CN209225031U - Upper rail can folding-jib moveable vertical hoisting mechanism - Google Patents

Abstract

Upper rail can folding-jib moveable vertical hoisting mechanism, it is related to hoisting technology field, it includes the left rail of fixed setting, hinged right guide rail and the adjustable shelf of left rail is slidably connected to left rail, right guide rail can downwardly turn over or flush to be connected to the two with left rail holding, adjustable shelf is equipped with rolling-up mechanism, rolling-up mechanism includes speed reducer, the winding bar being connect with speed reducer drive and the telescopic band that can be got up by the winding of winding bar, one end of telescopic band is fixedly connected with winding bar, the other end can extend downward vertically and for articles, speed reducer drive is connected with power device, the bottom of right guide rail is connected with support rod, support rod includes and the right hinged upper rack posts in guide rail bottom and the lower fulcrum bar hinged with upper rack posts, the bottom end of lower fulcrum bar and the first fixing piece are hinged.The utility model is mountable in compartment or shelter, and can quickly, easily load and unload to cargo.

Description

Upper rail can folding-jib moveable vertical hoisting mechanism

Technical field

The utility model relates to hoisting technology fields, and especially a kind of upper rail can folding-jib moveable vertical hoisting mechanism.

Background technique

Currently, van generallys use electri forklift to carry out the loading or unloading of cargo, the efficiency of loading and unloading is general, manually It drives and the process of operation fork truck also needs to expend many energy；Moreover, for some special vehicles with shelter For, due to being frequently necessary to work in the outdoor place such as field, campsite, at this moment needing handling goods just seems very Trouble can only carry out handling goods by manpower substantially, not only expend strength, can also waste nervous valuable time.

Utility model content

Problem to be solved in the utility model be to provide a kind of upper rail can folding-jib moveable vertical hoisting mechanism, It is mountable in compartment or shelter, and can quickly, easily cargo be loaded and unloaded.

In order to solve the above-mentioned technical problem, the utility model adopts the following technical solution: a kind of upper rail can folding-jib it is living Dynamic vertical lifting mechanism, left rail including fixed setting hinged right guide rail and are slidably connected to left rail with left rail Adjustable shelf, the right guide rail can downwardly turn over or flush both to make to be connected to left rail holding, the activity Frame can move back and forth therebetween when left rail is flushed with the holding of right guide rail, and the adjustable shelf is equipped with rolling-up mechanism, institute Rolling-up mechanism is stated to include speed reducer, the winding bar connecting with speed reducer drive and the telescopic band of getting up can be wound by winding bar, Bar is fixedly connected, the other end can extend downward vertically and is used for articles, the deceleration with winding for one end of the telescopic band Machine is sequentially connected with power device, and the bottom of the right guide rail is connected with support rod, and the support rod includes and right guide rail bottom Hinged upper rack posts and the lower fulcrum bar hinged with upper rack posts, the bottom end of the lower fulcrum bar and the first fixing piece are hinged, the branch Strut, which is equipped with, can keep upper rack posts and lower fulcrum bar is in the limit control mechanism of unfolded state, when the upper rack posts and lower fulcrum bar are in exhibition When open state, the support rod flushes right guide supporting to left rail holding, when the upper rack posts and lower fulcrum bar folding, The right guide rail can downwardly turn over folding.

Further, the adjustable shelf is connected with the driving mechanism for driving it to move on left rail and right guide rail.

Wherein, the driving mechanism includes the first telescoping cylinder, the telescopic folding bracket connecting with the first telescoping cylinder, described to stretch The piston rod of the left end of contracting folding rack and the first telescoping cylinder is hinged, right end and adjustable shelf are hinged, and first telescoping cylinder can band Dynamic telescopic folding bracket is unfolded to the right or to left folding, to make the adjustable shelf to the right or be moved to the left.

Preferably, the power device includes the motor with the transmission connection of the input shaft of speed reducer.

It is highly preferred that the limit control mechanism includes the second telescoping cylinder, the bottom end of second telescoping cylinder is solid with second Determine that part is hinged, one end of the piston rod of second telescoping cylinder and the left side of lower fulcrum bar are hinged, the work of second telescoping cylinder Stopper rod when extending can lower fulcrum bar described in ejection to the right so that the upper rack posts and lower fulcrum bar are in unfolded state, and then by institute Right guide supporting is stated, the piston rod of second telescoping cylinder can pull lower fulcrum bar when shrinking to the left, so that on described Strut drives right guide rail to downwardly turn over folding.

