US3813965A - Garden tool sharpener - Google Patents

Garden tool sharpener Download PDF

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Publication number
US3813965A
US3813965A US00321862A US32186273A US3813965A US 3813965 A US3813965 A US 3813965A US 00321862 A US00321862 A US 00321862A US 32186273 A US32186273 A US 32186273A US 3813965 A US3813965 A US 3813965A
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US
United States
Prior art keywords
notch
sharpener
bit
body portion
sharpening
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00321862A
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English (en)
Inventor
C Stoutenberg
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Stanley Works
Original Assignee
Stanley Works
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Stanley Works filed Critical Stanley Works
Priority to US00321862A priority Critical patent/US3813965A/en
Priority to GB3746973A priority patent/GB1402979A/en
Priority to JP48103714A priority patent/JPS5240478B2/ja
Application granted granted Critical
Publication of US3813965A publication Critical patent/US3813965A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D15/00—Hand tools or other devices for non-rotary grinding, polishing, or stropping
    • B24D15/02—Hand tools or other devices for non-rotary grinding, polishing, or stropping rigid; with rigidly-supported operative surface

Definitions

  • a sharpener for sharpening garden tools and the like comprises an elongated member having an elongated, generally planar body portion.
  • a notch is formed intermediate the length of one of the side margins which define the longitudinal axis of the body portion. the notch having sidewall portions diverging outwardly from the base thereof.
  • the elongated member has flanges along at least portions of the side margins of the body portion to either side of the notch so as to provide surfaces for manually gripping the sharpener during use thereof.
  • a sharpening bit is detachably mounted on the body portion of the elongated member with a portion thereof extending over the notch base so as to be exposed for contact with a tool inserted in the notch. With the sharpening bit so mounted both surfaces of a tool defining a cutting edge may be sharpened by contact with the overlying portion of the sharpening bit without requiring reversal of either the tool or the sharpener.
  • a garden tool sharpener should be capable of use by both left and right handed persons with equal facility. Such sharpeners should be capable of being employed to sharpen both i of the surfaces which define the cutting edge of a tool without requiring the tool to be reversed relative to the sharpener.
  • an object of the present invention is to provide a novel and improved garden tool sharpener with versatility for use by left and right handed users with equal facility and for permitting bothof the surfaces which define the cutting edge of the tool to be sharpened thereby without requiring the position of the tool to be reversed relative to the sharpener.
  • Another object of the present invention is to provide such a sharpener which is easy to employ, is durable in operation, and yet is relatively inexpensive to manufac- SUMMARY OF THE INVENTION It has now been found that the foregoing and related objects can be readily attained in a sharpener for sharpening garden tools and the like which comprises an elongated member having an elongated, generally planar body. One of the side margins which define the longitudinal axis of the body portion of the elongated member has a notch formed therein intermediate the length thereof. In addition, the elongated member has flanges provided along at least portions of the side margins of the body portion to either side of the notch so as to provide surfaces for manually gripping the sharpenerduring use thereof.
  • the sharpener also has a sharpening bit and means detachably mounting the sharpening bit on the body portion with a portion thereof extending over the notch base so as to be exposed for contact with a tool inserted in the notch.
  • the notch is generally V-shaped in configuration, is formed in the body portion adjacent the center thereof and has sidewall portions diverging outwardly from the notch base to form an included angle of about to
  • the elongated member has a pair of flanges along each of the side margins and the flanges of each pair are disposed on opposite sides of the notch.
  • the pairs of flanges on opposite side margins are generally in alignment along the length of the body portion.
  • the sharpening bit is generally polygonal in configuration and the adjacent surface of the body portion defines a recess of complimentary configuration for receiving the bit.
  • the sharpening bit has its outer side surface extending parallel to the longitudinal axis of the body portion and intersecting a substantially equal length of each of the notch sidewall portions.
  • the detachable mounting means ineludes threaded fastening means seated in the sharpening bit and in a threaded aperture in the body portion adjacent the notch.
  • trailing, leading, upper and lower in the specification and claims are intended merely as terms to relate portions of the device with one another, and not as terms of limitation as to the orientation of the device, it being understood that the bit is disposed adjacent the forward edge of the upper surface.
  • FIG. 3 is an end elevational view thereof
  • FIG. 4 is a fragmentary bottom view thereof
