)C(=O)N[C@@H](CC=1C=CC=CC=1)C(=O)N[C@@H](CC(C)C)C(=O)N[C@@H](CCCNC(N)=N)C(=O)N[C@@H](CC(N)=O)C(=O)N[C@@H](CC(C)C)C(=O)N[C@@H](C(C)C)C(=O)N1[C@@H](CCC1)C(=O)N[C@@H](CCCNC(N)=N)C(=O)N[C@@H]([C@@H](C)O)C(=O)N[C@@H](CCC(O)=O)C(=O)N[C@@H](CO)C(O)=O)NC(=O)[C@H](CC=1C=CC=CC=1)NC(=O)[C@H](CC(O)=O)NC(=O)CNC(=O)[C@H](CC(C)C)NC(=O)[C@@H](N)CC(C)C)C1=CC=CC=C1 POIUWJQBRNEFGX-XAMSXPGMSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000009877 rendering Methods 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16M—FRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
- F16M11/00—Stands or trestles as supports for apparatus or articles placed thereon ; Stands for scientific apparatus such as gravitational force meters
- F16M11/20—Undercarriages with or without wheels
- F16M11/24—Undercarriages with or without wheels changeable in height or length of legs, also for transport only, e.g. by means of tubes screwed into each other
- F16M11/242—Undercarriages with or without wheels changeable in height or length of legs, also for transport only, e.g. by means of tubes screwed into each other by spreading of the legs
- F16M11/247—Members preventing slipping of the feet
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47B—TABLES; DESKS; OFFICE FURNITURE; CABINETS; DRAWERS; GENERAL DETAILS OF FURNITURE
- A47B3/00—Folding or stowable tables
- A47B3/08—Folding or stowable tables with legs pivoted to top or underframe
- A47B3/0809—Folding or stowable tables with legs pivoted to top or underframe with elastic locking means
- A47B3/0812—Folding or stowable tables with legs pivoted to top or underframe with elastic locking means the resilient force of the elastic locking means acting in a direction parallel to the axis of rotation of the leg
Definitions
- One object of this invention is to provide a foldable tripod easel wherein the supporting legs are pivotally held within a cup-shaped cap of approximately triangular cross-section without the use or need of fasteners, pivot pins or the like, with the result that there are no'loose parts to become aocidentially detached and lost'during transportation or use.
- Another object is to provide a foldable tripod easel of the foregoing character in which the upper ends of the legs are hollow and are yieldably held in the cup-shaped cap by a three-armed spring leg-holder which not only provides a pivotal connection with the cap but also resiliently urges the legs outwardly toward the pockets formed at the inside corners of the cap.
- Another object is to provide a tripod easel of the foregoing character wherein the legs may be quickly and easily pushed toward one another int-o parallelism with one another and their lower ends fastened together by a suitable connector, such as a rubber band, cord, chain, ring or the like, so as to be held in compact form for storage or transport; removal of the connector releasing the legs to fly outward into unfolded positions in response to the urge of the three-armed spring leg holder.
- a suitable connector such as a rubber band, cord, chain, ring or the like
- Another object is to provide a foldable tripod easel of the foregoing character wherein the three-armed spring leg holder has twin-pronged pointed ends which firmly engage the inner wall of the upper end of each leg and hold it firmly against accidental dislodgment while permitting unimpeded and instant folding, yet enabling the legs to be withdrawn from the spring arms by a spiral unscrewing motion with sufficient resistance to prevent unintended displacement or removal.
- Figure 1 is a perspective view of a foldable tripod easel, according to one form of the invention, showing in solid lines the easel in its unfolded position and in dotted lines two of the supporting legs swung into folded parallel engagement with the other leg and secured thereto by a cord or elastic band;
- Figure 2 is an enlarged vertical section taken along the line 22 in Figure 1, with portions of the legs broken away to conserve space;
- Figure 3 is a cross-section taken along the line- 3 -3 in. Figure 1;
- Figure 4 is a top planview of the flat stamped blank from which the three-armed spring leg-holder is made by a subsequent'bending operation;
- Figure 5 is a vertical section, partly in side elevation, through the spring leg holder of Figure 4 after it has been bent into its final but relaxed shape prior to installation in the cap.
- foldable tripod easels have had folding legs, the upper ends of which were inserted in sockets in a base and held there by means of screws or other fasteners.
- the present invention provides a foldable tripod easel which eliminates these defects of prior eases and by having its legs held in a eup shaped cap and urged against internal cor rie'r' pocketsthereof by a three-armed spring" leg lio'ld'ef, elinii' nates thepreviouslydis'ed l fasteners yet permits 1 instant folding and unfolding, as desired.
