Loader attachment / detachment locking device

Abstract

The present invention relates to a loader attachment / detachment locking device for connecting mounting columns of a loader to mounting frames of a tractor, wherein the mounting frames are positioned at both end portions of the tractor, and each mounting column is rotatably coupled to an end of a loader boom in correspondence to the mounting frame on each side. Each of the mounting columns has an outer surface and an inner surface that correspond to each other and are spaced apart from each other, and the mounting frame is positioned between the two corresponding surfaces of the mounting column, which are composed of the outer surface and the inner surface. Holes into which a portion of a locking pin assembly for connecting the mounting frame and the mounting column is inserted are formed to correspond to each other in the two corresponding surfaces of the mounting column and one side of the surface of the mounting frame, and holes into which the other portion of the locking pin assembly for assisting the connection of the mounting frame and the mounting column is inserted are formed to correspond to each other in the two corresponding surfaces of the mounting column and the other side of the surface of the mounting frame.

Description

Loader detachable locking device

[0001] The present invention relates to a locking device for attaching and detaching a loader, and more specifically, to a locking device for attaching and detaching a loader that allows the loader to be easily attached and detached from a tractor.

[0002] Generally, agricultural machinery such as tractors can perform work by connecting various types of implements depending on the purpose of use. The tractor has an arm configuration referred to as a 'loader' at the rear or front, and can be used by connecting a work means such as the bucket (21) of FIG. 1a to the end of the loader (20).

[0003] Conventionally, when connecting a loader (20) to a tractor (10), the pin insertion hole (23a) formed in the connecting bracket (23) of the loader (20) and the pin insertion hole (not shown) formed in the coupling frame (11) of the tractor were aligned, and then a connecting pin (25) was inserted to connect the loader (20) to the tractor (10). In this case, as shown in FIG. 1b, the connecting pin (25) passes through the pin insertion holes (23a) (not shown), and then a locking ring (26) is fitted to the end (25a) exposed on the opposite side so that the connecting pin (25) is restrained.

[0004] Meanwhile, when separating the loader (20) and the tractor (10), the connecting pin (25) had to be removed from the pin insertion hole (23a) and stored separately, so there was a risk of loss. Therefore, as a solution to this, the "loader assembly for a tractor having a detachable pin" of Korean Registered Patent Publication No. 10-2708254 was developed.

[0005] The above patent No. 10-2708254 is a loader assembly that is detachably attached to a coupling frame (11) of a tractor (10), and comprises a bracket (140) that is detachably coupled to the coupling frame (11) in which an internal pin insertion hole (15) is formed through, and in which an external first pin insertion hole (141a) and an internal first pin insertion hole (141a') are formed facing each other, corresponding to the internal pin insertion hole (15); The bracket (140) is configured with a detachable pin (150) that penetrates the inner pin insertion hole (15) through the outer first pin insertion hole (141a) of the bracket (140) and is inserted into the inner first pin insertion hole (141a'), or protrudes outward from the bracket (140) and is separated from the inner first pin insertion hole (141a') and the inner pin insertion hole (15). The detachable pin (150) comprises: a frame coupling pin (151) that is detachably coupled to the inner pin insertion hole (15) and the inner first pin insertion hole (141a') through the outer first pin insertion hole (141a); and a bracket fixing pin (153) that is inserted into the second pin insertion hole (141b) and fixedly coupled to the bracket (140). The invention provides a configuration including a pin support elastic member (160) that is coupled between the bottom plate (143) of the bracket (140) and the end of the bracket fixing pin (153) to elastically support the insertion or separation of the detachable pin (150), wherein the upper end (161) of the pin support elastic member (160) is formed to extend vertically upward and is fitted into the upper elastic member insertion hole (153a) of the bracket fixing pin (153), and the lower end (163) of the pin support elastic member (160) is formed to extend vertically downward and is fitted into the lower elastic member insertion hole (143a) of the bottom plate (143).

[0006] With this configuration, the loader assembly of Patent No. 10-2708254 is inserted into or separated from the coupling frame while maintaining a connected state without the detachable pin being separated from the bracket, and since the loader assembly can be maintained or separated from the tractor, it can be used safely without the risk of losing the detachable pin.

