CN219732692U - Work platform - Google Patents

Abstract

The utility model relates to a working platform which comprises an operation platform, a supporting component, a base and an adjusting piece, wherein one end of the supporting component is connected with the operation platform and used for supporting the operation platform; the base is provided with an adjusting groove; one end of the adjusting piece is connected with one end of the supporting component, which is far away from the operating platform, and the other end of the adjusting piece is arranged in an arc surface and extends into the adjusting groove, and the adjusting piece is movably connected with the base to adjust the angle between the supporting component and the base. During installation, assemble operation panel, supporting component, base and regulating part in well head department for the regulating part rotates in the adjustment tank according to the topography of different well heads department, makes supporting component be located vertical plane, thereby improves the supporting effect of supporting component to the operation panel. The operation platform can be adjusted according to the terrains at different wellheads, can adapt to various wellheads, improves the applicability of the operation platform, and reduces the cost for constructing the operation platform.

Description

Work platform

Technical Field

The utility model relates to the technical field of petroleum equipment, in particular to an operation platform.

Background

When the well site is operated, because the positions of the christmas tree and the well control system are higher, personnel cannot operate the well site, and tools such as a suspension cage and a lifter are required to operate the well site above the well head, so that the cost is higher, and the danger degree of high-altitude operation is higher.

Therefore, part of well sites weld simple operation tables on site according to wellhead conditions, and if the wellhead is replaced, another operation table is needed to be welded again, so that the operation cost is increased.

Disclosure of Invention

The utility model aims to provide a working platform which can be adjusted and installed according to different wellhead positions, so that the applicability of the working platform is improved, and the operation cost is reduced.

To this end, an embodiment of the present utility model provides an operation platform, including: an operation table; one end of the supporting component is connected with the operation table and is used for supporting the operation table; the base is provided with an adjusting groove; and one end of the adjusting piece is connected with one end, far away from the operating platform, of the supporting component, the other end of the adjusting piece is arranged in an arc surface and stretches into the adjusting groove, and the adjusting piece is movably connected with the base to adjust the angle of the supporting component and the base.

In one possible embodiment, the bottom of the adjustment groove is circular or conical.

In one possible implementation manner, the adjusting member is provided with a first limiting portion, the opening end of the adjusting groove is provided with a second limiting portion, and the second limiting portion is clamped with the first limiting portion so as to prevent the adjusting member from being separated from the adjusting groove.

In one possible embodiment, the side wall of the adjusting element is provided with a pry bar.

In one possible implementation, the support assembly includes: one end of the first rod is connected with the operation table, the first rod is provided with a plurality of connecting holes, and the connecting holes are distributed at intervals along the length direction of the first rod; a second rod provided with a fixing hole; and a fastener passing through the fixing hole and the connection hole and fixing the first rod and the second rod.

In one possible implementation, the support assembly further includes a mounting member disposed on the second rod distal from the console, the mounting member being threadably coupled to the adjustment member.

In one possible implementation manner, the mounting piece is provided with a third limiting portion, one end, away from the first limiting portion, of the adjusting piece is provided with a fourth limiting portion, and the third limiting portion is clamped with the fourth limiting portion so as to prevent the mounting piece from being separated from the adjusting piece.

In one possible implementation manner, the supporting components are provided with a plurality of reinforcing pieces and are arranged on the side of the operation table, and the two ends of each reinforcing piece are respectively connected with two adjacent supporting components.

In one possible implementation, the device further comprises a ladder, the ladder comprising: one end of the upper ladder is connected with the operating platform; and a lower ladder which is connected with the upper ladder in a sliding way.

In one possible implementation, the ladder further includes a cage connected with the upper ladder to form a protection cavity.

