Convenient transfer trolley for building bidding document files
By designing a convenient transfer truck, the problem of time-consuming and labor-intensive handling of bid documents by manpower is solved, and efficient and convenient transfer of bid documents is achieved.
Patent Information
- Application Number
- CN202421726754.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-22
- Publication Date
- 2025-04-18
- Estimated Expiration
- 2034-07-22
AI Technical Summary
In the prior art, it is time-consuming and labor-intensive to carry construction bid documents by manpower, and it is difficult to carry a large number of bid documents efficiently.
A convenient transfer trolley for building bid documents including fixed carriages, folding carriages and drive components is designed. The fixed car is composed of a first cabin body and a second cabin body arranged in aligned manner. The folding car is folded and unfolded by a folding frame and a folding cloth. The driving component can drive the car body movement and reduce transportation difficulty.
The car still has a certain carrying capacity in the folding state. The design of the folding car improves portability and loading capacity. The driving components simplify the transportation process of large-scale bid documents, saving time and effort.
Smart Images

Figure CN222769436U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of mechanical trolleys, and in particular to a convenient transport trolley for construction bidding documents. Background Art
[0002] A construction bid is a bidding document submitted by the bidder in accordance with the requirements mentioned in the bidding document. The document should be delivered to the bidding location. After receiving the bid, the tenderer should sign for it and keep it. When the bid is opened, it should be allowed to be opened and read out in public.
[0003] At the bidding site, each company participating in the bidding only has its own bidding documents. When there are many companies participating in the bidding, the number of bidding documents is huge, and it is time-consuming and labor-intensive to transfer these documents by manpower. Sometimes the bidding documents are not only huge in number but also thick in thickness, which is even more time-consuming and labor-intensive to move by manpower, and it is inconvenient to carry them on ordinary transport vehicles. Summary of the invention
[0004] Based on this, the problem in the prior art that it is time-consuming and labor-intensive to carry tender documents manually and that it is inconvenient to carry them on a general transport vehicle is addressed.
[0005] It is necessary to provide a convenient transport trolley for construction bidding documents that can solve the above-mentioned problems in the prior art.
[0006] A convenient transport trolley for construction bidding documents comprises a fixed carriage, a folding carriage and a driving assembly, wherein the fixed carriage comprises a first carriage and a second carriage, and the first carriage and the second carriage are arranged in opposition; the folding carriage is arranged between the first carriage and the second carriage, and the folding carriage comprises a folding frame and a folding cloth, and openings are arranged on adjacent two sides of the folding cloth, the folding cloth is detachably connected to the folding frame, and the folding cloth is arranged on the folding frame; the driving assembly is slidably installed on a side of the first carriage and the second carriage away from the opening, and can be retracted into the first carriage and the second carriage.
[0007] Preferably, the fixed carriage further includes a plurality of handles, and the handles are fixedly connected to one side of the first carriage body and the second carriage body.
[0008] Preferably, the folding frame includes a first mounting member and a second mounting member, the first mounting member is detachably mounted on a side of the first body away from the handle, the second mounting member is detachably mounted on a side of the second body away from the handle, one end of the folding cloth is connected to the first mounting member, and the other end of the folding cloth is connected to the second mounting member.
[0009] Preferably, the folding frame further includes a plurality of first retracting members, a plurality of second retracting members and a plurality of adapter members, the first retracting members can be rotatably mounted on the first mounting member, the second retracting members can be rotatably mounted on the second mounting member, and both the first retracting members and the second retracting members can be rotatably mounted on the adapter member.
[0010] Preferably, a first rotating member and a second rotating member are hinged on the adapter.
[0011] Preferably, the folding cloth is provided with a mounting hole near the opening, and the first rotating member and the second rotating member are installed through the mounting hole.
[0012] Preferably, the first rotating member and the second rotating member can rotate around the intersection between a first position and a second position, the first position is a vertical plane, and the second position is a horizontal plane.
[0013] Preferably, the driving assembly comprises a slide plate, and the slide plate is slidably mounted on a side of the first body and the second body away from the opening.