- the foldable tripod easel of the present invention is especially well adapted for use as a display easel although it is not confined to that particular use.
- Figures 1 and 2 show a foldable tripod easel, generally designated ,10, adapted to be held in a folded condition by a cord, elastic band or other suitable holding member 12 encircling the lower portions of its hollow tubular legs 14.
- the legs 14 are constructed preferably of aluminum or other lightweight metal.
- the upper ends of the hollow tubular legs 14 are inserted in pockets 15 formed inside the rounded corners 17 of a cup-shaped cap 16 of the shape of a frustum of of a hollow triangular pyramid with the rounded corners 17, upper end wall 18 and flared side walls 20.
- a three-leaved spring leg-holder Secured to the inside of the end wall 18, as by a fastener 22, is a three-leaved spring leg-holder, generally designated 24, shown in Figures 4 and 5.
- This spring member 24 has a central base 26 with a hole 28 for the fastener 22 and with tapered spring arms 30 inclined downward and outward at circumferentially-spaced intervals of degrees, and terminating in outwardlybent fishtail ends 32 with sharp double prongs 34.
- the fishtail ends 32 are bent ( Figure 4) so that they are approximately parallel to the base 26 in the relaxed condition of the spring leg-holder 24.
- the legs 14 have rubber 7 tips 38 and two have display supporting pins 40 inserted therein.
- the pins 40 consist of bolts 42 ( Figure 2) passing through tubular spacers 44 and holes 46 into nuts 48.
- the upper ends of the legs 14, which have bores 36 therein, are forced over the fishtail end portions 32 of the arms 30 of the spring leg holder 24 and pushed upward against the lower surface of the top wall 18. Since the side walls 20 of the end cap 16 are inclined at steeper angles to the top wall 18 than the spring arms 30 are inclined to the base 26, the arms 30 are in a tensed condition against the inside of the side walls 20 when they are secured within the cap 18 by the fastener 22. As a consequence, the outward spring of the arms 30 causes the prongs 34 on the fishtail ends 32 to bite into the walls of the tubular legs 14, holding them firmly against direct withdrawal (although they can be withdrawn, with some difliculty, by
- the easel 10 is quickly unfolded for the purpose of displaying placards or the like and after such use is as quickly capable of being folded, as shown in Figure 2, with its legs parallel and held together by the string or elastic band 12.
- a foldable easel comprising a cap structure having a central support and a plurality of radially-disposed circu-inferentially-spaced pockets extending outwardly from said support, a resilient leg holder having a central base connected to said central support and a plurality of resilient leg-holding arms connected to said base, said arms being spaced circumferentially around said base in radial alignment with said pockets .and extending downwardly and outwardly from said base in the relaxed condition of said leg holder, and a plurality of tripod legs having Paitented Mar. 7,19er
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mirrors, Picture Frames, Photograph Stands, And Related Fastening Devices (AREA)
Description
March 7, 1961 D. s. HOWELL FOLDABLE TRIPOD EASEL Filed April 10. 1959 I N V EN TOR.
DAV/06114014221. I BY flM/ffla United States Patent 2,973,933 roLnABLaTmronrAsnL David S. Howell, Royalour, Mi'clit, as'slgn'or to Arlington Aluminum Company, Detroit, Mich, a corporation of Michigan Filed Apr. 10, 1959, Ser. No. 805,543
4 Claims. (Cl. 248-166) This invention relates to easels and, in particular, to foldable easels.
One object of this invention is to provide a foldable tripod easel wherein the supporting legs are pivotally held within a cup-shaped cap of approximately triangular cross-section without the use or need of fasteners, pivot pins or the like, with the result that there are no'loose parts to become aocidentially detached and lost'during transportation or use. I
Another object is to provide a foldable tripod easel of the foregoing character in which the upper ends of the legs are hollow and are yieldably held in the cup-shaped cap by a three-armed spring leg-holder which not only provides a pivotal connection with the cap but also resiliently urges the legs outwardly toward the pockets formed at the inside corners of the cap.
Another object is to provide a tripod easel of the foregoing character wherein the legs may be quickly and easily pushed toward one another int-o parallelism with one another and their lower ends fastened together by a suitable connector, such as a rubber band, cord, chain, ring or the like, so as to be held in compact form for storage or transport; removal of the connector releasing the legs to fly outward into unfolded positions in response to the urge of the three-armed spring leg holder.
Another object is to provide a foldable tripod easel of the foregoing character wherein the three-armed spring leg holder has twin-pronged pointed ends which firmly engage the inner wall of the upper end of each leg and hold it firmly against accidental dislodgment while permitting unimpeded and instant folding, yet enabling the legs to be withdrawn from the spring arms by a spiral unscrewing motion with sufficient resistance to prevent unintended displacement or removal.
