JPH0351413A - Brake device of lifter - Google Patents

Abstract

PURPOSE:To compact the structure of the brake device so as to simplify processing and assembling of the device by arranging the input shaft and output shaft of a self-weight falling type lifter on one center axis, and providing a mechanical brake and an increased fastening force retaining brake on the same axis. CONSTITUTION:When a handle 1 is turned in the opening direction 11, an output shaft 4 receives torque in the gravitational direction 46 and an input shaft 2 and the output shaft 4 are integrated with each other, and the torque of the handle 1 is transmitted to the output shaft, so that a water-gate door is raised. Under these conditions, when the handle 1 is stopped and left, rotation in the gravitational direction 46 is stopped by a ratchet plate 36 and a claw 49, so that the water-gate door is kept open. Then, when the handle 1 is rotated in the closing direction 12, the output shaft 4 follows rotation of the input shaft 2 and so the water gate is lowered. After the water gate reaches the bottom, the handle 1 is further rotated in the closing direction 12, and then the water gate compresses a watertight rubber and increases fastening forces. Thereby the device is miniaturized.

Description

[Detailed description of the invention]

[Industrial Field of Application] The present invention relates to a brake device for a lifting device such as a water gate opening/closing device that raises and lowers a load and presses the load against a floor surface. [Prior Art] Conventionally, in this type of device, for example, in a manual water gate opening/closing device, the water gate was closed using a mechanical brake or a centrifugal brake. After the sluice gate reaches the bottom of the water, use the handle to further push the sluice gate down to prevent water leakage, and tighten the watertight rubber provided on the lower edge of the sluice gate.