[0007] However, the above configuration has a poor connection structure for the detachable pin, and in particular, the structure preventing the detachable pin from coming off through the pin support elastic member cannot rule out the problem of the detachable pin separating from the bracket because the pin support elastic member may break if the handle of the detachable pin is grabbed and pulled strongly.

[0008] Accordingly, the present invention was developed to solve the above-mentioned problems, and the purpose of the invention is to provide a locking device for attaching and detaching a loader that eliminates the risk of loss of the connecting pin for attaching and detaching the loader.

[0009] In addition, another objective of the present invention is to provide a locking device for attaching and detaching a loader that enables locking and unlocking for coupling a tractor and a loader with simple operation.

[0010] One embodiment of the present invention for achieving the above-mentioned purpose is a locking device for attaching and detaching a loader to a mounting frame of a tractor, wherein the mounting frame is located at both ends of the tractor, and the mounting column is rotatably coupled to the boom end of the loader in correspondence with each side of the mounting frame, and each of the mounting columns has an outer surface and an inner surface that are spaced apart from each other, and the mounting frame is positioned between the two corresponding surfaces of the mounting column formed by the outer surface and the inner surface, and holes into which a part of a locking pin assembly for connecting the mounting frame and the mounting column is inserted are formed correspondingly on the two corresponding surfaces of the mounting column and one side of the surface of the mounting frame, and holes into which another part of the locking pin assembly is inserted to assist in connecting the mounting frame and the mounting column are formed correspondingly on the two corresponding surfaces of the mounting column and the other side of the surface of the mounting frame, and the other part of the locking pin assembly A locking device for attaching and detaching a loader is provided, wherein a hole formed on the outer surface of the mounting column among the holes into which the other part of the locking pin assembly is inserted is configured to guide the other part of the locking pin assembly to move in the left and right directions, and on one side of a hole formed on the surface of the mounting frame among the holes into which the other part of the locking pin assembly is inserted, the other part of the locking pin assembly is mounted after the part of the locking pin assembly and the other part of the locking pin assembly come out of the holes in order to release the connection between the mounting frame and the mounting column.

[0011] According to the present invention, the locking pin assembly comprises: a base portion having a bushing projection protruding from the center and bolted around a fitting hole on the outer surface of a mounting column on each side; a locking pin configured to pass through the bushing projection of the base portion and be fitted together with a fitting hole formed on each of two corresponding surfaces of the mounting column and a through hole of the mounting frame; a tension coil spring configured to surround the circumference of the locking pin while being supported on the upper end of the locking pin and to be elastically supported at the end of the base portion; an auxiliary pin located on one side of the locking pin outside the tension coil spring; and a locking handle screwed together to cover the upper end of the locking pin and the upper end of the auxiliary pin so as to rotate the auxiliary pin to the left and right around the locking pin as an axis.

[0012] Here, the tension coil spring wraps around the circumference of the bushing projection into which the locking pin is inserted, with one end fixed in a state of being caught on the bottom of the base portion between the bushing projection and the flange end, and the other end fixed to the top of the locking pin with a reduced end diameter so as to press the locking pin toward the fitting hole of the mounting column and the through hole of the mounting frame while resting on the top of the locking pin; the locking pin forms a step in the middle portion, with the lower part of the step being composed of a large diameter portion and the upper part of the step being composed of a small diameter portion, wherein the large diameter portion is configured to move between the fitting holes on two corresponding surfaces of the mounting column and the bushing projection, and when the locking handle is pulled to unlock the space between the mounting frame and the mounting column, the large diameter portion of the locking pin is caught on the end wall of the bushing projection and is configured to remain in a state of being received inside the bushing projection.

[0013] According to the present invention, the auxiliary pin is configured such that at least a portion of its lower end is formed as a stepped portion with a small diameter, and the mounting frame has an auxiliary pin hole formed on one side of a through hole such that the auxiliary pin is inserted while the mounting frame and the mounting column are connected, and a mounting projection is formed on one side adjacent to the auxiliary pin hole such that the auxiliary pin is mounted while the connection between the mounting frame and the mounting column is released.