The working platform provided by the embodiment of the utility model comprises an operation platform, a supporting component, a base and an adjusting piece, wherein one end of the supporting component is connected with the operation platform and is used for supporting the operation platform; the base is provided with an adjusting groove; one end of the adjusting piece is connected with one end of the supporting component, which is far away from the operating platform, and the other end of the adjusting piece is arranged in an arc surface and extends into the adjusting groove, and the adjusting piece is movably connected with the base to adjust the angle between the supporting component and the base. During installation, assemble operation panel, supporting component, base and regulating part in well head department for the regulating part rotates in the adjustment tank according to the topography of different well heads department, makes supporting component be located vertical plane, thereby improves the supporting effect of supporting component to the operation panel. The operation platform can be adjusted according to the terrains at different wellheads, can adapt to various wellheads, improves the applicability of the operation platform, and reduces the cost for constructing the operation platform.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the present utility model, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art. In addition, in the drawings, like parts are designated with like reference numerals and the drawings are not drawn to actual scale.

Fig. 1 shows a schematic structural diagram of an operation platform according to an embodiment of the present utility model;

FIG. 2 shows a schematic structural view of a support assembly and a base provided by an embodiment of the present utility model;

FIG. 3 illustrates a cross-sectional view of a support assembly and base provided by an embodiment of the present utility model;

fig. 4 shows a schematic structural view of a ladder stand according to an embodiment of the present utility model.

Reference numerals illustrate:

1. an operation table; 11. a bottom plate; 12. guard bars; 121. an inlet and an outlet; 122. an iron chain; 2. a support assembly; 21. a first lever; 211. a connection hole; 22. a second lever; 221. a fixing hole; 23. a fastener; 24. a mounting member; 241. a third limit part; 3. a base; 31. an adjustment tank; 32. a second limit part; 4. an adjusting member; 41. a first limit part; 42. a crow bar; 43. an adjustment aperture; 44. a fourth limit part; 5. a reinforcing member; 6. a ladder stand; 61. ascending a ladder; 62. descending a ladder; 63. a protective cage; 64. nylon backing plate.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Fig. 1 shows a schematic structural diagram of an operation platform provided by an embodiment of the present utility model, fig. 2 shows a schematic structural diagram of a support assembly and a base provided by an embodiment of the present utility model, and fig. 3 shows a cross-sectional view of a support assembly and a base provided by an embodiment of the present utility model.

As shown in fig. 1 to 3, an embodiment of the present utility model provides a working platform, which includes an operation console 1, a support assembly 2, a base 3, and an adjusting member 4, wherein one end of the support assembly 2 is connected with the operation console 1 and is used for supporting the operation console 1; the base 3 is provided with an adjusting groove 31; one end of the adjusting piece 4 is connected with one end, far away from the operation table 1, of the supporting component 2, the other end of the adjusting piece 4 is arranged in an arc surface and stretches into the adjusting groove 31, and the adjusting piece 4 is movably connected with the base 3 to adjust the angle between the supporting component 2 and the base 3.

It should be understood that the operation table 1 is used for an operator to work, the operation table 1 includes a bottom plate 11 and a guardrail 12, and the bottom plate 11 may be formed by forming an operation opening on a whole plate, or may be formed by splicing a plurality of pedals. In one example, the base plate 11 includes a plurality of pedals, and the plurality of pedals are rotatably connected or slidably connected, so that the base plate 11 is stored in the process of carrying, the volume occupied by the working platform in the carrying process is reduced, and the carrying convenience of the working platform is improved.

The guard rail 12 is provided around the periphery of the base plate 11, thereby protecting the operator. The guard rail 12 may be formed by bending a plate-shaped or net-shaped material, or may be formed by splicing a plurality of plate-shaped or net-shaped materials. The guardrail 12 and the bottom plate 11 may be connected by welding, integral molding, or by plugging, bolting, or screwing. For ease of handling, in one example, the guard rail 12 is formed from a plurality of plates or mesh materials that are joined together, and the guard rail 12 is detachably connected to the base plate 11. In order to facilitate the operator to get in and out of the operation platform 1, an inlet and outlet 121 and an iron chain 122 are arranged at the inlet and outlet 121, two ends of the iron chain 122 are respectively connected with two adjacent guardrails 12, wherein at least one section of the iron chain 122 is detachably connected with the guardrails 12, so that the convenience of the operator in and out is improved, and the safety of the operator during working is also improved.

