KR102532407B1 - Leg device for yard trailer - Google Patents

Abstract

The present invention is to provide a leg device for a yard trailer that has an automatic recovery function after buffering in the event of an external impact. According to an embodiment of the present invention, a leg device for a yard trailer comprises: an upper body; a joint member coupled to the lower end of the upper body; a lower body which is arranged in parallel with the upper body with the joint member in between, is formed to bend to the opposite side of a shock with respect to the joint member in the event of the external shock, and is restored to the initial position when the external shock is released; a wire rope which has both ends connected between the upper body and the lower body, and enables bending and restoration of the lower body; and a coil spring which provides elastic force necessary for restoration of the lower body.

Description

Leg device for yard trailer {LEG DEVICE FOR YARD TRAILER}

The present invention relates to a leg for a yard trailer, and more particularly, to a leg device for a yard trailer having an automatic return function after shock absorption.

In general, a yard trailer is provided with at least one leg for being seated on the ground.

FIG. 1 is a perspective view briefly illustrating a general yard trailer. Referring to FIG. 1, the yard trailer 10 includes a chassis, that is, a body 11 that is long in front and rear. The lower part of the body of the yard trailer 10 is provided with wheels 12 for movement.

And the yard trailer 10 is provided with at least one leg 13 .

However, the leg 13 of the yard trailer 10 plays a role of supporting the leg 13 by being seated on the ground when the yard trailer 10 is stopped, but when the yard trailer 10 is moving, The case where the protruding leg 13 collides with various objects protruding from the ground and the leg 13 is damaged frequently occurs.

2 and 3 are conceptual views showing the state of operation when the yard trailer is stopped and operated.

Referring to FIG. 2 , when the yard trailer 10 is stopped, the legs 13 are seated on the ground to support the yard trailer 10 . At this time, it is possible to maintain a predetermined safety distance (L1) from the ground.

Referring to FIG. 3, the yard trailer 10 is in operation. In this case, the chassis of the yard trailer 10, that is, the main body 11 is lifted to a certain height. The distance L2 can be secured.

However, in case of emergency, if the safety distance L2 required during operation of the yard trailer 10 is not secured, collisions with various interfering objects protruding from the ground may occur, and the legs 13 may be damaged.

4 shows a phenomenon in which a leg device is damaged due to an impact during movement of a yard trailer.

Referring to FIG. 4, when the yard trailer is running, a part of the leg 13 connected to the lower part of the main body 11 collides with the crane rail 20 protruding above the ground, and an impact is generated on the leg 13. show

Therefore, even when an external impact is applied during operation of the yard trailer, it is possible to protect the legs 13 from impact, and when the impact is released, the development of technology for a yard trailer leg device that can restore the posture to its original state is necessary. It is necessary.

As a conventional prior art related to the present invention, there is Korean Utility Model Publication No. 1989-0003858, and in the prior art, contents related to an auxiliary support device for a landing leg for a trailer are disclosed.

Republic of Korea Utility Model Publication No. 1989-0003858

An object of the present invention is to provide a leg device for a yard trailer having an automatic return function after shock absorption.

The objects of the present invention are not limited to the above-mentioned objects, and other objects and advantages of the present invention not mentioned above can be understood by the following description and will be more clearly understood by the examples of the present invention. It will also be readily apparent that the objects and advantages of the present invention may be realized by means of the instrumentalities and combinations indicated in the claims.

In order to achieve the above object, according to one aspect of the present invention, there is provided a leg device for a yard trailer having an automatic return function after shock absorption.

A leg device for a yard trailer according to an embodiment of the present invention includes an upper body; a joint member coupled to the lower end of the upper body; a lower body disposed side by side with the upper body with the joint member interposed therebetween, formed to be bent to the opposite side of the joint member upon external impact, and restored to an initial position when the external shock is released; a wire rope having both ends connected between the upper body and the lower body and allowing the lower body to be bent and restored; and a coil spring providing an elastic force required to restore the lower body.

The upper body may be fixed to the lower part of the main body of the yard trailer.