[0014] According to the present invention, the mounting column has an auxiliary pin guide hole formed on its outer surface to guide the auxiliary pin to move in the left-right direction between the auxiliary pin hole of the mounting frame and the mounting projection by the rotation of the locking handle, and an auxiliary pin hole formed on its inner surface to be fitted with a stepped portion of the auxiliary pin when the mounting frame and the mounting column are connected. The auxiliary pin guide hole is composed of a small diameter hole in which the stepped portion of the auxiliary pin can be mounted and a large diameter hole through which the auxiliary pin passes. The small diameter hole point corresponds to a position where the auxiliary pin is supported on the mounting projection when the mounting frame and the mounting column are disconnected, and the large diameter hole point corresponds to a position where the stepped portion of the auxiliary pin passes through the auxiliary pin hole of the mounting frame and is inserted into the auxiliary pin hole formed on the inner surface of the mounting column when the mounting frame and the mounting column are connected.

[0015] From the features described above, the present invention eliminates the risk of loss of the coupling pin for attaching and detaching the loader, and also allows for locking and unlocking the connection between the tractor and the loader with very simple operation.

[0016] FIG. 1 is a drawing illustrating the detachable structure of a conventional loader assembly for a tractor.

[0017] FIG. 2 is a drawing illustrating the connection state between the mounting frame of a tractor and the mounting column of a loader coupled by the loader attachment / detachment locking device of the present invention.

[0018] FIG. 3 is an enlarged view showing a part of the configuration of the loader attachment / detachment locking device of the present invention for connecting the mounting frame of a tractor and the mounting column of a loader.

[0019] FIG. 4 is a drawing illustrating the configuration and assembly state of a locking pin assembly constituting a locking device for attaching and detaching a loader according to the present invention.

[0020] FIG. 5 is a drawing illustrating the locked state by the loader attachment / detachment locking device of the present invention when the mounting frame of the tractor and the mounting column of the loader are connected.

[0021] FIG. 6 is a drawing illustrating the operation of the loader attachment / detachment locking device of the present invention in an intermediate step for releasing the connection between the mounting frame of the tractor and the mounting column of the loader from the locked state of FIG. 5.

[0022] FIG. 7 is a drawing illustrating the unlocked state of the loader attachment / detachment locking device of the present invention when the mounting frame of the tractor and the mounting column of the loader are disconnected.

[0023] FIG. 8 is a drawing sequentially illustrating the connection process between the mounting frame of a tractor and the mounting column of a loader using the loader attachment / detachment locking device of the present invention.

[0024] The present invention will be explained in more detail below through the attached drawings and embodiments.

[0025] In the following embodiments, illustrations and descriptions have been omitted except for parts that are essential to describing the invention. Throughout the specification, identical or similar elements are given the same reference numerals, and detailed descriptions thereof are omitted without repetition.

[0026] FIG. 2 is a diagram showing the connection state between the mounting frame of a tractor and the mounting column of a loader coupled by the loader attachment locking device of the present invention, FIG. 3 is a diagram showing a part of the configuration of the loader attachment locking device according to the present invention for connecting the mounting frame of a tractor and the mounting column of a loader, wherein the loader attachment locking device of the present invention is provided to connect the mounting frame (10) of a tractor and the mounting column (20) of a loader.

[0027] A mounting frame (10) is positioned at both ends of a tractor (not shown), and a mounting column (20) is provided to be rotatably coupled to the end of the boom (30) of the loader (1) corresponding to each side of the mounting frame (10).

[0028] Each of the mounting columns (20) has an outer surface (21) and an inner surface (21') that are spaced apart from each other and have a structure in which the middle portions of these two corresponding surfaces (21, 21') are connected to each other by a mounting bracket (22) for mounting on the mounting frame (10) of the tractor. The mounting frame (10) has a support groove (11) formed at the top to support the mounting bracket (22) connecting the two corresponding surfaces (21, 21') of the mounting columns (20), and a through hole (12) is formed on the surface of the mounting frame (10) below the support groove (11) through which a locking pin (120; see FIG. 4a), which is a component of the locking device of the present invention, passes.

