CN111764618A

CN111764618A - Foldable and movable scaffold

Info

Publication number: CN111764618A
Application number: CN202010754475.5A
Authority: CN
Inventors: 赵康铭; 徐土森; 陶超杰; 楼金源; 杨浩男; 赵辉杰
Original assignee: Zhejiang Wei'an Construction Support Technology Co ltd
Current assignee: Zhejiang Weian Support Technology Co ltd
Priority date: 2020-07-30
Filing date: 2020-07-30
Publication date: 2020-10-13
Anticipated expiration: 2040-07-30
Also published as: CN111764618B

Abstract

The invention discloses a foldable movable scaffold, which comprises a first vertical ladder, a second vertical ladder and a pedal connected between the first vertical ladder and the second vertical ladder, wherein a fence and clamps arranged at two ends of the fence are also arranged between the first vertical ladder and the second vertical ladder; when dismantling the scaffold, after first perpendicular ladder and the folding of second perpendicular ladder, the footboard was placed on first perpendicular ladder and the second perpendicular ladder, and the clip at both ends is connected with the horizontal bar of the first perpendicular ladder of folding and the second perpendicular ladder respectively, and the rail passes through anchor clamps to be connected on the handrail of first perpendicular ladder and the second perpendicular ladder, constitutes the shallow structure.

Description

Foldable and movable scaffold

Technical Field

The invention relates to the field of building assembly production, in particular to a foldable and movable scaffold.

Background

The scaffold is the work platform who sets up in order to guarantee that each work progress goes on smoothly, along with the appearance of the large-scale building system of a large amount of modernizations in china, various scaffolds should be transported, the application volume of scaffold constantly increases, when the construction of building finishes, need dismantle scaffold and move away, lead to scaffold not easy direct transport because of the weight of scaffold, even there is the scaffold that sets up the pulley and also not easy direct promotion is transported away because of its bulky, this kind of scaffold transports very inconveniently, even it also needs the foreign object to borrow the power to transport for a short distance, how to improve the convenience of transportation, in order to solve the inconvenient problem of scaffold transportation, be the key that improves a scaffold and builds and conveying efficiency.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a scaffold capable of being folded and moved, so that the scaffold can be assembled into a simple trolley in the process of disassembling the scaffold, and the scaffold can be conveniently moved.

In order to achieve the purpose, the invention provides the following technical scheme: a foldable movable scaffold comprises a first vertical ladder, a second vertical ladder and a pedal connected between the first vertical ladder and the second vertical ladder, wherein the first vertical ladder and the second vertical ladder are identical in structure, a clasp used for connection is arranged at one end where the pedal is connected with the first vertical ladder, the clasp is buckled on a cross bar of the first vertical ladder, a fence and clamps arranged at two ends of the fence are further arranged between the first vertical ladder and the second vertical ladder, the fence is connected with the first vertical ladder and the second vertical ladder through the clamps, two vertical rods of the first vertical ladder are uniformly divided into a plurality of short vertical rods with the same length, handrails are arranged on the short vertical rods close to the ground, folding assemblies are arranged between every two short vertical rods and used for connecting the two short vertical rods and also used for folding the first vertical rods; when dismantling the scaffold frame first perpendicular ladder and second erect the folding back of ladder, the footboard is placed on first perpendicular ladder and second erect the ladder, and the clip at both ends is connected with the horizontal bar that first perpendicular ladder and second erected the ladder after folding respectively, the rail passes through anchor clamps and connects on the handrail that first perpendicular ladder and second erect the ladder, constitutes the shallow structure.

As a further improvement of the invention, the folding assembly is arranged between the upper short vertical rod and the lower short vertical rod, the folding assembly comprises a fixed seat and two connecting pieces, the two connecting pieces are connected to two opposite sides of the downward end of the upper short vertical rod and are fixedly connected with the short vertical rod, one end of the connecting piece, which is far away from the short vertical rod, is in an arch shape, the fixed seat is fixedly connected with the upward end of the lower short vertical rod, through holes for the passing of the same bolt are formed in the fixed seat and the two connecting pieces, the bolt is matched with the nut for fastening, and a gasket is arranged between the bolt and the connecting piece.