[Yes, it was necessary to maintain the retightened condition.] For this purpose, a mechanism as shown in, for example, Japanese Patent Laid-Open No. 62-35159 has been proposed. [Problem to be solved by the invention] However, in such conventional devices, the input shaft and the output shaft are arranged in parallel, and torque is transmitted between the two shafts using an external gear. There are problems such as the space required, the device being large, and the processing and assembly of the gearbox being complicated. The present invention solves the problems of these conventional devices and provides a brake device for a lifting device that has a mechanical brake action when a load is lowered and a pressing force holding brake action that holds the load pressed against the floor surface. , the device becomes smaller,
The object of the present invention is to provide a gearbox that is easy to process and assemble. [Means for Solving the Problems] The present invention is directed to a rotational driving force transmission mechanism of a self-weight lowering lifting device that lifts and lowers a load using the rotational driving force manually or by a prime mover and gravity. In the brake device, an input shaft and an output shaft are arranged with their respective shaft ends facing each other on a center axis, and the input shaft and the output shaft each include: (A) a threaded portion at a leg end; (B) a tension bar at the end of the shaft end of the threaded part; (C) a friction plate fixed to the input shaft or the output shaft; and (D) a sliding/notch screwed into the threaded part. 1. and (E) the nut and the friction plate are rotatably supported in one direction with respect to the input shaft or the output shaft, and the nut and the friction plate are engaged by frictional action. and a reversal prevention mechanism that separates, wherein the input shaft nano and the output shaft nut are engaged via a sliding shaft joint that does not restrain each other in the axial direction but restrains each other in the rotational direction. , the threaded portion of the input shaft and the unscrewed portion of the output shaft have screws twisted in opposite directions, and the reverse rotation prevention mechanism of the input shaft and the reverse rotation prevention mechanism of the output shaft are mutually compatible. This is a brake device for an elevating device, characterized in that the permissible rotation direction is opposite to the braking device of the elevating device. [Function] By having the structure as described above, the present invention includes a mechanical brake for lowering the load on one of the output shaft and the input shaft, and a pusher holding brake on the other shaft. Therefore, it is possible to maintain the pressed state, and the mechanical brake action part also acts as a pressing force holding brake (in the case of a water gate opening/closing device, an additional tightening force holding brake) to keep the load pressed against the floor surface. The input and output shafts are arranged very compactly on the same axis, and the space perpendicular to the shaft is small, and the input and output shafts are not separate, parallel axes, making it easy to use gearboxes. The number of shaft holes is also eliminated, making machining and assembly easier. (Example of ability) An embodiment of the present invention will be explained using the drawings. Fig. 2 shows an example of the arrangement of the brake device of the present invention. Fig. 4 shows the gear device from the handle of a manual water gate opening/closing device. 1 is a manual handle, 2 is an input shaft, 3 is a brake device according to the present invention, 4 is an output shaft, 5 is a multi-plate clutch, and 6 is a pinion. The shaft, 7 is the centrifugal brake, 8 is the pinion, 9 is the gear that meshes with it, 10 is the binion, and the subsequent gear mechanism,
Binions and rack mechanisms that raise and lower the water gate are omitted. As described below, if you connect the multi-plate clutch 6 and turn the handle 1 in the opening direction 11, the water gate will open (sluice gate rising), and if you turn it in the closing direction ■2, the water gate will close (sluice gate descending). It has become. When the multi-plate clutch 5 is shut off, the sluice gate descends under its own weight at a predetermined speed by the action of the centrifugal brake 7. The details of the brake device 3 will be explained with reference to FIG. The input shaft 2 is rotatably but fixedly supported in the axial direction by a bearing 16 on a flange metal 15 attached to a gear box 13 of the lifting device via a casing 14 of the brake device 3. The output shaft 4 is rotatably and fixedly supported in the axial direction by a rolling bearing 18 provided in the casing 14 and a rolling bearing (not shown) provided in the multi-plate clutch 5. . The input shaft 2 and the output shaft 4 are arranged facing each other on one central shaft 19, and a guide hole 20 provided at the shaft end of the input shaft 2 is provided at the shaft end of the output shaft 4. The guide pin 2l is fitted so that it can rotate relative to each other to prevent the centers of both shafts from shifting. A friction plate 24.25 having a friction surface 22.23 on the side facing the shaft end is fixed to each of the input shaft 2 and the output shaft 4. A screw 26 (left-hand thread) is provided at the axis y:;: of the input shaft 2, and a screw 27 (right-hand thread) is provided at the end of the output shaft 4 as a thread. 1・
28 and 29 are screwed together. Both nazos 28 and 29 are connected by a sliding shaft joint using a doubling pin 32 so that they are mutually restrained in the rotational direction to transmit torque, and can be slid relative to each other without being mutually restrained in the axial direction. engaged. The surfaces of both nuts 2829 facing the friction plates 24 and 25 are friction surfaces 3
It is 031. Between the nut 28 and the friction plate 24, a ratchet plate 33 serving as a reverse rotation prevention mechanism is rotatably supported around the input shaft 2. Brake linings 3435 are provided on both axial end surfaces of the ratcheso 1 and the plate 33. On the other hand, between the ratchet plate 29 and the friction plate 25, a ratchet plate 36 serving as a reverse rotation prevention mechanism is rotatably supported around the output shaft 4. Brake linings 37, 38 are provided on both sides of the ratchet plate 36. Therefore, the ratchet plate 33 is oriented in the closed direction 12 as described later.
rotation in the opening direction 11 is permitted, and rotation in the opening direction 11 is prevented and acts as a part of the additional brake. On the other hand, as will be described later, the ratchet plate 36 is allowed to rotate in the opening direction 11, but is prevented from rotating in the closing direction 12, and acts as a part of the mechanical brake. That is, ratchet plate 3
