Safety device for lifting work apparatus

Abstract

To provide a safety device for a lifting work apparatus which is not easily damaged even by contacting with obstacles and capable of recovering a function by a member replacement.SOLUTION: A safety device 1 comprises a rod part 10 with a base end rod 12 and a top rod 11 connected telescopically in the longitudinal direction to the base end rod 12 and urged to the top side, a cylindrical cushioning part 20 extrapolated into at least the part of the top rod 11, an alarm part 30 mounted on the outside of the base end rod 11, and a joint part 40 connected to the base end rod 12, that is, the joint part 40 capable of fixing to the upper side of a work deck A1. It is characterized that the alarm part 30 has an alarm device 31 that triggers an alarm upon the contact with the base end of the cushioning part 20 and the cushioning part 20 consists of the members capable of compressively deformable materials in the shortening direction of the rod part 10.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a safety device, and more particularly to a safety device for a lifting work device which is unlikely to be damaged even when it comes into contact with an obstacle and whose function can be restored by replacing parts. [Background technology]

[0002] 2. Description of the Related Art Elevating work devices such as electric aerial work platforms and self-propelled aerial work vehicles are used to perform work at height, such as at construction sites of buildings and the like, inspecting the top ends of tunnels, and repairing bridge piers. The handrails on the work deck of the lifting work equipment are about 1m high, and the upper half of the worker's body is exposed above the handrail. As a result, there have been accidents in which the worker's head hits an obstacle when the work deck is raised, or the worker's upper body gets caught between the obstacle and the work deck (Non-Patent Document 1). Patent Document 1 discloses a safety device attached to an aerial work vehicle, in which a bar frame is provided on the upper outer surface of the work platform, and when the bar frame comes into contact with an obstacle, a limit switch installed on the bar frame stops the work platform. Patent document 2 discloses a safety device that is attached to an aerial work platform, in which when a ring-shaped obstacle detection part extending outside the work platform comes into contact with an obstacle, the pressed shaft part elastically deforms, causing an alarm means to emit sound or light. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 10-7398 [Patent Document 2] JP 2017-88351 A [Non-patent literature]

[0004] [Non-Patent Document 1] "Workplace Accident Case: 'Caught in a Trapped Vehicle by a High-altitude Work Vehicle'", [online], Ministry of Health, Labor and Welfare, [Retrieved September 28, 2023], Internet<URL:https: / / anzeninfo.mhlw.go.jp / anzen_pg / sai_det.aspx?joho_no=507> Summary of the Invention [Problem to be solved by the invention]

[0005] The prior art safety device is structured to absorb the impact caused by contact with an obstacle by the elastic deformation of a coil spring. The coil spring deforms significantly when contacted from the side or diagonally above, but the amount of deformation caused by axial compression is extremely small. Therefore, when the safety device is compressed in the axial direction, the shaft may bend or the pressing force may be directly transmitted to the alarm device, causing the alarm device to be damaged. Furthermore, if the safety device is damaged, the entire device must be discarded and replaced with a new one, resulting in high restoration costs.

[0006] An object of the present invention is to provide a safety device that solves the problems of the prior art as described above. [Means for solving the problem]

[0007] The safety device of the present invention comprises a rod portion having a base end rod and a tip rod connected to the base end rod so as to be freely expandable and contractable in the longitudinal direction and biased toward the tip side, a cylindrical buffer portion extrapolated onto at least a portion of the tip rod, an alarm portion attached to the base end rod, and a joint portion connected to the base end rod and capable of being fixed to an upper portion of the work deck, wherein the alarm portion has an alarm device that sounds upon contact with the base end of the buffer portion, and the buffer portion is made of a material that can be compressed and deformed in the shortening direction of the rod portion.

[0008] In the safety device of the present invention, the tip rod may include a contact end provided at the tip of the tip rod, and a base end of the contact end may be able to abut against the tip of the buffer portion when the tip rod is contracted.

[0009] In the safety device of the present invention, the alarm section may include an alarm folder capable of storing the alarm device, and the alarm folder may be slidably attached to the outside of the base end rod.

[0010] In the safety device of the present invention, the joint portion may include a clamp that clamps and fixes the handrail of the work deck, and a connecting end that is detachably connected to the base end rod.

