Pull-out boarding ladder

Abstract

The present invention discloses a pull-out boarding ladder arranged at the lower side of the rear end of a transport platform, comprising a fixed frame, a pull-out ladder frame and a storage and locking device for the pull-out ladder frame. The fixed frame is fixed at the lower side of the rear end of the vehicle platform, and the two sides of the pull-out ladder frame are movably embedded and stored in the fixed frame. The storage and locking device for the pull-out ladder frame is arranged between the lower side of the middle part of the front cross beam of the fixed frame and the front limit tube of the pull-out ladder frame. When the pull-out ladder frame is stored and locked, the door-shaped locking rod is vertically upward against the middle part of the front limit tube; when the pull-out ladder frame is pulled out for use, the bottoms of the two inclined ladder frame side beams are respectively supported on the ground, and the door-shaped locking rod is vertically downward. The present invention has a compact structure and is easy to use, and ensures the driving safety of the vehicle. The boarding ladder can be quickly deployed and used and quickly stored and locked, thereby improving the operating efficiency of special vehicles.

Description

Technical Field

[0001] The invention relates to a boarding device for a vehicle-mounted cabin or a van, in particular to a boarding device which can be quickly pulled out for use and quickly stored under a transport platform, and belongs to the technical field of vehicle accessories. Background Art

[0002] Special vehicles are specialized vehicles used for field operations, communication command and logistics support. The carrying platform is loaded with a cabin or compartment. The special equipment installed in the cabin or compartment requires professional personnel to operate, and the equipment and personnel enter and exit the cabin or compartment through the cabin door. The height of the cabin door from the ground is generally around 1100mm, and a cabin ladder needs to be installed on the vehicle. However, the installation of the cabin ladder requires installation space, and it also needs to be set up separately when in use. When the vehicle is driving, the cabin ladder also needs to be fixed to the cabin or compartment. Installing and disassembling the fixed cabin ladder is time-consuming and laborious, and it is impossible to quickly deploy and use the cabin ladder or quickly store and lock it. Summary of the invention

[0003] The object of the present invention is to provide a pull-out cabin ladder which has a compact structure, is easy to operate, can be quickly pulled out for use, and can also be quickly stored and locked under a vehicle platform.

[0004] The present invention is achieved through the following technical solutions:

[0005] A pull-out boarding ladder is arranged at the lower side of one end of a transport platform and corresponds to the position of a hatch of a vehicle-mounted cabin; it comprises a fixed frame, a pull-out ladder frame and a pull-out ladder frame storage locking device, the two sides of the pull-out ladder frame are movably embedded and stored in the fixed frame, the fixed frame comprises side beam guide rails on both sides of the longitudinal direction, as well as a front cross beam, a rear cross beam, a pair of front limit seats, a pair of rear limit seats and a pair of front support seats, the cross sections of the front cross beam and the rear cross beam are both L-shaped, and the front cross beam The front and rear cross beams are respectively fixed vertically at the lower sides of both ends of the side beam guide rails; the front limit seats are respectively welded and fixed to the outer sides of the front ends of the side beam guide rails, and the rear limit seats are respectively welded and fixed to the rear ends of the side beam guide rails. The upper sides of the front limit seats and the upper sides of the rear limit seats are respectively fixed to the lower sides of one end of the transport platform, and the front support seats are respectively welded and fixed to the lower sides of the front ends of the side beam guide rails; the pull-out ladder rack storage locking device is arranged between the lower middle side of the front cross beam near one end of the transport platform and one end of the pull-out ladder rack.

[0006] The purpose of the present invention can be further achieved by the following technical measures.

[0007] Furthermore, the pull-out ladder frame includes ladder frame side beams on both sides, several reversible pedals, several pairs of pedal support blocks, a front limit tube, a rear limit tube and a pair of rollers, and the two ends of the ladder frame side beams are respectively fixedly connected to the two ends of the front limit tube and the two ends of the rear limit tube to form a rectangular frame; the cross-section of the ladder frame side beam is L-shaped, and several reversible pedals arranged at intervals are horizontally placed in a pair of ladder frame side beams, and the two ends of the reversible pedals are respectively hinged to the corresponding ladder frame side beams through hinge shafts; the pedal support block is close to the hinge shaft, and one end of the pedal support block is welded The rollers are supported on one end of the support shaft, and the other ends of the support shafts are respectively fixed on the L-shaped vertical side ends of the corresponding ladder frame side beams, and are respectively located on the outsides of the corresponding ladder frame side beams; the roller treads are respectively supported on the side beam guide rails corresponding to the fixed frame; when the pull-out ladder frame is pulled out for use, the reversible pedal is flipped clockwise until the two ends of the bottom surface of the reversible pedal are respectively against the other end of the corresponding pedal support block; when the pull-out ladder frame is stored, the reversible pedal is flipped counterclockwise to the inside of the ladder frame side beam.

