JP2017109282A - Mobile rack device for maintenance work - Google Patents

Abstract

PROBLEM TO BE SOLVED: To develop a new mobile rack device for maintenance work which can minimize a work flow line of a service mechanic.SOLUTION: A mobile rack device L for maintenance work is provided in a suspended state along a stall S for performing maintenance and inspection of a vehicle V with respect to a suspension rail 4 provided above the stall, and can move along the stall S. The mobile rack device L comprises a rack unit 1 for holding a service material M, and a traveling frame 5 suspending the rack unit from above and directly supported and moved by the suspension rail 4. The rack unit and the traveling frame 5 are connected through a rotation support mechanism J. In a plan view, the rack unit 1 is configured to be rotatably displaceable relative to the traveling frame 5.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a movable rack device for maintenance work that is useful when a vehicle having a long vehicle length such as a large truck is serviced.

  In a maintenance shop for large trucks, stalls with a service zone of about 1.5 to 2 meters are defined around the outside dimensions of the vehicle. When a large vehicle is maintained in such a stall, the distance that the service mechanic moves during work is significantly longer than that of a small vehicle due to the long length of the vehicle. For this reason, if it moves with the tool wagon indispensable for maintenance work, the labor required for movement cannot be ignored. In addition, it was pointed out that the tool wagon with a certain box shape tends to block the space around the vehicle in the stall.

Therefore, instead of the conventional tool wagon, a suspension rail is arranged above the stall, and a movable rack device is provided for storing the tool or the like in a suspended state from here, so that the tool can be moved easily, A device has been devised so that the surrounding space can be effectively secured (Patent Document 1, Patent Document 2).
As a result, many of the disadvantages of using the tool wagon type have been solved, but there is still room for improvement in terms of usability.

  That is, the arrangement position (movement position) of the mobile rack device is necessarily on the stall outer edge side, and there is a problem in taking out the tool in use. Specifically, in order to effectively store service materials such as tools, oils and fats, and short parts mounted on the mobile rack device, the inside of the rack device, that is, the vehicle side to be inspected and repaired, and the opposite outside That is, they are arranged dispersed on the outside of the stall. For this reason, the service mechanic must look back 180 ° when using the inner service material, and the service mechanic must go around the outside of the mobile rack each time the service material placed outside is used. Service materials such as tools had to be taken out, which also caused a reduction in overall work efficiency.

Japanese Unexamined Patent Publication No. 7-88783 Noto 3100012 publication

  The present invention has been made in consideration of these various backgrounds, and an object of the present invention is to develop a new mobile rack device for maintenance work that can suppress the service flow of service mechanics as much as possible.

  The mobile rack device for maintenance work according to claim 1 is provided in a suspended state with respect to a suspension rail provided above the stall for performing maintenance and inspection of the vehicle, and along the stall. A mobile rack apparatus for maintenance work configured to be movable, which is a rack unit that holds service materials and a rack unit that is suspended from above, and is supported by the suspension rail and moves. The rack unit and the traveling base are connected via a rotation support mechanism, and the rack unit is configured to be capable of rotational displacement with respect to the traveling base in a plan view. It consists of

  The movable rack apparatus for maintenance work according to claim 2 is characterized in that, in addition to the requirements of claim 1, the rotation support mechanism that is a connecting portion between the rack unit and the traveling base is provided in the rack unit in the width direction. It is characterized by being provided at a position deviated from the center position.

  According to a third aspect of the mobile rack apparatus for maintenance work according to the third aspect, in addition to the requirement according to the first or second aspect, the rack unit and the traveling base are connected via a suspension rod, A rotating support mechanism is provided at the connection portion of the lower end of the lower collar.

  In addition to the requirements described in claim 1, 2, or 3, the mobile rack device for maintenance work according to claim 4 includes a plurality of wheels guided by a pair of suspension rails arranged in parallel. At least three or more wheel units are arranged, and each wheel unit has a traveling wheel that moves on the suspension rail and a holding wheel that contacts the suspension rail and prevents the traveling platform from tilting. Is a feature.

  According to a fifth aspect of the mobile rack apparatus for maintenance work according to the fifth aspect, in addition to the requirements of the first, second, third, or fourth aspect, the rack unit includes a rack tray having a rectangular shape in plan view. A storage holder is disposed in the corner portion, and an arcuate portion of the storage holder constitutes a corner outer peripheral portion of the tray portion.

