JPS6322943B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for sharpening scissors, shears and similar cutting instruments having two blades pivotally connected to each other. However, although the present invention is conveniently described below with particular reference to scissors, the term "scissors" as used herein refers to scissors having shears and two blades pivotally coupled to each other. It should be understood that similar cutting instruments are also included.

Effectively sharpening scissors has been a long-standing problem, and prior to the present invention, each blade was sharpened separately. That is,
In order to cut each blade over its entire length, it was generally necessary to physically separate the two blades. Because such work is tedious, sharpening tends not to be performed very often, and as a result, the useful life of scissors is considered to be extremely short.

Therefore, one object of the present invention is to provide a method that allows the two blades of scissors to be easily sharpened without separating them from each other.

Another object of the present invention is to provide a scissoring device for carrying out the above method.

To achieve these objects, according to the invention, the scissors have two blades pivotally connected to each other, the blades of the scissors being arranged such that the edge of one of the blades is approximately in the same plane as the dorsal edge of the other blade. and passing the two closed blades of the scissors between the pair of sharpening units, so that each of the pair of sharpening units can close the edge of one blade and the edge of the other blade adjacent to it. There is provided a method for sharpening scissors comprising: sharpening the blade by engaging the dorsal edges so as to simultaneously remove material of the blade therefrom.

Further, according to the present invention, a scissors sharpening device for scissors having two blades pivotally connected to each other includes a hollow housing for accommodating the two blades, and a hollow housing formed at the front end of the housing, an opening through which the blade enters and exits the housing, and a pair of sharpening units provided adjacent to the opening in the housing, between which the two scissors are closed. said closed two parts being placed in facing relation to each other to accommodate a blade;
A pair of sharpening units arranged such that respective blade edges of the blades engage with respective sharpening units, and at least one sharpening unit of the pair of sharpening units is placed close to the other sharpening unit. and a mounting means for mounting so as to be movable away from each other, and a biasing means for pressing one of the sharpening units mounted so as to be movable toward and away from the other sharpening unit in a direction toward the other sharpening unit. A scissor sharpening device is provided.

In a preferred embodiment of the scissor sharpening device according to the invention, said mounting means comprises a support member positioned within said housing and attached to said housing for limited movement relative to said housing. The sharpening unit may be attached to the support member.

The sharpening unit mounted on the support member includes a support block connected to the support member so as to be pivotable back and forth relative to the support member by pivot means; a plate element projecting from said support block for engagement with a scissor blade, said support member being engageable with said sharpening unit to limit the range of said pivot movement of said sharpening unit. It may also have a stopper means.

The biasing means may also be a spring acting between the support member and a wall of the housing, and the support member may be attached to the housing through engagement with the spring.

Further, the spring has a ridge between its ends, and the support member has a recess for receiving the ridge to form a releasable attachment between the support member and the housing. The spring has a pair of arms extending front and rear across the protrusion, the arm extending rearward being in pressure contact with the wall of the housing, and the arm extending forward. The supporting arm may be positioned between the forwardly extending arm and the support member to engage an abutment member attached to the housing.

Each of the pair of sharpening units may be mounted so as to be able to move toward and away from the other sharpening unit, and the biasing means may be individually adapted to move toward and away from the other sharpening unit. can be provided.

Each of the support members may be elongated and elongate behind each sharpening unit and may be pivotally connected to each other at their rear ends.

The support member may also be housed within the housing such that it is removable as a unit from the housing.

Embodiments of the invention will be described in more detail below with reference to the accompanying drawings.

The illustrated scissor sharpening device according to the invention includes a housing 2 and a pair of sharpening units 3 arranged opposite each other within the housing 2. As will be explained in more detail below, at least one of the sharpening units is mounted for movement towards and away from the other sharpening unit and can be biased by a spring 4 in a direction towards the other sharpening unit. The blades 5 and 6 of the scissors 7, which are closed so that the blade edge 13 of each blade is substantially flush with the back edge 29 of the other blade, are housed between a pair of sharpening units 3, and each blade 5,
The blade edge 13 of No. 6 engages with each sharpening unit 3 together with the back edge 29 of the other adjacent blade (the third
figure). When the two blades 5, 6 are moved back and forth relative to the sharpening unit 3, that is, the blades 5, 6
Both blades 5 and 6 can be sharpened when the blades 6 move in and out of the housing 2.

The housing 2 is hollow and is preferably closed on all sides and at the rear end so as to form a sheath for the scissors 7 to protect the blades 5, 6 when not in use. An elongated blade receiving passageway 8 is formed within the housing 2, into which the scissor blades 5, 6 can be moved in and out through openings 9 formed in the front end of the housing 2. If desired, at least a portion of one of the side walls 10, 11 of the housing 2 may be movable or removable to provide access to the interior of the housing 2 for maintenance, such as cleaning and repair of the sharpening unit 3, or for replacement. It can be done. This is particularly useful in the example shown in FIG.

