Abstract:
A trim piece is diclosed that allows from easier placement of trim pieces around corners. An elongated member has a block at an end. The block has an abutment face pointed in a direction to extend around a corner and face down the direction for the next trim piece to be placed. The abutment face may alternatively face in the longitudinal direction of the elongate member, or face in a direction for the next trim piece to be placed on the same surface as the first trim piece.

Description:
FIELD OF THE INVENTION 
     This invention relates to decorative trim pieces for building surface such as walls or ceilings, methods of installing the pieces, and methods of manufacturing the pieces. 
     BACKGROUND OF THE INVENTION 
     Decorative trim is used in several situations, such as used with covings, crowns, or as a cornice (trim at a junction between a ceiling and a wall), as a baseboard, (trim at a junction between a floor and a wall), picture rails, wall panel mouldings, door and window casings, or trims attached to a ceiling. Trim can be attached to adjacent surfaces in a number of ways (typically mechanically fastened and/or glued), and presents a three-dimensional decorative surface to the viewing eye when installed. 
     Previous trims present complications at corners. The appearance of the trim at the corners when installed depends upon several factors including length of the trim&#39;s pattern repeat, the desired length of coverage, and the accuracy of the mitred cuts at the ends of the pieces of trim at the corner. Ideally, the mitred cuts should meet smoothly and with mirrored edges across the entire surfaces of the two adjacent pieces of trim. For many installers, especially non-professional installers such as people doing their own home renovations, preparing, laying out and installing pieces of trim with adequate mitre cuts is a time-consuming and frustrating exercise, which is not always entirely successful. 
     SUMMARY OF THE INVENTION 
     The present invention improves on prior trim pieces by providing a trim piece with unitary blocks that form part of the pattern of the trim itself. Each of these blocks will provide at least two faces at angles to each other, one of which is connected to the rest of the trim piece. While pan of the decorative trim piece, the blocks are distinctive parts of the decorative trim, ideally presenting decorative breaks or highlights of the pattern, 
     In use to cover an inner or outer corner, a trim piece with a block at one end is positioned so that the trim piece is attached to the surface to be covered and the block is positioned so that a face looks down the second surface to be covered by a second trim piece placed to abut the block. In use to turn ninety degrees on the same surface, a decorative trim piece with a block at one end is positioned so that the trim piece is attached to the surface to be covered and the block is positioned so that a face looks down the same surface at a ninety degree angle. A second decorative trim piece is placed to abut the block. 
     In one aspect of the invention, there is provided a unitary decorative trim piece for installation on a building surface such as wall or ceiling, the trim piece comprising an elongate member having a central axis and a block at a first end of the member wherein the block has an end face substantially orthogonal to the axis for receipt thereagainst of the end of another trim piece when the pieces are aligned with each other for installation on a common surface. 
     In a feature of this aspect, the block has an obverse face substantially orthogonal to the end face for receipt thereagainst of the end of another trim piece when the pieces are positioned for installation at an inside corner formed at the juncture of adjacent walls, In another feature of this aspect, the block has a reverse face substantially orthogonal to the end face for receipt thereagainst of the end of another trim piece when the pieces are positioned for installation at an outside corner formed at the juncture of adjacent walls. In yet another feature of this aspect, the block has a lower side face substantially orthogonal to the end face for receipt thereagainst of the end of another trim piece when the pieces are positioned to together form a corner on a common surface. In a still further feature of this aspect, the block has an upper side face substantially orthogonal to the end face for receipt thereagainst of the end of another trim piece when the pieces are positioned to together form a corner on a common surface. In still another feature of this aspect, the block has a reverse face substantially orthogonal to the end face for receipt thereagainst of the end of another trim piece when the pieces are positioned for installation at an outside corner formed at the juncture of adjacent walls. In yet another feature of this aspect, the block has an upper side face substantially orthogonal to the end face for receipt thereagainst of the end of another trim piece when the pieces are positioned to together form a corner on a common surface. 
     In a second aspect of this invention, there is provided a unitary decorative trim piece for installation on a building surface such as a wall or a ceiling, the trim piece comprising: an elongate member having a decorative obverse face, and a central axis; first and second blocks at first and second ends of the member, wherein each of the blocks has an end face substantially orthogonal to the axis for receipt thereagainst of the end of another trim piece when the pieces are aligned with each other for installation on a common wall; the first block has an obverse face substantially orthogonal to the end face for receipt thereagainst of the end of another trim piece when the pieces are positioned for installation at an inside corner formed at the juncture of adjacent walls and has a reverse face substantially orthogonal to the end face for receipt thereagainst of the end of another trim piece when the pieces are positioned for installation at an outside corner formed at the juncture of adjacent walls; and the second block has a lower side face substantially orthogonal to the end face for receipt thereagainst of the end of another trim piece when the pieces are positioned to together form a corner on a common surface and has an upper side face substantially orthogonal to the end face for receipt thereagainst of the end of another trim piece when the pieces are positioned to together form a corner on a common surface. 
