Apparatus for connecting implements to a Tractor

Abstract

The present invention relates to a work implement connecting device for a tractor, and more specifically, to a work implement connecting device for a tractor that allows for easy attachment and detachment even if the spacing between the upper link and the lower link of the work implements connected to the tractor by a three-point link is different. To this end, the present invention comprises a work implement connecting device comprising: a frame connected to a three-point link of a tractor; an upper connecting part installed on the upper part of the frame and connected to an upper link pin of a three-point link of a work implement; and lower connecting parts installed on each lower side of the frame and connected to a lower link pin of a three-point link of a work implement. The upper connecting part comprises: a fixed body fixed to the upper part of the frame; a lifting / lowering part that moves up and down in the vertical direction from the fixed body; an upper hook part provided in the lifting / lowering part for hooking the upper link pin of the working machine; and an elastic body that elastically supports the lifting / lowering part in the vertical direction.

Description

Technology Field

[0001] The present invention relates to a work implement connecting device for a tractor, and more specifically, to a work implement connecting device for a tractor that allows for easy attachment and detachment even if the spacing between the upper and lower links of the work implements connected to the tractor by a three-point link is different from each other or the spacing between a pair of lower links is different. Background Technology

[0003] Generally, implements connected to the rear of a tractor include plows, harrows, rotary tillers, and ridge tillers, and these are towed by the tractor or powered through the tractor's PTO shaft to perform work.

[0004] To connect these implements to the tractor, a three-point linkage system is used, that is, the upper link and the lower link are connected so that they can be detachably connected to each other, and work is performed by traction or power transmission.

[0005] In order to connect a work implement suitable for the intended use to the tractor, the previously attached work implement must be detached and replaced with a new work implement. To enable quick and easy connection of such work implements, a separate work implement connecting device is installed on the 3-point linkage, allowing the work implement to be easily attached and detached using this work implement connecting device.

[0006] As an example of such a work implement connecting device, in Public Patent No. 10-2009-0113923 (automatic work implement connecting device for a tractor), as shown in FIG. 1, the connecting device (10) is configured such that an upper connecting part (12) in the form of a hook, which is connected and fixed to the upper link (TL) of the tractor, is installed at the upper center of a square frame (11), and lower connecting parts (13, 14) in the form of hooks, which are connected and fixed to the lower link (LL) of the tractor, are respectively installed on both lower sides.

[0007] Accordingly, as shown in FIG. 2, the connecting device (10) moves by power generated from the tractor, and the upper connecting part (12) and lower connecting part (13, 14) in the form of a hook move from the lower side to the upper side of the upper link pin (21) and lower link pin (22) having the form of a connecting pin provided in the link connecting part (20) of the work device (30), thereby forming a mutual link connection, so that the work device (30) is towed by the power of the tractor or stable power transmission is achieved so that work is performed.

[0008] That is, when attaching or detaching the work implement (30), the upper link (TL) and lower link (LL), which are three-point links of the tractor, are not individually connected and fixed to the upper link pin (21) and lower link pin (22) of the work implement (30) which is a three-point link; instead, the upper connecting part (12) and lower connecting part (13, 14), which are in the form of hooks installed on the frame (11) of the connecting device (10), can be simply and conveniently connected by simply hooking them to the link connecting part (20) of the work implement (30) which has the upper link pin (21) and lower link pin (22).

[0010] However, although this conventional technology allows the connecting device (10) to be simply and easily connected to the link connecting part (20), which is a three-point link of the working machine (30), if the spacing between the upper link pin (21) and the lower link pin (22) differs depending on the type of working machine, a connecting device (10) suitable for that must be separately provided and connected, and if the spacing between a pair of lower link pins (22) differs from each other, a connecting device suitable for that must be provided individually, so there is a problem that it is not advantageous in terms of cost.