[0029] On the outer surface (21) and inner surface (21') of the mounting column (20), a fitting hole (23) (23') into which a locking pin (120; see FIG. 4a) is inserted is formed on one side of the lower portion of the mounting bracket (22), corresponding to the through hole (12) of the mounting frame (10). On the other side of the lower portion of the mounting bracket (22), a boom cylinder connecting part (24) is formed to which a boom cylinder (40) (see FIG. 8a and 8c) for operating the boom (30) of the loader (1) is connected.

[0030] FIG. 4 shows the configuration of a locking pin assembly constituting a loader attachment / detachment locking device of the present invention in an exploded perspective view (Fig. 4a) and an assembled perspective view (Fig. 4b), respectively. The locking pin assembly (100) comprises a base part (110) having a bushing projection (111) protruding around a fitting hole (23) on an outer surface (21) among two corresponding surfaces (21, 21') of a mounting column (20) on each side, having a through hole (111a) in the center, and a locking pin (120) configured to pass through the bushing projection (111) of the base part and be fitted into the fitting holes (23) (23') formed on the two corresponding surfaces (21, 21') of the mounting column (20) and the through hole (12) of the mounting frame (10) between them, and a locking pin (120) that wraps around the circumference of the locking pin (120) while being supported at the top of the locking pin and at the end of the base part (110). It includes a tension coil spring (130) configured to be elastic, an auxiliary pin (140) located on one side of the locking pin (120) on the outside of the tension coil spring, a locking handle (150) that covers the top of the locking pin (120) and the top of the auxiliary pin (140) together so as to rotate the auxiliary pin (140) to the left and right around the locking pin (120) as an axis and is fastened to the top of each pin with screws (151, 152), and a corrugated boot (160) that wraps around the outside of the tension coil spring (130) and is located between the locking handle (150) and the base part (110).

[0031] The corrugated boot (160) is made of rubber or synthetic resin and has a structure in which multiple corrugations are formed along its entire length so as to be stretchable in the longitudinal direction. Both ends of the corrugated boot (160) are respectively connected to a flange end (112) that protrudes around a bushing projection (111) of a base part (110) and a protruding end (153) of a locking handle (150) that extends around a tension coil spring (130) surrounding a locking pin (120), using a predetermined fixing means (161), such as a cable tie.

[0032] The tension coil spring (130) is provided in a compressed state and configured to apply stress to a predetermined tensile load. One end of the tension coil spring (130) wraps around the circumference of the bushing projection (111) into which the locking pin (120) is inserted and is fixed in a hooked state on the bottom of the base portion (110) between the bushing projection (111) and the flange end (112). The other end of the tension coil spring (130) is fixed to the top of the locking pin (120) with a reduced end diameter so as to press the locking pin (120) toward the insertion hole (23)(23') of the mounting column (20) and the through hole (12) of the mounting frame (10) while mounted on the top of the locking pin (120).

[0033] The locking pin (120) and the auxiliary pin (140) each have a screw groove (123) (142) for screw fastening at their respective upper ends, and the locking pin (120) forms a step in the middle part so that the lower part of the step is a large diameter part (121) and the upper part of the step is a small diameter part (122), and the auxiliary pin (140) may be configured such that at least a lower part is a step part (141) with a small diameter.

[0034] The large diameter portion (121) of the locking pin (120) is configured to move between the fitting holes (23)(23') of the two corresponding surfaces (21, 21') of the mounting column (20) and the bushing projection (111), and it is preferable to configure the locking pin (120) so that when the locking handle (150) is pulled to unlock the mounting frame (10) and the mounting column (20) as described in FIG. 6 below, the locking pin (120) does not completely come out of the bushing projection (111), and the large diameter portion (121) of the locking pin (120) is caught on the end wall of the bushing projection (111) and remains in a state of being received inside the bushing projection (111).

