BLADE SHARPENING APPARATUS
A blade sharpening apparatus includes a base member including a front face and a rear face and a blade sharpening member attached to the base member and being adapted to straighten a blade of a knife. The blade sharpening apparatus further includes an edge sharpener disposed within the base member and adapted to sharpen an edge of a knife.
This application claims the benefit of U.S. Provisional Patent Application No. 61/589,579 filed on Jan. 23, 2012, and entitled “Blade Sharpening Apparatus,” the disclosure of which is incorporated herein in its entirety.
BACKGROUND1. Field of the Disclosure
The present disclosure relates generally to an apparatus for unrolling and sharpening a cutting edge on a blade that has its edges rolled or dulled. More specifically, the disclosure is directed toward an improvement including an edge sharpening device.
From time to time it becomes necessary to straighten, realign, and/or sharpen the microscopic edge of a cutting tool such as a knife. During use, the edge of a blade becomes rolled or turned from direct contact with hard objects. It is important to maintain a uniform pressure and a proper even edge angle when sharpening a cutting edge. Previous sharpening devices have involved complex implements that commonly remove material from the cutting edge. Additionally, many of the previous devices are designed for use either only by a right-handed or left-handed person while sharpening one side of the edge at a time, not both. The present disclosure relates to a sharpener having a substantially enclosed versatile biasing assembly that resists contamination during use and provides for outstanding cleaning.
2. Description of the Background
U.S. Pat. No. 6,866,569 owned by the applicant herein describes an apparatus for straightening and sharpening a cutting edge of a blade. In addition, U.S. Pat. No. 5,478,272 (“the '272 patent”), also owned by applicant herein, describes an apparatus for sharpening a cutting edge on a blade.
Earlier devices for sharpening blades fall into three broad categories: (a) devices having sharpening elements in permanent fixed relationship such as that disclosed in U.S. Pat. Nos. 578,440; 1,851,520; 1,909,743; 2,767,530 and 5,163,251; (b) devices having sharpening elements in movable relationship to each other with fully exposed biasing assemblies such as that disclosed in U.S. Pat. No. 4,934,110; and (c) devices having sharpening elements in movable relationship to each other with biasing assemblies not shielded from debris such as that disclosed in U.S. Pat. Nos. 1,041,631; 1,570,083; 2,124,646; 2,885,836; 4,550,632; and 4,624,079 as well as Patent Nos. GB 293,785 and GB 517,242.
There are problems and limitations with all of these earlier devices. Devices having sharpening elements in fixed relationship to each other are relatively inefficient, needing considerably more resistance when passing a blade between the elements in order to sharpen the blade and may not provide optimal sharpening of the blade. These arrangements often remove perceptible metal fragments from the blade, which shortens the useful blade life and is undesirable for contamination reasons.
In movable element arrangements, exposed biasing means, such as counterweights, lever arms, springs and the like, are prone to collect food particles and other debris during use. These sharpening devices are often used in food processing plants where the blades to be sharpened are full of meat particles. Where the spring is not shielded from debris that may accumulate during use, this condition can cause related problems of contamination and disease.
In certain food industries, governmental authorities regulate and inspect the processing of food for sale to consumers. While many sharpening devices produce a sharp blade, these prior devices have disadvantages of exposed parts or configurations that collect debris and contribute to the problems of contamination and disease. Additionally, cleaning the exposed parts of known devices is costly as these require specific attention to the meshed windings of springs and counterweights and the like. Cleaning may require disassembly of the housing in order to clean the apparatus and remove the debris. Sometimes when an operator is using prior art devices, the operator may be of the misconception, in not seeing the debris that is collecting, that all is well and the apparatus does not need cleaning, which in fact is not the case. Thus, there is a need for a blade sharpening apparatus of the present disclosure that eliminates operator error due to unseen contamination, reduces cleaning and maintenance costs, eliminates contamination thereof, and provides for unrolling and sharpening of blades.