[0012] <Prior Art Literature>

[0013] 1. Republic of Korea Published Patent No. 10-2009-0113923

[0014] (Automatic implement linkage device for tractors) The problem to be solved

[0016] The purpose of the present invention is to provide a tractor implement connecting device that enables connection to the implement's link connecting part by adjusting the gap between the upper connecting part and the lower connecting part, and the gap between the lower connecting part and the lower connecting part, accordingly, even if the gap between the upper link pin and the lower link pin and the gap between the lower link pin and the lower link pin of the implement's link connecting part change by means of a single connecting device. means of solving the problem

[0018] A tractor implement connecting device according to the present invention for achieving the above-mentioned purpose is,

[0019] A work implement connecting device comprising: a frame connected to a three-point link of a tractor; an upper connecting part installed on the upper part of the frame and connected to an upper link pin of a three-point link of a work implement; and lower connecting parts installed on each lower side of the frame and connected to a lower link pin of a three-point link of a work implement.

[0020] The above upper connecting part

[0021] A fixed body fixed to the upper part of the above frame;

[0022] A lifting / lowering part that moves up and down in the vertical direction from the above fixed body;

[0023] An upper hook portion provided in the above lifting / lowering part for hooking the upper link pin of the above working machine

[0024] It is characterized by being composed of an elastic body that elastically supports the above-mentioned lifting / lowering part in the vertical direction.

[0026] In addition, the fixed body is formed as a tubular body and is fixed in the vertical direction at the upper part of the frame, and the elastic body is located on the lower inner side of the fixed body; the lifting / lowering part is inserted into the fixed body and is configured to be elastically supported in the vertical direction by the elastic body, and furthermore, an elongated hole is formed in the vertical direction on the side of the fixed body, and a guide pin inserted into the elongated hole is provided on the side of the lifting / lowering part to limit the lifting / lowering distance of the lifting / lowering part.

[0028] In addition, the above frame is

[0029] Fixed frame;

[0030] A gearbox mounted on the above fixed frame and generating rotational power manually;

[0031] A pair of movable frames installed to be movable outwardly from both sides of the fixed frame, each having the lower connecting part provided on its lower side;

[0032] It is characterized by being composed of a pair of screw shafts connected to the rotation shaft of the gearbox and inserted into the inner side of each movable frame to be screw-coupled with the movable frame. Effects of the invention

[0034] The present invention has the advantage of excellent workability because it enables immediate connection without the need for separate spacing adjustment work, even if the gap between the upper link pin and the lower link pin of the link connection part of the working machine changes due to a single connecting device.

[0035] In addition, by manually adjusting the width of the connecting device through a simple structure, it can be easily adjusted to match the gap between the lower link pins of the link connection part of the working machine. This eliminates the need for separate external power and offers excellent workability due to its simple structure, as well as significant advantages in terms of cost. Brief explanation of the drawing

[0037] FIGS. 1 and 2 are drawings for explaining the structure and operation of an automatic connecting device for a tractor implement according to the prior art. FIG. 3 is a diagram showing the structure of a tractor implement connecting device according to the present invention. FIG. 4 is a diagram for explaining the cross-sectional structure of the upper connecting part of FIG. 3 and its operational relationship. FIG. 5 is a figure showing another example of an upper connection part. FIG. 6 is a cross-sectional view showing a structure in which the width of the frame is varied by manual operation. FIG. 7 is a cross-sectional view showing the structure of another embodiment in which the width of the frame is varied by manual adjustment. Specific details for implementing the invention

[0038] The aforementioned objectives, features, and advantages will be described in detail below with reference to the attached drawings, and accordingly, a person skilled in the art to which the present invention pertains will be able to easily implement the technical concept of the present invention.

[0039] In describing the present invention, detailed descriptions of known technologies related to the present invention are omitted if it is determined that such descriptions could unnecessarily obscure the essence of the invention.

[0040] The terms used in this invention have been selected to be as widely used as possible, taking into account their functions in the invention; however, these may vary depending on the intent of those skilled in the art, case law, the emergence of new technologies, etc.

[0041] In addition, in specific cases, there are terms arbitrarily selected by the applicant, and in such cases, their meanings will be described in detail in the description of the relevant invention.

[0042] Therefore, the terms used in this invention should be defined not merely by their names, but based on their meanings and the overall content of the invention.

[0044] Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings.

[0045] However, the embodiments of the present invention exemplified below may be modified in various other forms, and the scope of the present invention is not limited to the embodiments described below.

[0046] The embodiments of the present invention are provided to more fully explain the invention to those skilled in the art.