[0035] Meanwhile, referring to FIG. 3, the mounting frame (10) has an auxiliary pin hole (13) formed on one side of the through hole (12) so that an auxiliary pin (140) is inserted while the mounting frame (10) and the mounting column (20) are connected, and a mounting projection (14) is formed on one side adjacent to the auxiliary pin hole (13), preferably on the opposite side facing the boom (30) of the loader (1), so that the auxiliary pin (140) is mounted when the connection between the mounting frame (10) and the mounting column (20) is released.

[0036] Additionally, the mounting column (20) has an auxiliary pin guide hole (25) formed on the outer surface (21) of the two corresponding surfaces (21, 21') to guide the auxiliary pin (140) to move in the left and right directions between the auxiliary pin hole (13) and the mounting projection (14) of the mounting frame (10) by the rotation of the locking handle (150), and on the inner surface (21'), an auxiliary pin hole (26) into which the stepped portion (141) of the auxiliary pin (140) is fitted when the mounting frame (10) and the mounting column (20) are connected is preferably formed corresponding to the auxiliary pin hole (13) of the mounting frame (10).

[0037] The auxiliary pin guide hole (25) formed on the outer surface (21) of the mounting column (20) is composed of a small diameter hole (F1) through which the stepped portion (141) of the auxiliary pin (140) can be mounted and a large diameter hole (F2) through which the auxiliary pin (140) passes. Here, the small diameter hole (F1) corresponds to a position where the auxiliary pin (140) is supported on the mounting projection (14) when the mounting frame (10) and the mounting column (20) are disconnected (see FIG. 7), and the large diameter hole (F2) corresponds to a position where the auxiliary pin (140) passes through the auxiliary pin hole (13) of the mounting frame (10) and is inserted into the auxiliary pin hole (26) formed on the inner surface (21') of the mounting column (20) when the mounting frame (10) and the mounting column (20) are connected (see FIG. 5).

[0038]

[0039] The operation of the loader attachment / detachment locking device of the present invention, based on the configuration described above and the connection or disconnection of the mounting frame of the tractor and the mounting column of the loader, will be explained below in order with reference to FIGS. 5 to 7.

[0040] FIG. 5 illustrates the locking state of the loader attachment / detachment locking device of the present invention when the mounting frame of the tractor and the mounting column of the loader are connected, and FIG. 5c is a cross-sectional view along line AA of FIG. 5b. When the mounting frame (10) of the tractor and the mounting column (20) of the loader (1) are connected, the locking pin (120) is pressed in the direction of the lower end (131) by the upper end (132) of a tension coil spring (130) with a narrow diameter, and in this state, the locking pin (120) passes through the through hole (12) of the mounting frame (10) and remains in a state of being fitted into the two corresponding surfaces (21, 21') of the mounting column (20). At this time, the auxiliary pin (140) is located at point F2 (large diameter hole) in Fig. 3, and the auxiliary pin (140) is inserted into the auxiliary pin hole (26) on the inner surface (21') of the mounting column (20) after passing through the auxiliary pin guide hole (25) on one side of the mounting column (20) and the auxiliary pin hole (13) of the mounting frame (10), respectively.

[0041] FIG. 6 illustrates the operation of the loader attachment / detachment locking device of the present invention in an intermediate step for releasing the connection between the mounting frame of the tractor and the mounting column of the loader from the locked state of FIG. 5, FIG. 6c is a cross-sectional view along line A'-A' of FIG. 6b, and FIG. 7 illustrates the unlocked state of the loader attachment / detachment locking device of the present invention when the connection between the mounting frame of the tractor and the mounting column of the loader is released, FIG. 7c is a cross-sectional view along line A"-A" of FIG. 7b. To release the connection between the mounting frame (10) of the tractor and the mounting column (20) of the loader, the locking handle (150) is grasped and the locking handle (150) is pulled in a direction that tensions the tension coil spring (130) so that the locking pin (120) passes through the through hole (12) of the mounting frame (10). When the locking pin (120) is out of the through hole (12) of the mounting frame (10), the auxiliary pin (140) is also completely out of the auxiliary pin hole (13) of the mounting frame (10). At this time, when the locking handle (150) is rotated to move the auxiliary pin (140) to the position of F1 (small diameter hole) in Fig. 3, the auxiliary pin (140) rotates around the locking pin (120) and is positioned on the mounting projection (14). When the locking handle (150) is released in this state, the auxiliary pin (140) is mounted on the upper surface of the mounting projection (14) by the tension of the tension coil spring (130).