As a further improvement of the invention, the connecting sheet and the horizontal plane form an included angle of 76 degrees, and the gap between the upper short vertical rod and the lower short vertical rod is 4 cm.

As a further improvement of the invention, the connecting sheet is clung to two opposite sides of the downward end of the upper short vertical rod, and when the upper short rod is turned downwards, the connecting sheet is clung to two sides of the lower short vertical rod.

As a further improvement of the invention, the fence comprises short pillars and two long cross bars, wherein a plurality of the short pillars are fixedly connected between the two long cross bars, and two ends of the two long cross bars are connected with the vertical bars of the first vertical ladder and the second vertical ladder through clamps.

As a further improvement of the invention, the connecting pieces at the upper end and the lower end of the same short vertical rod are opposite in direction.

As a further improvement of the invention, the bottoms of the two vertical rods of the first vertical ladder are fixedly connected with an underframe, a reinforcing rib is arranged between the two vertical rods and the underframe, and the reinforcing rib, the vertical rods and the underframe form a triangular support.

As a further improvement of the invention, universal wheels are mounted on the underframe, support frames are arranged at two ends of the underframe, the support frames are adjustably mounted at two sides of the underframe, a plurality of through holes for passing screws are formed in different positions of two sides of the underframe, and the through holes are used for being matched and fixed with the support frames through screws and nuts.

As a further improvement of the invention, the support frame comprises an adjusting sleeve, a support rod and a support seat, wherein one end of the adjusting sleeve is sleeved on the underframe and is assembled with the underframe through a bolt, the other end of the adjusting sleeve is connected with the support rod, and the bottom of the support rod is fixedly connected with the support seat.

As a further improvement of the invention, the support rod comprises a thick rod and a thin rod, the thin rod is fixedly connected with the adjusting sleeve, the thin rod is sleeved in the thick rod, the other end of the thick rod, opposite to the thin rod, is fixedly connected with the support seat, the thin rod is connected with the thick rod through a lifting locking nut, when the lifting locking nut is unscrewed, the lifting height of the thin rod can be adjusted, and when the lifting locking nut is screwed, the thin rod can be fixed so as not to loosen.

The invention has the beneficial effects that: when the scaffold is disassembled, a simple scaffold trolley which is convenient for workers to push can be formed, so that the scaffold is convenient to transport, light and labor-saving; the pedal is arranged between the two folded vertical ladders to form a space for placing articles, for example, articles can be placed when the scaffold is pushed, and the pedal can prevent the folded short vertical rods from turning downwards under the action of gravity, so that the effect of fixing the short vertical rods is achieved, and the scaffold trolley is more stable in the transportation process; the rail can also be used as the rail of the object placing space, and can prevent some objects from falling from the object placing space.

Drawings

FIG. 1 is a front view of the present invention;

FIG. 2 is a side view of the present invention;

FIG. 3 is an enlarged view of a portion of the present invention;

FIG. 4 is an enlarged view of a portion of the present invention;

FIG. 5 is an enlarged view of a portion of the present invention;

FIG. 6 is an enlarged view of a portion of the present invention;

FIG. 7 is an enlarged view of a portion of the present invention;

fig. 8 is a front view of the present invention after folding assembly.

Reference numerals: 1. a pedal; 2. a clasp; 3. a clamp; 4. a folding assembly; 41. a fixed seat; 42. connecting sheets; 5. a gasket; 6. a fence; 61. a short strut; 62. a long cross bar; 7. a chassis; 8. reinforcing ribs; 9. a support frame; 91. an adjusting sleeve; 92. a support bar; 921. a thick rod; 922. a thin rod; 93. a supporting seat; 10. a handrail.

Detailed Description

The invention will be further described in detail with reference to the following examples, which are given in the accompanying drawings.