  • FIG. 5 is an exploded fragmentary view in perspective of the fastener, the bit element and the body portion of the sharpener.
  • FIG. 6 is a perspective view illustrating the sharpener in use by a person to sharpen a pair of shears clamped in a vise, only portions of the hands of the person being illustrated.
  • the elongated handle member 14 has an intermediate portion generally designated by the numeral and wing portions extending therefrom and generally designated by the numerals 18, 18'.
  • Each of the wings or finger grip portions 18, 18' has a web portion 22 with its leading side edge outwardly receding towards the ends thereof relative to the longitudinal axis of the handle member 14 and with a trailing edge generally parallel to the longitudinal axis.
  • Uptumed flanges 26 and 24 are provided along the side margins of the leading and trailing edges, respectively, of the web portions 22, and these flanges are inclined outwardly therefrom.
  • the wing portions 18, 18' terminate at their ends in semicircular tab portions 28 having an aperture 30 extending therethrough by which the sharpener may be hung on a nail, peg or the like.
  • the intermediate portion 20 of the handle member 14 is of lesser width than the wing portions 18, 18 so that its trailing edge margin is inset from the trailing edge margins of the wing portions I8, 18.
  • An upstanding flange 32 is provided along the trailing edge intermediate its ends and is spaced from the flanges 24 of the wing portions 18, 18' to provide generally V- shaped guide channels 33, for a purpose to be described more fully hereinafter.
  • the forward or leading edge 44 is formed with a wide notch at its midpoint and generally designated by the numeral 40. As seen best in FIGS. 4 and 5, the notch has a generally V-shaped inner portion defined by the base 43 and the diverging leg portions 42, 42, and the bisector or axis of the notch extends substantially perpendicularly to the longitudinal axis of the handle member 14.
  • the intermediate portion 20 Adjacent the leading edge 44 the intermediate portion 20 is deformed to provide a recess 36 in the upper surface thereof dimensioned and configured to snugly seat the lower portion of the trailing and side edges of the bit element 12, which extends beyond the base 43 of the notch 40 so that its leading edge intersects the legs 42, 42' thereof.
  • the bit element 12 and the intermediate portion 20 have aligned apertures 39, 41 respectively which seat the self-tapping threaded fastener 16. In this manner, the bit element 12 may be secured firmly to the handle member 14 against relative rotation.
  • sharpening bit element 12 With the sharpening bit element 12 seated within the recess 36, at least 75 percent of its lower surface area is supported by the handle member 14.
  • the unsupported lower surface area of the sharpening area of the sharpening bit element 12 extending outwardly over the base 43 of the notch 40 is supported at its sides and rear with the plane of the forward edge of the sharpening bit element 12 symmetrically truncating the included angle formed by the notch 40 in a symmetrical fashion so that equal lengths of legs 42, 42 are dis- 4 posed directly underneath sharpening bit element 12.
  • FIG. 6 The proper use of the sharpener 10 is indicated in FIG. 6 where a-grass shears blade to be sharpened is firmly secured in a vise 52 attached to a table 54 with the cutting edge portion of the blade 50 extending over the top of the vise 52.
  • the sharpener 10 is held by a user in both hands, generally designated by the numeral 56, with the thumb 58 of each hand being placed against the surface of the associated finger grip or wing portion 18 between the flanges 24, 26 thereof and one or more of the remaining fingers 60 grasping the opposite surface of the associated finger grip portion 18.
  • the finger grip flanges 24, 26 not only provide working surfaces against which the thumbs 58 can press, but also provide protection for the thumbs 58 in case the sharpener l0 slips during use.
  • the flanges 24, 26 also remind the user to use two hands by digging into the palm of one attempting to, grab a finger grip portion 18 incorrectly.
  • the sharpener 10 is positioned relative to blade 50 with the bit 12 and the surface between the flanges generally facing the blade cutting edge 50' and handle 62, and with the leading edge of the sharpening bit element 12 contacting the blade edge 50 to be sharpened as far up the blade edge 50' towards the tool handle 62 as is possible.
  • the sharpener may then be tilted slightly clockwise or counter-clockwise in a vertical plane so as to cause the leading bit edge to be flush with the bevel to be ground.
  • the sharpener 10 is pitched toward the user at a 30 to 40 angle to the cutting edge 50 which will normally be horizontal.
  • the blade 51 which is not being sharpened will generally fit in oneof the guides 33 to enable the sharpener 10 to be placed further along the blade 50 towards tool handle 62 than would otherwise be possible and furthermore to help maintain proper orientation of the sharpener 10 relative to blade 50 during sharpening thereof.
  • the sharpener 10 is then repeatedly drawn towards the user with light easy strokes until the blade edge 50' is sharp.
  • the trailing flange 32 will tend to deflect downwards any material being abraded from blade 50, thereby protecting the user.
  • the tilt of the bit is appropriately changed midway through the sharpening process without any reversal of the sharpener or tool relative to one another.