     In a feature of this second aspect, the end face, obverse face, and reverse face of the first block are coincident with first, second and third surfaces, respectively, of a first imaginary rectangular parallelepiped and the end face, the lower side face, and the upper side face of the second block are coincident with first, second and third surfaces, respectively, of a second imaginary rectangular parallelepiped. In another feature of this aspect, the end face, obverse face, and reverse face of the first block are coincident with first, second and third surfaces, respectively, of an imaginary rectangular parallelepiped and the end face, the lower side face, and the upper side face of the second block are coincident with first, second and third surfaces, respectively, of the imaginary rectangular parallelepiped. 
     In another aspect of this invention, there is provided a unitary decorative trim piece for installation on a building surface such as a wall or a ceiling, the trim piece comprising: an elongate member having a decorative obverse face; and a block at an end of the elongate member, wherein the block has a face for receipt thereagainst of the end of another trim piece when the pieces are aligned with each other for installation to form a corner on a common wall. 
     In still another aspect of this invention, there is provided a unitary decorative trim piece for installation on a building surface such as a wall or a ceiling, the trim piece comprising an elongate member having a decorative obverse face; and a block at an end of the elongate member, wherein the block has a face for receipt thereagainst of the end of another trim piece when the pieces are positioned with each other for installation at an inside corner. 
     In yet another aspect of this invention, there is provided a unitary decorative trim piece for installation on a building surface such as a wall or a ceiling the trim piece comprising: an elongate member having a decorative obverse face; and a block at an end of the elongate member, wherein the block has a face for receipt thereagainst of the end of another trim piece when the pieces are positioned with each other for installation on an outer corner. 
     In an additional feature of these aspects, the ratio of the length of the elongate member in the direction of the longitudinal axis of the elongate member to the length of the block in the direction of the longitudinal axis of the elongate member is at least 12:1. In another additional feature of these aspects, the ratio of the length of the elongate member in the direction of the longitudinal axis of the elongate member to the length of the block in the direction of the longitudinal axis of the elongate member is at least 20:1. 
     In still another aspect of the invention, there is provided a unitary decorative trim piece for installation on a building surface such as wall or ceiling, the trim piece comprising: an elongate member having a central axis; a first block at a first end of the member; wherein: the first block has an end face substantially orthogonal to the axis for receipt thereagainst of the end of another trim piece when the pieces are aligned with each other for installation on a common surface; the first block has an obverse face substantially orthogonal to the end face for receipt thereagainst of the end of another trim piece when the pieces are positioned for installation at an inside corner formed at the juncture of adjacent walls; and the first block has a reverse face substantially orthogonal to the end face for receipt thereagainst of the end of another trim piece when the pieces are positioned for installation at an outside corner formed at the juncture of adjacent walls. 
     In another feature of this aspect, the trim piece further comprises: a second block at a second end of the member; wherein: the second block has an end face substantially orthogonal to the axis for receipt thereagainst of the end of another trim piece when the pieces are aligned with each other for installation on a common surface; the second block has an upper face substantially orthogonal to the end face for receipt thereagainst of the end of another trim piece when the pieces are positioned to together form a corner on a common surface, and the second block has a lower face substantially orthogonal to the end face for receipt thereagainst of the end of another trim piece when the pieces are positioned to together form a corner on a common surface. 
     In another aspect of the invention, there is provided a commercial package comprising (a) a trim piece and (b) instructions for removing at least one of the blocks thereof so as to provide the elongate member with a free end for abutment with the end face, obverse face or reverse face of the first block, or the end face, the lower side face or the upper side face of the second block, of a second said trim piece. 
     In still another aspect of the invention, there is provided a commercial package comprising (a) a trim piece and (b) instructions for removing at least one of the blocks thereof and removing part of the elongate member with a square cut so as to provide the elongate member with a free end for abutment with the end face, obverse face or reverse face of the first block, or the end face, the lower side face or the upper side face of the second block, of a second said trim piece. 
