JP2515424Y2 - Electric caster for carrying heavy objects - Google Patents

Description

[Detailed description of the device]

[0001]

[Industrial field of application] This invention is mainly used for loading / unloading and installing heavy objects such as large transformers, large machine tools, air conditioners, etc., and also for transporting articles at various other factories and construction sites. The present invention relates to an electric caster for carrying heavy objects.

[0002]

2. Description of the Related Art Conventionally, a carriage having traveling wheels attached to a lower surface of a pedestal has been used for carrying various heavy goods, and the trolley moves along with various heavy goods placed on the pedestal. I will let you. At this time, an electric caster is also used, in which the traveling wheels attached to the lower surface of the base are driven and rotated by a motor to allow automatic traveling, and this electric caster is called an electric speed roller. A driving motor is provided inside, and the driving force is appropriately reduced to control the driven wheels to rotate.

[0003]

However, in the conventional electric speed roller provided heretofore, it is necessary to incorporate a considerably large motor in order to carry a heavy object, which inevitably results in a large device. It has become complicated and difficult to handle. Not only that, but the motor itself uses a commercial 200 volt power source for power, which limits the place of use and is not suitable for use in general small and medium factories, transportation sites, etc. There was an occasion. Further, the clutch mechanism for connecting and disconnecting the drive transmission has a complicated structure and is relatively large in size, and in this respect as well, it is bulky in weight and cumbersome to handle.

Therefore, the present invention was devised in view of the above existing circumstances, and for example, a miniaturized motor that can be used with a normal commercial power source of 100 V can be adopted as a drive source. Another object of the present invention is to provide an electric caster for transporting heavy objects, which is light in weight and small in size and can be easily handled by a clutch mechanism having a simple structure and light weight.

[0005]

In order to achieve the above-mentioned object, in the present invention, a frame 1 in which a driving wheel 51 and a driven wheel 55 are supported in the front and rear direction and arranged, and a frame 1 in the frame 1. The transport source P includes a drive source 10 mounted / disposed, a reduction mechanism 15 for decelerating and outputting the driving force of the drive source 10, and a clutch mechanism 20 for connecting / disconnecting the output from the reduction mechanism 15 to the drive wheels 51. In an electric caster for mounting and transporting, a clutch mechanism 20 is connected to an output shaft of a reduction mechanism 15 and is rotatably supported so as to be integrally rotated. A drive sprocket that is fixed to a clutch shaft 23 that is rotatable in the clutch 21 and axially slidably supported and that meshes with the drive clutch 21 in an engageable manner. 25, those comprising the drive sprocket 25 from the operating means 31 for operating the release of the engagement or meshing with the drive clutch 21 is slid.

The operating means 31 is fixed to a slide shaft 33 slidably supported between the left and right side walls of the frame 1, and the drive sprocket 2 is provided.
5 is connected to the sister fork 32 that engages with the sister fork 32 that allows the rotation of 5 and is mounted in the frame 1 in a state substantially orthogonal to the sliding direction of the drive sprocket 25. The slide lever 34 is held by the frame 1 so as to support the slide lever 34 by being inserted into one end of the slide lever 34, and the slide lever 34 is tilted along the sliding direction at the time of engagement or disengagement. It comprises a spring shaft 36 in the form of a coil spring that is flexible to move, and a feed screw 38 that is rotationally operated to feed a feed nut 41 connected to the other end of the slide lever 34.

[0007]

In the electric caster for carrying heavy objects according to the present invention, when carrying various objects P to be conveyed, the objects P are placed on the four corners of the bottom surface of the object to be driven and driven. By this driving traveling, the conveyed object P is conveyed to a predetermined place, the direction is changed to right and left by intermittent switching of the driving force in the clutch mechanism 20, and traveling is performed by turning the driving source 10 on and off.
Perform a stop.

At this time, the operating means 31 of the clutch mechanism 20 is operated by rotating the feed screw 38 to feed the feed nut 41 by screwing, and the meshing clutch portion via the spring holder 37 and the sister fork 32 which move substantially in parallel. The drive clutch 21 and the drive sprocket 25 are engaged with each other to transmit the driving force, or the engagement is released to interrupt the driving force.

The cutoff of the driving force separates the drive sprocket 25 meshing with the rotating drive clutch 21, and the feed of the feed nut 41 at this time is a sliding force for moving the slide lever 34 in parallel. The meshing in the meshing clutch portion is not immediately released, and the other end of the slide lever 34 is slid only by inclining it when viewed from the plane without moving the entire slide lever 34 in parallel. Then, when the sliding force gradually increases and becomes larger than the meshing force, the spring shaft 36 on one end side of the slide lever 34 bends, the entire slide lever 34 slides, and the sister fork 32 slides to drive the drive sprocket 25. Separate from the drive clutch 21.