One end of the wire rope moves up and down along the inner hollow of the upper body, the other end of the wire rope is constrained to the inside of the lower body, and the wire rope is bent and restored when the lower body is bent and restored. It can move up and down through the body and the joint member.

The upper body includes an elevation plate movable up and down along the inner hollow of the upper body; and a locking block attached to the lifting plate and connected to one end of the wire rope.

The lifting plate includes a lifting plate body formed corresponding to the cross-sectional shape of the inner hollow of the upper body and movable along the inner hollow, and one end connected to the locking block at the inner center of the lifting plate body. A first center hole through which a wire rope passes is provided, an upper step groove to which the locking block is seated and connected is provided on the upper part of the lifting plate body, and a lower step groove is provided on the lower part of the lifting plate body. .

The coil spring is embedded in the longitudinal direction through the inner hollow of the upper body, one end of the coil spring is constrainedly connected to the lower stepped groove, and the other end of the coil spring is positionally constrained to the lower end of the upper body. can

The upper body further includes a support protruding upward by a set length from the lower end of the upper body along the inner hollow, and the upper end of the support is located on a certain height of the inner hollow to move the elevating plate downward. The distance is limited, and the lower end of the support is positionally constrained to the lower end of the upper body so that it can be installed and fixed through the other end of the coil spring.

The joint member includes a conical body having an upper end fixed to a lower portion of the upper body and a conical lower end having a conical shape, and the other end of the wire rope, one end of which is connected to the upper body, passes through and is drawn out. and a second center hole, and the lower end of the conical body may have a first sliding surface inclined downward from an outer end toward an inner end close to the second center hole.

The lower body may include a cylindrical housing in close contact with the lower part of the joint member; a support plate coupled to cover the lower end of the cylindrical housing and supported in contact with the ground; a fixing plate fixed in a cross-sectional direction inside the cylindrical housing; and a fixing nut for binding and connecting the other end of the wire rope to the fixing plate.

A sliding member that is coupled to the upper end of the cylindrical housing and slides along the first sliding surface of the conical body when the lower body is bent and restored in an arbitrary direction of 360 degrees based on the second center hole. contains more

The sliding member may include an annular body coupled to correspond to the upper end of the cylindrical housing; an insertion protrusion that protrudes from the lower end of the annular body and is fixed in contact with the inner wall surface of the cylindrical housing; and a second sliding surface provided at an upper end of the annular body and sliding in contact with the first sliding surface.

A connection frame screwed to the joint member and constraining the joint member to the lower portion of the main body of the yard trailer.

The connection frame may include an annular frame body surrounding an upper end of the joint member; and a screw hole formed to fasten the fastening screw to at least a portion of the joint member through the frame body, and when the fastening screw is fastened, the screw head of the fastening screw may be inserted into the frame body. .

A welding connection portion that is pre-welded before fastening of the fastening screws is further provided between the connection frame and the lower portion of the main body of the yard trailer, and after the connecting frame is pre-welded, the upper body is attached to the lower portion of the main body of the yard trailer. Inserted into the prepared inner space, when the upper body is inserted, the guide bolt protruding from the upper end of the joint member may be inserted into a guide groove provided in the connection frame and aligned.

According to the leg device for a yard trailer according to the present inventors, there is an advantage of having an automatic return function after shock absorption.

In addition, according to the leg device for a yard trailer of the present invention, by using a spring and a wire rope, when an external impact is applied to the leg device, a part of the leg device is bent and then restored to its original position by the elastic force of the spring, so that it can automatically return after impact There are advantages.

In addition, according to the leg device for a yard trailer according to the present invention, the leg device can have a structure capable of being bent in all directions by applying the shape of the bending connection portion in which the leg device is bent to a conical shape, so that even if an impact is applied from any direction among 360-degree directions, the leg device It has the advantage of preventing breakage and damage and stably protecting the leg device from external impact.

In addition, according to the leg device for a yard trailer according to the present invention, assembly and disassembly between components are easy, so that repair and replacement of the device are easy to use.

