HK1118746B - Harness type safety belt - Google Patents

Description

Harness type safety belt

Technical Field

The present invention relates to a harness type safety belt used mainly in high-level work places such as construction sites.

Background

In general, when a worker works at a high place such as a construction site, the worker is obliged to wear a safety belt for preventing rolling. Such a seat belt is generally composed of a trunk belt to be worn on the trunk of a human body and a predetermined length of rope connected to the trunk belt, and a fixing hook attached to the tip of the rope is hooked on a main rope or the like at a work site.

However, since the seat belt is worn on the body of the human body, the tension of the cord is concentrated on the body, and the suspended posture is liable to be unstable. Therefore, a so-called sling type safety belt is known which includes belts extending not only in the trunk of the human body but also in both shoulders, back and thighs, and which stably supports the human body by connecting a strap to the belt on the back and dispersing the tension of the strap acting on the human body through the belts (see, for example, patent document 1).

Even when the above-described seat belt is used, if a person forgets to hook the seat belt to the main rope or the like, or if the hook is replaced, the person may accidentally fall, and safety measures cannot be taken without fail. As an impact absorption aid for absorbing a falling impact at the time of falling, there is a falling impact absorption aid including a wearing body to be worn on a human body; an air bag provided on the wearing body corresponding to a predetermined part of the human body; an inflation mechanism that inflates the airbag by the inflation mechanism if a fall of a human body is detected (for example, see patent document 2).

However, in the above-described drop impact absorption aid, since the wearing body having the plurality of air bags is in the form of a jacket, if the harness type seat belt is attached to the wearing body, the expansion of the air bags is hindered by the body of the seat belt, and in the case where the wearing body is attached to the harness type seat belt, there is a problem that the rope connecting portion provided on the back portion of the seat belt is covered with the wearing body and cannot be connected to the rope, and it is difficult to use the drop impact absorption aid and the harness type seat belt at the same time.

Patent document 2: JP Kokai No. 11-333013

Patent document 1: JP Kokai No. 7-96049

Disclosure of Invention

The present invention has been made in view of the above problems, and an object of the present invention is to provide a harness type safety belt capable of absorbing a drop impact on a user even when the user accidentally falls from a high place.

In order to achieve the above object, a harness type seatbelt of the present invention includes: a pair of shoulder belts, which are crossed on the back of the human body and hung on the two shoulders; a pair of ring-shaped thigh belts into which the two thighs of the human body are inserted, respectively; a waist belt disposed on a waist of a human body; a connecting portion which connects the string to the crossing portion of each shoulder belt, characterized by further comprising: an air bag provided at a predetermined position of the belt; an inflation mechanism for inflating the airbag; a fall detection mechanism that detects a fall of a human body; and a control mechanism which inflates the air bag when the falling of the human body is detected by the falling detection mechanism. Thus, when the user accidentally falls from a high position, the air bag provided on the wearable body inflates, and the falling impact can be absorbed by the air bag. In addition, when the user is suspended by the string connected to the connection portion, the body of the user is supported not only by the waist belt but also by the shoulder belts and the thigh belts, and thus the tension of the string acting on the human body is distributed to the belts and the human body is stably supported.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the harness type safety belt of the present invention, when a user rolls down from a high position, for example, in a case where the user forgets to hook the safety belt to the safety rope, the drop impact applied to the user can be reduced by absorbing the drop impact with the air bag. In addition, when the user hangs by a string, the body of the user can be supported not only by the waist belt of the wearing belt but also by the shoulder belts and the thigh belts, so that the tension of the string acting on the human body can be distributed to the belts and the human body can be stably supported.

Description of the drawings:

FIG. 1 is a front view of a harness type safety belt illustrating one embodiment of the present invention;

FIG. 2 is a rear view of the harness type seat belt;

FIG. 3 is a front view showing an inflated state of the airbag;

FIG. 4 is a rear view showing an inflated state of the air bag;

FIG. 5 is a left side view showing an inflated state of the air bag;

FIG. 6 is a right side view showing an inflated state of the air bag;

FIG. 7 is a block diagram showing a control system;

FIG. 8 is a front view showing the interior of the sensor assembly;

FIG. 9 is a side cross-sectional view of a drop sensor and an acceleration sensor;

FIG. 10 is a sectional view taken along line A-A of FIG. 9 in the viewing direction;

FIG. 11 is a flowchart showing the operation of the control unit;

FIG. 12 is a front view showing a contracted state of the air bag when worn;

FIG. 13 is a rear view showing a contracted state of the air bag when worn;

FIG. 14 is a front view showing an inflated state of the air bag when worn;

fig. 15 is a rear view showing an inflated state of the airbag when worn.

