Patent Publication Number: US-RE47426-E

Title: 360 degree rotational easel

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application claims the benefit of provisional patent application Ser. No. 61/851,140 filed Mar. 4, 2013, and Ser. No. 61/959,686 filed Aug. 30, 2013 by the present inventor. 
     BACKGROUND 
     1. Field 
     This application relates to easels, specifically rotating artist easels and display easels. 
     2. Background of the Invention 
     Most every visual artist and presenter requires an easel to display and secure their articles. Many easel designs have been devised to facilitate the needs of the user for functionality, and ease of use. 
     Recently, the creation of art has increasingly focused more on the artist, their insights, forms of expression, their understanding, and an effective use of media—so less distraction for the artist makes for a more pleasurable painting experience. This ease of use is also true of presenters that use an easel, and who would like or need to rotate their presentation for whatever reason, and would also prefer an uninterrupted flow in their presentation and free from distractions. The presenter and artist now prefer to focus on the subject at hand, rather than on the object. 
     Originally, the simple standard easel employed three legs, was attached at the top, and offered a bar across the front to rest the article on. Other easels, used horizontal rests that slide on a single vertical bar (or bars) to adjust the height. Some easels even offered rotational capabilities. However, a simple and inexpensive easel that grips the article securely, rotates the article 360 degrees in either direction, and can convert the standard easel and camera tripod into a rotating easel has been elusive. I found much prior art in easels, however all have fallen short in being able to deliver all the attributes and endowments my embodiment offers. 
     US Patent—“Easel” US392639181 1A1 1 to Melvin C. Vincent (1975) claims a rotational feature, but does not explicitly claim 360 degrees of rotation in either direction. The rotating mechanism is different from my embodiment, and so are the clamping features. US Patent—“Rotatable Easel” U.S. Pat. No. 6,712,328 B1 to Richard Joseph Morton (2004) also claims a rotational feature of “at least” 90 degrees, but not explicitly 360 degrees. Again the apparatus to rotate the canvas is different, and so is the securing mechanism. US Patent “Easel, especially for canvas frames (stretchers), for use in painting” U.S. Pat. No. 6,390,433 B1 to Vladimir Kasa-Djukic (2002) claims 360 degrees of rotation but also by a different means than my embodiment, and also employs a different clamping mechanism than my embodiment. US Patent “Paint easel and display rack assembly” U.S. Pat. No. 6,698,705 B2 (2004) to Toghanian Jahanbakhsh claims adjustable angles and rotational qualities but not specifically 360 degrees. This embodiment is again different from my embodiment in the angles of rotation, the method for changing the angle of the composition, and the securing mechanism. US Patent “Multi-position presentation easel” U.S. Pat. No. 6,889,952 B2 (2005) to Ronald D. Cook &amp; Pamela J. Emken claims rotational features. Again the apparatus to rotate the canvas is different, and so is the securing mechanism. US Patent U.S. Pat. No. 4,109,892 “Adjustable easel” (1977) to John P. Hartung claims 360 degree rotation and a tilting feature. Here again, the rotating mechanism is different from my embodiment, and so are the clamping and tilting features. US Patent “Adjustable easel for supporting a work piece” 2008-06-03 (U.S. Pat. No. 7,380,765) to Harold H. Schiff claims rotational and tilting features and is on the market as the “Windmill Easel”. However, this embodiment has a different rotating mechanism than my embodiment, and also has a dissimilar clamping mechanism. The “Windmill Easel” and my device are dissimilar in design and engineering, with the “Windmill Easel” being much more complicated, costlier to manufacture, and this is reflected in a price of ten times more to the consumer. Considering that most artists have a small budget to work with, the “Windmill Easel,” is more of a luxury item for established artists than an economical way of providing these tilting and rotational features to mainstream artists. The “Windmill Easel” is not an inexpensive conversion kit to modify many standard easel stands and camera tripods into a rotatable easel. Nor is my embodiment “in the spirit” of the “Windmill Easel”. 
     None of the prior art that I could find solved all the technical and practical problems of cost and versatility that my embodiments have resolved. After untangling the problems I encountered in the design and building of the prototypes, the prior art I then found employed rotational features more complicated and costly than my design, and the prior art wasn&#39;t specifically designed as a conversion kit. 
     SUMMARY OF THE INVENTION 
     The idea of this embodiment is to provide an effective and inexpensive solution and means to convert most existing standard easels and/or camera tripods into a 360 degree rotational easel and resolve the cost concerns of many artists for this rotational feature. This conversion feature and the simplicity in design now allow most cost conscious artists the ability to afford and enjoy the use of a rotational easel. 
     The advantages of these embodiments are that the rotational device is simple, easy and cheap to manufacture and repair, and can be constructed with a wide choice of materials, and readily available parts. Another advantage of a rotating easel is that this added rotational capacity now allows for painting in otherwise awkward angles, and adds the easel&#39;s ability of the easel to easily rotate the canvas to check the composition all the while without interruption, and the dirtying of the hands, or the composition. There is also an advantage of portability in this embodiment because of its light-weight design. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIGS. 1A to 1F  illustrate components of a basic easel stand. 
         FIGS. 2A to 2G  illustrate a detachable clamping bar embodiment clamped onto the standard easel, and a rotational arm assembly in one and two arm models. 
         FIGS. 3A to 3D  illustrate a clamp-on tripod embodiment in the one and two arm models. 
         FIGS. 4A to 4K  illustrate the rotational arm and a sliding bar clamp assembly. 
         FIG. 5  illustrates a canvas mounted on an easel stand using a clamping bar assembly. 
         FIGS. 6A-B  illustrates the conversion of an existing easel with a center arm brace (as an example) using the clamping bar assembly. 
         FIG. 7  illustrates the use of a clamp-on tripod assembly with an existing camera tripod. 
         FIG. 8  illustrates a sketch of the portable tabletop easel stand with a package of hardware, a set of instructions, and a box for packaging. 
         FIG. 9  illustrates a sketch of the rotating arm assembly, and the sliding bar clamps with a set of attached L-Grips. 
         FIG. 10  a sketch of the clamping bar assembly. 
         FIG. 11  a sketch that illustrates the camera tripod adapter assembly. 
         FIGS. 12A and 12B  are front and rear sketches illustrating the use of the L-Grips gripping a canvas stretcher from behind. 
         FIG. 13  is a sketch illustrating the coupling of the rotational assembly with the clamping bar assembly. 
         FIG. 14  is a sketch illustrating the coupling of the rotational assembly with the camera tripod assembly. 
         FIG. 15  is a zoom in sketch illustrating the coupling of the rotational assembly with the camera tripod assembly 
         FIG. 16  is a sketch illustrating the coupling of the rotating assembly with a modified easel at various stages in its transformation. 
     