[0011] The safety device of the present invention may have a warning mark on the outer peripheral surface of the buffer portion to alert workers. Effect of the Invention

[0012] The safety device of the present invention absorbs the axial pressing force caused by contact with an obstacle by shortening the rod section and compressively deforming the buffer section, thereby reducing the impact on the rod section and the alarm device and preventing damage. In addition, because the buffer and joint sections are assembled, parts can be easily replaced, and even if one part is damaged, functionality can be restored by replacing the part. Furthermore, the position at which the alarm device sounds can be easily adjusted on site by changing the length of the rod section or shifting the installation height of the alarm section depending on the height of the handrail and the height of the worker. [Brief description of the drawings]

[0013] [Figure 1] FIG. 1 is an explanatory diagram of a safety device according to the present invention; [Diagram 2] An explanatory diagram of the rod section and the buffer section [Diagram 3] Explanation of the alarm section [Figure 4] Explanation of joint part [Figure 5A] Diagram of how to use the safety device (1) [Figure 5B] Diagram of how to use safety devices (2) [Figure 5C] Diagram of how to use safety devices (3) [Figure 5D] Diagram of how to use safety devices (4) [Figure 5E] Diagram of how to use safety devices (5) DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] The safety device of the present invention will be described in detail below with reference to the drawings. In the present invention, "tip" and "upper" refer to the buffer side of the safety device (i.e., the upper right side in FIG. 1), and "base" and "lower" refer to the joint side (i.e., the lower left side in FIG. 1).

[0015] [Safety device] <1> Overall configuration (Figure 1) The safety device 1 of the present invention is installed on the work deck A1 of the lifting work device A, and is a device for preventing an accident in which a worker is pinched between an obstacle B and the work deck A1 when the work deck A1 is raised. The obstacle B is, for example, a beam of a steel structure, a top of a tunnel, a girder of a bridge, etc. The safety device 1 has a generally long rod-like outer shape, and includes at least a rod portion 10, a buffer portion 20, an alarm portion 30, and a joint portion 40. In detail, the buffer section 20 is fitted onto the distal end rod 11 of the rod section 10 , the alarm section 30 is attached onto the proximal end rod 12 of the rod section 10 , and the proximal end of the proximal end rod 12 is connected to the joint section 40 .

[0016] <1.1> Lifting device The lifting work device A is a device for performing high-altitude work on a construction site of a building or the top of a tunnel, etc. The lifting work device A includes, for example, an electric high-altitude work platform and a self-propelled high-altitude work vehicle. The lifting work device A includes at least a work deck A1 on which a worker rides, a base that is placed on the road surface, and a lifting mechanism that raises and lowers the work deck A1 relative to the base.

[0017] <2> Rod section (Fig. 2) The rod portion 10 is a rod-shaped member that is extendable and retractable. The rod portion 10 includes a distal rod 11 and a proximal rod 12. In this example, a contact end 13 is provided at the distal end of the distal rod 11. The distal rod 11 is connected to the proximal rod 12 so as to be freely extendable in the longitudinal direction, and is biased in the distal direction. In this example, the distal end rod 11 is inserted inside the hollow proximal end rod 12, and the distal end rod 11 is biased in the distal direction by a spring disposed inside the proximal end rod 12. However, this is not limited to the above, and the proximal end rod 12 may be inserted inside the hollow distal end rod 11. Also, biasing may be performed by an elastic string or the like instead of a spring. The contact end 13 extends outward from the tip rod 11 when viewed from the front from the tip side of the tip rod 11, and the base end of the contact end 13 abuts against the tip of the buffer part 20 when the tip rod 11 contracts.

[0018] <3> Buffer section (Fig. 2) The buffer unit 20 is a cylindrical member that has both a buffer function upon contact with the obstacle B and a transmission function to the alarm unit 30. The buffer section 20 is fitted onto at least a part of the tip rod 11. That is, when the rod section 10 is in an extended state, the buffer section 20 may cover a part of the tip rod 11 or may cover the entire length of the tip rod 11. The buffer portion 20 is made of a member that is compressible and deformable in the shortening direction of the rod portion 10. In particular, a cylindrical body made of polyurethane, for example, can be used. In this example, warning signs 20a are displayed on the outer periphery of the buffer section 20. The warning signs 20a are signs that alert workers to caution when working at height. Specifically, signs such as "Watch your head," "Watch when ascending," "Watch out for falls," and "Check safety" can be used.

[0019] <4> Alarm section (Fig. 3) The alarm unit 30 is a device that issues an alarm upon contact with an obstacle B. The alarm unit 30 includes at least an alarm device 31. In this embodiment, an alarm folder 32 capable of accommodating the alarm device 31 is further included, and the alarm device 31 is configured to be freely replaceable within the alarm folder 32. The alarm device 31 is a device that issues an alarm upon contact with the lower end of the buffer section 20. Here, "issue of an alarm" includes sounding of an alarm siren, lighting of an alarm light, or a combination of these. The alarm device 31 may also be connected to the lifting mechanism of the lifting work device A so as to forcibly stop the lifting of the work deck A1 by issuing an alarm. In this example, the alarm device 31 is an alarm buzzer that includes a battery-powered device main body 31a and an alarm button 31b that protrudes from the outer periphery of the device main body 31a. In this embodiment, the alarm holder 32 is made up of a combination of a holding portion 32a that corresponds to the outer shape of the device main body 31a and an outer portion 32b that is slidably attached to the base end rod 12. When the alarm device 31 is set, the alarm button 31b is housed in the holding portion 32a in a direction facing the base end of the buffer portion 20.

