Abstract
A casing chisel system includes a two-sided casing chisel and one or more detailed chisels. The two-sided casing chisel has two chisel blades that are mirror images of each other to enable one tool for chiseling and cleaning the doorway casing on either side of the doorway. The two-sided tool simply has to be flipped around to allow cleaning of doorway casing on an opposing side of the doorway. The chisel blades may be coupled to a blade assembly that is detachably attachable to a handle assembly. The blade assembly may have a first end and second end each having a two-sided chisel blade or sanding ends with an abrasive material to allow sanding along a doorway casing. The detail chisel may be straight detail chisel having straight chisel blades or a curved detail chisel having curved chisel blades, that may extend in a radius of curvature.
Claims
1. A casing chisel system comprising: a) a two-sided casing chisel comprising: i) a first side and an opposing second side; ii) a handle assembly comprising: a handle; a first blade coupler; and a second blade coupler; iii) a blade assembly comprising: a first side chisel blade configured on said first side and comprising: a doorway edge; an extended edge; a first curved cutting end that extends from the doorway edge to the extended edge; a curved contour extending from said cutting end to a second end, opposite said cutting end of said first chisel blade; wherein the curved cutting end of the first side chisel blade has said curved contour that is a non-linear shape from the doorway edge to the extended edge that is contour matched to a casing; a second side chisel blade configured on said second side and comprising: a doorway edge; an extended edge; a first curved cutting end that extends from the doorway edge to the extended edge; a curved contour extending from said cutting end to a second end, opposite said cutting end of said second chisel blade; wherein the curved cutting end of the second side chisel blade has said curved contour that is a non-linear shape from the doorway edge to the extended edge that is contour matched to said casing; wherein the curved contour of the curved cutting end of the second side chisel blade is a mirror curved contour of the curved cutting end of the first side chisel blade; and iii) a blade support that is configured between and couples the first and second side chisel blades; wherein both the first side chisel blade and the second side chisel blade are attached to and extend from the blade support to the respective cutting edge; wherein the first blade coupler extends between the first side chisel blade and the second side chisel blade on a doorway edge side of the blade support and the second blade coupler extends between the first side chisel blade and the second side chisel blade on an extended edge side of the blade support, wherein said first blade coupler and second blade coupler each comprise a blade coupler lock configured to detachably attach the handle assembly with the blade assembly; wherein the blade assembly is detachably attachable to the handle assembly; and wherein the handle extends in alignment with the first chisel blade and the second chisel blade; b) a first detail chisel comprising: i) a handle; ii) a shank extending from said handle to a chisel arm; iii) a fulcrum configured between the shank and the chisel arm producing a fulcrum angle between 10 and 40 degrees; iv) a chisel configured on a cutting end of said chisel arm; wherein the chisel has a pair of chisel edges that extend from a connected portion at an acute chisel angle.
2. The casing chisel system of claim 1, wherein a length of the shank is greater than a length of the chisel arm.
3. The casing chisel system of claim 1, wherein the chisel arm is no more than half the length of the shank.
4. The casing chisel system of claim 1, wherein each of the pair of chisel edges extend back from the cutting end and from on the connected portion at a backset angle between 5 and 20 degrees.
5. The casing chisel system of claim 1, wherein the first detail chisel is a straight detail chisel, wherein each of the pair of chisel edges extend straight from the connected portion.
6. The casing chisel system of claim 1, wherein each of the pair of chisel edges extend back from the cutting end and from on the connected portion at a backset angle between 5 and 20 degrees.
7. The casing chisel system of claim 1, wherein the first detail chisel is a curved detail chisel, wherein each of the pair of chisel edges are curved.
8. The casing chisel system of claim 7, wherein each of the pair of chisel edges extend back from the cutting end and from on the connected portion at a backset angle between 5 and 20 degrees.
9. The casing chisel system of claim 1, wherein the first detail chisel is a curved detail chisel, wherein each of the pair of chisel edges extend in a radius of curvature from the connected portion.
10. The casing chisel system of claim 9, wherein each of the pair of chisel edges extend back from the cutting end and from on the connected portion at a backset angle between 5 and 20 degrees.
11. The casing chisel system of claim 10, wherein the connected portion is curved.
12. The casing chisel system of claim 10, wherein the connected portion extends in a radius of curvature.
13. The casing chisel system of claim 1, wherein the shank extends along a length axis of the handle of the first detail chisel.
