JP5455537B2 - Safety confirmation device for aerial work platforms - Google Patents

Description

  The present invention relates to a safety confirmation device that is provided on a work platform of an aerial work vehicle and that confirms a locking state of a hook of a safety belt attached to a worker's body from the ground.

  A conventional safety confirmation device is disclosed in Patent Document 1. In this technique, a work table provided with a hook locking part is provided with a hook detection part that detects the hook locking state, and a light emitting part that emits light when the hook detection part detects hook locking is provided on the side surface of the work table. It is characterized by that. According to this technology, the person in charge of the work can visually check the hook locking state from the ground, and can alert the operator when the light emitting part is turned off (the hook is not locked). It is.

  By the way, in the above technique, depending on the brightness of the surroundings, it may be difficult to visually recognize the light emitting part, and if it is misunderstood as being lit by the influence of sunlight even if the light emitting part is turned off, it is serious. There was a risk of an accident. In addition, it is disclosed that the light emitting unit is provided at a position that is easy for the person in charge of the work to visually recognize, such as a swiveling device of a work table or a vehicle body. There was a problem of cost. Further, since the hook detection unit and the light emitting unit are separately attached, there is a problem that the hook detection unit and the light emitting unit are not suitable for retrofitting to an existing work table, and are inferior in versatility.

JP 2001-97696 A

  The problem to be solved by the present invention is to solve these conventional problems, the light emitting part showing the hook locking is excellent in visibility without being affected by the brightness of the surroundings, and to an existing work table An object of the present invention is to provide a safety confirmation device for an aerial work vehicle that can be easily retrofitted.

The configuration of the present invention that solves this problem is as follows.
1) A safety confirmation device that is provided on a work platform of an aerial work platform and that can lock a hook of a safety belt attached to a worker's body to a hook locking portion and check the locking state from the ground. A hook detection unit that detects a hook engagement state with the hook engagement unit, and a light emitting unit that irradiates or projects a downward and restricted area when the hook detection unit detects the hook engagement In addition, the hook detection unit urges the hook locked to the hook locking portion with a spring and presses it to a predetermined locking position, and moves the pressing plate to detach the hook from the hook locking portion. A contact that detects that the hook that is locked to the hook locking portion is pressed by the pressing plate by the moving position of the shaft protruding from the pressing plate and is in a predetermined locking position. Type sensor and the sensor A device for confirming safety of an aerial work vehicle, wherein the light emitting unit is activated when locking of the hook is detected. 2) Depending on whether the light emitting unit is locked or not locked The safety confirmation device for an aerial work vehicle described in 1), wherein the light emitting unit emits light in different colors according to whether the hook is locked or not locked. The safety check device for an aerial work vehicle described in 1), wherein the light emitting part is irradiated when the hook is locked, and is turned off when the hook is not locked. The high-altitude working vehicle described in 1) above, wherein the light emitting unit emits light when the hook is locked and turns off when the hook is not locked. Work vehicle safety confirmation device 6) Rear hook hook and hook detector on work bench Attached to only be casing, a light emitting unit mounted on the bottom surface of the casing, is in the 1) to 5) safety checking apparatus of Aerial according to any one.

  According to the present invention, the light emitting unit that illuminates the restricted area downwards is not easily affected by sunlight, etc. even if the surroundings are bright, such as daytime, the surroundings of the light emitting unit are shaded by backlighting. Become. Therefore, even if the person in charge looks up, it becomes easy to visually recognize the light from the light-emitting portion, and oversight of turning off or non-locking of the hook is prevented, thereby improving safety. In addition, when the light emitting unit projects light downward and in a restricted area, the person in charge of the operation can check the hooked state without looking up. Furthermore, if the light emitting unit, the hook locking unit, and the hook detecting unit are integrally configured, complicated installation work such as wiring is not required, and the device can be easily retrofitted to an existing work table and has excellent versatility. .

