Rotating ladder device convenient to operate

Abstract

The utility model relates to a rotating ladder device convenient to operate. The rotating ladder device comprises a ladder body, a rotating shaft, an opening and closing handrail assembly and an opening and closing handle assembly, the ladder body comprises an inverted L-shaped ladder frame and pedals which are mounted in the ladder frame and are arranged up and down; the middle part of the inner end of the upper transverse part of the ladder frame is rotationally connected with a vertically arranged rotating shaft, and the rotating shaft is connected with a shaft seat fixed below a chassis of a cab of the harvester, so that the rotating shaft part forms a rotating center of the ladder; the opening and closing handrail assembly comprises a corner bracket fixed on one side of the upper transverse part of the ladder frame, a rod sleeve of which the lower part is fixedly connected with the corner bracket, a pull rod arranged in the rod sleeve in a penetrating manner, and a lifting sleeve in driving connection with the upper end of the pull rod; the opening and closing handle assembly comprises a handle rod in driving connection with the lower end of the pull rod, a handle rod rotating shaft perpendicularly fixed to the middle section of the handle rod, a lock rod perpendicularly connected with a resistance rod section of the handle rod, and an elastic reset structure enabling the lock rod to be inserted into a lock hole in a cab chassis upwards. The device facilitates ladder transposition operation.

Description

Technical Field

[0001] The utility model belongs to the technical field of corn harvesters, and in particular relates to a rotating ladder device which is easy to operate. Background Art

[0002] In large agricultural machinery such as corn harvesters, since the cab is at a high distance from the bottom, it is necessary to equip an up-and-down ladder on one side of the cab. The up-and-down ladders on existing corn harvesters are of two types: fixed and rotary. The fixed up-and-down ladder is fixedly installed on one side of the cab, which will increase the width of the vehicle, which will have an adverse effect when meeting other vehicles on the road or harvesting in the farmland. The rotary up-and-down ladder can be fixed on one side of the cab when the driver is going up or down the ladder, and when the up-and-down ladder is not needed, the up-and-down ladder can be rotated to the lower front side of the cab, which will not have an adverse effect on the width of the vehicle.

[0003] The existing rotary up-and-down ladders are still insufficient in the convenience of operation when rotating and changing positions, and need to be further improved. Utility Model Content

[0004] The utility model aims to overcome the shortcomings of the prior art and provide a rotating ladder device which is easy to operate.

[0005] The above-mentioned purpose of the utility model is achieved through the following technical solutions:

[0006] A conveniently operated rotating ladder device, characterized in that it comprises a ladder body, a rotating shaft, an opening and closing handrail assembly, and an opening and closing handle assembly;

[0007] The ladder body comprises an inverted L-shaped ladder frame and pedals installed in the ladder frame; a vertically arranged rotating shaft is rotatably connected to the middle of the inner end of the upper horizontal part of the ladder frame, and the rotating shaft is connected to the shaft seat fixed below the chassis of the harvester cab, so that the rotating shaft portion constitutes the rotation center of the ladder;

[0008] The opening and closing handrail assembly includes an angle bracket, a rod sleeve, a pull rod, and a lifting sleeve; the angle bracket is fixedly installed on one side of the upper horizontal part of the ladder frame, and the lower end of the rod sleeve is fixedly connected to the inner wall of the angle bracket; the pull rod is inserted into the rod sleeve, and the lifting sleeve is slidably mounted on the upper end of the rod sleeve, and the lifting sleeve is driven and connected to the upper end of the pull rod by bolts passing through oblong holes arranged on both sides of the rod sleeve, and the lower end of the pull rod extends out from the lower end of the rod sleeve;

[0009] The opening and closing handle assembly includes a handle bar, a handle bar rotating shaft, a locking rod and an elastic reset structure; the handle bar is composed of a power rod section, an intermediate rod section and a resistance rod section, the intermediate rod section is vertically fixedly connected to the handle bar rotating shaft, the handle bar rotating shaft is rotatably installed on the shaft frame in the upper cross section of the ladder frame, and constitutes the rotation center of the handle bar, the power rod section is drivingly connected to the lower end of the pull rod, the resistance rod section is drivingly connected to the locking rod arranged in the up and down directions, a through hole for the upper end of the locking rod to extend out is provided at the top of the upper cross section of the ladder frame, and a first locking hole and a second locking hole cooperating with the locking rod are provided on the chassis of the harvester cab; the elastic reset structure is installed inside the upper cross section of the ladder frame, and is connected to the resistance rod section in a manner of applying an upward elastic pulling force;