14. The casing chisel system of claim 1, further comprising a second detail chisel comprising: a handle; a shank extending from said handle to a chisel arm; a fulcrum configured between the shank and the chisel arm producing a fulcrum angle between 10 and 40 degrees; a chisel configured on a cutting end of said chisel arm; wherein the second detail chisel has a pair of chisel edges that extend from a connected portion at an acute chisel angle; and wherein said first detail chisel is a straight detail chisel, wherein each of the pair of chisel edges of the first detail chisel extend straight from the connected portion; and wherein said second detail chisel is a curved detail chisel, wherein each of the pair of chisel edges of the second detail chisel are curved.
15. The casing chisel system of claim 14, wherein each of the pair of chisel edges of both the curved detail chisel and the straight detail chisel extend back from the cutting end and from on the connected portion at a backset angle between 5 and 20 degrees.
16. The casing chisel system of claim 1, wherein the blade assembly is detachably attachable to the handle assembly.
17. He casing chisel system of claim 16, further comprising a shaft that extends down from the handle assembly to a shaft end, wherein the shaft end is configured to extend between the first side and second side chisel blades.
18. The casing chisel system of claim 17, wherein the shaft is an extension of the handle.
19. He casing chisel system of claim 17, wherein the blade assembly further comprises a blade support that is configured between and couples the first and second side chisel blades.
20. The casing chisel system of claim 19, wherein the blade support comprises a receiving aperture for receiving the shaft end of the shaft.
Description
BRIEF DESCRIPTION OF SEVERAL VIEWS OF THE DRAWINGS
(1) The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the principles of the invention.
(2) FIG. 1 shows an exemplary two-sided casing chisel having a first side chisel blade and an opposing second side chisel blade; wherein the casing chisel blade is contour matched to chisel the doorway casing shown (CM376 industry standard style).
(3) FIG. 2 shows an exemplary two-sided casing chisel having a first side chisel blade and an opposing second side chisel blade; wherein the two-sided casing chisel is rotated 180 degrees to orient the second side chisel blade to the doorway casing shown.
(4) FIGS. 3 and 4 show side views of an exemplary two-sided casing chisel having a two-sided chisel blade consisting of a first side chisel blade and a second side chisel blade, wherein the chisel blades having cutting ends that are mirror images of each other.
(5) FIG. 5 shows a first side view of an exemplary two-sided casing chisel having a handle assembly coupled to a blade assembly.
(6) FIG. 6 shows a first side view of the exemplary two-sided casing chisel shown in FIG. 5, with the blade assembly detached from the handle assembly.
(7) FIG. 7 shows a cross sectional view of a standard CM376 casing having a doorway edge and an extended edge.
(8) FIG. 8 shows a bottom view of an exemplary two-sided casing chisel configured for the standard CM376 casing shown in FIG. 7.
(9) FIG. 9 shows a perspective view of an exemplary two-sided casing chisel configured for the standard CM376 casing shown in FIG. 7.
(10) FIG. 10 shows cross-sections of seven exemplary standard casing profiles with a width of either 2.25 inches or 2.5 inches.
(11) FIG. 11 shows a perspective view of a curved detail chisel having a curved chisel with chisel edges that are curved.
(12) FIG. 12 shows a front perspective view of a curved detail chisel having a curved chisel with chisel edges that are curved.
(13) FIG. 13 shows a front perspective view of a curved detail chisel having a curved chisel with chisel edges that are curved.
(14) FIG. 14 shows a top view of a curved detail chisel having a curved chisel with chisel edges that are curved.
(15) FIG. 15 shows a side view of a curved detail chisel having a curved chisel with chisel edges that are curved.
(16) FIG. 16 shows a bottom view of a curved detail chisel having a curved chisel with chisel edges that are curved.
(17) FIG. 17 shows a front-top perspective view of a curved detail chisel having a curved chisel with chisel edges that are curved.
(18) FIG. 18 shows a front-bottom perspective view of a curved detail chisel having a curved chisel with chisel edges that are curved.
(19) FIG. 19 shows a side view of the shank of a curved detail chisel having a curved chisel with chisel edges that are curved.
(20) FIG. 20 shows a front view of the shank of a curved detail chisel having a curved chisel with chisel edges that are curved.
(21) FIG. 21 shows a perspective view of a straight detail chisel having a chisel with straight chisel edges.
(22) FIG. 22 shows a front perspective view of a straight detail chisel having a chisel with straight chisel edges.
(23) FIG. 23 shows a front perspective view of a straight detail chisel having a chisel with straight chisel edges.