Or as another preferred mode, the power device includes shaking with what the input shaft of speed reducer was sequentially connected Fixed handle.

It is highly preferred that the limit control mechanism includes that upper rack posts bottom is arranged in and can live along the length direction of upper rack posts Dynamic Elastic buckle and the latch being fixed at the top of lower fulcrum bar, are connected with pressure between the Elastic buckle and upper rack posts The upper end of contracting spring, the Elastic buckle is protruded outward from upper rack posts, when the upper rack posts are in unfolded state with lower fulcrum bar, The lower end of the Elastic buckle can be caught in latch downwards to limiting upper rack posts and lower fulcrum bar folding, at this time the compressed spring In compressive state, the upper end of the Elastic buckle is dialed up, the lower end of the Elastic buckle can be made to exit from latch, this Shi Suoshu compressed spring is further compressed, and folding may be reversed in the upper rack posts and lower fulcrum bar.

Wherein, the bottom of the Elastic buckle and the top of latch are equipped with the inclined-plane matched, when the upper rack posts to When upper fold, the bottom bevel of the Elastic buckle can be slided against the top bevel of latch, and make the compressed spring quilt Further compression, after the bottom bevel of the Elastic buckle and the top bevel of latch disengage, the upper rack posts with Lower fulcrum bar is in unfolded state, and the compressed spring pushes Elastic buckle to be caught in latch at this time.

Further, the right end of the adjustable shelf is equipped with locking member, and the right end of the right guide rail is connected with limit protection column, The bottom end on the limit protection column is equipped with limit hole, and the top of the locking member is upward through adjustable shelf and can be plugged into the limit Position hole in, bottom end be passed down through adjustable shelf and be fixedly connected with pulling block, be connected between the locking member and adjustable shelf in compression The locking spring of state pulls downward on the pulling block, and the top of the locking member can be made to exit from limit hole, and makes the lock Tight spring further compresses.

Wherein, the right side on the locking member top is equipped with inclined surface, when the adjustable shelf moves right, the locking member Inclined surface can collide limit protection column so that locking member itself moves down and compress locking spring, when the locking When part is aligned with limit hole, under the active force of the locking spring, the locking member can be caught in limit hole upwards.

The utility model has the beneficial effects that: left rail can be fixed to the top of compartment or shelter, load When cargo, support rod is unfolded, right guide rail can be supported, so as to which the length of guide rail is extended to compartment or shelter Adjustable shelf is moved to right guide rail at this time by outside, starts speed reducer, can be made winding bar that telescopic band be driven to extend downward vertically, be stretched The component of the settable suspension hook class in the bottom end of contracting band is for connecting cargo, and connecting cargo makes to wind bar reversion later, by telescopic band Winding upwards after object is lifted certain altitude, can make adjustable shelf be moved to the left a left side and lead so as to be lifted object upwards Rail, at this time putting down rolling-up mechanism, object directly can be put into compartment by object or shelter suffers, can after cargo loads Make support rod folding, upper rack posts then can drive right guide rail to downwardly turn over, so that right guide rail is also taken in compartment or shelter , save occupied space；When unloading cargo, support rod opened, rise right guide rail, make adjustable shelf after rolling-up mechanism connection cargo It is moved to right guide rail from left rail, then cargo can easily be unloaded by elongation telescopic band downward vertically, whole process is light Loose, convenient, the labor intensity of operator obtains the reduction of high degree, improves operating efficiency.

Detailed description of the invention

Fig. 1 is the overall structure diagram in the utility model embodiment 1；

Fig. 2 is partial structure diagram when mechanism is installed on compartment or shelter and uses in embodiment 1；

Fig. 3 is support rod and structural schematic diagram when right guide rail folding in embodiment 1；

Fig. 4 is the overall structure diagram in the utility model embodiment 2；

Fig. 5 is support rod and structural schematic diagram when right guide rail folding in embodiment 2；

Fig. 6 is the structural schematic diagram of the limit control mechanism in embodiment 2；

Fig. 7 is partial structure diagram when mechanism is installed on compartment or shelter and uses in embodiment 2；

Appended drawing reference are as follows:

1 --- left rail 2 --- right guide rail 3 --- adjustable shelf

4a --- speed reducer 4b --- winding bar 4c --- telescopic band

4d --- motor 5 --- support rod 5a --- upper rack posts

5b --- lower fulcrum bar 5c --- the first fixing piece 6a --- first telescoping cylinder

6b --- telescopic folding bracket 7 --- the second telescoping cylinder 7a --- second fixing piece

8a --- Elastic buckle 8b --- latch 9 --- locking member

9a --- pulling block 10 --- limit protection column 10a --- limit hole.

