JPH0581199U - Balancer for cargo handling - Google Patents

Abstract

(57) [Summary] [Purpose] The external dimensions are not bulky, making it suitable for work in tight spaces. [Configuration] Before the cargo handling work, the flange 16 is adjusted to a horizontal state. During operation of the cargo handling balancer, the suspension arm 13 rotates about the support shaft 30 as the parallelogram link mechanism moves. However, the bracket 31 is fixed to the sprocket 32 via the support shaft 30, the sprocket 32 is connected to the sprocket 34 via the chain 35, and the sprocket 40 coaxial with the sprocket 34 is connected to the sprocket 43 via the chain 44. Because they are connected, the bracket 31 is independent of the rotation of the suspension arm 13. Therefore, the bracket 31 and the flange 16
The mounting angle of the flange 16 is always constant regardless of the movement in the front-back, left-right, or up-down directions.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a weightless balancer for cargo handling, and particularly to an improvement of an arm device constituting the balancer.

[0002]

[Prior art and its problems]

 When moving a load in a three-dimensional space, it is known to use a so-called manual loader type cargo handling balancer that vertically moves with power and manually turns and horizontally moves. 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 drive a load balance of the arm device. Has been.

In the above cargo handling balancer, the cylinder housing of the air cylinder device is fixed to the base, the piston rod is directed in the vertical direction, and the arm device has a bracket attached to the tip end of the piston rod. To construct one fulcrum to support the arm, and to fix the other fulcrum to the base, and to prevent the arm device's own weight from exerting an excessive load on the back and forth movement of the arm. The arm is extended rearward and a balance weight is provided at the extension.

However, a cargo handling balancer employing an arm device of a double parallel link system as shown in FIG. 3 is also known. The arm device 10 of the cargo handling balancer comprises a main arm 11, a parallel rod 12 parallel to the main arm 11, a hanging arm 13, and a well-known horizontal four-sided link mechanism including a link 14 parallel to the main arm 11. Auxiliary rods 15a and 15b are connected to the outside of the main arm 11 and the hanging arm 13 with a bell crank 18 interposed, and the main arm 11 and the auxiliary rod 15a are parallel to each other, and the hanging arm 13 and the auxiliary rod 15b are parallel to each other. It is arranged so that.

According to this cargo handling balancer, the level of the mounting bracket 22 of the hook 21 can be constantly kept constant during operation by operating the air cylinder 20. However, since the arm device has a large outer size, it is not suitable for work in a narrow space, and has a drawback that the number of parts constituting the arm device is large.

[0006]

[The purpose of the device]

 An object of the present invention is to provide a cargo handling balancer that solves the above conventional problems.

[0007]

[Device configuration]

 The present invention provides a main arm, a rod parallel to the main arm, an arm device composed of a hanging arm and a parallel four-sided link mechanism composed of links parallel to the main arm, and a fulcrum of the arm device. In a balancer for cargo handling consisting of an air cylinder that balance-drives the arm device, sprockets are attached to the support shafts at both ends of the main arm and the suspension arm, and the main shaft is connected to the suspension arm. Is connected to the sprocket, and a suspension member is attached to the end of the suspension arm via a support shaft. When the suspension arm is moved, the suspension member is always horizontal. As described above, the chain is wound around each sprocket.

[0008]

[Action]

 The cargo handling balancer is used by mounting a load on a suspension member of an arm device and supplying compressed air of a predetermined pressure to an air cylinder. During operation of the balancer, the suspension arm rotates with the spindle as the center along with the movement of the parallelogram link mechanism. However, the suspension member is fixed to the front sprocket via the support shaft, and the sprocket is connected to the rear sprocket via a chain. Therefore, the suspending member is independent of the rotation of the suspending arm, and the angle with the horizontal plane is always constant no matter which position the suspending member moves.

[0009]

【Example】

 Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 2 is an overall side view of the cargo handling balancer 1. The cargo handling balancer 1 is composed of an arm device 10 for holding and moving loads, and an air cylinder 20 for balance-driving the arm device 10.

The arm device 10 includes a main arm 11, a parallel rod 12 parallel to the main arm 11, a suspension arm 13, and a parallel four-sided link mechanism including a link 14 parallel to the main arm 11, and the arm device 10 includes a pair of side plates. The side plates 2 and 2 are supported by a base (not shown) that is horizontally rotatably supported on a column 4 that is erected on the carriage 3.