    
    
     
       
         
           
               
             
               
                   
               
               
                 DRAWINGS - Reference Numerals 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
            
               
                   
                 20 - Rotational Arm 
               
               
                   
                 22 - Sliding Bar Clamp Assembly 
               
               
                   
                 23 - Circular Brace Plate (large) 
               
               
                   
                 24 - Circular Front Brace Plate (small) 
               
               
                   
                 26 - Circular Rear Brace Plate (small) 
               
               
                   
                 28 - Felt Pads 
               
               
                   
                 30 - Backing Plate 
               
               
                   
                 32 - Screw 
               
               
                   
                 34 - Carriage Bolt 
               
               
                   
                 36 - PVC40 Cap Slip 
               
               
                   
                 38 - Flat Washer (large) 
               
               
                   
                 39 - Flat Washer (small) 
               
               
                   
                 40 - Wing Nut (large) 
               
               
                   
                 41 - Wing Nut (small) 
               
               
                   
                 42 - PVC40 Pipe Side Leg 
               
               
                   
                 44 - PVC40 Pipe Center Leg 
               
               
                   
                 46 - Hex Bolt (large) 
               
               
                   
                 47 - Hex Bolt (small) 
               
               
                   
                 48 - Insert Nut (large) 
               
               
                   
                 49 - Insert Nut (small) 
               
               
                   
                 50 - Thumb Screw 
               
               
                   
                 52 - Bent Flat Bar L - Grip 
               
               
                   
                 54 - Vinyl Cap 
               
               
                   
                 56 - Nylon Lock Nut 
               
               
                   
                 58 - Lock Nut Washer (large) 
               
               
                   
                 59 - Lock Nut Washer (small) 
               
               
                   
                 60 - Front Clamping Bar 
               
               
                   
                 62 - Rear Clamping Bar 
               
               
                   
                 64 - Nails 
               
               
                   
                 66 - Glue 
               
               
                   
                 68 - Wing Screw 
               
               
                   
                 70 - Female Tripod Mount 
               
               
                   
                 72 - Male Tripod Adapter 
               
               
                   
                 74 - Drill Hole 
               
               
                   
                 76 - Bored Out Hole 
               
               
                   
                 78 - Rear Bar Clamp Guide &amp; Brace 
               
               
                   
                 80 - Front Facing Bar 
               
               
                   
                 62 - Center Arm 
               
               
                   
                 84 - Rest Bar 
               
               
                   
               
            
           
         
       
     
