KR102553292B1 - insulating ladder truck for operation and maintenance of traction line - Google Patents

Abstract

An insulated ladder car for catenary repair is disclosed. The catenary repair insulated ladder car includes a ladder frame 110 including a plurality of frames 111, 115, and 117 configured to be slidable; A bogie shaft 101 coupled to any one of the plurality of frames 111, 115, and 117; In order to prevent the ladder frame 110 from falling, a pair of roller units 140 formed at both ends of the bogie shaft 101 and coupled to each of the pair of rails 90; A pair of bogie wheels 100 formed on the bogie shaft 101 and disposed facing each of the pair of roller units 140; And a brake unit that provides braking force to the bogie shaft 101, a brake disc 102 installed on the bogie shaft 101 and located between the pair of bogie wheels 100, the brake disc 102 A brake unit including a brake pad 301 configured to contact the brake pad 301 and a hydraulic pressure generator 302 providing hydraulic pressure to the brake pad 301 .

Description

Insulating ladder truck for operation and maintenance of traction line}

The present invention relates to an insulated ladder truck for catenary repair operated on a railroad track where trains operate, and provides a structure that simultaneously improves the ease of on-site transportation and handling, the safety of workers, and can be conveniently used even in high-altitude work on flat ground. It relates to catenary repair and insulated ladder truck for high-altitude work on flat ground.

There is an insulated ladder truck for work used for new construction and maintenance of overhead catenary on railway tracks, but the existing product is heavy (120kg) and has a high ladder height, so it is difficult to balance when moving, making it difficult to transport to the work site. Excessive time is being taken to put in.
In addition, it is difficult to transport by vehicle and is left as an ugly object on the railside elements between stations, and the lifespan of FRP, the main material, is significantly shortened by exposure to direct sunlight, resulting in a decrease in durability.
The scaffolding at the top of the ladder is temporarily fixed with temporary materials, and safety handrails are not installed, so accidents caused by workers' mistakes frequently occur.
When working on the curved section of the track, the cant on the left and right of the rail causes fear in workers at height and there is a risk of ladder overturning.
As shown in Figure 1, the ladder car according to the prior art has an A-shaped frame 14 forming a pair on the left and right, front and rear sides, and a straight add-on ladder 15 so that it can go up to 5.5m, and becomes narrower toward the top. Since there was no work platform, a temporary scaffold was temporarily fixed and used.
The fixing brake 11 is separately installed on each bogie wheel 10, which is inconvenient for operation.

delete

delete

delete

delete

The present invention was conceived to solve the above problems, and the object of the invention is to prevent workers from falling accidents during the construction and maintenance of overhead catenary on the railway track, and to quickly transport and install a ladder truck with little force for convenience of work. to improve performance and safety.

