JPH0622719Y2 - 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. 11, an operator 51 boarded an aerial work vehicle 50 and was 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 is provided with a coil spring of a predetermined length and a radial sensor built in the coil spring along the axial direction thereof. The contact body having a dimension larger than the spiral pitch, the actuator connected to the contact body, the movable contact connected to the actuator and moving in the axial direction by the swinging of the actuator in the radial direction, and the contact separation from the movable contact. It has a fixed contact for carrying out, and the base end of the radial sensor is attached to the base end of the coil spring.

Further, in this safety device, a line sensor including a fixed contact having a predetermined length and a movable contact facing the fixed contact and contacting with and separating from the fixed contact can be attached orthogonally to the free end of the coil spring.

Further, in this safety device, a line sensor including a fixed contact of a predetermined length and a movable contact that faces the fixed contact and contacts and separates from the fixed contact can be mounted between the free ends of the two coil springs. .

[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. 4 (a), the spiral pitch larger than the wire diameter as shown in FIG. 4 (b), and FIG. 4 (c). As shown, the mixed type can be adopted.

A mounting bracket 12 is provided on the base end 11 of the coil spring 10 and a protective cap 14 is provided on the free end 13.

The radial sensor 20 is built in the coil spring 10 along its axial direction.

This radial sensor 20, as shown in FIG. 2A,
A contact body 24 having a size larger than the spiral pitch of the coil spring 10, an actuator 22 connected to the contact body 24, and a movable contact 23 connected to the actuator 22 and moving in the axial direction by the radial movement of the actuator. , And a fixed contact 21 that makes contact with and separates from the movable contact.

The shape of the contact body 24 is spherical as shown in FIG.
A cylindrical type as shown in FIG. 5 (b) and an elliptic spherical type as shown in FIG. 5 (c) can be adopted.

In the radial sensor 20, the actuator shaft 25 of the actuator 22 has a conical head portion 25a. A shaft body in which a large-diameter shaft portion 25b, an intermediate shaft portion 25c, and a small-diameter shaft portion 25b are integrally formed in the axial direction is formed, and a head is formed by a spring 27 wound around the intermediate shaft portion 25c. The portion 25a is in contact with the large-diameter shaft portion 25b, and the conical head portion 25a is resiliently attached to the receiving metal fitting 26. As a result, the head portion 25a of the actuator shaft 25 itself becomes the spring 27.
It is repulsed by and is swingable in the receiving metal fitting 26 in the radial direction. An inner tubular portion 26b is mounted on the tubular portion 26a of the receiving metal fitting 26. 28 is a seal rubber, and 29 is a connector of the actuator 22 and the contact body 24.

The pair of fixed contacts 21, 21 extends in the inner cylinder portion 26b in the axial direction, is bent radially inward in front of the top of the inner cylinder portion 26b, and is arranged so as to be opposed to each other (FIGS. 2A and 2B). Figure).

The movable contact 23 is formed of a spring and has a pair of fixed contacts 21,
A small-diameter shaft portion 25c, which is housed in an insulating tubular portion 23a disposed inside 21, and which normally penetrates the top portion of the inner tubular portion 26b.
And the insulating cylindrical stepped portion 23b. Second B
As shown in the figure, the contact portion of the fixed contact 21 has a wavy shape, and the spring of the movable contact 23 is gold-plated. The fixed contact 21 is connected to the lead wire 30.

In the normal state shown in the figure, the spring of the movable contact 23 is a small-diameter shaft portion 25.
Since it is repelled between c and the insulating cylindrical step portion 23b,
The movable contact 23 is bridged between the pair of fixed contacts 21 and 21 and is in a normal state of switch ON.

On the other hand, when the coil spring 10 is bent by the movement of the operator, the contact body 24 is also moved in the radial direction in the radial sensor 20, and the head portion 25a of the actuator shaft 25 itself is moved by the swinging of the actuator 22 in the radial direction. The spring 27 oscillates under the elastic force of the receiving metal fitting 26, and thus the large-diameter shaft portion 25b, the intermediate shaft portion 25c, and the small-diameter shaft portion 25d.
And move in the axial direction, the movable contact 23 descends against the spring, and the movable contact 23 separates from the fixed contact 21. Therefore, the switch is turned off. As such a radial sensor 20, for example, a tactile switch manufactured by Tateishi Electric Co., Ltd., Model D5B-1513 can be adopted.