     DRAWINGS 
     Parts List—Detailed Description 
     
         
           20 —Rotational Arm—used as a component to secure, brace, and rotate the work piece. 
           21 —Rotational Arm Assembly—consists of the rotational arm ( 20 ), front brace plate ( 24 ), felt pads ( 28 ) and the following parts ( 38 ,  40 ,  46 ,  58 ,  64 ,  66 ). 
           22 —Sliding Bar Clamp Assembly—used to secure the work piece on the rotational arm ( 20 ). Comprised of parts ( 48 ,  49 ,  50 ,  52 ,  66 ,  68 ,  78 ,  80 ). 
           24 —Circular Front Brace Plate—attached to the rotational arm(s) ( 20 ), with a set of attached felt pads ( 28 ) to slide against a circular rear brace plate ( 26 ). 
           26 —Circular Rear Brace Plate—attached to the rear clamping bar ( 62 ), or the male tripod adapter ( 72 ), and provides the surface for the front brace plate ( 24 ) with the felt pads ( 28 ) to slide on. 
           28 —Felt Pads—used as a cushion to help facilitatec the slide-ability and frictional function between the two circular brace plates ( 24 ,  26 ). 
           30 —Standard nut—to secure the rest bar. 
           32 —Machine Screw—used to secure the rest bar ( 84 ) to the easel side legs ( 42 ). 
           34 —Carriage Bolt—used at the top of the legs ( 42 ,  44 ) to secure and hold the three legs together. 
           36 —PVC 40  Cap Slip—used to top the center leg ( 44 ). 
           38 —Flat Washer (large)—used as a spacer for the nuts to slide on. 
           39 —Flat Washer (small)—used as a spacer for the nuts to slide on. 
           40 —Nylon Locking Wing Nut (large)—used to tighten the rotational arm assembly ( 21 ) to the clamping bars ( 60 ,  62 ) with the large flat washer ( 38 ) and center hex bolt ( 46 ). 
           41 —Wing Nut (small)—used in the clamping bar assembly to tighten in the back the side hex bolts ( 47 ) entering through the clamping bars ( 60 ,  62 ), along with the small flat washers ( 39 ), lock nut washers ( 59 ); and also to tighten the carriage bolt ( 34 ) with the washer ( 39 ) at the top of the legs ( 42 ,  44 ). 
           42 —PVC 40  Pipe Side Leg—used for side legs of the easel stand and angled at one end. 
           44 —PVC 40  Pipe Center Leg—used for the center leg of the easel stand. 
           46 —Hex Bolt (large)—used to pivotally attach the rotational assembly ( 21 ) to the clamping bars ( 60 ,  62 ) with the easel legs ( 42 ) sandwiched between, and through the rear brace plate ( 26 ); and also to attach the rotational assembly ( 21 ) to the tripod adapter ( 72 ). 
           47 —Hex Bolt (small)—for the clamping bar embodiment to hold the front ( 60 ) and rear clamping bars ( 62 ) together. 
           48 —Insert Nut (large)—used in the sliding bar clamp assemblies ( 22 ) to enable the thumb screws ( 50 ) to tighten the sliding bar clamps to the rotational arm ( 20 ). 
           49 —Insert Nut (small)—used in the sliding bar assemblies ( 22 ) to allow the wing screw ( 68 ) to tighten the L-grips ( 52 ) onto the rear of the sliding bar clamp ( 22 ). 
           50 —Thumb Screw—passes through the insert nut ( 48 ) and is used to tighten the sliding bar clamp assembly ( 22 ) to the rotational arm ( 20 ). 
           52 —Bent Flat Bar L-Grip—optional equipment used to pull and secure a canvas stretcher from behind, and/or to provide additional work piece support. 
           54 —Vinyl Cap—used on the easel legs to provide a gripping function so the easel stand does not slip on the resting surface. 
           56 —Nylon Lock Nut—used in the tripod adapter embodiment to secure the rotational arm assembly ( 21 ) to the tripod adapter ( 72 ) with the hex bolt ( 46 ) and flat washer ( 38 ). 
           58 —Lock Nut Washer (large)—optional. 
           59 —Lock Nut Washer (small)—optional. 
           60 —Front Clamping Bar—used to sandwich the front of the easel legs ( 42 ), or center arm brace ( 82 ), to the rear clamping bar ( 62 ), and is also secured to the rear of the front brace plate. 
           62 —Rear Clamping Bar—used to sandwich the back of the easel legs ( 42 ), or the center arm brace ( 82 ), to the front clamping bar ( 60 ). 
           63 —Clamping Bar Assembly—front and rear clamping bars ( 60 ,  62 ), rear brace plate ( 26 ), and hardware ( 39 ,  41 ,  47 ,  59 ,  64 ,  66 ). 
           64 —Nails—used to secure the rotational arm ( 20 ) to the front brace plate ( 24 ); the rear brace plate ( 26 ) to the front clamping bar ( 60 ); and the male tripod adaptor ( 72 ) to the rear brace plate ( 26 ). 
           66 —Glue—also used to secure the plates ( 24 ,  26 ) to the clamping bar ( 60 ), the rotational arm ( 20 ), and the male tripod adaptor ( 72 ). 
           68 —Wing Screw—used to secure the L-grips to the rear of the front facing bar ( 80 ) of the sliding bar assembly ( 22 ) through the small insert nut ( 49 ). 
           70 —Female Tripod Mount—mount found on the camera tripod. 
           72 —Male Tripod Adapter—adapter built to clamp into the camera tripod female mount. 
           73 —Tripod Adapter Assembly—consists of the adapter ( 72 ) and rear brace plate ( 26 ) and uses parts ( 38 ,  46 ,  56 ,  64 ,  66 ). 
           74 —Drill Hole—used for bolts to pass through. 
           76 —Bored Out Hole—used to recess the heads of the hex bolts ( 46 ,  47 ) and nylon lock nut ( 56 ). 
           78 —Rear Bar Clamp Guide &amp; Brace—part of the sliding bar assembly glued on to the front facing bar ( 80 ). Cut at an angle complementary to the rotating arm and about ⅜″ in height more than the front bar ( 80 ) to provide a lip to better brace the canvas, and together with the face bar ( 80 ) allows for the slide-ability up and down the rotational bar ( 20 ). 
           80 —Front Facing Bar—front part of the sliding bar assembly ( 22 ) which incorporates the insert nuts ( 48 ,  49 ). 
           82 —Center Arm Brace—alternative easel brace found on some easels to be adapted by the clamping bar assembly. 
           84 —Rest Bar—to stabilize the easel, and for the work piece to rest on as a display, or regular easel. 
           86 —Hardware package—consists of hardware packages for the assemblies. 
           88 —Instructions—instructions for assembly, use, and care of the product, a list of parts, and templates and instructions to modify existing easels. 
           90 —Packaging—package for rotational assembly ( 21 ), sliding bar clamp assembly ( 22 ), clamping bar assembly ( 63 ), tripod adapter assembly ( 73 ), hardware package ( 86 ), and instructions ( 88 ). 
       