In addition to the effects described above, specific effects of the present invention will be described together while explaining specific details for carrying out the present invention.

1 is a perspective view briefly showing a leg device for a yard trailer.
2 and 3 are conceptual views showing the state of operation when the yard trailer is stopped and operated.
4 is a conceptual diagram showing a phenomenon in which a leg device is damaged due to an impact during movement of a yard trailer;
Figure 5 is a perspective view briefly showing a leg device for a yard trailer according to an embodiment of the present invention.
6 is an operation diagram showing a state in which an impact is applied to the leg device for a yard trailer according to an embodiment of the present invention and the leg device is bent and deformed;
7 is an operation diagram showing a state in which the leg device is restored to an initial shape after an impact applied to the leg device for a yard trailer according to an embodiment of the present invention is removed.
8 and 9 are views illustrating an assembly structure of a leg device for a yard trailer according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings so that those skilled in the art can easily carry out the present invention. This invention may be embodied in many different forms and is not limited to the embodiments set forth herein.

In order to clearly describe the present invention, parts irrelevant to the description are omitted, and the same reference numerals are assigned to the same or similar components throughout the specification. In addition, some embodiments of the present invention are described in detail with reference to exemplary drawings. In adding reference numerals to components of each drawing, the same components may have the same numerals as much as possible even if they are displayed on different drawings. In addition, in describing the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description may be omitted.

In describing the components of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are only used to distinguish the component from other components, and the nature, sequence, order, or number of the corresponding component is not limited by the term. When an element is described as being “connected,” “coupled to,” or “connected” to another element, that element is or may be directly connected to that other element, but intervenes between each element. It will be understood that may be "interposed", or each component may be "connected", "coupled" or "connected" through other components.

In addition, in implementing the present invention, components may be subdivided for convenience of explanation, but these components may be implemented in one device or module, or one component may be implemented in a plurality of devices or modules. It may be implemented by dividing into .

In the drawings, FIG. 5 is a perspective view briefly showing a leg device for a yard trailer according to an embodiment of the present invention, and FIGS. 6 and 7 are a state in which an impact is applied to the leg device for a yard trailer and the leg device is bent and deformed and impact This is a view showing the appearance of the leg device restored to its initial shape after the removal. 8 and 9 are diagrams for explaining an assembly structure of a leg device for a yard trailer according to an embodiment of the present invention.

A leg device 100 for a yard trailer according to an embodiment of the present invention includes an upper body 110, a joint member 160, a lower body 180, a wire rope 150, and a coil spring 140. do.

The upper body 110 may be fixed to the lower part of the main body 11 of the yard trailer 10.

The joint member 160 may be coupled to the lower end of the upper body 110 .

The lower body 180 is disposed side by side with the upper body 110 with the joint member 160 interposed therebetween, and is formed to be bent in a predetermined direction with respect to the joint member 160 when an external impact occurs, and external impact release It can be restored to the initial position.

Both ends of the wire rope 150 are connected between the upper body 110 and the lower body 180, and may allow the lower body 180 to be bent and restored.

As a specific example, one end of the wire rope 150 may move up and down along the inner hollow 111 of the upper body 110. And the other end of the wire rope 150 may be constrained to the inside of the lower body 180.

According to this configuration, the wire rope 150 can move up and down through the upper body 110 and the joint member 160 when the lower body 180 is bent and restored.

The coil spring 140 may provide elastic force necessary for restoring the lower body 180 .

In the yard trailer leg device 100 according to an embodiment of the present invention, the upper body 110 further includes a lifting plate 120 and a locking block 130.

The lifting plate 120 is formed to be movable up and down along the inner hollow 111 of the upper body 110, and serves as a push rod to push the coil spring 140.

The locking block 130 is in close contact with the lifting plate 120 and may be connected to one end of the wire rope 150. When the other end of the wire rope 150 is guided by the lower body 180 and moves out of the upper body 110, the locking block 130 pushes the lifting plate 120 up and down to compress the coil spring 140. You can apply the load required to do so.