The base end portion 31 of the radial sensor 20 is a bolt 32,
By the washer 33, the base end portion 11 of the coil spring 10
It is attached to the mounting bracket 12 of.

If the coil spring 10 is too soft, the radial sensor 20 will be activated by the vibration of the surrounding machine,
On the contrary, if it is too stiff, the radial sensor 20 will not operate, so an appropriate spring strength, for example, a moment of 4.5.
A wire rod of kg / cm is selected.

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

As another embodiment of this safety device, as shown in FIG. 6, a fixed contact 40 of a predetermined length made of a conductive plate of, for example, a copper-plated steel plate and a fixed contact 40 made of a conductive plate of, for example, phosphor bronze, are opposed to the fixed contact 40. A line sensor 42 including a movable contact 41 that contacts and separates from the fixed contact 40 is provided. The line sensor 42 is, for example, 600 to 800 mm.
In the figure, 43 is an insulating material made of polyester that separates the fixed contact 40 and the movable contact 41 from each other, 44 is a backup plate of the fixed contact 40, 45 is an insulating material made of polyester, and 46.
Is a vinyl coating material and has a pressing portion 47. The line sensor 42 is the free end portion 13 of the coil spring 10.
It is attached orthogonally to (FIG. 7 (b)). The sixth
In the figure, the line sensor 42 is shown in cross section,
As shown in FIG. 3, it extends for a predetermined length in the thickness direction of the paper in the drawing. As such a line sensor 42, for example, a 141BPH type tape switch manufactured by Tokyo Sensor Co., Ltd. can be adopted.

Further, as still another embodiment of this safety device, the line sensor 42 is attached between the free ends 13 and 13 of the two coil springs 10 and 10 (FIGS. 3 and 7 (c)).

Next, a case where the safety device shown in FIGS. 3 and 7 (c) is applied to an aerial work vehicle will be described.

The safety device shown in FIG. 3 and FIG.
It is attached to the workbench 53 (FIG. 11). To this end, the base ends 11 of the coil springs 10 and 10 are fixed to the frame 54 of the workbench 53 by the mounting bracket 12 (FIGS. 9 and 10). Reference numeral 55 denotes a control box in which the operator 51 is in a position in which the arm 56 can get over the line sensor 42 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. Line sensor 42, contacts 21, 23, 40, 4 of radial sensors 20, 20 built into the coil spring 10.
1 is connected from the battery B to the relays R1 and R2, respectively. Ry1 and Ry2 are the contact points. The contact point Ry1 from the battery B is connected to a stop relay that disconnects the electric system from the aerial work vehicle 50 to the engine, and the contact point Ry2 is connected to the relay R1.

Now, it is assumed that the worker 51 gets on the workbench 53 of the aerial work vehicle 50 (FIG. 11) and operates the work vehicle itself and the position, height, orientation, etc. of the work table 53 (10th embodiment).
Figure). If an object outside the field of view or invisible to the worker 51 comes into contact with the worker 51 from the rear during this operation, the movable contact 41 of the line sensor 42 has a pressing portion 47 on the abdomen of the worker 51.
Fixed contact 40 by pushing (X direction in Fig. 3)
, The relay R1 is turned on, the contact Ry1 is opened, 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, the coil springs 10 and 10 absorb the impact when an object contacts the worker 51.

When an object outside the field of view or invisible contacts the worker 51 from behind, or when an object outside the field of view or invisible contacts the worker 51 from the side, above, or below, the coil Since the spring 10 is bent by the movement of the worker 51, the radial sensor 2
At 0, the contact body 24 is also moved in the radial direction, and the head portion 25a of the actuator shaft 25 itself swings in the receiving metal fitting 26 under the elastic force of the spring 27 due to the swinging of the actuator 22 in the radial direction. 25b and the intermediate shaft portion 25
c and the small-diameter shaft portion 25d move in the axial direction, the movable contact 23 descends against the spring, and the movable contact 23 separates from the fixed contact 21. Therefore, the relay R2 is turned off,
Contact Ry2 is closed, relay R1 is turned on, contact Ry
1 is opened, 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. Also at this time, the coil springs 10 and 10 absorb the impact when an object contacts the worker 51. In this case, since the contact body 24 has a size larger than the spiral pitch of the coil spring 10, the contact body 24 does not enter between the lines when the coil spring 10 is bent, and can follow the movement of the coil spring 10 well. it can.