    
     
       
         
           
               
             
               
                   
               
               
                 NESSARY BUILDING TOOLS 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
            
               
                   
                  1. Hammer 
               
               
                   
                  2. Screwdriver 
               
               
                   
                  3. Staple gun 
               
               
                   
                  4. Drill 
               
               
                   
                  5. Table Saw 
               
               
                   
                  6. Scroll saw 
               
               
                   
                  7. Orbital sander 
               
               
                   
                  8. Disk Sander 
               
               
                   
                  9. Sabre saw 
               
               
                   
                 10. Drill bits 
               
               
                   
               
            
           
         
       
     
     DETAILED DESCRIPTION OF THE INVENTION 
     The advantages of these embodiments are that the rotational device is simple, easy, and cheap to manufacture with a wide choice of materials to select from. These embodiments are versatile in scope, offering the owner the capacity to transform existing easels and camera tripods into a rotatable easel cheaply and effectively. The advantage of a rotating easel is that this added rotational capacity now allows for painting in otherwise awkward angles, and adds the ability to easily rotate the canvas to check the composition all the while without interruption, and the dirtying of the of the hands, or the composition. The simplicity of design and reduced cost enables virtually any artist or presenter to afford this rotational easel. 
     The challenge I faced was to create an easel that most every artist or presenter could afford, is durable, versatile, offered few moving parts, is easy to maintain and use, easy to manufacture, and offered this rotational feature. Prior art offered some of these qualities, but not all. Simplifying the rotational device and sliding bar clamps, along with allowing this rotational capability to be easily applied to existing easels and camera tripods as an economical alternative for converting pre-existing easels and camera tripods was the focus of my efforts. 
     This conversion kit includes a standard display easel, a rotational assembly, a set (or two) of sliding bar clamps, a clamping bar assembly, a camera tripod adapter assembly, hardware, and instructions. The rotational assembly is secured with hardware to an existing easel with clamping bars, or onto a camera tripod with a tripod adapter and hardware, and the work piece is secured by means of the sliding bar clamp assembly sliding on the rotational arm ( FIGS. 5 . &amp;  7 ). L-grips allow a canvas stretcher to be pulled up from behind to allow for unobstructed access to all four edges of the canvas ( FIG. 12 ). 
     First Embodiment 
     FIG.  1 A-FIG.  11 —Conversion Kit 
     This conversion kit consists of a standard portable tabletop easel, a rotational assembly ( 21 ), a sliding bar clamp assembly ( 22 ), a clamping assembly ( 63 ), a tripod adapter assembly ( 73 ), a package of the necessary hardware ( 86 ), a set of instructions ( 88 ), and packaging ( 90 ). See  FIGS. 8, 9, 10 &amp; 11 . 
     Operation First Embodiment 
     FIG.  1 A-FIG.  11 —Conversion Kit 
     The owner uses the included instructions to assemble the given embodiments, follows the directions on the use and care of the product, and learns how to adapt convertible pre-existing easel stands, and camera tripods. The rotational assembly ( 21 ) attaches to either the clamping bar assembly ( 63 ) and then onto the easel stand, or onto an adapted easel. (See  FIG. 16 .) Or, the rotational assembly ( 21 ) can attach to the included camera tripod adapter assembly ( 73 ) and then onto the female mount ( 70 ) of a compatible camera tripod (See  FIG. 7 ). 
     Second Embodiment 
     FIGS.  1 A- 1 F—Easel Stand 
     The detachable clamping bar assembly ( 63 ) utilizes the included standard easel stand found in  FIGS. 1A-1F . The side legs ( 42 ) and a center leg ( 44 ) are here made of 1″ PVC  40  pipe. The legs ( 42 ,  44 ) could be made out of any sturdy material such as wood, metal, plastic, etc. . . . . Vinyl caps ( 54 ) in  FIG. 1C  are placed on the bottom of the legs. The tops of the two side legs ( 42 ) are cut at an angle with a hole drilled through ( FIGS. 1A, 1B ). The center leg ( 44 ) has a PVC 40  Cap Slip ( 36 ) placed on the top with a hole drilled through both the cap and center leg.  FIGS. 1A &amp; 1E  illustrate that a carriage bolt ( 34 ) is then pushed through the holes of the side and center legs ( 42 ,  44 ) and secured at the other end by a small regular flat washer ( 39 ) and a wing nut ( 41 ). 
     A rest ( 84 ) should be attached to the side legs ( 42 ) as shown in  FIGS. 1E &amp; 1F  to stabilize the easel stand. The easel stand ( FIG. 1E ) is used with the clamping bar assembly and can also double as a standalone display and/or standard work easel: 
     Operation Second Embodiment 
     FIGS.  1 A- 1 F—Easel Stand 
     The tension applied by the wing nut ( 41 ) determines how easily the center leg will slide between the two side legs ( 42 ). Adjusting the position of the center leg determines the angle of the work piece in relation to the table surface. The vinyl caps shown in  FIGS. 1A-1C  are used so the easel will not easily slide on the surface onto which the easel stand rests. The rest bar stabilizes the easel stand, and also allows the stand to double as a display easel or to be used as a standard easel without rotational features. 