As a specific example, the elevating plate 120 further includes an elevating plate body 121 movable up and down along the inner hollow 111 corresponding to the cross-sectional shape of the inner hollow 111 of the upper body 110. .

A first center hole 127 may be provided at the inner center of the lifting plate body 121 so that the wire rope 150, one end of which is connected to the holding block 130, passes through.

In addition, an upper step groove 123 to which the locking block 130 is seated and connected may be provided on the upper part of the elevating plate body 121 . Accordingly, the locking block 130 can be fixed in position on the upper part of the lifting plate body 121 without shaking left and right, and can stably push the lifting plate body 121 up and down.

In addition, a lower stepped groove 125 may be provided at a lower portion of the elevating plate body 121 . The lower stepped groove 125 is used as a groove in which one end of the coil spring 9140 is constrained.

The coil spring 140 may be embedded in the longitudinal direction through the inner hollow 111 of the upper body 110 .

For example, one end of the coil spring 140 may be constrainedly connected to the lower stepped groove 125, and the other end of the coil spring 140 may be positionally constrained to the lower end of the upper body 110. More specifically, the other end of the coil spring 140 may be constrained to the installation groove provided on the upper part of the joint member 160 connected to the lower end of the upper body 110 .

And the upper body 110 further includes a support 131 . The support 131 refers to a member that protrudes upward from the lower end of the upper body 110 along the inner hollow 111 by a set length.

The upper end 132 of the support 131 may be positioned on a predetermined height of the inner hollow 111 to limit a downward movement distance of the elevating plate 120 . In other words, the lifting plate 120 can descend only to the position of the upper end 132 of the support 131 .

In addition, the lower end 133 of the support 131 is positioned at the lower end of the upper body 110 and can be installed and fixed through the other end of the coil spring 140 . Specifically, the lower end 133 of the support 131 may be connected to and fixed to the upper part of the joint member 160 connected to the lower end of the upper body 110 .

Meanwhile, in the yard trailer leg device 100 according to an embodiment of the present invention, the joint member 160 has a conical body 161 having an upper end fixed to the lower portion of the upper body 110 and a lower end having a conical shape. include

The conical body 161 may have a second center hole 169 through which the other end of the wire rope 150, one end of which is connected to the upper body 110, is drawn out.

Also, the lower end of the conical body 161 may have a first sliding surface 167 inclined downward from the outer end 165 toward the inner end 163 close to the second center hole 169 .

Meanwhile, in the yard trailer leg device 100 according to an embodiment of the present invention, the lower body 180 includes a cylindrical housing 181, a support plate 182, a fixing plate 183, and a fixing nut 185 includes

The cylindrical housing 181 refers to a lower portion of a cylindrical leg in close contact with the lower portion of the joint member 160 . The support plate 182 is coupled to cover the lower end of the cylindrical housing 181 and refers to a bottom support portion supported in contact with the ground.

The fixing plate 183 may be fixed in a cross-sectional direction inside the cylindrical housing 181 .

In addition, the fixing nut 185 may be connected to the fixing plate 183 by binding the other end of the wire rope 150 to the fixing plate 183 . For example, the fixing nut 185 may use a nylon nut.

In addition, the yard trailer leg device 100 according to an embodiment of the present invention further includes a sliding member 190.

The sliding member 190 may be coupled to an upper end of the cylindrical housing 181 . When the lower body 180 is bent and restored, the sliding member 190 moves along the first sliding surface 167 of the conical body 161 in any direction of 360 degrees relative to the second center hole 169. It can slide and move (see FIGS. 6 and 7).

For example, the sliding member 190 includes an annular body 191 coupled to correspond to the upper end of the cylindrical housing 181 . A second sliding surface 195 is provided at an upper end of the annular body 191 , and the second sliding surface 195 may come into contact with the first sliding surface 195 .

Accordingly, when the lower body 180 is bent and restored, the sliding member 190 slides in any direction of 360 degrees, that is, in all directions, along the first sliding surface 195 formed on the lower part of the conical body 161 can move

In addition, the sliding member 190 further includes an insertion protrusion 193 that protrudes from the lower end of the annular body 191 and is fixed in contact with the inner wall surface of the cylindrical housing 181 .