Description of reference numerals:

1 wearing a belt body; 1a shoulder strap; 1b thigh straps;

1c a waist band; 1e connecting rings; 1g front buckle;

1h, switching; 2, air bag; 2a 1 st air bag part;

2b the 2 nd air bag part; 3 an inflator; 4 drop sensor;

5 an acceleration sensor; 6 a control part.

Detailed Description

Fig. 1 to 15 show an embodiment of the present invention.

The harness type seat belt of the present embodiment is composed of a wearing body 1 to be worn on a human body, an air bag 2 provided on the wearing body 1, an inflator 3 for inflating the air bag 2, a plurality of drop sensors 4 for detecting a drop of the human body, an acceleration sensor 5 for detecting an acceleration generated in the vertical direction on the human body, and a control unit 6, wherein the control unit 6 operates the inflator 3 based on detection signals of the drop sensors 4 and the acceleration sensor 5, and the drop sensors 4 and the acceleration sensor 5 constitute a drop detection means.

The wearing body 1 includes: a pair of shoulder belts 1a, the pair of shoulder belts 1a crossing at the back of the human body and hanging on the two shoulders; a pair of thigh straps 1b into which the two thighs of the human body are inserted, respectively; a waist belt 1c provided on the waist of the human body; a chest strap 1d is placed in front of the chest of a human body, and a connection ring 1e to which a cord not shown in the drawing can be connected is attached to the crossing portion of each shoulder strap 1 a. One end of each shoulder belt 1a is connected to a side portion of the waist belt 1c, and the other end crosses the back surface side and is connected to a side portion of the waist belt 1 c. Further, a back buckle 1f is attached to the intersection of each shoulder belt 1 a. Each thigh belt 1b is endless, and the tip end thereof is connected to the side of the waist belt 1 c. The waist belt 1c includes a front buckle 1g having a known structure in which both ends are detachably connected to the front surface side, and a switch 1h is provided inside the front buckle 1g, and the switch 1h is opened and closed in conjunction with connection and disconnection of the front buckle 1 g. The chest belt 1d is provided above the waist belt 1c, and both ends thereof are connected to the front side of each shoulder belt 1 a.

The airbag 2 is formed of a base material having high airtightness and high durability, for example, Vectran (wholly aromatic polyester), and the base material of the material is made into an airbag shape by sewing or heat welding. That is, the bag 2 is formed of a 1 st bag portion 2a and a 2 nd bag portion 2b, the 1 st bag portion 2a is formed so as to extend from the back of the human body to the front side through both shoulders, the 2 nd bag portion 2b is formed so as to cover the back side of the waist of the human body, and the bag portions 2a and 2b communicate with each other through a communication portion 2c extending from one end of the 1 st bag portion 2a to the side of the 2 nd bag portion 2 b. Namely, the bag 2 is formed as follows: the portion of the 1 st air bag portion 2a corresponding to the back of the human body is located above the connection ring 1e, and the portion of the 2 nd air bag portion 2b corresponding to the back of the human body is located below the connection ring 1 e.

The inflator 3 is formed of a known structure that discharges a compressed fluid sealed in, for example, a bottle by the explosion of gunpowder, and is connected to the communication portion 2c of the gas bag 2.

Each drop sensor 4 is composed of a container 10 having a cylindrical shape, a fixed contact 11 provided on the inner peripheral surface of the container 10, a plurality of elastically deformable movable contacts 12 provided at intervals in the circumferential direction of the inside of the container 10, and an inertial body 13 that elastically deforms the movable contacts 12 to come into contact with the fixed contacts 11.

The container 10 is formed of a conductive metal bottomed tubular member, and one end opening portion thereof is closed by a conductive lid plate 10 a. Further, the cover plate 10a is attached with a rod-shaped conductive terminal 10b through an insulating member 10c such as glass so as to penetrate into the container 10.

The fixed contact 11 is formed by an inner peripheral surface of the container 10, and a plurality of protruding portions 11a are formed on the peripheral surface so as to partially protrude the container 10 inward, and the plurality of protruding portions 11a are provided so as to extend in the axial direction of the container 10 at intervals in the circumferential direction.

The movable contacts 12 are formed of a conductive thin metal plate extending in the axial direction of the container 10, and are provided at intervals in the circumferential direction of the container 10. One end side of each movable contact 12 is fixed so as to be sandwiched between conductive metal plates 12a and insulating members 12b made of synthetic resin, and is electrically connected to the conductive terminals 10b, the metal plates 12a are fixed by welding to end faces of the conductive terminals 10b, and the insulating members 12b are provided on the cover plate 10a side.