(24) FIG. 24 shows a top view of a straight detail chisel having a chisel with straight chisel edges.
(25) FIG. 25 shows a side view of a straight detail chisel having a chisel with straight chisel edges.
(26) FIG. 26 shows a bottom view of a straight detail chisel having a chisel with straight chisel edges.
(27) FIG. 27 shows a front-top perspective view of a straight detail chisel having a chisel with straight chisel edges.
(28) FIG. 28 shows a front-bottom perspective view of a straight detail chisel having a chisel with straight chisel edges.
(29) FIG. 29 shows a side view of the shank of a straight detail chisel having a chisel with straight chisel edges.
(30) FIG. 30 shows a front view of the shank of a straight detail chisel having a chisel with straight chisel edges.
(31) FIG. 31 shows a perspective view of an exemplary casing chisel system comprising a two-sided casing chisel, a curved detail chisel and a straight detail chisel.
(32) Corresponding reference characters indicate corresponding parts throughout the several views of the figures. The figures represent an illustration of some of the embodiments of the present invention and are not to be construed as limiting the scope of the invention in any manner. Further, the figures are not necessarily to scale, some features may be exaggerated to show details of particular components. Therefore, specific structural and functional details disclosed herein are not to be interpreted as limiting, but merely as a representative basis for teaching one skilled in the art to variously employ the present invention.
DETAILED DESCRIPTION OF THE ILLUSTRATED EMBODIMENTS
(33) As used herein, the terms “comprises,” “comprising,” “includes,” “including,” “has,” “having” or any other variation thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, article, or apparatus that comprises a list of elements is not necessarily limited to only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Also, use of “a” or “an” are employed to describe elements and components described herein. This is done merely for convenience and to give a general sense of the scope of the invention. This description should be read to include one or at least one and the singular also includes the plural unless it is obvious that it is meant otherwise.
(34) Certain exemplary embodiments of the present invention are described herein and are illustrated in the accompanying figures. The embodiments described are only for purposes of illustrating the present invention and should not be interpreted as limiting the scope of the invention. Other embodiments of the invention, and certain modifications, combinations and improvements of the described embodiments, will occur to those skilled in the art and all such alternate embodiments, combinations, modifications, improvements are within the scope of the present invention.
(35) As shown in FIG. 1, an exemplary two-sided casing chisel 10 has a blade assembly 16 coupled to a handle assembly 13 by the blade coupler springs 80, 80′. The blade assembly has a first side chisel blade 50 and an opposing second side chisel blade 70; wherein the casing chisel blade 70 is oriented to chisel the doorway casing 20 shown. The doorway casing extends from a doorway edge 22 to an extended edge 24 and has a curved outer surface 26. Paint 28 often collects along the base of the casing and is not appealing. The exemplary two-sided casing chisel 10 has the second side chisel blade 70 facing the casing and the second side chisel blade is a mirror image of the first side chisel blade 50 shown. The second side chisel blade has a doorway edge 72 that corresponds with the doorway edge 22 of the casing and an extended edge that corresponds with the extended edge 24 of the casing. The curved outer surface from the doorway edge to the extended edge of the second side chisel blade 70 corresponds with the curved outer surface 26 of the casing. The handle 30 has a coupled end, and an impact end 31, configured to be hit with a hammer or mallet to chisel the doorway casing. The first side chisel blade 50 is a mirror image of the second side chisel blade and has a curved outer surface 56 that extends from a doorway edge 52 to an extended edge 54. The cutting end 55 may be sharp to enable chiseling off the paint or debris from the doorway casing.
(36) As shown in FIG. 2, the exemplary two-sided casing chisel 10 shown in FIG. 1, is now configured in front of the opposing side of the doorway. In order to chisel the opposing casing 22, the two-sided casing chisel 10 must be rotated 180 degrees to present the first side chisel blade to the casing, as indicated by the bold curved arrow. The first side chisel blade 50 corresponds with the casing as shown to enable chiseling off debris along the bottom of the casing. The first side chisel blade has a curved outer surface 56 that matches the curved outer surface 26 of the casing. The first side chisel blade has a doorway edge 52 that corresponds with the doorway edge 22 of the casing and an extended edge 54 that corresponds with the extended edge 24 of the casing. The curved outer surface from the doorway edge to the extended edge of the first side chisel blade 50 corresponds with the curved outer surface 26 of the casing. In effect, the invention conveniently allows for the chiseling of all doorway casings one after the other on opposing sides in a single tool.