Specific embodiment

For the ease of the understanding of those skilled in the art, the utility model is made below with reference to embodiment and attached drawing further Explanation, the content that embodiment refers to not is restriction to the utility model.

It needs to illustrate in advance, in the present invention unless specifically defined or limited otherwise, term " installation ", The terms such as " connected ", " connection ", " fixation " shall be understood in a broad sense, for example, it may be being fixedly connected, be also possible to detachably connect It connects, or is integrally connected；It can be directly connected, can also can be inside two elements indirectly connected through an intermediary Connection.For the ordinary skill in the art, above-mentioned term can be understood in the utility model as the case may be In concrete meaning.

In addition, in the present invention unless specifically defined or limited otherwise, fisrt feature in second feature "upper" or "lower" may include that the first and second features directly contact, and also may include that the first and second features are not direct contacts but lead to Cross the other characterisation contact between them.Moreover, fisrt feature includes above the second feature " above ", " above " and " above " One feature is right above second feature and oblique upper, or is merely representative of first feature horizontal height higher than second feature.First is special Sign is directly below and diagonally below the second feature including fisrt feature under the second feature " below ", " below " and " below ", or only Indicate that first feature horizontal height is less than second feature.Term " on ", "lower", "front", "rear", "left", "right", "vertical", " water It is flat ", "top", "bottom" "inner", the instructions such as "outside" orientation or positional relationship be to be based on the orientation or positional relationship shown in the drawings, only It is the utility model and simplified description for ease of description, rather than the device or element of indication or suggestion meaning must have spy Fixed orientation is constructed and operated in a specific orientation, therefore should not be understood as limiting the present invention.

Embodiment 1

As shown in Figure 1-3, upper rail can folding-jib moveable vertical hoisting mechanism, left rail 1 including fixed setting, with it is left The hinged right guide rail 2 of guide rail 1 and the adjustable shelf 3 for being slidably connected to left rail 1, right guide rail 2 can downwardly turn over or with it is described The holding of left rail 1 flushes to be connected to the two, and adjustable shelf 3 can be when left rail 1 be flushed with the holding of right guide rail 2 therebetween Move back and forth, adjustable shelf 3 is equipped with rolling-up mechanism, and rolling-up mechanism includes speed reducer 4a, the winding with speed reducer 4a transmission connection One end of bar 4b and the telescopic band 4c that can be got up by winding bar 4b winding, telescopic band 4c are fixedly connected with winding bar 4b, are another End can extend downward vertically and for articles, and speed reducer 4a is sequentially connected with power device, and the bottom of right guide rail 2 is connected with Support rod 5, support rod 5 include with the right hinged upper rack posts 5a in 2 bottom of the guide rail and lower fulcrum bar 5b hinged with upper rack posts 5a, under The bottom end of strut 5b and the first fixing piece 5c are hinged, and support rod 5, which is equipped with, can keep upper rack posts 5a and lower fulcrum bar 5b in unfolded state Limit control mechanism, when upper rack posts 5a and lower fulcrum bar 5b is in unfolded state, support rod 5 is by the support of right guide rail 2 to leading with a left side The holding of rail 1 flushes, and as upper rack posts 5a and lower fulcrum bar 5b folding, right guide rail 2 can downwardly turn over folding.

Above embodiment provide upper rail can folding-jib moveable vertical hoisting mechanism left rail 1 can be fixed at The top in compartment or shelter when loading cargo, is unfolded support rod 5, right guide rail 2 can be supported, so as to lead The length of rail extends to the outside of compartment or shelter, and adjustable shelf 3 is moved to right guide rail 2 at this time, starts speed reducer 4a, can make to receive Roll bar 4b drives telescopic band 4c to extend downward vertically, and the component of the settable suspension hook class in the bottom end of telescopic band 4c is used to connect cargo, Connecting cargo makes to wind bar 4b reversion later, and telescopic band 4c is wound upwards, so as to which object to be lifted upwards, is lifted to object After rising certain altitude, adjustable shelf 3 can be made to be moved to the left left rail 1, so that rolling-up mechanism is put down object at this time can be directly by object Part is put into compartment or shelter suffers, and after cargo loads, can make 5 folding of support rod, upper rack posts 5a can then drive Right guide rail 2 downwardly turns over, so that right guide rail 2 is also taken in compartment or shelter, saves occupied space；When unloading cargo, beat Spending strut 5 rises right guide rail 2, so that adjustable shelf 3 is moved to right guide rail 2 from left rail 1 after rolling-up mechanism connection cargo, then Cargo can easily be unloaded by extending telescopic band 4c downward vertically, whole process is light, convenient, and the labour of operator is strong Degree obtains the reduction of high degree, improves operating efficiency.

