JP2014037742A - Snow remover - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a snow remover which improves workability and safety in removing snow.SOLUTION: A snow remover 1 comprises: a plurality of support poles 4 installed around a house 2; a pair of beams 12 installed between the upper parts of the support poles 4; a ridge roller 17a extending in parallel with a ridge part 8 with its both ends rotatably supported by the beams 12; an eaves roller 17b extending in parallel with an eaves part 9 with its both ends rotatably supported by the beams 12; an endless sheet 28 rolled by the rollers; a motor 25 with a brake which gives turning force to the ridge roller 17a when supplied with actuation electric power, and gives brake force to the ridge roller 17a when not supplied with actuation electric power; sprockets 21 disposed at each ends of the rollers 17; and a chain which is attached to an inside surface of the sheet 28 and engages with each of the sprockets 21.

Description

  The present invention relates to a snow lowering device, and more particularly to a snow lowering device that allows an operator to lower snow that has accumulated on a roof to the eaves without climbing the roof.

  In heavy snowfall areas in mountainous areas and cold regions, “snow lowering work” is frequently performed during the winter season to prevent the houses from collapsing due to snow falling on the roof. This snow-removal work is a labor-intensive work that is carried out by manpower, and because the work is performed on a sloped roof that has become frozen due to freezing of snow, there is a risk that an operator may fall from the roof during the work. It is accompanied by.

  Therefore, a snow melting device that melts snow on the roof to prevent snow from accumulating on the roof, specifically, a device in which a heater is embedded in the roof material or a heat radiating panel is laid on the roof surface has been proposed. ing. However, these snow melting devices need to be continuously operated during the winter to prevent snow from accumulating on the roof, and consume a lot of electric power and kerosene to move the snow melting device, The economic burden on the installer may increase.

  The applicant of the present application has already proposed a snow lowering device that can lower snow on the roof to the eaves relatively easily and can greatly reduce the economic burden on the installer (Patent Document 1). reference). More specifically, a ridge roller disposed on the roof ridge portion, an eave roller disposed on the roof eave portion, and is wound around and stretched between the rollers. The endless sheet and a handle for manually rotating the roller are provided, and the endless sheet is moved around by rotating the ridge roller and the eaves roller. As a result, the snow that has fallen on the sheet moves toward the eaves as the ridge roller and eaves roller rotate, and finally leaves the sheet at the eaves part and falls toward the eaves. . As a result, the snow falling on the roof can be lowered relatively easily without the operator climbing the roof and suppressing the consumption of electric power and kerosene. Therefore, there is no danger in the work.

  However, in the case of the above-described snow lowering device, the handle connected to the eaves roller is manually rotated to circulate the sheet, and when a large amount of snow has fallen on the sheet, the handle depends on the weight of the snow applied to the sheet. A large force may be required to rotate the.

  Here, the sheet of the snow lowering device is stretched along the inclination direction of the roof. Therefore, the snow on the seat has a force from the ridge side toward the eave side. Accordingly, the sheet turning operation can be performed relatively easily. However, there is a possibility that the sheet naturally starts to circulate due to the weight of snow. As a result, the snow on the seat may slide down from the roof to the eaves at a time, which may damage the house and threaten worker safety. Further, there is a possibility that the handle connected to the seat rotates at a high speed in conjunction with the fall of the snow.

  In view of the above circumstances, an object of the present invention is to provide a snow lowering device that improves workability and safety in snow lowering work.

  In order to solve the above-described problems, a snow lowering apparatus according to the present invention includes a pair of ridge-side columns that are erected on both sides of the roof ridge from the ground around the house and are higher than the ridge. And a pair of eaves-side struts that are higher than the eaves portion, and are arranged on both sides of the eaves portion of the roof from the ground around the house, and one of the ridge-side struts and the eaves-side struts, respectively. A pair of horizontal members erected on one upper side of the roof, a ridge roller disposed along the ridge portion of the roof and rotatably supported by the pair of horizontal members, and an eave portion of the roof And an eaves roller rotatably supported by the pair of horizontal members, wound around the ridge roller and the eaves roller, and stretched above the roof surface of the roof Connected to the endless sheet and the ridge roller or eave roller A motor with a brake that applies a rotational force to the ridge roller or the eaves roller when power is supplied, and restricts the rotation of the ridge roller or the eaves roller when no operating power is supplied; A pair of ridge-side sprockets provided at each end of the ridge roller, a pair of eaves-side sprockets provided at each end of the eaves roller, and attached to the sheet inner surface of the sheet, A chain meshing with the ridge-side sprocket and the eaves-side sprocket ”.

