Drum turntable

Abstract

To provide a drum rotary table having a simple structure and capable of rotating a drum while applying rotation resistance to the drum without operator's touching to the drum.SOLUTION: A drum rotary table 100 comprises: a shaft 2 disposed with orientation to extend in a vertical direction; a rotary table 3 fitted to the lower end of the shaft; a cradle 4 that rotatably supports the shaft 2; and a brake mechanism 5 for applying a braking force to the rotary table 3. The brake mechanism 5 has a braking force application mechanism part 25 which has a brake pad 27 pressed to a rotary table body plate 17, and a rod 26 rotatably fitted at a base end 55 to the braking force application mechanism part 25 and inclined in a direction away from the cradle 4 to press the brake pad 27 to the rotary table body plate 17.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a drum rotating table used when supplying rope to a winch or the like equipped on a work machine such as a crane. [Background technology]

[0002] Patent document 1 describes a device used to supply rope to winches equipped on work machines such as cranes, which includes a rotating table on which a wooden drum or the like around which the rope is wound is set, and a control drum to which a braking device is connected.

[0003] Although the above-described device can be used when supplying new rope to a winch or other equipment on a crane or other work machine, the simplest conventional method of supplying rope is to supply the rope directly to the winch from a drum on which the new rope is wound, as follows: A wooden drum (wooden barrel) on which the new rope is wound is set on a horizontal shaft supported from below by a platform. The end of the rope is then set on the winch equipped on the crane, and the winch is rotated to rotate the drum and wind the rope onto the winch. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 9-255287 Summary of the Invention [Problem to be solved by the invention]

[0005] The above-mentioned direct rope feeding method has the following problems. When the winch rotation is stopped, the drum's own weight and inertia force can cause the drum to over-rotate, causing the rope to become untidy inside the drum. To prevent the rope from becoming untidy inside the drum, the worker may feed the rope into the winch while applying direct rotational resistance to the drum with their hands or a wooden stick. This method, which requires the worker to come into contact with a rotating object, is not recommended.

[0006] An object of the present invention is to provide a drum turntable with a simple structure that allows an operator to rotate a drum while applying rotational resistance to the drum without touching the drum. [Means for solving the problem]

[0007] The drum rotating table disclosed in the present application is a drum rotating table that rotatably supports a drum around which a rope is wound, and includes a shaft into which the drum is inserted and that is oriented vertically, a rotating table having a rotating table main plate attached to the lower end of the shaft and on which the drum inserted into the shaft is placed, a base that is arranged below the rotating table and rotatably supports the shaft, and a brake mechanism that applies a braking force to the rotating table. The brake mechanism includes a braking force applying mechanism unit that has a brake pad that presses against the rotating table main plate, the braking force applying mechanism unit being attached to the base, and a rod that has a base end that is rotatably attached to the braking force applying mechanism unit and that can be tilted in a direction away from the base to press the brake pad against the rotating table main plate. [Effects of the Invention]

[0008] According to the present invention, it is possible to provide a drum turntable with a simple structure that allows an operator to rotate a drum while applying rotational resistance to the drum without touching the drum. [Brief explanation of the drawings]

[0009] [Figure 1]FIG. 2 is a plan view of a drum turntable according to an embodiment of the present invention. [Figure 2] FIG. 2 is a side view of the drum turntable shown in FIG. [Figure 3] 2 is a cross-sectional view taken along the line AA in FIG. 1. [Figure 4] 2 is a cross-sectional view taken along the line BB in FIG. 1, showing a braking state of the rotating table. FIG. [Figure 5] 2 is a perspective view of the brake mechanism portion shown in FIG. 1, showing the braking state of the rotating table. FIG. [Figure 6] FIG. 2 is a view corresponding to the cross-sectional view taken along the line BB in FIG. 1, showing a state in which the braking force is released. [Figure 7] 2 is a view equivalent to the perspective view of the brake mechanism portion shown in FIG. 1, showing a state in which the braking force is released. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0011] The drum rotating table 100 shown in Figures 1 to 7 is used to supply a rope (e.g., a wire rope) to a winch or the like equipped on a work machine such as a crane. As shown in the overall view in Figures 1 and 2, the drum rotating table 100 rotatably supports a drum 1.