Further, adjustable shelf 3 is connected with the driving mechanism for driving it to move on left rail 1 and right guide rail 2, the drive Motivation structure includes the first telescoping cylinder 6a, the telescopic folding bracket 6b connecting with the first telescoping cylinder 6a, a left side of telescopic folding bracket 6b End and the piston rod of the first telescoping cylinder 6a be hinged, right end and adjustable shelf 3 are hinged, and the first telescoping cylinder 6a can drive telescopic folding bracket 6b is unfolded to the right or to left folding, so as to easily make adjustable shelf 3 to the right or be moved to the left.

Preferably, power device includes the motor 4d with the transmission connection of the input shaft of speed reducer 4a, passes through motor 4d Speed reducer output power is given, so that this hoisting mechanism is lighter when lifting cargo, can more reduce worker labour.

In addition, limit control mechanism includes the second telescoping cylinder 7, the bottom end of the second telescoping cylinder 7 and the second fixing piece 7a are hinged, One end of the piston rod of second telescoping cylinder 7 and the left side of lower fulcrum bar 5b are hinged, and the piston rod of the second telescoping cylinder 7 extends Shi Kexiang Right ejection lower fulcrum bar 5b so that upper rack posts 5a and lower fulcrum bar 5b is in unfolded state, and then right guide rail 2 is supported, the The piston rod of two telescoping cylinders 7 can pull lower fulcrum bar 5b when shrinking to the left, so that upper rack posts 5a drives right guide rail 2 to downwardly turn over The form of electric cylinders can be used in folding, above-mentioned first telescoping cylinder 6a and the second telescoping cylinder 7, therefore, in the present embodiment, adjustable shelf 3 movement, the folding of right guide rail 2 and the winding of opening and rolling-up mechanism act can easily be realized by using electric power, Power supply can then be provided by vehicle-mounted mode, convenient and practical.

Embodiment 2

As shown in figs. 4-7, the present embodiment the difference from embodiment 1 is that the power mode of entire mechanism difference (power Device, limit control mechanism are different and are not necessarily to driving mechanism), without consuming electricity, can be completed manually by operator The handling operation of hoisting mechanism.

Specifically, the adjustable shelf 3 in the present embodiment can be pushed directly on worker or appliance ejection by way of make It is moved, and the power device for driving speed reducer 4a to move then can be and shake with what the input shaft of speed reducer 4a was sequentially connected Fixed handle (attached to be not shown in the figure) makes speed reducer output torque by rotation swinging handle, to drive winding bar 4b rotation Come make telescopic band 4c extend or winding, due to speed reducer 4a reduction of speed simultaneously output torque can be improved, load cargo, lift During rising cargo, rotation swinging handle is without expending excessive strength.

Then, as shown in fig. 6, limit control mechanism in the present embodiment includes setting in the bottom upper rack posts 5a and can be along upper The latch 8b length direction of strut 5a movable Elastic buckle 8a and be fixed at the top of lower fulcrum bar 5b, Elastic buckle Compressed spring is connected between 8a and upper rack posts 5a, the upper end of Elastic buckle 8a is protruded outward from upper rack posts 5a, works as upper rack posts When 5a and lower fulcrum bar 5b are in unfolded state, the lower end of Elastic buckle 8a can be caught in latch 8b downwards to limit upper rack posts 5a with Lower fulcrum bar 5b folding, compressed spring is in compressive state at this time, dials up the upper end of Elastic buckle 8a, can make Elastic buckle 8a's Lower end is exited from latch 8b, and compressed spring is further compressed at this time, and folding may be reversed in upper rack posts 5a and lower fulcrum bar 5b.