[0014] Preferably, the driving assembly further includes a plurality of steering shafts and a plurality of rollers, wherein the steering shafts are rotatably mounted on the skateboard, and the rollers are rotatably mounted on the steering shafts.
[0015] Preferably, the portable transport trolley for construction bidding documents further comprises a spacer, which is detachably mounted in the folding carriage and is used to separate different bidding documents.
[0016] The technical solution adopted in this application can achieve the following beneficial effects:
[0017] The embodiment of the present application discloses a portable transport vehicle for construction bidding documents. The first and second compartments of the fixed compartment have a certain space, which can ensure that the vehicle has a certain carrying capacity in the folded state. The folding compartment can be folded, and has a large loading capacity after being unfolded, and can carry a large number of bidding documents at one time; the folding cloth is detachably connected to the folding frame, and the folding cloth is arranged on the folding frame. The folding cloth can be folded up with the folding frame. When in use, the folding frame is unfolded to unfold the folding compartment. After the folding frame is unfolded, it can also provide support for the folding cloth to increase the carrying capacity of the folding cloth; the design of the folding compartment can improve the portability of the vehicle, and facilitate the storage and operation of the vehicle when the vehicle is not in use. The adjacent two sides of the folding cloth are provided with openings, the openings arranged upwards can facilitate the folding of the folding cloth, and the openings arranged forwards are convenient for loading and unloading bidding documents. The driving component can drive the fixed compartment and the folding compartment to move, reduce the difficulty of movement, and realize the transportation of large quantities of bidding documents in a time-saving and labor-saving manner. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 This is an axonometric diagram of an embodiment of a portable transport vehicle for construction bidding documents in an unfolded state;
[0019] Figure 2 This is a bottom-up schematic diagram of a portable transport vehicle for construction bidding documents in an unfolded state according to an embodiment;
[0020] Figure 3 This is a partial schematic diagram of a construction bidding document portable transport vehicle in an unfolded state according to an embodiment;
[0021] Figure 4 It is a partial cross-sectional schematic diagram of a construction bidding document portable transport vehicle in an unfolded state according to an embodiment;
[0022] In the figure: fixed carriage 1, first carriage 2, second carriage 3, folding carriage 4, folding cloth 5, folding frame 6, first mounting member 7, second mounting member 8, first retracting member 9, second retracting member 10, adapter 11, first rotating member 12, second rotating member 13, handle 14, mounting hole 15, steering shaft 16, roller 17, slide plate 18, pin 19, partition 20, slide groove 21, shaft 22, shaft hole 23, drive assembly 24. DETAILED DESCRIPTION
[0023] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present application are given in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thoroughly and comprehensively understood.
[0024] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right", "top", "bottom", "bottom end", "top end" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.
[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.
[0026] Please see Figures 1 to 4 In one embodiment, a portable transport vehicle for construction bidding documents includes a fixed carriage 1, a folding carriage 4 and a driving assembly 24, wherein the fixed carriage 1 includes a first carriage 2 and a second carriage 3, wherein the first carriage 2 and the second carriage 3 are arranged in opposition; the folding carriage 4 includes a folding frame 6 and a folding cloth 5, wherein openings are arranged on adjacent two sides of the folding cloth 5, the folding cloth 5 is detachably connected to the folding frame 6, and the folding cloth 5 is arranged on the folding frame 6, wherein one end of the folding frame 6 is connected to the first carriage 2, and the other end of the folding frame 6 is connected to the second carriage 3; the driving assembly 24 is slidably installed on the side of the first carriage 2 and the second carriage 3 away from the opening, and can be retracted into the first carriage 2 and the second carriage 3.