[0042]

[0043] FIG. 8 sequentially illustrates the process of connecting the mounting frame of a tractor and the mounting column of a loader using the loader attachment / detachment locking device of the present invention, and FIG. 8a shows the first process for combining the mounting frame of a tractor and the mounting column of a loader.

[0044] First, with the tractor and loader separated, the boom cylinder (40) is driven to mount a support (22) connecting two corresponding surfaces (21, 21') of the loader's mounting column (20) onto a support groove (11) formed on the top of the tractor's mounting frame (10), and additionally, the boom cylinder (40) is driven to rotate the loader's mounting column (20) around the support (22) so that the stepped portion (141) of the auxiliary pin (140) comes close to the mounting projection (14).

[0045] At this time, the auxiliary pin (140) is mounted with the stepped portion (141) at the small diameter hole (F1) of the auxiliary pin guide hole (25) in the same state as when the mounting frame (10) and the mounting column (20) are separated. In this state, the locking pin (120) is completely out of the through hole (12) of the mounting frame (10), and the tension coil spring (130) is tensioned upward.

[0046] FIG. 8b illustrates a second process for combining the mounting frame of a tractor and the mounting column of a loader, and FIG. 8c illustrates a third process for combining the mounting frame (10) of a tractor and the mounting column (20) of a loader, wherein the boom cylinder (40) is further driven so that the stepped portion (141) of the auxiliary pin (140) comes into close contact with the mounting projection (14), and then the boom cylinder (40) is continued to drive so that the stepped portion (141) of the locking pin is pushed by the mounting projection (14) and moves to the large diameter hole (F2) of the auxiliary pin guide hole (25). At this time, the locking pin (120) descends by the tension of the tension coil spring (130) and passes through the through hole (12) of the mounting frame (10), and is then inserted into the fitting holes (23) (23') of the two corresponding surfaces (21, 21') of the mounting column (20). Additionally, the auxiliary pin (140) passes through the large diameter hole (F2) of the auxiliary pin guide hole (25) and the auxiliary pin hole (13) of the mounting frame (10), and then the stepped portion (141) is fitted into the auxiliary pin hole (26) formed on the inner surface of the mounting column (20).

[0047] In this way, the present invention enables the mounting frame (10) of the tractor and the mounting column (20) of the loader to be connected simply by the operation of the boom cylinder (40) while the tractor and the loader are separated.

[0048] Although various embodiments of the present invention have been described above, the descriptions made so far are merely illustrative of some preferred embodiments of the present invention and are not limited by the foregoing except for those that may appear in the claims appended below. Accordingly, those skilled in the art should understand that the present invention allows for many changes, modifications, and substitutions of equivalents within the scope described in the following claims without departing from the technical spirit and essence of the invention.

Claims

1. A locking device for attaching and detaching a loader to connect the mounting column of a loader to the mounting frame of a tractor, The above-mentioned mounting frame is located at both ends of the tractor, and the above-mentioned mounting column is rotatably coupled to the boom end of the loader, corresponding to the mounting frame on each side; each of the above-mentioned mounting columns has an outer surface and an inner surface that are spaced apart from each other, and a mounting frame is positioned between the two corresponding surfaces of the mounting column, which are the outer surface and the inner surface; holes into which a part of a locking pin assembly for connecting the mounting frame and the mounting column is inserted are formed correspondingly on the two corresponding surfaces of the mounting column and one side of the surface of the mounting frame, respectively; holes into which another part of the locking pin assembly is inserted to assist in the connection between the mounting frame and the mounting column are formed correspondingly on the two corresponding surfaces of the mounting column and the other side of the surface of the mounting frame, respectively; among the holes into which the other part of the locking pin assembly is inserted, the hole formed on the outer surface of the mounting column is configured to guide the other part of the locking pin assembly to move in the left and right directions, and the other part of the locking pin assembly inserted A locking device for attaching and detaching a loader, characterized in that, among the holes, one side of a hole formed on the surface of the mounting frame is configured to support another part of the locking pin assembly after a part of the locking pin assembly and another part of the locking pin assembly have come out of the holes in order to release the connection between the mounting frame and the mounting column.