[0012] The drum 1 is, for example, a wooden drum called a kibaru. Although not shown in FIG. 2, a rope is wound around the body 6 of the drum 1. The drum 1 may be made of metal instead of wood.

[0013] The drum turntable 100 comprises a shaft 2 into which the drum 1 is inserted, a turntable 3 attached to the lower end of the shaft 2, a base 4 arranged below the turntable 3, and a brake mechanism 5 that applies a braking force to the turntable 3.

[0014] The shaft 2 is disposed so as to extend vertically. As shown in FIG. 3 , the shaft 2 of this embodiment has a solid first shaft portion 8 constituting the lower end portion and a cylindrical second shaft portion 9 inserted from above into the upper end of the first shaft portion 8. The length of the second shaft portion 9 is longer than the length of the first shaft portion 8. The first shaft portion 8 has a first small diameter portion 8a, a large diameter portion 8b, a second small diameter portion 8c, and a third small diameter portion 8d, in this order. The diameter of the second small diameter portion 8c is slightly larger than the diameter of the third small diameter portion 8d. The end face of the second shaft portion 9 abuts against a step portion 10 formed at the boundary between the second small diameter portion 8c and the third small diameter portion 8d, thereby receiving and supporting the second shaft portion 9 on the first shaft portion 8. The upper end of the second shaft portion 9 is closed by a plate member 11. The second shaft portion 9 may be fixed to the first shaft portion 8 by welding or the like, but in this embodiment, the second shaft portion 9 is not fixed to the first shaft portion 8.

[0015] The diameters of the second shaft portion 9 and the second small diameter portion 8c of the first shaft portion 8 are slightly smaller than the diameter of the shaft hole 1a of the drum 1 (see FIG. 1).

[0016] The turntable 3 is composed of a circular turntable main plate 17 and a plurality of elongated mounting tables 12. The mounting tables 12 are, for example, channel steel (section steel) with a U-shaped cross section. The plurality of mounting tables 12 are fixed to the upper surface of the turntable main plate 17 by welding or the like. The plurality of mounting tables 12 are arranged radially on the upper surface of the turntable main plate 17. The number of mounting tables 12 is not particularly limited, but in this embodiment, a total of five mounting tables 12a to 12e are used. Of the mounting tables 12a to 12e, mounting tables 12d and 12e are used as one set of mounting tables. Mounting tables 12d and 12e are arranged parallel to each other at a predetermined interval. Mounting tables 12a, 12b, 12c, and 12d-12e are arranged at 90-degree intervals around the central axis of the turntable main plate 17.

[0017] After being inserted into the shaft 2, the drum 1 is placed on the turntable main plate 17 with a plurality of mounting tables 12 sandwiched between them. The mounting tables 12 create a gap below the drum 1. The mounting tables 12 may be omitted. In this case, the drum 1 is placed directly on the turntable main plate 17.

[0018] The turntable main body plate 17 has a guide hole 17a extending in its radial direction. The guide hole 17a is an elongated hole. The mounting tables 12d and 12e are arranged on either side of the guide hole 17a, sandwiching the guide hole 17a therebetween. A pin member 13 is inserted into and fixed in the guide hole 17a. As shown in FIG. 3, the pin member 13 is composed of a bolt 14 as a main body, a tubular member 15 as a reinforcing member and spacer member, and a nut 16. The outer diameters of the head 14a of the bolt 14 and the tubular member 15 are larger than the width of the guide hole 17a. The shaft 14b of the bolt 14 is inserted into the guide hole 17a and the tubular member 15. A nut 16 is threadedly engaged with and tightened onto the tip end of the shaft 14b of the bolt 14, with the tubular member 15 sandwiched between the turntable main body plate 17 and the bolt 14.