The permissible rotational directions of the ratchet plate 3 and the ratchet plate 36 are opposite to each other. To explain about the ratchet board 33, the ratchet board 33
The ratchet plate 33 is made of
Rotation in the closing direction 12 is allowed, but rotation in the opening direction 11 is prohibited. Contrary to this, for the other ratchet opening plates 36, rotation in the opening direction 11 is allowed, but rotation in the closing direction 12 is prevented by the ratchet opening claws 49 urged by the springs 48. It has become. Since the screw 26 is a left-handed screw and the screw 27 is a right-handed screw, the following functions are achieved. i.e. load (sluice gate)
The direction of the torque caused by its own weight is the gravitational action direction 46
Then, when the output shaft 4 is rotated in the direction of gravity action 46 relative to the input shaft 2 by the torque in the direction of gravity action 46, the screw 27 (right-hand thread) causes the nasoto 29 to move in the direction of gravity action 46. When approaching the ratchet plate 36, which is a reversal prevention mechanism that does not allow rotation in the action direction 46, the friction surface 3 is pressed against the brake lining 37, so that 1 to 1 torque in the gravity action direction 46 is transmitted to the ratchet plate 36. Become. However, rotation in this direction is prevented by the action of the radieno 1 plate 36 described above. Conversely, if the output shaft 4 is rotated in the anti-gravity direction 47 relative to the input shaft 2, the screw 27 (right-hand thread) moves the nasoto 29 to the left and hits the stopper 40, causing the rotor to close. At the same time, the nut 28 moves to the left due to the action of the screw 26 (left-hand thread), and the nut 28 moves toward the anti-gravity action direction 47.
Radienote plate 3 is a reversal prevention mechanism that does not allow rotation of
3 and is crimped against it, thereby transmitting torque in the anti-gravity direction 47. However, the above-mentioned ratchet plate 33
Rotation in this direction is prevented by the action of . The operation of the brake device constructed as above will be explained. First, we will explain the operation of opening and closing the water gate (lifting and lowering the water gate) by turning the handle 1 in the opening direction 11 and starting from the state where the water gate begins to rise. Since the torque is applied in the direction of gravity 46 relative to
The nasoto 29 is in contact with the output shaft 4 with the lacente plate 36 in between.
The torque from its own weight acts on the nut 1-28 via the doubling pin 32. Here, since the input shaft 2 is rotated in the opening direction 11 by the handle 1, due to the action of the screw 26, which is a left-hand thread,
The nut 28, which is receiving the torque of its own weight, shifts to the right side, contacts the stopper 39, and is rotated, the input shaft 2 becomes integrated with the output shaft 4, the torque of the handle 1 is transmitted to the output shaft 4, and the water gate door is opened. Rise. At this time, the ratchet plate 33 has no frictional force and is in a free state, and the ratchet plate 36 is not restrained by the ratchet latch 49 and is in a free state, so it does not prevent the handle 1 from rotating in the opening direction 11. If you stop the handle 1 and release your hand in this state, the 1.1 torque from the input shaft 2 will disappear, but the naso 1.29 will be removed from the friction plate 25.
Since the ratchet plate 36 is pressed against the output shaft 4, the rotation plate 29, and the ratchet plate 36 are united by friction, rotation in the gravity direction 46 is prevented by the action of the ratchet plate 36 and the ratchet pawl 49. Therefore, even if you release your hand, the water gate will remain open without falling. In order to lower the water gate door, when a 1.0 torque is applied to the handle 1 in the closing direction 12, the nut 28 moves to the left and presses the ratchet plate 33, and due to the frictional force, the nut 288 and the ratchet plate 33 are connected to the input shaft 2. They rotate together, close the nasoto 29 via the doubling pin 32, and rotate it in the direction 12. At this time, the friction plate 25, the ratchet plate 36, the naso 1-2
9. Due to the mechanical brake action by the screw 27, the output shaft 4 rotates following the rotation of the input shaft 2, and the water gate lowers without receiving its own weight on the handle 1. When the lower end of the water gate reaches the bottom of the water, its own weight pushes against the watertight rubber, and the descent due to its own weight stops when the reaction force due to the deformation of the watertight rubber and its own weight are combined. Next, the retightening operation will be explained. When the handle 1 is further turned in the closing direction (■2) from the above state, the output shaft 4 remains stopped rotating due to the reaction force of the watertight rubber, but the nut 28 closes together with the input shaft 2. Since it is rotating in the direction 12, the nut 29 is rotated via the coupling pin 32 and moved to the left. When the nasoto 29 comes into contact with the stopper 40, it becomes a candle-shaped S, the output shaft 2 rotates in the closing direction 12 together with the nasoto 29, and the water gate is retightened by compressing the watertight rubber. At this time, since the ratchet plates 33 and 36 are free, they do not interfere with the rotation of the output shaft 4. Note that this additional tightening force is transmitted to the handle 1 as a reaction, so the magnitude of the additional tightening force can be confirmed by the response. When you let go of the handle 1 after compressing the watertight rubber to a certain extent and retightening it sufficiently, 12
The output shaft 4 is in contact with the strut bar 40 to maintain a locking state, and the output shaft 4 is integrated with the nasoto 29, and furthermore, the counter torque from the watertight rubber is transmitted to the nut 28 via the coupling pin 32. The nanotooth 28 that has received this reaction torque maintains the state in which the ratchet plate 33 is integrally supported between it and the friction plate 24 by the action of the screws 26, and is moved in the anti-gravity action direction 47 by the action of the radius claw 45. (Watertight rubber reaction force 1.