It is explanatory drawing of the aerial work vehicle of an Example. It is a perspective view of the safety confirmation apparatus of an Example. It is a bottom view of the safety confirmation apparatus of an Example. It is a cross-sectional view of the safety confirmation apparatus of an Example. It is a longitudinal cross-sectional view of the safety confirmation apparatus of an Example. It is sectional drawing of the monitoring lamp | ramp of an Example. It is a circuit diagram of the safety confirmation apparatus of an Example. It is explanatory drawing which shows the operating state of the safety confirmation apparatus of an Example. It is a perspective view of the safety confirmation apparatus of the other example of an Example. It is a bottom view of the safety confirmation apparatus of the other example of an Example. It is a cross-sectional view of the safety confirmation apparatus of the other example of an Example. It is a longitudinal cross-sectional view of the safety confirmation apparatus of the other example of an Example. It is a circuit diagram of the safety confirmation apparatus of the other example of an Example. It is explanatory drawing which shows the operating state of the safety confirmation apparatus of the other example of an Example. It is explanatory drawing which shows the use condition of the safety confirmation apparatus of the other example of an Example.

  As the light emitting part of the present invention, a structure in which an LED (light emitting diode), a light bulb, or the like is embedded in a socket-like object so that light is emitted from the opening in one direction within a predetermined area (for example, a downlight). (A simple structure) is used. Further, it is possible to use a projector (projector) that uses a reflecting mirror or a lens to obtain a high luminous intensity in one direction. The restricted area to be irradiated or projected is a range in which the person in charge on the ground can visually recognize the position below the workbench, and is approximately 2 to 4 times the outer diameter of the workbench (about 4 to 16 times the area). Is practical.

  The light emitting unit may be pivotally supported so that the direction of irradiation or projection can be adjusted. Alternatively, the light emitting unit may be suspended so that the light emitting unit can always irradiate or project light in the vertical direction even when the work table is inclined. The light emitting unit may emit light so that the locked and unlocked states of the hook can be identified by different colors. For example, if the light is emitted in blue when the hook is locked and light is emitted in red when the hook is not locked, the worker in charge can recognize the danger more strongly, and safety is further improved. The light emitting unit may be turned on or blinked, or a rotating lamp that can irradiate or project light within a limited area may be used. The projection may be performed so that the area is uniformly projected, or the projection parts are scattered, and the position of the spot-like projection parts is changed within the projection area. May shine. The light emitting unit may combine the irradiated part and the light projecting part so that it can be switched according to day and night.

  The hook detection unit includes a mechanical detection unit, a proximity detection unit, and an electrical detection unit. In particular, a hook that is locked to the hook locking unit is biased by a spring so that a predetermined locking is achieved. A pressing plate that presses against the position, and a contact-type sensor that detects that the hook locked to the hook locking portion is pressed by the pressing plate according to the moving position of the shaft protruding from the pressing plate and is in a predetermined locking position. It is preferable that the hook is securely detected and the durability is excellent.

  The safety confirmation device shall be a low-cost and highly versatile device if the hook engaging part, hook detecting part and light emitting part are integrally formed with a casing so that it can be easily retrofitted to an existing work table. Can do. As the mounting position, it is preferable that the mounting is performed so as to project to the side position of the workbench because the operator can easily hook the hook and the person in charge on the ground can easily see the light of the light emitting unit.

  Embodiments of the present invention will be specifically described below with reference to the drawings. 1 is an explanatory diagram of an aerial work vehicle according to the embodiment, FIG. 2 is a perspective view of the safety confirmation device according to the embodiment, FIG. 3 is a bottom view of the safety confirmation device according to the embodiment, and FIG. FIG. 5 is a longitudinal sectional view of the safety confirmation device of the embodiment, FIG. 6 is a sectional view of the monitoring lamp of the embodiment, FIG. 7 is a circuit diagram of the safety confirmation device of the embodiment, and FIG. It is explanatory drawing which shows the operation state of a confirmation apparatus.

  In the figure, 10 is an aerial work vehicle, 11 is a vehicle body, 12 is an outrigger, 13 is a turning device, 14 is a boom, 15 is a work table, 15a is a fixing bracket, 20 is a safety belt, 21 is an auxiliary rope, 22 is Hook, 30 is a safety confirmation device, 31 is a casing, 31a is a fixing piece, 31b is a fixing bolt, 32 is a locking rod (hook locking portion), 33 is a pressing plate, 33a is a support shaft, 33b is a shaft, 34 is Spring, 35 lever, 36 rotary switch (sensor), 36a switch section, 37 power lamp, 38 red monitor lamp (light emitting section), 38a LED, 38b socket, 38c lens, 39 blue Monitoring lamp (light emitting unit), 40 is a power source, 41 is a power switch, H is a person in charge of work, and h is a worker.