[0019] By loosening the nut 16, the pin member 13 can move along the guide hole 17a in the radial direction of the turntable main plate 17. As shown in FIG. 2, a hole 7a is formed in the flange portion 7 of the drum 1, in other words, in the side surface of the drum 1. The pin member 13 (the tip of the shaft portion 14b of the bolt 14) is inserted into the hole 7a in the drum 1. Drums 1 come in various sizes, and the position of the hole 7a may vary depending on the drum 1. Because the pin member 13 can move along the guide hole 17a in the radial direction of the turntable main plate 17, an operator can easily adjust the position of the pin member 13 so that the pin member 13 fits into the hole 7a. By inserting the pin member 13 into the hole 7a, the turntable 3 rotates integrally with the drum 1.

[0020] As shown in Figure 3, a hole 17b is provided in the center of the turntable main body plate 17. The first shaft portion 8 of the shaft 2 is inserted into this hole 17b. The turntable main body plate 17 is fixed to the first shaft portion 8 by a connecting plate 18. The first shaft portion 8 and the connecting plate 18 are fixed by, for example, welding. The connecting plate 18 and the turntable main body plate 17 are fixed by, for example, bolts 19. Note that the turntable main body plate 17 does not necessarily have to be fixed to the connecting plate 18.

[0021] The gantry 4 rotatably supports the first shaft portion 8 of the shaft 2 to which the rotating table 3 is attached. The gantry 4 is composed of a substantially rectangular gantry main body plate 20, a bearing 21, and multiple leg members 22. As shown in FIG. 3 , the gantry main body plate 20 has a hole 20a into which a portion of the first shaft portion 8 is inserted. A bearing 21 that rotatably supports the first small diameter portion 8a of the first shaft portion 8 is attached via a plate 23 to the top of the gantry main body plate 20 at the portion where the hole 20a is provided. The bearing 21 is a thrust bearing. The gantry main body plate 20 and the plate 23 are fixed together by, for example, bolts 24. The multiple leg members 22 are attached to the underside of the gantry main body plate 20. In this embodiment, four leg members 22 are attached to each corner of the underside of the gantry main body plate 20.

[0022] The brake mechanism 5 that applies a braking force to the rotating table 3 has a braking force applying mechanism part 25 attached to the base 4 and a rod 26.

[0023] The braking force applying mechanism 25 is made up of a brake pad 27, a pad support bracket 28, a second brake pad 29, a second pad support bracket 30, a bracket biasing mechanism 31, and the like.

[0024] The brake pads 27 are pressed against the turntable main body plate 17. The brake pads 27 are pressed against the underside of the turntable main body plate 17 from below the turntable main body plate 17. The brake pads 27 are attached to a pad support bracket 28. The brake pads 27 are attached to the upper surface of the tip side of the pad support bracket 28. The brake pads 27 and the pad support bracket 28 are fixed together by, for example, bolts 32. The pad support bracket 28 in this embodiment is a plate having bent portions 28a at both ends in the width direction. The presence of the bent portions 28a increases the rigidity of the pad support bracket 28.

[0025] The second brake pad 29 is disposed above the brake pad 27 with the turntable main body plate 17 sandwiched between the brake pad 27 and the second brake pad 29. The second brake pad 29 is pressed against the turntable main body plate 17. The second brake pad 29 is attached to the second pad support bracket 30. The second brake pad 29 is attached to the underside of the tip side of the second pad support bracket 30. The second brake pad 29 and the second pad support bracket 30 are fixed together by, for example, bolts 39. The second pad support bracket 30 of this embodiment is a plate having bent portions 30a at both ends in the width direction. The bent portions 30a increase the rigidity of the second pad support bracket 30. The second pad support bracket 30 is disposed above the pad support bracket 28.

[0026] A bracket support member 33 is provided on the upper surface of the gantry main body plate 20. The bracket support member 33 is composed of a lower plate 34 and a gate-shaped upper plate 35 (see FIG. 5). The lower plate 34 and the upper plate 35 are fixed together by welding, for example. The lower plate 34 and the gantry main body plate 20 are fixed together by bolts 36, for example, as shown in FIG. 5.