In the above-described embodiment, preferably, can be arranged in the bottom of Elastic buckle 8a and the top of latch 8b The inclined-plane matched, in this way when upper rack posts 5a is flipped up, the bottom bevel of Elastic buckle 8a can be pressed against the top of latch 8b The sliding of portion inclined-plane, and it is further compressed compressed spring, when the top of the bottom bevel and latch 8b of Elastic buckle 8a is oblique After face disengages, upper rack posts 5a and lower fulcrum bar 5b are in unfolded state, and compressed spring can push Elastic buckle 8a to be caught in hook at this time Buckle 8b, the structure is simple, and upper rack posts 5a and lower fulcrum bar 5b can be made to keep preferable stability after deployment.

In addition, in the present embodiment, also locking member 9 can be arranged in the right end of adjustable shelf 3, and connect in the right end of right guide rail 2 Limit protection column 10 is connect, the bottom end on limit protection column 10 is equipped with limit hole 10a, and the top of locking member 9 is upward through adjustable shelf 3 simultaneously It can be plugged into the limit hole 10a, bottom end is passed down through adjustable shelf 3 and is fixedly connected with pulling block 9a, locking member 9 and adjustable shelf It is connected with the locking spring in compressive state between 3, pulls downward on pulling block 9a, can make the top of locking member 9 from limit hole 10a It exits, and compresses the locking spring further.

Wherein, inclined surface, in this way when adjustable shelf 3 moves right, locking member 9 can be set on the right side on 9 top of locking member Inclined surface can collide limit protection column 10 so that locking member 9 itself moves down and compress locking spring, work as locking When part 9 is aligned with limit hole 10a, under the active force of locking spring, locking member 9 can be caught in upwards in limit hole 10a, to make Adjustable shelf 3 is able to maintain stabilization behind the end for being moved to right guide rail 2.

Above-described embodiment is the preferable implementation of the utility model, and in addition to this, the utility model can be with other sides Formula realizes that any obvious replacement is in the protection model of the utility model under the premise of not departing from the technical program design Within enclosing.

In order to allow those of ordinary skill in the art more easily understand the improvement of the utility model compared with the existing technology it Place, some attached drawings of the utility model and description have been simplified, and for the sake of clarity, present specification is omitted one A little other elements, the element that those of ordinary skill in the art should be aware that these are omitted also may make up the interior of the utility model Hold.

Claims (10)

1. upper rail can folding-jib moveable vertical hoisting mechanism, it is characterised in that: left rail (1) including fixed setting, with it is left The hinged right guide rail (2) of guide rail (1) and the adjustable shelf (3) for being slidably connected to left rail (1), the right guide rail (2) can be downward Overturning keeps flushing to be connected to the two with the left rail (1), and the adjustable shelf (3) can be left rail (1) and right Guide rail (2) holding moves back and forth therebetween when flushing, and the adjustable shelf (3) is equipped with rolling-up mechanism, the rolling-up mechanism Including speed reducer (4a), with speed reducer (4a) transmission connection winding bar (4b) and can by winding bar (4b) wind get up stretch Contracting band (4c), bar (4b) is fixedly connected, the other end can be extended and be used for downward vertically with winding for one end of the telescopic band (4c) Articles, the speed reducer (4a) are sequentially connected with power device, and the bottom of the right guide rail (2) is connected with support rod (5), The support rod (5) includes and the hinged upper rack posts (5a) in right guide rail (2) bottom and the lower fulcrum bar hinged with upper rack posts (5a) (5b), hingedly, the support rod (5), which is equipped with, can keep upper rack posts by the bottom end of the lower fulcrum bar (5b) and the first fixing piece (5c) (5a) and lower fulcrum bar (5b) are in the limit control mechanism of unfolded state, when the upper rack posts (5a) and lower fulcrum bar (5b) are in expansion shape When state, right guide rail (2) support is kept flushing by the support rod (5) to left rail (1), as the upper rack posts (5a) He Xiazhi When bar (5b) folding, the right guide rail (2) can downwardly turn over folding.

2. upper rail according to claim 1 can folding-jib moveable vertical hoisting mechanism, it is characterised in that: the adjustable shelf (3) it is connected with the driving mechanism for driving it to move on left rail (1) and right guide rail (2).