The inertial body 13 is formed of a metal sphere accommodated in the container 10, and is provided inside each movable contact 12 so as to be movable.

In the drop sensor 4, in a state where gravity acts in a direction perpendicular to the axis of the container 10 (radial direction of the container 10), the movable contact 12 below the inertial body 13 is elastically deformed by the self weight of the inertial body 13, pressed against the fixed contact 11, and conducted to the fixed contact 11. Further, if the drop sensor 4 is in a dropped state, the apparent weight of the inertial body 13 is reduced, and therefore the movable contact 12, which is deflected toward the fixed contact 11 by the inertial body 13, presses the inertial body 13 back to the middle side of the container 10 and separates from the fixed contact 11, thereby releasing the conduction state with the fixed contact 11. That is, the drop sensor 4 constitutes a normally on type sensor.

Further, a synthetic resin plate-like insulating member 10d is attached to the bottom surface of the other end side of the container 10, and when the movable contact 12 is separated from the fixed contact 11 and the inertial body 13 is brought into contact with the bottom surface of the container 10, the movable contacts 12 are not allowed to be electrically connected to the fixed contact 11 through the inertial body 13 by the insulating member 10 d.

The movable contacts 12 are respectively provided between the respective protruding portions 11a of the fixed contacts 11, and when the inertial body 13 is in contact with the movable contacts 12, a gap is formed between the inertial body 13 and the fixed contacts 11 without directly sandwiching the movable contacts 12 by the contact between the inertial body 13 and the protruding portions 11 a. Thus, even if the movable contact 12 is formed of a material that is easily deformed by extension, the movable contact 12 can be prevented from being deformed by extension. Further, a plurality of projections 12c projecting toward the bottom surface side of the container 10 are provided at intervals in the circumferential direction on the insulating member 12b on the cover plate 10a side, and when the inertial body 13 moves to one end side of the movable contact 12, the inertial body 13 cannot directly contact one end side of the movable contact 12 by the contact between the inertial body 13 and the projections 12 c. This prevents excessive stress from being generated on the one end side of the movable contact 12 due to the pressing of the inertial body 13, and prevents plastic deformation and characteristic change of the movable contact 12.

Since the acceleration sensor 5 has the same shape as the drop sensor 4, the same reference numerals as those of the drop sensor 4 are used to describe the respective components. The acceleration sensor 5 is different from the drop sensor 4 in that the movable contact 12 of the drop sensor 4 is brought into contact with the fixed contact 11 by the self weight of the inertial body 13, the movable contact 12 of the acceleration sensor 5 has higher restorability than the movable contact 12 of the drop sensor 4, and the movable contact 12 cannot be brought into contact with the fixed contact 11 only by the self weight of the inertial body 13. That is, the movable contact 12 of the acceleration sensor 5 contacts the fixed contact 11 when the apparent gravity of the inertial body 13 is greater than a predetermined value (for example, 1.5G) after receiving acceleration in the gravity direction. The drop sensor 4 thus constitutes a normally open sensor.

The control unit 6 is constituted by a microcomputer, and is connected to the switch 1h, the inflator 3, the drop sensors 4, and the acceleration sensor 5. Further, the control unit 6 has a timer function.

As shown in fig. 4, each of the drop sensor 4 and the acceleration sensor 5 is attached to a base 7a in a center unit 7, and the center unit 7 is accommodated in an accommodating portion 1i provided on the front side of the waist belt 1c of the wearable body 1 together with the control portion 6.

In this case, the drop sensors 4 are disposed on the same plane (on the substrate 7 a) that is substantially vertical, and are disposed so that the axes of the containers 10 mutually form a predetermined inclination angle. In order to achieve a state in which the drop sensor 4 is turned on, that is, the movable contact 12 is deflected by the weight of the inertial body 13 to contact the fixed contact 11, the axis of the container 10 must be within a predetermined angle range with respect to the horizontal plane. For example, in a state where the axis of the container 10 is inclined within a predetermined angle range, the inertial body 13 comes into contact with the bottom surface of the container 10, etc., and its own weight does not sufficiently act in the direction of flexing the movable contact 12, so that the contact between the movable contact 12 and the fixed contact 11 is released by a very small change in gravity due to the vertical movement, or if the inclination is larger, the movable contact 12 and the fixed contact 11 do not come into contact regardless of the magnitude of gravity. Then, the respective drop sensors 4 are radially arranged while changing their angles within a predetermined inclination angle so as to avoid overlapping of the ranges in which the above-described states occur. In this case, since the drop sensors 4 have a uniform characteristic in the circumferential direction of the container 10, at least 1 drop sensor 4 is turned on not only when the substrate 7a of the center unit 7 is inclined along a substantially vertical plane but also when the substrate is inclined with respect to a vertical plane. In addition, when the center unit 7 is in the falling state, all the falling sensors 4 are turned off.