     Third Embodiment 
     FIGS.  2 A- 2 G,  3 A- 3 C,  4 A,  4 J- 4 K,  5 ,  6 B,  7 ,  9  &amp;  13 - 16 —Rotational Assembly 
     The third embodiment is a rotational assembly ( FIGS. 2C-2G, 4A and 9 ). This embodiment also can be made in a one or two rotational arm ( 20 ) version ( FIGS. 2A &amp; 2B ). This embodiment comprises one or two rotational arms ( 20 ), a circular front brace plate ( 24 ), a set of felt pads ( 28 ), a hex bolt ( 46 ), a flat washer ( 38 ), a lock nut washer ( 58 ) (optional), and a locking wing nut ( 40 ) as illustrated in  FIG. 2C . The center hex nut ( 46 ) found in  FIGS. 2A-2D  enters and rests securely in a bored ( 76 ) and drilled out hole ( 74 ) perpendicular through the center of the rotational arm ( 20 ), front brace plate ( 24 ), and attached to a flat washer ( 38 ), a lock nut washer ( 58 ) (optional), and nylon locking wing nut ( 40 ). The adhesive side of the felt pads ( 28 ) attach onto the back of the front brace plate ( 24 ) to provide slide-ability, and friction. 
       FIGS. 2C-2E  illustrates how the small front circular brace plate ( 24 ) is attached to the rotational arm ( 20 ) by nails ( 64 ) and glue ( 66 ) in the one arm model. In the two arm model, the front brace plate is also attached by nails ( 64 ) and glue ( 66 ) as illustrated in  FIGS. 2C, 2D, and 2F and 4J . 
     Operation Third Embodiment 
     FIGS.  2 A- 2 G,  3 A- 3 C,  4 A,  4 J- 4 K,  5 ,  6 B,  7  &amp;  9 ,  13 - 16 —Rotational Assembly 
     The rotational assembly can be constructed with one or two rotational arms ( 20 ) and a pair of sliding bar clamps ( 22 ) slidably attached ( FIG. 2A, 9 ). The L-grips ( 52 ) on the sliding bar clamps ( 22 ) are also optional equipment here. The rotating arm assembly ( 21 ) ( FIG. 4A ,  FIG. 9 ) can be attached using a clamping bar assembly ( FIG. 2C ,  FIG. 6B , and  FIG. 10 ) to convert a standard easel; or to convert a camera tripod by using a tripod adapter ( FIGS. 3A-3D, 7&amp;11 ). 
     This embodiment will work with the included easel stand in  FIG. 1A-1F , and also can be used with many other existing easels to convert them into rotating easels. To convert other existing easels, drill additional holes into the center arm brace ( 82 ) using the holes in the front clamping bar as a template, or a template found in the instructions, and use the hardware shown in  FIGS. 2A-2E &amp; 10 . If necessary, the rear clamping bar ( 62 ) can also be secured to the back of the center arm brace ( 82 ). Easels with a center arm brace ( 82 ) ( FIGS. 6A, 6B &amp; 16 ) can be modified by drilling holes large enough for the center and side hex bolts ( 46 ,  47 ) to pass through, and use the center arm brace ( 82 ) of the easel to function as, and replace the rear clamping bar ( 62 ), and then secure the rotational arm assembly ( 21 ) and clamping bar assembly ( 63 ) to the desired tension with flat washers ( 36 ,  38 ), the nylon locking wing nut ( 40 ), and lock nut washers ( 59 ) with wing nuts ( 41 ) to the back of the center arm brace ( 82 ). If necessary, the rear clamping bar ( 62 ) can also be secured to the center arm brace ( 82 ). The rotational arm assembly ( 21 ) attaches to either the clamping bar assembly ( 63 ) ( FIG. 13 ) or the tripod adapter assembly ( 73 ) ( FIGS. 14 &amp; 15 ). The sliding bar clamps ( 22 ) slide, and secure themselves onto the rotational assembly to secure the work piece. Once secured, the work piece can then be rotated 360 degrees in either direction by swinging the rotational arm ( 20 ). The work piece is secured onto the rotational arm by the pressure of the sliding bar clamps ( 22 ) against the work piece ( FIG. 5 ). 
     Fourth Embodiment 
     FIGS.  2 A- 2 B,  3 A- 3 B,  4 A- 4 H,  5 ,  7 ,  9  &amp;  12 —Sliding Bar Clamps and L-Grips 
       FIGS. 4A-4H &amp; 9  illustrates in more detail how the sliding bar clamp assembly ( 22 ) is made and operates.  FIG. 4A  is a side view of the rotating arm assembly ( 21 ) with the sliding bar clamps ( 22 ) slidably attached.  FIG. 4B  shows a detailed top view of the sliding bar clamp ( 22 ) mounted on the rotational arm ( 20 ). The sliding bar clamp ( 22 ) is comprised of two pieces ( FIG. 4C ), the front facing bar ( 80 ) and the rear bar clamp guide and braces ( 78 ) and are glued together with the brace ( 78 ) having a lip overhanging the facing bar ( 80 ) to give more support to the canvas, or work piece. This feature is especially useful in the embodiments that use only one rotational arm ( 20 ) for support. 
       FIGS. 4D-4F &amp; 4H  illustrate the positioning of the bent flat bar L-grips ( 52 ) on the back side of the sliding bar clamp ( 22 ). A wing screw ( 68 ) secures the said L-grips ( 52 ) in place through a small insert nut ( 49 ) screwed into the back side of the front facing bar ( 80 ).  FIG. 4F  illustrates that the L-grip ( 52 ) can be attached in either direction depending on the item being rotated. Whether being used to pull on a canvas stretcher, or acting in reverse as a brace. The rotational arm ( 20 ) is cut at approximately a 60 degree angle with the rear bar clamp guide and brace ( 78 ) complementing this angle so the sliding bar clamps ( 22 ) can slide over and hug the rotational bar ( 20 ). 
       FIG. 4J  shows a side view of how a two arm rotational arm embodiment is mated together. The rotational bars ( 20 ) are perpendicular to each other, and nailed and glued to the circular front brace plate ( 24 ).  FIG. 4K  shows the one rotational arm embodiment ( 20 ) (shown horizontally) being glued and nailed to the circular brace plate ( 24 ). 