  According to the first aspect of the present invention, since the rack unit is configured to be able to be rotated and displaced as viewed from the service mechanic who is an operator, the service mechanic can be serviced by rotating the attitude of the rack unit. It can be arranged at a position facing the material, that is, close to the hand. Also, at this time, when the service mechanic faces the vehicle under maintenance, the rack unit can be arranged by selecting either the left or right side of the service mechanic, and the workability is good for both right-handed and left-handed Can be secured.

  According to the invention of claim 2, since the suspension position of the rack unit is offset from the center of the rack unit, for example, a long portion having a long free end is rotated and moved closer to the vehicle side. By arranging it, the service mechanic can obtain a more workable state. At this time, since the short part with a short free end distance faces the outside of the stall, even if the same moving rack device for maintenance work is similarly arranged on the adjacent stall, it can travel without interfering with each other. .

  According to the third aspect of the present invention, the rack unit and the traveling platform are provided with the rotation support mechanism at the lower end portion of the suspension rod, and the workability at the time of assembly is excellent. It is possible to reduce the downward load and contribute to smooth rotation of the rack unit.

  According to the invention described in claim 4, since the wheel unit in the traveling base is provided with the holding wheel that prevents the traveling base from tilting, the load on the rack unit supported by the traveling base is offset from the center. Even if it exists, the stable posture of the traveling platform can be maintained.

  According to the invention of claim 5, the corner portion of the rack unit has an arcuate shape, and even if the service mechanic inadvertently hits the part during work, the corner portion is sharp. No injuries or other injuries occur and safe work can be performed.

It is the perspective view which shows the use condition in the maintenance shop which installed the movable rack apparatus for maintenance work of this invention, and the one part enlarged view. It is explanatory drawing which shows the positional relationship with the vehicle in the use condition of the movable rack apparatus for maintenance work of this invention. It is explanatory drawing which shows the positional relationship with the vehicle in the non-use (retraction | saving) state of the movable rack apparatus for maintenance work of this invention. It is explanatory drawing represented from the vehicle side direction which shows the positional relationship with the vehicle in the use condition of the mobile rack apparatus for maintenance work of this invention. It is the front view which shows the rack unit for front wheels of the movable rack apparatus for maintenance work of this invention, and the front view which shows the rack unit for rear wheels. It is explanatory drawing which shows the action state of the rotation support mechanism provided in the lower end part of the suspension rod of this invention. It is sectional drawing which shows the attachment state of the traveling frame and suspension rail of this invention. It is explanatory drawing which shows other embodiment about the movement rack apparatus for maintenance work of this invention.

  The mode for carrying out the present invention includes one of the embodiments described below, and includes various modified and modified embodiments based on this technical idea.

Hereinafter, the mobile rack device for maintenance work according to the present invention will be described in detail based on the illustrated embodiment.
First, an outline of a use environment of a mobile rack device for maintenance work (hereinafter referred to as a mobile rack device L) will be described. As shown in FIG. 1, the movable rack apparatus L is configured to be movable while being suspended above a stall S which is a work space in a vehicle V maintenance shop. In this embodiment, the stall S has a relatively long longitudinal dimension because the vehicle V is a large truck. Specifically, for example, in the case of a large vehicle, the total length exceeds 10 meters, while the vehicle width is generally set to 2.5 meters according to the road transport vehicle law. About 0.5 to 2.0 meters (generally about 1.75 meters) is secured.
As a result, the space of the stall S is secured about 5 to 6 meters in the width direction, and the longitudinal dimension of the vehicle V may exceed 10 meters, and the dimension corresponding to that is secured. . The stall S includes a lift table T that supports the axle of the vehicle V and the like to raise and lower the vehicle V. Reference symbol P denotes a service mechanic that performs maintenance and inspection of the vehicle V.

Hereinafter, the mobile rack device L will be described.
As shown in FIGS. 1 to 4, the main members of the movable rack apparatus L are a rack unit 1 and a traveling base 2, and in this embodiment, the rack unit 1 is provided with a suspension rail 4 via a suspension rod 3. Is provided in a suspended state from the traveling gantry 2 that is supported for traveling.
First, the rack unit 1 will be described. The rack unit 1 includes a rack frame 10 as a strength member. As an example, this forms a gate shape, and an appropriate round portion is provided at both ends of the upper frame 10a, a pair of column frames 10b are arranged in the vertical direction, and the upper cross frame is formed so as to connect them. 10c and a lower cross frame 10d are provided.

