JP3404644B2 - Telescopic slide rod coupling device for telescopic device - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a telescopic device. In particular, the invention relates to a slide rod coupling and uncoupling device for a telescopic device that expands and contracts by coupling and uncoupling a plurality of slide rods.

[0002]

2. Description of the Related Art As a mast of a forklift is expanded or contracted by hydraulic pressure, and the mast and the hydraulic cylinder have poor visibility, and it is necessary to expand and contract the mast of the crane. Is
Because it is stretched by hydraulic pressure or wire, there is a risk of cutting the wire, the wire part of the crane needs to be inspected because of the risk of cutting, the arm part of the construction machine is large and obstructive, the robot arm It is difficult to expand and contract in many steps, and the jack cannot be extended in many steps,
I can't shrink things like towers when I don't need them,
The height, width and length of container carriers cannot be changed.

[0003]

Conventional masts for forklift trucks generally have two or three stages. Especially in the 3-stage mast, there is a cylinder in the center of the mast, which reduces visibility. Also, if the mast is shortened, the visibility is good and the work becomes easier. Cranes may need to be inspected from time to time as there is a risk of cutting the wire, and if there is a risk of cutting it may be necessary to replace the wire. In addition, the crane work sways because it is suspended by wires, but if the sway is stopped, the work will be easier. In a construction machine, for example, in a backhoe, the arm portion can be bent, but it cannot be expanded and contracted. If it can be expanded and contracted, it will become smaller, and it will be possible to newly expand and contract the arm. For robots, especially for transportation, it is advantageous if the arm extends long. With jacks, to lift something like a building higher, you have to re-jack it, but if you extend it many steps, you don't need it. Things like towers, such as building towers and rocket launchers, are easy to work with if they can be raised to the required height when needed, and can be moved easily when they are not needed. With a container carrier, if you can change the height, width, and length, you can easily straddle things, and you can carry many containers at once,
The height should be increased only when necessary.

[0004]

SUMMARY OF THE INVENTION Claims 1, 2 of the present invention
The telescopic device described in 3 includes an arm portion composed of a plurality of slide rods slidably fitted to each other, a device for supporting and driving each of the slide rods, a device for coupling during extension, and a device for releasing coupling for contraction. In addition, the device further comprises a device for fixing the slide rod, which does not matter whether it extends or contracts, so as not to move.

[0005]

With the above construction, when the slide rod is extended, the slide rod is slid by the driving device, is joined by the joining device, and is supported by the supporting device, so that the length can be made to be a required length, and the contraction is released by the joining device. The slide lever is slid and contracted by the drive device, so it can be made smaller by shortening the slide rod, and it can be made longer when extended by increasing the number of slide rods. By attaching a device to prevent it from falling down, it can be used like a hanging wire for a crane.

[0006]

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 to 11 show the present embodiment, in which 1 is a telescopic device configured to be telescopic, and 2, 3, 4 are concentrically fitted arm portions of a slide rod, and 5 is It is a non-sliding arm part, and is mainly composed of a rotary shaft 6 with a screw for moving it up and down, and a device 10 for connecting and disconnecting the slide rod, and other parts will be described together with the operation of this embodiment.

First, when the telescopic device is in the most retracted state, the slide rods 2, 3, 4 are located inside the arm portion 5, and when the slide rods 2 are to be extended, the slide rod 2 located at the innermost position is slid first. However, when the slide rod 2 is contracted, the female screw 12 at the bottom is engaged with the male screw 11 of the rotary shaft 6, and the rotary rod 6 is rotated by the rotary drive device 9, whereby the slide rod 2 is raised. , The step 7 that prevents the
The slide rod 3 is pulled up by the slide rod 2 when hitting the upper part 8 of the slide rod, and the female screw 12 of the slide rod 3 and the male screw 11 of the rotary shaft are engaged with each other, and the rotation of the rotary shaft 6 causes the slide rod 3 to rotate. 2 and the slide rod 3 rise together. When the step 7 of the slide rod 2 comes to the upper step 8 of the slide rod 3, the lock pin 13 of the connecting means 10 of the slide rod 2
The position of A and the locking hole 24 of the slide rod 3 are aligned. The coupling means 10 is incorporated in the bottom portions of the slide rods 2 and 3, and as shown in FIG. 2, four spaces 15 are formed, one of which is used to fix the bottom portion to the arm portion 5 in a fixed manner. Since the cam 16 having the convex portion 20 is provided on the upper and lower sides and the coupling means 10 is arranged so that the concave portion 21 of the ring 14 and the convex portion 20 of the cam move up and down, together with the upper curve of the convex portion 20 of the cam. The ring 14 rotates, and the lock pin 13A having the lock pin convex portion 22 that engages with the lock pin drive groove 23 of the ring enters and leaves the slide rod 2.