In addition, the yard trailer leg device 100 according to an embodiment of the present invention further includes a connecting frame 170.

The connection frame 170 is screwed to the joint member 160, and the joint member 160 can be constrained to the lower portion of the main body 11 of the yard trailer 10.

For example, the connecting frame 170 includes a frame body 171 and a screw ball 173 . The frame body 171 may have an annular body surrounding the upper end of the joint member 160 .

The screw hole 173 may be formed to fasten the fastening screw 175 to at least a part of the joint member 160 through the frame body 171 .

For example, when the fastening screw 175 is fastened, the fastening screw 175 penetrates the screw hole 173 and enters the screw groove 162 of the joint member 160 to be fastened and fixed. At this time, the screw head 177 of the fastening screw 175 is inserted into the frame body 171 and may not protrude to the outside.

The operation process of the present invention will be described.

In the leg device 100 for a yard trailer according to an embodiment of the present invention, the upper body 110, the joint member 160, and the lower body 110 can be maintained in a straight line before an external impact is applied (FIG. 5 reference).

However, if an external impact is applied to the lower body 110, the lower body 110 is bent to the opposite side to which the impact is applied. The sliding member 190 provided at the upper end of the lower body 110 may guide the free bending posture of the lower body 110 while sliding along the first sliding surface 167 of the joint member 160 . At this time, since the other end of the wire rope 150 connected to the lower body 110 is pulled outward, the locking block 130 connected to one end of the wire rope 150 descends, and the In association with the descent, the elevation plate 120 also descends. As a result, the coil spring 140 is compressed in the P1 direction (see FIG. 6).

After the impact has been applied, when the external impact is removed, the coil spring 140 is elastically restored in the P2 direction (see FIG. 6), and the lifting plate 120 and the locking block 130 rise. The lower body 180 to which the other end of the wire rope 150 is connected is restored to its initial position before the impact is applied by the rise of the hooking block 130 to which one end of the wire rope 150 is connected. When restoring, the sliding member 190 provided at the upper end of the lower body 110 will gently guide the free restoring posture of the lower body 110 while sliding along the first sliding surface 167 of the joint member 160. can

Hereinafter, an assembly process of the yard trailer leg device 100 according to an embodiment of the present invention will be described.

Referring to FIG. 8 , the connection frame 170 is connected to the lower part of the main body 11 of the yard trailer 10 by welding. In other words, the connection frame 170 may further include a welding connection portion 210 that is pre-welded before the fastening screw 175 is fastened.

After the connection frame 170 is first welded, the upper body 110 may be assembled along a predetermined assembly direction to be inserted into the inner space 220 provided under the main body 11 of the yard trailer 10. Subsequently, referring to FIG. 9 , when the upper body 110 is inserted, the guide bolts 231 protruding from the upper end of the joint member 160 are inserted into the guide grooves 233 provided in the connection frame 170 to fit each other. It can be combined in a custom fit, whereby positional alignment can be ensured during assembly. Next, the fastening screw 175 is fastened through the screw ball provided in the frame body 171 so that the connection frame 170 and the joint member 160 can be fixed.

As described above, according to the configuration and operation of the present invention, it is possible to implement an automatic return function after buffering in the event of an external shock to the leg device for a yard trailer.

Specifically, by using a spring and a wire rope, when an external impact is applied to the leg device, a part of the leg device may be bent and then restored to its original position by the elastic force of the spring. Accordingly, it is possible to prevent breakage or damage of the leg device due to an external impact, and after the impact is removed, it can quickly and automatically return to its original position by an elastic force.

Furthermore, according to the present invention, the leg device can have a structure capable of being bent in all directions by applying the shape of the bending connector in which the leg device is bent in a conical shape, so that even if an impact is applied in any direction of 360 degrees, the leg device is not damaged or damaged. It can be prevented. Accordingly, it is possible to protect the leg device from impact in the direction of 360 degrees. Furthermore, according to the present invention, it is easy to assemble and disassemble between components, so that repair and replacement of the device are easy.