[0027] Specifically, the fixed carriage 1 includes a first carriage 2 and a second carriage 3 that are arranged in opposition, and the folding carriage 4 is arranged between the first carriage 2 and the second carriage 3. The first carriage 2 and the second carriage 3 that are arranged in opposition can provide certain support for the convenient transport trolley for construction bidding documents. The folding carriage 4 can be folded to reduce the space occupied by the trolley for easy carrying. The folding carriage 4 includes a folding frame 6 and a folding cloth 5. The folding cloth 5 is set to an incompletely closed structure, and the upward and forward sides are set to an open state, which is convenient for placing or taking bidding documents; the folding cloth 5 is detachably installed on the folding frame 6, and is unfolded as the folding frame 6 is unfolded, and is folded as the folding frame 6 is folded. The detachable connection can also facilitate the replacement and cleaning of the folding cloth 5. The folding frame 6 can provide sufficient support for the folding cloth 5, ensuring that the folding carriage 4 has a certain carrying capacity, that is, ensuring that the folding carriage 4 can transport a large number of bidding documents. The first compartment 2 and the second compartment 3 are provided with two upper and lower openings, and a partition 20 is provided in the middle and lower part of the compartment. The upper side of the partition 20 can be used to hold tender documents, and a slide groove 21 is provided on the side wall of the compartment under the partition 20 for installing a drive assembly 24. The drive assembly 24 can slide up and down along the slide groove 21, and can be put into the compartment after use. The drive assembly 24 can be set to be electrically driven, which can make the transportation of tender documents easier.
[0028] The above-mentioned convenient transport trolley for construction bidding documents can achieve the following technical effects: the first compartment 2 and the second compartment 3 of the fixed compartment 1 have a certain space, which can ensure that the trolley has a certain carrying capacity in the folded state. The folding compartment 4 can be folded, and has a large loading capacity after unfolding, and can carry a large number of bidding documents at one time; the folding cloth 5 is detachably connected to the folding frame 6, and the folding cloth 5 is arranged on the folding frame 6. The folding cloth 5 can be folded up with the folding frame 6. When in use, the folding frame 6 is unfolded to unfold the folding compartment 4. After the folding frame 6 is unfolded, it can also provide support for the folding cloth 5 to increase the carrying capacity of the folding cloth 5; the design of the folding compartment 4 can improve the portability of the trolley, and facilitate the storage and operation of the trolley when the trolley is not in use. The adjacent two sides of the folding cloth 5 are provided with openings. The opening arranged upward can facilitate the folding of the folding cloth 5, and the opening arranged forward is convenient for loading and unloading bidding documents. The driving assembly 24 can drive the fixed carriage 1 and the folding carriage 4 to move, thereby reducing the difficulty of movement and realizing the transportation of large quantities of tender documents in a time-saving and labor-saving manner.
[0029] In addition, this application also provides some more specific implementation methods to improve the above structure.
[0030] Furthermore, in order to facilitate carrying the trolley when not in use, the fixed carriage 1 also includes a plurality of handles 14 , and the handles 14 are fixedly connected to one side of the first carriage 2 and the second carriage 3 .
[0031] Specifically, the handle 14 is arranged on the side of the first compartment 2 and the second compartment 3, so that the trolley can be easily carried after being folded. When a large number of tender documents do not need to be carried, the trolley is in a folded state, and the space of the first compartment 2 and the second compartment 3 is sufficient to hold the tender documents. The load of the trolley is not very large, and the weight of the trolley itself is not large. At this time, it is no longer necessary to drive with the help of the driving assembly 24, and the trolley can be easily transported and carried by the handle 14.
[0032] Furthermore, in order to facilitate the folding of the cart, the folding frame 6 includes a first mounting member 7 and a second mounting member 8. The first mounting member 7 can be detachably mounted on a side of the first body 2 away from the mounting handle 14, and the second mounting member 8 can be detachably mounted on a side of the second body 3 away from the mounting handle 14. The folding frame 6 also includes a first retracting member 9, a second retracting member 10 and a adapter 11. The first retracting member 9 can be rotatably mounted on the first mounting member 7, and the second retracting member 10 can be rotatably mounted on the second mounting member 8. One end of the folding cloth 5 is connected to the first mounting member 7, and the other end of the folding cloth 5 is connected to the second mounting member 8.