     In yet another aspect of the invention, there is provided a commercial package comprising (a) a trim piece and (b) instructions for removing at both of the blocks thereof so as to provide the elongate member with a first free end for abutment with the end face, obverse face or reverse face of the first block, or the end face, the lower side face or the upper side face of the second block, of a second said trim piece and a second free end for abutment with the end face, obverse face or reverse face of the first block, or the end face, the lower side face or the upper side face of the second block, of a third said trim piece. 
     In yet another aspect of the invention, there is provided a method of installing trim pieces to form decorative trim on one or more building walls, the method comprising the steps of: 
     (A) installing a said piece in a horizontal position on a first wall with the first block located at an inside corner formed by the juncture of said first wall and a second wall, and as required, any of the following steps (B) to (F): 
     (B) (i) removing the first block from an uninstalled piece so as to provide the elongate member thereof with a free end for abutment against the end face of the second block of another piece; and 
     (ii) installing the uninstalled piece on either the first wall or the second wall in aligned orientation with a previously installed piece and with the free end thereof in abutment with the end face of the second block of the previously installed piece; 
     (C) repeating steps (B)(i) and B(ii); 
     (D) removing the second block from an uninstalled piece so as to provide the elongate member thereof with a free end for abutment against the face of another trim piece, and installing the uninstalled piece in a horizontal position on the second wall and with the first free end thereof in abutment with the obverse face of the first block of the piece installed in step (A); 
     (E) (i) removing the second block from an uninstalled piece so as to provide the elongate member thereof with a free end for abutment against the end face of the first block of another piece; and 
     (ii) installing the uninstalled piece on either the first wall or the second wall in aligned orientation with a previously installed piece and with the free end thereof in abutment with the end face of the first block of the previously installed piece; 
     (F) repeating steps (i)(i) and (E)(ii), 
     In still another aspect of the invention, there is provided a method of installing trim pieces to form decorative trim on one or more building walls, the method comprising the steps of: 
     (A) installing a said piece in a horizontal position on a first wall with the first block located at an outside corner formed by the juncture of said first wall and a second wall, and as required, any of the following steps (B) to (F) 
     (B) (i) removing the first block from an uninstalled piece so as to provide the elongate member thereof with a free end for abutment against the end face of the second block of another piece; and 
     (ii) installing the uninstalled piece on either the first wall or the second wall in aligned orientation with a previously installed piece and with the free end thereof in abutment with the end face of the second block of the previously installed piece; 
     (C) repeating steps (B)(i) and B(ii), 
     (D) removing the second block from an uninstalled piece so as to provide the elongate member thereof with a free end for abutment against the face of another trim piece, and installing the uninstalled piece in a horizontal position on the second wall and with the first free end thereof in abutment with the reverse face of the first block of the piece installed in stop (A); 
     (E) (i) removing the second block from an uninstalled piece so as to provide the elongate member thereof with a free end for abutment against the end face of the first block of another piece; and 
     (ii) installing the uninstalled piece on either the first wall or the second wall in aligned orientation with a previously installed piece and with the free end thereof in abutment with the end face of the first block of the previously installed piece; 
     (F) repeating steps (EXi) and (E)(ii). 
     In yet another aspect of the invention, there is provided a method of installing trim pieces to form decorative trim on a common building wall, the method comprising the steps of: 
     (A) installing a said piece in a horizontal position on the common wall, and as required, any of the following steps (B) to (F): 
     (B) (i) removing the first block from an uninstalled piece so as to provide the elongate member thereof with a free end for abutment against the end face of the second block of another piece; and 
     (ii) installing the uninstalled piece on the common wall in aligned orientation with a previously installed piece and with the free end thereof in abutment with the end face of the second block of the previously installed piece; 
     (C) repeating steps ( 13 )(i) and B(ii), 
     (D) removing the second block from an uninstalled piece so as to provide the elongate member thereof with a free end for abutment against the face of another trim piece, and installing the uninstalled piece in a vertical position on the common wall and with the first free end thereof in abutment with the lower face or upper face of the first block of the piece installed in step (A); 
     (E) (i) removing the second block from an uninstalled piece so as to provide the elongate member thereof with a free end for abutment against the end face of the first block of another piece; and 
     (ii) installing the uninstalled piece on the common wall in aligned orientation with a previously installed piece and with the free end thereof in abutment with the end face of the first block of the previously installed piece; 
     (F) repeating steps (E)(i) and (E)(ii). 