(37) As shown in FIGS. 3 to 6, an exemplary two-sided casing chisel 10 has a blade assembly 16 that is detachably attachable to a handle assembly 13. As shown in FIG. 3, the blade assembly is attached to the handle assembly by the blade couplers 80, 80′ that extend down between the two blades 50, 70 of the blade assembly and couple with the blade support 60, a support member extending between the two blades. The blade support 60 has coupler attachment recesses 62, 62′ configured to receive the coupler locks 82, 82′, protrusions extending from the blade couplers 80, 80′. The coupler locks 82, 82′ may snap into the coupler attachment recesses 62, 62′ to secure the blade assembly to the handle assembly as shown in FIGS. 3 and 5. As shown in FIGS. 4 and 6, the blade assembly is detached from the handle assembly.
(38) The blade assembly 16 comprises a first side chisel blade 50 and a second side chisel blade 70 coupled together by a blade support 60, which may be an H-shaped support element as shown in FIGS. 5 and 6. The blade support may have a receiving aperture 63 for receiving the shaft end 43 of the shaft 40 and coupler attachment recesses 62, 62′ for receiving the coupler locks 82, 82′, respectively, as best shown in FIG. 6. The shaft 40 may be an extension of the handle 30 or a separate piece that is coupled to the handle. As best shown in FIG. 8, the blade assembly includes a first side chisel blade 50 and a second side chisel blade 70, wherein the chisel blades have cutting ends 55, 75 and curved outer surfaces 56, 76, respectively, along the cutting ends that are mirror images of each other.
(39) FIG. 2 shows the doorway cutting edge 52, of the first side chisel blade and the extended edge 74 of the second side chisel blade is shown in FIGS. 5 and 6. An exemplary chisel blade may have cutting ends on either end or may have curved sanding ends 58, 78, opposing the cutting ends, or optionally a first curved cutting end and a second curved cutting end 55′,75′ that enable the blades to be flipped when the first curved cutting end becomes worn. The sanding ends may comprise an abrasive material to enable a user to sand along a doorway casing or the metal chisel blades may be etched with angled parallel cuts that create a filing end. The blade assembly may be simply flipped upside down and attached to the handle assembly for this purpose. As shown in FIG. 3 the blade coupler 80 extends between the two opposing chisel blades 50 and 70 and the coupler lock 82 is retained in the coupler attachment recess 62. As shown in FIGS. 4 and 6, the blade assembly 16 is detached from the handle assembly 13. As shown in FIG. 6, the blade support 60 has curved upper surfaces 61, 61′ to enable the shaft end 43 and coupler locks 82, 82′ to slide into the blade assembly 16 and lock into the recesses 62, 62′ to secure the blade to the handle.
(40) A handle assembly 13 comprises a handle 30 having an impact end 31 to receive an impact from a hammer or mallet to enable chiseling along a doorway casing. A shaft 40 extends from the handle and may be a separate piece that is attached to the handle. The shaft end 43 is configured to abut the blade support 60 at 63 to exert the chisel load to the blade assembly. Shields 32, 32′ extend down from the handle to cover the inserted end of the blades 50, 70, for safety as they protect the user from being exposed to the sharp opposite ends of the blades. Blade couplers 80, 80′ extend down from the handle assembly and have coupler locks 82, 82′, respectively that are configured to be retained by the blade support 60. As best shown in FIG. 6, the blade support is configured with coupler attachment recesses 62, 62′ for receiving and retaining the coupler locks 82, 82′.
(41) As shown in FIG. 7, a standard CM376 casing 20 has a curved outer surface 26 that extends from a doorway edge 22 that joins the door jamb and an extended edge 24 that abuts with the wall baseboard. The vertical casing may be used along the opening of a doorway. This doorway casing may have a width 21 of about 2.25 inches and a depth 23 of about 9/16 inch or 11/16 inch.
(42) Referring now to FIGS. 8 and 9, an exemplary two-sided casing chisel 10 is configured for the standard CM376 casing shown in FIG. 7. The two-sided casing chisel has two curved chisel blades 50 and 70 that are configured as mirror images to each other. A first side chisel blade 50 is configured on a first side 15 of the two-sided casing chisel and a second side chisel blade 70 is configured on a second side 17 of the two-sided casing chisel 10. The first side chisel blade 50 has a curved outer surface 56 extending from a doorway edge 52 and an extended edge 54. Likewise, the second side chisel blade 70 has curved outer surface 76 extending from a doorway edge 72 and an extended edge 74. Again, the two curved chisel blades are configured as mirror images to conveniently enable spinning the two-sided casing chisel around to chisel along the casing on opposing sides of a doorway in a single tool. The depth 65 of the exemplary two-sided casing chisel 10 may be small, to prevent any marks made on the floor from being exposed after the addition of a doorway shoe moulding around the casing and door jamb (see U.S. Pat. No. 10,676,940) or when no doorway shoe moulding is used. The shields 32, 32′ and handle 30 are shown in FIGS. 8 and 9.
