CN212825522U

CN212825522U - Ring knife

Info

Publication number: CN212825522U
Application number: CN202021911765.8U
Authority: CN
Inventors: 余永成; 黎广政
Original assignee: Shenzhen Qicheng Trading Co ltd
Current assignee: Shenzhen Qicheng Trading Co ltd
Priority date: 2020-09-03
Filing date: 2020-09-03
Publication date: 2021-03-30
Anticipated expiration: 2030-09-03
Also published as: WO2022048688A1

Abstract

The application provides a ring knife, which comprises a ring, a telescopic knife, a toggle switch and a reset mechanism, wherein the telescopic knife comprises a shell and a blade arranged in the shell; the toggle switch is slidably arranged on the shell and used for pushing the movable blade to extend out of the opening under the action of external force; the reset mechanism is arranged in the shell and used for driving the blade to automatically retract into the shell when the external force on the toggle switch disappears. The finger ring knife can be worn on a finger to prevent loss when not used, and the blade of the finger ring knife can be automatically retracted into the shell when not used, so that the blade can be prevented from being exposed to the outside to hurt a human body when not used.

Description

Ring knife

Technical Field

The application relates to the technical field of life apparatus devices, in particular to a finger ring knife.

Background

With the rise of electronic commerce, online shopping is becoming one of the main shopping modes of people, and the logistics industry is gradually prosperous. At the dismouting express delivery service personnel at the dismouting express delivery in-process, the use of cutter is very frequent, for example adopts the cutter to tailor packaging material, like carton, sticky tape, wiring rope etc. nevertheless general everywhere is deposited when current cutter does not use, causes the cutter to lose easily, and express delivery service personnel frequently get at dismouting express delivery in-process and take to look for the cutter and can reduce the operating efficiency. In addition, express delivery personnel forget easily after using up the cutter and withdraw the casing with the blade, and the blade exposes easy fish tail express delivery personnel outside under the condition of not using.

SUMMERY OF THE UTILITY MODEL

An object of the embodiment of the application is to provide a finger ring knife, which can be worn on a finger to prevent loss when not in use, and the blade of the finger ring knife can be automatically retracted into the shell to prevent the blade from being exposed to the outside to hurt a human body when not in use.

The embodiment of the application provides a ring knife, which comprises a ring, a telescopic knife, a toggle switch and a resetting mechanism, wherein the telescopic knife comprises a shell and a blade arranged in the shell; the toggle switch is slidably mounted on the shell and used for pushing the blade to extend out of the opening under the action of external force; the reset mechanism is arranged in the shell and used for driving the blade to automatically retract into the shell when the external force on the toggle switch disappears.

In the implementation process, the telescopic cutter is arranged on the finger ring, when the finger ring is not used, the finger ring cutter sleeve can be arranged on a finger through the finger ring by a user, the finger ring can be found at any time when the finger ring is needed to be used by the user, the time for searching the cutter is saved, and the cutter can be prevented from being lost. When the finger ring knife is worn on the finger of a user, the telescopic knife on the finger ring can be rotated to the back of the hand direction, so that the telescopic knife is prevented from influencing other operations of the user. When the user need use the finger ring sword, can take off the finger ring sword from the finger, then exert an external force for toggle switch with the hand and promote toggle switch, make the blade stretch out the opening, the finger is pressed toggle switch and is carried out relevant tailorring, finishes when tailorring, loosens the finger of pressing toggle switch, removes the external force of effect on toggle switch, and the blade can be in the automatic casing of withdrawing under canceling release mechanical system's drive, avoids exposing in the external world, and the fish tail is human.

In a possible implementation manner, the housing includes a top plate and a bottom plate which are arranged oppositely, a movable column is arranged on the blade, and one end of the movable column, which is far away from the blade, is slidably mounted on the bottom plate; the reset mechanism comprises a reset spring and a fixed column fixedly arranged on the bottom plate, and the reset spring is fixedly connected to the fixed column and the movable column; when the blade slides towards the opening under the action of the toggle switch, the return spring is stretched.