     In still another aspect of the invention, there is provided a method of installing trim pieces to form decorative trim on the common wall, the method comprising the steps of installing a first said trim piece on the common wall; obtaining a second said trim piece with a free end at the end of the elongate member opposite the block; and installing the second said trim piece on the common wall in position with the first said trim piece to form a corner on the common wall and with the free end of the second trim piece in abutment with the face of the block of the first said trim piece. 
     In still another aspect of the invention, there is provided a method of installing trim pieces to form decorative trim on an inside corner formed by the juncture of a first and a second wall, the method comprising the steps of installing a first said trim piece on the first wall so the block is located at the inside corner; obtaining a second said trim piece with a free end at the end of the elongate member opposite the block, and installing the second said trim piece on the second wall in position to complete the inside corner with the first said trim piece and with the free end of the second trim piece in abutment with the obverse face of the block of the first said trim piece. 
     In still another aspect of the invention, there is provided a method of installing trim pieces to form decorative trim on an outer corner formed by the juncture of a first and a second wall, the method comprising the steps of: installing a first said trim piece on the first wall so the block is located at the outside corner; obtaining a second said trim piece with a free end at the end of the elongate member opposite the block, and installing the second said trim piece on the second wall in position to complete the outside corner with the first said trim piece and with the free end of the second trim piece in abutment with the reverse face of the block of the first said trim piece. 
     In still another aspect of the invention, there is provided a method of manufacturing a unitary decorative trim wherein the elongate member and block are formed as a single piece. In another feature of this aspect, the unitary decorative trim is made by an open cast molding process. In still another feature of this aspect, the unitary decorative trim is made by an injection molding process. In yet another feature of this aspect, the unitary decorative trim is from polyurethane. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a perspective view of a first embodiment of a decorative trim piece; 
     FIG. 2 is a perspective view of a second embodiment of a decorative trim piece; 
     FIG. 3 is a perspective view of several decorative trim pieces, illustrating their installation around several walls and a ceiling; 
     FIG. 4A is a perspective view of a third embodiment of a decorative trim piece, with two different blocks allowing of additional decorative trim pieces in different directions; 
     FIG. 4B is a elevation view of the decorative trim piece of FIG. 4A; 
     FIG. 4C is a cut-away view or section of decorative trim piece of FIG. 4A along cut  4 C in FIG. 4B; 
     FIG. 4D is a cut away view of an alternative embodiment of the decorative trim piece of FIG. 4A; 
     FIG. 5 is a perspective view of an installation of decorative trim pieces with a coving; and 
     FIG. 6 is a plan view of a decorative trim piece for use with a corner with an obtuse angle. 
    
    
     DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS 
     An embodiment of the invention is shown in FIG.  1 . Turning to FIG. 1, decorative trim piece  20  includes an elongate member  22  with a central axis  23  attached to a block  24 . Elongate member  22  has a obverse face  26 . Block  24  has a face  28  to which elongate member  22  is attached at end  25 . Elongate member  22  has an end  21  which is not covered. In the embodiment of FIG. 1, block  24  is a cube, and so has five faces in addition to face  28 : end face  32  which is orthogonal to axis  23 , an obverse face  34  orthogonal to end face  32 , a reverse face  38  orthogonal to end face  32 , a lower side face  30  orthogonal to end face  32 , and an upper side face  36  orthogonal to end face  32 . 
     A second embodiment of the invention is shown in FIG.  2 . Turning to FIG. 2, decorative trim piece  40  includes an elongate member  42  having a central axis  43  attached to a block  44  at end  46  and attached to a second block  48  at end  50 . Elongate member  42  has an obverse face  52 . Block  44  has a face  54  to which elongate member  42  is attached at end  46 . In the embodiment of FIG. 2, block  44  is a cube, and so has five faces in addition to face  54 : end face  60  which is orthogonal to axis  43 , an obverse face  62  orthogonal to end face  60 , a reverse face  58  orthogonal to end face  60 , a lower side face  56  orthogonal to end face  60 , and an upper side face  64  orthogonal to end face  60 . Similarly, block  48  has a face  66  to which elongate member  42  is attached at end  50 . Block  48  is a cube, and so has five faces in addition to face  66 : end face  72  which is orthogonal to axis  43 , an obverse face  68  orthogonal to end face  72 , a reverse face  76  orthogonal to end face  72 , a lower side face  14  orthogonal to end face  72 , and an upper side face  70  orthogonal to end face  72 . 
     The trim piece embodiment  20  in FIG.  1  and the trim piece embodiment  40  in FIG. 2 are related in that, if a square cut is made in the elongate member  42  of FIG. 2, a trim piece embodiment  20  and an inverse of trim piece  20  are created. 