On the other hand, the acceleration sensor 5 is disposed such that the axial center of the container 10 is substantially horizontal. That is, the acceleration sensor 5 is used to detect the upward acceleration when the user jumps, or when jumping a slightly small step, or the like, and does not have to detect such acceleration other than the upward acceleration. However, the number of the acceleration sensors 5 is not necessarily 1, and may be 2 or more, and a part thereof may be slightly inclined.

As shown in fig. 12 and 13, the harness-type seat belt having the above-described structure is used by wearing the wearing body 1 on the body of the user a. That is, the user inserts the two thighs into the thigh straps 1c of the wearable body 1, hangs the shoulder straps 1a on the two shoulders, and connects the front buckle 1f of the waist strap 1b, thereby wearing the wearable body 1 on the human body. In addition, a rope, not shown in the drawings, is connected to the connection ring 1e, and a hook of the rope is connected to a safety rope on a professional site, whereby the user is still suspended by the rope in the event of a roll-off. At this time, the human body is supported not only by the waist belt 1b but also by the shoulder belts 1a and the thigh belts 1c, so that the tension of the string acting on the human body is dispersed by the belts 1a, 1b, 1c, and the human body is stably supported.

The operation of the seat belt will be described below with reference to the operation of the control unit 6 in the flowchart of fig. 11.

First, if the wearing body 1 is worn on the user, the switch 1h of the wearing body 1 is turned on (S1), and the following procedure is started. That is, when the user a does not accelerate upward and the acceleration sensor 5 is not turned on (S2), for example, when the user a falls down by mistake from the high-level working place and all the drop sensors 4 are turned off due to the falling state (S3), and when a predetermined time T1 (e.g., 0.4 second) or more has elapsed after the off state of each drop sensor 4 (S4), the inflator 3 operates (S5). The bag 2 is thereby inflated, and the drop impact on the user a is absorbed by the bag portions 2a, 2b of the bag 2.

When the acceleration sensor 5 is turned on by the user a jumping or jumping over a small step and accelerating upward other than falling (S2), the predetermined time T2 (e.g., 0.4 second) elapses (S6), and then the turn-on and turn-off of each drop sensor 4 are determined (S3). For example, when the user a jumps, even if the respective drop sensors 4 are off during the jump, the respective drop sensors 4 are normally brought into contact with the ground at the time when the time T2 has elapsed, and therefore the respective drop sensors 4 are returned to the on state, and it is not determined that the respective drop sensors 4 are off in step S3, and the inflator 3 is not operated. When the user a mistakenly rolls down and turns off the respective drop sensors 4 and turns on the acceleration sensor 5 (S2), the off state of the respective drop sensors 4 continues even after the predetermined time T2 has elapsed (S6, S3), and therefore the inflator 3 operates after the predetermined time T1 has elapsed (S4) (S5).

As described above, in the harness type safety belt of the present embodiment, when the user a forgets to hook the rope to the safety rope or the like and rolls down from a high position, the bag 2 provided in the wearable body 1 can be inflated, and therefore, the drop impact can be absorbed by the bag 2, and the drop impact acting on the user a can be reduced. Further, when the user a rolls down with the hook of the rope connected to the safety rope, the user a is suspended by the rope, but the body of the user a is supported not only by the waist belt 1b but also by the shoulder belts 1a and the thigh belts 1c, so that the tension of the rope acting on the human body can be dispersed to the belts 1a, 1b, 1c, and the human body can be stably supported.

The bag 2 is formed of a 1 st bag portion 2a and a 2 nd bag portion 2b, and a portion corresponding to the back of the human body in the 1 st bag portion 2a is positioned above the connection ring 1e, and a portion corresponding to the back of the human body in the 2 nd bag portion 2b is positioned below the connection ring 1e, so that the bag portions 2a, 2b and the connection ring 1e do not interfere with each other, and a string can be connected to the connection ring 1e without interference at ordinary times.

In this case, the 1 st air bag portion 2a is formed so as to extend from the back head portion of the human body to the front face side via both shoulders, and the 2 nd air bag portion 2b is formed so as to cover the waist portion of the human body, so that the impact of falling at least on the back head portion and the waist portion of the human body can be absorbed by the air bag 2, and the impact on the human body can be effectively absorbed.