On the contrary, the drive force is transmitted by engaging the rotating drive clutch 21 with the drive sprocket 25 in the separated state, and the feed nut 41 at this time.
Similarly, although the slide force is a sliding force for moving the slide lever 34 in the opposite direction in parallel, it is not at the position where the meshing teeth of the drive sprocket 25 are tightly engaged with the drive clutch 21 in the meshing clutch portion. However, the meshing is not performed immediately, and only the other end side of the slide lever 34 is slid and tilted when viewed from the plane without moving the entire slide lever 34 in parallel. When the sliding force gradually increases and the sliding action at the meshing abutment position in the meshing clutch portion becomes sufficiently large, the flexure of the spring shaft 36 at one end of the slide lever 34 is restored to the original position. Then, the entire slide lever 34 slides, and the sister fork 32 slides to engage the drive sprocket 25 with the drive clutch 21.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. Reference numeral 1 shown in the drawings is a flat box-shaped frame having a substantially rectangular shape in a plane. Arranges the motor, which is the drive source 10,
The clutch mechanism 20 formed in the substantially central portion interrupts the transmission of the driving force to rotate the drive wheel 51 supported in the front portion, and the driven surface 55 is supported in the rear portion together with the driven surface 55. It is designed to run forward and backward.

However, the frame 1 itself is made of a robust material that can support and support a large transformer, a large machine tool, and other objects P that are heavy objects. The rotation shaft 4 and the top plate portion 2 supported on the above-mentioned side through a pivot bearing 3 formed on the top plate portion 2.
A turntable 6 is rotatably supported by a ball bearing 5 arranged on the surface (see FIG. 2). The transported object P placed on the turntable 6 is the frame 1
The load is supported by the side portions, and relative alignment with the frame 1 in any direction is possible.

The drive source 10 is a small motor driven by a commercial power source of, for example, 100 volts, and is mounted between the left and right side walls of the rear portion of the frame 1. Then, the driving force of the driving source 10 is decelerated and output via the reduction mechanism 15 supported and arranged by the substantially cylindrical gear case 9 fixed to the substantially central portion of the frame 1.

The speed reducing mechanism 15 is connected to a wave generator fixed to an input shaft 16 and has a circular shape in which the input teeth of an elliptical flexspline elastically deformed via a ball are connected to the output shaft. The internal teeth of the circular spline are meshed with each other, and the meshing position is moved by the rotating wave generator.The difference between the number of input teeth of the flex spline and the number of output teeth of the circular spline causes the opposite direction. A known drive, which is a so-called harmonic drive, in which the circular spline is rotated at a reduced speed is used. Then, the input shaft 16 is driven to rotate by the transmission chain 17 that hangs around the driving shaft of the drive source 10, and the reduction mechanism 1
By decelerating inside 5 itself, the output is transmitted to the flange washer 18 via the circular spline on the output shaft side.

On the output side of the speed reducing mechanism 15, a clutch mechanism 20 for connecting and disconnecting the driving force output by speed reduction is connected to the speed reducing mechanism 15.
It is installed coaxially with. This clutch mechanism 20
Is rotatably supported in the gear case 9,
A cylindrical drive clutch 21 fixed to the flange washer 18 and rotating integrally with the flange washer 18 and a clutch shaft 23 rotatably supported in the drive clutch 21 and axially slidably supported. The drive sprocket 25 is engaged with the drive clutch 21 so that the drive sprocket 25 can be engaged with the drive clutch 21, and the operating means 31 for sliding the drive sprocket 25 to engage or release the engagement with the drive clutch 21.
It consists of and.

The drive clutch 21 is fixed to the flange washer 18 integrally with the flange washer 18 by bolts or the like, and the bearing 2 near the opening of the gear case 9 is provided.
2 supported by the flange washer 18
It is adapted to be rotated in the gear case 9 following the rotation of the.

The clutch shaft 23 comprises a bearing 24 and a drive clutch 21 arranged on the inner surface of the side wall of the frame 1.
It is slidable in the axial direction between itself and the inside, and
The drive clutch 21 is rotatably supported, and as shown in the drawing, the drive clutch 21 has a cylindrical shape, and the clutch shaft 23 is supported therein. The drive sprocket 25 fixed to the clutch shaft 23 has a meshing clutch structure and is detachably meshed with the open end of the drive clutch 21. When the meshing is engaged, the drive sprocket 25 is rotated integrally with the drive clutch 21 and is constantly rotated when the meshing is released. Rotation is not transmitted by being separated from the drive clutch 21 that is present.
Reference numeral 26 in the drawing denotes a needle bearing that rotatably supports the clutch shaft 23 in the drive clutch 21.

