JP2015228950A - High place work safety belt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high place work safety belt which has a tough and light-weight constitution, good usability, and safety.SOLUTION: The safety belt according to the invention includes: an openably/closable hook; an attachment metal fitting; and a rope connecting the hook and the attachment metal fitting. The rope includes: a bellows part including a bellows structure which is arranged in the center and is stretchable/contractable in a longitudinal direction; a binding part bound on both ends of the bellows part. The bellows part is configured such that plural elastic yarns are inserted and knitted in the longitudinal direction into a belt-like body composed of a first layer and a second layer knit-manufactured by a non-stretchable yarn, plural first layer sew-fastened parts, in which an elastic yarn knitted in a stretched state on the first layer side of the belt-like body is sew-fastened in a width direction, are arranged in the belt-like body longitudinal direction, plural second layer sew-fastened parts, in which an elastic yarn knitted in a stretched state on the second layer side of the belt-like body is sew-fastened in a width direction, are arranged in the belt-like body longitudinal direction, and the first layer sew-fastened parts and the second layer sew-fastened parts are arranged alternately in the belt-like body longitudinal direction.

Description

  The present invention relates to a safety belt for working at a high place that prevents a worker from falling when working at a high place such as a construction site.

  When working at heights such as construction sites, bridge construction, and steel tower construction, wear a safety belt and hang a hook fixed to the tip of the rope connected to it on the steel wire or steel pipe of the building. Safety measures that can prevent the fall of the elderly are taken. Since the work range is regulated by the length of the rope portion of the safety belt, when working while moving, it is necessary to remove the hook once and change the hooking position.

  When the operator falls, the entire load of the operator is supported by this rope, so that each member is required to have toughness that does not break or tear. Furthermore, various shock absorbing measures are required to minimize the impact received by the body and reduce body damage caused by a drop impact. For example, it is known to provide a shock absorber portion separately.

  On the other hand, if the rope for the safety belt is long, the range of movement of the operator will be widened, so it will not be necessary to hang the hook frequently.However, the rope will hang, making it easier to catch on the equipment and other parts of the site. This may impair the user's safety by disturbing the movement. To put it the other way around, the length of the ropes for safety belts so far is unsatisfactory in terms of both safety and workability. From the field, `` If it is a little longer, the range of free movement will spread and workability will increase. If it is a little shorter, it will be harder to catch and the safety will increase. ”

  As a safety belt for solving such problems, there is a safety belt provided with a winder capable of adjusting a winding length of a rope or a belt. A typical take-up safety belt for high-altitude work is a belt that is locked at that position if a belt with a hook at the tip is pulled out of the winder and stopped at a specified length. It is. Some patented inventions have also been proposed. For example, Patent Document 1 prevents the deformation of the rear end portion of the rope insertion holder of the rope expansion / contraction adjuster manufactured using aluminum in order to reduce the weight and the loose link, and minimizes the fall distance in the reverse fall state. In order to keep the limit, a reinforcing member is provided at the deformed portion to solve the problem. Patent Document 2 includes a safety belt winder including a lanyard to which a hook is attached and a winding case for winding the lanyard, and a hook hook is provided on the winding case. Provided not to be at both ends of the case with respect to the length direction of the belt, provided with a resistance part that prevents winding on the lanyard, the position of this resistance part is hooked to the hook part, and the hook mounting end is It is set as the structure determined so that winding could be prevented in the state which faces a lower side.

Utility Model Registration No. 3000178 JP 2007-167120 A

  However, although such a "winding type" safety belt is generally widespread, the expansion rate is overwhelmingly excellent because it is a winding type, but the purchase price is high and very heavy, There is also the possibility of breaking by impact. In the future, safety equipment equipped with a winder as described above will be required because a safer wearing device such as “Full Harness” will be required and a lighter and more convenient safety belt will be required. The belt is difficult in terms of weight reduction, and from the viewpoint of ensuring safety, it is inevitable that the structure is complicated, and as a result, there is a problem that manufacturing costs are also increased. Here, “full harness” refers to a safety belt that holds the whole body by passing a belt through the thigh and shoulders in addition to the torso, and there is no fear of falling out compared to the torso belt type. It is a safety belt that has the advantage of maintaining a natural posture when suspended without being concentrated on the body. In view of such problems, an object of the present invention is to propose a highly convenient safety belt that can be manufactured at low cost with a tough and lightweight configuration, particularly for a rope portion and a hook portion.