Other objects and advantages of the invention will become apparent during the course of the following description of the accompanying drawings, wherein:
Figure 1 is a perspective view of a foldable tripod easel, according to one form of the invention, showing in solid lines the easel in its unfolded position and in dotted lines two of the supporting legs swung into folded parallel engagement with the other leg and secured thereto by a cord or elastic band;
Figure 2 is an enlarged vertical section taken along the line 22 in Figure 1, with portions of the legs broken away to conserve space;
Figure 3 is a cross-section taken along the line- 3 -3 in. Figure 1;
Figure 4 is a top planview of the flat stamped blank from which the three-armed spring leg-holder is made by a subsequent'bending operation; and
Figure 5 is a vertical section, partly in side elevation, through the spring leg holder of Figure 4 after it has been bent into its final but relaxed shape prior to installation in the cap.
Hitherto, foldable tripod easels have had folding legs, the upper ends of which were inserted in sockets in a base and held there by means of screws or other fasteners.
Thesefasteners wereeasily dislodged and lost in transit or subsequent storage or us ther'eby rendering the 3 inoperative until they could be replaced. The present invention provides a foldable tripod easel which eliminates these defects of prior eases and by having its legs held in a eup shaped cap and urged against internal cor rie'r' pocketsthereof by a three-armed spring" leg lio'ld'ef, elinii' nates thepreviouslydis'ed l fasteners yet permits 1 instant folding and unfolding, as desired. The foldable tripod easel of the present invention is especially well adapted for use as a display easel although it is not confined to that particular use.
Referring to the drawings in detail, Figures 1 and 2 show a foldable tripod easel, generally designated ,10, adapted to be held in a folded condition by a cord, elastic band or other suitable holding member 12 encircling the lower portions of its hollow tubular legs 14. The legs 14 are constructed preferably of aluminum or other lightweight metal. The upper ends of the hollow tubular legs 14 are inserted in pockets 15 formed inside the rounded corners 17 of a cup-shaped cap 16 of the shape of a frustum of of a hollow triangular pyramid with the rounded corners 17, upper end wall 18 and flared side walls 20. Secured to the inside of the end wall 18, as by a fastener 22, is a three-leaved spring leg-holder, generally designated 24, shown in Figures 4 and 5. This spring member 24 has a central base 26 with a hole 28 for the fastener 22 and with tapered spring arms 30 inclined downward and outward at circumferentially-spaced intervals of degrees, and terminating in outwardlybent fishtail ends 32 with sharp double prongs 34. The fishtail ends 32 are bent (Figure 4) so that they are approximately parallel to the base 26 in the relaxed condition of the spring leg-holder 24. The legs 14 have rubber 7 tips 38 and two have display supporting pins 40 inserted therein. The pins 40 consist of bolts 42 (Figure 2) passing through tubular spacers 44 and holes 46 into nuts 48.
In assembling the device,'the upper ends of the legs 14, which have bores 36 therein, are forced over the fishtail end portions 32 of the arms 30 of the spring leg holder 24 and pushed upward against the lower surface of the top wall 18. Since the side walls 20 of the end cap 16 are inclined at steeper angles to the top wall 18 than the spring arms 30 are inclined to the base 26, the arms 30 are in a tensed condition against the inside of the side walls 20 when they are secured within the cap 18 by the fastener 22. As a consequence, the outward spring of the arms 30 causes the prongs 34 on the fishtail ends 32 to bite into the walls of the tubular legs 14, holding them firmly against direct withdrawal (although they can be withdrawn, with some difliculty, by
a spiral unscrewing motion).
The easel 10 is quickly unfolded for the purpose of displaying placards or the like and after such use is as quickly capable of being folded, as shown in Figure 2, with its legs parallel and held together by the string or elastic band 12.
What I claim is:
1. A foldable easel comprising a cap structure having a central support and a plurality of radially-disposed circu-inferentially-spaced pockets extending outwardly from said support, a resilient leg holder having a central base connected to said central support and a plurality of resilient leg-holding arms connected to said base, said arms being spaced circumferentially around said base in radial alignment with said pockets .and extending downwardly and outwardly from said base in the relaxed condition of said leg holder, and a plurality of tripod legs having Paitented Mar. 7,19er
4 of said arms has a plurality of pointed elements thereon grippingly engaging the internal upper end portions of said legs.