In order to achieve the above object, in the present invention, the elevating ladder is composed of a three-step sliding frame, and is a trapezoidal insulated ladder composed of a ladder body and a bogie wheel, and is manufactured as two separate units to meet product unit standards. Since it is configured in a small size, it is easy to transport horizontally and light weight is realized by reducing the burden shared by each individual.
At the top, there is a horizontal work platform integrated with the frame, and the height can be adjusted at 30 cm intervals. When the auxiliary scaffolding is installed, a work space of more than 2m in the width direction is secured, and when the auxiliary scaffolding for expansion is installed in the longitudinal direction, it can be withdrawn by more than 1.2m, enabling work at high places even in areas that cannot be reached by the bogie wheels. It has a structure that can fundamentally prevent a fall accident by attaching a block.
The ladder car body can be easily and quickly raised and assembled by using the ladder car pulling device, and the safety of workers is secured by assembling the auxiliary footrest for upper expansion, safety handrails and safety blocks on the ground in advance, and the ladder car when moving uphill on the track. It is characterized by improved operator convenience so that it can be easily towed by using a pulling device.
It is characterized in that the hydraulic disc brake is installed in the middle of the wheel axis of the insulated ladder car to easily perform the anti-rolling function on the inclined track, and is formed in a structure that can lower the upper working platform while adjusting the brake when disassembling the main body.
Bogie wheels can be replaced with insulation wheels, conductive wheels, and tire wheels for flat terrain as needed, and a fall prevention auxiliary roller is installed on the outside of the wheel to prevent ladder overturning and Worker fall accidents can be prevented.
On flat ground, it is equipped with an outrigger to prevent falling and tire wheels for flat ground on the outside of the bogie wheel, so it can be used conveniently even in high-altitude work on flat ground.
According to the embodiments disclosed in this document, an insulated ladder car for catenary repair is disclosed. The catenary repair insulated ladder car includes a ladder frame 110 including a plurality of frames 111, 115, and 117 configured to slide with each other; A bogie shaft 101 coupled to any one of the plurality of frames 111, 115, and 117; In order to prevent the ladder frame 110 from falling, a pair of roller units 140 formed at both ends of the bogie shaft 101 and coupled to each of the pair of rails 90; A pair of bogie wheels 100 formed on the bogie shaft 101 and disposed facing each of the pair of roller units 140; And a brake unit that provides braking force to the bogie shaft 101, a brake disc 102 installed on the bogie shaft 101 and located between the pair of bogie wheels 100, the brake disc 102 A brake unit including a brake pad 301 configured to contact the brake pad 301 and a hydraulic pressure generator 302 providing hydraulic pressure to the brake pad 301.
In one embodiment, the ladder frame 110 is provided as a pair to face each other, and the roller unit 140 is provided from the body 141 into which the bogie shaft 101 is inserted, and the body 141 An auxiliary roller 144 extending toward the rail 90 may be included.
In one embodiment, in the catenary repair insulated ladder car, the pair of bogie wheels 100 partially contact the inside of the rail 90, and the auxiliary roller 144 is on the outside of the rail 90 By contacting, conduction from the rail 90 can be prevented.
In one embodiment, the roller unit 140 has a height configured to adjust the auxiliary roller 144 in the height direction of the rail 90 for close contact between the rail 90 and the auxiliary roller 144. An adjustment handle 142 and a depth adjustment handle 143 configured to adjust the auxiliary roller 144 in the width direction of the rail 90 may be further included.
In one embodiment, the roller unit 140 may further include a buffer coil 145 provided on the body to buffer the auxiliary roller 144.

According to the present invention, the ladder truck main body is composed of two units to which a three-stage sliding method is applied, and the accident and failure recovery time can be greatly reduced by quickly transporting and installing with little force, and the fall prevention auxiliary device is mounted on the wheel axle. By doing so, the risk of a fall accident is prevented in high-altitude work on tracks and flat ground, and the upper horizontal work platform and the auxiliary platform for extension are pre-assembled and raised from the ground, thereby increasing worker convenience and contributing to the prevention of safety accidents.

1 is a side view and a front view showing the configuration of an insulated ladder car in conventional use.
Figure 2 is a side view showing a sliding insulation ladder car according to an embodiment of the present invention.
Figure 3 is a front view of Figure 2;
Figure 4 is an exploded view of the ladder car body of Figure 2;
Figure 5 is a cross-sectional view showing a frame pattern of the sliding three-step ladder of Figure 2;
6 is a conceptual view, side view, and front view of a ladder pulling device for assembling the two separable body units of FIG. 2;
Figure 7 is a conceptual view and a front view (cross-sectional) and side views of the fall prevention auxiliary roller for preventing the fall in the width direction of FIG.
Fig. 8 is a perspective view of a pocket-type horizontal brace for fixing the two detachable body units of Fig. 2;
FIG. 9 is a perspective view of a horizontal frame of a sliding cart in which lower parts of the two detachable body units of FIG. 2 are fixed and objects are loaded thereon;
Figure 10 is a perspective view showing the configuration of the working scaffold and auxiliary scaffold connection for extension of Figure 2;
Figure 11 is a perspective view showing the configuration of the foldable additional ladder on the working scaffold of Figure 10;
Figure 12 is a perspective view showing the assembly shape of the working scaffold and the auxiliary scaffold extension, safety handrail of Figure 10;
13 is a perspective view and a side view of the auxiliary scaffold for extension of FIG. 10 mounted in the longitudinal direction;
14 is a perspective view showing the operating principle of the ladder brake of FIG. 3 and the position of the ladder pulling device traction hook;
Figure 15 is a front view and a side view showing a state in which the transmission device is mounted on the ladder pulling device of FIG.
16 is a side cross-sectional view and a front view of the ladder car body of FIG. 2 dismantled in a sliding manner and mounted on an auxiliary wagon for track transport.
17 is a side view illustrating a state in which the ladder car main body of FIG. 16 is loaded on a road transport vehicle;
18 is a plan view and a cross-sectional view of a tire mounted and an outrigger attached so that the ladder car of FIG. 3 can be used on a flat surface.
Figure 19 is a diagram and description showing the configuration of the ladder car assembly sequence of Figure 2.
Figure 20 is a diagram and description showing the ladder car lifting method and safety device installation configuration of Figure 2.
Figure 21 is a diagram and instructions showing the installation configuration of the ladder car fall prevention auxiliary roller and the upper work plate of FIG.

