JP2537777Y2 - Cargo handling balancer - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a weightless balancer for cargo handling.

[0002]

2. Description of the Related Art When a load is moved in a three-dimensional space, a so-called manual loader-type load-handling balancer is used, which moves vertically in a vertical direction by power and manually turns and moves horizontally. It has been known.
Japanese Patent Publication No. 58-12196 discloses a cargo handling balancer that employs a parallel link mechanism as an arm device for holding and moving a load, and uses an air cylinder device to load-balance drive the arm device. ing.

[0003] In the above-mentioned cargo handling balancer, the cylinder housing of the air cylinder device is fixed to the base, the piston rod is oriented vertically, and the arm device has a bracket attached to the tip of the piston rod, and the arm is attached to the bracket. And a fulcrum for supporting the arm, and the other fulcrum is fixed to the base. Further, the arm device is provided with an arm for preventing its own weight from becoming an excessive load for the forward and backward movement of the arm. Is extended rearward and a counterweight is provided in the extension.

In the above-described counterweight type arm device, even if the posture of the parallel link mechanism changes, the balance load does not change and the balance is easy to balance. On the other hand, since the arm with the counterweight extends to the rear of the base, There is a disadvantage that workability in a narrow place is poor.

[0005] A load balancer employing a spring type arm device as shown in FIG. 4 is also known. The load balancer arm device 10 includes a well-known parallel four-sided link mechanism including a main arm 11, a parallel rod 12 parallel thereto, a suspension arm 13, and a link 14 parallel thereto. Arm 13
And tension coil spring 1 between base and not shown
By extending the arm 5, the weight of the arm device 10 is supported, and the flow of the suspension arm 13 in the front-rear direction is suppressed.

The load balancer of the spring supporting type is light in weight and easy to assemble. However, the tension force on the spring 15 changes depending on the attitude of the parallel link mechanism, and the flow phenomenon of the arm device 10 is sufficiently compensated. It has the disadvantage of not being able to do so.

[0007]

The object of the present invention is to provide a cargo handling balancer which solves the above-mentioned conventional problems. Another object of the present invention is to provide a cargo handling balancer in which the positioning of the tip of the suspension arm is difficult due to the compressibility of air.

[0008]

According to a first aspect of the present invention, there is provided a parallel arm link mechanism including a main arm, a rod parallel to the main arm, a suspension arm, and a link parallel to the main arm.
An arm device supported on a horizontally rotatable base, and a cargo handling balancer including an air cylinder provided in connection with a fulcrum of the arm device and driving the arm device in a balanced manner, the tip end of the main arm and An air cylinder is provided between the bases of the arm.

The invention of claim 2 is characterized in that a lock device is provided on each of the two air cylinders, and a lock device for restricting horizontal rotation is provided on the base.

[0010]

According to the first aspect of the present invention, the suspension arm is moved forward and backward even if the attitude of the parallelogram link mechanism changes by adjusting the thrust of the air cylinder disposed on the main arm to support the weight of the arm device. Regulate swinging.

In the invention of claim 2, each of the lock devices regulates the vertical swing of the arm device and the horizontal rotation around the pivot axis.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an overall side view of the cargo handling balancer 1. The cargo handling balancer 1 includes an arm device 10 for holding and moving a load, and an air cylinder 20 for driving the arm device 10 in balance.

The arm device 10 includes a main arm 11, a parallel rod 12 parallel to the main arm 11, and a suspension arm 13,
The arm device 10 is supported between a pair of side plates 2 and 2, and the side plates 2 and 2 are horizontally rotated on a support 4 erected on a bogie 3. It is fixed to a base (not shown) which is supported as possible.

The driving air cylinder 20 is fixed to the side plates 2 and 2, and the tip of the piston rod of the cylinder 20 and the base of the main arm 11 are connected. An air cylinder 17 is disposed between the distal end of the main arm 11 and the base of the arm 11, and the thrust of the air cylinder 17 is adjusted to support the weight of the arm device 10. Even if the posture changes, the suspension arm 13 is prevented from swinging back and forth. Note that a regulator may be added to the air cylinder 17.