SUMMARYAccording to one illustrative embodiment, a blade sharpening apparatus comprises a base member including a front face and a rear face and a blade sharpening member attached to the base member and being adapted to straighten a blade of a knife. The apparatus further includes an edge sharpener disposed within the base member and adapted to sharpen an edge of a knife.
According to a further illustrative embodiment, a blade sharpening apparatus includes a base member including a front face and a rear face and a slot defined in said base member adapted to receive and guide a blade to be sharpened. The apparatus further includes a blade sharpening member attached to the base member and being adapted for operation upon guidance of the blade through the slot and an edge sharpener disposed adjacent an end of the slot or an edge of the base member and adapted to sharpen an edge of a knife.
According to yet another illustrative embodiment, a blade sharpening apparatus includes a base member including a front face and a rear face and a slot defined in said base member adapted to receive and guide a blade to be sharpened. The apparatus further includes a blade sharpening member attached to the base member and being adapted for operation upon guidance of the blade through the slot and a cavity disposed within the rear face of the base member adjacent the slot or an edge of the base member. An edge sharpener is disposed within the cavity and adapted to sharpen an edge of a knife, the edge sharpener including first and second opposing sharpening members forming a V-shaped channel and an attachment mechanism for retaining the edge sharpener within the cavity.
The above mentioned and other features of this disclosure and the manner of obtaining them will become more apparent, and the disclosure itself will be best understood by reference to the following description of embodiments of the disclosure taken in conjunction with the accompanying drawings in which:
Other aspects and advantages of the present disclosure will become apparent upon consideration of the following detailed description, wherein similar structures have like or similar reference numerals.
DETAILED DESCRIPTIONThe present disclosure is directed to a blade sharpening apparatus. While the present disclosure may be embodied in many different forms, several specific embodiments are discussed herein with the understanding that the present disclosure is to be considered only as an exemplification of the principles of the blade sharpening apparatus disclosed herein, and it is not intended to be limited to the embodiments illustrated.
In the Figures, like reference numerals indicate the same elements throughout. Referring to
The base member 12 is provided with stop members 34, 36 and 38, preferably pins with knobs on the distal ends, which are configured to control and limit the rotation of the sharpening members 28, 30, and 32 between a first “at rest” position, as illustrated by the solid lines in
The base member 12 is generally formed of a hard durable plastic, such as polypropylene, that is easily cleaned by water and/or a cleansing solution. The base member 12 can be formed of any desired shape.
Rotatable posts 44 and 46 extend outwardly from the front face 14 of the base member and are rotatable about a central axis of the apertures 20 and 22 respectively. Sharpening rods 30 and 32 are secured to post 46 for rotation therewith and sharpening rod 28 is secured to post 44. As best shown in
The blade sharpener 10 includes top guide rails 48 and 50 so as to allow a blade to be easily inserted at the upper portion of the slot 18. The guide rails 48 and 50 may be formed of metal and angled toward the entrance 19 of the slot 18 to guide a blade into the slot 18 without the blade contacting the base member 12. Alternately, the guide rails 48 and 50 can be offset with one higher than the other as shown in
The sharpening members 28, 30 and 32 are manufactured from suitable material to sharpen a blade, such as, 440 C stainless steel hardened to 59-60 Rockwell C Standard by heat treating or the like. The sharpening members 28, 30 and 32 are illustrated as curved in shape but can also be straight as shown in the embodiments of
The stop members 34, 36 and 38 can be manufactured from steel, plastic, or other suitable material as is known in the art to be durable and to withstand the rigors of use. The stop members 34, 36 and 38 may be pins that have a shoulder that will be flush when the pins are pressed into the base. Since the stop members go all the way though the base member 12, the stop members 34, 36 and 38 can be more easily removed and reassembled if the stop members 34, 36 and 38 become worn out.