  Here, the shapes of the “ridge-side column” and the “eave-side column” are not particularly limited, but may be, for example, a cylindrical or prismatic columnar body. In addition, in order to install the ridge-side column and eaves-side column on the ground around the house, for example, drill holes in the ground and build a foundation to support the ridge-side column and the eaves-side column. can do. A plurality of columns having different heights may be disposed between the building-side column and the eaves-side column in accordance with the inclination of the roof.

  For example, H-shaped steel can be used as the horizontal member, and the horizontal member is arranged to be parallel to the inclination direction of the roof (that is, to be equal to the inclination of the roof).

  Further, it is preferable that the “ridge roller” and the “eave roller” substantially coincide with the length in the lateral direction (width direction) of the roof surface. Moreover, you may provide the one or some intermediate | middle roller by which the both ends were rotatably supported by the pair of horizontal member between the ridge part roller and the eaves part roller, respectively.

  Further, the “sheet” is an endless shape wound around the ridge roller and the eaves roller, but may be configured to be removable from the ridge roller and the eaves roller. For example, one end side and the other end side of one sheet may be endless (annular in cross section) via a fastener. Thereby, one end side and the other end side of the sheet are separated by opening the fastener, and it becomes easy to remove the sheet from the ridge roller and the eaves roller, and the sheet is wound around the ridge roller and the eaves roller. Will also be easier.

  For example, a “motor with a brake” may employ a configuration in which when a voltage supply to a coil is cut off, a movable iron core is pressed against a brake lining by a spring, and rotation of the rotating shaft of the motor is restricted. it can. As the “motor”, a so-called geared motor in which a motor body and a gear head are combined can be used.

  The “ridge side sprocket” and the “eave side sprocket” transmit the rotation of one of the ridge roller and the eave roller driven by a motor with a brake (hereinafter referred to as “driving roller”) to the chain, and This is a gear for transmitting the rotation of the chain to the other roller (hereinafter referred to as “driven roller”). For example, rivets can be used as means for attaching the chain to the inner surface of the seat.

  Therefore, according to the snow lowering apparatus of the present invention, since the sheet is stretched above the roof surface of the roof, snow accumulates on the sheet during snowfall. Therefore, when a certain amount of snow has accumulated on the seat, operating electric power is supplied to a motor with brake (hereinafter simply referred to as “motor”) to rotate the rotating shaft of the motor. In addition, supply and interruption | blocking of the electric power for operation | movement to a motor can be switched by manual operation of a switch. When the rotation shaft of the motor rotates, the rotation is transmitted to the ridge roller or the eaves roller. Here, at each end of the ridge roller and the eaves roller, a “ridge side sprocket” or “eave side sprocket” (hereinafter simply referred to as “sprocket”) is provided, and these sprockets are arranged on the inner surface of the seat. Is meshed with the chain. Thereby, rotational motion is transmitted to the chain (sheet) from the ridge side roller or the eaves side roller, and the sheet circulates along with this. When the upper sheet is moved in the direction from the ridge roller to the eaves roller by the rotation of the motor, the snow accumulated on the sheet is pushed out of the eaves roller and falls. In addition, although the speed | rate of the circumference | surroundings of a sheet | seat is not specifically limited, It is preferable to set it as the speed of 2m-4m / min so that the snow on a sheet | seat may be taken down gradually.

  At this time, since each sprocket is connected to the chain on the inner surface of the sheet, it is possible to reliably prevent slippage between the ridge roller and the eaves roller and the sheet and only the sheet from rotating.

  Further, when the operating power is not supplied to the motor, the rotation of the ridge roller or the eaves roller is regulated by the motor with brake. Thereby, it is possible to prevent only the sheet from moving around due to the weight of snow. Furthermore, even if a force from the ridge side to the eaves side is applied due to the weight of the snow while the motor is in operation, the speed of the circling of the seat is regulated by the motor so that the circling movement of the seat (snow Movement) is not accelerated. Therefore, in any case, it is possible to prevent a risk that snow that has accumulated on the seat falls under the eaves at a stretch, prevent damage to the house, and ensure the safety of the operator.

  Furthermore, the horizontal member erected on the ridge roller and the eaves roller is supported by the ridge column and eave column that are erected on the ground around the house. Therefore, the snow piled up on the sheet is transmitted to the ground via the ridge side support and the eaves support. The weight of snow is not directly applied to the house, and damage to the house can be prevented.