[0027] A bolt 37 serving as a support member is provided on the bracket support member 33 so as to penetrate through the top panel portion of the upper plate 35 and the lower plate 34. As shown in FIG. 4, the bolt 37 is fastened and fixed to the bracket support member 33 with a nut 38. In this embodiment, two bolts 37 (support members) are provided at a predetermined interval. This configuration stabilizes the pressing action of the brake pad 27 and the second brake pad 29 against the turntable main body plate 17 compared to when only one bolt 37 is provided. Note that the number of bolts 37 may be one, or three or more. As shown in FIG. 4, a hole 20b is provided in the gantry main body plate 20. A nut 38 for fixing the bolt 37 is placed in this hole 20b.

[0028] As shown in Fig. 4, a tubular member 40 is fixed to the middle portion of the pad support bracket 28. The tubular member 40 is inserted into the bolt 37 so as to be movable in the vertical direction. In addition, a second tubular member 41 is fixed to the rear end portion of the second pad support bracket 30. The second tubular member 41 is inserted into the bolt 37 so as to be movable in the vertical direction.

[0029] In addition, a spring 42 is disposed between the second pad support bracket 30 and the pad support bracket 28. The spring 42 biases the second pad support bracket 30 and the pad support bracket 28 in directions that move them apart. The spring 42 is, for example, a coil spring. The spring 42 is inserted into the bolt 37.

[0030] The bracket biasing mechanism 31 is for pressing the brake pad 27 against the turntable main body plate 17 via the pad support bracket 28 .

[0031] The bracket biasing mechanism 31 is composed of a biased portion 43 provided on the surface of the pad support bracket 28 opposite the brake pad 27, and a power transmission member 44 having a tapered tip.

[0032] The biased portion 43 has an inclined surface 43a that is inclined obliquely with respect to the pad support bracket 28. The biased portion 43 is, for example, a plate member bent into an L shape. The pad support bracket 28 and the biased portion 43 are fixed together by, for example, welding. The tip of the power transmission member 44 abuts against the inclined surface 43a.

[0033] The power transmission member 44 of this embodiment is formed by combining multiple plates. As shown in FIG. 5 , the power transmission member 44 has a pair of main plate members 45, 46 each having a tapered tip. The main plate members 45, 46 have the same shape and dimensions. The main plate members 45, 46 are disposed with a gap between them. The main plate members 45, 46 are connected at their tip ends by a pair of abutting plate members 47. The abutting plate members 47 are fixed to the tip ends of the main plate members 45, 46 by welding or the like. The upper abutting plate member 47 of the pair of abutting plate members 47 abuts against the inclined surface 43a of the biased portion 43.

[0034] Guide holes 45a, 46a extending in the longitudinal direction of the main body plate members 45, 46 are provided at the rear ends of the main body plate members 45, 46. The guide holes 45a, 46a are elongated holes. Pin members 48 are inserted into the guide holes 45a, 46a. A pair of support plates 49 are erected at a predetermined interval on the upper surface of the gantry main body plate 20. The pin members 48 are inserted into holes provided in these support plates 49 and are prevented from coming off by a retaining pin 50. In addition, a pin member 51 is attached to a hole formed in the center of the main body plate members 45, 46.

[0035] The bracket biasing mechanism 31 of this embodiment has a biasing auxiliary bracket 52. The biasing auxiliary bracket 52 is arranged below the pad support bracket 28. The biasing auxiliary bracket 52 is a plate having bent portions 52a at both ends in the width direction. The bent portions 52a increase the rigidity of the biasing auxiliary bracket 52. The biasing auxiliary bracket 52 and the second pad support bracket 30 are connected by a connecting plate 61. The bent portion 52a of the biasing auxiliary bracket 52 and the bent portion 30a of the second pad support bracket 30 are connected by the connecting plate 61. In this embodiment, two connecting plates 61 are used. A tubular member 53 is fixed to the biasing auxiliary bracket 52. The tubular member 53 is inserted into the tubular member 40 fixed to the pad support bracket 28 from the outside of the tubular member 40. A biased auxiliary portion 54 is provided on the upper surface of the biasing auxiliary bracket 52. The biased assisted portion 54 has an inclined surface 54a that is inclined obliquely relative to the biasing assist bracket 52. The biased assisted portion 54 is, for example, a member formed by bending a plate member into an L shape. The biasing assist bracket 52 and the biased assisted portion 54 are fixed together by, for example, welding. The tip end of the power transmission member 44 (the lower abutment plate member 47 of the pair of abutment plate members 47) is butted against the inclined surface 54a.