[0010] When the ladder is placed in the use position outside the cab, the upper end of the locking rod forms an insertion locking fit with the first locking hole;

[0011] When the ladder is placed in the retracted position at the front side of the bottom of the cab, the upper end of the locking rod forms an insertion and locking fit with the second locking hole.

[0012] Moreover, a handrail is fixedly installed at the middle and upper positions of the left and right sides of the ladder frame respectively.

[0013] Moreover, the lower part of the pulling sleeve is provided with bolt insertion holes for inserting radial bolts, and the upper part is provided with an annular handholding groove.

[0014] Moreover, the pull rod is an oblong ring-shaped pull rod with closed ends formed by bending steel wire; the bolt connecting the pulling sleeve is inserted into the upper inner ring of the pull rod; the power rod section of the handle rod is inserted into the lower inner ring of the pull rod, and handle through holes are provided on both sides of the angle bracket for the power rod section of the handle rod to pass through.

[0015] The advantages and positive effects of the utility model are:

[0016] The utility model connects the rotating shaft at the inner end of the upper horizontal part of the ladder frame with the lower part of the cab chassis to form a rotating center, so that the rotation of the ladder can be realized. By adopting the matching structure of the opening and closing handhold rod device and the opening and closing handle assembly, a lever-type structure is driven by the pull rod to realize unlocking of the ladder at two locking hole positions, and the ladder is automatically locked at the two locking hole positions through the elastic reset structure. During the unlocking operation, the driver only needs to pull the lifting sleeve upwards to realize unlocking, which has the advantages of convenient operation and labor saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a front view of the rotating ladder device of the present invention;

[0018] Figure 2 is a side view of the rotating ladder device of the present invention;

[0019] Figure 3 The three-dimensional structure of the rotating ladder device of the present invention Figure 1 ;

[0020] Figure 4 The three-dimensional structure of the rotating ladder device of the present invention Figure 2 ;

[0021] Figure 5 It is an overall diagram of the assembly of the opening and closing handrail of the present invention;

[0022] Figure 6 yes Figure 5 A partial enlarged view of the upper section of the central opening and closing handrail assembly;

[0023] Figure 7 yes Figure 5 A partial enlarged view of the lower part of the middle opening and closing handrail assembly;

[0024] Figure 8 It is a schematic diagram of the coordination between the rotating ladder device of the present invention and the harvester cab chassis in the use position;

[0025] Fig. 9 It is a schematic diagram of the cooperation between the rotating ladder device of the present invention and the harvester cab chassis in the retracted position. DETAILED DESCRIPTION

[0026] The structure of the utility model is further described below with reference to the accompanying drawings and through embodiments. It should be noted that the embodiments are descriptive rather than restrictive.

[0027] A convenient ladder device, see Figure 1-Figure 9 The invention point is: it includes a ladder body 1, a rotating shaft 5, an opening and closing handrail assembly 3, and an opening and closing handle assembly 4.

[0028] The ladder body mainly includes an inverted L-shaped ladder frame 1.1 and a pedal 1.3. The pedal is fixed in the ladder frame at a certain interval up and down. A vertical shaft sleeve 1.2 is provided in the middle of the end of the upper horizontal part of the ladder frame, and the rotating shaft is installed in the vertical shaft sleeve. The rotating shaft is connected to the shaft seat fixed under the chassis 6 of the harvester cab, so that the rotating shaft constitutes the rotation center of the ladder. Furthermore, handrails 2 are provided on both sides of the ladder frame. The two handrails are fixedly installed at the middle and upper positions of the left and right sides of the ladder frame by welding or the like. The setting of the handrails improves the safety of going up and down the ladder. The structural form of the pedal and the structural form of the handrails on both sides are not limited.