  As shown in FIG. 1, the aerial work vehicle 10 of the present embodiment is provided with an outrigger 12 on the side of the vehicle body 11 that is grounded and stabilizes the vehicle body 11, and is expanded and contracted and raised by hydraulic pressure via a turning device 13. A moving boom 14 is provided at the rear of the vehicle body 11, a work table 15 is provided at the tip of the boom 14, and a safety confirmation device 30 is attached to a side of the work table 15.

  As shown in FIGS. 2 to 5, the safety confirmation device 30 has a locking bar 32 and a support shaft 33 a horizontally mounted in a recess of the casing 31, and can freely advance and retreat through the shaft 33 b in and out of the casing 31. The contact plate 33c is obliquely fixed to the inner end of the shaft 33b, and the pressing plate 33 is fixed to the intermediate portion of the shaft 33b. A spring 34 is supported by a support shaft 33a between the pressing plate 33 and the inner surface of the casing 31, and a lever 35 is fixed to the outer end of the shaft 33b. A fixing piece 31a is formed on the lower surface of the casing 31, and is attached to the work table 15 with a fixing bolt 31b via a fixing bracket 15a.

  With these configurations, the pressing plate 33 is normally pressed against the casing 31 by the bias of the spring 34 to close the recess of the casing 31, and when the lever 35 is pulled, the pressing plate 33 is separated from the casing 31 and the recess is opened. When the hand is released, the pressing plate 33 is pressed again against the casing 31 by the bias of the spring 34 so that the recess is closed.

  A rotary switch 36 is mounted in the casing 31, and the contact plate 33c of the shaft 33b is brought into contact with the switch portion 36a of the rotary switch 36, and the contact plate 33c moves the switch portion 36a by the movement of the shaft 33b. A power lamp 37 for displaying energization to the safety confirmation device 30 is attached to the side surface of the casing 31, and a red monitoring lamp 38 and a blue monitoring lamp 39 are attached to the lower surface of the casing 31.

  As shown in FIG. 6, the red monitoring lamp 38 has an opening in the lower surface of the casing 31, a socket 38b is attached to the opening, a plurality of LEDs 38a are embedded in the socket 38b, and the opening of the socket 38b is closed with a lens 38c. doing. With this configuration, the light of the LED 38a is emitted within a predetermined area in one direction from the opening of the socket 38b. The blue monitor lamp 39 has the same structure except for the emission color of the LED 38a.

  As shown in FIG. 7, the rotary switch 36 is connected to a power lamp 37, a red monitoring lamp 38, a blue monitoring lamp 39, a power supply 40 (such as a battery of the vehicle body 11), and a power switch 41. When the power switch 41 is turned on, the power lamp 37 is lit. When the switch portion 36a is in the position A (the pressing plate 33 is in contact with the casing 31), the red monitoring lamp 38 is lit and the blue monitoring is performed. When the lamp 39 is turned off and the switch portion 36a is in the position B (the pressing plate 33 is away from the casing 31), the red monitoring lamp 38 is turned off and the blue monitoring lamp 39 is turned on. Yes. The power switch 41 is provided in the driver's seat of the aerial work vehicle 10.

  The rotary switch 36 is arranged so that the blue monitoring lamp 39 is lit when the gap between the pressing plate 33 and the casing 31 is narrower than the width of the hook 22 or more. Yes.

  With these configurations, when the power switch 41 is turned on, the power lamp 37 and the red monitoring lamp 38 are turned on, and when the lever 35 is pulled to release the pressing plate 33 from the casing 31, the red monitoring lamp 38 is turned off and the blue monitoring lamp 38 is turned off. The monitoring lamp 39 is turned on. The lighting of the red monitoring lamp 38 indicates that the hook 22 is not locked, and the lighting of the blue monitoring lamp 39 indicates that the hook 22 is locked.

  Hereinafter, a method of using the safety confirmation device 30 will be described. When the work manager H or the worker h turns on the power switch 41, as shown in FIG. 8A, the power lamp 37 and the red monitoring lamp 38 of the safety check device 30 are turned on. The person in charge H confirms that the power lamp 37 is turned on and confirms that the safety confirmation device 30 is operating.