In the above-mentioned realization process, reset spring respectively with fixed column and the movable column fixed connection on the blade, promote toggle switch when the user, make the blade when the opening part slides, reset spring is elongated promptly, when the blade slides to the opening part promptly, reset spring will produce the pulling force of a back pull to the blade, consequently, loosen when the finger that promotes toggle switch, when external force on toggle switch lift off promptly, reset spring will pull the blade back to in the casing automatically, adopt the spring to realize the reset structure of blade simple, therefore, the carrier wave prepaid electric energy is low in cost.

In a possible implementation manner, the number of the fixed columns is two, the two fixed columns and the movable column are distributed in a triangular manner, and the two fixed columns are arranged on one side of the movable column close to the opening; the reset spring is wound on the movable column, two ends of the reset spring are respectively and fixedly installed on the two fixed columns, the reset spring between the movable column and the two fixed columns is bent to form two bending points, and the two bending points are located on one side, far away from the opening, of the movable column.

In the implementation process, the reset spring is bent between the movable column and each fixed column to form a bending point, the movable column is located between the bending point and the corresponding fixed column, when the blade moves towards the opening, the movable column moves towards the direction of the fixed column, the reset spring is elongated, and the two bending points are close to each other. Compare and directly lean on the reset that prolongs of reset spring realized the blade, form the bending point with reset spring bending type, the relative displacement of two bending points can offset partly reset spring's elongation, realizes the restoration to the blade through reset spring's elongation and angle change, can prolong reset spring's life.

In a possible implementation manner, a sliding groove is formed in a top plate of the shell, the toggle switch comprises an upper push plate and a connecting nail, one end of the connecting nail is fixedly installed on the lower surface of the upper push plate, and the other end of the connecting nail penetrates through the sliding groove and is fixedly installed on the blade.

In the above-mentioned realization process, toggle switch sets up on the roof of casing, and toggle switch includes the push pedal and connects the nail, and the push pedal can drive the blade and slide simple structure, and easy realization through connecting nail and blade fixed connection when promoting the push pedal.

In a possible implementation manner, the movable column is provided with a mounting hole, and the connecting nail penetrates through the blade and extends into the mounting hole in the movable column to be detachably mounted with the movable column.

In the implementation process, the blade is generally of a thin-sheet structure, the connecting nail is directly and fixedly connected with the blade, and the connection stability is poor. The connecting nail is connected with the movable column on the blade, so that the acting surface of the connecting nail and the blade can be increased, and the connecting stability is improved. In addition, the connecting nail and the movable column are detachably mounted through the mounting hole, so that the toggle switch can be detached from the shell, and subsequent maintenance is facilitated.

In one possible implementation, the top plate is detachably mounted to the bottom plate.

In the implementation process, the top plate and the bottom plate are detachably mounted, so that the telescopic cutter can be conveniently maintained subsequently.

In a possible implementation manner, the housing further includes a side plate disposed between the top plate and the bottom plate, a blade groove is disposed on an inner wall of the side plate, and the blade is mounted in the blade groove and can slide along the blade groove.

In the implementation process, the blade is arranged in the side plate to realize the sliding installation of the blade in the shell, and the structure is simple.

In a possible implementation manner, a plurality of protruding strips arranged in sequence are arranged on the upper surface of the upper pushing plate, and the length extending direction of the protruding strips is perpendicular to the sliding direction of the blade.

In the implementation process, the plurality of protruding strips are arranged on the upper surface of the push plate, so that the friction force of the push plate can be increased, and a user can push the push plate conveniently.

In one possible implementation, the ring is adjustable in size.

In the implementation process, the ring is set to be of a structure with adjustable size, so that the finger ring knife can be suitable for a plurality of users with different finger thicknesses, can also be suitable for different fingers of one user, and expands the application range of the finger ring knife.

In a possible implementation, the ring includes and indicates the clitellum, adjusts shell and adjusting screw, it includes free end and stiff end to indicate the clitellum, stiff end fixed mounting be in adjusting the shell, it is provided with horizontal screw thread to indicate the part that the clitellum is close to the free end, the free end accessible the screw rod with the cooperation of horizontal screw thread is removed in adjusting the shell.