  • the handle member is formed readily and easily from metal sheet stock in stamping and punching operations to form the notches, flanges and recess and the apertures therein may be punched or drilled.
  • the metal is provided with an electrodeposited coating to resist corrosion and provide an attractive appearance, metals such as nickel, chromium, zinc and cadmium being suitable therefore.
  • the handle member may be cast from metal, or it may be molded from a durable, wear resistant synthetic plastic such as polyamide, polyacetal, or the like.
  • the cutting bit element is formed from any of the conventional wear resistant abrasive materials including tungsten carbide, silicon carbide and refractory metal oxides. Tungsten carbide is preferred for its long lasting characteristics.
  • the notch formed in the forward or leading edge of the handle member should be positioned adjacent the midpoint of its length for greatest control during sharpening with the sharpener tilted in either direction relative to the blade being sharpened. Its configuration may vary from that illustrated but it should have a generally V-shaped base portion providing diverging legs or sides to permit contact of the blade with the bit in either direction of tilt. The included angle defined by the generally V-shaped base portion will be about 70-l00 and perferably about 80-90 as shown.
  • the novel garden tool sharpener of the present invention provides a handle member which can be used with equal facility by right and left handed persons and which may be utilized to sharpen right and left hand ground surfaces of a cutting edge without reversal of the sharpener relative to the blade being sharpened. Furthermore, in addition to providing a pair of thumb-engaging finger'grips, the handle member is of a configuration such that effective operation of the sharpener with a single hand is extremely uncomfortable, if not physically impossible, so that the opportunities for free hand accidents are severely reduced.
  • the novel sharpener permits the use of an extremely small sharpening bit and provides a high degree of support against bending for the sharpening bit, so that the sharpening bit may be economically made from such long-lived, but brittle and expensive abrasive materials as tungsten carbide. Moreover, the novel sharpener may be manufactured readily and it is easy to employ and durable in use.
  • a sharpener for sharpening garden tools and the like comprising:
  • an elongated member having an elongated, generally planar body portion and having a pair of side margins which define the longitudinal axis thereof and a notch formed intermediate the length of one of said side margins, said notch having sidewall portions diverging outwardly from the base thereof and its axis extending substantially perpendicularly to said longitudinal axis defined by said side margins of said elongated member, said elongated member having longitudinally extending flanges along at least portions of the side margins of said 7 body portion to' either side of said notch and providing surfaces for manually gripping the sharpener during use thereof;
  • c. means detachably mounting said bit on one surface of said body portion thereof extending over said notch base and only a portion of the depth of said notch to provide a surface spaced from the base of said notch and extending substantially parallel to said longitudinal axis of said elongated member, said surface being exposed for contact with a tool inserted in said notch, said notch and bit being cooperatively dimensioned to permit either side sur face of a blade edge inserted into said notch to be brought into contact with a surface of said bit extending generally parallel to said longitudinal axis of said elongated member, whereby both side surfaces of a tool defining a cutting edge may be sharpened by contact with said overlying portion of said sharpening bit without requiring reversal of either the tool or the sharpener.
  • said notch is generally V-shaped in configuration, is formed in said body portion adjacent the center thereof, and has sidewall portions diverging outwardly from said notch base to form an included angle of about to 3.
  • said elongated member has a pair of flanges along each of said side margins and the flanges of each said pair are disposed on opposite sides of said notch.
  • said detachable mounting means includes threaded fastening means seated in said sharpening bit and in a threaded aperture in said body portion adjacent said notch.
  • a sharpener for sharpening garden tools and the like comprising:
  • an elongated member having an elongated generally planar body portion and having a pair of side margins which define the longitudinal axis thereof and a notch formed intermediate the length of one of said side margins, said notch being of generally V-shaped configuration with sidewall portions diverging outwardly from the base thereof and its axis extending substantially perpendicularly to said longitudinal axis defined by said side margins of said elongated member, said base being disposed adjacent the midpoint of said longitudinal axis, said elongated member having a pair of upstanding and longitudinally extending flanges along each of said side margins, the upstanding flanges of said flange pair being disposed on opposite sides of said notch and the flange pairs on opposite side margins being generally in alignment along the length of said body portion;

