JPH0622720Y2 - Safety device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a safety device, and more particularly, to a safety device provided around an aerial work vehicle or a robot to protect a human body from danger.

[Technical Background of the Invention and Problems Thereof] Conventionally, as shown in FIG. 19, a worker 51 gets into an aerial work vehicle 50 and is connected to the work vehicle itself and the work vehicle via a boom 52. The position of the working table 53,
The height and direction may be manipulated. However, there is a serious difficulty in that the operator comes into contact with an object that is out of the field of view in the rear, side, or upper direction or cannot be seen, and is injured, seriously injured, or crushed while operating on the workbench of the work vehicle.

[Object of the Invention] The present invention has been made in view of the above-mentioned conventional problems, and an object thereof is to provide a safety device provided around an aerial work vehicle or a robot to protect a human body from danger.

[Summary of the Invention] In order to achieve such an object, a safety device of the present invention includes a coil spring having a predetermined length, a plunger fixed to a base end portion of the coil spring, and a plunger fixed with play in an axial direction. The movable bracket, an elastic member that is provided between the plunger and the movable bracket, and has strength to withstand the weight of the coil spring and the plunger, a mounting bracket that mounts the movable bracket through an elastic body, and a mounting member that faces the plunger. A switch provided on the bracket and sensitive to movement of the plunger in the axial direction.

[Embodiment of the Invention] Hereinafter, a preferred embodiment of the present invention will be described with reference to the drawings.

Referring to FIG. 1, the safety device of the present invention includes a coil spring 10 having a predetermined length. This coil spring 1
0 is, for example, spring steel with a wire diameter of 5.5 mm and is spirally wound to a length of 2
It is formed to 00 mm. The coil spring 10 has the same wire diameter and spiral pitch as shown in FIG. 6 (a), has a spiral pitch larger than the wire diameter as shown in FIG. 6 (b), and is shown in FIG. 6 (c). As shown, the mixed type can be adopted.

A plunger 12 is fixed to the base end portion 10a of the coil spring 10 inside the coil spring 10 by a lock bolt 12a. For this purpose, as shown in FIG. 6 (c), the base end portion 10a of the coil spring 10 has the same spiral pitch as the lock bolt 12a and the free end portion 10b has the same wire diameter. It is preferable to closely wind the coils so that the spiral pitches are the same, because the play is eliminated when the coil spring 10 moves.

The plunger 12 has a play in the axial direction and is also movable in the axial direction by the lock bolt 12a.
Is stuck to. For this purpose, in the embodiment, the head of the lock bolt 12a screwed to the plunger 12 is loosely attached to the long hole 11b (FIG. 2) of the movable bracket 11 and has a play of, for example, 2 mm in the axial direction.

The movable bracket 11 is integrated with a radial movable bracket 11a fixed to the movable bracket 11,
2 and the movable bracket 11a are provided with an elastic member 17 (FIG. 2) such as a disc spring.
Is strong enough to bear the weight of the coil spring 10 and the plunger 12.

The movable bracket 11a is attached to the mounting bracket 14 via a coil spring or an elastic body 13 such as rubber.
Mounted with 5. It should be noted that one of the movable bracket 11a and the mounting bracket 14 has a bolt hole larger than the bolt diameter so that the bracket 11a can be moved by the action of the plunger 12.

A switch 16 provided on the mounting bracket 14 facing the plunger 12 and sensitive to the movement of the plunger 12 in the axial direction is provided (FIG. 2). This switch 1
As shown in FIG. 3 (a), 6 is a flat braided wire 20b, c of ultrafine bundled copper wire tin plating, which is movable and fixed, on a high voltage flame-retardant silicone rubber 20a. It has a built-in structure in which a pressure conductive rubber (PCR) 20d is sandwiched. As shown in FIGS. 3 (b) and 3 (c), this is formed into a ring 20e and covered with a cover 20f. The pressurized conductive rubber 20d has both properties peculiar to an elastomer and electrical properties as a conductive material, and the resistance changes rapidly from an insulated state (several tens of MΩ) to a conductive state (several Ω) in response to a pressure stimulus. And functions as a pressure-sensitive sensor (switch). 20g is a lead wire.
As such a switch 16, for example, a multi-switch manufactured by Bridgestone Corporation, model MS55 can be adopted. The free end portion 10b of the coil spring 10 has a spindle shape, and a protective cap 18 is provided by a mounting tool 10c.