In the implementation process, the structure of the ring adopts the principle that the throat hoop adjusts the size, the ring is arranged into three structural modules, namely the ring belt, the adjusting shell and the adjusting screw rod, the fixed end of the ring belt is fixedly connected to the adjusting shell, the free end of the ring belt stretches into the shell, the thread on the adjusting screw rod can be matched with the transverse thread on the ring belt, and the adjusting screw rod is rotated to enable the free end to move in the shell, so that the size of the ring can be adjusted.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and that those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.

FIG. 1 is a block diagram of a ring knife provided in accordance with an embodiment of the present application;

FIG. 2 is an exploded view of a ring knife according to an embodiment of the present application;

FIG. 3 is a top view of a base plate with a blade not extending through an opening according to an embodiment of the present application;

FIG. 4 is a top view of a base plate with a blade extending through an opening according to an embodiment of the present application;

FIG. 5 is a schematic diagram of a fit between an adjusting screw and a ring band provided in an embodiment of the present application;

FIG. 6 is a schematic view of an embodiment of the present disclosure illustrating the installation of a finger ring belt and a bottom bracket;

fig. 7 is a structural diagram of a bottom bracket provided in an embodiment of the present application.

Icon: 100-ring; 200-a telescopic cutter; 210-a housing; 220-a blade; 211-an opening; 300-a toggle switch; 400-a reset mechanism; 212-a top plate; 213-a base plate; 221-a movable column; 410-a return spring; 420-fixed column; 411-bending point; 214-a sliding groove; 310-push up board; 320-connecting nails; 215-side plate; 216-an insert pocket; 311-raised bars; 110-ring belt; 120-a conditioning shell; 130-adjusting screw; 111-free end; 112-a fixed end; 113-transverse threads; 121-upper supporting cover; 122-a bottom pallet; 123-screw; 124-mounting a projection; 217-mounting posts; 218-mounting holes; 219-mounting rod; 222-active slot.

Detailed Description

The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Meanwhile, in the description of the present application, the terms "first", "second", and the like are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance.

Referring to fig. 1 and 2, fig. 1 is a structural diagram of a ring knife provided in an embodiment of the present application, and fig. 2 is an exploded structural diagram of a ring knife provided in an embodiment of the present application, the embodiment of the present application provides a ring knife, the ring knife includes a ring 100, a telescopic knife 200, a toggle switch 300 and a reset mechanism 400, the telescopic knife 200 includes a shell 210 and a blade 220 disposed in the shell 210, the shell 210 is fixedly mounted on the ring 100, the shell 210 is provided with an opening 211, and the blade 220 is slidably mounted in the shell 210; the toggle switch 300 is slidably mounted on the housing 210 and is used for pushing the movable blade 220 out of the opening 211 under the action of external force; the reset mechanism 400 is disposed in the housing 210 for driving the blade 220 to be automatically retracted into the housing 210 when the external force on the toggle switch 300 is removed.

In the implementation process, the telescopic cutter 200 is arranged on the ring 100, when the finger ring is not used, a user can arrange the ring cutter sleeve on a finger through the ring 100, the finger ring can be found at any time when the finger ring is needed to be used by the user, the time for searching for the cutter is saved, and the cutter can be prevented from being lost. When the ring knife is worn on the finger of the user, the retractable knife 200 on the ring 100 can be rotated to the back of the hand direction, so that the retractable knife 200 does not influence the user to perform other operations. When the user needs to use the finger ring knife, the finger ring knife can be taken down from the finger, then an external force is applied to the toggle switch 300 by hand to push the toggle switch 300, the blade 220 is made to extend out of the opening 211, the finger presses the toggle switch 300 to perform related cutting, after the cutting is finished, the finger pressing the toggle switch 300 is loosened, the external force acting on the toggle switch 300 is removed, the blade 220 can be automatically retracted into the shell 210 under the driving of the reset mechanism 400, and the exposure to the outside and the scratching of a human body are avoided.