[0048] FIG. 3 is a diagram showing the structure of a work implement connecting device for a tractor according to the present invention, and is largely composed of a frame (100), a pair of lower connecting parts (160, 170), and an upper connecting part (200).

[0049] The above frame (100) can be formed in various shapes, such as a square frame or a triangular frame, and in the present invention, it is described as an example of a frame having a '┏┓' shape with the upper portion extended horizontally.

[0050] At the rear of the horizontal upper central portion of the frame (100), an upper connecting pin (140) is provided for connecting the upper link of the tractor's three-point linkage, and at the front, a fixing part (180, 190) is installed to connect and fix the upper connecting part (200).

[0051] The above-mentioned fixed parts (180, 190) are formed in the shape of a pair of plate materials and are fixed to the front portion of the frame (100) so as to be erected vertically with a gap between them, and the gap is such that it can perfectly accommodate the width of the upper connecting part (200).

[0052] Additionally, fastening holes (180, 191) are formed at regular intervals in the vertical direction in the fixed portion (180, 190), thereby allowing the vertical height at which the upper connecting portion (200) is fixed to be adjusted. That is, a connecting portion (220) inserted between the fixed portions (180, 190) is provided on the rear portion of the upper connecting portion (200), and a plurality of fixing holes (221) are formed in the vertical direction in the connecting portion (220), so that the upper connecting portion (200) is fixed to the fixed portion (180, 190) by fastening a pin to the fastening hole (181) and the fixing hole (221) at a determined height.

[0053] From the horizontal portion of the above frame (100), the two side portions are extended downward, and a plurality of fastening holes (121) are formed at a constant interval in the vertical direction on the lower side of the extended portion, and lower connecting parts (160, 170) are each fixedly installed at the location where the fastening holes (121) are formed.

[0054] The lower connecting part (160, 170) is formed in the shape of a square ring and is provided with a body (161) that inserts the portion extending downward into the inner side, and fixing holes (161) are formed on both sides of the body (161) in the vertical direction so that they are fastened to the fastening hole (121), thereby allowing the height of the lower connecting part (160, 170) to be adjusted.

[0055] In addition, the rear portion of the body (161) is provided with lower connecting pins (163, 173) to which the lower links of the tractor's three-point linkage are each connected, and the front portion is provided with hook-shaped lower hooks (164, 174) to which the lower link pins of the implement are connected.

[0056] The upper connecting part (200) is connected to the upper link pin of the work machine and elastically supports the upper link pin in the vertical direction, so that even if the gap between the upper link pin and the lower link pin of the work machine changes, it has a structure that automatically adapts to the gap and enables connection.

[0057] To this end, the upper connecting part (200) is a tubular body with a closed lower end, and the connecting part (220) is formed on the rear portion, and a fixing body (210) is provided that is fixed to the fixing part (180, 190) of the frame (100) through the connecting part.

[0058] Although it is depicted in the drawing as a square pipe, it can be configured in the form of a circular pipe or a polygonal pipe.

[0059] As shown in FIG. 4, an elastic body (250) in the form of a coil spring is inserted into the inner side of the fixed body (210), and a lifting / lowering part (240) in the form of a square rod or pipe is inserted into the upper side of the fixed body (210) and is elastically supported in the up and down direction by the elastic body (250).

[0060] At this time, an elongated hole (230) is formed in the vertical direction on both sides of the fixed body (210), and a guide pin (242) is formed protrudingly on the side of the lifting / lowering part (240) and inserted into the elongated hole (230), thereby preventing the lifting / lowering part (240) from moving upward while limiting the vertical lifting / lowering distance.

[0061] Additionally, a bolt (160) is inserted from the lower side of the fixed body (210), and the bolt (160) is fastened to a nut (262) fixed to the fixed body (210). A support plate (261) is provided on the bottom portion of the fixed body (210) to contact and support the lower side of the elastic body (250), and the upper portion of the bolt (160) is in contact with the bottom surface of the support plate (261), thereby allowing the elastic force of the elastic body (250) to be adjusted.

[0062] That is, when the bolt (160) is rotated to insert the lifting / lowering part (240) into the inside of the fixed body (210) while the vertical movement distance of the lifting / lowering part (240) is limited by the elongated hole (230) and the guide pin (242), the elastic body (250) is compressed and the elastic force increases. Conversely, when the bolt (160) is rotated to withdraw it, the elastic force decreases, and this elastic force can be appropriately adjusted according to the weight of the working machine.