When the coupling device 10 moves up with respect to the cam 16, the lock pin 13A comes out of the slide rod 2 and engages with the locking hole 24 of the slide rod 3, and the slide rod 2 and the slide rod 3 move up while being coupled. To do. When it further rises, the female screw 12 of the slide rod 2 separates from the male screw 11 of the rotating shaft, and the ring 14 of the coupling device also separates from the cam 16. Since the slide rod 2 is coupled and supported by the slide rod 3, it is raised.
The same applies to the slide rods 3 and 4. As for the slide rod 4 and the arm portion 5, there is nothing that slides any more, the slide rod 4 is supported by the rotating shaft 6, and the slide rod 4 is held until its step portion 7 hits the upper step portion 8 of the arm portion 5. extend.
Now, when the rotary shaft 6 is rotated in the opposite direction, the slide rod descends, and the coupling means becomes the coupling releasing means and contracts. However, when the coupled slide rods 3 and 4 are lowered and the coupling is released, the slide rod 4 has not yet reached the bottom. You will be in trouble if you lower it by friction. Therefore, slide rods 3 and 4
When the slide rod 4 is released, the slide rod 4 is lowered so that the cam has two convex portions, one is at the same height as the above, and the other is when the slide rod 4 is lowered. The height should be set so that is released. In that case, slide rod 2
4 (b) in which the ring concave portion 21A engages with the convex portion 20A of the cam. However, because of the ring concave portion 21B, it does not engage with the lower convex portion 20B. Also, if the ring recesses 21A and 21B of the slide rod 3 are in the opposite positions to the slide rod 2,
The ring concave portion 21A engages with the convex portion 20B of the lower cam, but the concave portion 21B slips through the convex portion 20A of the upper cam.

As described above, since the slide rod can be connected and disconnected without stopping the slide, it becomes very important in the case of a mast of a forklift, for example. Here, the screw was rotated to slide the slide rod, but any method may be used, for example, the side surface of the slide rod may be a rack gear, which may be slid by rotation of a pinion gear, and two hydraulic cylinders may be used. You may expand and contract by turns. In addition, a number of coupling and decoupling devices can be considered and will be described below. First, in FIG. 7, there are locking holes 24A in the lower portions of the slide rods 2 and 3, and when the slide rod 2 rises, when the step portion 7 of the slide rod 2 comes into contact with the upper step portion 8 of the slide rod 3, the slide rod 2 is moved. Locking hole 24A of 2 and lock pin 1 of slide rod 3
3C is at the same position as shown in FIG. 7C, and the slide rod 3 is pulled up by the slide rod 2, so that the lock pin 13
C also rises, and the lock pin drive slope 23A of the slide rod 4
As a result, the lock pin 13C is pushed and moved into the locking hole 24A, and the slide rods 2 and 3 are coupled to each other (FIG. 7D). Similarly, the slide rods 3 and 4 are also coupled, and the step portion 7 of the slide rod 4 rises until it contacts the upper step portion 8 of the arm portion 5.
When contracting, the slide rod 4 descends, and when the lock pin 13C reaches the recess 24B of the arm portion 5, if the arm 5 is strongly urged by a spring or the like, the slide rod 4 enters the recess 24B of the arm portion 5 and the slide rod 3 And 4 are released, and the arm 5 and the slide rod 4 are connected. The slide rod 3 is also contracted, and the slide rods 2 and 3 are contracted in the same manner, so that the slide rod 3 is connected to 4 and the slide rod 4 is connected to the arm portion 5, respectively.

As shown in FIG. 1, although the length of the arm of each slide rod is different, if the female screw portion of each slide rod is longitudinally split to make it like a worm gear, the length of the slide rod arm is increased. You can do the same. The same applies to the case where two hydraulic cylinders are used and the slide rod is moved up and down, but in that case, as shown in FIG.
The steps can be made the same height. However, in the case of the slide rod lowering, even if the lock pin comes to the position of the recess to be returned, it will be a problem unless it returns for some reason. Therefore, a method for forcibly returning will be described with reference to FIG. First, the slide rod 2 moves up, and the locking hole 24A and the lock pin 13C.
10A in the same position as shown in FIG. 10A, the slide rod 2 and the slide rod 3 rise together to prevent the lock pin 13C from being pushed by the lock pin driving slope 23A and fitted into the locking hole 24A. FIG. 10 (b) in which the two are combined. Lock pins 13C and 13D, and a return member 30 for returning the lock pin
Rotatably supports the connecting rod end shaft 33 of the connecting rod 31, and the connecting rod rotating shaft 32 of the connecting rod 31 is rotatably supported by the slide rods 3 and 4, and the lock pin Figure 13C is
If it moves to the right as in 0 (b), the return member 30 moves to the left. When the slide rods 2 and 3 are combined and lifted, the return member 30 moves to the left as much as the lock pin 13C moves to the right. The same applies to the slide rods 3 and 4.