In a possible implementation manner, the housing 210 includes a top plate 212 and a bottom plate 213 disposed opposite to each other, the blade 220 is provided with a movable post 221, and one end of the movable post 221 away from the blade 220 is slidably mounted on the bottom plate 213; the reset mechanism 400 comprises a reset spring 410 and a fixed column 420 fixedly arranged on the bottom plate 213, wherein the reset spring 410 is fixedly connected with the fixed column 420 and the movable column 221; when the blade 220 slides toward the opening 211 under the action of the toggle switch 300, the return spring 410 is elongated.

In the implementation process, the return spring 410 is respectively fixedly connected with the fixed column 420 and the movable column 221 on the blade 220, when the user pushes the toggle switch 300 to make the blade 220 slide towards the opening 211, the return spring 410 is elongated, that is, when the blade 220 slides towards the opening 211, the return spring 410 generates a pulling force pulling the blade 220 backwards, therefore, when the finger pushing the toggle switch 300 is released, that is, the external force on the toggle switch 300 is removed, the return spring 410 automatically pulls the blade 220 back into the housing 210, and the return structure of the blade 220 is simple and the cost is low by adopting the spring.

Specifically, the bottom plate 213 has a movable slot 222, and the movable column 221 is slidably mounted on the bottom plate 213 through the movable slot 222.

In one possible implementation, the fixed post 420 is disposed on a side of the movable post 221 away from the opening 211, one end of the return spring 410 is fixedly connected to the fixed post 420, and the other end is fixedly connected to the movable post 221, and when the blade 220 does not extend out of the opening 211, the return spring 410 is in a natural length state or in an elongated state. When the blade 220 does not extend out of the opening 211, the return spring 410 is in a natural length state, so that the return spring 410 is prevented from being in an elongated state for a long time, and the service life of the return spring can be prolonged. When the blade 220 does not extend out of the opening 211, the return spring 410 is in an elongated state, so that the return spring 410 always has a pulling force on the blade 220, and the blade 220 can be always retracted into the housing 210.

In a possible implementation manner, please refer to fig. 3 and 4, fig. 3 is a top view of the bottom plate when the blade does not extend out of the opening 211 according to an embodiment of the present application, fig. 4 is a top view of the bottom plate when the blade extends out of the opening 211 according to an embodiment of the present application, the number of the fixed columns 420 is two, the two fixed columns 420 and the movable column 221 are distributed in a triangular manner, and the two fixed columns 420 are disposed on one side of the movable column 221 close to the opening 211; the return spring 410 is wound on the movable column 221, two ends of the return spring 410 are respectively and fixedly mounted on the two fixed columns 420, the return spring 410 between the movable column 221 and the two fixed columns 420 is bent to form two bending points 411, and the two bending points 411 are located on one side of the movable column 221 far away from the opening 211.

In the implementation process, the return spring 410 is bent between the movable post 221 and each fixed post 420 to form a bending point 411, the movable post 221 is located between the bending point 411 and the corresponding fixed post 420, when the blade 220 moves to the opening 211, the movable post 221 moves towards the fixed post 420, the return spring 410 is elongated, and the two bending points 411 are close to each other. Compared with the direct elongation of the return spring 410, the return spring 410 is bent to form the bending point 411, the relative displacement of the two bending points 411 can offset the elongation of a part of the return spring 410, the return of the blade 220 is realized through the elongation and the angle change of the return spring 410, and the service life of the return spring 410 can be prolonged.

In a possible implementation manner, the top plate 212 of the housing 210 has a sliding slot 214, the toggle switch 300 includes a push-up plate 310 and a connecting pin 320, one end of the connecting pin 320 is fixedly mounted on the lower surface of the push-up plate 310, and the other end of the connecting pin passes through the sliding slot 214 and is fixedly mounted on the blade 220.

In the above implementation process, the toggle switch 300 is disposed on the top plate 212 of the housing 210, the toggle switch 300 includes the top plate 310 and the connecting nail 320, the top plate 310 is fixedly connected to the blade 220 through the connecting nail 320, and the blade 220 can be driven to slide when the top plate 310 is pushed, so that the toggle switch is simple in structure and easy to implement.