[0063] On the upper side of the front portion of the above-mentioned lifting / lowering part (240), a hook-shaped upper hook portion (241) is formed to be connected to the upper link pin of the work device.

[0065] Accordingly, as shown in FIG. 4(a), the frame (100) connected to the three-point link of the tractor is moved by the power of the tractor so that the upper hook part (241) and the lower hook part (164, 174) are positioned below the upper link pin (310) and the lower link pin (320) provided in the link connection part of the implement (300), respectively, and then the frame (100) is moved upward, so that the upper hook part (241) first hooks the upper link pin (310).

[0066] Subsequently, when the frame (100) is continuously raised, as shown in Fig. 4(b), the lifting / lowering part (240), which is elastically supported by the elastic body (250) by the load of the workpiece (300), is inserted into the inside of the fixed body (210), and the lower hook part (164, 174) is caught by the lower link pin (320), thereby connecting and fixing the workpiece (300) to the connecting device of the present invention which is connected to the three-point link of the tractor.

[0067] In this structure, even if the gap between the upper link pin (310) and the lower link pin (320) of the work device (300), i.e., the vertical distance, changes, the upper / lowering part (240) is inserted into the fixed body (210) by the weight of the work device (300), and the upper hook part (241) and the upper link pin (310), and the lower hook part (164, 174) and the lower link pin (320) are automatically connected and fastened to the gap automatically without separate adjustment.

[0069] FIG. 5 is a diagram showing a different form of the upper connecting part (200), wherein an elongated hole (230) is formed in the lower side portion of the fixed body (210), and a guide pin (242) formed on the side of the lifting / lowering part (240) is inserted therein, and an elastic body (250) in the form of a coil spring is installed on the outside of the fixed body (210), wherein the upper portion of the elastic body (250) is fixed to the outside of the fixed body (210) and the lower portion is fixed to the guide pin (242), thereby elastically supporting the lifting / lowering part (240).

[0070] In addition, a 'U'-shaped insertion groove (211) is formed from the top of the front portion of the fixed body (210) to avoid interference with the upper hook portion (241) when the lifting / lowering portion (240) is lowered, and although not shown in the drawing, the structure of the connecting portion (220) can be provided to fix it to the frame (100) by adjusting the height.

[0072] Meanwhile, the above-mentioned frame (100) is configured so that its width can be easily adjusted manually, and for this purpose, a fixed frame (110) and a movable frame (120, 130) are provided.

[0073] The fixed frame (110) is formed as a tubular body, and movable frames (120, 130) are each installed on both sides of the fixed frame (110) so as to be movable outwardly. Each of these movable frames (120, 130) is extended downward, and a lower connecting part (160, 170) is installed on the extended part.

[0074] The above-mentioned moving frames (120, 130) are each shaped like a '┓' and a '┏' respectively, and are formed into tubular shapes, with one side, that is, the part not extended downward, being inserted into the inside of the above-mentioned fixed frame (110) so that they can move in the left and right outward directions.

[0075] A gearbox (150) is provided in the central part of the fixed frame (110), and a handle (151) is provided on the outside so that a worker can apply power by hand. Inside the gearbox (150), a gear section (151) with a bevel gear engaged is provided as shown in FIG. 6.

[0076] At this time, the gear section (151) may be equipped with various gear meshing methods for power transmission, not just bevel gears.

[0077] Accordingly, the shaft of the handle (151) is mounted on the shaft of the horizontal bevel gear arranged in the horizontal direction, and screw shafts (153-1, 153-2) are coupled on the same axis to each side of the rotation shaft (153) of the vertical bevel gear arranged in the vertical direction and meshing with the horizontal bevel gear, and these screw shafts (153-1, 153-2) have screw threads formed in opposite directions.

[0078] Therefore, a screw shaft (153-1, 153-2) is inserted into the inside of the movable frame (120, 130) and screw-coupled through a nut (154, 155) that is fixedly installed at the end of the movable frame (120, 130) inserted into the inside of the fixed frame (110).