As described above, the present invention has been described with reference to the drawings illustrated, but the present invention is not limited by the embodiments and drawings disclosed herein, and various modifications are made by those skilled in the art within the scope of the technical idea of the present invention. It is obvious that variations can be made. In addition, although the operational effects according to the configuration of the present invention have not been explicitly described and described while describing the embodiments of the present invention, it is natural that the effects predictable by the corresponding configuration should also be recognized.

10: Yard Trailer
11: body
12: wheel
13: leg
100: leg device for yard trailer
110: upper body
111: inner hollow
120: lifting plate
121: lifting plate body
123: upper step groove
125: lower stepped groove
127: first central hole
130: jam block
131: support
132: upper part of support
133: lower part of support
140: coil spring
150: wire rope
160: joint member
161: conical body
162: screw groove
163: inner end
165: outer end
167: first sliding surface
169: second central hole
170: connection frame
171: frame body
173: screw ball
175: fastening screw
177: screw head
180: lower body
181: cylindrical housing
182: support plate
183 fixed plate
185: fixing nut
190: sliding member
191: annular body
193: insertion protrusion
195: second sliding surface
210: welding connection
220: inner space
231: guide bolt
233: guide groove

Claims (10)

upper body;
a joint member coupled to the lower end of the upper body;
a lower body disposed side by side with the upper body with the joint member interposed therebetween, formed to be bent to the opposite side of the joint member upon external impact, and restored to an initial position when the external shock is released;
a wire rope having both ends connected between the upper body and the lower body and allowing the lower body to be bent and restored; and
a coil spring providing an elastic force required to restore the lower body;
Leg device for a yard trailer comprising a.
According to claim 1,
The upper body,
Characterized in that it is fixed to the lower part of the main body of the yard trailer
Leg unit for yard trailer.
According to claim 1,
One end of the wire rope moves up and down along the inner hollow of the upper body,
The other end of the wire rope is constrained to the inside of the lower body,
Characterized in that the wire rope moves up and down through the upper body and the joint member during bending and restoration of the lower body
Leg unit for yard trailer.
According to claim 1,
The upper body,
an elevation plate movable up and down along the inner hollow of the upper body; and
A locking block that is in close contact with the lifting plate and is connected to one end of the wire rope;
Leg device for a yard trailer further comprising a.
According to claim 4,
The lifting plate,
Including; elevating plate body formed corresponding to the cross-sectional shape of the inner hollow of the upper body and movable along the inner hollow,
Characterized in that the inner center of the lifting plate body is provided with a first center hole through which the wire rope, one end of which is connected to the locking block, passes.
Leg unit for yard trailer.
According to claim 5,
The coil spring,
It is embedded in the longitudinal direction through the inner hollow of the upper body,
One end of the coil spring is constrainedly connected to the lifting plate,
Characterized in that the other end of the coil spring is positionally constrained to the lower end of the upper body
Leg unit for yard trailer.
According to claim 6,
The upper body,
a support protruding upward by a set length from the lower end of the upper body along the inner hollow;
Leg device for a yard trailer further comprising a.
According to claim 4,
The joint member,
A conical body having an upper end fixed to a lower portion of the upper body and a conical lower end,
The conical body has a second center hole through which the other end of the wire rope, one end of which is connected to the upper body, is drawn through,
The lower end of the conical body has a first sliding surface inclined downward from the outer end to the inner end close to the second center hole.
Leg unit for yard trailer.
According to claim 8,
The lower body,
a cylindrical housing in close contact with the lower portion of the joint member; and
a support plate coupled to cover the lower end of the cylindrical housing and supported in contact with the ground;
Leg device for a yard trailer comprising a.
According to claim 9,
a sliding member coupled to an upper end of the cylindrical housing and having a second sliding surface sliding along the first sliding surface of the conical body when the lower body is bent and restored;
Leg device for a yard trailer further comprising a.

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