The biasing members 24 and 26 can be made from rotary coil torsion springs having two free ends. In an illustrative embodiment, each torsion spring provides approximately 0.51-0.55 pound-inches of torque to the rotatable posts 44, 46 and the sharpening members 28, and 32 respectively connected thereto. The torsion spring may be selected to provide such biasing torque although other tensions and torque specifications are contemplated depending on the desired application. Other resilient biasing mechanisms capable of accomplishing the same result could be substituted for the torsion spring mechanism.
The base member 12 further includes mounting holes 64 so that the blade sharpening apparatus 10 can be secured to a work station, countertop, machine, assembly line or the like. Bolts can be inserted through mounting holes 64 and mounting surface, and then fastened with nuts and washers as appropriate. Alternately, the blade sharpener 10 can be mounted on the top of a work table or cutting board using grooves 65 in the bottom lip of base member 12.
The posts 44 and 46 can be formed from DELRIN plastic or other suitable material as will be apparent to one skilled in the art. The posts 44 and 46 both include a front cover portion 68 in the form of a skirt that overlies and seals the apertures 20 and 22 on the front face 14 of the base member 12. The front cover portion 68 is rotatably received in a recess 70 (
The caps 97 and 98 seal the apertures (i.e., 20 and 22) on the rear face 16 of the base member 12 similar to the rear cover portions 58 discussed below and illustrated in
As shown in
In operation, a blade with rolled edges is positioned at the top of slot 18 and passed downwardly to the bottom of the slot 18 through the sharpening members 28, 30, and 32. The blade is pulled straight down until the sharpening members 28, 30 and 32 contact stop member 36. Then with light pressure, the blade is drawn across the sharpening members 28, 30, and 32 until the tip of the blade clears the sharpening members 28, 30, and 32 and the sharpening members 28, 30, and 32 spring back to the stop members 34 and 38 respectively. This motion unrolls curled edges of the blade.
After the straightening procedure, the blade may also be sharpened. At the top of the slot 18, the handle or hilt end of the blade is positioned close to the front face 14, while the pointed end of the blade extends well beyond the rear face 16, depending on the length of the blade. The blade is ideally pulled about three-quarters of the way down the slot 18 through the sharpening members 28, 30, and 32 in one continuous motion. As the blade is drawn from the top of the slot 18 to the bottom, it is also drawn horizontally through the slot 18 so the entire length of the blade is sharpened from the hilt to the point. The sharpening members 28, 30, and 32 contact and sharpen the cutting edge of the blade. As the blade moves downwardly the sharpening members rotate and move downwardly with the blade against the torque of biasing members 24 and 26. The sharpening members 28, 30, and 32 rotate from the first position as shown in full lines in
Referring to
The base member 12 is provided with stop members 34, 36, and 38 to control and limit the rotation of the sharpening members 28, 30, and 32 between a first “at rest” position, as illustrated by the solid lines in
Rotatable posts 44 and 46 extend outwardly from the front face 14 of the base member and are rotatable about a central axis of the apertures 20 and 22 respectively. Sharpening rods 30 and 32 are secured to post 46 for rotation therewith and sharpening rod 28 is secured to post 44.
The blade sharpener 10 includes top guide rails 48 and 50 so as to allow a blade to be easily inserted at the upper portion of the slot 18. The guide rails 48 and 50 may be angled toward the slot 18 to guide a blade into the slot 18 without the blade contacting the base member 12. The gap between guide rails 48 may be slightly narrower than the slot 18.
As best shown in
The blade sharpening apparatus 10 further includes rear cover portions 58 for sealing the apertures 20 and 22 on the rear face of the base member 12.