Safety facilities such as a working footrest, an auxiliary footboard for extension 151, and a safety handrail 170 are provided to secure a sense of stability and a safe working space for workers when performing work at heights of 4.5m or higher for the implementation of the present invention. For convenience of movement, the main body unit is divided into two, and the ladder frame 110 is configured to be slidable in three stages to make the unit size of the product small. By using a ladder truck pulling device, the main body of the ladder truck facing each other is pulled to the center and raised at the same time to assemble it. By pre-assembling facilities such as the upper work platform on the ground, the ladder truck can be configured and operated quickly and safely, and a roller to prevent tipping over. The unit 140 is installed to form a form that can fundamentally prevent overturning and fall accidents in high-altitude work on tracks and flat land.
Hereinafter, a description will be given in detail with reference to FIGS. 2 to 21 attached to the insulated ladder car for catenary repair according to the present invention.
Insulated ladder car for catenary repair is formed on a ladder frame 110, a bogie shaft 101 coupled to the ladder frame 110, and a bogie axle 101, and a bogie wheel 100 coupled to the rail 90 so as to be able to roll , And it is formed on the balance shaft 101 and may include a roller unit 140 for preventing the fall of the ladder frame 110.
In addition, the insulated ladder car for catenary repair is a pocket-type horizontal brace 130 for maintaining the lozenge shape of the ladder frame 110, a sliding bogie horizontal frame 137 for preventing shaking between the bogie axles 101, and a ladder frame 110 ) The ladder car pulling device 200 for assembly and upper gradient traction, the auxiliary foot plate 151 for upper expansion, the safety handrails 170, 171, 172, the auxiliary wagon 500 for track transportation, and the upper folding add-on ladder 160 can include more. The insulated ladder car for catenary repair is designed to be used by attaching the outrigger 600 and the tire 620 on flat ground.
Ladder frame 110 is located at the bottom, the first frame 111 located on the rail 90, the second frame 115 slidingly coupled to the first frame 111, sliding coupled to the second frame 115 It may include a third frame 117 to be. A bogie shaft 101, a bogie wheel 100, and a roller unit 140 are coupled to the first frame 111, and an auxiliary footrest 151 for upper expansion may be provided to the third frame 117.
The ladder frame 110 may be integrally configured with the bogie wheel 100, the brake disk 102, and the roller unit 140. Ladder frame 110 may be provided in two to face each other.
The ladder frame 110 applies a three-stage sliding method, the first frame 111 and the second frame 115 are engaged as shown in FIG. 5, and the third frame 117 is the second frame ( 115) It is installed inside and drawn out so that the height can be adjusted at intervals of 30 cm.
The ladder frame 110 composed of two units is placed on the rail 90 at a distance of about 10 m, the second frame 115 and the third frame 117 are pulled out, and the connecting pin 120 is inserted, Insert the fixing pin 121 so that it does not fall out, lift the central part of the ladder frame 110 to shoulder height, erect the horizontal brace 130 and temporarily support it with the strut 133.
Fix the safety handrail 170 to the upper working platform of the main body, hang the safety block on the connecting pin 120, and pull the hook to fasten it to the vicinity of the wheel of the ladder car.
When using the auxiliary scaffold 151 for extension, insert it into the guide 150 to align the center, tighten the fixing bolt 152, install and fix the safety handrail 171 to the scaffold, and insert the pin 172 into the rope ( 220) is carried out in advance from the ground.
The auxiliary scaffold 151 for expansion for widthwise operation can be fixed by being pushed into the guide 150 in the longitudinal direction by rotating 90 degrees, and the bogie wheel 100 touches the wall in a place where it is difficult to perform upper work at high places. use.
The ladder car pulling device 200 is installed at the center of the ladder frame 110 as shown in FIG. 6, the catch bar 201 is seated on one side of the rail, and the latch 201a is fixed on the opposite rail, and the rope 220 is attached to the ladder frame. (110) Remove the temporarily supported horizontal brace 130 while pulling the rope 220 with the pulling device 200 after connecting it to the rope drum 212 by hooking it to the central hook of both axles 101.
Pull the rope 220 with the ladder pulling device 200 until the ladder frame 110 has an inclination of 75 degrees, and when the pulling is finished, fix it with a pocket-type horizontal brace 130 at a height of 1.3m, and the first frame 111 Connect the sliding bogie horizontal frame 137 to the bogie axle 101, and hang the brake lever 304 of the brake disc 102 installed on the bogie shaft 101 to the fixing metal 305 to fix the wheel, and when shaking occurs due to lateral force X Install additional bracing.