     Operation of Fourth Embodiment 
     FIGS.  2 A- 2 B,  3 A- 3 B,  4 A- 4 H,  5 ,  7 ,  9  &amp;  12 —Sliding Bar Clamps and L-Grips 
       FIG. 4B  illustrates how the complementary angles in the sliding bar clamp ( 22 ) and rotational arm ( 20 ) allow the bar clamp ( 22 ) to glide over the arm and secure the canvas onto the easel. The bar clamp ( 22 ) is secured onto the arm ( 20 ) by tightening the thumb screws ( 50 ) through the front insert nut ( 48 ) and into the rotational arm ( 20 ) so that the bar clamp fits snugly on the arm ( 20 ). The article being rotated is sandwiched between the two (or four) sliding bar clamps ( 22 ) and rests on the rotational arms ( 20 ), and the lip of the rear bar clamp guide and brace ( 78 ) and/or reversed L-grips ( 52 ). A bar clamp ( 22 ) with a lip is optional when combined with the L-grips ( 52 ) as the reversed L-grip also provides a bracing function. The snugness of the bar clamps ( 22 ) on the article is determined by the downward pressure on the bar clamp to the article being secured, and not by the tightening of the thumb screws ( 50 ). 
     L-grips ( 52 ) grab the canvas stretcher from behind, and the pulling now determines how snug the canvas is held. Again, tightening the thumb screws ( 50 ) on the bar clamp ( 22 ) only keeps the clamps from sliding on the rotating arm ( 20 ) and keeps the article from sliding out of place.  FIG. 4F  illustrates the L-grip ( 52 ) being secured with a wing screw ( 68 ) into the insert nut ( 49 ), with the L-grip pointing in either direction.  FIG. 9  is a sketch of the L-Grips ( 52 ) on the rotational assembly ( 21 ).  FIG. 12  is a sketch of how the L-Grips pull a canvas stretcher up from behind. 
     Fifth Embodiment 
     FIGS.  2 A- 2 C,  6 B,  10  &amp;  13 —Clamping Bar Assembly 
     The clamping bar assembly ( 63 ) ( FIGS. 2A-2C ,  FIG. 6B , and  FIG. 10 ) is comprised of a front and rear clamping bar ( 60 ,  62 ), a circular rear brace plate ( 26 ), two hex bolts ( 47 ), two flat washers ( 39 ), two lock nut washers ( 59 ), and two wing nuts ( 41 ). The rear of the rear brace plate is attached to the front of the front clamping bar with glue ( 66 ) and nails ( 64 ). A hole is drilled ( 74 ) in the center of the two clamping bars and rear brace plate for the large hex bolt ( 46 ) to pass though. Two holes are bored out ( 76 ) into the front face of the front clamping bar ( 60 ) on both sides of the rear brace plate just enough to securely seat the hex bolts. Two holes are then drilled completely through both the front and rear clamping bar through the already started bored out holes ( FIG. 2C ). 
     Operation Fifth Embodiment 
     FIGS.  2 A- 2 C,  6 B,  10  &amp;  13 —Clamping Bar Assembly 
     The front of the rear brace plate ( 26 ) (attached to the front clamping bar) interfaces with the felt pads on the rear of the front brace plate ( FIGS. 2C-2D ). The easel stand legs ( 42 ) (in  FIGS. 1E, 2A-2C ) are sandwiched by the front and rear clamping bars ( 60 ,  62 ) and are tightened to the legs by use of the hex bolts, washers, and wing nuts. The rotational arm assembly ( 21 ) is attached to the clamping bar assembly ( 63 ) (See  FIG. 13 ) with the hex bolt ( 46 ), washer ( 38 ), lock nut washer ( 58 ) (optional), and nylon locking wing nut ( 40 ). Attach the sliding bar clamps and the apparatus is now ready to use ( FIG. 2A, 2B ). The rotational stiffness is determined by the tightness of the locking wing nut ( 40 ) on the hex bolt ( 46 ). 
     Sixth Embodiment 
     FIGS.  3 C- 3 D, FIGS.  7 ,  11 ,  14  &amp;  15 —Male Clamp-On Camera Tripod Adapter 
       FIGS. 3A-3D, 7, 11, 14 &amp; 15  illustrates a detachable camera tripod mounted easel embodiment. The clamping bar assembly ( 63 ) ( FIGS. 2C, 10 ) is replaced by the camera tripod adapter ( 72 ) in  FIGS. 3C-D  &amp;  11 . Instead of using clamping bars ( 60 ,  62 ) to attach onto a stationary easel stand&#39;s legs ( 42 ), this embodiment has a male tripod adapter ( 72 ) attached onto the back of the circular rear brace plate ( 26 ) themselves attached together with nails ( 64 ) and glue ( 66 ). The adapters can come from the camera tripod maker, or be readily manufactured in any useful material to fit the various tripod types that use a pop-out camera mount.  FIG. 3C  illustrates how the hex bolt ( 46 ) enters through the rotational arm ( 20 ), the brace plates ( 24 ,  26 ), the back of the adapter ( 72 ) ( FIG. 3C ) and is secured by the washer ( 38 ), and nylon lock nut ( 56 ) seated in the recessed bored and drilled out hole ( 76 ,  74 ).  FIG. 3D  is a rear view of the male adapter. The female tripod mount ( 70 ) ( FIG. 3C ) is found on the camera tripod ( FIG. 7 ), and is mated by the male adapter ( 72 ) ( FIG. 3C ) on the camera tripod adapter. 
     Operation Sixth Embodiment 
     FIGS.  3 C- 3 D, FIGS.  7 ,  11 ,  14  &amp;  15 —Male Clamp-On Camera Tripod Adapter 
     Functionally, this clamp-on tripod adapter assembly ( FIGS. 3A, 3B , &amp;  FIG. 7 ) operates similar to the clamping bar embodiment in terms of securing a canvas or article, and rotating it in either direction a full 360 degrees. This embodiment uses a clamp-on male tripod adapter ( 72 ) to interface with an already existing camera tripod&#39;s female mount ( 70 ) turning the camera tripod into an easel with rotational, tilting, and height adjusting capabilities. Better made tripods not only allow height adjustments, but also allow the camera to swivel and tilt 90 to 180 degrees. This allows the operator to tilt a work piece from a near vertical to horizontal position, and also any angle in between. The operator secures the male adapter ( 72 ) into the female tripod mount ( 70 ) as one would do with a camera, and then adjust the tripod and the rotational easel to the desired height and angle. Attach the sliding bar clamps, secure the work piece, and the apparatus is now ready to use ( FIG. 7 ). This embodiment clamps in and out of the tripod for use and transport. This makes for convenience, versatility, and economy of use. 