[0033] Specifically, an axial hole 23 is provided on the side of the first body 2 and the second body 3 away from the mounting handle 14, and an axis 22 is provided on the side of the first mounting member 7 and the second mounting member 8. The axis 22 is installed in the axial hole 23 so that the first mounting member 7 and the second mounting member 8 can be removed and installed from the first body 2 and the second body 3, and the first mounting member 7 and the second mounting member 8 cannot rotate; other axial holes are provided at the bottom of the first mounting member 7 and the second mounting member 8, and a rotating shaft is provided at one end of the first contraction member 9, and the rotating shaft can be rotatably mounted on the first mounting member 7, and a rotating shaft is also provided at one end of the second contraction member 10 The rotating shaft can be rotatably installed on the second installation member 10; the first contraction member 9 and the second contraction member 10 are respectively provided with a hinge shaft at the other end, and the lower end of the adapter 11 is provided with hinge holes on the left and right sides. The first contraction member 9 and the second contraction member 10 are respectively hinged at the left and right ends of the adapter 11 through the hinge shaft, and can rotate around the hinge part. The folding of the folding frame 6 is achieved through the relative movement among the first contraction member 9, the second contraction member 10 and the adapter 11. The adapter 11 can ensure that the rotation of the first contraction member 9 and the second contraction member 10 will not interfere with each other, thereby ensuring that the folding frame 6 can be used normally.
[0034] Furthermore, in order to ensure that the trolley has a certain degree of sealing when in the folded state, a first rotating member 12 and a second rotating member 13 are hinged on the adapter 11. The first rotating member 12 and the second rotating member 13 can rotate around the intersection between a first position and a second position. The first position is a vertical plane, and the second position is a horizontal plane.
[0035] Specifically, the adapter 11 is hinged with a first rotating member 12 and a second rotating member 13, which are arranged in parallel and can rotate around the hinge part. When the trolley is in a folded state, the first rotating member 12 and the second rotating member 13 can rotate around the hinge part from a vertical position to a horizontal position. In the vertical position, the first rotating member 12 and the second rotating member 13 are arranged in parallel and can act as a baffle between the trolleys. When rotated to the horizontal position, the first rotating member 12 and the second rotating member 13 are arranged in parallel and can act as a baffle between the trolleys and can be buckled on the first body 2 and the second body 3 as closing covers of the first body 2 and the second body 3. The rotation directions of the first rotating member 12 and the second rotating member 13 are opposite.
[0036] Furthermore, to ensure that the first rotating member 12 and the second rotating member 13 do not rotate spontaneously when in the vertical position, the folding cloth 5 is provided with a mounting hole 15 near the opening, and the first rotating member 12 and the second rotating member 13 are installed through the mounting hole 15 .
[0037] Specifically, a mounting hole 15 is provided on one side of the folding cloth 5 close to the first rotating member 12 and the second rotating member 13, and the first rotating member 12 and the second rotating member 13 are fixed in the vertical direction through the mounting hole 15. When the folding frame 6 is fully unfolded, the folding cloth 5 is in a tensioned state and has a large bearing capacity, so the mounting hole 15 provided can provide a certain support to the first rotating member 12 and the second rotating member 13, so that they will not rotate spontaneously in the vertical direction. When the folding frame 6 is folded, as the first contraction member 9 and the second contraction member 10 contract, the adapter 11 will move upward, the folding cloth 5 is no longer pulled, and the mounting hole 15 no longer supports the first rotating member 12 and the second rotating member 13, and the first rotating member 12 and the second rotating member 13 begin to rotate spontaneously from a vertical position to a horizontal position, and fall on the first compartment 2 and the second compartment 3, forming a relatively closed structure.
[0038] Furthermore, in order to improve the convenience of the vehicle, the driving assembly 24 includes a slide plate 18, and the slide plate 18 is slidably mounted on a side of the first body 2 and the second body 3 away from the opening.