[0036] The rod 26 is composed of a base end portion 55 that is rotatably attached to the power transmission member 44 and a rod main body portion 56 that extends from the base end portion 55.

[0037] The base end portion 55 is a U-shaped member in a side view. As shown in FIG. 4, an action hole 55a extending in the longitudinal direction of the base end portion 55 is provided at the tip of the base end portion 55. The action hole 55a is an elongated hole. A pin member 51 is inserted into the action hole 55a. The pin member 51 interconnects the base end portion 55 of the rod 26 and the power transmission member 44. The base end portion 55 of the rod 26 is rotatably attached to the power transmission member 44.

[0038] A pin member 57 is inserted into a hole 55b formed in the center of the base end portion 55. The pin members 57 are inserted into and fixed in respective holes formed in a pair of support plates 49. The rod 26 is supported by the pair of support plates 49 via the pin members 57. The rod 26 rotates around the center of the hole 55b. As shown in FIG. 4, a hole 20c is formed in the gantry main body plate 20. A part of the base end portion 55 fits into this hole 20c.

[0039] A plurality of weight plates 58 are attached to the rod main body 56 as weights. The weight plates 58 have attachment holes 58a that are inserted into the rod main body 56 (see FIG. 2). The weight plates 58 are attached to the rod 26 on the side opposite the braking force applying mechanism 25 from the rotation center of the rod 26. As shown in FIG. 2, a ring plate 59 is fixed to the rod main body 56. The ring plate 59 supports the weight plates 58 so that they do not slip off.

[0040] As shown in Figures 6 and 7, the brake mechanism 5 includes a release pin member 60 for maintaining a state in which the braking force acting on the rotating table 3 is released. The release pin member 60 restricts tilting movement of the rod 26. The release pin member 60 is inserted into a hole provided in the support plate 49 so as to abut against the side surface of the base end 55 of the rod 26. The position of the release pin member 60 is determined by design so that, when the release pin member 60 abuts against the side surface of the base end 55 of the rod 26, a gap is formed between the inclined surface 43a of the biased portion 43 and the tip end of the power transmission member 44, and a gap is also formed between the inclined surface 54a of the assisted biased portion 54 and the tip end of the power transmission member 44.

[0041] The drum carousel 100 operates as follows.

[0042] As a premise, it is assumed that the drum 1 around which the rope is wound is set on the drum rotating table 100 as shown in Figure 2. Also, it is assumed that the end of the rope wound around the drum 1 is set on a winch equipped to a crane. It is also assumed that the release pin member 60 is removed from the support plate 49.

[0043] The weight of the weight plate 58 attached to the tip of the rod 26 causes the rod 26 to rotate and tilt in a direction away from the platform 4. As a result, the base end 55 of the rod 26 presses the power transmission member 44 via the pin member 51. As a result, the tip of the power transmission member 44 (the abutment plate member 47) presses the inclined surface 43a of the biased portion 43 and the inclined surface 54a of the biased auxiliary portion 54. As the biased portion 43 is pressed, the pad support bracket 28 rises against the biasing force of the spring 42. As the pad support bracket 28 rises, the brake pad 27 is pressed against the turntable main body plate 17. As the biased auxiliary portion 54 is pressed, the bias auxiliary bracket 52 descends, and in conjunction with this, the second pad support bracket 30 also descends. As the second pad support bracket 30 descends, the second brake pad 29 is pressed against the turntable main body plate 17. These components create a rotational resistance on the rotating table main plate 17. As a result of the rotational resistance being created on the rotating table main plate 17, a rotational resistance is also created on the drum 1. When the rotation of the winch equipped on the crane is stopped, the drum 1 is in a state where a rotational resistance is being created, so over-rotation of the drum 1 is suppressed. As a result, it is possible to prevent the rope from becoming tangled inside the drum 1. When the winch is rotated, the drum 1 rotates with a rotational resistance acting on it.

