JPH05563Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a cylinder locking device that mechanically locks a cylinder at a desired position.

[Prior Art] A cylinder is used as a driving machine for moving a movable body according to a desired purpose. Also, depending on the situation, it may be necessary to fix this movable body. Conventionally, methods for fixing a movable body moved by a cylinder include mechanically coupling the movable body to a support body or injecting working fluid into the inside of the cylinder. The cylinder is held at the end of its stroke by the internal pressure reaction force generated by the working fluid.

[Problems to be solved by the invention] However, the above-described method for fixing a movable body has the following problems.

First, in the method of mechanically coupling the movable body to the support body, if the movable body slides while being guided by the support body, such as a slider, it is relatively easy to mechanically couple the movable body and the support body. However, if the movable body is something like an arm that rotates relative to the support, the only joint between the movable body and the support is the rotating part, so under conditions where a large load is applied to the movable body, the movable body cannot move at the engagement point. It is difficult to stabilize the body.

Next, when sealing the working fluid in the cylinder to lock the cylinder and fix the movable body,
Leakage of working fluid from the valves of the cylinder itself becomes a problem. Especially when the working fluid is a gas such as air, leakage is large and it is extremely difficult to lock the cylinder. Furthermore, if the working fluid is gas, it cannot be completely fixed due to its compressibility.

In view of the above circumstances, the present invention aims to provide a cylinder locking device that can mechanically lock the cylinder itself.

[Means for Solving the Problems] The present invention makes the half-cylinder body fitted into the cylinder body rotatable around the vicinity including the cylinder rod pivot point, and also has a structure inside the half-cylinder body that engages with the end face of the cylinder rod cover. It is characterized by having an inner flange that fits together.

[Function] When the cylinder is extended or retracted, when the half-cylindrical body is rotated and fitted into the cylinder, the inner flange engages with the cylinder rod cover and restricts the retraction and extension movements. To unlock the cylinder, it is sufficient to simply remove the half cylinder from the cylinder.

[Example] Hereinafter, one example of the present invention will be described based on the drawings.

Referring to FIG. 1, the locking member will be explained.

A pair of left and right brackets 2 are fixed to the base end of a semi-cylindrical body 1 having an inner diameter approximately equal to the outer diameter of the cylinder rod cover, and a pin is fitted into the brackets 2 to pivotally connect the tip of the cylinder rod to the movable body. Drill possible mounting holes 3. Further, inner flanges 4 and 5 are fixed at required positions inside the semi-cylindrical body 1. Inner guard 4,5
The semicircular plate has a semicircular arc shape with a semicircular notch approximately equal to the outer diameter of the cylinder tube in the center thereof, and each of the semicircular plates abuts on the end face of the cylinder rod cover.

Next, a locking device using the locking member having the above structure will be explained with reference to FIGS. 2 to 4.

2 to 4 show an example in which a locking device is installed in the cylinder body 9 for raising and lowering the earth removal plate of a mini power shovel.

An arm 7 is provided on the lower body 6 so as to be tiltable, and an earth removal plate 8 is fixed to the tip of the arm 7. The clevis portion of the cylinder body 9 is pivotally connected to the lower vehicle body 6 through a pin 10, and the tip of a rod 11 is pivotally connected through a pin 13 to a bracket 12 provided protruding from the upper end of the arm. Both ends of the pin 13 are made to protrude,
The mounting hole 3 of the lock member 14 is rotatably fitted into the protruding end.

In FIG. 2, the cylinder is retracted, and the cylinder is extended. In both cases, the UL position of the locking member 14 is in the unlocked state, and the L position is in the locked state.

First, the cylinder lock state when the cylinder is retracted will be explained.

The cylinder is shortened to the stroke end, and the lock member 14 is rotated counterclockwise to the L position. The notches of the inner flanges 4 and 5 fit into the cylinder tube, and the proximal inner flanges 5 abut against the clevis side end surface of the rod cover 15. Therefore, the cylinder body 9
is connected to the pin 13 via the locking member 14, and the extension movement of the cylinder is mechanically restrained even if the pressure of the working fluid is released.

The lock can be released by supplying working fluid in the contraction direction to the cylinder body 9 and rotating the lock member 14 clockwise to the UL position.

Next, the cylinder lock state when the cylinder is extended will be explained.