Thus, the cylinder 20 is mounted on the suspension arm 1.
The cylinder 20 is driven by operating an operation section (not shown) provided in the vicinity of an attachment mounting flange 16 for holding a luggage provided at the distal end of the cylinder 3.
When the piston rod is moved up and down,
The balance driving is performed so that the relative load to the load supported by the arm device 10 becomes zero.

Reference numerals 22 and 24 indicate the air cylinder 17.
And a lock device provided on the drive cylinder 20, respectively. Reference numeral 26 denotes a lock device provided on the base.
As shown in the cross-sectional view of FIG.
2 and a piston 33 slidably fitted to 2 and a brake arm 34 are arranged. A tapered surface 35 is formed on the upper surface of the piston 33 (the side facing the brake arm 34), and the tapered surface 35 is formed on the lower end of the brake arm 34.
And a brake shoe 37 at the upper end facing the peripheral surface of the shaft 32.

In the lock devices 22, 24, FIG.
As shown in (a), if the compressed air is supplied from the upper air hole 38 (the air hole on the taper surface 35 side of the piston 33) and the compressed air is exhausted from the lower air hole 39, the piston 33 descends and the brake is applied. The shoe 37 is separated from the peripheral surface of the shaft 32, and the lock is released. On the other hand, as shown in FIG. 2B, when the compressed air is supplied from the lower air hole 39 and the compressed air is exhausted from the upper air hole 38, the piston 33 rises, so that the brake shoe 37 And it is in a locked state.

Next, the lock device 26 will be described with reference to the sectional view shown in FIG. A brake plate 42 is installed on the top of the support column 4 so as to surround the turning shaft 41 and the base 5, and an air-driven lock device 26 is provided for the brake plate 42. The lock device 26 includes brake shoes 43, 43 provided opposite to the upper and lower surfaces of a brake plate 42,
An air cylinder 45 for vertically moving the brake shoes 43, 43 via the links 44, 44 is provided.

The load balancer 1 incorporates a well-known detection device for detecting the weight under load, and this device detects the weight of the load and the driving air cylinder 20 operates.
The thrust of the cylinder and the weight of the load are balanced, and the load can be moved with an extremely small operation force. Conventionally, in order to position and fix the attachment mounting flange 16, the air circuit of the driving air cylinder 20 is shut off to set the vertical position of the cylinder rod. The rocking motion in the vertical direction can be restricted by the lock devices 22 and 24, and the horizontal rotation around the pivot 41 can be restricted by the lock device 26.

[0020]

According to the first aspect of the present invention, since the arm device is equilibrium-supported by the air cylinder, the balance can be easily and reliably set. Further, since the air cylinder can be installed compactly along with the main arm, the cargo handling balancer has good workability in a narrow place.

Since the cargo handling balancer according to the second aspect is provided with an air-driven locking device on each operating shaft, the tip of the suspension arm can be easily and reliably positioned. Therefore, it is possible to work in a state in which a tool or the like is fixed and held at the tip of the suspension arm, and thus, a new use as a cargo handling balancer is developed.

[Brief description of the drawings]

FIG. 1 is an overall side view of a cargo handling balancer.

FIG. 2 shows a lock device 2 provided on air cylinders 17 and 20.
2A and 2B are cross-sectional views, wherein FIG. 1A shows an unlocked state and FIG. 1B shows a locked state.

FIG. 3 is a cross-sectional view of an air-driven lock device provided on a base.

FIG. 4 is an overall side view of a conventional spring-supporting cargo handling balancer.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Load balancer 5 Base 10 Arm device 11 Main arm 13 Hanging arm 17 Air cylinder 20 Driving air cylinder 22, 24, 26 Lock device 37, 43 Brake shoe 41 Revolving shaft 42 Brake plate

Claims (2)

(57) [Scope of request for utility model registration] 1. An arm device comprising a main arm, a rod parallel thereto, a hanging arm, and a parallelogram link mechanism comprising a link parallel to the main arm and supported on a horizontally rotatable base. An air cylinder disposed between the tip of the main arm and the base of the arm in a cargo handling balancer that is provided in association with a fulcrum of the arm device and that drives the balance of the arm device. A balancer for cargo handling. 2. The load handling balancer according to claim 1, wherein a lock device is provided on each of the air cylinders, and a lock device for restricting horizontal rotation is provided on the base.