References Cited in the file of this patent UNITED STATES PATENTS 312,363 Lewis Feb. 17, 1885 2,488,849 Churchill Nov. 22, 1949 FOREIGN PATENTS 156,823 Sweden Nov. 6, 1956
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US805543A US2973933A (en) | 1959-04-10 | 1959-04-10 | Foldable tripod easel |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US805543A US2973933A (en) | 1959-04-10 | 1959-04-10 | Foldable tripod easel |
Publications (1)
Publication Number | Publication Date |
---|---|
US2973933A true US2973933A (en) | 1961-03-07 |
Family
ID=25191865
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US805543A Expired - Lifetime US2973933A (en) | 1959-04-10 | 1959-04-10 | Foldable tripod easel |
Country Status (1)
Country | Link |
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US (1) | US2973933A (en) |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3177925A (en) * | 1962-06-13 | 1965-04-13 | Miller Marcus | Portable and adjustable fence for manholes, openings and the like |
US3705703A (en) * | 1969-04-28 | 1972-12-12 | Curt Niggeloh | Stand with carrying device |
US4036465A (en) * | 1976-02-09 | 1977-07-19 | Kellner Sam J | Adjustable stand |
US5497971A (en) * | 1994-06-06 | 1996-03-12 | Spiro; Alexander C. | Trigonal pyramidal bookstand |
USD424308S (en) * | 1999-03-12 | 2000-05-09 | Ghent Manufacturing, Inc. | Collapsible easel |
US6092770A (en) * | 1997-10-09 | 2000-07-25 | Lino Manfrotto & Co., S.P.A. | Stand for photographic-optical and cinematographic equipment |
US6179266B1 (en) | 1999-07-22 | 2001-01-30 | Ghent Manufacturing, Inc. | Collapsible easel |
US6202974B1 (en) * | 1998-03-30 | 2001-03-20 | General Binding Corporation, Quartet Mfg. Co. Divison | Portable easel with adjustable board support |
US20060192071A1 (en) * | 2005-02-28 | 2006-08-31 | Choi Hyoung K | Angle adjustable easel |
US20130048804A1 (en) * | 2011-08-29 | 2013-02-28 | Hoshino Gakki Co., Ltd. | Stand for musical instrument |
USD766879S1 (en) * | 2014-12-30 | 2016-09-20 | Samsung Electronics Co., Ltd. | Stand for speaker |
USD1005077S1 (en) * | 2023-05-25 | 2023-11-21 | Shaojie Ni | Clamping device |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US312363A (en) * | 1885-02-17 | Petefia | ||
US2488849A (en) * | 1947-03-25 | 1949-11-22 | United Carr Fastener Corp | Furniture glider |
-
1959
- 1959-04-10 US US805543A patent/US2973933A/en not_active Expired - Lifetime
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US312363A (en) * | 1885-02-17 | Petefia | ||
US2488849A (en) * | 1947-03-25 | 1949-11-22 | United Carr Fastener Corp | Furniture glider |
Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3177925A (en) * | 1962-06-13 | 1965-04-13 | Miller Marcus | Portable and adjustable fence for manholes, openings and the like |
US3705703A (en) * | 1969-04-28 | 1972-12-12 | Curt Niggeloh | Stand with carrying device |
US4036465A (en) * | 1976-02-09 | 1977-07-19 | Kellner Sam J | Adjustable stand |
US5497971A (en) * | 1994-06-06 | 1996-03-12 | Spiro; Alexander C. | Trigonal pyramidal bookstand |
US6092770A (en) * | 1997-10-09 | 2000-07-25 | Lino Manfrotto & Co., S.P.A. | Stand for photographic-optical and cinematographic equipment |
US6202974B1 (en) * | 1998-03-30 | 2001-03-20 | General Binding Corporation, Quartet Mfg. Co. Divison | Portable easel with adjustable board support |
USD424308S (en) * | 1999-03-12 | 2000-05-09 | Ghent Manufacturing, Inc. | Collapsible easel |
US6179266B1 (en) | 1999-07-22 | 2001-01-30 | Ghent Manufacturing, Inc. | Collapsible easel |
US20060192071A1 (en) * | 2005-02-28 | 2006-08-31 | Choi Hyoung K | Angle adjustable easel |
US20130048804A1 (en) * | 2011-08-29 | 2013-02-28 | Hoshino Gakki Co., Ltd. | Stand for musical instrument |
US8967585B2 (en) * | 2011-08-29 | 2015-03-03 | Hoshino Gakki Co., Ltd. | Stand for musical instrument |
USD766879S1 (en) * | 2014-12-30 | 2016-09-20 | Samsung Electronics Co., Ltd. | Stand for speaker |
USD1005077S1 (en) * | 2023-05-25 | 2023-11-21 | Shaojie Ni | Clamping device |
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