The pocket-type horizontal brace 130 has a stepping jaw 133 attached to temporarily support the ladder frame 110 when ascending, and the member 132 has a structure that can enter the main member 131, and the length is adjustable. The length can be adjusted with the pin 135.
The sliding bogie horizontal frame 137 prevents shaking between both bogies facing each other, is composed of a sliding method capable of adjusting the length, and has a mesh net 139 attached to load various objects.
A foldable additional ladder 160 is installed on the upper working platform so that it can stand up to a height of 5.5 m, and is fixed with a safety handrail 170. At this time, the worker can prevent a fall accident by fastening the safety block installed in advance to the safety swing he/she wears and going up and down.
The fall-prevention auxiliary roller 144 is fitted and fixed to the bogie shaft 101 and has a structure that is caught on the lower jaw outside the head of the rail, and can prevent the fall of the ladder car, so that the auxiliary roller 144 is in close contact and buffered. It consists of a height adjustment handle 142, a depth adjustment handle 143, a buffer coil 145, and the like.
On flat land, the tire 620 is covered on the bogie wheel 100, the outrigger 600 is inserted and fixed to the bogie axle 101, and then the angle adjustment button 603 and the boom bars 604 and 605 are unfolded to raise the support plate 606 to the ground. support and use
Disassembly proceeds in the reverse order of installation, but be sure to fasten both brakes of the ladder frame 110, remove the sliding bogie horizontal frame 137 and horizontal brace 130, and adjust the brake on one side of the ladder frame 110. while slowly lowering the ladder. At this time, if there is a concern that the bogie wheel 100 slips on the rail surface and descends rapidly, install the ladder pulling device 200 as shown in FIG. Release slowly.
The ladder puller 200 is also used for assembly and disassembly of the ladder frame 110, and is installed at a point about 10m in the direction of travel when moving uphill on the track, so that it is easy to hang the rope 220 on the ladder frame 110 at the back and pull it. It is also used for towing purposes.
Ladder pulling device 200 can be rotated with electric power by mounting a spur gear 404 on an electric motor 402, a battery 401, and a rotating shaft 210, and a worker with weak physical strength can use it without effort. Optional convenience was promoted so that
The unit size of the product is small, so anyone can handle it easily, the structure is simple, the auxiliary wagon 500 is used on the track, and it can be easily transported by loading it on a 1-ton double cab truck on the road.
<Example>
Hereinafter, with reference to FIGS. 2, 3, 4, 7, and 14, an insulated ladder car for catenary repair according to an embodiment will be described.
In one embodiment, the catenary repair insulated ladder car may include a ladder frame 110, a bogie axle 101, a roller unit 140, a bogie wheel 100, and a brake unit. The roller unit 140 may be provided as a pair to be coupled to the rail 90 . The bogie wheel 100 may be provided as a pair to be coupled to the rail 90.
Referring to Figure 2, the ladder frame 110 may be provided as a pair to face each other. For example, the lower part of the ladder frame 110 (for example, the first frame 111) is formed with a bogie wheel 100 and a roller unit 140, and a pair of ladder frames 110 go to each other toward the top. They can be placed close together.
Referring to Figures 2, 3, and 4, the ladder frame 110 may include a plurality of frames (111, 115, 117) configured to slide with each other. The plurality of frames 111, 115, and 117 include a first frame 111 disposed at the bottom, a second frame 115 slidably coupled to the first frame 111, and a second frame 115 disposed at the top. A third frame 117 slidably coupled to the frame 115 may be included.
Referring to FIG. 3 , a bogie shaft 101 may be coupled to the first frame 111 . A bogie wheel 100 and a roller unit 140 may be formed on the bogie shaft 101 . For example, the roller units 140 may be provided as a pair by being formed at both ends of the bogie shaft 101, respectively. The bogie wheel 100 may roll along a rail (eg, the rail 90 of FIG. 7 ) and may be disposed facing the roller unit 140 . The roller unit 140 is located outside the rail (eg, the rail 90 of FIG. 7 ), and a part of the bogie wheel 100 may be located inside. Ladder frame 110 can move along the rail 90 by rolling the bogie wheel 100 is coupled to the rail.
Referring to FIGS. 3 and 14 , the brake unit may include a brake disc 102 , a hydraulic pressure generator 302 , and a brake pad 301 . The brake unit may be provided on each of the pair of ladder frames 110.