[0044] The braking force can be changed by changing the number of weight plates 58. If it is desired to increase the braking force (braking force, rotational resistance) depending on the weight of the drum 1 and the weight of the rope being used, the number of weight plates 58 is increased. On the other hand, if it is desired to decrease the braking force (braking force, rotational resistance), the number of weight plates 58 is decreased.

[0045] When it is desired to release the brake, the release pin member 60 is used to restrict the tilting movement of the rod 26 so that a gap is formed between the inclined surface 43a of the biased portion 43 and the inclined surface 54a of the biased assisted portion 54 and the tip of the power transmission member 44, as shown in Figures 6 and 7. This makes it possible to maintain the released state of the brake.

[0046] If an operator wishes to control the braking force (braking force, rotational resistance), the braking force (braking force, rotational resistance) can be changed by manually rotating rod 26. In this case, weight plates 58 may remain attached, or all weight plates 58 may be removed from rod 26.

[0047] (effect) The drum turntable 100 allows the worker to rotate the drum 1 while applying rotational resistance to the drum 1 without touching the drum 1. Furthermore, the worker can work safely because he or she does not need to be positioned in close proximity to the drum 1. The drum turntable 100 has a simple structure, equipped with a braking force applying mechanism 25 having brake pads 27 that are pressed against the turntable main body plate 17, and a rod 26 that can be tilted in a direction away from the base 4.

[0048] The drum rotating table 100 includes a weight attached to the rod 26 on the side opposite the braking force applying mechanism 25 from the rotation center of the rod 26. With this configuration, a braking force can be applied to the rotating table 3 without manually rotating the rod 26. Note that a braking force may also be applied to the rotating table 3 by an operator manually rotating the rod 26 without using a weight.

[0049] In this embodiment, the weight is a plurality of weight plates 58 having mounting holes 58a into which the rods 26 are inserted. With this configuration, the braking force can be easily changed by changing the number of weight plates 58.

[0050] The braking force applying mechanism 25 has a pad support bracket 28 to which the brake pads 27 are attached, and a bracket biasing mechanism 31 that presses the brake pads 27 against the turntable main body plate 17 via the pad support bracket 28. This configuration makes it possible to apply a braking force to the turntable 3 with a simple structure.

[0051] The bracket biasing mechanism 31 includes a biased portion 43 provided on the surface of the pad support bracket 28 opposite the brake pad 27, the biased portion 43 having an inclined surface 43a that is obliquely inclined relative to the pad support bracket 28, and a power transmission member 44 having a tapered tip that abuts against the inclined surface 43a, the power transmission member 44 having a base end 55 of the rod 26 rotatably attached thereto. When the rod 26 is tilted in a direction away from the base 4, the power transmission member 44 presses the brake pad 27 against the turntable main body plate 17 via the biased portion 43 and the pad support bracket 28. This configuration makes it possible to apply a braking force to the turntable 3 with a simple structure.

[0052] The braking force applying mechanism 25 further includes a second brake pad 29 that is pressed against the turntable main body plate 17 and is arranged above the brake pad 27 so as to sandwich the turntable main body plate 17 between the brake pad 27 and the second brake pad 29, and a second pad support bracket 30 to which the second brake pad 29 is attached and is arranged above the pad support bracket 28.

[0053] According to this configuration, braking force can be applied to the turntable 3 by sandwiching the turntable main body plate 17 between the brake pad 27 and the second brake pad 29, so braking force can be applied more reliably to the turntable 3. Furthermore, because the turntable main body plate 17 is pressed down from above by the second brake pad 29, it is possible to prevent unnecessary bending moment from acting on the lower end of the shaft 2 via the turntable 3 having the turntable main body plate 17.