The operating means 31 is fixed to a slide shaft 33 which is slidably supported in the left-right direction between the left and right side walls of the frame 1 so that the drive sprocket 25 can be rotated. A matching sister fork 32, a slide lever 34 which is connected to the sister fork 32 and is arranged in the frame 1 in a state substantially orthogonal to the sliding direction of the drive sprocket 25, and one end of the slide lever 34. To support the slide lever 34 by being inserted,
Spring shaft 36 held on the frame 1
And a feed screw 38 that is rotationally operated to feed a feed nut 41 that is linked to the other end of the slide lever 34.
It consists of and.

The sister fork 32 has a substantially U-shape when viewed from above (see FIG. 3), and engages with the drive sprocket 25 by fitting the tooth portion of the rotating drive sprocket 25 into the recessed portion. As shown in FIG. 2, the sister fork 32 itself supports the slide shaft 33 on the frame 1 so as to be positioned in a hanging circuit of a drive chain 50 described later (see FIG. 2).

The slide lever 34 itself has one end located on the rear side of the frame 1 and the other end located on the frame 1 side.
Is arranged along the front-rear direction of the frame 1 so as to be located at the front part of the slide lever 34, and the connecting pin 35 inserted through the slide lever 34 at the rear side position of the central portion of the slide lever 34 is attached to the sister fork 32. The slide lever 34 and the sister fork 32 are connected by being fitted. That is, the sister fork 32 also moves in parallel by sliding the slide lever 34 substantially in parallel, and the drive sprocket 25 itself slides to engage or disengage from the drive clutch 21. Further, as shown in FIG. 2, one end of the slide lever 34 is bent so as to be inclined downward so that it is positioned substantially at the center of the spring shaft 36.

The spring shaft 36 itself is in the form of a coil spring, and on the rear side of the frame 1 which is one end position of the slide lever 34, the lower end is fitted in an upper opening spring holder 37 fixed to the frame 1 itself. On the other hand, the top plate 2 of the frame 1 supports the upper end of the frame 1 so that the frame 1 is arranged in a substantially standing manner. Also,
The spring shaft 36 itself supports one end of the slide lever 34 by being inserted into a bearing hole opened at one end of the slide lever 34. Further, by fixing the lower end of the spring shaft 36 firmly in the spring holder 37 with the set screw 45, consideration is given so that the spring shaft 36 itself does not come out of the predetermined position even when the spring shaft 36 itself bends.

The feed screw 38 is rotatably supported between the left and right side walls of the front portion of the frame 1 via bearings. In the illustrated example, the feed screw 38 can be rotated from either the left or right side. The rotary knob 39 is fixed to both ends. The feed nut 4 screwed into the feed screw 38
1, the shoulder pin 42 fixed to this is slidable from the front wall of the frame 1 only in the left-right direction so that the feed screw 38 rotates so that the feed nut 38 can rotate.
Is moved to the left and right. In addition, the slide lever 34 is attached to the connecting support pin 43 protruding from the feed nut 41.
The other end of the slide lever 34 is slidably engaged through the slide groove 44, and the slide lever 34 is inclined and intersects at a predetermined angle with respect to the feed nut 41 fed by the rotation of the feed screw 38, and is also substantially orthogonal. I am doing it.

In the operating means 31, as shown in FIG. 3, the rotation of the feed screw 38 by operating the rotary knob 39 causes the feed nut 41 to be fed. At this time, the drive sprocket 2 is attached to the rotating drive clutch 21.
When 5 is meshed and the output is being transmitted,
The feed of the feed nut 41, which is going to be separated, causes the slide lever 34 to slide so as to move in parallel.
This sliding force slides the other end of the slide lever 34 to incline the slide lever 34 when viewed from a plane, but does not immediately slide the entire slide lever 34. Then, when the sliding force gradually increases and the sliding action becomes greater than the engaging action in the meshing clutch portion, the spring shaft 36 on one end side of the slide lever 34 bends as shown in FIG.
By sliding the entire slide lever 34 and sliding the sister fork 32, the drive sprocket 25 is separated from the drive clutch 21, and the drive force is shut off.