  When the worker h wears the safety belt 20 and gets on the work table 15 and pulls the lever 35 to release the pressing plate 33 from the casing 31, the red monitoring lamp 38 is turned off as shown in FIG. The blue monitoring lamp 39 is turned on. In this state, the hook 22 is locked to the locking bar 32, the lever 35 is released, and the hook 22 is pressed against the casing 31 by the pressing plate 33. The blue monitoring lamp 39 continues to be lit as shown in FIG.

  Note that the order of operation of the power switch 41 and the locking of the hook 22 may be reversed. When the power switch 41 is turned on after the hook 22 is first locked, the power lamp 37 and the blue monitoring lamp 39 are turned on simultaneously.

  The worker h operates the control panel (not shown) to operate the turning device 13 and the boom 14, and as shown in FIG. 1, the work table 15 is raised to a predetermined height to start work. The person in charge H on the ground looks up and visually recognizes the lighting of the blue monitoring lamp 39 to confirm that the worker h is moored on the work table 15. If the worker h intentionally removes the hook 22 or the hook 22 is removed during the work, the pressing plate 33 returns to the original position and the blue monitoring lamp 39 is turned off and the red monitoring lamp is turned off. 38 lights up. The person in charge H who sees the lighting of the red monitoring lamp 38 alerts the worker h and locks the hook 22.

  In daytime work, the surroundings of the red monitoring lamp 38 and the blue monitoring lamp 39 are shaded by backlight, so even if the person in charge H looks up, the light of the red monitoring lamp 38 and the blue monitoring lamp 39 remains. It is sufficiently visible and safety can be ensured by preventing the red monitoring lamp 38 from being overlooked. Further, since the safety confirmation device 30 is integrally formed with the casing 31 together with the red monitoring lamp 38 and the blue monitoring lamp 39, it can be easily retrofitted to the existing work table 15, and complicated installation such as routing of wiring is performed. Work is unnecessary and it becomes excellent in versatility.

  FIGS. 9 to 14 show other examples of the safety confirmation device of the embodiment. 9 is a perspective view of another example of the safety confirmation device of the embodiment, FIG. 10 is a bottom view of the safety confirmation device of the other example of the embodiment, and FIG. 11 is a cross section of the safety confirmation device of the other example of the embodiment. FIG. 12, FIG. 12 is a longitudinal sectional view of a safety confirmation device of another example of the embodiment, FIG. 13 is a circuit diagram of a safety confirmation device of another example of the embodiment, and FIG. 14 is a safety confirmation device of another example of the embodiment. It is explanatory drawing which shows the operating state of. In the figure, 15b is a protrusion, and 35a is a roller.

  In this example, as shown in FIGS. 9 to 12, the fixing piece 31 a is formed on the back surface of the casing 31 and is directly attached to the protrusion 15 b of the work table 15 with the fixing bolt 31 b. The pressing plate 33 is bent so as to be movable along the two support shafts 33a. The lever 35 penetrates into and out of the casing 31 and pivotally supports the intermediate portion. A roller 35a is pivotally supported at the tip of the lever 35 so as to contact the pressing plate 33, and the pressing plate 33 can be moved by tilting the lever 35. It has become. The roller 35 a is provided to reduce friction caused between the roller 35 a and the pressing plate 33 when the lever 35 is moved by rotation and to lighten the operational feeling of the lever 35.

  The red monitoring lamp 38 is omitted, and the blue monitoring lamp 39 is turned on and off to indicate the locking state of the hook 22. As shown in FIG. 13, when the power switch 41 is turned on, the power lamp 37 is lit, and when the switch portion 36a is in the position A (the pressing plate 33 is in contact with the casing 31), the blue monitor lamp 39 is turned on. Is turned off, and the blue monitor lamp 39 is turned on when the switch portion 36a is in the B position (the pressing plate 33 is away from the casing 31). When the blue monitoring lamp 39 is turned off, the hook 22 is not locked, and when it is lit, the hook 22 is locked.