In a possible implementation manner, the movable column 221 is provided with a mounting hole 218, and the connecting nail 320 passes through the blade 220 and extends into the mounting hole 218 of the movable column 221 to be detachably mounted with the movable column 221.

In the above implementation process, the blade 220 is generally in a thin-plate structure, and the connecting nail 320 is directly and fixedly connected with the blade 220, and the connection stability is poor. The connecting nail 320 is connected with the movable column 221 on the blade 220, so that the acting surfaces of the connecting nail 320 and the blade 220 can be increased, and the connecting stability is improved. In addition, the connecting pin 320 and the movable column 221 are detachably mounted through the mounting hole 218, so that the toggle switch 300 can be detached from the housing 210, thereby facilitating subsequent maintenance.

In one possible implementation, the top plate 212 is removably mounted to the bottom plate 213.

In the implementation process, the top plate 212 and the bottom plate 213 are detachably mounted, so that the telescopic cutter 200 can be conveniently maintained subsequently.

Specifically, a plurality of mounting posts 217 may be disposed on the bottom plate 213, each mounting post 217 has a mounting hole 218, a plurality of mounting rods 219 are correspondingly disposed on the top plate 212, and the mounting rods 219 may be inserted into the mounting holes 218 to detachably mount the bottom plate 213 and the top plate 212.

In one possible implementation, the housing 210 further includes a side plate 215 disposed between the top plate 212 and the bottom plate 213, a blade slot 216 is disposed on an inner wall of the side plate 215, and the blade 220 is mounted in the blade slot 216 and can slide along the blade slot 216.

In the implementation process, the blade slots 216 are arranged on the side plates 215 to realize the sliding installation of the blades 220 in the shell 210, and the structure is simple. Specifically, the blade grooves 216 are located at two sides of the blade 220, and the width of the blade grooves 216 is equal to the thickness of the blade 220, so that the blade 220 can be prevented from moving up and down in the blade grooves 216, the stability of the blade 220 is maintained, and the safety of the blade 220 in use is improved.

In one possible implementation manner, the upper surface of the upper push plate 310 is provided with a plurality of protruding bars 311 arranged in sequence, and the length extension direction of the protruding bars 311 is perpendicular to the sliding direction of the blade 220.

In the implementation process, the plurality of protruding strips 311 are arranged on the upper surface of the push-up plate 310, so that the friction force of the push-up plate 310 can be increased, and a user can push the push-up plate 310 conveniently.

In one possible implementation, the ring 100 is adjustable in size.

In the implementation process, the ring 100 is set to be of a size-adjustable structure, so that the finger ring knife can be suitable for a plurality of users with different finger thicknesses, can also be suitable for different fingers of one user, and the application range of the finger ring knife is expanded.

In a possible implementation manner, please refer to fig. 1, fig. 2, fig. 5, fig. 6 and fig. 7, fig. 1 is a structural diagram of a ring knife provided in an embodiment of the present application, fig. 2 is an exploded structural diagram of a ring knife provided in an embodiment of the present application, fig. 5 is a schematic diagram of a fit between an adjusting screw and a ring band provided in an embodiment of the present application, the ring 100 includes a ring band 110, an adjusting shell 120 and an adjusting screw 130, the ring band 110 includes a free end 111 and a fixed end 112, the fixed end 112 is fixedly installed in the adjusting shell 120, a portion of the ring band 110 near the free end 111 is provided with a transverse thread 113, and the free end 111 can move in the adjusting shell 120 through the fit of the screw and the transverse thread 113.

In the implementation process, the structure of the ring 100 adopts the principle that the throat hoop adjusts the size, the ring 100 is set into three structural modules, namely a ring belt 110, an adjusting shell 120 and an adjusting screw 130, the fixed end 112 of the ring belt 110 is fixedly connected to the adjusting shell 120, the free end 111 extends into the shell 210, the thread on the adjusting screw 130 can be matched with the transverse thread 113 on the ring belt 110, and the free end 111 can move in the shell 210 by rotating the adjusting screw 130, so that the size of the ring 100 can be adjusted.