Such a rack frame 10 is provided with a connection frame 11 as a part of the upper frame 10a as shown in FIG. The connection frame 11 is formed by connecting, for example, a so-called cheese-shaped steel pipe frame member provided as a general-purpose material by welding or the like as a part of the upper frame 10a, and a post portion 110 is formed.
An upper contact ring 111 is provided at the upper end of the post portion 110 extending above the connection frame 11, while the lower contact ring 112 is fixed to the outer fit by welding or the like at a position close to the lower upper frame 10a. . As an example, four catch grooves 113 are provided on the outer periphery of the ring 112 at the bottom. As will be described later, this is a structure for holding a fixed position when the rack unit 1 is displaced so as to turn with respect to the traveling base 2.

Various members for holding service materials M such as various tools, oils and fats, and replacement short parts are incorporated into the rack frame 10 as shown in FIG.
First, reference numeral 12 denotes a tool board, and a perforated metal plate is attached near the top of the rack frame 10. Using many holes of the tool board 12, various service materials M are provided to be latched as shown in FIG. Further, a rack tray 13 is supported on the upper cross frame 10c and the lower cross frame 10d. The rack tray 13 is a combination of an upper rack tray 13a supported by the upper cross frame 10c and a lower rack tray 13b supported by the lower cross frame 10d below the rack tray 13, but the number of stages may be increased or decreased as appropriate. Absent. The lower rack tray 13b is somewhat deeper than the upper rack tray 13a in consideration of the removal of the service material M stored therein, that is, perpendicular to the longitudinal direction of the upper cross frame 10c and the lower cross frame 10d. The dimension in the direction to be formed is formed large.

Each of the rack trays 13 has substantially the same configuration, and takes a form in which a storage holder 132 having all or part of its side curved in an arc shape or the like is attached to the corner portion of the tray portion 131. .
As shown by reference numeral 132a in FIGS. 1 and 5, the storage holder 132 is a bottomed cylindrical cup shape for holding a spray can or the like. An example is what constitutes a corner portion of the upper rack tray 13a. Further, as shown by reference numeral 132b, when the holding action needs to be relatively long (deep), for example, when storing an impact wrench or the like, a cylindrical storage holder without a bottom is attached to the lower rack tray 13b. It may be formed at the corner portion. Of course, in addition to these, the storage holder 132 having a bottomed cylindrical cup shape with a through hole in the center of the bottom plate may be used as an intermediate shape.
As a result, in the tray part 131, each corner part is normally sharply formed at a right angle. However, by arranging the arc-shaped side surface portion of the storage holder 132 at the corner part, The portion is eliminated, and this becomes a curved surface, which can improve safety during operation.
The tray portion 131 is provided with a partition angle 133 in consideration of reinforcement and attachment to the upper cross frame 10c and the lower cross frame 10d. Specifically, the upper cross frame 10c and the lower cross frame 10d are each provided with a receiving bracket 10e so as to protrude perpendicularly from the longitudinal direction thereof, and the tray portion 131 is fastened together with the partition angle 133 to the receiving bracket 10e. Fix in a shape like this. As a result, the tray portion 131 is firmly attached and a partition is formed, which contributes to the division of the service material M and the like.

Further, a tool box stay 15 is extended below the lower rack tray 13b, and the tool box 16 is fixed to be suspended by using the hook portion 151 thereof.
The tool box 16 can be used as a general-purpose box. For example, the tool box 16 uses a parts box used as a returnable box. 161 is formed. The handle 161 is locked to the hook portion 151 of the tool box stay 15, and a shelf is formed in a suspended state further below the lower rack tray 13b.

  Further, the rack unit 1 is provided with an auxiliary machine holder 17 below the column frame 10 b in the rack frame 10. This frame is formed such that a frame frame 172 projects laterally at the lower end of an extension frame 171 having a substantially equal diameter extending from the lower end of the column frame 10b via a connection socket 170. A cylindrical or round bar-like storage portion 173 is provided for the frame 172. The auxiliary machine that is substantially supported by the auxiliary machine holder 17 is a vehicle lift-up support attachment A for ensuring that the axle part of the vehicle V is lifted by the lift table T. Since this shape is different for the rear axle and the front axle, as shown in FIG. 5, it is preferable that the storage portion 173 has a shape that matches it appropriately.