Note that if the coil spring 10 is too soft, the coil spring 10 may receive an impact when the worker 51 comes into contact with an object.
On the other hand, if it is too stiff, it is not possible to absorb the impact when the worker 51 and the object come into contact with each other. Therefore, a wire having an appropriate spring strength, for example, a moment of 4.5 kg / cm is selected.

In this way, an I type safety device as shown in FIG. 7 (a) is constructed.

Further, as another embodiment of this safety device, the bar 21 can be attached to the free end portion 10b of the coil spring 10 described above in a T-shape by the attachment tool 10c (FIG. 7 (b)). In this case, as shown in FIGS. 5 (a) and 5 (b), in the bar 21, the pipe 23 can be embedded in the rubber 22, and this can be connected by the bolt 24 of the fixture 10c.

Furthermore, as yet another embodiment of this safety device, the bar 21 can be attached to the free ends 10b and 10b of the two coil springs 10 and 10 described above by a fixture 10c in a U-shape (fourth embodiment). Fig. 7 (c)).

Another embodiment of this safety device will be explained.
In the figure, there is provided a switch 16a which is provided on the mounting bracket 14 so as to face the plunger 12 and is sensitive to the movement of the plunger 12 in the axial direction.

In FIG. 14, the switch 16a has an actuator shaft 25a formed in a conical shape, and is elastically urged by a spring 27a with respect to the receiving fitting 26a. 28a is a seal rubber. As shown in FIG. 15, the contact portion of the fixed contact 21a has a corrugated shape and is gold-plated together with the spring of the movable contact 23a. The fixed contact 21a is connected to the lead wire 30a. Such a radial sensor switch 1
6a is, for example, a tactile switch manufactured by Tateishi Electric Co., Ltd.,
Model D5B-1513 can be adopted.

Next, a case where the safety device shown in FIGS. 4 and 7C is applied to an aerial work vehicle will be described.

The safety device shown in FIG. 4 and FIG.
It is attached to the workbench 53 (FIG. 19). For this purpose, the mounting bracket 14 for the coil springs 10, 10
Is fixed to the frame 54 of the workbench 53 with appropriate attachments, bolts, etc. (FIGS. 17 and 18). Reference numeral 55 denotes a control box, in which the worker 51 is in a position where the arm 56 can climb over the bar 21 of the safety device and the hand can operate the control box 55 while standing.

The electric circuit will be described with reference to FIG. Connected to earth E via battery B, fuse, slide switch S / W, resistance r, 4 points 30a of two LS1 and LS2 representing switch 16, relay R, and 4 points 30b of LS1 and LS2. The movable and fixed contacts 20a and 20b can shunt the battery B and the ground. R1 and R2 are contacts that are simultaneously operated by the relay R. The battery B is connected to an engine stop switch S / W and a stop relay that disconnects the electrical system from the contact point R1 to the engine of the aerial work vehicle 50. Battery B is a fuse, horn S / W,
Connected to the horn relay, the contact R2 makes it possible to shunt the horn S / W.

Now, it is assumed that the worker 51 gets on the workbench 53 of the aerial work vehicle 50 (FIG. 19) and operates the work vehicle itself and the position, height, orientation, etc. of the work table 53 (FIG. 17,
(Fig. 18). If an object that is out of the field of view or cannot be seen comes into contact with the worker 51 from above during this operation, the abdomen of the worker 51 moves the elastic member 17 through the bar 21, the spring 10, the lock bolt 12 a, and the plunger 12. By pressing and pressing switch 16 (Fig. 8 Z
Direction), switch 16 (FIG. 3), ie LS1, LS2
At least one of the contacts 20a and 20b of the
Is demagnetized and the contacts R1 and R2 are rendered conductive, so that the electric system from the stop relay to the engine is disconnected to forcibly stop the engine, and the horn switch is shunted to emit an alarm sound. At this time, coil spring 1
0 and 10 absorb the impact when an object contacts the worker 51. In this case, the head portion of the lock bolt 12 a screwed to the plunger 12 has a long hole 11 b in the movable bracket 11.
Since it is loosely attached to (Fig. 2) and has a play of, for example, 2 mm in the axial direction, the Z-direction movement of the plunger 12 is immediately transmitted to the switch 16 regardless of the state of the movable bracket 11 and the movable bracket 11a.

It is to be noted that FIG. 9 is a view obtained by changing the 90 degree angle in FIG.

In this case, the base end portion 10a of the coil spring 10 is made to have a large spiral pitch, and the lock bolt 12a is provided.
Since the free end portion 10b is closely wound so that the wire diameter and the spiral pitch are the same, the play is eliminated when the coil spring 10 is moved, and the switch 16 is good for the movement of the coil spring 10. You can follow.