Wherein, the bottom or the side part of the bottom plate 11 can be provided with reinforcing ribs, thereby improving the strength of the bottom plate 11 and further improving the safety of operators. And the bottom plate 11 can be provided with two movable cross beams, the movable cross beams are connected with the bottom plate 11 through male and female lug plates, and pedals are arranged between the two movable cross beams. The pedal is provided with a handle, so that the pedal is convenient to detach and install.

The work platform further comprises a supporting component 2, one supporting component 2 can be arranged, a plurality of supporting components can be arranged, and one end of the supporting component 2 is connected with the operation platform 1, so that the operation platform 1 is supported.

The operation platform further comprises a base 3 and an adjusting piece 4, the base 3 is arranged on the ground, in order to further improve the supporting effect on the operation platform 1, the base 3 comprises a chassis, and the chassis is plate-shaped, can be circular plate-shaped or other plate-shaped, so that the contact area between the base 3 and the ground is increased, and the supporting effect of the base 3 is improved. One end of adjusting part 4 is connected with one end of supporting component 2 away from operation panel 1, is connected with the lower extreme of supporting component 2 promptly, and the other end of adjusting part 4 is the cambered surface setting and stretches into in the adjustment tank 31, adjusting part 4 and base 3 swing joint, and adjusting part 4 can rotate or crook in adjustment tank 31 promptly to adjust the angle of supporting component 2 and base 3.

During installation, the operation panel 1, the support component 2, the base 3 and the adjusting piece 4 are assembled at the wellhead, and the adjusting piece 4 can rotate in the adjusting groove 31 according to the terrains of different wellhead positions, so that the support component 2 is positioned in the vertical plane, and the support effect of the support component 2 on the operation panel 1 is improved. The operation platform can be adjusted according to the terrains at different wellheads, can adapt to various wellheads, improves the applicability of the operation platform, and reduces the cost for constructing the operation platform.

In some alternative embodiments, the bottom of the adjustment slot 31 is rounded or conical, thereby facilitating the rotation of the adjustment member 4 in the adjustment slot 31. In one example, the bottom of the adjustment groove 31 is conical to facilitate machining.

The base 3 further comprises a fixed cylinder, the fixed cylinder and the chassis are integrally formed, the adjusting groove 31 is located at the fixed cylinder, and the opening direction of the adjusting groove 31 is away from the chassis. Further, the outer peripheral side of the fixed cylinder is provided with a plurality of reinforcing blocks, and the plurality of reinforcing blocks are arranged around the outer peripheral side of the fixed cylinder, so that the strength and stability of the base 3 are improved.

In some alternative embodiments, the adjusting member 4 is provided with a first limiting portion 41, the open end of the adjusting slot 31 is provided with a second limiting portion 32, and the second limiting portion 32 is engaged with the first limiting portion 41 to avoid the adjusting member 4 from being separated from the adjusting slot 31. Wherein, regulating part 4 is provided with first spacing portion 41, and first spacing portion 41 can be by regulating part 4 indent formation also can be by regulating part 4 evagination formation, and the open end of adjustment tank 31 is provided with second spacing portion 32, and second spacing portion 32 is sunken to form also can be the protrusion formation, and second spacing portion 32 and first spacing portion 41 block to avoided regulating part 4 to break away from adjustment tank 31.

In one example, the first limiting portion 41 is formed by the adjusting member 4 protruding outwards and is in an annular shape, the second limiting portion 32 is formed by the inner wall of the adjusting groove 31 recessed inwards and is also in an annular shape, the base 3 may be formed by two half seats, and when in installation, the adjusting member 4 is placed in one half seat, and then the other half seat is fixedly connected. Thereby engaging the first stopper 41 with the second stopper 32.