  Furthermore, in addition to the above configuration, the snow removal device of the present invention may include “a plurality of protrusions protruding from the outer surface of the sheet”.

  Here, the “projection” may be formed integrally with the sheet, or may be formed of another member and attached to the outer surface of the sheet using a fixing means such as a rivet. In this case, the protrusion may be formed of a material different from the sheet (for example, aluminum).

  Therefore, according to the snow lowering device of the present invention, the frictional force against the snow accumulated on the outer surface of the seat can be increased by the protrusion provided on the outer surface of the seat. Thereby, it is possible to prevent the accumulated snow from sliding off the outer surface of the seat. In addition, as the sheet moves around, the snow on the sheet can be reliably moved toward the eaves roller.

  Furthermore, in addition to the above-described configuration, the snow removal device of the present invention may be “the ridge roller and the eaves roller each have a concavo-convex surface formed in a circumferential wave shape”. I do not care.

  Here, “each corrugated circumferential surface” means a shape in which a large radius portion and a small radius portion are alternately and smoothly formed in a circular cross-section ridge roller and eave roller. It is what is shown.

  Therefore, according to the snow removal device of the present invention, the sheet inner surface of the sheet comes into contact with the uneven surface formed on the roller peripheral surfaces of the ridge roller and the eaves roller. Thereby, the friction between each roller and the sheet becomes large, and it becomes possible to suppress the occurrence of slip on the roller peripheral surface and the sheet inner surface. As a result, it is possible to suppress the bending and twisting of the entire sheet together with the suppression of the rotation of the sheet due to the engagement of the chain and the sprocket on the end side of the sheet, and to stabilize the rotation of the sheet.

  Therefore, with the snow lowering device of the present invention, unexpected movement of the seat during snow lowering work can be suppressed, and workability and safety can be improved.

It is a perspective view which shows the structure of the snow lowering apparatus which is one Embodiment of this invention. It is the longitudinal cross-sectional view which looked at the snow lowering apparatus of FIG. 1 from the front side. It is the expanded longitudinal cross-sectional view which looked at the snow lowering apparatus from the side surface side (eave side). It is an expansion perspective view which shows the structure of the sheet | seat and each roller in a snow lowering apparatus.

  Hereinafter, a snow lowering device 1 according to an embodiment of the present invention will be described with reference to FIGS. 1 to 4. Here, in FIG. 1, in order to clearly show each configuration, the sheet 28 is made transparent and shown by a two-dot chain line.

  As shown in FIGS. 1 and 2, the snow lowering device 1 of the present embodiment is installed on each roof surface 6 and is erected with the roof sandwiched between the ground around the house and both sides of the roof ridge. A pair of ridge-side columns 4a higher than the ridge and a column 4 including a pair of eaves-side columns 4b that are erected on both sides of the roof eaves from the ground around the house, Between the upper portions of the support columns 4 via brackets 11 (see FIG. 3), and arranged along the inclination of the roof 5 above the “keraku 7” corresponding to both ends of the roof 5. The ridge roller 17a is disposed above the ridge portion 8 of the four horizontal members 12 and the roof 5, and is rotatably supported between the pair of horizontal members 12 in parallel along the ridge portion 8. And a pair of horizontal members 12 arranged above the eaves portion 9 of the roof 5 and parallel to the eaves portion 9. An eaves roller 17b rotatably supported between the ridge roller 17a and the eaves roller 17b, and four intermediate rollers 17c rotatably supported by the pair of horizontal members 12; And an endless sheet 28 wound on the roof 5 and wound around the ridge roller 17a and the eaves roller 17b, and a brake motor 25 connected to one end of the eaves roller 17b. .

  Furthermore, the snow lowering device 1 is provided at each end of the ridge roller 17a, the eaves roller 17b, and the intermediate roller 17c (hereinafter simply referred to as “each roller 17” if it is not necessary to distinguish). In addition, the ridge side sprocket 21a, the eaves side sprocket 21b, and the intermediate sprocket 21c (hereinafter, collectively referred to as "each sprocket 21" if it is not necessary to distinguish) and the seat inner surface 29 of the seat 28 (see FIG. 4). A pair of endless chains 30 that are respectively mounted near the side sides of the seat and meshed with the sprockets 21 and a switch 35 that switches operation power supply to and interruption from the motor 25 with brake manually. Yes. Hereinafter, each configuration will be described in detail.