Further, when the worker 51 comes into contact with the worker 51 from the side, the front, or the rear, the coil spring 10 bends due to the movement of the worker 51, so that the coil spring 10 is movable against the elastic force of the elastic body 13. The bracket 11a is inclined with respect to the mounting bracket 14 (Fig. 10), and the switch 16 (Fig. 3), that is, the contacts 20a, b of the LS1, LS2.
At least one of these turns on. Similarly, the engine is forcibly stopped by disconnecting the electrical system to the engine, and the horn switch is shunted to generate an alarm sound. Also at this time, the coil springs 10 and 10 absorb the impact when an object contacts the worker 51.

Thus, in all directions (Figure 8, Figure 10, X, Y,
Even when an object comes into contact with the worker 51 from Z), the safety device senses this, and the serious risk of injury or serious injury or pressure death due to it is prevented.

The case where the safety device shown in FIGS. 4 and 7 (c) is applied to an aerial work vehicle has been described above. However, the safety device shown in FIGS. Can be combined and applied to an aerial work vehicle.
Moreover, by fixing the base end of the safety device shown in FIGS. 4 and 7 (c) to the floor and framing it around the robot,
It is possible to absorb a shock when the robot comes into contact with an operator and forcibly stop the robot to protect a human body from danger. Furthermore, the safety device shown in FIGS. 7 (a) and 7 (b) can be installed on the rear wall of the automobile garage to detect the stop position when the automobile retreats.

In addition, regarding the embodiment shown in FIG. 11 as well, FIG.
It can be used in the same way as the safety device shown in FIG.
FIG. 13 shows the functions corresponding to FIGS. 8 and 10.

Furthermore, when such a safety device is provided by connecting a plurality of devices having unspecified intervals with a square pipe or a wire, it becomes a load collapse prevention detector.

[Effects of the Invention] As is apparent from the above embodiments, according to the safety device of the present invention, the coil spring having a predetermined length, the plunger fixed to the base end portion of the coil spring, and the plunger having the axis line. A movable bracket that is fixed with play in the direction, an elastic member that is provided between the plunger and the movable bracket, and has strength to withstand the weight of the coil spring and the plunger, and a mounting bracket that mounts the movable bracket through an elastic body. Since it is equipped with a switch that is mounted on the mounting bracket facing the plunger and is sensitive to the movement of the plunger in the axial direction, it can be installed around an aerial work vehicle or robot to protect the human body from danger. There is an effect that can be done.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory view in which a coil spring and a switch used in a safety device according to the present invention are partially broken, and FIG.
The figure is a detailed explanatory view of the coil spring and the switch.
(A), (b) and (c) are detailed explanatory diagrams of the switch,
FIG. 4 is an explanatory view of a safety device according to an embodiment of the present invention in a partially broken state, and FIGS. 5 (a) and 5 (b) are explanatory views showing a connecting portion between a coil spring and a bar of the safety device, respectively. FIGS. 6 (a), 6 (b), and 6 (c) are explanatory views of the form of the coil spring, and FIGS. 7 (a), 7 (b), and 7 (c) are explanatory views showing aspects of the safety device, 8 to 10 are explanatory diagrams of the operation of the safety device, FIG. 11 is an explanatory diagram of coil springs and switches used in the safety device according to another embodiment of the present invention, and FIGS. An operation explanatory view of the safety device, FIG. 14 and FIG. 15 are explanatory views of the switch, a partial detailed explanatory view, FIG. 16 is an electric circuit diagram used for the safety device, FIG. 17 and FIG. Fig. 19 is an explanatory diagram when the safety device is applied to an aerial work vehicle, and Fig. 19 is an explanatory diagram of an aerial work vehicle. A. 10 ... Coil spring 10a ... Base end 12 ... Plunger 11, 11a ... Movable bracket 17 ... Elastic member 13 ... Elastic body 14 ... Mounting bracket 16, 16a ... Switch

Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location F16P 3/16 9030-3J

Claims (1)

[Scope of utility model registration request] 1. A movable bracket in which a coil spring (10) having a predetermined length, a plunger (12) fixed to a base end portion (10a) of the coil spring, and the plunger are fixed with play in the axial direction. (11, 11
a), an elastic member (17) provided between the plunger and the movable bracket and having a strength to withstand the weight of the coil spring and the plunger, and the movable bracket is attached via an elastic body (13). A mounting bracket (14) and a switch (16, 16a) provided on the mounting bracket facing the plunger and sensitive to movement of the plunger in the axial direction.
And a safety device.