Further, when the rotary knob 39 is rotated in the opposite direction, the drive sprocket 25 in a state separated from the drive clutch 21 is engaged with the rotating drive clutch 21 to try to transmit the output power. Feed nut 4
For feeding 1, the slide lever 34 is slid so as to move in parallel in the opposite direction. This sliding force is not at a position where the meshing teeth of the drive sprocket 25 that is not rotating with respect to the rotating drive clutch 21 are properly engaged, so that the entire slide lever 34 is not immediately slid. Instead, the other end of the slide lever 34 is simply slid to incline the slide lever 34 when viewed from a plane. Then, when the sliding force gradually increases and the sliding action at the meshing position in the meshing clutch portion becomes sufficiently large, the flexure of the spring shaft 36 on one end side of the slide lever 34 is restored to the original position. Then, the entire slide lever 34 is slid, and the sister fork 32 is slid to drive the drive sprocket 25.
Is engaged with the drive clutch 21 to transmit the driving force.

As shown in FIG. 5, the operation for selecting the intermittent driving force by the clutch mechanism 20 is "off" or "on" by the arrow corresponding to the direction of rotation of the rotary knob 39.
Is displayed, and it can be confirmed by the left and right positions of the shoulder pin 42 and the protruding / retracting state of the slide shaft 33 from the left and right side walls of the frame 1.

The driving force thus transmitted via the clutch mechanism 20 is transmitted to the roller-shaped drive wheel 51 rotatably supported on the front portion of the frame 1, and as shown in the figure, The drive wheel 51 is driven and rotated via a drive chain 50 that hangs between the driven sprocket 52 fixed to the drive wheel 51 and the drive sprocket 25. Further, it supports the load of the transported object P together with the roller-shaped driven wheel 55 rotatably supported on the rear portion of the frame 1, and rolls on the transportation surface.

Further, if necessary, the driving wheel 51 and the driven wheel 55 are not limited to the case of being formed into a roller shape suitable for supporting a large load as shown in the drawing, but are arranged on each of the left and right sides of the frame 1. It may be formed in a wheel shape. Then, the turntable 6 for mounting the transported object P on the drive wheels 51.
By arranging, the vehicle is driven and driven at the center position of the load, so that the power traveling performance is excellent.

Reference numeral 61 in the drawing denotes a handle stay for connecting a handle (not shown), and reference numeral 62 denotes a protector projectingly formed so as to prevent damage due to contact with another object or collision. .

This invention is constructed as described above,
This will be described as an example of use. As shown in FIG. 6, for example, they are arranged at the four corners of the bottom surface of various large and heavy conveyed objects P, and when conveying the conveyed objects P, they are arranged, for example, on the left and right of the front part. The caster of this invention is remotely operated by a remote control device C or the like, and for example, all of them are interlocked, or they are individually moved forward and backward to drive. By this driving traveling, the conveyed object P can be conveyed to a predetermined place, the direction is changed to the left and right by intermittent switching of the driving force in the clutch mechanism 20, and traveling by the on / off operation of the driving source 10, Stop.

[0030]

The present invention is configured as described above, and therefore, a miniaturized motor can be adopted as the drive source 10, and the entire device is constructed by the clutch mechanism 20 having a simple structure and light weight. It can be constructed in a lightweight and small size, and is easy to handle, and in particular, even a large-sized object P that is heavy in weight can be easily transferred.

That is, according to the present invention, the frame 1 in which the driving wheels 51 and the driven wheels 55 are arranged in the front and rear, the driving source 10 arranged in the frame 1, and the speed reducing mechanism for decelerating and outputting the driving force thereof. 15 and a clutch mechanism 20 for connecting and disconnecting the deceleration output to the drive wheels 51. The clutch mechanism 20 is rotatably supported so as to be linked to the output shaft of the deceleration mechanism 15 and integrally rotated. The cylindrical drive clutch 21 and the clutch shaft 23 that is rotatably supported in the drive clutch 21 and axially slidably supported and engages with the drive clutch 21. The drive sprocket 25 and the drive sprocket 25 are slid to operate the engagement or the release of the engagement with the drive clutch 21. Since consisting work unit 31. The clutch mechanism 20 can be arrangement to the deceleration mechanism 15 coaxially, by reliably operate while being small and lightweight, but which can constitute the entire apparatus compact.

In particular, the operating means 31 of the clutch mechanism 20 is fixed to a slide shaft 33 slidably supported between the left and right side walls of the frame 1.
The drive sprocket 25 is connected to a sister fork 32 that engages with the drive sprocket 25 to enable the rotation of the drive sprocket 25 and the sister fork 32.
5, a slide lever 34 installed in the frame 1 substantially orthogonal to the sliding direction, and a slide lever 34 that is inserted into one end of the slide lever 34 and is supported by the frame 1 so as to support the slide lever 34. When released, the coil spring-shaped spring shaft 36 that is flexible so as to tilt and swing the slide lever 34 along the slide direction and the feed nut 41 that is linked to the other end of the slide lever 34 are rotationally operated so as to be screw-fed. Since the feed screw 38 is made up of a feed screw 38, the feed nut 41 is screw-fed by rotating the feed screw 38, and a slide that moves substantially parallel while being tilted and swung in accordance with the elastic deformation of the spring shaft 36. Drive clutch 21 in the meshing clutch portion via shaft 34 and sister fork 32 The driving force transmitted engagement a drive sprocket 25, or mesh can be cut off the release to driving force.