Referring to fig. 1-8, the foldable scaffold of this embodiment includes a first vertical ladder, a second vertical ladder, and a pedal 1 connected between the first vertical ladder and the second vertical ladder, the first vertical ladder and the second vertical ladder have the same structure, a clasp 2 for connection is provided at one end of the pedal 1 connected with the first vertical ladder, the clasp 2 is fastened on a cross bar of the first vertical ladder, a fence 6 and clamps 3 provided at two ends of the fence 6 are further provided between the first vertical ladder and the second vertical ladder, the fence 6 is connected with the first vertical ladder and the second vertical ladder through the clamps 3, two vertical bars of the first vertical ladder are uniformly divided into a plurality of short vertical bars having the same length, a handrail 10 is provided on the short vertical bar near the ground, a folding assembly 4 is provided between two short vertical bars, the folding assembly 4 is used for connecting the two short vertical bars and also for folding the first vertical bar; when dismantling the scaffold, after first perpendicular ladder and second erected ladder are folding, footboard 1 was placed on first perpendicular ladder and second erected ladder, and the clip 2 at both ends is connected with the whippletree of first perpendicular ladder and second erected ladder after folding respectively, and rail 6 is connected on handrail 10 that first perpendicular ladder and second erected the ladder through anchor clamps 3, constitutes the shallow structure.

Through the technical scheme, the pedal 1 is installed on the first vertical ladder and the second vertical ladder through the clasp 2, a space for trampling is constructed between the first vertical ladder and the second vertical ladder, the fence 6 is further arranged between the first vertical ladder and the second vertical ladder, the fence 6 is connected to the first vertical ladder and the second vertical ladder through the clamp 3, and the scaffold which can be used for a worker to move on the scaffold and can ensure the safety of the worker to a certain extent is formed. Because the first vertical ladder and the second vertical ladder have the same structure, the first vertical ladder is only explained here, and the second vertical ladder is not repeated. First vertical ladder includes two montants and connects a plurality of whippletrees of two montants, and two montants evenly divide into the same short montant of a plurality of segment lengths, is provided with between two upper and lower short montants and connects folding assembly 4 between them, and folding assembly 4 can make short montant rotate to reach folding purpose.

When the scaffold frame is dismantled to the construction completion, dismantle rail 6 earlier, erect the ladder with first in proper order, two montants of ladder are rolled over and turn over down to place footboard 1 between two horizontal bars that erect the ladder, if have a plurality of footboards 1 time, put footboard 1 in proper order between the horizontal pole on two perpendicular terraces on every layer, install rail 6 again between two perpendicular terraces after folding, the both ends of rail 6 are passed through anchor clamps 3 and are connected on the handrail 10 of the perpendicular ladder after folding, form a simple and easy scaffold frame dolly that makes things convenient for staff to promote from this. The fence 6 can be directly connected to the handrail 10 through the clamp 3, so that the situation that two adjacent short vertical rods cannot be attached due to the fact that the fence 6 is connected to the short vertical rods is avoided, and the handrail 10 can be used by workers when pushing a scaffold trolley, so that labor is saved and convenience is achieved; the pedal 1 is arranged between the two folded vertical ladders to form a space for placing articles, for example, articles can be placed when the scaffold is pushed, and the pedal 1 can prevent the folded short vertical rods from turning downwards under the action of gravity, so that the effect of fixing the short vertical rods is achieved, and the scaffold trolley is more stable in the transportation process; the fixed of rail 6 to two folding back perpendicular ladders makes two perpendicular ladders between form a more firm connected relation, when the staff promotes the scaffold, it can remove more steadily, and rail 6 also can be as the rail 6 of putting the thing space, can block that some articles from putting the thing space and drop, through this folding assembly method, when the installation is perpendicular the ladder, utilize rail 6 to come to fix two perpendicular ladders that expand, can avoid perpendicular ladder to turn over under the action of gravity, there is the effect of quick installation, and cooperation footboard 1 can play the effect that improves the security.

As a modified embodiment, folding assembly 4 sets up between two upper and lower short montants, folding assembly 4 includes fixing base 41 and two connection pieces 42, two connection pieces 42 are connected the relative both sides of short montant one end down in the top, and with this short montant fixed connection, the one end that this short montant was kept away from to connection piece 42 is the arch, fixing base 41 and the short montant one end fixed connection up of below, all be provided with the through-hole that is used for same bolt to pass through on fixing base 41 and two connection pieces 42, the bolt fastens with the nut cooperation, still be provided with packing ring 5 between bolt and the connection piece 42.