As shown in FIG. 1, the column 4 includes two ridge-side columns 4 a disposed on both sides of the ridge portion 8 with the roof 5 interposed therebetween, and two columns disposed on both sides of the eave portion 9 with the roof 5 interposed therebetween. The eaves side support | pillar 4b.
These struts 4 are all formed of a metal such as iron, have a square cylindrical shape, and are supported in a standing state by a concrete foundation (not shown) placed on the ground. Further, brackets 11 (see FIG. 3) are attached to the upper ends of the respective columns 4a and 4b by welding. Further, between the pair of eaves-side columns 4b, a reinforcing beam 10 that connects the upper portions of the eaves-side columns 4b is installed.

  As shown in FIGS. 1 and 3, the pair of horizontal members 12 are made of H-shaped steel, and each is bridged between one of the ridge-side column 4a and one of the eaves-side columns 4b. Not both ends are fastened to the bracket 11. Moreover, the horizontal member 12 is arrange | positioned along the inclination of the roof 5 by the height difference of the ridge side support | pillar 4a and the eaves side support | pillar 4b. Note that this inclination is set to have a predetermined inclination (for example, 12 degrees) at which the surface avalanche of snow hardly occurs regardless of the inclination angle of the roof 5.

  Each roller 17 is made of an aluminum extrusion mold, and its longitudinal direction substantially coincides with the length in the lateral direction (width direction) of the roof surface 6. Each roller 17 includes a shaft core 16 extending outward in the axial direction from the center of rotation. Further, as shown in FIG. 4, the outer circumferential surface of each roller 17 has an uneven surface 20 in which large radius portions and small radius portions are alternately and smoothly continuous along the circumferential direction. Is formed.

  A through-hole (not shown) penetrating in the axial direction is formed at the center of each sprocket 21, and the shaft core 16 extending from the roller 17 to the outside in the axial direction is inserted. The sprocket 21 is formed with a screw hole (not shown) formed in the radial direction from the outer peripheral surface toward the through hole. A male screw (not shown) is screwed into the screw hole, and the male screw By pressing the shaft core 16 fitted into the through hole at the tip of each, the rotation of each sprocket 21 relative to the shaft core 16 is prevented. In addition, the shaft core 16 which is inserted into the through hole of each sprocket 21 and extends further outward is provided via a fixture 14 provided along the longitudinal direction on the opposing inner surface of the pair of horizontal members 12. A bearing 15 (see FIG. 3) fixed to the horizontal member 12 is rotatably supported.

  The sheet 28 is made of a synthetic resin waterproof sheet, and is wound around the ridge roller 17a and the eaves roller 17b. Further, the size of the sheet 28 in the width direction is longer than the length of each roller 17 and covers each sprocket 21. The sheet 28 is endless by engaging a pair of sides of one sheet with teeth (not shown) of the fastener 33 (see FIG. 4). The fastener 33 slides a metal fitting (not shown) and meshes teeth with each other to make the sheet 28 endless. On the other hand, by sliding the metal fitting and separating the meshed teeth, the ridge portion It is possible to remove the sheet 28 from the roller 17a and the eaves roller 17b.

  Further, as shown in FIG. 4, the chain 30 includes a plurality of attachments 30 b having a flat plate shape and through holes 30 a, and the attachment 30 b is in contact with a seat inner surface 29 near the side of the seat 28. Attached to the seat 28. The seat 28 is provided with a first opening (not shown) at a position corresponding to the through hole 30a of the attachment 30b, and by fastening a rivet (not shown) through the first opening and the through hole 30a, A chain 30 is fixed to the seat 28. Further, the chain 30 is linearly arranged along the side of the seat 28, and the end of the chain 28 is made endless by the fastener 33, so that the end of the chain 30 is connected to each other. ing.

  A plurality of protrusions 32 are provided on the outer surface 31 of the sheet 28. The protrusion 32 is made of metal, and includes an attachment piece 32a that comes into surface contact with the outer surface 31 of the sheet 28, and a protrusion piece 32b that extends in a right-angle direction (outward direction) from one end of the attachment piece 32a. The cross section is substantially L-shaped. The attachment piece 32a is provided with a through hole 32c, and the seat 28 is provided with a second opening (not shown) at a position corresponding to the through hole 32c of the attachment piece 32a, through the second opening and the through hole 32c. The projection 32 is fixed to the sheet 28 by fastening a rivet (not shown). In the present embodiment, the protrusions 32 have a long strip shape having a length of about ３ in the width direction of the sheet 28, and the adjacent protrusions 32 are arranged alternately.

