Patent Publication Number: US-11020845-B2

Title: Routing adapter for wide shallow recesses

Description:
FIELD OF THE INVENTION 
     The present invention relates in general to a router adapter housing and more particularly, this invention relates to a router adapter housing that connects a wide router saw with a right-angle grinder. 
     BACKGROUND OF THE INVENTION 
     Woodworking machines, such as routers, which support a vertical rotating spindle that carries a cutting tool for the purpose of forming grooves in lumber are well known; however, conventional routing and similar woodworking machines normally are restricted to one unit. Plunge type routers offer cutting depth adjustment, but over a rather narrow range of cutting diameters for the bits. They all have an integral motor built in. In U.S. Pat. No. 4,913,204, a biscuit planar-jointer is disclosed by Moores et al with an integral drive motor with a drive shaft at a 90-degree angle to the plane of a cutting blade. Prior Art also discloses a typical one piece electric router under patent number U.S. Pat. No. 1,109,755. Another exemplary type of router disclosed by Prientka is show in U.S. Pat. No. 6,726,414. Willets, in British Patent GB 2,350,084, discloses an adaptor for making a right-angle grinder motor into either a router or biscuit planar-jointer. In many respects, the woodworking apparatus according to the present invention substantially departs from the conventional concepts and designs of the prior art, particularly with respect to cutting width and depth adjustment. 
     SUMMARY OF THE INVENTION 
     The present invention provides a cost-effective way of attaching a router adapter housing to a standard right angle grinder by way of a threaded coupling. It includes a truncated pyramid housing having a threaded central aperture configured to accommodate an adjustment nut mating with the threaded central aperture and an arbor. A cutting blade is removably fastened to the arbor from the wider underside of the truncated pyramid housing. At least one handle is removably attached to the housing. 
     OBJECTS OF THE INVENTION 
     It is therefore one of the primary objects of the present invention is to provide the means of combining the desirable convenience of turning a right angle grinder into a router. 
     Another object of the present invention is to provide an attachment for a right angle grinder capable of cut width at least three times what typical routers can do. 
     Still another object of the present invention is to have an adjustable cutting depth with a range of 0″ to ⅜″ of an inch for the purpose of cutting wide grooves or recesses in lumber. 
     Still another object of the present invention is to have replaceable blades that are attached by a five bolt pattern arbor. 
     An additional object of the present invention is to protect the hands and fingers from possible danger with a large shroud on the handles. 
     Still additional object of the present invention is to have the ability to attach directly to a right angle grinders ⅝″×11 male threaded shaft. 
     Yet another object of the present invention is to have a base plate that will act as a guide when routing through lumber. 
     In addition to the various objects and advantages of the present invention described with some degree of specificity above, it should be obvious that additional objects and advantages of the present invention will become more readily apparent to those persons who are skilled in the relevant art from the following more detailed descriptions of the invention, particularly, when such description is taken in conjunction with the attached drawings figures and with the appended claims. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  provides a bottom perspective view of the routing apparatus of the invention. 
         FIG. 2  illustrates a detailed exploded isometric view of the present invention with parts shown. 
         FIG. 3  provides a top perspective view showing the saw blades. 
     
    
    
     DETAILED DESCRIPTION OF A PRESENTLY PREFERRED AND VARIOUS ALTERNATIVE EMBODIMENTS OF THE INVENTION 
     Prior to proceeding to the more detailed description of the present invention, it should be noted that, for the sake of clarity and understanding, identical reference numerals throughout the several views illustrated in the figures. 
     Referring initially to  FIG. 1 , this provides a bottom perspective view of the present invention, generally shown as  10 . A housing  12 , interfaces with a cylindrical aluminum bushing serving as a cutting depth adjuster  11 . The depth adjuster  11  may be locked in place by two set screws ( 15  on  FIG. 2 ) which fit into apertures  13  in the side of the housing  12 . The depth adjuster  11  can be unlocked to permit the blades  26 , which lie in a plane parallel to the bottom of the housing  12 , to be lowered such as to allow the router to cut a wide groove, typically 4 to 8 cm across, and at the exact depth desired to permit a wide planar plate to be installed so as to be flush with the underside of a countertop for reinforcing an overhang. The blades  26  have a second diameter which is less than a first diameter of a second aperture in the bottom of the housing such that the blades  26  can move in and out to determine cutting depth. 
       FIG. 2  provides a perspective exploded isometric view of a preferred embodiment of the present router housing invention (Brace Setter generally shown as  10 .) An aluminum housing  12  has a central threaded aperture  17 , which interfaces with a cylindrical aluminum cutting depth adjuster  11 . The depth adjuster  11  is locked in place by two set screws  15  which fit into apertures  13  in the housing  12 . An arbor  24  fitting up through the center of the bushing, has a five bolt circle  36  (on  FIG. 1 ) section for anchoring three saw blades  26 . Between the three saw blades are two spacers  28 . There is a snap ring retainer clip  16  that applies pressure against a spring wave washer  18  that holds bearing  14  in place. The arbor  24  is passed through bearing  14 , then threaded onto coupling  20 , which also has a flat spot  34  for supporting a wrench. 
     At the bottom of the arbor is a five bolt circle section for anchoring three saw blade layers  26  between the three saw blades are two spacers  28 . The saw blades are secured into place by way of five number 8×32 screws  30 . A safety handle  22 , with a large shroud to protect the hands and fingers, allows the user to firmly grasp the tool. There is also an optional second support handle location. 
       FIG. 3  provides a top perspective view of the present invention  10 , showing the handle  22  with a shroud  32 . There is an option to add a second handle  22 . There is a coupling  20 , which enables operably connecting to a right angle grinder by way of ⅝″×11 threads. It can easily be transformed into a precision wood router, that having an adjustable routing depth with a range of 0 to ⅜ of an inch deep (1 cm) for the purpose of cutting recesses or grooves in building materials such as lumber. The cutting depth adjuster  11  allows for the adjustable cutting depth.