The operation of the blade sharpening apparatus embodiment of
In operation, the biasing members of
Referring to
A pair of rotatable posts 92 is provided, with a post extending through each aperture 20B, 22B. Each post is threaded at both ends with a nut 93 secured over the post at the rear thereof, as illustrated in
The operation of the blade sharpening apparatus of
A further embodiment of a blade sharpening apparatus 10 is shown in
An edge sharpener 200 may be placed at the bottom of slot 18. Guide rails 48, 50 similar to those illustrated in connection with any of
A first embodiment of an edge sharpener 200 is depicted in
As best seen in
Still referring to
As best seen in
The rods 212a, 212b of the edge sharpener 200 of
A second embodiment of an edge sharpener 400 is depicted in
Referring to
A further embodiment of an edge sharpener 400 similar to that of
A further embodiment of a blade sharpening apparatus 10 as seen in
As seen in
During use of the blade sharpening apparatus 10, a user may draw a knife through the rods 212a, 212b or the blades 404a, 404b of the edge sharpener 200, 400 one or more times to achieve a desired edge sharpness for the knife. Ceramic and carbide have the ability to remove edge material, thereby transforming a blunt edge to a sharp edge. The addition of one or more edge sharpeners 200, 400 to the sharpening members 28, 30, and 32 of the blade sharpening apparatuses 10 of
While three edge sharpeners 200, 400 are depicted in
The edge sharpeners 200, 400 may be utilized with any of the blade sharpening apparatuses 10 disclosed herein. If multiple edge sharpeners 200, 400 are utilized within a blade sharpening apparatus 200, 400, the edges sharpeners 200, 400 need not be the same. In particular, any combination of ceramic and/or carbide blade sharpeners 200, 400 may be utilized.
Any of the embodiments described herein may be modified to include any of the structures or methodologies disclosed in connection with other embodiments.
Further, although directional terminology, such as front, back, upper, lower, etc. may be used throughout the present specification, it should be understood that such terms are not limiting and are only utilized to convey the orientation of different elements with respect to one another.
The above description is intended to be illustrative and not limiting. Although the illustrative embodiments are illustrated and described in connection with particular types of blade sharpening apparatuses, they may be adapted for use with a variety of blade sharpening apparatuses. Other embodiments and equivalent tools are envisioned. Various features have been particularly shown and described in connection with the illustrated embodiments, however, it must be understood that these particular embodiments are merely illustrative and that the disclosure is to be given its fullest interpretation.
Claims
1. A blade sharpening apparatus comprising:
- a base member including a front face and a rear face;
- a blade sharpening member attached to the base member and being adapted to straighten a blade of a knife; and
- an edge sharpener disposed within the base member and adapted to sharpen an edge of a knife.
2. The blade sharpening apparatus of claim 1, wherein the blade sharpening member includes a slot extending inwardly from an edge of the base member and at least two sharpening members disposed on opposing sides of the slots.
3. The blade sharpening apparatus of claim 2, wherein each of the at least two sharpening members is attached to a biasing member that biases a respective sharpening member toward an opposing sharpening member.
4. The blade sharpening apparatus of claim 3, wherein when a blade of a knife is moved along the channel, the blade pushes the sharpening members against the bias of the biasing members until the sharpening members are stopped by respective posts.
5. The blade sharpening apparatus of claim 4, wherein the sharpening members are curved.
6. The blade sharpening apparatus of claim 1, wherein a cavity is disposed within the base member and the edge sharpener is disposed within the cavity.
7. The blade sharpening apparatus of claim 6, wherein the edge sharpener includes a holder that is retained within the cavity and first and second opposing sharpening members forming a V-shaped channel.
8. The blade sharpening apparatus of claim 7, wherein the holder includes a U-shaped body forming a U-shaped channel with first and second opposing walls joined by a connecting portion, a first channel formed at least partially through the first wall and the connecting portion, and a second channel formed at least partially through the second wall and the connecting portion, wherein the first and second sharpening members are positioned within the first and second channels, respectively.
9. The blade sharpening apparatus of claim 8, wherein the first and second channels are angled such that the first and second sharpening members are disposed at an angle of between about 4 degrees and about 90 degrees with respect to one another.