In one example, the first limiting portion 41 is concavely formed by the adjusting member 4, the second limiting portion 32 is annular, and the inner diameter of the second limiting portion 32 is smaller than the inner diameter of the adjusting groove 31, so that the first limiting portion 41 is engaged. The second limiting portion 32 is formed by two semi-ring surrounding structures, and the second limiting portion 32 is detachably connected with the base 3. When in installation, the adjusting piece 4 is firstly placed in the adjusting groove 31, then the two semi-rings encircle the first limiting part 41 to form the second limiting part 32, and the second limiting part 32 is connected with the base 3 through bolts.

In some alternative embodiments, the side wall of the adjusting member 4 is provided with a pry bar 42, where the pry bar 42 may be fixedly connected to the adjusting member 4 or may be detachably connected to the adjusting member 4, in one example, the adjusting member 4 is provided with an adjusting hole 43, the adjusting hole 43 may radially penetrate the adjusting member 4 or may not penetrate the adjusting member 4, and the pry bar 42 extends into the adjusting hole 43, so as to correspondingly adjust the positions of the adjusting member 4 and the base 3.

In some alternative embodiments, the support assembly 2 includes a first rod 21, a second rod 22, and a fastener 23, one end of the first rod 21 is connected to the console 1, the first rod 21 is provided with a plurality of connection holes 211, and the plurality of connection holes 211 are arranged at intervals along the length direction of the first rod 21; the second lever 22 is provided with a fixing hole 221; the fastener 23 passes through the fixing hole 221 and the connection hole 211 and fixes the first lever 21 and the second lever 22.

The support assembly 2 includes a first lever 21 and a second lever 22, one end of the first lever 21 is connected with the operation table 1 to support the operation table 1, the first lever 21 is provided with a plurality of connection holes 211, and the plurality of connection holes 211 are arranged at intervals along the length direction of the first lever 21. The second lever 22 is provided with fixing holes 221, and the fixing holes 221 may be provided one or more, and if the fixing holes 221 are provided in plurality, the plurality of fixing holes 221 are provided at intervals along the length direction of the second lever 22. The position of the fixing hole 221 may be the end of the second rod 22 facing the first rod 21 or the middle of the second rod 22, and the present utility model is not limited to the position of the fixing hole 221. Wherein the first rod 21 is connected with the second rod 22 in a sleeved mode, i.e. the first rod 21 can be provided with an inner cavity, the second rod 22 extends into the inner cavity of the first rod 21, or the second rod 22 is provided with an inner cavity, and the first rod 21 extends into the inner cavity of the second rod 22.

The support assembly 2 further includes a fastener 23, the fastener 23 being a through pin or a pin shaft, the fastener 23 passing through the connection hole 211 and the fixing hole 221 to connect the first rod 21 with the second rod 22.

When the well head is installed, an operator can adjust the relative positions of the first rod 21 and the second rod 22 according to the height required at the well head, then align the connection hole 211 with the fixing hole 221, and pass the connection hole 211 and the fixing hole 221 through the fastener 23, thereby connecting the first rod 21 with the second rod 22. The utility model further improves the applicability of the utility model by arranging the first rod 21 and the second rod 22 so that the height of the working platform can be adjusted.

Further, lifting lugs are arranged at the upper ends of the first rod 21 and the second rod 22, so that the operation platform can be conveniently installed and detached.

In some alternative embodiments, the support assembly 2 further comprises a mounting member 24 disposed on the second rod 22 remote from the console 1, the mounting member 24 being threadably connected to the adjustment member 4. Wherein, mounting piece 24 is connected with second pole 22, can be fixed connection or detachable connection, and mounting piece 24 is provided with the screw thread, and regulating part 4 is also provided with the screw thread, and the screw thread of mounting piece 24 and regulating part 4 is trapezoidal screw thread. The mounting piece 24 is in threaded connection with the adjusting piece 4, if the mounting piece 24 is provided with an inner cavity, the threads of the mounting piece 24 are inner threads, the threads of the adjusting piece 4 are outer threads, and the adjusting piece 4 stretches into the inner cavity of the mounting piece 24 to be in threaded connection with the mounting piece 24; if the adjusting member 4 is provided with an inner cavity, the thread of the adjusting member 4 is an internal thread, the thread of the mounting member 24 is an external thread, and the mounting member 24 extends into the inner cavity of the adjusting member 4 to be in threaded connection with the adjusting member 4. The mounting piece 24 is in threaded connection with the adjusting piece 4, so that the length of the supporting component 2 can be adjusted in a miniature mode, and the adjusting accuracy of the supporting component 2 is further improved.