Referring to FIG. 14 , a brake disk 102 may be installed on a bogie shaft 101 and positioned between a pair of bogie wheels 100 . The brake disc 102 can rotate or stop together with the bogie shaft 101. A brake pad 301 may be coupled to the brake disk 102 . For example, brake pad 301 may be configured to rub against brake disc 102 . The brake pad 301 is connected to the hydraulic pressure generator 302 and hydraulic pressure may be applied to the brake pad 301 according to the operation of the hydraulic pressure generator 302 .
The brake pad 301 with hydraulic pressure may stop the rotation of the brake disk 102 by rubbing against the brake disk 102 . At this time, the bogie shaft 101 coupled to the brake disc 102 may also be stopped.
Referring to FIG. 7, the roller unit 140 is located outside the rail 90 and has a body 141 into which the bogie shaft 101 is inserted, and an auxiliary roller extending from the body 141 toward the rail 90. (144). The roller unit 140 may be provided on each of the pair of ladder frames 110 .
Referring to FIG. 7, the auxiliary roller 144 extends from the body 141 located outside the rail 90 toward the rail, and extends toward the outside of the rail 90 (eg, the left side of the rail shown in FIG. 7). can be contacted.
Referring to FIG. 7 , a portion of the bogie wheel 100 is located on the inside of the rail 90 (eg, on the right side of the rail shown in FIG. 7 ) and may contact the inside of the rail 90 . That is, the rail 90 may be positioned between a portion of the bogie wheel 100 and the body 141 of the roller unit 140.
As a result, the bogie wheel 100 partially contacts the inside of the rail 90, and the auxiliary roller 144 contacts the outside of the rail 90, so that the ladder frame 110 or the ladder car is removed from the rail 90. Conversion can be prevented.
In addition, the auxiliary roller 144 and the bogie wheel 100 may be coupled with the rail 90 interposed therebetween to guide the ladder car to move along the rail 90.
Referring to FIG. 7 , the roller unit 140 may include a height adjustment handle 142 and a depth adjustment handle 143 for adjusting the position of the auxiliary roller 144 .
The height adjustment handle 142 moves the auxiliary roller 144 in the height direction of the rail 90 (for example, in the vertical direction relative to the rail shown in FIG. 7) for close contact between the rail 90 and the auxiliary roller 144. It can be configured to adjust to.
The depth control handle 143 may be configured to adjust the auxiliary roller 144 in the width direction of the rail 90 (eg, in the left and right direction relative to the rail 90 shown in FIG. 7 ). By using the depth adjustment handle 143, the auxiliary roller 144 can correspond to the rails 90 of various heights.
Referring to FIG. 7 , the roller unit 140 may further include a buffer coil 145 provided on the body 141 to buffer the auxiliary roller 144 . The buffer coil 145 may be installed in a partially compressed state. The buffer coil 145 may provide elastic force in a direction toward the rail 90 to the auxiliary roller 144 . Thus, even when the ladder truck moves along a curved path, the auxiliary roller 144 can maintain contact with the outside of the rail 90 and prevent the ladder truck from tipping over.
According to the embodiments disclosed in this document, an insulated ladder car for catenary repair is disclosed. The catenary repair insulated ladder car includes a ladder frame 110 including a plurality of frames 111, 115, and 117 configured to slide with each other; A bogie shaft 101 coupled to any one of the plurality of frames 111, 115, and 117; In order to prevent the ladder frame 110 from falling, a pair of roller units 140 formed at both ends of the bogie shaft 101 and coupled to each of the pair of rails 90; A pair of bogie wheels 100 formed on the bogie shaft 101 and disposed facing each of the pair of roller units 140; And a brake unit that provides braking force to the bogie shaft 101, a brake disc 102 installed on the bogie shaft 101 and located between the pair of bogie wheels 100, the brake disc 102 A brake unit including a brake pad 301 configured to contact the brake pad 301 and a hydraulic pressure generator 302 providing hydraulic pressure to the brake pad 301.
In one embodiment, the ladder frame 110 is provided as a pair to face each other, and the roller unit 140 is provided from the body 141 into which the bogie shaft 101 is inserted, and the body 141 An auxiliary roller 144 extending toward the rail 90 may be included.
In one embodiment, in the catenary repair insulated ladder car, the pair of bogie wheels 100 partially contact the inside of the rail 90, and the auxiliary roller 144 is on the outside of the rail 90 By contacting, conduction from the rail 90 can be prevented.
In one embodiment, the roller unit 140 has a height configured to adjust the auxiliary roller 144 in the height direction of the rail 90 for close contact between the rail 90 and the auxiliary roller 144. An adjustment handle 142 and a depth adjustment handle 143 configured to adjust the auxiliary roller 144 in the width direction of the rail 90 may be further included.
In one embodiment, the roller unit 140 may further include a buffer coil 145 provided on the body to buffer the auxiliary roller 144.