[0029] The opening and closing handrail assembly cooperates with the opening and closing handle assembly to realize the locking and unlocking control of the ladder body.

[0030] The opening and closing handrail device includes an angle bracket 3.3, a rod sleeve 3.2, a pull rod 3.4, and a lifting sleeve 3.1. The angle bracket is fixedly installed on one side of the upper horizontal part of the ladder frame by welding or bolt connection. A vertical installation cavity for inserting the rod sleeve is formed between the angle bracket and the corresponding side of the upper horizontal part of the ladder frame. The lower end of the rod sleeve is inserted into the vertical installation cavity and fixedly connected to the inner wall surface of the angle bracket by welding or other means. The upper end of the rod sleeve extends to the top of the ladder body. The pull rod is preferably an oblong annular pull rod with closed ends formed by bending steel wire. The pull rod is installed in the inner cavity of the rod sleeve in a clearance fit manner. The lower end of the pull rod extends from the lower end of the rod sleeve. A radial bolt 3.5 is installed in the inner ring of the upper end of the pull rod. The radial bolt passes through the oblong holes 3.2.1 set on both sides of the upper end of the rod sleeve and is fixedly connected to the lifting sleeve sleeved outside the rod sleeve. The lower part of the lifting sleeve is provided with bolt insertion holes for inserting radial bolts, and the upper part is provided with an annular handholding groove.

[0031] In the above structure, handle through holes 3.3.1 are provided on both sides of the angle bracket below the fixed rod sleeve, and the size of the handle through holes along the vertical direction needs to meet the vertical movement stroke requirement of the handle in the assembly of the opening and closing handle.

[0032] The opening and closing handle assembly includes a handle bar 4.1, a handle bar rotating shaft 4.3, a lock bar 4.6 and an elastic reset structure. The handle bar is composed of a power bar section 4.1.1, an intermediate bar section 4.1.2 and a resistance bar section 4.1.3, and is nearly Z-shaped as a whole. The power bar section is installed in the handle through holes on both sides of the angle frame and is installed with the lower ring end of the pull rod. The intermediate bar section is inserted into the through hole set on the corresponding side of the upper horizontal part of the ladder frame and then extends into the interior of the upper horizontal part of the ladder frame. The handle bar rotating shaft is vertically arranged on the intermediate bar section and is provided by welding or the like. Specifically, a connecting plate 4.2 can be welded on the intermediate bar section, and the handle bar rotating shaft is welded on the back of the connecting plate. The two ends of the handle bar rotating shaft are rotatably mounted on the shaft frame in the upper horizontal part of the ladder frame. The end of the resistance bar section is vertically fixedly connected to the lock bar, and the lock bar is installed on the inner side wall of the upper horizontal part of the ladder frame in a sliding manner, which can be achieved by setting a guide hole on the inner side wall. A through hole is provided at the top of the upper horizontal portion of the ladder frame for the upper end of the locking rod to extend out. A first locking hole and a second locking hole (not shown in the attached drawings) are provided on the harvester cab chassis. The first locking hole is used to lock the ladder by inserting and cooperating with the upper end of the locking rod when the ladder body is rotated to the side position of the cab (the position for the driver to get on or off the ladder). The second locking hole is used to lock the ladder by inserting and cooperating with the upper end of the locking rod when the ladder body is rotated to the front position of the cab chassis.

[0033] The elastic reset mechanism includes a tension spring 4.5 and a tension spring seat 4.4, wherein the tension spring seat is fixedly mounted on the top inner wall of the upper cross section of the ladder frame, the upper end of the tension spring is connected to the tension spring seat, and the lower end of the tension spring is connected to the resistance rod section, applying an upward pulling force to the rod section. The upper end of the locking rod is inserted into the lock hole through the elastic reset mechanism.