The cutoff of the driving force separates the drive sprocket 25 meshing with the rotating drive clutch 21. At this time, the slide lever 3
The sliding force acting to move 4 itself in parallel does not immediately release the meshed state unless it is sufficiently larger than the meshing force in the meshing clutch portion. That is, in the meantime, the spring shaft 36 on one end side of the slide lever 34 is in contact with the slide lever 34.
When the slide lever 34 does not move its position while supporting itself, and when a sliding force sufficient to release the meshed state is applied, the spring shaft 36 suddenly bends so that the meshing is released. By sliding, and as a result, the sister fork 32 slides, the drive sprocket 25 can be separated from the drive clutch 21.

On the contrary, the transmission of the driving force is such that the drive sprocket 25 in the separated state is engaged with the rotating dry clutch 21, and at this time, the slide lever 34 itself is moved in parallel in the opposite direction. The sliding force generated is not immediately meshed because the drive sprocket 25 is not in a position allowing meshing with the drive clutch 21 until then. When the sliding force gradually increases and the sliding action at the meshing abutting position in the meshing clutch portion becomes sufficiently large, this time, the flexure of the spring shaft 36 is restored to the original position, and the sliding lever 34 is moved. The entire body slides, and as a result, the sister fork 32 slides so that the drive sprocket 25 can be engaged with the drive clutch 21.

The operation of the operating means 31 in the clutch mechanism 20 can be easily performed from the outside of the frame 1, the operability is good, and the handling is easy.

[Brief description of drawings]

FIG. 1 is a plan sectional view.

FIG. 2 is a side sectional view.

FIG. 3 is a plan sectional view of an essential part showing a clutch mechanism.

FIG. 4 is likewise a side sectional view of a main part.

FIG. 5 is a perspective view.

FIG. 6 is a perspective view of a use state during transportation of a transported object.

[Explanation of symbols]

C Control device P Transported object 1 Frame 2 Top plate 3 Pivot bearing 4 Turning shaft 5 Ball bearing 6 Turntable 9 Gear case 10 Drive source 15 Reduction mechanism 16 Input shaft 17 Transmission chain 18 Flange washer 20 Clutch mechanism 21 Drive clutch 22 Bearings 23 Clutch shafts 24 Bearings 25 Drive sprockets 26 Needle bearings 31 Operating means 32 Sister forks 33 Slide shafts 34 Slide levers 35 Connecting pins 36 Spring shafts 37 Spring holders 38 Feed screws 39 Rotating knobs 41 Feed nuts 42 Shoulder pins 43 Connecting support pins 44 Slide groove 45 Set screw 50 Drive chain 51 Drive wheel 52 Driven sprocket 55 Driven wheel 61 Handle stay 62 Pro Compactors

Claims (1)

(57) [Scope of utility model registration request] 1. A frame in which driving wheels and driven wheels are supported in front and rear, and arranged, a drive source mounted and mounted in the frame, a reduction mechanism for decelerating and outputting a driving force of the drive source, and In an electric caster that includes a clutch mechanism that connects and disconnects the output from the speed reduction mechanism to the drive wheels, the clutch mechanism is connected to the output shaft of the speed reduction mechanism and integrally rotated. And a cylindrical drive clutch that is rotatably supported, and is rotatable in the drive clutch and fixed to a clutch shaft that is axially slidably supported and can be engaged with the drive clutch. A drive sprocket that meshes with the drive sprocket, and an operating means that slides the drive sprocket to engage or release the engagement with the drive clutch. The operating means is fixed to a slide shaft slidably supported between the left and right side walls of the frame, and is connected to a sister fork that engages with the drive sprocket by allowing the drive sprocket to rotate. The slide lever is installed in the frame in a state substantially orthogonal to the slide direction of the drive sprocket, and the slide lever is held by the frame so as to support the slide lever by being inserted into one end of the slide lever. , Rotating operation to screw feed a coil spring-shaped spring shaft that is flexible so that the slide lever tilts and swings along the slide direction when meshing or releasing meshing, and the feed nut linked to the other end of the slide lever Transporting heavy objects Electric caster.