1. Field of Invention
The invention relates to bench grinders and more particularly to a multipurpose bench grinder including a left grinder assembly having a single grind wheel for sharpening a pair of scissors, and a right grinder assembly having a pair of closely opposite grind wheels for sharpening a knife or sickle.
2. Description of Related Art
Bench grinders are well known devices. A typical type of bench grinder has a single grind wheel for sharpening a knife.
Another type of bench grinder as disclosed in Taiwanese Utility Model Patent No. M271,657 has left and right grinder assemblies each having a single grind wheel of the same. In other words, it is only a bench grinder capable of sharpening two tools of the same kind (e.g., knives) at the same time.
Still, there have been numerous suggestions in prior patents for bench grinder. For example, U.S. Pat. No. 5,525,095 discloses a bench grinder having a series of improvements. Thus, it is desirable to provide a novel multipurpose bench grinder having left and right grinder assemblies for sharpening more than one kind of tool in order to overcome the inadequacies of the prior art.
It is therefore one object of the invention to provide a multipurpose bench grinder comprising a body including a base and a housing; a motor mounted in the body and having a driving shaft extending out of both sides of the body; a right grinder assembly including a first grind wheel and a second grind wheel being parallel with the first grind wheel and being separate therefrom by a predetermined gap; and a left grinder assembly including a third grind wheel, wherein each of the grind wheels is operatively connected to the driving shaft such that in response to activating the driving shaft the first and the second grind wheels together are adapted to sharpen a knife or a sickle placed therebetween or the third grind wheel is adapted to sharpen a pair of scissors.
The above and other objects, features and advantages of the invention will become apparent from the following detailed description taken with the accompanying drawings.
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In assembly, the driving shaft 6 inserts through the above components of the right grinder assembly 4 to be threadedly secured to a fastener (e.g., nut) 8 at its threaded end. As a result, the first spring 44 is compressed between the groove 432 and a hollow, intermediate neck (not numbered) of the first cylinder 45. The second spring 48 is compressed between the groove 492 and a hollow, intermediate neck (not numbered) of the second grind wheel 47. End of the cylinder 431 is fastened in the first grind wheel 45 and end of the cylinder 491 is securely fitted in the cylinder 431. Also, the cylinder 491 is fastened in the neck of the second grind wheel 47. The first grind wheel 45 is in close proximity to the second grind wheel 47. The ring 46 is fastened between the recess 452 of the first cylinder 45 and the recess 472 of the second grind wheel 47. A portion of the cylinder 491 proximate the end thereof is fastened by the ring 46. Therefore, an activation of the bench grinder 1 (i.e., the motor) will cause both the grind wheels 45 and 47 to rotate in a speed the same as the driving shaft 6.
The right grinder assembly 4 further comprises a substantially half cylindrical upper case 41 including two tabs 411 at rear and front bottom edges respectively, and a curved top opening 412 having both ends substantially terminated at the tabs 411, and a substantially half cylindrical lower case 42 including two slots 421 at rear and front top edges respectively, two projections 422 at rear and front top left corners respectively, and a cavity 423 on a left edge. On either side of the base 2 there are provided two rear and front slots 21 respectively and a bottom protrusion 22.
In assembly, the cavity 423 is put on the protrusion 22 and the projections 422 are inserted into the slots 21 for fastening the lower case 42 and the base 2 together. Further, the tabs 411 are inserted into the slots 421 for fastening the upper case 41 and the lower case 42 together. As a result, the right grinder assembly 4 is assembled with the top opening 412 being open to both the grind wheels 45 and 47.
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In assembly, the driving shaft 6 inserts through the above components of the left grinder assembly 7 to be threadedly secured to a fastener (e.g., nut) 8 at its threaded end. As a result, the third spring 74 is compressed between the groove 732 and a hollow, intermediate neck (not numbered) of the shell 75. The fourth spring 78 is compressed between the groove 792 and a hollow, intermediate neck (not numbered) of the third grind wheel 77. End of the cylinder 731 is fastened in the shell 75 and end of the cylinder 791 is securely fitted in the cylinder 731. Also, the cylinder 791 is fastened in a hollow, intermediate neck (not numbered) of the third grind wheel 77. The ring 76 is fastened between the recess 772 of the third grind wheel 77 and the recess 752 of the shell 75. A portion of the cylinder 791 proximate the end thereof is fastened by the ring 76. The frusto-conical member 761 is securely put on the trough 754 and is in close proximity to the third grind wheel 77. Therefore, an activation of the bench grinder 1 (i.e., the motor) will cause the third grind wheel 77 to rotate in a speed the same as the driving shaft 6.
The left grinder assembly 7 further comprises a substantially half cylindrical upper case 71 including two tabs 711 at rear and front bottom edges respectively, and a curved top opening 712 having both ends substantially terminated at the tabs 711, and a substantially half cylindrical lower case 72 including two slots 721 at rear and front top edges respectively, two projections 722 at rear and front top right corners respectively, and a cavity 723 on a right edge.
In assembly, the cavity 723 is put on the protrusion 22 and the projections 722 are inserted into the slots 21 for fastening the lower case 72 and the base 2 together. Further, the tabs 711 are inserted into the slots 721 for fastening the upper case 71 and the lower case 72 together. As a result, the left grinder assembly 7 is assembled with the top opening 712 being open to the third grind wheel 77.
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While the invention herein disclosed has been described by means of specific embodiments, numerous modifications and variations could be made thereto by those skilled in the art without departing from the scope and spirit of the invention set forth in the claims.