  The safety belt according to the present invention is a safety belt for working at high places, which includes a hook that can be opened and closed, a mounting bracket, and a rope that connects the hook and the mounting bracket, and the rope has a bellows structure that expands and contracts in the length direction at the center. A bellows portion and a binding portion bound to both ends of the bellows portion, and the bellows portion has a plurality of elasticities in a belt-like body composed of a first layer and a second layer woven with non-stretchable yarn. Insert the yarn in the length direction and knit it, and the first layer sewing location where the elastic yarn knitted in the stretched state on the first layer side of the band shape is sewn closed in the width direction in the length direction of the band shape Provide a plurality of locations in the length direction of the belt-like body, and provide a plurality of second-layer stitching locations in the length direction of the belt-like body. In the direction, the first layer sewing locations and the second layer sewing locations are provided alternately. Also, due to the elastic force of the elastic yarn, the first layer sewing site becomes the first layer side peak and the second layer side valley end, and the second layer sewing site becomes the second layer side peak and the first layer side. It is preferable that the bellows portion has a bellows shape. Furthermore, the bellows part is better to have both the stretchability by the elastic force of the elastic yarn and the extension limit by the non-stretchable yarn. The elastic yarn is preferably a stretch nylon yarn, but an elastic synthetic resin or natural rubber may be used.

  The hook includes a hook body having a hook portion at the tip and an annular portion at the base end, an opening / closing lever for turning the hook opening of the hook body so as to be openable and closable, and pivoting the opening / closing lever on the hook body. The open / close lever has a substantially inverted Y-shape and is provided with a support shaft on one side of the Y-shaped fork, and is supported in the vicinity of the base end and another support shaft on the other side. It is good to make it consist of a base part slidably arrange | positioned in the long hole which a fastener has, and an arm part which extends from a Y-shaped fork and opens and closes a shed. The open / close lever may have an outer edge formed in a curved shape or a bent shape from the base side toward the distal end side, and may further include a plurality of recesses. Further, the open / close lever has a Y-shaped bifurcated shape that is curved inward so that the hole of the annular portion of the hook body is not blocked when the hook of the hook body is opened. Furthermore, the opening / closing lever is less likely to slip when a convex portion is provided in the vicinity of the tip of the outer edge of the tip. If the hook body is made of forged aluminum, the weight can be reduced.

  The safety belt according to the present invention has the inconvenience that the rope of the conventional “rope type” safety belt does not expand and contract, and the inconvenience that the reel of the “winding type (reel type)” safety belt is heavy. Can also be solved. Since the shortest length can always be maintained at the time of work, it is possible to prevent accidents from being entangled with other workers and structures as well as the workers themselves. The safety belt according to the present invention is inexpensive to purchase, light in weight, and does not contain metal or plastic parts, so there is no fear of breaking. Although the rate of wearing safety belts has been increasing year by year due to the industry's enlightenment activities, the price is too high and the weight is too heavy. Under such circumstances, the safety belt according to the present invention is light in weight, affordable, easy to purchase, and highly convenient. Therefore, by promoting the improvement of the installation rate, it will lead to a decrease in crashes and contribute greatly to safety. Furthermore, if the hook body, the opening / closing lever, and the stopper fitting are made of cast aluminum, a lightweight and strong hook can be realized, and the work burden on the operator at high places can be reduced.

It is the schematic front view (a) and schematic plan view (b) which show an example of the safety belt concerning the present invention. It is the schematic which shows the structure of the bellows part of the rope which concerns on this invention. It is a figure which shows the stitching | suture structure of the bellows part of the rope which concerns on this invention. It is a schematic front view which shows an example of the hook which concerns on this invention. It is a schematic front view which shows the structure of the opening-and-closing lever of the hook which concerns on FIG. It is a schematic front view which shows the state which the opening of the hook concerning this invention opened. It is a figure which shows the opening / closing operation | movement of the hook which concerns on this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In each figure, the same number is attached | subjected to the same part, and the overlapping description is abbreviate | omitted. It should also be noted that the drawings may be exaggerated to understand the present invention and are not necessarily shown to scale. In addition, this invention is not limited to the Example shown below.