Next, the traveling frame 2 and the suspension rod 3 for holding the rack unit 1 in the suspended state and moving and rotating the rack unit 1 will be described.
First, as shown in FIG. 1, the traveling gantry 2 is provided with a wheel unit 21 composed of a plurality of wheels at four corners with respect to a gantry frame 20 having a planar view frame shape. The wheel unit 21 includes a set of a traveling wheel 211 that travels on the wheel support surface 41 of the suspension rail 4 and a holding wheel 212 that contacts the lower surface of the suspension rail 4. The suspension rod 3 is provided so as to extend downward from a substantially center of the gantry frame 20 in the traveling gantry 2 via a gusset plate 31.

As shown in FIGS. 1 to 4, the suspension rod 3 is a pipe-shaped member having an inner diameter dimension that allows the post portion 110 of the connection frame 11 to be fitted inside the rack unit 1. A support block 32 is provided at the lower end. As shown in FIGS. 1 and 6, the support block 32 is a substantially short cylindrical member, and takes a form that is divided in half in the vertical direction. As a whole, it has a cylindrical shape. The upper surface of the support block 32 is used as a support surface 321, and a closing flange 322 is provided at the lower end of the support block 32 so that the outer diameter substantially matches the outer diameter of the hanging rod 3. Then, two female screw holes 323 are formed in each body portion of the support block 32. Correspondingly, a female screw hole 323 is formed in the hanging rod 3.
The support block 32 is fixed in a state of being fitted inside the hanging rod 3 by a fixing bolt 301 inserted from the screw hole 30 in the hanging rod 3.
In the hanging rod 3, a combination of a support block 32 and a fixing nut 33, a lock plunger 34, a plunger lock nut 35, etc., which will be described later, and the connection frame 11 in the rack unit 1 constitutes a rotation support mechanism J. . The rack unit 1 is configured to be rotatable in a plan view via a suspension rod 3 that is extended downward from the traveling frame 2 in a fixed state by the rotation support mechanism J. The assembled state will be further described later.

  Further, a fixing nut 33 is welded to the outside of the hanging rod 3 as shown in FIG. 6, and a lock plunger 34 is fixed below the hanging rod 3 by the fixing nut 33. That is, the lock plunger 34 is fixed by the plunger lock nut 35 by screwing the lock head, which is the working end thereof, from the fixing nut 33 so as to protrude inside the suspension rod 3. 11 is in contact with the catch groove 113 in FIG.

  Further, the suspension rail 4 that supports the movable rack device L will be described. As shown in FIG. 1 to FIG. 4 and FIG. 7, the suspension rail 4 uses an I-type beam as an example. The traveling frame 2 is supported using the flange plate of the beam, and the upper surface thereof is used as a wheel support surface 41 and the lower surface on the opposite side is used as a holding contact surface 42.

The constituent members of the mobile rack apparatus L of the present invention each have the structure as described above. First, the installation mode will be described.
First, in installation, as shown in FIGS. 1 to 4, the frame 20 in the traveling frame 2 is applied to an appropriate position with respect to the suspension rail 4 provided near the outer edge of the stall S, and the wheel unit 21, the traveling wheel 211 is placed on the wheel support surface 41. On the other hand, the holding wheel 212 is positioned so as to be accessible from below the holding contact surface 42, and the gantry frame 20 is movably supported by the two parallel suspension rails 4. In this state, the rack unit 1 is connected to the suspension rod 3 that extends downward from the gantry frame 20 to form the rotation support mechanism J. That is, as shown in FIG. 6, the post portion 110 of the connection frame 11 in the rack unit 1 is fitted inside the suspension rod 3, and in this state, the upper portion of the connection frame 11 in the rack unit 1 The ring 111 is in a state of smoothly contacting the inner surface of the hanging rod 3. Subsequently, the lower abutting ring 112 is further pushed upward from the lower end of the suspension rod 3 to be fitted therein, and then the two divided support blocks 32 are inserted between the post portion 110 and the inner surface of the suspension rod 3 respectively. To do. In this state, the support block 32 is formed at the lower end of the hanging rod 3 by screwing the fixing bolt 301 into the female screw hole 323 of the support block 32.
As a result, the support block 32 is configured to prevent the connection frame 11 from coming out of the rack unit 1, and the support surface 321 of the support block 32 supports the lower surface of the ring 112 against the lower part of the connection frame 11, and The unit 1 is supported so that the connection frame 11 is prevented from coming off and the rack unit 1 can rotate with respect to the hanging rod 3.
After this, as an example, the lock plunger 34 is screwed toward the inner peripheral side of the hanging rod 3 using the fixing nuts 33 at the four surroundings as an example. As a result, the front end of the ring comes into contact with the body portion of the ring 112 against the lower portion, and when this matches the catch groove 113 as shown in FIG. 6 (when locked), a constant click stop state is obtained.