[0079] Accordingly, when the operator rotates the handle (151) in one direction, the screw shaft (153-1, 153-2) rotates through the gear part (151) of the gearbox (150) to extend the movable frame (120, 130) outward by the same length, thereby widening the width of the frame (100). Conversely, when the operator rotates the handle (151) in the other direction, the movable frame (120, 130) is inserted inward by the same length, thereby narrowing the width of the frame (100).

[0080] That is, the fixed frame (110) is connected to the upper link of the tractor and fixed so as not to move left or right, and only the left and right moving frames (120, 130) can move inward and outward by the same length to vary the width.

[0082] FIG. 7 is a cross-sectional view showing the structure of another embodiment in which the width of the frame (100) is manually variable. In this embodiment, the fixed frame (110) is formed as a tubular body, and movable frames (120, 130) are each installed on both sides of the fixed frame (110) so as to be movable outwardly. These movable frames (120, 130) are each extended downward, and a lower connecting part (160, 170) is installed on each of the extended parts.

[0083] The above-mentioned moving frames (120, 130) are each shaped like a '┓' and a '┏' respectively, and are formed into tubular shapes, with one side, that is, the part not extended downward, being inserted into the inside of the above-mentioned fixed frame (110) so that they can move in the left and right outward directions.

[0084] An axial member (270) fixed by an axial support member (271) is provided in the inner central portion of the fixed frame (110), and a first screw shaft (153-3) and a second screw shaft (153-4) in the form of a long bolt are inserted into the movable frame (120, 130) in the longitudinal direction from the outside, with their tip portions rotatably mounted on both sides of the axial member (270), and a nut (156, 157) is fixedly installed at the outer end of each movable frame (120, 130), so that the first screw shaft (153-3) and the second screw shaft (153-4) are screw-coupled with the nut (156, 157).

[0085] At this time, the shaft support member (271) is fixed to the central part of the fixed frame to prevent the shaft member (270) from moving left and right within the fixed frame (110).

[0086] In addition, handles (151-1, 151-2) are installed on the outer ends of the first screw shaft (153-3) and the second screw shaft (153-4) respectively so that a worker can grasp them with their hands and rotate the first screw shaft (153-3) and the second screw shaft (153-4).

[0087] Accordingly, when the operator rotates the handle (151-1), the first screw shaft (153-3) rotates, and the movable frame (120) is pulled out or retracted from the fixed frame (110) according to the direction of rotation, thereby varying the width of one side of the frame (100).

[0088] Likewise, when the operator rotates another handle (151-2), the second screw shaft (153-4) rotates, and the movable frame (130) is withdrawn or retracted from the fixed frame (110) according to the direction of rotation, thereby varying the width of the other side of the frame (100).

[0089] At this time, it is preferable that the screw directions of the first screw shaft (153-3) and the second screw shaft (153-4) be formed in opposite directions, but in some cases, they may be formed in the same direction.

[0090] And, by connecting the central part of the fixed frame (110) located on the bearing (270) to the upper link of the tractor, the left and right width of the frame (100) can be adjusted to the position of the lower link of the implement without changing the position of the upper link.

[0092] In another form, the first screw shaft (153-3) and the second screw shaft (153-4) are not separated but are formed as a single screw shaft and can be installed by penetrating the shaft opening (270). The screw shaft may have screw threads formed in opposite directions on both sides and the screw shaft may be further extended to the outside of the movable frame (120, 130) by being screw-coupled via nuts (156, 157), and the structure may have handles (151-1, 151-2) provided on both ends of the extended screw shaft.

[0093] In addition, a keyway is formed along the circumference of the central portion of the screw shaft, that is, the portion corresponding to the location of the shaft member (270), and a key that is inserted into the keyway is formed in the shaft member (270) and joined together, so that the central portion of the screw shaft rotates in place without moving left or right by the shaft member (270).

[0094] Therefore, when a worker rotates one of the handles (151-1) (151-2), the screw shaft rotates in place, and the screw-coupled movable frames (120, 130) on both sides can be withdrawn or retracted from the fixed frame (110) by the same length.

[0095] In such cases, a handle may be provided on each end of a single screw shaft, or a handle may be provided on only one end.

[0097] As specific parts of the present invention have been described in detail above, it will be apparent to those skilled in the art that such specific descriptions are merely preferred embodiments and do not limit the scope of the present invention.