[0008] Furthermore, the drawable ladder rack storage locking device is arranged between the lower middle part of the front crossbeam of the fixed frame and the front limit tube of the drawable ladder rack, and includes a compression spring, a supporting T-bar and a door-type locking rod. The middle part of the straight rod of the supporting T-bar passes through the middle part of the vertical edge of the front crossbeam, the compression spring is sleeved on the straight rod of the supporting T-bar, and the two ends of the compression spring respectively abut between the inner side of the vertical edge of the front crossbeam and the rear baffle, and one end of the straight rod passes through the rear baffle, and the supporting T-bar is limited by a split pin; the middle part of the crossbar of the supporting T-bar is vertically fixedly connected with the two ends of the door-type locking rod; when the drawable ladder rack is stored and locked, the door-type locking rod is vertically upward and abuts against the middle part of the front limit tube of the drawable ladder rack; when the drawable ladder rack is pulled out for use, the bottoms of the two inclined ladder rack side beams are respectively supported on the ground; the door-type locking rod is vertically downward. The upper part of the door-type locking rod is arc-shaped, and the radius of the arc matches the radius of the front limit tube of the drawable ladder rack.

[0009] Furthermore, the cross section of the pedal support block is a hollow right triangle, and the end face and the bottom side of the hollow right triangle are respectively fixed on the two right-angled sides of the L-shape of the ladder frame side beam at corresponding positions.

[0010] Furthermore, the front support seat is an obtuse triangle. When the pull-out ladder frame is pulled out for use, the upper ends of the inclined ladder frame side beams respectively abut against the corresponding hypotenuses of the front support seat, and the lower ends of the ladder frame side beams are supported on the ground.

[0011] The present invention has a compact structure and is easy to use. The fixed frame is fixed to the lower side of the rear end of the vehicle platform, and the two sides of the pull-out ladder frame are movably embedded and stored in the fixed frame. The pull-out ladder frame storage locking device is arranged between the lower side of the middle part of the front cross beam of the fixed frame and the front limit tube of the pull-out ladder frame. The present invention uses the elastic force of the compression spring to press the inner side of the arc-shaped upper part of the door-shaped locking rod onto the front limit tube of the pull-out ladder frame, so that the pull-out ladder frame can be reliably stored and locked in the fixed frame, ensuring the driving safety of the vehicle. The present invention does not occupy the precious space of the vehicle-mounted cabin or the box-type car body, realizes the rapid deployment and use and rapid storage and locking of the cabin ladder, and improves the operating efficiency of special vehicles.

[0012] Advantages and features of the present invention will be illustrated and explained by the following non-restrictive description of preferred embodiments thereof, which are given by way of example only with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a state diagram of the present invention;

[0014] Figure 2 yes Figure 1 A top view of

[0015] Figure 3 It is an enlarged view of the collection state of the present invention;

[0016] Figure 4 yes Figure 3 Top view of the . DETAILED DESCRIPTION

[0017] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0018] In the description of the present invention, terms indicating orientation or position, such as "front", "rear", "up", "down", "left" and "right", are based on the orientation shown in the drawings, wherein "front" is the right side of the drawings and "rear" is the left side of the drawings, and are only used to simplify the description, and do not indicate or imply that the present invention must have a specific orientation or position.

[0019] like Figure 1 to Figure 4As shown, the present invention is arranged at the lower right side of the transport platform 10, and corresponds to the position of the hatch of the vehicle-mounted cabin. It includes a fixed frame 1, a pull-out ladder frame 2 and a pull-out ladder frame storage locking device 3. The pull-out ladder frame 2 is movably embedded and stored in the fixed frame 1 on both sides. The fixed frame 1 includes side beam guide rails 11 on both sides of the longitudinal direction, as well as a front cross beam 12, a rear cross beam 13, a pair of front limit seats 14, a pair of rear limit seats 15 and a pair of front support seats 16. The cross sections of the front cross beam 12 and the rear cross beam 13 are both L-shaped. The front cross beam 12 and the rear cross beam 13 are respectively fixed vertically on the lower sides of the two ends of the side beam guide rail 11. The front limit seats 14 are respectively welded and fixed to the outer side of the front end of the side beam guide rail 11, and the rear limit seats 15 are respectively welded and fixed to the rear end of the side beam guide rail 11. The front limit seats 14 and the rear limit seats 15 can prevent the pull-out ladder frame 2 from detaching from the side beam guide rail 11. The front support seats 16 are respectively welded and fixed to the lower side of the front end of the side beam guide rail 11, which are in the shape of an obtuse triangle. When the pull-out ladder frame 2 is pulled out for use, the upper ends of the inclined ladder frame side beams 11 respectively abut against the corresponding hypotenuse 161 of the front support seats 16, and the lower ends of the ladder frame side beams 11 abut against the ground for support, so that the upper and lower ends of the pull-out ladder frame 2 are supported stably, ensuring the safety of people boarding the vehicle.