  FIG. 1 is a diagram schematically showing an example of a safety belt 1 for high-altitude work (hereinafter referred to as a safety belt 1) according to the present invention. As shown in FIG. 1, the safety belt 1 includes a hook 3 that can be opened and closed, a mounting bracket 4, and a rope 2 that connects the hook 3 and the mounting bracket 4. 2A and 2B are schematic views showing the configuration of the bellows portion 20 of the rope 2 according to the present invention. FIG. 2A is a sectional plan view in a contracted state, and FIG. 2B is an enlarged front view.

  The rope 2 will be described in detail. As shown in FIGS. 1 and 2A, the rope 2 includes a bellows portion 20 having a bellows structure that expands and contracts in the axial direction, and includes binding portions 21 and 23 at both ends of the bellows portion 20. Further, the binding portion 21 includes a mounting portion 22 that is attached to the hook 3, and the binding portion 23 includes a mounting portion 24 that is attached to the mounting bracket 4.

  FIG. 2B is an enlarged front view of the bellows part 20 and shows the bellows structure in a contracted state. Referring to FIG. 2 (b), the rope 2 is a belt-like body composed of a first layer 20a and a second layer 20b in which the bellows portion 20 is woven with non-stretchable yarn, and a plurality of elastic yarns are attached to the belt-like body. 201 is inserted in the length direction and knitted, and a predetermined place is closed with a sewing thread 202 in the width direction at equal intervals to form a valley when contracted. In Example 1, the non-stretchable yarn 200 is preferably nylon, but a yarn having a strong tensile force may be selected. The elastic yarn 201 is preferably stretch nylon, but may be made of elastic synthetic resin or natural rubber. Note that both ends in the axial direction and both ends in the width direction of the bellows portion 20 may be sewn. In addition, you may sew the 1st layer 20a and the 2nd layer 20b of a strip | belt-shaped body in a cylinder shape.

  Next, the stitching structure of the bellows portion 20 will be described in more detail. FIG. 3 is a view showing a stitching structure of the bellows portion 20 of the rope 2 according to the present invention. FIG. 3A shows a non-stretchable yarn 200a of the first layer 20a, a non-stretchable yarn 200b of the second layer 20b, and an elastic yarn. 201 shows a stitched state of 201 and sewing thread 202, (b) is an enlarged view of (a), and (c) shows a state in which the bellows portion 20 is expanded in the axial direction from the contracted state in (b). Yes. As shown in FIG. 3 (a), the bellows portion 20 has an arbitrary elastic yarn 201 in the contracted state where any non-stretchable valley of the adjacent first layer 20a and any non-stretchable of the second layer 20b. The yarn ends are woven together. Further, the valley end of the first layer 20a and the peak end of the second layer 20b are closed by the sewing thread 202 in the width direction. FIG. 3 (b) is an enlarged view of (a), but the elastic yarn 201 is directed upward toward the valley end A, C of the first layer 20a, and the peaks B, D of the second layer 20b. It will be understood that they are knitted with crossing the bottom towards. FIG. 3C shows a state in which the bellows portion 20 extends in the right direction (axial direction) from the state shown in FIG. That is, the distances A and C of the first layer 20a of the belt-like body and B and D of the second layer 20b are sewn even if the elastic yarn 201 is stretched, and each of A, C, B, and D is sewn. Since the bellows structure is stretched in a flat state, it is not stretched any further since it is sewn with the thread 202. Therefore, it has the strength to support the worker when dropped. In addition, by knitting a plurality of elastic yarns 201 into a woven fabric made of non-stretchable yarns 200, other elastic yarns 201 can maintain expansion and contraction even when some elastic yarns 201 are torn. Further, since the peaks and valleys of the bellows are closed at equal intervals in the width direction, it is possible to always keep the shortest length when the rope 2 expands and contracts, and does not disturb the operator.