Specifically, the adjusting shell 120 includes an upper supporting cover 121 and a bottom plate 122, the bottom plate 122 can be fixedly connected to the upper supporting cover 121 through a screw 123, the fixed end 112 of the finger ring belt 110 is fixed to the bottom plate 122, and the bottom plate 213 of the telescopic housing 210 is fixedly mounted to the upper supporting cover 121.

Optionally, the bottom bracket plate 122 is provided with an installation protrusion 124, the fixed end 112 of the finger ring belt 110 is provided with an installation clamping groove, and the installation protrusion 124 and the installation clamping groove are clamped in a matching manner to realize the fixed connection between the fixed end 112 and the bottom bracket plate 122.

In some embodiments, the ring belt 110 has a plurality of transverse threads 113 disposed thereon, and the plurality of transverse threads 113 are distributed throughout the ring belt 110. The transverse thread 113 is a transverse threaded hole formed in the finger ring band 110, and when the transverse threaded hole is distributed over the entire finger ring band 110, the transverse threaded hole can be used as a mounting slot to be mounted in cooperation with the mounting protrusion 124.

The above description is only an example of the present application and is not intended to limit the scope of the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

Claims

1. A ring knife, comprising:

a ring;

the telescopic cutter comprises a shell and a blade arranged in the shell, the shell is fixedly arranged on the ring, an opening is formed in the shell, and the blade is slidably arranged in the shell;

the toggle switch is slidably arranged on the shell and used for pushing the blade to extend out of the opening under the action of external force;

the reset mechanism is arranged in the shell and used for driving the blade to automatically retract into the shell when the external force on the toggle switch disappears.

2. The ring knife of claim 1, wherein the housing includes a top plate and a bottom plate disposed opposite each other, the blade having a movable post disposed thereon, the movable post having an end distal from the blade slidably mounted on the bottom plate;

the reset mechanism comprises a reset spring and a fixed column fixedly arranged on the bottom plate, and the reset spring is fixedly connected to the fixed column and the movable column; when the blade slides towards the opening under the action of the toggle switch, the return spring is stretched.

3. The ring knife according to claim 2, wherein the number of the fixed posts is two, the two fixed posts and the movable post are distributed in a triangular manner, and the two fixed posts are arranged on one side of the movable post close to the opening;

the reset spring is wound on the movable column, two ends of the reset spring are respectively and fixedly installed on the two fixed columns, the reset spring between the movable column and the two fixed columns is bent to form two bending points, and the two bending points are located on one side, far away from the opening, of the movable column.

4. The ring knife according to claim 3, wherein a sliding groove is formed on a top plate of the shell, the toggle switch comprises an upper push plate and a connecting nail, one end of the connecting nail is fixedly arranged on the lower surface of the upper push plate, and the other end of the connecting nail penetrates through the sliding groove and is fixedly arranged on the blade.

5. The ring knife of claim 4, wherein the movable post is provided with a mounting hole, and the connecting nail passes through the blade and extends into the mounting hole of the movable post to be detachably mounted with the movable post.

6. The ring knife of claim 5, wherein the top plate is removably mounted to the bottom plate.

7. The ring knife of claim 3, wherein the housing further comprises a side plate disposed between the top plate and the bottom plate, the side plate having an inner wall with a blade slot therein, the blade being mounted in the blade slot and slidable along the blade slot.

8. The ring knife of claim 4, wherein the upper surface of the push-up plate is provided with a plurality of protruding strips arranged in sequence, and the length extension direction of the protruding strips is perpendicular to the sliding direction of the blade.

9. The ring knife of any one of claims 1-8, wherein the ring is adjustable in size.

10. The ring knife of claim 9, wherein the ring includes a ring band, an adjustment housing, and an adjustment screw, the ring band including a free end and a fixed end, the fixed end being fixedly mounted within the adjustment housing, a portion of the ring band adjacent the free end being provided with a transverse thread, the free end being movable within the adjustment housing by engagement of the screw with the transverse thread.