[0020] The pull-out ladder frame 2 includes ladder frame side beams 21 on both sides, three reversible pedals 22, three pairs of pedal support blocks 23, a front limit tube 24, a rear limit tube 25 and a pair of rollers 26. The two ends of the ladder frame side beam 21 of the pull-out ladder frame 2 are respectively welded to the front limit tube 24 and the rear limit tube 25 to form a rectangular frame. The cross section of the ladder frame side beam 21 is L-shaped, and the three reversible pedals 22 arranged at intervals are horizontally placed in a pair of ladder frame side beams 21. The two ends of the reversible pedals 22 are respectively hinged to the corresponding ladder frame side beams 21 through hinge shafts 27. The pedal support block 23 is close to the hinge shaft 27, and the cross section of the pedal support block 23 is a hollow right triangle. The end face and the bottom side of the hollow right triangle are respectively welded and fixed to the two right angle sides of the L shape of the ladder frame side beam 21 at the corresponding position, that is, on the inner side of the ladder frame side beam 21. The roller 26 is supported on one end of the support shaft 28, and the other end of the support shaft 28 is respectively fixed to the end of the L-shaped vertical side 211 of the corresponding ladder frame side beam 21, and is respectively located on the outside of the corresponding ladder frame side beam 21. The treads of the roller 26 are respectively supported on the side beam guide rails 11 corresponding to the fixed frame 1. The roller 26 makes it easier and more convenient to pull out or push the pull-out ladder frame 2 into the fixed frame 1. When the pull-out ladder frame 2 is pulled out for use, the reversible pedal 22 is turned clockwise until the two ends of its bottom surface are respectively against the other end of the corresponding pedal support block 23, so that the reversible pedal 22 is reliably supported to ensure the safety of personnel getting on and off the cabin. When the pull-out ladder frame 2 is stored, the reversible pedal 22 is turned counterclockwise to the inside of the ladder frame side beam 21, so that the pull-out ladder frame 2 can be pushed into the fixed frame 1.

[0021] The drawable ladder rack storage locking device 3 is arranged between the lower middle part of the front cross beam 12 of the fixed frame 1 and the front limit tube 24 of the drawable ladder rack 2, and includes a compression spring 31, a supporting T-bar 32 and a door-type locking rod 33. The middle part of the straight rod 321 supporting the T-bar 32 passes through the middle part of the vertical edge 121 of the front cross beam, and the compression spring 31 is sleeved on the straight rod 321 supporting the T-bar 32. The two ends of the compression spring 31 respectively abut between the inner side of the vertical edge 121 of the front cross beam and the rear baffle 34. One end of the straight rod 321 passes through the rear baffle 34, and the supporting T-bar 32 is limited by the cotter pin 35. The middle part of the cross bar 322 supporting the T-bar 32 is vertically welded and fixed to the two ends of the door-type locking rod 33. Figure 1 and Figure 3 As shown, the upper portion of the door-shaped locking rod 33 is arc-shaped, and the radius of the arc matches the radius of the front limit tube 24 of the pull-out ladder frame 2. When the pull-out ladder frame 2 is stowed and locked, the door-shaped locking rod 33 is vertically upward and rests on the middle portion of the front limit tube 24 of the pull-out ladder frame 2, completely restricting the front limit tube 24, ensuring that the pull-out ladder frame 2 can be firmly locked when the vehicle is driving.

[0022] When the present invention is used, it is only necessary to first pull out the door-shaped locking rod 33, so that the arc-shaped upper part thereof overcomes the elastic force of the compression spring 31 and is separated from the front limit tube 24 of the pull-out ladder frame 2, and the supporting T-shaped rod 32 can be rotated 180° around the axis of the straight rod 321, and the door-shaped locking rod 33 is vertically downward, so that the pull-out ladder frame 2 is unlocked, and the pull-out ladder frame 2 can be pulled out for use. When the pull-out ladder frame 2 is stored, it is only necessary to flip the pull-out ladder frame 2 to a horizontal state, and then push the pull-out ladder frame 2 toward the fixed frame 1. Under the guidance of the side beam guide rail 11, a pair of rollers 26 at the end of the pull-out ladder frame 2 roll along the side beam guide rails 11 on both sides of the fixed frame 1, and the pull-out ladder frame 2 is pushed into the fixed frame 2, and then the door-shaped locking rod 33 is pulled again, and the supporting T-shaped rod 32 is rotated 180° around the axis of the straight rod 321, so that the door-shaped locking rod 33 is vertically upward. The door-shaped locking rod 33 is released, and under the action of the restoring elastic force of the compression spring 31, the inner side of the arc-shaped upper part of the door-shaped locking rod 33 is pressed against the front limit tube 24 of the pull-out ladder frame 1, and the pull-out ladder frame 1 is reliably locked to ensure the safety of vehicle driving.