  When the rack frame 10 thus installed is provided on the side of the stall S, the service material M necessary for the maintenance of the vehicle V is obtained using the rack tray 13 or the tool board 12 in the rack unit 1. Mount. When the maintenance location moves in the front-rear direction of the vehicle V, if the service mechanic P holds and pushes the rack unit 1 as appropriate, the traveling platform 2 rolls on the suspension rail 4 and moves appropriately. The rack unit 1 can be moved to the position. In actual maintenance work or the like by the service mechanic P, the rack unit 1 is placed at right angles to the traveling direction of the traveling platform 2 or appropriately so that the service mechanic P facing the vehicle V can easily access the service material M. It is preferable to rotate and use it so that it may face the angle. In this way, the service material M can be arranged at a position very close to the side portion of the service mechanic P.

In particular, when the connection position of the connection frame 11 is provided at a position deviated from the center in the width direction with respect to the upper frame 10a of the rack frame 10 as in the embodiment already described, the rack as shown in FIGS. The unit 1 projects sufficiently closer to the vehicle V than the normal traveling center position of the traveling platform 2, and access to the service material M is further improved.
In addition, even when taking the service material M on the opposite side of the rack board 1, for example, on the tool board 12, the service mechanic P does not need to move to the opposite side, and by further rotating the rack unit 1, The service material M and the like are easily taken out.
The arrangement position of the rack unit 1 can be selected according to the dominant hand of the service mechanic P, i.e., left-handed or right-handed.
Such usability is in the connection frame 11. As shown in FIG. 5, a preferred mode is obtained because the position where the rotation support mechanism J is formed is offset from the center position in the width direction of the rack frame 10. The support mechanism J may be disposed as a matter of course.

[Other Embodiments]
The mobile rack apparatus L of the present invention adopts a preferable form as described above, but the following modifications are possible.
(I) Air piping As shown in FIG. 8A, when a pipe-like suspension rod 3 is formed to extend from the traveling platform 2 and the rack frame 10 of the rack unit 1 is pipe-like, It is possible to form the service air pipe 5 by using.
First, generally in the vicinity of such a stall S, a compressed air pipe is provided for use of an air impact wrench for maintenance service, cleaning of various vehicles, and the like. Such an air pipe 5 can be arranged using the moving rack device L. That is, an introduction hose 51 provided from the upper side to the lower side of the suspension rod 3 is provided from the trolley hose 50 of the air pipe 5 that is configured to extend and contract substantially along the suspension rail 4, and the introduction hose. Air can be introduced at the lower end of 51 using the rack frame 10 of the rack unit 1.

  That is, by using the post portion 110 of the connection frame 11 of the rack unit 1, the upper end portion thereof is appropriately sealed, and the socket portion or the plug portion of the air joint 52 is provided, and the lower end of the introduction hose 51 corresponds to that. A socket part or a plug part is provided, and the air joint 52 and the introduction hose 51 are connected here. At this time, the air joint 52 itself can be rotated in a so-called swivel joint shape, and the hanging rod 3 is provided in a fixed state, and accordingly, the rack unit 1 is not allowed to twist the introduction hose 51. According to the rotation of the air joint 52. At this time, the rack frame 10 itself can be sealed into the lower end portion thereof, that is, the lower end portion of the column frame 10b, so that the inside of the rack frame 10 can be shaped like an air tank of a certain capacity. A nipple 53 is provided, and compressed air can be introduced from here to an appropriate air tool or the like.