Each sharpening unit 3 includes a honing or cutting plate element 12 which, when the blades 5, 6 are moved past this plate element 12, retains the cutting edges 13 of these blades. It has the effect of These two plate elements 12 are arranged in the vicinity of the opening 9 in the housing 2 and can be engaged over substantially the entire length of the blades 5, 6 when they are moved within the housing 2. Each plate element 12 is of a cutting type in which the constituent material of the blades is removed when the blades 5, 6 are sharpened. In the illustrated construction, the cutting plate element 12 is a cutter plate rigidly attached to a support block 14, which has an axis extending transversely to the longitudinal axis of the housing 2 (FIGS. 2 and 2). In Figure 3, the axis perpendicular to the paper surface)
It is pivotally mounted at a point 15 so as to pivot about the center. The plate element 12 is arranged in a direction transverse to the longitudinal axis of the housing 2 (vertical direction in FIGS. 2 and 3).
A portion of this plate element 12 projects from the support block 14 and forms an active edge 16 (FIG. 4) at its distal end. This edge 16 is shaped in accordance with the nature of the scissor blades 5, 6 used in the sharpening device, but is normally inclined downwardly towards one side of the housing 2, in which case both sides The edges 16 of the plate elements 12 are sloped in the same direction (FIG. 4). That is, each sharpening unit 3
The working edges 16 of are substantially parallel.

By pivoting each sharpening unit 3 at the point indicated by 15, when the scissors 7 move in and out of the housing 2, the blades 5, 6 of the scissors 7 are held in place during movement in either direction. Be able to sharpen. Stop means 17 are provided to limit the range of pivot movement of the sharpening unit 3 on either side of the intermediate pivot position of the sharpening unit 3. A biasing spring 18 (FIG. 7) may be attached to or engaged with the support block 14 to urge the support block 14 toward the neutral position.

In the structure shown in FIGS. 1 to 5, each sharpening unit 3 is attached to a pair of support members 19 housed in the housing 2, and each unit is controlled by the movement of each support member 19. Therefore, it is arranged so that it can move towards and away from another sharpening unit. The support members 19 are connected at their rear ends via pivot pins 20 so that they can be separated from each other, as shown in FIG. To retain the support member 19 assembly within the housing 2, the pivot pin 20 may extend through one or both side walls 10, 11 of the housing 2; It is preferable that the housing 2 be movable relative to the housing 2. In the preferred embodiment shown in FIGS. 1-5, the support member 19 assembly is releasably attached to the housing 2 near the opening 9 in the housing 2, as described below. The rear end of the solid body is designed to be able to swing up and down. In this way, when inserting the scissors 7 into and withdrawing them from the housing 2, the support member 19 remains attached to the housing 2 even if the scissors 7 are inclined with respect to the longitudinal axis of the housing 2. By relatively swinging, it becomes possible to align one's own central axis with the central axis of the scissors 7.

Biasing means in the form of leaf springs 4 are provided for each support member 19.
is provided so as to be pressed toward the closed position shown in FIG. As shown in FIGS. 2 and 3, the spring 4 also serves as a means for attaching the support member 19 to the housing 2. That is, each spring 4 has a raised portion 2 between its ends.
1, the raised portions 21 are located within recesses 22 formed in the respective support members 19, thereby releasably retaining the support members 19 within the housing 2. In this way, the support member 19
is attached to the housing 2, the assembly of the support member 19 will allow the scissors 7 to remain in place even if its direction does not correspond exactly to the longitudinal axis of the housing 2 during the insertion and withdrawal of the scissors 7.
Since the blade can be swung to follow the inclination of the axis in the direction of movement, the sharpening work can be performed without any problem. Furthermore, releasably mounting the support member 19 in this manner facilitates removal of the support member 19 from the housing 2 through the opening 9 for repair or replacement.

Each spring 4 has a rearwardly extending arm 23 that presses against the inside of a wall 24 of the housing 2 and a forwardly extending arm 25 that engages an abutment member 26 mounted within the housing 2. . Each abutment member 26 is arranged such that it is positioned between an adjacent support member 19 and a respective spring arm 25.

In a variant of the embodiment of FIGS. 1 to 5, one biasing spring or other means can act on both support members 19.

Another modified embodiment of the invention is shown in FIG.
3a is secured against relative movement to the housing 102, while the other sharpening unit 103b is mounted on a support member 119 whose rear end 120 is pivotally connected to the housing 102.
The leaf spring 104 is connected to the support member 119 and the housing 10.
The movable sharpening unit 103b is pressed toward the other sharpening unit 103a. Sharpening unit 1
The body 127 to which 03a is attached may be fixed to one or more walls of the housing 102 or formed integrally therewith.