In the case of contracting, when the slide rod 4 is lowered, when the lower part of the lock pin 13D comes to the upper part of the recess 24B of the arm part 5, the lower part of the return member slope 23B and the upper end of the arm part 5 come into contact with each other. When descending, the return member is forcibly moved to the right, the lock pin 13D is moved to the left by the action of the connecting rod, is fitted in the recess 24B of the arm portion 5, and the coupling between the slide rods 3 and 4 is released. The slide rod 3 descends. The slide rods 2 and 3 can be similarly contracted. In addition, the thickness of the slide rod is not enough,
If it is difficult to install the coupling and uncoupling device, it is possible to make one side of the slide rod thicker, and further, the lock pins 13C and 13D can be pulled out to prevent the coupling from being uncoupled.
It also makes it easier to install the pin retaining device.

When the telescopic device is turned upside down to form a wire portion for hanging a load such as a crane, for example, as shown in FIG.
When the slide rod 2 is slid down by reversing the upper and lower sides, the other slide rods are also lowered by the weight, and the telescopic device does not work. Also, for example, the slide rod 2 may be turned upside down.
If the slide rod 3 rises due to friction etc.,
This also does not work as a telescoping device. Therefore, it is necessary to fix the slide rods so that they do not move except the slide rod. Therefore, for example, if the case of FIG. 7 is turned upside down, even if the slide rod 2 is slid down, the locking hole 24
If A and the lock pin 13C are not in the same position, the slide rods 3 and 4 will not be lowered. The slide rod fixing device of the telescopic device of FIG. 1 will be described. Since the space 15 shown in FIG. 2 is at the top and bottom, it is installed at the position shown in FIG. 17 and explained with reference to FIG.

In some places, a rotary shaft 41 rotatably supported is provided, the upper part of which is integrated with a disk-shaped rotary plate 42, and two convex portions 42A are provided around the rotary shaft 42 in this embodiment. First, the rotation of the rotary shaft 6 causes the slide rod 2 to move up, and at the lower part of the slide rod, there is a meshing groove 43 that meshes with the convex portion 42A on the rotary disk, but the other convex portion 42A slides. Since the rod lower recess 50 comes, it does not mesh. As the slide rod 2 rises, the turntable 42 rotates counterclockwise in FIG. 11C. At that time, the slide rods 3 and 4 have the lock pins 46 fitted and fixed in the lower engaging holes 49.
The convex portion 41A of the rotary shaft hits the convex portion 46B of the lock pin 46 fixing the slide rod 3, and the rotation of the rotary shaft 41 causes the lock pin 46 to slide in the lock pin slide groove 48 fitted therein. , Slide out from the lower locking hole 49 of the slide rod 3. At this time, the step portion of the slide rod 2 and the upper step portion 8 of the slide rod 3 come into contact with each other, and the slide rod 3 is pulled up by the slide rod 2 and extends as described above. Similarly, as the slide rod 3 rises, the slide rod 3 is lifted. Even when the slide rod 4 has been lifted to the end after the fixation of the slide rod 4 is released, the slide rod 4 does not have the meshing groove 43, and the slide rod lower recess 50
Therefore, the rotating shaft 41 does not rotate.