Furthermore, as shown in FIG. 8B, the rack frame 10 and the connection frame 11 may be configured to be slidable without being fixed. That is, by making it possible to change the relative positions of the rack frame 10 and the connection frame 11, the installation position of the hanging rod 3 of the rack unit 1 can be adjusted as appropriate.
Similarly, the upper cross frame 10c and the lower cross frame 10d are bolted to the rack frame 10 with different members so that the installation position of the rack tray 13 can be changed due to the difference in the physique of the service mechanic P and the difference in the dominant hand. Modification is possible. In order to start the maintenance using such a movable rack device L, for example, the vehicle lift-up support attachment A provided in the auxiliary machine holder 17 as described above is appropriately applied to the axle of the vehicle V. It arrange | positions on the lift table T so that it may correspond to a position, The lift table T is raised after that, the vehicle V is raised and maintenance is performed.

(Ii) Aspects of use other than vehicle maintenance Since the mobile rack device L for maintenance work is most typically used in the field of vehicle maintenance, its state has been described. Even if it is in a fixed building or the like that is required, the same use is possible if the hanging rod 3 can be disposed in a erected state when a work space is provided on the side of the building.

L Mobile rack device S Stall T Lift table J Rotation support mechanism A Vehicle lift up support attachment V Vehicle P Service mechanic M Service material

DESCRIPTION OF SYMBOLS 1 Rack unit 2 Running stand 3 Suspension rod 4 Suspension rail 5 Air piping

DESCRIPTION OF SYMBOLS 1 Rack unit 10 Rack frame 10a Upper frame 10b Column frame 10c Upper cross frame 10d Lower cross frame 10e Receiving bracket 11 Connection frame 110 Post part 111 Ring per upper part 112 Ring per lower part 113 Catch groove 12 Tool board 13 Rack tray 13a Upper rack tray 13b Lower rack tray 131 Tray part 132 Storage holder 132a (Cup shape) Storage holder 132b (Cylindrical cage shape) Storage holder 133 Partition angle 15 Tool box stay 151 Hook part 16 Tool box 160 Box body 161 Handle 17 Auxiliary machine holder 170 Connection socket 171 Extension frame 172 Underframe frame 173 Storage part

2 Traveling frame 20 Mounting frame 21 Wheel unit 211 Traveling wheel 212 Holding wheel

3 Suspension rod 30 Screw hole 301 Fixing bolt 31 Gusset plate 32 Support block 321 Support surface 322 Closing flange 323 Female screw hole 33 Fixing nut 34 Lock plunger 35 Plunger lock nut

4 Suspension rail 41 Wheel support surface 42 Holding contact surface

5 Air piping 50 Trolley hose 51 Introduction hose 52 Air joint 53 Hose nipple

Claims (5)

A movable rack for maintenance work that is provided in a suspended state with respect to a suspension rail provided above the stall for performing maintenance and inspection of the vehicle and configured to be movable along the stall. An apparatus, comprising: a rack unit for holding service materials; and a traveling frame that is suspended from above and is supported by and directly supported by the suspension rail. Is connected via a rotation support mechanism, and the rack unit is configured to be able to be rotationally displaced with respect to the traveling base in plan view.
The rotation support mechanism, which is a connecting portion between the rack unit and the travel base, is provided at a position offset from the center position in the width direction of the rack unit. Mobile rack equipment for maintenance work.
The rack unit and the travel base are connected via a suspension rod, and a rotation support mechanism is provided at a connection portion between an upper frame of the rack frame and a lower end portion of the suspension rod. Or the mobile rack apparatus for maintenance work described in 2.
The traveling frame includes at least three or more wheel units composed of a plurality of wheel sets guided by a pair of suspension rails arranged in parallel, and each wheel unit travels on the suspension rail. The movable rack device for maintenance work according to claim 1, 2 or 3, further comprising a holding wheel that contacts the suspension rail and prevents the tilt of the traveling frame.
  The rack unit includes a rack tray having a rectangular shape in plan view. A storage holder is disposed at a corner portion of the tray portion, and an arc-shaped portion of the storage holder constitutes a corner outer peripheral portion of the tray portion. The mobile rack apparatus for maintenance work according to claim 1, 2, 3 or 4, wherein the mobile rack apparatus for maintenance work is provided.

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