In one example, the second rod 22 is provided with an inner cavity, the mounting member 24 is sleeved on the second rod 22, one end of the adjusting member 4 away from the base 3 extends into the inner cavity of the mounting member 24, and the inner cavity of the second rod 22 is in threaded connection with the mounting member 24.

In some alternative embodiments, the mounting member 24 is provided with a third limiting portion 241, and the end of the adjusting member 4 away from the first limiting portion 41 is provided with a fourth limiting portion 44, and the third limiting portion 241 is engaged with the fourth limiting portion 44 to avoid the mounting member 24 from being separated from the adjusting member 4. The mounting member 24 includes a flange and a flange nut, the flange is sleeved on the outer peripheral side of the second rod 22 and is fixedly connected with the second rod 22, the flange nut is arranged at the lower end of the flange and is connected with the flange through a bolt, the inner cavity of the flange nut is communicated with the inner cavity of the second rod 22, the inner diameter of the flange thread is smaller than the inner diameter of the second rod 22 to form a third limiting portion 241, one end of the adjusting member 4, which is far away from the first limiting portion 41, is provided with a fourth limiting portion 44 through the bolt, and the diameter of the fourth limiting portion 44 is larger than the inner diameter of the flange nut, so that the third limiting portion 241 can be clamped with the fourth limiting portion 44, and the adjusting member 4 is prevented from being separated from the mounting member 24.

In some alternative embodiments, the support assemblies 2 are provided in plurality and disposed on the side of the console 1, and further include a plurality of reinforcing members 5, and two ends of the reinforcing members 5 are respectively connected to two adjacent support assemblies 2. The support assembly 2 is provided with a plurality of support assemblies and is distributed around the side of the operation console 1 at intervals, in one example, the bottom plate 11 of the operation console 1 is rectangular, the support assemblies 2 are provided with four support assemblies, and the four support assemblies 2 are respectively located at four corners of the operation console 1, so that the support effect of the support assemblies 2 on the operation console 1 is improved.

Still include a plurality of reinforcement 5, reinforcement 5 is the strip setting, and reinforcement 5 is located between two adjacent supporting component 2, and both ends are connected with two supporting component 2 respectively to improve intensity and the supporting effect between a plurality of supporting component 2.

In one example, four reinforcing members 5 are provided, four reinforcing members 5 are respectively positioned between four support assemblies 2, two ends of each reinforcing member 5 are respectively connected with two adjacent second bars 22, and the reinforcing members 5 may be inclined or positioned in a horizontal plane, and the inclination angle of the reinforcing members 5 is not limited by the present utility model.

Referring to fig. 1 and 4, fig. 4 shows a schematic structural view of a ladder stand according to an embodiment of the present utility model. In some alternative embodiments, the work platform further comprises a ladder stand 6, wherein the ladder stand 6 comprises an upper ladder 61 and a lower ladder 62, wherein one end of the upper ladder 61 is connected with the operation table 1, and the lower ladder 62 is slidably connected with the upper ladder 61. The upper end of the upper ladder 61 is connected with the operation table 1 and is positioned at an inlet and outlet 121 of the operation table 1, so that an operator can conveniently go in and out. Lower ladder 62 and last ladder 61 sliding connection can be provided with the cat ladder mounting bracket between going up ladder 61 and the lower ladder 62, and can set up a plurality of through-holes at last ladder 61 or lower ladder 62, a plurality of through-holes are arranged along the direction of height interval of cat ladder 6, go up ladder 61 and lower ladder 62 and pass through round pin axle or bolt connection, thereby adjust the position of lower ladder 62 and last ladder 61, make the length adaptation of going up ladder 61 and lower ladder 62 be in the height of operation panel 1, the operator of being convenient for scrambles, can be provided with nylon backing plate 64 at the lower extreme of last ladder 61, nylon backing plate 64 is provided with the gliding sliding tray of confession lower ladder 62, improve the gliding stability of going up ladder 61 and lower ladder 62.