When contracting, the slide rod 4 has finished descending,
When the slide rod 3 descends, the engaging groove 43 of the slide rod 3
The convex portion 42A is fitted to the rotary shaft 4 in FIG.
1 rotates right. Therefore, the lock pin 46 at the lower portion of the slide rod 4 slides because the convex portion 41A of the rotating shaft is fitted in the concave portion 47, and the lower lock hole 4 of the slide rod 4 is engaged.
11 and the slide rod 4 is fixed.
(G). The convex portion 41A of the rotary shaft comes out of the concave portion 47, the rotary shaft 41 can be further rotated to the right, and the lock pin on the slide rod 3 can be similarly fixed to the slide rod 3. However, since it is difficult for the lock pin 46 to slip out for some reason, the fixing of the lock pin will be described. In the state of FIG. 11 (f), the concave portion 47 of the lock pin and the convex portion 41A of the rotary shaft are fitted into each other, so the lock pin cannot move. However, the lock pin 46 and the convex portion 41A of the rotary shaft are shown in FIG.
Then, since the concave portion 47 of the lock pin is removed from the convex portion 41A of the rotating shaft, it may move. In the state of FIG. 11 (f), the lock pin, the retaining pin, the rotation shaft, and the like are in the states of FIGS. 11 (d) and 11 (e) when viewed from the side, and the lock pin 46 does not move. Lock pin 46
There is a retaining pin 45 on the top. The retaining pin 45 is
Since the ring cam 44 is engaged with the ring cam 44 and the ring cam 44 is integral with the rotary shaft 41, the ring cam 44 rotates with the rotation of the rotary shaft. The retaining pin 45 is supported around the side surface and does not rotate.

If the rotary shaft 41 is rotated to the right in FIG. 11 (f), the lock pin 46 moves to the left in FIG. 11 (e), and the lock pin groove 46A is retained in the lock pin 45.
The convex portion 41A of the rotary shaft 41 comes out from the concave portion 47 of the lock pin 46 to which the slide rod is fixed, and the ring cam 44 also rotates due to the rotation of the rotary shaft 41. From the high part of 44A,
Engage the lower 44B portion and lower, locking pin 46
The lock pin 46 is fitted in the groove 46A to prevent the lock pin 46 from coming off. At this time, the convex portion 41A of the rotary shaft 41 is locked by the lock pin 4
Since it has passed through the recess 47 of 6, the rotary shaft 41 can be further rotated to the right, for example, the slide rod 4 can be fixed, and the slide 3 can be fixed by further rotating to the right. Since the left rotation can be performed in the same manner, the slide rod 3 can be unfixed, and further the slide rod 4 can be unfixed.

Regarding lubrication, it seems that lubrication of the male screw of the rotary shaft 6 and the female screw of the slide rod is particularly important.
Although something like grease may be applied, if the female screw of the slide rod is filled with oil, it is lubricated every time the slide rod moves up and down. Furthermore, if the space 15 is closed, the rotary shaft is made into a pipe shape, a valve for stopping backflow is provided, oil is put in the lower part, and the slide rod is moved up and down, it works as a pump every time it moves up and down, and the oil comes from above the rotary shaft. Will come out. When the present invention is used for a wire portion for suspending a load such as an overhead crane, the rotating shaft 6 is made into a pipe-like shape, a pipe is further inserted therein, and the inside pipe is inserted into the arm portion 5.
If you do not rotate it without turning it, you can pass electric cords and hydraulic hoses through the top and bottom of the expansion and contraction device, so you can attach TV cameras, hydraulic motors and various other devices to the tip. If you attach a motor, you can rotate the suspended load freely. When the telescopic device is extended, it becomes a rod shape, so it is like a shock absorber bar and can prevent shaking, and if you attach something like a hydraulic cylinder, you can swing it back and forth and left and right, and no wires are needed.

As described above, the telescopic device of the present invention can be easily multi-staged, and if it is a mast of a forklift, the visibility can be improved and the arm part of the crane and the wire part of the suspension can be improved. It is possible to shorten the length of the arm by using the arm part of the construction machine without worrying about cutting the wire, and it is also possible to expand or contract the arm part of the transportation robot. You can make a multi-stage jack with large expansion and contraction,
If it is a pillar part of the tower, a multi-stage telescopic tower can be created, if it is a pillar part of the container carrier, the height can be changed, and if it is a girder part, the width and length can be changed, and many other new uses are expected. .

[Brief description of drawings]

FIG. 1 is a sectional view of a slide rod arm portion showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a cross-sectional view of the same slide rod in a stretched state.

FIG. 4 is a diagram of a first embodiment of the above-mentioned slide rod coupling and uncoupling device. FIG. 4A is a perspective view of the ring and the cam engagement. Figure 4
(B) An engagement perspective view of a ring and a cam when two convex portions of the cam are provided.

FIG. 5 is a plan view showing a state where the ring and the cam are engaged with each other.

FIG. 6 is a cross-sectional view of the ring and the cam engagement state of the above.

FIG. 7 is a sectional view of a second embodiment of a slide rod coupling and uncoupling device. FIG. 7A is a view showing the vicinity of the lower lock pin. 7 (b), 7 (c) and 7 (d) are views showing the relationship between the locking hole and the lock pin.

FIG. 8 is a cross-sectional view of the above-mentioned slide rod arm portion having the same length.