[0039] Specifically, the first body 12 and the second body 13 are provided with two upper and lower openings, and a partition 20 is provided in the middle and lower part of the body. The partition 20 divides the first body 2 and the second body 3 into two upper and lower parts. A slide groove 21 is provided on the side wall of the body below the partition 20. The slide plate 18 is slidably installed in the slide groove 21 and can slide along the slide groove 21. Two pin holes are provided on one side of the body, and a pin hole is also provided on the slide plate 18. The slide plate 18 is fixed by the cooperation of the pin 19 and the pin hole to prevent it from sliding, thereby ensuring that it will not be retracted into the first body 2 and the second body 3 during use, and will not extend to the outside of the first body 2 and the second body 3 when the trolley is in the folded state.
[0040] Furthermore, the driving assembly 24 further includes a plurality of steering shafts 16 and a plurality of rollers 17, wherein the steering shaft 16 is rotatably mounted on the skateboard 18, and the rollers 17 are rotatably mounted on the steering shaft 16. Specifically, a plurality of steering shafts 16 are mounted on the skateboard 18, the steering shafts 16 can change the movement direction of the trolley, the steering shafts 16 can rotate in all directions, and the rollers 17 are mounted on the steering shafts.
[0041] Furthermore, in order to facilitate the subsequent review of tender documents of different companies, the portable transport trolley for construction tender documents also includes a spacer, which is detachably installed in the folding carriage 4 and is used to separate different tender documents.
[0042] Specifically, at the bidding site, there will be many companies participating in the bidding, and the bidding documents of each company are different. After all the bidding documents are collected together, all the company's bidding documents will be mixed together and difficult to consult. In order to facilitate the subsequent review of bidding documents of different companies, the construction bidding document convenient transfer cart also includes a spacer, and the spacer is provided with the company name. The spacer is used to separate the bidding documents of different companies. When consulting, you only need to use the spacer to quickly find the bidding documents of the target company.
[0043] Furthermore, when transporting a large number of tender documents, the first contraction member 9 and the second contraction member 10 are rotated to a horizontal position by separating the first compartment 2 and the second compartment 3, so that the folding frame 6 is fully unfolded, the first contraction member 9 and the second contraction member 10 are fully unfolded, and the folding cloth 5 is fully unfolded. The first rotating member 12 and the second rotating member 13 are located on the vertical plane through the mounting hole 15 set on the folding cloth 5, which can play a role of blocking, and the tender documents are neatly placed in the folding compartment 4, and the tender documents of different companies are separated by the spacer; at the same time, the slide plate 18 slides along the slide groove 21 to the bottom of the first compartment 2 or the second compartment 3, and the slide plate 18 is fixed to the bottom of the first compartment 2 or the second compartment 3 by the cooperation of the pin 19 and the pin hole, and the movement direction of the trolley is controlled by the steering shaft 16, and the transportation resistance is reduced by the roller 17. When transporting a very small number of tender documents or no tender documents, it is not necessary to unfold the folding compartment 4, and the tender documents are directly placed in the first compartment 2 and the second compartment 3 for transportation. After using the trolley, fold it. During the folding process, the adapter 11 moves upward, pulling the first contraction member 9 and the second contraction member 10 to rotate upward for contraction. During the upward movement of the adapter 11, the first rotating member 12 and the second rotating member 13 begin to gradually break away from the restriction of the mounting hole 15 and begin to spontaneously rotate from a vertical position to a horizontal position, covering the first body 2 and the second body 3 to form a relatively sealed space. If the roller 17 is not needed to drive, the slide plate 18 is retracted into the first body 2 and the second body 3, fixed in the first body 2 and the second body 3 by the pin 19, and carried by the handle 14.