     Seventh Embodiment 
     FIG.  8 —Package of Necessary Hardware 
     The necessary hardware to construct and operate these embodiments can be easily found at a local hardware store in case they are lost, broken, or minor changes in the parts are necessary (length, etc. . . . ) to modify the owner&#39;s existing specific easel design. The necessary packaged hardware include felt pads ( 28 ), screws ( 32 ), a carriage bolt ( 34 ), a PVC 40  Cap Slip ( 36 ), flat washers ( 38 ,  39 ), wing nuts ( 40 ,  41 ), hex bolts ( 46 ,  47 ), thumb screws ( 50 ), bent flat bar L-Grip ( 52 ), vinyl caps ( 54 ), lock nut washers ( 58 ,  59 ), and wing screws ( 68 ). 
     Operation Seventh Embodiment 
     FIG.  8 —Package of Necessary Hardware 
     The package of hardware comes with instructions to easily assemble the embodiments. 
     Eighth Embodiment 
     FIG.  8 —Instructions 
     The written instructions include diagrams, a listing of parts, assembly directions, instructions for the use and care of the embodiments, templates to modify pre-existing easels, and instructions on overcoming obstacles in converting pre-existing easels. 
     Operation Eighth Embodiment 
     FIG.  8 —Instructions 
     The instructions come in various languages, and are easy to follow. Instructions on the proper use and maintenance of the product, and the assembly of the embodiments are also included. Templates of the clamping bars can be used to line up the holes in the clamping bars to existing easels for drilling that need to be converted, and extra guidance on how to overcome obstacles on easels that need extra modifications for conversion. 
     Construction of the Embodiments 
     The building of this rotational easel is quite simple since there are few moving parts, all of which can be found at local home improvement stores, using a few common tools. 
     The included easel stand found in  FIG. 1A-1F  uses the included clamping bars, and is of standard design. The building of the easel stand requires three pieces of 1″ PVC 40  pipe cut to around 32″. Two of these pieces need to be cut on a long angle on one end to become the side legs ( 42 ) ( FIG. 2A ). Holes should be drilled about ½″ from the top of the angled ends using a ¼″ drill bit. Next, cap ( 36 ) the center leg ( 44 ) and drill a ¼″ hole through both sides about 1″ from the top. Then attach the pieces as shown in  FIGS. 1A &amp; 1C  using a carriage bolt ( 34 ), a small washer ( 39 ), and a small wing nut ( 41 ). Lastly, attach the three vinyl caps ( 54 ) to the bottom of the legs ( 42 ,  44 ) with glue ( 66 ). 
     Cut a piece of 1″33 2″ hardwood about 24″ long for the rotational arm ( 20 ). Bevel the two long edges with about a 60 degree angle on each side, Then cut your rear bar clamp guide and brace ( 78 ) pieces using the same complementary angle as shown in  FIG. 4B-4G . Cut the front facing bars ( 80 ) about 8″ to 10″ in length to make the sliding bar clamp assembly ( 22 ). 
     Bore a hole half way through the center of the rotational arm ( 20 ) large enough for the head of the hex bolt to snugly fit into the recess. Then drill a ⅜″ hole through the center of the bored out center hole in the rotational arm ( 20 ) and front brace plate ( 24 ) for the hex bolt ( 46 ) to pass through. 
     Glue and clamp the rear bar guide ( 78 ) onto the facing bar ( 80 ) and position it so ( FIG. 4B ) on the rotational arm ( 20 ) to ensure it will line up. After dried, drill another hole through the center of the facing bar ( 80 ) for the insert nut ( 48 ) and screw this nut into the facing bar ( 80 ). The thumb screw ( 50 ) screws into the bar clamp assembly ( 22 ) by way of the insert nut. 
     For the one arm or two arm models, common felt pads ( 28 ) with an adhesive back are attached onto the back side of the circular front brace plate ( 24 ). Place the ⅜″ hex bolt ( 46 ) through the hole (see  FIG. 2C ) in the front of the arm ( 20 ), and front brace plate ( 24 ). 
     The clamping bar ( 63 ) and camera tripod adapter assemblies ( 73 ) employ the same rotational arm(s) ( 20 ) and sliding bar clamps ( 22 ). The one and two arm models requires a small circular brace plate ( 24 ) and the arms are attached at right angles to each other on the front brace plate ( 24 ) (see  FIGS. 4J&amp;4K ). The felt pads ( 28 ) are attached with self-adhesive to the back of the small circular front brace plate ( 24 ) which itself is attached to the rotational arm(s) ( 20 ) by nails ( 64 ) and glue ( 66 ). 
     A front and a rear clamping bar ( 60 ,  62 ) are necessary to build the clamping bar assembly ( 63 ). Cut them both approximately 16″ long for the easel. Center, and attach the rear brace plate ( 26 ) to the front of the front clamping bar ( 60 ) with glue ( 66 ) and nails ( 64 ). See  FIGS. 2C, 2G , &amp; 10 . Bore ( 76 ) two more holes to snugly recess the head of the ¼″ hex bolt ( 47 ) into the front clamping bar ( 60 ) as shown in  FIG. 2C . Drill ⅜″ holes in the center of the clamping bars ( 60 ,  62 ) for the hex bolt ( 46 ) to travel through. Then drill two ¼″ holes through the two clamping bars ( 60 ,  62 ) as shown in  FIG. 2C . Attach the hardware, then clamp onto the easel with the legs ( 42 ) sandwiched between the front and rear clamping bars ( 60 ,  62 ). It&#39;s possible to adapt a one center arm brace ( 82 ) easel (see  FIGS. 6A&amp;6B ) by drilling holes into the easel arm brace ( 82 ) to attach the rotating assembly ( 21 ) with the center arm brace ( 82 ) now sandwiched between the clamping bars ( 60 ,  62 ). The two side hex bolts ( 47 ) are used to clamp the clamping bars ( 60 ,  62 ) to the center arm brace ( 82 ) of the pre-existing easel. The center hex bolt ( 46 ) is used to pivotally attach the rotating arm assembly ( 21 ) to the clamping bars ( 60 ,  62 ) with the hex bolt ( 46 ), washer ( 38 ), and locking wing nut ( 40 ) (See  FIG. 15 ). Other easels whose legs or bars will accommodate this clamping bar embodiment can also be modified with this detachable embodiment, and in some situations the rear clamping bar ( 62 ) may not be needed (See  FIG. 16 ). 