The locking member 14 is the same as when the cylinder body 9 is extended to the stroke end and locked when retracted.
Rotate from the UL position to the L position. The tip of the semi-cylindrical body 1 fits into the rod cover 15, and the tip inner collar 4 comes into contact with the rod-side end surface of the rod cover. This restricts the contraction and contraction movement of the cylinder body 9, resulting in a locked state.

To release the lock, the lock member 14 may be brought to the UL position by supplying working fluid to the cylinder body 9 in the direction of extension.

As described above, in this device, locking the cylinder in the extended state, locking the cylinder in the contracted state, and releasing each of them are not only done by rotating the locking member but also by one-touch operation.

Here, an example of application of the present invention is shown in FIG.

The machine shown in FIG. 5 is based on a working machine such as a bucket hoe, and has a rail traveling function added to the working machine so that it can perform various tasks.
In FIG. 5, a tamper 32 is attached to the tip of the arm 29 for compacting the roadbed.

The outline will be explained below.

An earth removal plate 22 is fixed to the tip of an arm 21 which is provided so as to be tiltable in the front and back of the lower traveling body 20 of the backhoe, and the earth removal plate cylinder 2
3 so that it can be tilted.

A rail running wheel unit 25 is provided on each of the front and back earth removal plates 22, and one of the running wheel units 25 is equipped with a drive motor so that it can be driven.

A boom 27 is provided on the upper rotating body 26 so as to be able to rise and fall freely, and can be raised and lowered by a boom cylinder 28, and an arm 29 is provided rotatably at the tip of the boom and can be rotated by an arm cylinder 30. A bar 31 extending horizontally is fixed to the tip of the arm 29, and a tie tamper 32 is attached to both ends of the bar 31.

In addition, in FIG. 5, 33 indicates a roadbed, 34 indicates sleepers, and 35 indicates a rail.

The arm 21 is pulled up by the earth removal plate cylinder 23, and each traveling wheel unit 25 is kept apart from the ground. The lower traveling body 20 is driven to move to the beginning or end of a railroad crossing or rail. After aligning the rail 35 and each traveling wheel unit 25, the earth removal plate cylinder 23 is extended and each traveling wheel unit 2 is aligned.
5 is fitted onto the rail 35 and further extended to ground the lower traveling body 20 and the ground (the upper surface of the rail).
In this state, the working machine is supported via the front and rear wheel units 25.

Next, the locking member 14 described above is rotated to lock the earth removal plate cylinder 23. This lock member 14
Due to the mechanical lock, even if the working machine performs extreme work, the cylinder will not be shortened due to leakage, making it safe.

driving the drive motor through operation by a driver;
By rotating the running wheels of the running wheel unit 25, the working machine can move forward or backward to a predetermined compaction area.

Furthermore, the boom cylinder 28 and the arm cylinder 3
0 operation, the boom 27 is raised and lowered, the arm 29 is rotated, and the upper rotating body 26 is rotated to raise and lower the titer 3.
Perform compaction work according to 2. This compaction work position can be changed as appropriate by traveling on the rails by the traveling wheel unit 25, and after all, compaction work can be performed at a desired location and within a desired range.

In the above embodiment, two inner flanges are provided to engage the cylinder rod cover, but in cases where it is necessary to restrict only the contraction or expansion of the cylinder, it is only necessary to provide one of them. Of course, the semi-cylindrical body provided with the inner flange may have a rectangular shape. Further, the pivoting position of the locking member may be other than the cylinder rod pivoting point and may be in the vicinity thereof.

[Effects of the invention] As described above, according to the invention, the mechanical locking of the cylinder can be performed reliably and easily with a simple structure.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a locking member according to the present invention, Fig. 2 is a side view showing one embodiment of the present invention, Fig. 3 is a front plan view of the same, and Fig. 4 is an arrow taken along the line A-A in Fig. 3. The perspective view, FIG. 5, is an explanatory diagram showing an application example of the present invention. 1 is a semi-cylindrical body, 4 and 5 are inner flanges, 14 is a lock member, 15 is a rod cover, and 9 is a cylinder body.

Claims (1)

[Scope of utility model registration request] A cylinder lock characterized in that a semi-cylindrical body fitted into the cylinder body is rotatable around a vicinity including a cylinder rod pivot point, and an inner flange is provided on the inside of the half-cylindrical body to engage with an end face of the cylinder rod cover. Device.