[0098] Accordingly, the substantial scope of the present invention will be defined by the appended claims and their equivalents. Explanation of the symbols

[0100] 100 : Frame 110 : Fixed frame 120,130 : Move frame 121 : Fastening hole 140 : Upper connecting pin 150 : Gearbox 151,151-1,151-2 : Handle 152 : Gear section 153 : Rotation axis 153-1, 153-2, 153-3, 153-4 : Screw shaft 154,155,156,157 : Nut 160,170 : Lower connection part 161,171 : Body 162,172 : Fixed hole 163,173 : Lower connecting pin 164,174 : Lower hanging part 180, 190 : Fixed part 181,191 : Fastening hole 200 : Upper connecting part 210 : Fixed body 220 : Connection part 221 : Fixing hole 230 : Long hole 240 : Lifting / Lowering Unit 241 : Upper hanging part 242 : Guide pin 250 ; Elastic body 260 : Bolt 261 : Support plate 262 : Nut 270 : Bearing 271 : Bearing support 300 : Work machine 310 : Upper hanging pin 320 : Bottom hanging pin

Claims

Claim 1 A frame connected to a three-point link consisting of an upper link and a pair of lower links of a tractor; an upper connecting part installed on the upper part of the frame and connected to the upper link pin of an implement; A tractor implement connecting device comprising: a pair of lower connecting parts each installed on both lower sides of the frame and connected to a pair of lower link pins of the implement; wherein the pair of lower connecting parts each have a lower hook-shaped lower hook portion that is opened upward and hooks the lower link pins, and the upper connecting part comprises: a fixed body formed as a tubular body with a closed bottom and fixed in the vertical direction to the upper part of the frame; an elastic body in the form of a compression coil spring disposed on the lower inner side of the fixed body; a lifting / lowering part inserted into the interior of the fixed body from the upper side of the fixed body and elastically supported upward by the elastic body to move up and down relative to the fixed body; a hook-shaped upper hook portion provided on the upper front side of the lifting / lowering part and opened upward to hook the upper link pin of the implement; an elongated hole formed vertically on the side of the fixed body; and a part provided on the side of the lifting / lowering part that is inserted into the elongated hole and moves along the elongated hole to allow the upper side of the lifting / lowering part to detach. A guide pin that prevents and limits the up-and-down distance; a support plate that supports the lower side of the elastic body inside the fixed body; and an adjustment bolt that is screw-coupled to the lower side of the fixed body and has its upper end in contact with the bottom surface of the support plate, thereby adjusting the compression amount and elastic force of the elastic body by moving the support plate up and down according to rotation;A tractor implement connecting device comprising, wherein when the frame is raised while the upper hook portion and the lower hook portion are respectively positioned below the upper link pin and the lower link pin, the upper hook portion first engages with the upper link pin, and as the frame continues to rise, the load of the implement is transmitted to the lifting / lowering portion through the upper link pin and the upper hook portion, causing the lifting / lowering portion to descend into the interior of the fixed body while compressing the elastic body, and subsequently, the lower hook portion fixed to the frame engages with the lower link pin. Claim 2 A tractor implement connecting device according to claim 1, wherein a pair of plate-shaped fixing parts spaced apart from each other are installed on the upper front of the frame, and a plurality of fastening holes are formed in each of the pair of fixing parts in the vertical direction, and a connecting part inserted between the pair of fixing parts is provided on the rear of the fixing body, and a plurality of fixing holes are formed in the vertical direction in the connecting part, and the fixing height of the upper connecting part is adjusted by fastening pins to the fastening holes and the fixing holes at a selected height. Claim 3 A tractor implement connecting device according to claim 1, wherein each lower side of the frame is provided with an extension portion extending downward and having a plurality of fastening holes formed in the vertical direction, and each lower connecting portion comprises a ring-shaped body into which the extension portion is inserted and a fixing hole formed in the body, wherein the fixing height of each lower connecting portion is adjusted by fastening a pin to the fastening hole and the fixing hole at a selected height. Claim 4 delete Claim 5 delete Claim 6 A tractor implement connecting device comprising: a frame connected to a three-point link consisting of an upper link and a pair of lower links of a tractor; an upper connecting part installed on the upper part of the frame and connected to an upper link pin of an implement; and a pair of lower connecting parts each installed on both lower sides of the frame and connected to a pair of lower link pins of the implement; wherein the frame comprises: a fixed frame formed as a tubular body; a gearbox mounted on the central part of the fixed frame and having an input