     The clamp-on camera tripod and clamping bar embodiments use the identical rotational assembly ( 21 ). Now, instead, the circular rear brace plate ( 26 ) has a camera tripod adapter or a modified factory camera mount attached with glue ( 66 ) and nails ( 64 ) on its back side (see  FIGS. 3C, 3D ). The tripod adapter assembly then mounts on the camera tripod as the camera normally would ( FIG. 7 ). Tension for the rotating arm assembly ( 21 ) is adjusted by compressing the felt pads ( 28 ) with the nylon lock nut ( 56 ), and hex bolt ( 46 ). 
     The sliding bar clamps ( 4 A- 4 H) can be made with a simple design ( FIGS. 4C, 4G ) or with L-grips ( 52 ) to pull on the back of a canvas stretcher ( FIG. 4A, 4B, 4D-4F, 4H &amp; 12 ) by installing smaller insert nuts ( 49 ), wing screws ( 68 ), and bent flat iron L-grips ( 52 ) into the rear of the front facing bar ( 80 ) and attached as shown ( FIG. 4F ). 
     CONCLUSION, RAMIFICATION, AND SCOPE 
     The reader will see that the various embodiments of this rotating easel can be used by the operator to securely hold an article in place and to then rotate it 360 degrees in either direction. The clamping bar embodiment is able to clamp onto stationary easel legs and modify an existing easel to provide this rotational function. 
     The clamp-on camera tripod embodiment allows the user to modify a camera tripod to double as a rotating easel through the use of a camera tripod mount adapter. Many visual artists, who paint, also participate in photography, so this conversion option saves space and is economical in that the camera tripod and artist easel are now one unit. 
     The advantage of these embodiments over prior art is its simplicity in design and having few moving parts, it is relatively inexpensive to build, is easily manufactured, rotates a full 360 degrees in either direction, is light weight, sturdy, versatile, and provides the end user with an affordable, dependable, and easily repaired rotating easel. 
     The advantage of this rotational easel feature for a visual artist is that the canvas can now be easily rotated to view the composition. This feature now allows for easy painting in once awkward positions by easily adjusting the canvas angle. The artist doesn&#39;t dirty their hands nor the canvas by having to manually adjust the canvas while wet, and all the while not disrupting the painting process for the artist, or the presenter. 
     Multiple embodiments have been discussed in this application that take into account cost factors and additional capabilities such as using one or two rotational arms, a sliding bar clamp with a lip brace, and/or L-grips. Two rotational arms keep the article more secure but adds to the cost. L-grips allow for a canvas to be pulled up from the back so the artist can paint on all four edges of the canvas without interference from the bar clamps, but also adds to the cost. 
     Other additional features that could be added are a motor and a remote control to allow the rotating function to be controlled from a distance for a more ethereal experience by the artist or a presenter, or whomever can find a useful purpose for this embodiment; or a disabled artist forced to paint by foot and mouth and needs to rotate their canvas. 
     The ramifications of this conversion kit are now an artist or presenter does not have to abandon their old easels in order to have a rotational easel and many existing easels and camera tripods can now be easily and inexpensively modified. In addition, the parts are easily replaceable and available through your local hardware store. Thus, this conversion kit is also a good investment because of its useful advantages and potential life-span. Any presenter could also find use for this product if a rotational feature would be of benefit. 
     As for the scope of these embodiments, the parts could be made of many materials such as wood, metal, plastic, and even by a 3D printer. Variations and improvements in design are also possible. For example, the rotating arm could be square instead of beveled and the sliding bar clamps could be modified accordingly—all without affecting the effectiveness of the conversion features. The L-grips could be designed in several ways to perform the same function. There are several major types of camera mounts. A good deal of these types could be outfitted and included in this kit. 
     These embodiments can be made for any size easel using the same basic design and approach, and in different materials. The simplicity in the design of this rotating feature can easily be extended to larger and stationary models. The camera tripod, adapter, and rotational assembly could be merged into one bundle. And/or, the rotational assembly clamping bar assembly, standard easel, and camera tripod adapter could also be merged into another bundle. Other uses for this conversion and rotating feature could also be found for games, activities, and other purposes.