     The trim pieces of the invention are provided as single pieces to the consumer and are thus called “unitary”. A preferred manufacturing process is to prepare the piece in a mold (such as an open-cast mold). In such a process it is thus convenient to manufacture all portions of the piece in a single step. This does not imply that during the manufacturing stage, a block and an elongate member of a trim piece could not be manufactured as separate parts and affixed to each other for sale to a consumer. 
     The installation of the decorative trim pieces is illustrated in FIG.  3 . Tuning to FIG. 3, walls  80 ,  82  and  84  are attached to a ceiling  86 . Two alternative installations of several decorative trim pieces  88  and  90  are shown. 
     Several trim pieces  88  includes: decorative trim piece  100  which has block  102  attached to elongate member  104 ; decorative trim piece  106  which has block  108  attached to elongate member  110 ; decorative trim piece  112  which has block  114  attached to elongate member  116 ; decorative trim piece  118  which has block  120  attached to elongate member  122 ; and elongate member  124  which extends off the edge of the figure. 
     In installation, decorative trim piece  106  is attached to the ceiling  86 . Trim piece  112  is in turn placed so elongate member  116  abuts reverse face  130  of block  108 . This creates a turn in the trim around a imaginary ninety degree outer corner. Similarly, trim piece  118  is in turn a placed so elongate member  122  abuts obverse face  134  of block  114 . This creates a turn in the trim around a imaginary ninety degree inner corner. In turn, elongate member  124  may be abutted against end face  138  of block  120 . This extends the trim along the axis of trim piece  118 . Similarly, end face  140  of block  102  of trim piece  100  may be abutted against end  142  of elongate member  110  to extend the trim in the axis of trim piece  106 . 
     In FIG. 3, the several trim pieces  88  have elongate members that simply present a curved obverse face. The blocks have a square point on their lower faces. 
     It should be noted that, if the elongate members of trim pieces  88  are cut to the appropriate lengths (by making square cuts in the elongate members) and moved in the direction of arrows  92  and  94 , the several trim pieces  8 : could fit snugly against walls  80 ,  82  and  84 . 
     Several trim pieces  90  includes; trim piece  144  which has block  146  attached to elongate member  148 ; trim piece  150  which has block  152  attached to elongate member  154 ; trim piece  156  which has block  158  attached to elongate member  160 ; trim piece  162  which has block  164  attached to elongate member  166 ; and elongate member  168  which extends off the edge of the figure, 
     In installation, trim piece  150  is attached to wall  84  in position so that block  152  rests in corner  133 . Trim piece  144  is in turn placed so end face  170  of block  146  abuts elongate member  154 . This extends the trim in the same axis as trim piece  150 . 
     Trim piece  156  is cut (by making a square cut in elongate member  160 ) and placed X attached to wall  32  so that end  173  of elongate member  160  abuts obverse face  172  of block  152 , and reverse face  174  of block  158  faces down wall  80 . This creates a turn in the trim around ninety degree inner corner  133 . Similarly, trim piece  162  is cut (by making a square cut in elongate member  166 ) and placed attached to wall  80  so that end  177  of elongate member  166  abuts reverse face  174  of block  158 , and block  164  rests against wall  80  so that lower face  178  of block  164  faces down wall  80 . Further trim pieces (represented by elongate member  168 ) may be placed in a direction orthogonal to lower face  178 . This creates a ninety-degree corner in the trim on common wall  80 . 
     It should be noted that, if the elongate members of trim pieces  90  are cut to the appropriate lengths (by making square cuts in the elongate members) and moved in the direction of arrows  96  and  98 , the several trim pieces  90  could fit snugly against ceiling  86 . 
     It should be noted that block  164  is a different shape than blocks  146 ,  152  and  153 . The face against which an end of an elongate piece is to abut, lower face  178 , should be of a size suitable to have the end of a decorative trim piece abut against it, or to be of similar size to the other faces which abut the end of an elongate piece. Since the installation takes a 90 degree turn to a different plane than the previous decorative trim pieces in the several decorative trim pieces  90 , a differently shaped block is needed. 
     The cuts needed to install decorative trim pieces as illustrated in FIG. 3 are square cuts, not mitre cuts, Square cuts are much easier to make properly than mitre cuts, and particularly so for the “do it-yourself” home improvement market. 