[0020] <5> Joint section (Fig. 4) The joint portion 40 is a member for connecting to the work deck A1. The upper part of the joint portion 40 is connected to the base end rod 12 . In this example, the joint portion 40 includes a clamp 41 that clamps and fixes the handrail of the work deck A1, and a connecting end 42 that is detachably connected to the base end rod 12. As the clamp 41, for example, a bracket clamp can be used which includes a bracket that fits into the handrail of the work deck A1 and two bearing screws that press the handrail against the inner surface of the bracket. However, the structure of the joint part 40 is not limited to this, and it may be, for example, a structure in which the lower end is inserted into a cylindrical folder attached to the work deck A1 and fixed, or a structure in which it is fixed to a stand erected on the floor board of the work deck A1. The point is that it is sufficient that the structure can fix the safety device 1 facing upward to the work deck A1.

[0021] <6> How to use safety devices The safety device 1 of the present invention is used, for example, as follows.

[0022] <6.1> Fixing safety devices The safety device 1 is fixed to the handrail of the working deck A1 (FIG. 5A). In detail, with the tip of the rod portion 10 facing upward, the handrail of the work deck A1 is fitted into the clamp 41 of the joint portion 40, and the support screw is screwed in to fix it to the handrail. The positions and number of safety devices 1 fixed to the work deck A1 can be selected arbitrarily depending on the size of the work deck A1, the distance to the obstacle B, etc. Furthermore, by selecting rod portions 10 of different lengths according to the height of the handrails on the work deck A1 and the height of the worker, the length of the safety device 1 can be set as desired.

[0023] <6.2> Raising the work deck When the work deck A1 rises (Figure 5B) and the contact end 13 of the safety device 1 comes into contact with an obstacle B (Figure 5C), the tip rod 11 is pushed downward and the rod portion 10 shortens, and at the same time, the base end of the contact end 13 presses the tip of the buffer portion 20, causing the buffer portion 20 to slide downward along the tip rod 11. If the rod portion 10 does not have the contact end 13, the tip of the buffer portion 20 comes into direct contact with the obstacle B and is pushed down, sliding downward along the tip rod 11.

[0024] <6.3> Activation of alarm device As the work deck A1 continues to rise, the buffer section 20 slides downward and the base end of the buffer section 20 presses the alarm button 31b of the alarm device 31, causing the alarm device 31 to sound (FIG. 5D). This allows the worker to recognize the danger and stop operating the lifting mechanism to stop the ascent or crouch down, thereby preventing an accident such as colliding with obstacle B or being pinched between the work deck A1 and obstacle B.

[0025] <6.4> Buffer function of safety devices If the working deck A1 continues to rise after the alarm device 31 is activated, the buffer portion 20 is pressed against the contact end 13, and is compressed and deformed in the axial direction (FIG. 5E). In addition, in this example, the alarm device 31 pressed against the buffer section 20 slides downward on the base end rod 12 together with the alarm folder 32, thereby reducing the pressing force on the alarm device 31 caused by the pressing of the buffer section 20 and preventing damage to the alarm device 31. [Explanation of symbols]

[0026] 1 Safety equipment 10 Rod section 11 End rod 12 Base end rod 13 Contact end 20 Buffer 20a Warning display 30 Alarm section 31 Alarm device 31a Device body 31b Alarm button 32 Alarm Folder 32a Holding part 32b Outerwear part 40 Joint 41 Clamp 42 Connecting end A Lifting device A1 Work Deck B Obstacle

Claims

1. A safety device for a lifting work device that can raise and lower a work deck relative to a base, the safety device being installed on an upper portion of the work deck, a rod portion including a base end rod and a tip end rod connected to the base end rod so as to be freely stretched in a longitudinal direction and biased toward a tip end; a cylindrical buffer portion fitted onto at least a portion of the tip rod; An alarm unit attached to the outside of the base end rod; a joint portion connected to the base end rod and capable of being fixed to an upper portion of the work deck; The alarm unit has an alarm device that issues an alarm upon contact with a base end of the buffer unit, The buffer portion is made of a material that can be compressed and deformed in the shortening direction of the rod portion. Safety equipment.

2. the tip rod has a contact end provided at a tip of the tip rod, When the tip rod is contracted, the base end of the contact end can abut against the tip of the buffer portion.

2. The safety device of claim 1.

3. The alarm unit, An alarm folder capable of storing the alarm device is provided, The alarm holder is slidably attached to the base end rod.

2. The safety device of claim 1.

4. The joint portion is A clamp that clamps and fixes the handrail of the work deck; A connecting end that is detachably connected to the base end rod, 2. The safety device of claim 1.

5. A warning sign is attached to the outer circumferential surface of the buffer part to alert the worker.

2. The safety device of claim 1.

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