In both illustrated embodiments, to help keep the scissor blades 5, 6 in proper alignment with the cutting plate element 12 during the sharpening operation,
A blade guide is provided. For example, in the first embodiment, the guide is formed by a pair of spaced side walls or flanges 28 of each support member 19. The support member 119 of the embodiment of FIG. 7 may also be provided with a similar flange.

The device according to the invention is such that when the blades 5, 6 of the scissors 7 are in the fully closed position (FIG. 5), the blade edge 13 of each blade 5, 6 lies along or along the dorsal edge 29 of the other. Used on scissors that protrude slightly beyond the

As described above, according to the scissor cutting method of the present invention, the two blades are not separated from each other, and
Moreover, you can easily sharpen the scissors while keeping the blade closed. Further, according to the scissor sharpening device of the present invention, the above method can be easily carried out with a relatively simple configuration.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an embodiment of a scissor sharpening device according to the present invention. FIG. 2 is a longitudinal sectional view of the embodiment shown in FIG. 1. FIG. 3 is a longitudinal sectional view similar to FIG. 2, but shown with the scissors inserted. FIG. 4 is a cross-sectional view taken from FIG. Fifth
The figure is a cross-sectional view of FIG. Figure 6 is the third
FIG. 2 is a perspective view showing a cross section of a portion of the scissors shown in the figure. FIG. 7 is a longitudinal sectional view showing another embodiment of the scissors sharpening device according to the present invention. 2,102: Housing, 3,103a, 10
3b: Sharpening unit, 4, 104: Biasing means (spring), 5, 6: Blade, 7: Scissors, 9: Opening, 1
2: Plate element, 13: Blade edge, 14: Support block, 17: Stopper means, 19, 109: Mounting means (support member), 21: Protrusion, 22: Recess,
23, 25: Arm, 24, 124: Wall.

Claims (1)

[Scope of Claims] 1. A pair of scissors having two blades pivotally connected to each other, closing the blades of one of the scissors so that the edge of the blade is substantially in the same plane as the back edge of the other blade; By passing the two closed blades of the scissors between the sharpening units, each of the pair of sharpening units engages the cutting edge of one blade and the adjacent back edge of the other blade. A method for sharpening scissors, comprising the steps of sharpening the blade while simultaneously removing constituent materials of the blade from these materials. 2. A scissors sharpening device for scissors having two blades pivotally connected to each other, comprising a hollow housing for accommodating the two blades, and a hollow housing formed at the front end of the housing, so that the blade can enter and exit the housing. and a pair of sharpening units provided adjacent to the opening in the housing, the pair of scissors having the closed scissors in between.
a pair of sharpening units arranged in opposing relation to each other to accommodate a pair of blades, the blades being arranged such that respective blade edges of said two closed blades engage respective sharpening units; A mounting means for mounting at least one of the pair of sharpening units so that it can move toward and away from the other sharpening unit, and one of the sharpeners mounted so that it can move toward and away from the other sharpening unit; A scissor sharpening device characterized in that it comprises biasing means for pressing one unit in the direction towards the other sharpening unit. 3. said mounting means comprises a support member positioned within said housing and mounted to said housing for limited movement relative to said housing, said sharpening unit being mounted to said support member; 3. A scissors sharpening device according to claim 2, characterized in that: 4. The sharpening unit attached to the support member is connected to the support block so as to be pivotable back and forth with respect to the support member by pivot means, and the sharpening unit is attached to the support block. a plate element projecting from the support block for engagement with the scissor blade, the support member being a stop engageable with the sharpening unit to limit the range of pivot movement of the sharpening unit; 4. A scissors sharpening device according to claim 3, characterized in that it comprises means. 5. The patent characterized in that the biasing means comprises a spring acting between the support member and the wall of the housing, and the support member is attached to the housing through engagement with the spring. A scissor sharpening device according to claim 3 or 4. 6. The spring has a ridge between its ends, and the support member has a recess for receiving the ridge to form a releasable attachment between the support member and the housing. The spring has a pair of arms extending front and rear across the protrusion, the rearwardly extending arm being in pressure contact with the housing wall, and the forwardly extending arm being in pressure contact with the wall of the housing. Claim 1, wherein the forwardly extending arm is positioned between the forwardly extending arm and the support member and engages an abutment member attached to the housing. The scissor sharpening device according to item 5. 7. Each of the pair of sharpening units is mounted so as to be able to move toward and away from the other sharpening unit, and the biasing means is provided individually for each sharpening unit. The second claim characterized in that
The scissor sharpening device according to any one of Items 6 to 6. 8. The scissors sharpening device of claim 7, wherein each of the support members extends in an elongated manner behind each sharpening unit and is pivotally connected to each other at a rear end. 9. The scissors sharpening device according to claim 8, wherein the support member is housed within the housing so as to be removable as a unit from the housing.