Further, a plurality of drop sensors 4 and acceleration sensors 5 are included, the drop sensors 4 being switched from the on state to the off state when the apparent gravitational force generated on the inertial body 13 decreases; when apparent gravity generated in the inertial body 13 increases, the acceleration sensor 5 is switched from the off state to the on state, and when the user jumps or jumps over a step, the airbag 2 is inflated if it is detected that all the drop sensors 4 have been off for a predetermined time T1 or more, except for a period of time when the predetermined time T2 has elapsed after the acceleration of the vertical movement other than the drop has caused the acceleration sensor 5 to be on, and therefore, malfunctions other than the drop can be reliably prevented, and reliability can be improved.

In this case, the respective fall sensors 4 and acceleration sensors 5 are provided at positions corresponding to the waist of the human body, and sudden movements near the waist are small in the human body, so that malfunctions of the fall sensors 4 and acceleration sensors 5 can be further reduced.

Further, since the front buckle 1g is detachably connected to the waist belt 1c of the wearable body 1 on the front side of the human body and the switch 1h is provided, and the control unit 6 is placed in the operable state when the front buckle 1g is connected to the switch 1h, the wearable body 1 can be put into the operable state while being used, and the operator can be surely prevented from forgetting to operate the wearable body.

Claims (6)

1. A harness-type safety belt comprising: a pair of shoulder belts, which are crossed on the back of the human body and hung on the two shoulders; a pair of ring-shaped thigh belts into which the two thighs of the human body are inserted, respectively; a waist belt disposed on a waist of a human body; a connecting portion which connects the string to the crossing portion of each shoulder belt, characterized by further comprising:

an air bag provided to the belt;

an inflation mechanism for inflating the airbag;

a fall detection mechanism that detects a fall of a human body;

a control mechanism which makes the air bag expand when the falling detection mechanism detects the falling of the human body,

the air bag is formed by a 1 st air bag part and a 2 nd air bag part, the part of the 1 st air bag part corresponding to the back of the human body is positioned above the connecting part, the part of the 2 nd air bag part corresponding to the back of the human body is positioned below the connecting part,

the first air bag portion 1 is formed to extend from the back of the human body to the front side through both shoulders;

the 2 nd bag portion is formed to cover the waist of the human body.

2. The harness type seatbelt according to claim 1, wherein the fall detecting means is constituted by at least 1 fall sensor for detecting a falling state of the human body and at least 1 acceleration sensor for detecting acceleration of the human body which is greater than a predetermined value of acceleration due to gravity;

the control means is configured to inflate the airbag if a state in which the drop sensor detects a dropped state continues for a predetermined time or more, in addition to a period in which a predetermined time has elapsed after the acceleration sensor detects that the acceleration equal to or greater than the predetermined value is generated.

3. The harness type seatbelt according to claim 2, wherein each of the drop sensors is composed of a container having a cylindrical shape, a fixed contact provided on an inner circumferential surface of the container, a plurality of elastically deformable movable contacts provided at intervals in a circumferential direction of an inside of the container, and an inertial body elastically deforming the movable contacts by its own weight to be in contact with the fixed contacts, the drop sensors being provided on substantially vertical same planes such that axes of the container form a predetermined inclination angle with each other;

the acceleration sensor includes a cylindrical container, fixed contacts provided on an inner peripheral surface of the container, a plurality of elastically deformable movable contacts provided at intervals in a circumferential direction of an inside of the container, and an inertial body that elastically deforms the movable contacts to contact the fixed contacts when acceleration greater than a predetermined value of gravitational acceleration or more is generated, and is provided such that an axis center of the container is substantially parallel to a horizontal direction;

the control mechanism includes: and a control means for inflating the air bag if a non-conductive state of the movable contact and the fixed contact of all the drop sensors is detected for a predetermined time or more, except for a period in which a predetermined time has elapsed after the detection of the conduction of the movable contact and the fixed contact of the acceleration sensor.

4. The harness type seatbelt according to claim 2 or 3, wherein each of the fall sensor and the acceleration sensor is provided at a position corresponding to a waist of a human body.

5. The harness type safety belt according to any one of claims 1 to 3, further comprising:

a front buckle detachably connected to the waist belt on a front side of a human body;

a switch for putting the control mechanism into an operable state when the front buckle is connected.

6. The harness type safety belt according to claim 4, further comprising:

a front buckle detachably connected to the waist belt on a front side of a human body;

a switch for putting the control mechanism into an operable state when the front buckle is connected.