Through the technical scheme, folding assembly 4 sets up between per two upper and lower short montants, the book of turning over of two upper and lower short montants is realized through folding assembly 4, fixing base 41 in folding assembly 4 and the short montant of below one side fixed connection up, be provided with the through-hole on fixing base 41, be used for the bolt to pass through, connect with connection piece 42 cooperation, two connection pieces 42 of fixing base 41 complex fixed connection respectively in the short montant of above both sides relative towards lower one end, the one end that connection piece 42 is close to the short montant of below is the arch, the through-hole that sets up in arch one end cooperates with the through-hole on fixing base 41, be used for same root bolt to pass through, bolt and nut cooperation, make folding assembly 4 firmly with two upper and lower short montants connected. In the technical scheme, the bolt is matched and fastened with the two nuts, the possibility of bolt loosening is further reduced by the two nuts relative to one nut, the folding assembly 4 cannot loosen, the overall stability of the scaffold is improved, and the hidden danger of safety accidents is reduced; the arched arrangement of one end of the connecting sheet 42 enables the connecting sheet 42 not to scratch other parts when rotating around the point connected with the bolt, and potential safety hazards caused by acute angles of workers can be avoided in the installation and disassembly processes, a gasket 5 is further arranged between the bolt and the connecting sheet 42, the gasket 5 increases the contact area, the pressure between the bolt and the connecting sheet 42 is reduced, the shock absorption effect is achieved, and the possibility of looseness between the bolt and the nut is reduced through the shock absorption of the absorption part.

As a modified embodiment, the connecting piece 42 forms an angle of 76 degrees with the horizontal plane, and the gap between the upper short vertical rod and the lower short vertical rod is 4 cm.

Through the technical scheme, the 76-degree included angle in the technical scheme enables the short vertical rods above to be turned down and then to be attached to the short vertical rods below, the 76-degree included angle is matched with the 4cm gap between the two short vertical rods to provide the maximum supporting force between the upper short vertical rods and the lower short vertical rods, and the turning of the short vertical rods can have enough moving space, so that the scaffold can provide a powerful supporting effect in normal use, the short vertical rods can be tightly attached to each other when the scaffold is folded and reassembled to form a scaffold trolley, the space after the short vertical rods are folded is reduced, the scaffold is pushed by a worker to be lighter, the positions of the transverse rods after the two vertical ladders are folded can be kept corresponding under the action of tight attachment between the short vertical rods, the pedal 1 can be conveniently installed to carry out trolley structure components, and the condition that the positions of the transverse rods are uneven is avoided, making the pedal 1 difficult to install.

In a further preferred embodiment, the center of the node connecting the connecting piece 42 and the fixing seat 41 is located in the length direction of the side of the short vertical rod, as shown in the attached drawings. The fitting effect of two short vertical rods after being turned can be further improved, and the position of the node is located at the center of the gap between the two short vertical rods, namely the position 2cm away from the upper short vertical rod in the embodiment.

As a modified specific embodiment, the connecting piece 42 is attached to two opposite sides of the upper short vertical rod towards the lower end, and when the upper short rod is turned downwards, the connecting piece 42 is attached to two sides of the lower short vertical rod.

Through above-mentioned technical scheme, hug closely the connection piece 42 of the relative both sides of the short montant of top down end around rotating with bolted connection's place, turn over down 180 and hug closely the short montant of below when the short montant of top down turns over, connection piece 42 still laminates the both sides of the short montant of below simultaneously, play fixed short montant and spacing effect, when folding back scaffold frame removed, connection piece 42 can reduce rocking of short montant, increase the holistic stability of scaffold frame.

As a modified specific embodiment, the fence 6 includes a short pillar 61 and two long cross bars 62, the short pillars 61 are fixedly connected between the two long cross bars 62, and both ends of the two long cross bars 62 are connected with the vertical bars of the first vertical ladder and the second vertical ladder through the clamp 3.

Through above-mentioned technical scheme, rail 6 sets up in the first homonymy that erects the ladder and the second erects the ladder, and two both sides that erect the ladder all have and set up rail 6, form a space that surrounds, for the staff provides a safer operational environment, and be provided with a plurality of short strut 61 in the rail 6, and the position of short strut 61 sets up to triangle-shaped, and a plurality of triangle-shaped's shape has increased rail 6's intensity, has also strengthened the holistic stability of scaffold frame.

Anchor clamps 3 adopt current cross fastener, can adapt to the different angles between two steel pipes and connect two steel pipes.