  As shown in FIG. 1, the brake motor 25 is attached to the eaves-side end of the horizontal member 12, and its axis 16 (not shown) extends from one end of the eaves roller 17b. Directly connected to The motor 25 with brake applies a rotational force to the eaves roller 17b via the shaft core 16 when the operating power is supplied, and the eave roller 17b via the shaft 16 when the operating power is not supplied. Stop rotation. Although not shown, the brake-equipped motor 25 attracts the movable iron core pressed by the spring when a voltage is applied to the coil, and a gap is generated between the movable iron core and the brake lining so that the rotating shaft can be rotated. . On the other hand, when the voltage to the coil is interrupted, the movable iron core is pressed against the brake lining by the spring, and the rotation of the eaves roller 17b is stopped by stopping the rotation of the motor shaft.

  The switch 35 is disposed in a lower part of the support column 4 (that is, a part that can be reached by the operator), and is interposed in an electric wire (not shown) that connects a commercial power source (not shown) and the motor 25 with brake. Supplying and shutting off operating power to the motor 25 with brake is switched by manual operation. Note that the switch 35 is provided corresponding to the snow lowering device 1 on each roof surface 6, and by operating the lever 35 a, the operating power is supplied to the motor 25 with brake in the corresponding snow lowering device 1. On the other hand, by releasing the lever 35a, the supply of operating power to the motor 25 with brake is stopped.

  Next, an example of how to use the snow lowering device 1 of this embodiment will be described. First, the seat 28 is mounted before entering the snowfall period. Specifically, one sheet is wound around the ridge roller 17a and the eaves roller 17b, and the fasteners 33 provided on one end side and the other end side of the sheet are closed. As a result, the endless sheet 28 is formed and is wound between the ridge roller 17a and the eaves roller 17b. At this time, the chain 30 provided on the sheet inner surface 29 of the sheet 28 is also endless, and can be engaged with the sprockets 21 disposed on both sides of the rollers 17.

  When snow is piled up on the seat 28 and the snow lowering operation is performed, the lever 35a of the switch 35 is pressed and operating power is supplied to the motor 25 with brake. Thereby, the rotating shaft of the motor 25 with a brake rotates, the rotational motion is transmitted to the eaves part roller 17b, and the eaves part roller 17b rotates. Here, since each sprocket 21 is provided at each end of each roller 17 and each of these sprockets 21 is meshed with a chain 30 attached to the sheet inner surface 29 of the sheet 28, A rotational motion is transmitted to the chain 30, and a rotational motion is transmitted from the chain 30 to the ridge roller 17a and the intermediate roller 17c.

  As a result, the endless sheet 28 wound around the ridge roller 17a and the eaves roller 17b is moved in the direction in which the upper surface moves from the ridge roller 17a side to the eaves roller 17b side. It moves around by rotating the motor so as to rotate. Accordingly, the snow accumulated on the sheet 28 is pushed from the eaves roller 17b side and falls while moving to the eaves roller 17b side together with the sheet 28.

  As described above, according to the snow lowering device 1 of the present embodiment, since the seat 28 is moved around by the driving force of the motor 25 with brake, even when there is a lot of snow accumulated on the seat 28, the snow can be easily lowered. Workability can be greatly improved.

  In addition, when the operating power is not supplied to the motor 25 with brake, the rotating shaft of the motor 25 with brake connected to the shaft core 16 of the eaves roller 17b rotates even if the eaves roller 17b tries to rotate. Therefore, it is possible to prevent the rollers 17 and the sheet 28 from starting to rotate and rotate due to the gravity of snow. Further, during the operation of the motor 25 with brake (that is, while the sheet 28 is moved in a circular motion), the force is applied so that the upper surface of the sheet 28 moves from the ridge roller 17a side to the eaves roller 17b side due to the gravity of snow. Even if it acts, since the moving speed of the seat 28 is regulated by the motor 25 with brake, it is possible to prevent the circumferential movement of the seat 28 from being accelerated. Therefore, the safety in the snow lowering work can be improved.

  Further, according to the snow lowering device 1 of the present embodiment, the chain 30 wound around the sprocket 21 of each roller 17 is fixed to the sheet 28 via the attachment 30b. It is possible to reliably prevent slippage between the two and only the seat 28 moving around. Accordingly, the operation of the motor 25 with brake can surely move the seat 28 around, and only the seat 28 circulates due to the gravity of snow while the motor 25 with brake is stopped (that is, during braking of the eaves roller 17b). It can prevent moving.

