Grinding wheel structure

Abstract

A grinding wheel structure including a wheel assembly having two wheels and a grinding section defined between inner sides of the wheels for grinding a tip of a knife. A retainer ring is located between the two wheels for the tip of the knife to lean against. The grinding section is composed of multiple grinding plates. Each grinding plate has an outer lateral edge and an inner lateral edge with equal lengths. The grinding plates are fixedly inlaid in the opposite inner sides of the wheels and sequentially overlapped with the inner and outer lateral edges aligned with each other. The inner and outer lateral edges of the grinding plates together form continuous arcs for grinding the blade of a knife. The retainer ring is independently rotatable so that the grinding position can be easily determined with both sides of the blade kept at equal heights. The shake taking place when the grinding wheels rotate at high speed for grinding the blade can be overcome. A user can hold the handle of the knife with hands more stably and the blade can be uniformly ground.

1 . A grinding wheel structure comprising: 
 a wheel assembly having two identical wheels arranged opposite to each other, an outer side of each wheel having a projecting hub section, a substantially V-shaped grinding section being defined between inner sides of the wheels for grinding a tip of a knife;    a hollow rotary member having a first sleeve having a first annular section receivable in the hub section of the wheel, a first fitting section, a large diameter section and a small diameter section sequentially inward extending from the first annular section, a retainer ring being fitted around the large diameter section, the rotary member further having a second sleeve having a second fitting section and a second annular section outward extending from the second fitting section, the small diameter section being connected with the second fitting section of the second sleeve, the first and second fitting sections being respectively positioned on two sides of the retainer ring, two resilient members being respectively fitted around the first and second fitting sections for restoring the wheels, outer side of each of the first and second annular sections being formed with a depression in which a gasket is accommodate; and    a shaft rod fitted through the gaskets, the rotary member and the wheel assembly and tightened therewith by a locking member.    
   
   
       2 . The grinding wheel structure as claimed in  claim 1 , wherein the opposite inner side of each wheel is formed with a first recess, a polygonal shaft hole being formed at a center of the first recess, the projecting hub section being formed on the other side of the wheel, the first recesses of the two wheels being mated with each other, whereby a substantially V-shaped grinding section is defined between top ends of the first recesses and outer circumferences of the wheels.  
   
   
       3 . The grinding wheel structure as claimed in  claim 1 , wherein the grinding section is composed of multiple grinding plates, each grinding plate having an outer lateral edge and an inner lateral edge with equal lengths, a first side being interconnected between top ends of the outer and inner lateral edges, a second side being interconnected between bottom ends of the outer and inner lateral edges, the second side having a protruding engagement section.  
   
   
       4 . The grinding wheel structure as claimed in  claim 1 , wherein a distance from top edge of the inner side of one of the wheels to the first recess is smaller than a distance from top edge of the outer side of the wheel to the first recess, whereby an inclined section is formed between the top edge of the inner side and the top edge of the outer side and the wheel is a tapered body tapered from outer side to inner side.  
   
   
       5 . The grinding wheel structure as claimed in  claim 1 , wherein the tip of the knife is leant against the retainer ring, whereby the blade of the knife can be kept at equal height.  
   
   
       6 . The grinding wheel structure as claimed in  claim 1 , wherein the retainer ring is independently rotatable.  
   
   
       7 . The grinding wheel structure as claimed in  claim 1 , wherein the retainer ring has a width smaller than an opening travel of the wheels to ensure that the two wheels are forced by the resilient members and kept mated with each other.  
   
   
       8 . The grinding wheel structure as claimed in  claim 1 , wherein the retainer ring is fitted around the large diameter section of the first sleeve and the end faces of the first and second fitting sections on two sides of the retainer ring serve to restrict and locate the retainer ring, whereby the retainer ring can stably rotate without deflection.  
   
   
       9 . The grinding wheel structure as claimed in  claim 3 , wherein the grinding plates are fixedly inlaid in the opposite inner sides of the wheels and sequentially overlapped with the inner and outer lateral edges aligned with each other, whereby the inner and outer lateral edges of the grinding plates together form continuous arcs for grinding the blade of a knife.  
   
   
       10 . The grinding wheel structure as claimed in  claim 2 , wherein the grinding section is composed of multiple grinding plates, each grinding plate having an outer lateral edge and an inner lateral edge with equal lengths, a first side being interconnected between top ends of the outer and inner lateral edges, a second side being interconnected between bottom ends of the outer and inner lateral edges, the second side having a protruding engagement section.  
   
   
       11 . The grinding wheel structure as claimed in  claim 2 , wherein the shapes of the shaft holes of the wheels are identical to the shapes of the first and second fitting sections, whereby the rotary member can drive the wheel assembly to synchronously rotate.  
   
   
       12 . The grinding wheel structure as claimed in  claim 10 , wherein the grinding plates are fixedly inlaid in the opposite inner sides of the wheels and sequentially overlapped with the inner and outer lateral edges aligned with each other, whereby the inner and outer lateral edges of the grinding plates together form continuous arcs for grinding the blade of a knife.  
   
   
       13 . A grinding wheel structure comprising: 
 a wheel assembly having a first wheel and a second wheel arranged opposite to each other, an inner side of the first wheel being formed with a first recess, a polygonal first shaft hole being formed at a center of the first recess, the other side of the first wheel having a projecting hub section, an inner side of the second wheel being formed with a second recess, a polygonal second shaft hole being formed at a center of the second recess, the first and second wheels being mated with each other to define a grinding section for grinding the blade of a knife;    a hollow rotary member having two fitting sections on two sides, a large diameter section being integrally formed between the two fitting sections, a retainer ring being fitted around the large diameter section, the fitting section being fitted through the first shaft hole of the first wheel, a spring being fitted around the fitting section and enclosed by an annular stopper section integrally connected with the fitting section, the stopper section being accommodated in the hub section and the spring serving to restore the wheels; and    a shaft rod fitted through two gaskets, the rotary member and the wheel assembly and tightened therewith by a locking member.    
   
   
       14 . The grinding wheel structure as claimed in  claim 13 , wherein a distance from top edge of the inner side of one of the second wheel to the second recess is smaller than a distance from top edge of the outer side of the second wheel to the second recess, whereby an inclined section is formed between the top edge of the inner side and the top edge of the outer side and the second wheel is a tapered body tapered from outer side to inner side.  
   
   
       15 . The grinding wheel structure as claimed in  claim 13 , wherein the grinding section is composed of multiple grinding plates, each grinding plate having an outer lateral edge and an inner lateral edge with equal lengths, a first side being interconnected between top ends of the outer and inner lateral edges, a second side being interconnected between bottom ends of the outer and inner lateral edges, the second side having a protruding engagement section, the grinding plates being fixedly inlaid in the opposite inner sides of the wheels and sequentially overlapped with the inner and outer lateral edges aligned with each other, whereby the inner and outer lateral edges of the grinding plates together form continuous arcs for grinding the blade of a knife.  
   
   
       16 . The grinding wheel structure as claimed in  claim 13 , wherein the retainer ring has a width smaller than an opening travel of the wheels.  
   
   
       17 . The grinding wheel structure as claimed in  claim 13 , wherein the grinding section is tapered from outer side to inner side.