Since the watertight rubber is prevented from rotating in the direction of the lock, the watertight rubber remains compressed and the tightening force is maintained. That is, the action of the additional tightening force holding brake gear is performed. Next, when raising the water gate again, turn the handle 1 in the opening direction 11, and the nanoto 28 will try to move to the left due to the action of the screw 26, which is a left-hand thread, and the ratcheso 1 and plate 3
The restraint due to friction with 3 loosens, and the handle rolls slightly in the open direction. However, at this time, the nut 28 is nil with the brake lining 35 and does not slip <4I.
Since the handle 1 is separated in the dni direction, the handle 1 does not need to resist this sliding friction torque, and only needs to overcome the thread surface friction torque of the screw 26, so the release torque may be small. Due to the reaction force from the watertight rubber, the output shaft 4 is still being torqued in the anti-gravity direction 47, so the output shaft 4 is
The amount of compression of the watertight rubber decreases. This action is similar to a mechanical brake in which the direction of gravity is reversed (although the rubber reaction force corresponding to gravity gradually decreases). Therefore, the reaction force of the watertight rubber is not transmitted to the handle l. In this way, the water gate rises following the rotation of the handle l in the opening direction 11, the deformation of the watertight rubber is recovered, the reaction force is reduced, and it is balanced with the own weight of the water gate. Furthermore, if you turn the handle l in the opening direction 11, the nut 28
moves to the right and comes into contact with the stopper 39 to become in a closed state, and the nasoto 29 is turned by the nut 28 and moves to the right and becomes integrated with the ratchet plate 36 and the output shaft 4, returning to the original state and raising the water gate. As described above, the mechanical brake mechanism using the ratchet plate 36 and the tightening force holding brake using the ratchet plate 33 are arranged extremely compactly on the central axis of one input shaft and output shaft. Ru. As the sliding shaft joint, in addition to the one using the doubling pin 32, one using a spline may be used. In addition to the above embodiments, as a reverse rotation prevention mechanism, a cam clamp notch as shown in Figure 1 of Japanese Patent Application No. 63-65336 is used for a mechanical brake, and a ratchet plate 33 is used for an additional tightening force holding brake. For example, by doing this, the water gate door is quiet when going up and down, and when tightening it makes a rattling sound, so that it can be confirmed that the tightening operation is being performed not only by the response of the handle 1 but also by the sound. However, the arrangement of the reverse prevention mechanism is not limited to this.
They may be replaced, both may be of the same type, or other types of reverse prevention mechanisms may be used. Contrary to the embodiment shown in Fig. 1, the mechanical brake is connected to the input shaft 2.
A brake for maintaining additional tightening force may be provided on the output shaft 416 side. At this time, the screw 26 of the input shaft 2 is a right-handed screw, and the screw 27 of the output shaft 4 is a left-handed screw. In this case, the weight of the handle becomes slightly heavier when the additional tightening is released, but it becomes lighter when the mechanical brake is released when the load is lowered, compared to the case of the above-described embodiment. Note that the driving force to the input shaft may be provided by a prime mover such as a motor or an engine. The load can be applied to items other than water gates that require not only lifting and lowering operations but also pressing operations against the floor surface and maintaining the pressed state. [Effects of the Invention] According to the present invention, the input shaft and the output shaft are arranged on one central axis, and the mechanical brake and the retightening force holding brake can also be arranged on the same axis, resulting in an extremely compact structure. In addition, the number of shafts of the gearbox is reduced, making processing and assembly easier, which is extremely effective.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of an embodiment of the present invention, and FIG. 2 is an explanatory diagram showing an example of the arrangement of a brake device. DESCRIPTION OF SYMBOLS 1... Handle, 2... Input shaft, 3... Brake device, 4... Output shaft, 5... Multi-plate clamp, 6...
・Pinion shaft, 7... Centrifugal brake, 8... Binion, 9... Gear, 10... Pinion, 11... Opening direction, 12... Closing direction, l3... Gear box, 14 ...Casing, 15...Flange metal,
16... Bearing, 18... Rolling bearing, 19... Center shaft, 20... Guide hole, 21... Guide pin, 22
...Friction surface, 23...Friction surface, 24...Friction plate,
25...Friction plate, 26...Screw, 27...Screw,
28...Nut, 29...Nut, 30...Friction surface, 31...Friction surface, 32...Coupling bottle, 3
3... Ratchet plate, 34... Brake lining, 35... Brake lining, 36... Radie plate, 37... Brake lining, 38... Brake lining, 39.40... Stopper, 42...
・Ratchet tooth, 43...bottle, 44...spring,
45... Ratchet claw, 46... For gravity action, 4
7... For anti-gravity action, 48... Spring, 49...
Ratchet Noto Claw.

Claims (1)

[Claims] (1) In a braking device inserted into the rotational drive force transmission mechanism of a weight-lowering lifting device that raises and lowers a load using rotational drive force and gravity from a manual or prime mover, the input shaft and the output shaft, They are arranged with their respective shaft ends facing each other on one central axis, and each of the input shaft and the output shaft has (A) a threaded portion at the shaft end, and (B) a threaded portion on the shaft end side of the threaded portion. (C) a friction plate fixed to the input shaft or the output shaft; (D) a nut screwed into the threaded portion; (E) between the nut and the friction plate. , a reversal prevention mechanism that is rotatably supported in one direction with respect to the input shaft or the output shaft, and that engages and disengages the nut and the friction plate by a frictional action, the nut of the input shaft and the The nut of the output shaft is engaged with a sliding shaft joint that does not restrain each other in the axial direction but restrains each other in the rotational direction, and the threaded part of the input shaft and the threaded part of the output shaft are An elevating device comprising screws twisted in opposite directions, and wherein the input shaft reverse rotation prevention mechanism and the output shaft reverse rotation prevention mechanism have mutually opposite rotation permissible directions. brake equipment.