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
US00321862A 1973-01-08 1973-01-08 Garden tool sharpener Expired - Lifetime US3813965A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US00321862A US3813965A (en) 1973-01-08 1973-01-08 Garden tool sharpener
GB3746973A GB1402979A (en) 1973-01-08 1973-08-07 Garden tool sharpener
JP48103714A JPS5240478B2 (enrdf_load_stackoverflow) 1973-01-08 1973-09-13

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00321862A US3813965A (en) 1973-01-08 1973-01-08 Garden tool sharpener

Publications (1)

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US3813965A true US3813965A (en) 1974-06-04

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ID=23252352

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Application Number Title Priority Date Filing Date
US00321862A Expired - Lifetime US3813965A (en) 1973-01-08 1973-01-08 Garden tool sharpener

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US (1) US3813965A (enrdf_load_stackoverflow)
JP (1) JPS5240478B2 (enrdf_load_stackoverflow)
GB (1) GB1402979A (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USD992391S1 (en) * 2023-04-14 2023-07-18 Duoming Zhong Tool sharpener

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53112082U (enrdf_load_stackoverflow) * 1977-02-14 1978-09-07
JPS61130591U (enrdf_load_stackoverflow) * 1985-02-01 1986-08-15
JPS61130592U (enrdf_load_stackoverflow) * 1985-02-01 1986-08-15

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2451203A (en) * 1946-12-31 1948-10-12 Tray George E De Scissors sharpener
US2800040A (en) * 1953-12-29 1957-07-23 Herman A Triebes Sharpening tool

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2451203A (en) * 1946-12-31 1948-10-12 Tray George E De Scissors sharpener
US2800040A (en) * 1953-12-29 1957-07-23 Herman A Triebes Sharpening tool

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USD992391S1 (en) * 2023-04-14 2023-07-18 Duoming Zhong Tool sharpener

Also Published As

Publication number Publication date
GB1402979A (en) 1975-08-13
JPS5240478B2 (enrdf_load_stackoverflow) 1977-10-12
JPS4997993A (enrdf_load_stackoverflow) 1974-09-17

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