In this way, even when an object comes into contact with the worker 51 from any direction (Y in FIG. 7 (C)), the safety device senses this and there is no serious risk of injury or serious injury or pressure death. To be prevented.

The case where the safety device shown in FIGS. 3 and 7 (c) is applied to an aerial work vehicle has been described above, but the safety device shown in FIGS. 7 (a) and 7 (b) as it is or Can be combined and applied to an aerial work vehicle.
Further, by fixing the base end of the safety device shown in FIGS. 3 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.

[Effects of the Invention] As is apparent from the above embodiments, according to the safety device of the present invention, the coil spring having the predetermined length and the radial sensor built in the coil spring along the axial direction thereof are provided, The radial sensor includes a contact body having a size larger than the spiral pitch of the coil spring, an actuator connected to the contact body, a movable contact and a movable contact connected to the actuator and moving in the axial direction by the radial movement of the actuator. It has a fixed contact for contact with and separates from the radial sensor, and by attaching the base end of the radial sensor to the base end of the coil spring, 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.

In addition to the above safety device, a fixed contact of a predetermined length,
A line sensor consisting of a movable contact that faces the fixed contact and separates from the fixed contact is attached orthogonally to the free end of the coil spring, or a fixed contact of a predetermined length and a fixed contact that faces the fixed contact. By installing a line sensor consisting of a movable contact for contact and separation between the free ends of the two coil springs, the safety device detects this when an object comes into contact with the worker from any direction, The serious risk of injury or serious injury or crushing resulting from it is prevented.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a partially broken state of a coil spring and a radial sensor used in a safety device according to the present invention, FIGS. 2A and 2B are detailed explanatory views of the radial sensor, and FIG. 3 is the present invention. Explanatory drawing in the state where the safety device according to one embodiment is partially broken, FIG.
(C) is an explanatory view of the form of the coil spring, FIGS. 5 (a), (b), and (c) are explanatory views of the form of the contact body used in the radial sensor, and FIG. 6 is a view of the safety device according to the present invention. Detailed explanatory view of the line sensor used, FIGS. 7 (a), (b), and (c) are explanatory views showing an aspect of the safety device, and FIG. 8 is an electric circuit diagram used in the safety device, FIG.
FIG. 10 and FIG. 10 are explanatory views when the safety device is applied to an aerial work vehicle, and FIG. 11 is an explanatory view of an aerial work vehicle. 10 ...... Coil spring 11 ...... Base end 13 ...... Free end 20 ...... Radial sensor 21 ...... Fixed contact 22 ...... Actuator 23 ...... Movable contact 24 ...... Contact body 31 ...... Base end 40 ...... Fixed contact 41 …… Moveable contact 42 …… Line sensor

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

Claims (3)

[Scope of utility model registration request] 1. A coil spring (10) having a predetermined length and a radial sensor (20) built in the coil spring along the axial direction thereof are provided, and the radial sensor has a spiral pitch larger than a spiral pitch of the coil spring. A contact body (24) having a large size, an actuator (22) connected to the contact body, and the actuator (2)
2) which has a movable contact (23) which is connected to 2) and moves in the axial direction by the radial swing of the actuator, and a fixed contact (21) which makes contact with and separates from the movable contact. A safety device comprising an end portion (31) attached to a base end portion (11) of the coil spring. 2. A fixed contact (40) having a predetermined length, and a movable contact (4) facing the fixed contact and making contact with and separated from the fixed contact.
A utility model registration claim 1 characterized in that a line sensor (42) consisting of (1) and (2) is provided, and the line sensor is mounted orthogonally to the free end (13) of the coil spring (10). The described safety device. 3. A fixed contact (40) having a predetermined length, and a movable contact (4) facing the fixed contact and contacting with and separating from the fixed contact.
1) is provided, and the line sensor is connected to the two coil springs (10, 1).
The safety device according to claim 1, wherein the safety device is mounted between the free ends (13, 13) of (0).