(43) FIG. 10 shows cross-sections of seven exemplary standard casing profiles. Each of these casings have a curved outer surface that has a plurality of interconnected curved sections. The casings are either 2.25 inches or 2.5 inches in width and may be either 9/16 inch or 11/16 inch in height on the baseboard ends 52, 72. These casings represent about 95% of the current casing market in the U.S. The shields 32, 32′ are designed with a width greater than 2.5 inches to protect the user from being exposed to the sharp ends of the blades. Wider casings than 2.5 inches are available in the market, which may be available by special order to purchase, but a wider blade shield on the handle will be required for user safety of the casing chisel.
(44) Referring now to FIGS. 11 to 20, an exemplary detail chisel is a curved detail chisel 200 having a shank 204 extending from a connected end 205, connected with the handle 202, to a cutting end 209 having the curved chisel 210. The shank extends along a length axis 225 of the handle of the detail chisel. The curved chisel 210 has a pair of chisel edges 212, 212′ that are curved and as shown in FIG. 20, extend in a radius of curvature 213, 213′, respectively. The chisel edges are coupled together at the connected portion 214 and extend therefrom at an acute chisel angle 219. The connected portion may also extend in a radius of curvature or be curved between the two chisel edges. As shown in FIG. 19, the chisel edges extend at a backset angle 217 from the cutting end 209 which helps to properly align the chisel edge along a surface with the handle offset from the planar surface by the fulcrum angle 207. The fulcrum angle is the angle of the chisel arm 208 with respect to the shank 204, or length axis of the shank from the handle, at the fulcrum 206. The chisel arm is the extension from the shank. The shank has a length 224 that is longer than the chisel arm length 228, in this embodiment. The overall length 220 of the curved detail chisel from the handle end 203 to the cutting end 209, as shown in FIG. 14, may be configured to enable hand manipulation along casing mounted to the wall and around a door.
(45) Referring now to FIGS. 21 to 30, an exemplary detail chisel is a straight detail chisel 300 having a shank 304 extending from a connected end 305, connected with the handle 302, to a cutting end 309 having the straight chisel 310. The shank extends along a length axis 325 of the handle of the detail chisel. As shown in FIG. 29, the chisel edges extend at a backset angle 317 from the cutting end 309 which helps to properly align the chisel edge along a surface with the handle offset from the planar surface by the fulcrum angle 307. The fulcrum angle is the angle of the chisel arm 308 with respect to the shank 304, or length axis of the shank from the handle, at the fulcrum 306. The chisel arm is the extension from the shank. As shown in FIG. 30, the straight chisel 310 has a pair of chisel edges 312, 312′ that are coupled together at the connected portion 314 and extend therefrom at an acute chisel angle 319. The shank has a length 324 that is longer than the chisel arm length 328, in this embodiment. The overall length 320 of the straight detail chisel from the handle end 303 to the cutting end 309, as shown in FIG. 24, may be configured to enable hand manipulation along casing mounted to the wall and around a door.
(46) As shown in FIG. 31, an exemplary casing chisel system 201 comprises a two-sided casing chisel 10, a curved detail chisel 200 and a straight detail chisel 300. As described herein, the casing chisel system may include one of more of the two-sided casing chisels, one or more of the curved detailed chisels and/or one or more of the straight detail chisels. The system may come with a plurality of two-sided casing chisel to match the contours of various casings, as shown in FIG. 10 and with a plurality of detailed chisels that have different geometries, such as different curves or radius of curvature of the curved chisel edges for the curved detail chisel, or different acute angles of the straight chisel edges for the straight detail chisel.
(47) It will be apparent to those skilled in the art that various modifications, combinations and variations can be made in the present invention without departing from the scope of the invention. Specific embodiments, features and elements described herein may be modified, and/or combined in any suitable manner. Thus, it is intended that the present invention cover the modifications, combinations and variations of this invention provided they come within the scope of the appended claims and their equivalents.