[0023] In addition to the above embodiments, the present invention may also have other implementation modes. Any technical solutions formed by equivalent replacement or equivalent transformation shall fall within the protection scope required by the present invention.

Claims

1. A pull-out boarding ladder, wherein the pull-out boarding ladder is arranged at the lower side of one end of the transport platform and corresponds to the position of the hatch door of the vehicle-mounted cabin; it comprises a fixed frame, a pull-out ladder frame and a pull-out ladder frame storage locking device, wherein both sides of the pull-out ladder frame are movably embedded and stored in the fixed frame, and the fixed frame comprises side beam guide rails on both sides in the longitudinal direction, as well as a front cross beam, a rear cross beam, a pair of front limit seats, a pair of rear limit seats and a pair of front support seats, the cross sections of the front cross beam and the rear cross beam are both L-shaped, and the front cross beam and the rear cross beam are respectively vertically fixed to the lower sides of both ends of the side beam guide rails; the front limit seats are respectively welded and fixed to the outer sides of the front ends of the side beam guide rails, the rear limit seats are respectively welded and fixed to the rear ends of the side beam guide rails, the upper sides of the front limit seats and the upper sides of the rear limit seats are respectively fixed to the lower side of one end of the transport platform, and the front support seats are respectively welded and fixed to the lower sides of the front ends of the side beam guide rails; the pull-out ladder frame storage locking device is arranged between the lower side of the middle part of the front cross beam near one end of the transport platform and one end of the pull-out ladder frame; The pull-out ladder frame includes ladder frame side beams on both sides, several reversible pedals, several pairs of pedal support blocks, a front limiting tube, a rear limiting tube and a pair of rollers. The two ends of the ladder frame side beams are respectively fixedly connected to the two ends of the front limiting tube and the two ends of the rear limiting tube to form a rectangular frame; the cross-section of the ladder frame side beam is L-shaped, and several reversible pedals arranged at intervals are horizontally placed in a pair of ladder frame side beams, and the two ends of the reversible pedals are respectively hinged to the corresponding ladder frame side beams through hinge shafts; the pedal support block is close to the hinge shaft, and one end of the pedal support block is welded and fixed The roller is fixed on the inner side of the corresponding ladder frame side beam; the roller is supported on one end of the support shaft, and the other end of the support shaft is respectively fixed on the L-shaped vertical side end of the corresponding ladder frame side beam, and is respectively located on the outer side of the corresponding ladder frame side beam; the roller treads are respectively supported on the side beam guide rails corresponding to the fixed frame; when the pull-out ladder frame is pulled out for use, the reversible pedal is turned clockwise until the two ends of the bottom surface of the reversible pedal are respectively against the other end of the corresponding pedal support block; when the pull-out ladder frame is stored, the reversible pedal is turned counterclockwise to the inside of the ladder frame side beam; Features: The drawable ladder rack storage locking device is arranged between the lower middle part of the rear cross beam of the fixed frame and the front limit tube of the drawable ladder rack, and comprises a compression spring, a supporting T-bar and a door-type locking rod. The middle part of the straight rod of the supporting T-bar passes through the middle part of the vertical edge of the front cross beam, and the compression spring is sleeved on the straight rod of the supporting T-bar, and the two ends of the compression spring respectively abut between the inner side surface of the vertical edge of the front cross beam and the rear baffle, and one end of the straight rod passes through the rear baffle, and the supporting T-bar is limited by a cotter pin; the middle part of the cross bar of the supporting T-bar is vertically fixedly connected with the two ends of the door-type locking rod; when the drawable ladder rack is stored and locked, the door-type locking rod is vertically upward and abuts against the middle part of the front limit tube of the drawable ladder rack; when the drawable ladder rack is pulled out for use, the bottoms of the two inclined ladder rack side beams are respectively supported on the ground; the door-type locking rod is vertically downward; The upper part of the door-shaped locking rod is arc-shaped, and the radius of the arc matches the radius of the front limiting tube of the pull-out ladder rack.

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