[0034] The working principle of this conveniently operated ladder device is:

[0035] When the driver needs to go up or down the ladder, the ladder is placed outside the cab. Under the action of the tension spring in the elastic reset mechanism, the upper end of the locking rod is inserted into the first locking hole to fix the ladder in the use position. When the driver is in the car and needs to retract the ladder, the hand-held lifting sleeve pulls the pull rod upward, and the lower end of the pull rod drives the power rod section to lift up. Based on the lever principle, the resistance rod section moves downward, driving the locking rod downward, so that the upper end of the locking rod retracts into the ladder frame and disengages from the first locking hole. At this time, the ladder body can be rotated around the rotating shaft to rotate the ladder body to the front position. After rotating into place, release the lifting sleeve, and under the action of the elastic reset mechanism, the other end of the handle rod is driven upward, thereby driving the locking rod upward, so that the upper end of the locking rod is inserted into the second locking hole, and the ladder is fixed in the retracted position. The operation process of adjusting from the retracted position to the use position refers to the above-mentioned process of adjusting from the use position to the retracted position, which will not be repeated here.

[0036] Although the embodiments and drawings of the present invention are disclosed for illustrative purposes, those skilled in the art will appreciate that various substitutions, changes and modifications are possible without departing from the spirit of the present invention and the appended claims. Therefore, the scope of the present invention is not limited to the contents disclosed in the embodiments and drawings.

Claims

1. A conveniently operated staircase device, characterized in that: It includes a ladder body, a rotating shaft, an opening and closing handrail assembly, and an opening and closing handle assembly; The ladder body comprises an inverted L-shaped ladder frame and pedals fixedly installed in the ladder frame; a vertically arranged rotating shaft is rotatably connected to the middle of the inner end of the upper horizontal part of the ladder frame, and the rotating shaft is connected to the shaft seat fixed under the chassis of the harvester cab, so that the rotating shaft portion constitutes the rotation center of the ladder; The opening and closing handrail assembly includes an angle bracket, a rod sleeve, a pull rod, and a lifting sleeve; the angle bracket is fixedly installed on one side of the upper horizontal part of the ladder frame, and the lower end of the rod sleeve is fixedly connected to the inner wall of the angle bracket; the pull rod is inserted into the rod sleeve, and the lifting sleeve is slidably mounted on the upper end of the rod sleeve, and the lifting sleeve is driven and connected to the upper end of the pull rod by bolts passing through oblong holes arranged on both sides of the rod sleeve, and the lower end of the pull rod extends out from the lower end of the rod sleeve; The opening and closing handle assembly includes a handle bar, a handle bar rotating shaft, a locking rod and an elastic reset structure; the handle bar is composed of a power rod section, an intermediate rod section and a resistance rod section, the intermediate rod section is vertically fixedly connected to the handle bar rotating shaft, the handle bar rotating shaft is rotatably installed on the shaft frame in the upper cross section of the ladder frame, and constitutes the rotation center of the handle bar, the power rod section is drivingly connected to the lower end of the pull rod, the resistance rod section is drivingly connected to the locking rod arranged in the up and down directions, a through hole for the upper end of the locking rod to extend out is provided at the top of the upper cross section of the ladder frame, and a first locking hole and a second locking hole cooperating with the locking rod are provided on the chassis of the harvester cab; the elastic reset structure is installed inside the upper cross section of the ladder frame, and is connected to the resistance rod section in a manner of applying an upward elastic pulling force; When the ladder is placed in the use position outside the cab, the upper end of the locking rod forms an insertion locking fit with the first locking hole; When the ladder is placed in the retracted position at the front side of the bottom of the cab, the upper end of the locking rod forms an insertion and locking fit with the second locking hole.

2. The conveniently operated rotating ladder device according to claim 1, characterized in that: A handrail is fixedly installed at the middle and upper positions of the left and right sides of the ladder frame respectively.

3. The conveniently operated rotating ladder device according to claim 1, characterized in that: The lower part of the lifting sleeve is provided with bolt insertion holes for inserting radial bolts, and the upper part is provided with an annular handholding groove.

4. The conveniently operated rotating ladder device according to claim 1, characterized in that: The pull rod is an oblong ring-shaped pull rod with closed ends formed by bending steel wire; the bolt connecting the pulling sleeve is inserted into the upper inner ring of the pull rod; the power rod section of the handle rod is inserted into the lower inner ring of the pull rod, and handle through holes are provided on both sides of the angle bracket for the power rod section of the handle rod to pass through.

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