As a modified embodiment, the connecting pieces 42 at the upper end and the lower end of the same short vertical rod are oppositely oriented.

Through the technical scheme, the connecting pieces 42 at the upper end and the lower end of the same short vertical rod are opposite in orientation, namely the short vertical rod is different from the turning direction of the short vertical rod above the short vertical rod, if the short vertical rod above the short vertical rod is turned towards the left, the short vertical rod below the short vertical rod is turned towards the right, and the adjacent short vertical rods can be mutually attached through the folding mode.

As a modified specific embodiment, the bottom of the two vertical rods of the first vertical ladder is fixedly connected with the bottom frame 7, the reinforcing ribs 8 are further arranged between the two vertical rods and the bottom frame 7, and the reinforcing ribs 8, the vertical rods and the bottom frame 7 form a triangular support.

Through above-mentioned technical scheme, the first bottom of erecting the ladder and erecting the ladder with the second all is provided with chassis 7, is provided with strengthening rib 8 between chassis 7 and the montant of erecting the ladder, and forms the triangular supports, and the triangular supports structure is the comparatively big structure of intensity, and at the in-process that the scaffold used, the triangular supports had shared pressure for two montants of erecting the ladder, made the connection between montant and the chassis 7 more stable.

As a modified specific implementation mode, install the universal wheel on chassis 7, the both ends of chassis 7 all are provided with support frame 9, and support frame 9 is for installing in the both sides of chassis 7 adjustably, and the different positions of the both sides of chassis 7 are provided with a plurality of through-holes that are used for the screw rod to pass through, and the through-hole is used for passing through screw rod, nut cooperation fixed with support frame 9.

Through the technical scheme, the universal wheels are arranged on the underframe 7, when the scaffold is folded and installed, workers can push and transport the scaffold as a trolley, the universal wheels save labor for the workers, and the burden of the workers is reduced; because of the both sides of chassis 7 are provided with the through-hole of different positions, but support frame 9 optional different through-holes assemble the installation in order to reach the purpose of adjusting chassis 7 and the whole length of support frame 9, can adapt to the situation and the different production demands in different building sites.

As a modified specific embodiment, the supporting frame 9 includes an adjusting sleeve 91, a supporting rod 92 and a supporting seat 93, one end of the adjusting sleeve 91 is sleeved on the bottom frame 7 and assembled with the bottom frame 7 through a bolt, the other end of the adjusting sleeve 91 is connected with the supporting rod 92, and the bottom of the supporting rod 92 is fixedly connected with the supporting seat 93.

Through above-mentioned technical scheme, adjusting collar 91, bracing piece 92 and supporting seat 93 form support frame 9, set up in chassis 7 both sides, for the scaffold frame provides additional supporting role, supporting seat 93 has increased with the area of contact on ground, has increased the holistic stability of scaffold frame.

As a specific embodiment of the improvement, the supporting rod 92 comprises a thick rod 921 and a thin rod 922, the thin rod 922 is fixedly connected with the adjusting sleeve 91, the thin rod 922 is sleeved in the thick rod 921, the thick rod 921 is fixedly connected with the supporting seat 93 opposite to the other end of the thin rod 922, the thin rod 922 is connected with the thick rod 921 through a lifting locking nut, when the lifting locking nut is loosened, the height of the thin rod 922 can be adjusted, and when the lifting locking nut is tightened, the thin rod 922 can be fixed so as not to loosen any more.

Through above-mentioned technical scheme, because of ground is not level and smooth completely, always there is the uneven condition of height, bracing piece 92 sets up to adjustable length, adapts to different ground conditions, reduces the left and right sides rocking and the unstable condition of scaffold frame, makes the staff have a comparatively safe environment when the activity on the scaffold frame.

The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.