The air cylinder 20 is fixed to the side plates 2 and 2, and the tip end portion of the piston rod of the cylinder 20 and the base portion of the main arm 11 are connected to each other. The cylinder 20 is driven by operating an operating portion (not shown) provided in the vicinity of the attachment attachment flange 16 for holding the luggage, which is provided at the tip of the suspension arm 13. When is activated, when the piston rod is moved up and down, balance driving is performed so that the relative load to the load supported by the arm device 10 becomes zero.

A balance cylinder 17 is provided between the base of the suspension arm 13 and the base of the main arm 11, and the thrust of the balance cylinder 17 is adjusted to support the weight of the arm device 10. The hanging arm 13 is restricted from swinging back and forth.

Next, the level maintaining mechanism of the attachment mounting flange 16 will be described. In FIG. 1, a bracket 31 having the flange 16 is fixed and a sprocket 32 is attached to a spindle 30 at the tip of the suspension arm 13. Further, a sprocket 34 having the same number of teeth as the sprocket 32 is attached to a support shaft 33 that rotatably connects the main arm 11 and the suspension arm 13, and a chain 35 is wound between both sprockets 32, 34. The chain 35 may be formed by connecting the support shafts 30 and 33 with rods 36 and 36 as shown in the figure, or may be an all-around chain.

Further, a sprocket 40 is attached to the support shaft 33, a sprocket 43 is attached to a support shaft 42 at the base end portion of the main arm 11, and a chain 44 is wound between the both sprockets 40, 43.

Next, the operation of the cargo handling balancer 1 will be described. The cargo handling balancer 1 incorporates a known detection device that detects the weight when loaded, and this device detects the weight of the load and the cylinder 20 operates, balancing the thrust of the cylinder and the weight of the load. It is possible to move luggage with very little operating force. Prior to the cargo handling work, the bracket 31 is fixed to the support shaft 30 by an appropriate locking means, and the flange 16 is adjusted to a desired level (generally a horizontal state).

During operation of the cargo handling balancer 1, the suspension arm 13 rotates about the support shaft 30 as the parallelogram link mechanism moves. However, the bracket 31 is fixed to the sprocket 32 via the support shaft 30, the sprocket 32 is connected to the sprocket 34 via the chain 35, and the sprocket 40 coaxial with the sprocket 34 is connected to the sprocket 43 via the chain 44. The bracket 31 is independent of the rotation of the suspension arm 13 since it is connected to the. Therefore, even if the bracket 31 and the flange 16 move in the front-rear direction, the left-right direction, or the up-down direction, the mounting angle of the flange 16 is always constant.

[0017]

【effect】

 In the cargo handling balancer according to the present invention, the level maintaining mechanism for the hanging member, which is composed of the sprocket and the chain, is provided in the arm device, so that the outer dimension is not bulky and it is suitable for work in a narrow space. In addition, the number of parts constituting the arm device is small, and the device structure is simple.

[Brief description of drawings]

FIG. 1 is a side view of a level maintaining mechanism for a hanging member including a sprocket and a chain.

FIG. 2 is an overall side view of a cargo handling balancer.

FIG. 3 is an overall side view of a conventional cargo handling balancer.

[Explanation of symbols]

 1 Balancer for cargo handling 10 Arm device 11 Main arm 13 Suspending arm 20 Air cylinder 31 Suspending member (bracket) 32 Front sprocket 34 Rear sprocket 35 Chain

Claims (1)

[Scope of utility model registration request] 1. A main arm, a rod parallel to the main arm, an arm device composed of a hanging arm and a parallel four-sided link mechanism including links parallel to the main arm, and a fulcrum of the arm device. In a cargo handling balancer provided with an air cylinder that balance-drives the arm device, a sprocket is attached to support shafts at both ends of the main arm and the suspension arm, and a support shaft that connects the main arm and the suspension arm. The sprocket is connected to the sprocket, and a suspension member is attached to the tip end of the suspension arm via a support shaft so that the suspension member is always horizontal when the suspension arm is moved. As described above, a cargo handling balancer characterized by winding a chain between each sprocket.