In some alternative embodiments, the ladder 6 further comprises a protective cage 63, the protective cage 63 being connected with the upper ladder 61 to form a protective cavity, thereby protecting the safety of the operator when climbing.

It should be noted that references in the specification to "one embodiment," "an example embodiment," "some embodiments," etc., indicate that the embodiment described may include a particular feature, structure, or characteristic, but every embodiment may not necessarily include the particular feature, structure, or characteristic. Moreover, such phrases are not necessarily referring to the same embodiment. Furthermore, when a particular feature, structure, or characteristic is described in connection with an embodiment, it is submitted that it is within the knowledge of one skilled in the art to effect such feature, structure, or characteristic in connection with other embodiments whether or not explicitly described.

It should be readily understood that the terms "on … …", "above … …" and "above … …" in this disclosure should be interpreted in the broadest sense such that "on … …" means not only "directly on something", but also includes "on something" with intermediate features or layers therebetween, and "above … …" or "above … …" includes not only the meaning "on something" or "above" but also the meaning "above something" or "above" without intermediate features or layers therebetween (i.e., directly on something).

Further, spatially relative terms, such as "below," "beneath," "above," "over," and the like, may be used herein for ease of description to describe one element or feature's relationship to another element or feature as illustrated. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. The device may have other orientations (rotated 90 degrees or at other orientations), and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that in this document, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model.

Claims (10)

1. A work platform, comprising:

an operation table;

one end of the supporting component is connected with the operation table and is used for supporting the operation table;

the base is provided with an adjusting groove; and

one end of the adjusting piece is connected with one end, far away from the operating platform, of the supporting component, the other end of the adjusting piece is arranged in an arc surface mode and stretches into the adjusting groove, and the adjusting piece is movably connected with the base to adjust the angle of the supporting component and the base.

2. The work platform of claim 1, wherein the bottom of the adjustment slot is arcuate or conical.

3. The work platform of claim 1, wherein the adjustment member is provided with a first limiting portion, and the open end of the adjustment slot is provided with a second limiting portion, and the second limiting portion is engaged with the first limiting portion to prevent the adjustment member from being separated from the adjustment slot.

4. The work platform of claim 1, wherein the side wall of the adjustment member is provided with a pry bar.

5. A work platform according to claim 3, wherein the support assembly comprises:

one end of the first rod is connected with the operation table, the first rod is provided with a plurality of connecting holes, and the connecting holes are distributed at intervals along the length direction of the first rod;

a second rod provided with a fixing hole; and

and a fastener passing through the fixing hole and the connecting hole and fixing the first rod and the second rod.

6. The work platform of claim 5, wherein the support assembly further comprises a mounting member disposed on the second rod distal from the console, the mounting member being threadably coupled to the adjustment member.

7. The work platform of claim 6, wherein the mounting member is provided with a third limiting portion, a fourth limiting portion is provided at an end of the adjusting member away from the first limiting portion, and the third limiting portion is engaged with the fourth limiting portion to prevent the mounting member from being separated from the adjusting member.

8. The work platform of claim 1, wherein the support assembly is provided in plurality and disposed on an edge side of the console, and further comprising a plurality of reinforcing members, wherein two ends of the reinforcing members are respectively connected to two adjacent support assemblies.

9. The work platform of claim 1, further comprising a ladder, the ladder comprising:

one end of the upper ladder is connected with the operating platform; and

and the lower ladder is connected with the upper ladder in a sliding manner.

10. The work platform of claim 9, wherein the ladder further comprises a cage coupled to the upper ladder to form a protective cavity.