Claims

1. The foldable movable scaffold is characterized by comprising a first vertical ladder, a second vertical ladder and a pedal (1) connected between the first vertical ladder and the second vertical ladder, wherein the first vertical ladder and the second vertical ladder are identical in structure, a clasp (2) for connection is arranged at one end of the pedal (1) connected with the first vertical ladder, the clasp (2) is fastened on a cross bar of the first vertical ladder, a fence (6) and clamps (3) arranged at two ends of the fence (6) are further arranged between the first vertical ladder and the second vertical ladder, the fence (6) is connected with the first vertical ladder and the second vertical ladder through the clamps (3), two vertical rods of the first vertical ladder are uniformly divided into a plurality of short vertical rods with the same length, a handrail (10) is arranged on the short vertical rods close to the ground, folding assemblies (4) are arranged between every two short vertical rods, and the folding assemblies (4) are used for connecting the two short vertical rods, also for folding the first vertical bar; when dismantling the scaffold frame first perpendicular ladder and second erect the ladder folding back, place on first perpendicular ladder and second are erected the ladder footboard (1), and clasp (2) at both ends are connected with the horizontal bar that first perpendicular ladder and second erected the ladder after folding respectively, rail (6) are connected on handrail (10) that first perpendicular ladder and second erected the ladder through anchor clamps (3), constitute the shallow structure.

2. The foldable movable scaffold according to claim 1, wherein the folding assembly (4) is arranged between an upper short vertical rod and a lower short vertical rod, the folding assembly (4) comprises a fixed seat (41) and two connecting pieces (42), the two connecting pieces (42) are connected to two opposite sides of the lower end of the upper short vertical rod and fixedly connected with the short vertical rod, one end of the connecting piece (42) far away from the short vertical rod is arched, the fixed seat (41) is fixedly connected with the upper end of the lower short vertical rod, through holes for passing the same bolt are formed in the fixed seat (41) and the two connecting pieces (42), the bolt is fastened with the nut in a matching manner, and a gasket (5) is arranged between the bolt and the connecting piece (42).

3. A collapsible mobile scaffolding according to claim 2, wherein the connection pieces (42) form an angle of 76 ° with the horizontal plane, the gap between the upper and lower short vertical rods being 4 cm.

4. A collapsible working scaffolding as claimed in claim 3 wherein the attachment tabs (42) are adapted to engage opposite sides of the upper short vertical member facing downwardly and the tabs (42) engage opposite sides of the lower short vertical member when the upper short vertical member is folded downwardly.

5. A collapsible mobile scaffolding according to claim 1, characterized in that the fence (6) comprises short posts (61) and two long crossbars (62), a number of said short posts (61) being fixedly connected between the two long crossbars (62), both ends of the two long crossbars (62) being connected by clamps (3) and the vertical bars of the first and second ladders.

6. A collapsible mobile scaffolding according to claim 4 wherein the connecting pieces (42) at the upper and lower ends of the same short vertical rod are oppositely orientated.

7. A foldable and movable scaffold according to claim 6, characterized in that the bottom of the two vertical rods of the first vertical ladder is fixedly connected with a bottom frame (7), a reinforcing rib (8) is arranged between the two vertical rods and the bottom frame (7), and the reinforcing rib (8), the vertical rods and the bottom frame (7) form a triangular support.

8. The foldable and movable scaffold according to claim 7, wherein universal wheels are installed on the bottom frame (7), support frames (9) are arranged at two ends of the bottom frame (7), the support frames (9) are adjustably installed on two sides of the bottom frame (7), a plurality of through holes for passing screws are formed in different positions of two sides of the bottom frame (7), and the through holes are used for being matched and fixed with the support frames (9) through screws and nuts.

9. The scaffold capable of being folded and moved according to claim 8, wherein the supporting frame (9) comprises an adjusting sleeve (91), a supporting rod (92) and a supporting seat (93), one end of the adjusting sleeve (91) is sleeved on the bottom frame (7) and assembled with the bottom frame (7) through a bolt, the other end of the adjusting sleeve (91) is connected with the supporting rod (92), and the bottom of the supporting rod (92) is fixedly connected with the supporting seat (93).

10. A scaffold capable of being folded and moved according to claim 9, wherein the supporting rods (92) comprise thick rods (921) and thin rods (922), the thin rods (922) are fixedly connected with the adjusting sleeves (91), the thin rods (922) are sleeved in the thick rods (921), the thick rods (921) are fixedly connected with the other ends of the thin rods (922) and the supporting seats (93), the thin rods (922) and the thick rods (921) are connected through lifting locking nuts, the lifting height of the thin rods (922) can be adjusted when the lifting locking nuts are loosened, and the thin rods (922) can be fixed to prevent loosening when the lifting locking nuts are tightened.