9 is a cross-sectional view taken along the line AA of FIG.

FIG. 10 is a view showing a lock pin forcibly returning member attached thereto.
FIG. 10A shows the state immediately before the coupling, and FIG. 10B shows the state immediately after the coupling.

FIG. 11 is a view showing the operation of the slide rod fixing device.
FIG. 11 (a) is an engagement view of the sliding rod lower engagement groove and the rotary disk convex portion. FIG. 11 (b) is a side view of the sliding rod lower engagement groove portion. FIG. 11C is a sectional view taken along the line AA of FIG. FIG. 11D is a side view showing the relationship between the rotary shaft, the lock pin, and the retaining pin. FIG. 11E is a side view seen from the left side of FIG. FIG. 11F is a sectional view taken along line BB of FIG. 11D when the slide rod fixing device is incorporated. Figure 11
(G) is sectional drawing which shows the state in which the slide rod was fixed.

[Explanation of symbols]

1 Telescopic device 2, 3, 4, 5 Sliding rod arm and arm 6 Rotating shaft 7, 8 Step 9 Rotating shaft driving device 10 Coupling and decoupling device 11 Male screw 12 Female screw 13 Lock pin 14 Ring 15 Space 16 Cam 17 Slide Rod Fixing Device Assembling Position 20 Convex 21 Ring Recess 22 Lock Pin Convex 23 Lock Pin Driving Groove and Lock Pin Driving Slope and Returning Member Slope 24 Locking Hole 30 Returning Member 31 Connecting Rod 32 Connecting Rod Rotating Shaft 33 Connecting Rod End shaft 41 Rotating shaft 42 Rotating plate 43 Engaging groove 44 Ring cam 45 Locking pin 46 Lock pin 47 Recess 48 Lock pin slide groove 49 Lower locking hole 50 Sliding rod lower recess

Claims (4)

(57) [Claims] 1. A slide device for expanding and contracting a plurality of slide rods fitted to each other by coupling and uncoupling the slide rods, the slide rods extending and contracting without rotating about the slide rods. The slide rod of the rod that slides and extends first and the slide rod that slides and extends next are joined together while sliding, and the slide rod that slides and extends first without stopping the extension of the slide rod An expansion / contraction slide rod coupling device for an expansion / contraction device, wherein the expansion / contraction device is configured to be supported by and extended by a slide rod. 2. A rotating shaft of a supporting and driving device for sliding and sliding the slide of the slide rod of an expansion and contraction device that expands and contracts by coupling and uncoupling a plurality of slide rods fitted to each other. The male and female screws respectively provided on the slide shaft are engaged with each other, and the slide rod is configured to slide by the rotation of the screw provided on the rotary shaft. While the rod does not rotate, the slide rod that slides and extends first collides with the slide rod that slides and extends next, and the slide rod that slides and extends next is slid by the slide rod that slides and extends first. The slide rod that first slides and extends is connected to the slide rod that slides and then extends, and the slide rod that slides and extends next A telescopic slide rod coupling device for a telescopic device, characterized in that a slide rod that slides and extends is supported and extended. 3. A rotary shaft of a support drive device for sliding and sliding the slide of the slide rod of an expansion / contraction device that expands and contracts by coupling and uncoupling a plurality of slide rods fitted to each other. The male and female screws respectively provided on the slide shaft are engaged with each other, and the slide rod is configured to slide by the rotation of the screw provided on the rotary shaft. While the rod does not rotate, the slide rod that slides and extends first collides with the slide rod that slides and extends next, and the slide rod that slides and extends next is slid by the slide rod that slides and extends first. The slide rod that first slides and extends is connected to the slide rod that slides and then extends, and the slide rod that slides and extends next In the telescopic slide rod coupling device of the telescopic device, which is supported by the slide rod that slides and extends, the slide rod that first slides and extends and the slide rod that slides and extends next,
A telescopic slide rod coupling device for a telescopic device, wherein the slide rod that slides and extends first and the slide rod that slides and extends next while sliding together are coupled by a pin. 4. A step is provided in the vicinity of the upper part and the lower part of the slide rod of an expansion / contraction device that slides a plurality of slide rods fitted with each other and connects and disconnects with a connecting pin to expand and contract. By providing a step portion, the lower step portion of the slide rod that slides and extends first collides with the upper step portion of the slide rod that slides and extends next, and An expanding / contracting slide rod coupling device for an expansion / contraction device, characterized in that, when the slide rod that slides and extends is extended, the slide rod that first slides and extends is connected to the slide rod that slides and extends next.