delete

delete

delete

delete

delete

delete

delete

delete

delete

delete

delete

delete

delete

delete

90: railway rail
100: bogie wheel 101: bogie axle
102: brake disc 110: ladder frame
111: first frame 115: second frame
117: third frame 120: connecting pin
121: fixing pin 130: horizontal brace
131: Presence 132: Absence
133: step jaw 135: length adjustment pin
137: sliding bogie horizontal frame
139: mesh net 140: roller unit
141: body 142: height adjustment handle
143: depth control handle 144: auxiliary roller
145: buffer coil 150: guide
151: auxiliary footrest for expansion 152: fixing bolt
160: folding ladder 170: safety handrail
171, 172: safety handrail 172: pin
200: pull device 201: grip
210: rotation axis 212: rope drum
220: rope 301: brake pad
302: hydraulic generator 304: brake lever
305: clamp 401: battery
402: electric motor 404: spur gear
500: auxiliary wagon 600: outrigger
603: angle adjustment button 604, 605: boom bar

Claims (3)

In the insulation ladder car for catenary repair,
Ladder frame 110 including a plurality of frames (111, 115, 117) configured to slide with each other;
A bogie shaft 101 coupled to any one of the plurality of frames 111, 115, and 117;
A pair of roller units 140 formed at both ends of the bogie shaft 101 to prevent the ladder frame 110 from falling;
A pair of bogie wheels 100 formed on the bogie shaft 101, disposed facing each of the pair of roller units 140, and rolling along the rail 90; and
As a brake unit providing braking force to the bogie shaft 101, the brake disc 102 installed on the bogie shaft 101 and located between the pair of bogie wheels 100, the brake disc 102 and A brake unit including a brake pad 301 configured to rub, and a hydraulic pressure generator 302 providing hydraulic pressure to the brake pad 301; includes,
The ladder frame 110 is provided as a pair to face each other,
Each of the pair of roller units 140 has a body 141 into which the bogie shaft 101 is inserted and located outside the rail 90, and extends from the body 141 toward the rail 90. Including an auxiliary roller 144 to be,
In the catenary repair insulated ladder car, the pair of bogie wheels 100 partially contact the inside of the rail 90, and the auxiliary roller 144 contacts the outside of the rail 90, Conversion from the rail (90) is prevented,
Insulated ladder truck for catenary repair.
The method of claim 1,
The roller unit 140 is a height adjustment handle 142 configured to adjust the auxiliary roller 144 in the height direction of the rail 90 for close contact between the rail 90 and the auxiliary roller 144. ), and a depth control handle 143 configured to adjust the auxiliary roller 144 in the width direction of the rail 90.
The method of claim 2,
The roller unit 140 further comprises a buffer coil 145 provided on the body 141 for buffering the auxiliary roller 144.

Images