10. The blade sharpening apparatus of claim 1, wherein the edge sharpener includes two blades each having a top wall, a bottom wall, an outer side wall extending between the top and bottom walls, and angled side walls extending between the top and bottom walls to form a V-shaped cavity therebetween, wherein the top walls have widths that are less than widths of corresponding bottom walls.
11. The blade sharpening apparatus of claim 10, wherein a first of the angled side walls forms an first angle with respect to a longitudinal axis of the edge sharpener that is between about 2 and about 45 degrees and a second of the angled side walls forms a second angle with respect to the longitudinal axis of the edge sharpener that is between about 2 degrees and about 45 degrees.
12. The blade sharpening apparatus of claim 11, wherein one of the first and second angled side walls includes an edge that is disposed at an outward angle of between about 0 degrees and about 45 degrees with respect to a lateral axis of the edge sharpener.
13. The blade sharpening apparatus of claim 12, wherein the other of the first and second angled side walls includes an edge that is disposed at an inward angle of between about 0 and about 45 degrees with respect to the lateral axis.
14. A blade sharpening apparatus comprising:
- a base member including a front face and a rear face;
- a slot defined in said base member adapted to receive and guide a blade to be sharpened;
- a blade sharpening member attached to the base member and being adapted for operation upon guidance of the blade through the slot; and
- an edge sharpener disposed adjacent an end of the slot or an edge of the base member and adapted to sharpen an edge of a knife.
15. The blade sharpening apparatus of claim 14, wherein the blade sharpening member includes at least two sharpening members disposed on opposing sides of the slot and wherein each of the at least two sharpening members is attached to a biasing member that biases a respective sharpening member toward an opposing sharpening member.
16. The blade sharpening apparatus of claim 15, wherein when a blade of a knife is moved along the channel, the blade pushes the sharpening members against the bias of the biasing members until the sharpening members are stopped by respective posts.
17. The blade sharpening apparatus of claim 14, wherein the edge sharpener includes a holder that is retained within the cavity, first and second opposing sharpening members forming a V-shaped channel, and a U-shaped body forming a U-shaped channel with first and second opposing walls joined by a connecting portion, a first channel formed at least partially through the first wall and the connecting portion, and a second channel formed at least partially through the second wall and the connecting portion, wherein the first and second sharpening members are positioned within the first and second channels, respectively.
18. The blade sharpening apparatus of claim 14, wherein the edge sharpener includes two blades each having a top wall, a bottom wall, an outer side wall extending between the top and bottom walls, and angled side walls extending between the top and bottom walls to form a V-shaped cavity therebetween, wherein the top walls have widths that are less than widths of corresponding bottom walls.
19. The blade sharpening apparatus of claim 18, wherein a first of the angled side walls forms an first angle with respect to a longitudinal axis of the edge sharpener that is between about 2 and about 45 degrees and a second of the angled side walls forms a second angle with respect to the longitudinal axis of the edge sharpener that is between about 2 degrees and about 45 degrees.
20. A blade sharpening apparatus comprising:
- a base member including a front face and a rear face;
- a slot defined in said base member adapted to receive and guide a blade to be sharpened;
- a blade sharpening member attached to the base member and being adapted for operation upon guidance of the blade through the slot; and
- a cavity disposed within the rear face of the base member adjacent the slot or an edge of the base member; and
- an edge sharpener disposed within the cavity and adapted to sharpen an edge of a knife, the edge sharpener including first and second opposing sharpening members forming a V-shaped channel and an attachment mechanism for retaining the edge sharpener within the cavity.
Type: Application
Filed: Jan 22, 2013
Publication Date: Feb 6, 2014
Applicant: Primedge, Inc. (Elk Grove Village, IL)
Inventors: Ivo Cozzini (Lincolnwood, IL), Alexander Cozzini (Lincolnwood, IL), Cornelio Nunez (River Grove, IL)
Application Number: 13/746,511
International Classification: B24D 15/08 (20060101);