[0044] Through the above implementation, the portable transport vehicle for construction bidding documents in the embodiment can achieve at least the following technical effects:
[0045] The first compartment 2 and the second compartment 3 of the fixed compartment 1 have a certain space, which can ensure that the trolley has a certain carrying capacity in the folded state. The folding compartment 4 can be folded, and has a large loading capacity after unfolding, and can carry a large number of tender documents at one time; the folding cloth 5 is detachably connected to the folding frame 6, and the folding cloth 5 is arranged on the folding frame 6. The folding cloth 5 can be folded up with the folding frame 6. When in use, the folding frame 6 is unfolded to unfold the folding compartment 4. After the folding frame 6 is unfolded, it can also provide support for the folding cloth 5 to increase the carrying capacity of the folding cloth 5; the design of the folding compartment 4 can improve the portability of the trolley, and facilitate the storage and operation of the trolley when the trolley is not in use. The adjacent two sides of the folding cloth 5 are provided with openings, the openings arranged upwards can facilitate the folding of the folding cloth 5, and the openings arranged forwards are convenient for loading and unloading tender documents. The driving component 24 can drive the fixed compartment 1 and the folding compartment 4 to move, reduce the difficulty of movement, and save time and effort to realize the transportation of large quantities of tender documents. Since the folding cloth 5 is a soft material, it can be easily folded when the trolley is folded, and it does not need to be disassembled. The setting of the steering shaft 16 can realize the steering of the trolley, can improve the flexibility of the trolley, and realize efficient handling.
[0046] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0047] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.
Claims
1. A portable transport vehicle for construction bidding documents, characterized in that: include: A fixed carriage, the fixed carriage comprising a first carriage body and a second carriage body, the first carriage body and the second carriage body being arranged in an opposite position; A folding carriage, the folding carriage comprising a folding frame and a folding cloth, the folding cloth having openings on adjacent two sides, the folding cloth being detachably connected to the folding frame, and the folding cloth being connected to the folding frame, one end of the folding frame being connected to the first carriage body, and the other end of the folding frame being connected to the second carriage body; as well as A driving assembly is slidably mounted on a side of the first body and the second body away from the opening and can be retracted into the first body and the second body.
2. The portable transport vehicle for construction bidding documents as claimed in claim 1, characterized in that: The fixed carriage further includes a plurality of handles, and the handles are fixedly connected to one side of the first carriage body and the second carriage body.
3. The portable transport vehicle for construction bidding documents as claimed in claim 2, characterized in that: The folding frame includes a first mounting member and a second mounting member, the first mounting member is detachably mounted on a side of the first body away from the handle, the second mounting member is detachably mounted on a side of the second body away from the handle, one end of the folding cloth is connected to the first mounting member, and the other end of the folding cloth is connected to the second mounting member.
4. The portable transport vehicle for construction bidding documents as claimed in claim 3, characterized in that: The folding frame also includes a plurality of first contracting members, a plurality of second contracting members and a plurality of adapter members. The first contracting member can be rotatably mounted on the first mounting member, the second contracting member can be rotatably mounted on the second mounting member, and both the first contracting member and the second contracting member can be rotatably mounted on the adapter member.
5. The portable transport vehicle for construction bidding documents as claimed in claim 4, characterized in that: The adapter is hinged with a first rotating member and a second rotating member.
6. The portable transport vehicle for construction bidding documents as claimed in claim 5, characterized in that: The folding cloth is provided with a mounting hole near the opening, and the first rotating member and the second rotating member are installed through the mounting hole.
7. The portable transport vehicle for construction bidding documents as claimed in claim 5, characterized in that: The first rotating member and the second rotating member can rotate around the intersection between a first position and a second position, the first position is a vertical plane, and the second position is a horizontal plane.
8. The portable transport vehicle for construction bidding documents as claimed in claim 1, characterized in that: The driving assembly includes a slide plate, and the slide plate is slidably mounted on a side of the first body and the second body away from the opening.
9. The portable transport vehicle for construction bidding documents as claimed in claim 8, characterized in that: The driving assembly further comprises a plurality of steering shafts and a plurality of rollers. The steering shafts are rotatably mounted on the skateboard, and the rollers are rotatably mounted on the steering shafts.
10. The portable transport vehicle for construction bidding documents as claimed in claim 1, characterized in that: It also includes a spacer, which is detachably installed in the folding carriage and is used to separate different bidding documents.