     As seen in FIG. 3, in the multiple trim pieces  90 , two types of blocks are used: the thinner blocks  146 ,  152  and  158 , and thicker block  164 . These different blocks are used, respectively, to run the trim either in a straight line along a wall or around an inner or outer corner, and to run the trim around a corner on a wall. 
     A particularly preferred embodiment is a trim piece with two different blocks to allow the trim pieces to be aligned with each other, installed around inside corners, around outside corners, or to form 90 degree turns (in either an inner or outer direction), or both as desired. This is further explained in FIGS. 4A and 4B. Turning to FIG. 4A, trim piece  180  has an elongate member  182  with two differently-shaped blocks  134  and  186 . This trim piece  180  may be seen in elevation view from the obverse face  190  in FIG.  4 B. Tuning to FIG. 4B, block  134  has a length A on sides  192  and  194 . In contrast, block  186  has a length A on side  196  but a length B on sides  198  and  200 . FIG. 4C is a side view along cut  4 C in FIG.  4 B. Turning to FIG. 4C, block  186  has a length A on side  188  and a length B on side  200 . Decorative obverse side  190  may be somewhat shorter (but is usually not longer) than the length of side  200 , a seen in FIG. 4C, where decorative obverse side has a length of C. 
     Since block  186  has a length of A in only sides  188  and  196  and not in side  198 , block  196  only allows ninety degree changes in direction in the plane of elongate member  182  rotated around an axis  202 . In contrast, block  184  has sides  192 ,  194  and  208  with a length A, and so allows ninety degree changes of direction from axis  207  as well as allowing the trim to continue in the direction of axis  207 . 
     As seen in FIG. 4C, the elongate member  182  extends to lie along side  188  and side  200 . When installed, trim piece  180  is attached to an abutting surface, typically along side  188 , although attachment along either or both of sides  188  and  200  is possible. However, as seen in FIG. 4D, elongate member  182  only needs to run partially along sides  188  and  200  (portions  202  and  204 , respectively) to allow for attachment to abutting surfaces. 
     In a preferred embodiment, the trim pieces are sold with a block arrangement as seen in trim piece  180  of FIG. 4A, with instructions to cut off either of the blocks  184  and  186  (and ends of elongate member  182 ) as necessary. Alternatively, trim piece  180  could be constructed so the blocks  184  and  186  are attached to elongate member  182  by a frangible web and are easily detached, although as a practical matter this would require injection molding rather than open cast molding to produce. The trim pieces may be made from polyurethane. The relative dimensions of the decorative trim pieces, such as A and B in FIGS. 4B and 4C, and the length of the elongate members, may be varied to suit the application or particular installation. The style of the decoration or ornamentation and the sizes of the decorative trim pieces may be varied to suit particular installations and applications. In some cases, the overall length of the trim piece would vary from 6 feet to 12 feet with A being around 1¼ inch and B around 1 inch. It would be possible to have the elongate member range from 12 inches to 3 feet to 20 feet or even longer depending upon the application. The lengths A can also vary, being 6 inches, 12 inches or even 36 inches, and length B also varying, with lengths such as 5 inches, 10 inches or 30 inches, FIG. 5 shows the trim pieces used in conjunction with a coving. Turning to FIG. 5, there is a ceiling  210 , and walls  212 ,  214  and  216 , Trim pieces  218 ,  220  and  222  are attached to the ceiling  210 , while trim pieces  224 ,  226  and  228  are attached to walls  212 ,  214  and  216 . Covings  230  and  232  are attached to the ceiling and walls to abut the trim pieces, and are mitred at corners  234  and  236 . 
     Some faces of the blocks in FIGS. 1,  2 ,  3  and  4 A- 4 D have been described as “orthogonal” to the central axis of the various trim pieces. It is to be understood that “orthogonal” means orthogonal within the tolerances commonly encountered in the building profession. In particular, the description of the fares as “orthogonal” should be taken to encompass variations from strict orthogonality that would still permit the trim pieces to be effectively used as described in this application. 
     It should also be recognized by those skilled in the art that similar decorative trims can be produced to fit around inside or outside corners with angles at other than right angles. FIG. 6 shows a decorative trim piece  300  with an elongate member  302  and block  304 . Face  306  is at an obtuse angle  308  to central axis  310  of elongate member  302 , allowing trim piece  300  to be used with corresponding obtuse corners. Similarly, face  312  is at an acute angle to central axis  310 , allowing trim piece  300  to be used with corresponding acute corners. 
     Those skilled in the art will appreciate that various modifications of detail may be made to the preferred embodiments described herein, which would come within the spirit and scope of the invention as described in the following claims.