shaft connected to a handle rotated by an operator and an output rotating shaft receiving rotational power from the input shaft, and having a pair of bevel gears arranged to mesh with each other between the input shaft and the output rotating shaft; a pair of movable frames each inserted into the interior of both sides of the fixed frame and capable of moving outward and inward directions relative to the center of the fixed frame, each having the lower connecting part on its lower side; and a pair of screw shafts each connected to both sides of the output rotating shaft along the same axis and having screw threads formed in opposite directions. A tractor implement connecting device comprising: a pair of nuts each fixed to the inner ends facing each other of the pair of movable frames and screw-coupled to the corresponding screw shafts; wherein when one handle is rotated, the pair of screw shafts rotate simultaneously through the pair of bevel gears of the gearbox, and the pair of movable frames are configured to be simultaneously withdrawn or retracted by the same distance in opposite directions relative to the center of the fixed frame. Claim 7 A tractor implement connecting device comprising: a frame connected to a three-point link consisting of an upper link and a pair of lower links of a tractor; an upper connecting part installed on the upper part of the frame and connected to an upper link pin of an implement; and a pair of lower connecting parts each installed on both lower sides of the frame and connected to a pair of lower link pins of an implement; wherein the frame comprises: a fixed frame formed as a tubular body; a pair of movable frames each inserted into the interior of both sides of the fixed frame and capable of moving outward and inward relative to the center of the fixed frame, with the lower connecting part provided on each lower side; an axle support part fixed to the inner center of the fixed frame; an axle holder fixed to prevent left-right movement in the inner center of the fixed frame by the axle support part; and a screw shaft formed as a single unseparated shaft that penetrates the fixed frame and the pair of movable frames in the left-right direction, has screw threads formed in opposite directions on both sides, and has a handle provided on the end exposed to one or both sides of the pair of movable frames. A tractor implement connecting device characterized by comprising: a pair of nuts each fixed to the outer ends of the pair of movable frames and each screw-coupled to the corresponding threads of the screw shaft; wherein a keyway is formed along the circumference of the central part of the screw shaft and a key inserted into the keyway is formed in the shaft fitting so that the screw shaft rotates in place while restricting the left-right movement of the screw shaft; and wherein when one of the handles is rotated, the screw shaft rotates in place and the pair of movable frames are simultaneously pulled out or retracted by the same distance in opposite directions relative to the center of the fixed frame. Claim 8 A frame connected to a three-point link consisting of an upper link and a pair of lower links of a tractor; an upper connecting part installed on the upper part of the frame and connected to the upper link pin of an implement; A tractor implement connecting device comprising: a pair of lower connecting parts each installed on both lower sides of the frame and connected to a pair of lower link pins of the implement; wherein the frame comprises: a fixed frame formed as a tubular body; a first movable frame and a second movable frame each inserted into the interior of both sides of the fixed frame and movable in the outward and inward directions relative to the center of the fixed frame, with the lower connecting part each provided on the lower side; an axle support member fixed to the inner center of the fixed frame; an axle mounting member fixed to prevent left-right movement in the inner center of the fixed frame by the axle support member; a first nut and a second nut each fixed to the outer ends of the first movable frame and the second movable frame, respectively; and a first screw shaft inserted from the outer side of the first movable frame into the inner side of the first movable frame and screw-coupled with the first nut, with the inner tip rotatably mounted on one side of the axle mounting member and the outer end having a first handle provided thereon. A tractor implement connecting device characterized by comprising: a second screw shaft inserted from the outer side of the second movable frame into the inner side of the second movable frame and screw-coupled with the second nut, the inner end of which is rotatably mounted on the other side of the shaft fitting, and the outer end having a second handle; wherein the first screw shaft and the second screw shaft are separated from each other and can rotate independently, and when the first handle is rotated, only the first movable frame is withdrawn or stored from the fixed frame, and when the second handle is rotated, only the second movable frame is withdrawn or stored from the fixed frame, so that the widths of both sides of the fixed frame are independently adjusted.

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