US2017151644A1PendingUtilityA1

Sharpener for sharpening screwdrivers and a method of using same

34
Assignee: MATTHEWS SHANEPriority: Nov 26, 2015Filed: Nov 26, 2015Published: Jun 1, 2017
Est. expiryNov 26, 2035(~9.3 yrs left)· nominal 20-yr term from priority
Inventors:Shane Matthews
B24B 23/024B24B 3/60
34
PatentIndex Score
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Cited by
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References
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Claims

Abstract

An apparatus for sharpening the head of a screwdriver is disclosed. The apparatus includes a grinder stone having a grinding surface for engaging the one or more front surfaces of the head of the screwdriver for grinding the one or more front surfaces, and a rotor coupling to the grinder. The rotor, in response to a press force applied from the head of the screwdriver to the grinder stone, rotates the grinder stone for grinding the one or more front surfaces of the head of the screwdriver.

Claims

exact text as granted — not AI-modified
What is claimed is: 
     
         1 . An apparatus for sharpening a screwdriver, said screwdriver having a shank defining a longitudinal axis thereof, the shank having a predefined head profile, the head profile comprising one or more front surfaces, each of the one or more front surfaces having a non-zero angle to the longitudinal axis of the shank, said apparatus having a longitudinal axis thereof and comprising:
 a grinder stone having a grinding surface for engaging and grinding the one or more front surfaces of the screwdriver to restore the predefined head profile; and   a rotor coupling to the grinder, said rotor, in response to a press force applied from the head of the screwdriver to the grinder stone, rotating the grinder stone for grinding the one or more front surfaces of the screwdriver.   
     
     
         2 . The apparatus of  claim 1  wherein the screwdriver comprises a Phillips-type head having a plurality of tapered front surfaces, each front surface at an acute angle to the longitudinal axis of the shank; and wherein the grinder stone comprises a conical recess concentric to the longitudinal axis of the apparatus, the surface of the recess at said acute angle to the longitudinal axis of the apparatus, the surface of the recess being the grinding surface. 
     
     
         3 . The apparatus of  claim 1  wherein the screwdriver comprises a flat head having a front surface orthogonal to the longitudinal axis of the shank; and wherein the grinder stone comprises a flat grinding surface orthogonal to the longitudinal axis of the apparatus. 
     
     
         4 . The apparatus of  claim 1  wherein the screwdriver comprises a square head having a front surface orthogonal to the longitudinal axis of the shank; and wherein the grinder stone comprises a flat grinding surface orthogonal to the longitudinal axis of the apparatus. 
     
     
         5 . The apparatus of  claim 1  wherein the screwdriver comprises a square head; and wherein the grinder stone comprises a cylindrical recess, the bottom surface of the recess being the grinding surface and orthogonal to the longitudinal axis of the apparatus. 
     
     
         6 . The apparatus of  claim 1  wherein in response to the press force applied from the head of the screwdriver, the grinder rotates in a first direction. 
     
     
         7 . The apparatus of  claim 6  wherein the rotor comprises:
 at least one pin coupled to the grinder stone; and 
 a guide having at least one helical groove for engaging the at least one pin and guiding the at least one pin to slide therein. 
 
     
     
         8 . The apparatus of  claim 1  further comprising:
 a housing for receiving the grinder stone and the rotor and for supporting the grinder stone against the rotor. 
 
     
     
         9 . The apparatus of  claim 8  wherein said housing forms a passage concentric to the longitudinal axis of the apparatus for receiving and guiding the head of the screwdriver to the grinder stone of the grinder. 
     
     
         10 . The apparatus of  claim 1  wherein the rotor further comprises a biasing component sandwiched between the grinder stone and the guide for biasing the grinder stone along a second direction when the press force is reduced. 
     
     
         11 . The apparatus of  claim 10  wherein the biasing component is a spring. 
     
     
         12 . A method of sharpening a screwdriver, said screwdriver having a shank defining a longitudinal axis thereof, the shank having a predefined head profile, the head profile comprising one or more front surfaces, each of the one or more front surfaces having a non-zero angle to the longitudinal axis of the shank, said method comprising:
 forcibly engaging the one or more front surfaces with a grinding surface to apply a press force from the one or more front surfaces to the grinding surface; and   in response to the press force, rotating the grinder surface for grinding the one or more front surfaces of the screwdriver to restore the predefined head profile.   
     
     
         13 . The method of  claim 12  wherein the screwdriver comprises a Phillips-type head having a plurality of tapered front surfaces, each front surface at an acute angle to the longitudinal axis of the shank; and wherein said forcibly engaging the one or more front surfaces with a grinding surface comprises:
 forcibly engaging the one or more front surfaces with a conical grinding surface of a conical recess of a grinder stone, said conical grinding surface concentric to a longitudinal axis of the grinder stone and at said acute angle thereto. 
 
     
     
         14 . The method of  claim 12  wherein the screwdriver comprises a flat head having a front surface orthogonal to the longitudinal axis of the shank; and wherein said forcibly engaging the one or more front surfaces with a grinding surface comprises:
 forcibly engaging the one or more front surfaces with a flat grinding surface of a grinder stone, said flat grinding surface orthogonal to a longitudinal axis of the grinder stone. 
 
     
     
         15 . The method of  claim 12  wherein the screwdriver comprises a square head having a front surface orthogonal to the longitudinal axis of the shank; and wherein said forcibly engaging the one or more front surfaces with a grinding surface comprises:
 forcibly engaging the one or more front surfaces with a flat grinding surface of a grinder stone, said flat grinding surface orthogonal to a longitudinal axis of the grinder stone. 
 
     
     
         16 . The method of  claim 12  wherein the screwdriver comprises a square head; and wherein said forcibly engaging the one or more front surfaces with a grinding surface comprises:
 forcibly engaging the one or more front surfaces with a grinding bottom surface of a cylindrical recess of a grinder stone, said grinding bottom surface orthogonal to a longitudinal axis of the grinder stone. 
 
     
     
         17 . The method of  claim 12  further comprising:
 in response to the press force applied from the one or more front surfaces, rotating the grinding surface in a first direction. 
 
     
     
         18 . The method of  claim 17  further comprising:
 coupling at least one pin to the grinding surface; and wherein said in response to the press force, rotating the grinder surface comprising: 
 in response to the press force, guiding the at least one pin through at least one helical groove for rotating the grinder surface. 
 
     
     
         19 . The method of  claim 12  further comprising:
 receiving and guiding the one or more front surfaces through a passage for forcibly engaging the one or more front surfaces with the grinding surface. 
 
     
     
         20 . The method of  claim 12  further comprising:
 biasing the grinding surface to rotate in a second, reversed direction when the press force is reversed.

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