  With these configurations, when the power switch 41 is turned on, as shown in FIG. 14A, the power lamp 37 is turned on (the blue monitoring lamp 39 remains off), the lever 35 is tilted, and the pressing plate 33 is moved to the casing. As shown in FIG. 14 (b), the blue monitoring lamp 39 is turned on, and as shown in FIG. 14 (c), the hook 22 is locked to the locking bar 32 and the pressing plate 33 is used to move the casing. When pressed against 31, the blue monitoring lamp 39 continues to be lit. In other respects, the reference numeral, the configuration, and the operational effects are the same as in the embodiment.

  FIG. 15 shows another example of the safety confirmation device of the embodiment. FIG. 15 is an explanatory diagram illustrating a usage state of another example of the safety check device according to the embodiment. In the figure, 50 is a projector. In this example, as shown in FIG. 15, a projector 50 is used instead of the monitoring lamps 38 and 39 of the embodiment.

  The floodlight 50 has a central floodlight portion that allows the person in charge H to visually recognize the locked state of the hook 22 and a surrounding floodlight portion that allows a pedestrian to visually recognize the danger of a fallen object or the like. ing. The light is projected in a circular shape on the ground, the central light projecting area is projected in red or blue according to the locking state of the hook 22, and the surrounding light projecting area always has a color that recognizes danger (red or yellow). It is supposed to be flooded. The surrounding light projection area may be projected so that characters (for example, “no entry”) appear.

  With this configuration, the person in charge H can check the locked state of the hook 22 without looking up, and can make the pedestrian recognize that the work is being performed above the light projection area. This example is useful at night and can take measures not only for the safety of the worker h during work but also for the safety of pedestrians. In other respects, the reference numeral, the configuration, and the operational effects are the same as in the embodiment.

  The technology of the present invention is used for an aerial work vehicle used for workers to work at a high place such as wiring work of electric wires and communication lines, installation work of traffic lights and street lamps, and pruning work of tall trees.

DESCRIPTION OF SYMBOLS 10 High-altitude work vehicle 11 Car body 12 Outrigger 13 Turning apparatus 14 Boom 15 Worktable 15a Fixing bracket 15b Protrusion 20 Safety belt 21 Auxiliary rope 22 Hook 30 Safety confirmation device 31 Casing 31a Fixing piece 31b Fixing bolt 32 Locking rod 33 Pushing plate 33a Support shaft 33b Shaft 33c Catch plate 34 Spring 35 Lever 35a Roller 36 Rotary switch 36a Switch part 37 Power lamp 38 Red monitor lamp 38a LED
38b socket 38c lens 39 blue monitor lamp 40 power supply 41 power switch 50 projector H worker in charge h worker

Claims (6)

A safety confirmation device that is provided on a work platform of an aerial work platform and that can lock a hook of a safety belt attached to a worker's body to a hook locking portion and check the locking state from the ground. A hook detection unit that detects the hook engagement state with the engagement portion, and a light emitting unit that irradiates or projects a downward and restricted area when the hook detection unit detects the hook engagement , In addition, the hook detection unit urges the hook locked to the hook locking portion with a spring and presses it to a predetermined locking position, and a gap for moving the pressing plate to detach the hook from the hook locking portion. And a contact type that detects that the hook locked to the hook locking portion is pressed by the pressing plate by the moving position of the shaft protruding from the pressing plate and is in a predetermined locking position. Sensor and the sensor Characterized in that the detecting the locking of those which is adapted to operate the light emitting unit, safety checking apparatus of aerial platforms.   The safety confirmation device for an aerial work vehicle according to claim 1, wherein the light emitting unit emits light in different colors depending on whether the hook is locked or not.   The safety confirmation device for an aerial work vehicle according to claim 1, wherein the light emitting unit emits light in different colors depending on whether the hook is locked or not.   The safety confirmation device for an aerial work vehicle according to claim 1, wherein the light emitting portion is irradiated when the hook is locked and is turned off when the hook is not locked.   The safety confirmation device for an aerial work vehicle according to claim 1, wherein the light emitting unit projects light when the hook is locked and turns off when the hook is not locked. The safety confirmation device for an aerial work vehicle according to any one of claims 1 to 5, wherein the hook engaging portion and the hook detecting portion are attached to a casing that can be retrofitted to the work table, and the light emitting portion is attached to a lower surface of the casing.

Images