[0054] The braking force applying mechanism 25 is disposed between the second pad support bracket 30 and the pad support bracket 28, and further includes a spring 42 that biases the second pad support bracket 30 and the pad support bracket 28 in directions that move the second pad support bracket 30 and the pad support bracket 28 apart. With this configuration, when the brake is released, the elastic force of the spring 42 can move the brake pad 27 and the second brake pad 29 away from the turntable main body plate 17. As a result, the brake can be released more reliably, and wear on the brake pad 27 and the second brake pad 29 can be reduced.

[0055] The brake mechanism 5 further includes a release pin member 60 for maintaining a released state of the braking force acting on the rotating table 3, and for restricting tilting movement of the rod 26. With this configuration, the brake can be maintained in a released state.

[0056] The present invention is not limited to the above-described embodiments, and it is possible to appropriately combine the configurations of the above-described embodiments and to make various modifications to the above-described embodiments.

[0057] The above embodiment can be modified, for example, as follows.

[0058] The configurations such as the second brake pad 29 and the second pad support bracket 30 that apply a braking force by pressing down on the turntable main body plate 17 from above may be omitted.

[0059] The spring 42 may be omitted, and the release pin member 60 may also be omitted. [Explanation of symbols]

[0060] 1: Drums 2: Shaft 3: Rotating table 4: Stand 5: Brake mechanism 17: Rotating table main plate 25: Braking force applying mechanism 26: Rod 27: Brake pads 28: Pad support bracket 29: Second brake pad 30: Second pad support bracket 31: Bracket biasing mechanism 42: Spring 43: Forced part 43a: Inclined surface 44: Power transmission components 55: Proximal end 58: Weight plate (weight) 58a: Mounting hole 60: Release pin member 100: Drum turntable

Claims

1. A drum turntable that rotatably supports a drum around which a rope is wound, a shaft into which the drum is inserted, the shaft being oriented to extend in a vertical direction; a turntable having a turntable body plate attached to a lower end of the shaft and on which the drum inserted into the shaft is placed; a base disposed below the rotating table and rotatably supporting the shaft; a brake mechanism that applies a braking force to the rotary table; Equipped with The brake mechanism includes: a braking force applying mechanism having a brake pad pressed against the rotating table main body plate, the braking force applying mechanism being attached to the base; a rod having a base end rotatably attached to the braking force applying mechanism and tilted in a direction away from the base to press the brake pad against the rotating table main body plate; a drum turntable having

2. 2. The drum turntable of claim 1, The drum rotating table further includes a weight attached to the rod on the opposite side of the rotation center of the rod from the braking force applying mechanism.

3. 3. The drum turntable of claim 2, The drum turntable, wherein the weights are a plurality of weight plates having mounting holes that are inserted onto the rods.

4. 4. The drum turntable according to claim 1, The braking force applying mechanism includes: a pad support bracket to which the brake pad is attached; a bracket biasing mechanism that presses the brake pad against the turntable body plate via the pad support bracket; a drum turntable having

5. 5. The drum turntable of claim 4, The bracket biasing mechanism includes: a biased portion provided on a surface of the pad support bracket opposite to the brake pad, the biased portion having an inclined surface that is obliquely inclined with respect to the pad support bracket; a power transmission member having a tapered tip end that abuts against the inclined surface, the power transmission member to which the base end of the rod is rotatably attached; and When the rod is tilted in a direction away from the base, the power transmission member presses the brake pad against the turntable main body plate via the biased portion and the pad support bracket.

6. 6. The drum turntable according to claim 4 or 5, The braking force applying mechanism includes: a second brake pad pressed against the turntable body plate, the second brake pad being disposed above the brake pad so as to sandwich the turntable body plate between the second brake pad and the brake pad; a second pad support bracket to which the second brake pad is attached, the second pad support bracket being disposed above the pad support bracket; a drum turntable further comprising:

7. 7. The drum turntable of claim 6, The braking force applying mechanism includes: The drum turntable further includes a spring disposed between the second pad support bracket and the pad support bracket, the spring biasing the second pad support bracket and the pad support bracket in directions away from each other.

8. 8. The drum carousel according to claim 1, The brake mechanism includes: The drum turntable further includes a release pin member for maintaining a released state of the braking force acting on the turntable, the release pin member restricting tilting movement of the rod.

Images