2. In Paragraph 1, A locking device for attaching and detaching a loader, characterized in that the above locking pin assembly comprises: a base portion having a bushing projection protruding from the center and bolted around a fitting hole on the outer surface of a mounting column on each side; a locking pin configured to pass through the bushing projection of the base portion and be fitted together into a fitting hole formed on each of two corresponding surfaces of the mounting column and a through hole of the mounting frame; a tension coil spring configured to surround the circumference of the locking pin while being supported on the upper end of the locking pin and to be elastically supported at the end of the base portion; an auxiliary pin located on one side of the locking pin outside the tension coil spring; and a locking handle screw-coupled to cover the upper end of the locking pin and the upper end of the auxiliary pin together so as to rotate the auxiliary pin to the left and right around the locking pin as an axis.

3. In Paragraph 2, A locking device for attaching and detaching a loader, further comprising a corrugated boot made of rubber or synthetic resin material that wraps around the outside of the tension coil spring and is positioned between the locking handle and the base part, wherein the corrugated boot has a structure in which a plurality of corrugations are formed along its entire length so as to be elastic in the longitudinal direction, and wherein both ends of the corrugated boot are respectively connected to a flange end protruding around a bushing projection of the base part and a protruding end of the locking handle extending around the tension coil spring using a predetermined fastening means including a cable tie.

4. In Paragraph 3, A locking device for attaching and detaching a loader, characterized in that the tension coil spring wraps around the circumference of a bushing projection into which the locking pin is inserted, one end is fixed in a hooked state on the bottom of the base portion between the bushing projection and the flange end, and the other end is fixed to the top of the locking pin with a reduced end diameter so as to press the locking pin toward the fitting hole of the mounting column and the through hole of the mounting frame while mounted on the top of the locking pin.

5. In Paragraph 2, A locking device for attaching and detaching a loader, characterized in that the above-described locking pin forms a step in the middle portion, wherein the lower portion of the step is configured as a large diameter portion and the upper portion of the step is configured as a small diameter portion, wherein the large diameter portion is configured to move between the fitting holes of two corresponding surfaces of the mounting column and the bushing projection, and when the locking handle is pulled to unlock the mounting frame and the mounting column, the large diameter portion of the locking pin is configured to be caught on the end wall of the bushing projection and maintain a state of being received inside the bushing projection.

6. In Paragraph 2, A locking device for attaching and detaching a loader, characterized in that the auxiliary pin is composed of at least a lower portion having a small diameter stepped portion, the mounting frame has an auxiliary pin hole formed on one side of a through hole configured to allow the auxiliary pin to be inserted while the mounting frame and the mounting column are connected, and a mounting projection is formed on one side adjacent to the auxiliary pin hole to allow the auxiliary pin to be mounted while the connection between the mounting frame and the mounting column is released.

7. In Paragraph 6, A locking device for attaching and detaching a loader, characterized in that the mounting column has an auxiliary pin guide hole formed on its outer surface to guide the auxiliary pin to move in the left and right directions between the auxiliary pin hole of the mounting frame and the mounting projection by the rotation of the locking handle, and an auxiliary pin hole formed on its inner surface into which the stepped portion of the auxiliary pin is fitted when the mounting frame and the mounting column are connected, wherein the auxiliary pin guide hole is composed of a small diameter hole into which the stepped portion of the auxiliary pin can be mounted and a large diameter hole through which the auxiliary pin passes, wherein the small diameter hole point corresponds to a position where the auxiliary pin is supported on the mounting projection when the mounting frame and the mounting column are disconnected, and the large diameter hole point corresponds to a position where the stepped portion of the auxiliary pin passes through the auxiliary pin hole of the mounting frame and is inserted into the auxiliary pin hole formed on the inner surface of the mounting column when the mounting frame and the mounting column are connected.

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