3. upper rail according to claim 2 can folding-jib moveable vertical hoisting mechanism, it is characterised in that: the driving machine The telescopic folding bracket (6b) that structure includes the first telescoping cylinder (6a), connect with the first telescoping cylinder (6a), the telescopic folding bracket The piston rod of the left end of (6b) and the first telescoping cylinder (6a) is hinged, right end and adjustable shelf (3) hingedly, first telescoping cylinder (6a) Telescopic folding bracket (6b) can be driven to be unfolded to the right or to left folding, to make the adjustable shelf (3) to the right or be moved to the left.

4. upper rail according to claim 3 can folding-jib moveable vertical hoisting mechanism, it is characterised in that: the power dress It sets including the motor (4d) with the transmission connection of the input shaft of speed reducer (4a).

5. upper rail according to claim 4 can folding-jib moveable vertical hoisting mechanism, it is characterised in that: the limit control Mechanism processed includes the second telescoping cylinder (7), the bottom end of second telescoping cylinder (7) and the second fixing piece (7a) hingedly, described second One end of the piston rod of telescoping cylinder (7) and the left side of lower fulcrum bar (5b) are hinged, the piston rod elongation of second telescoping cylinder (7) When can lower fulcrum bar (5b) described in ejection to the right so that the upper rack posts (5a) and lower fulcrum bar (5b) are in unfolded state, in turn The right guide rail (2) is supported, the piston rod of second telescoping cylinder (7) can pull lower fulcrum bar (5b) when shrinking to the left, So that the upper rack posts (5a) drive right guide rail (2) to downwardly turn over folding.

6. upper rail according to claim 1 can folding-jib moveable vertical hoisting mechanism, it is characterised in that: the power dress It sets including the swinging handle with the transmission connection of the input shaft of speed reducer (4a).

7. upper rail according to claim 6 can folding-jib moveable vertical hoisting mechanism, it is characterised in that: the limit control Mechanism processed include setting the upper rack posts bottom (5a) and can along upper rack posts (5a) the movable Elastic buckle of length direction (8a) with And it is fixed at the latch (8b) at the top of lower fulcrum bar (5b), it is connected between the Elastic buckle (8a) and upper rack posts (5a) The upper end of compressed spring, the Elastic buckle (8a) is protruded outward from upper rack posts (5a), as the upper rack posts (5a) and lower branch When bar (5b) is in unfolded state, the lower end of the Elastic buckle (8a) can be caught in latch (8b) downwards to limit upper rack posts (5a) and lower fulcrum bar (5b) folding, the compressed spring is in compressive state at this time, dials up the upper of the Elastic buckle (8a) End, can be such that the lower end of the Elastic buckle (8a) exits from latch (8b), and the compressed spring is further compressed at this time, Folding may be reversed in the upper rack posts (5a) and lower fulcrum bar (5b).

8. upper rail according to claim 7 can folding-jib moveable vertical hoisting mechanism, it is characterised in that: the elastic card The bottom for detaining (8a) is equipped with the inclined-plane matched, when the upper rack posts (5a) flip up, institute with the top of latch (8b) The bottom bevel for stating Elastic buckle (8a) can be slided against the top bevel of latch (8b), and make the compressed spring by into one Step compression, after the bottom bevel of the Elastic buckle (8a) is disengaged with the top bevel of latch (8b), the upper branch Bar (5a) and lower fulcrum bar (5b) are in unfolded state, and the compressed spring pushes Elastic buckle (8a) to be caught in latch (8b) at this time.

9. upper rail according to claim 8 can folding-jib moveable vertical hoisting mechanism, it is characterised in that: the adjustable shelf (3) right end is equipped with locking member (9), and the right end of the right guide rail (2) is connected with limit protection column (10), the limit protection column (10) bottom end is equipped with limit hole (10a), and the top of the locking member (9) is upward through adjustable shelf (3) and can be plugged into described In limit hole (10a), bottom end be passed down through adjustable shelf (3) and be fixedly connected with pulling block (9a), the locking member (9) and adjustable shelf (3) it is connected with the locking spring in compressive state between, pulls downward on the pulling block (9a), the top of the locking member (9) can be made End is exited from limit hole (10a), and compresses the locking spring further.

10. upper rail according to claim 9 can folding-jib moveable vertical hoisting mechanism, it is characterised in that: the locking The right side on part (9) top is equipped with inclined surface, and when the adjustable shelf (3) moves right, the inclined surface of the locking member (9) can be touched Limit protection column (10) is bumped against so that locking member (9) itself moves down and compress locking spring, when the locking member (9) When being aligned with limit hole (10a), under the active force of the locking spring, the locking member (9) can be caught in limit hole upwards In (10a).