  Further, according to the snow lowering device 1 of the present embodiment, the horizontal member 12 that rotatably supports both ends of each roller 17 is supported by the plurality of support columns 4 that are erected on the ground around the house 2. Therefore, the gravity of the snow accumulated on the sheet 28 is applied to the ground via the plurality of support columns 4, and the collapse of the house 2 due to the gravity of the snow can be reliably prevented.

  Further, according to the snow lowering device 1 of the present embodiment, since the plurality of protrusions 32 are provided on the outer surface 31 of the sheet 28, the friction of the sheet 28 against the snow accumulated on the sheet 28 increases. Therefore, it is possible to prevent snow from sliding down on the sheet 28 and to move the snow on the sheet 28 to the eaves roller 17b side as the sheet 28 rotates.

  Further, according to the snow lowering device 1 of the present embodiment, since the corrugated uneven surface 20 is formed on the outer peripheral surface of each roller 17, the friction between each roller 17 and the sheet 28 is increased, and slip is suppressed. . For this reason, even if the size of the sheet 28 in the width direction is relatively large, the bending and twisting of the sheet 28 can be suppressed, and the sheet 28 can be smoothly moved around.

  The present invention has been described with reference to preferred embodiments. However, the present invention is not limited to these embodiments, and various modifications can be made without departing from the spirit of the present invention as described below. And design changes are possible.

  That is, in the above embodiment, the eaves roller 17b is driven by the motor 25 with brake, but the ridge roller 17a may be driven.

  Moreover, in the said embodiment, although the fixture 14 for attaching the some bearing 15 to the horizontal member 12 may be formed integrally as shown in figure, it is for the ridge part roller 17a and the intermediate | middle roller 17c. The mounting tool for mounting the bearing 15 and the mounting tool for mounting the bearing 15 for the eaves roller 17b are configured by separate members, and an adjustment mechanism capable of adjusting the interval between the mounting tools is provided. You may do it. According to this, when the sheet 28 is wound around the ridge roller 17a and the eaves roller 17b, it is possible to apply tension to the sheet 28 by widening the interval between the respective attachments, and the sheet 28 is removed. In this case, by narrowing the interval between the respective fixtures, the seat 28 can be bent in the circumferential direction, and the fastener 33 can be easily removed.

  Furthermore, in the above-described embodiment, the sheet 28 arranged for each roof surface 6 is individually moved around. However, for example, by operating one switch 35, each sheet 28 is moved around simultaneously. You may do it.

DESCRIPTION OF SYMBOLS 1 Snow lowering device 2 House 4 Prop 5 Roof 6 Roof surface 7 Scatter (both ends)
8 ridge portion 9 ridge portion 12 horizontal member 17a ridge portion roller 17b ridge portion roller 20 uneven surface 21a ridge side sprocket 21b ridge side sprocket 25 motor with brake 26 rotating shaft 28 seat 29 seat inner surface 30 chain 31 outer surface 32 protrusion

Utility model registration No. 3170658

Claims (3)

A pair of ridge-side columns that are erected on both sides of the roof ridge from the ground around the house, sandwiching the roof, and higher than the ridge,
A pair of eaves-side struts that are erected on both sides of the eaves of the roof from the ground around the house, and are higher than the eaves,
A pair of horizontal members each erected on one of the ridge side columns and one of the eaves columns;
A ridge roller disposed along the ridge of the roof and rotatably supported by the pair of horizontal members;
An eaves roller disposed along the eaves of the roof and rotatably supported by the pair of horizontal members;
An endless sheet wrapped around the roof surface of the roof, wound around the ridge roller and the eaves roller,
The ridge portion is connected to the ridge roller or the eaves roller and applies a rotational force to the ridge roller or the eaves roller when operating power is supplied, and the ridge portion when no operating power is supplied A motor with a brake that regulates rotation of the roller or the eaves part roller,
A pair of ridge-side sprockets provided at each end of the ridge roller;
A pair of eaves-side sprockets provided at each end of the eaves roller;
A snow lowering device comprising: a chain attached to an inner surface of the seat and meshing with the ridge side sprocket and the eave side sprocket.   The snow lowering device according to claim 1, further comprising a plurality of protrusions protruding from an outer surface of the sheet. The ridge roller and the eaves roller are
The snow lowering device according to claim 1 or 2, wherein each of the peripheral surfaces is an uneven surface formed in a wave shape in the circumferential direction.

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