  The hook 3 and the mounting bracket 4 are installed at both ends of the rope 2 obtained as described above. It is desirable to take a shape retention measure such as covering the binding portions 21 and 23 with another member (for example, shrink wrapping with heat-shrinkable plastic). In addition, when attaching the absorber part 7 to the binding parts 21 and 23, if the shock absorber is put together together at the time of this shape retention measure, not only the whole shape will become simple but this shape retention at the time of a fall. When the measure structure portion is destroyed, the falling energy is consumed by the amount of the destruction, which is preferable because some shock absorber effect is brought about.

  Next, the hook 3 will be described in detail. FIG. 4 is a schematic front view showing an example of the hook 3 according to the present invention. FIG. 5 is a schematic front view showing the configuration of the opening / closing lever of the hook 3 according to FIG. 4. FIG. 6 is a schematic front view showing a state where the hook of the hook 3 according to the present invention is opened. FIG. 7 is a view showing an opening / closing operation of the hook 3 according to the present invention. First, the overall configuration of the hook 3 will be described with reference to FIG. The hook 3 includes a hook body 32, an opening / closing lever 33, and a detachment stopper 34. The hook body 32 includes a flange portion 321 at the distal end and an annular portion 335 at the proximal end. The opening / closing lever 33 is pivotally supported in the vicinity of the annular portion 335 of the hook main body 32 and attached to the lower opening of the hook portion 321 of the hook main body 32 so that the hook opening of the hook main body 32 can be opened and closed. It is done. The stopper metal 34 is configured to be pivotally supported at the approximate center of the back side of the flange 321 of the hook body 32 to control the rotation of the opening / closing lever. It is preferable that the hook main body 32 is made of forged aluminum and the opening / closing lever 33 and the stopper metal fitting 34 are made of aluminum because a lightweight and strong hook is realized.

  Next, the hook body 32 will be described. The collar portion 321 has a ft roller portion that can be hooked and attached to a single pipe P (not shown) that is often used as a component of a scaffold at a construction site or the like. An opening for inserting the single pipe P from the lower side is formed, and a hole 323 for connecting a safety belt and a safety rope is formed in the annular portion 335.

  The opening / closing lever 33 is set to a length that can be arranged in a passing manner in the lower opening formed in the flange portion 321, and the outer edge of the opening / closing lever 33 is curved from the base side toward the tip side. A bent outer edge 330 is formed, and when the user puts the fingertip on the outer edge 330 of the opening / closing lever 33, the fingertip sinks into the outer edge 330. The opening / closing lever 33 is attached so as to be swingable with respect to the collar part 2 by inserting a support shaft 334 by incorporating a spring, and is normally in a state in which the opening part of the collar part 2 is closed by the spring. It is comprised so that.

  The stopper metal fitting 34 is positioned on the back side of the flange portion 321, and a spring is built in to insert the support shaft 342, and is pivotally supported in the approximate center of the back side of the hook body 32, thereby swinging against the flange portion 321. It is attached in a movable state and is normally biased toward the outside of the back portion of the hook body 32 by a spring. Further, the stopper metal 34 has a long hole 341 formed on the lower side thereof, and a support shaft 335 of the opening / closing lever 33 is attached to the long hole 341. As shown in FIG. 4, the support shaft 335 is always a long hole 341. In the case where the open / close lever 33 is locked and the release stopper 34 is squeezed in use, the support shaft 335 is moved away from the refracting portion and moved to a substantially arc portion of the long hole 341 as described later. Thereby, the lock state of the open / close lever 33 is released, and the open / close lever 33 can be opened. As described above, when the lock state of the opening / closing lever 33 is released, the hook 3 of the hook 3 is opened as shown in FIG.

  Next, the configuration of the opening / closing lever 33 will be described in detail with reference to FIG. As shown in FIG. 5, the open / close lever 33 has a substantially inverted Y-shape, which is a shape as seen from above the jet aircraft, and has an arm portion 331 extending toward the collar portion 321, and Y And a bifurcated base 332. A long hole provided with a support shaft 334 on one side of the Y-branched base 332, supported near the upper portion of the hole 334 of the annular portion 335 of the hook body 32, and the other stopper shaft 335 on the other side. 341 is slidably supported on the shaft 341.

  Further, as described above, the outer edge portion 330 of the opening / closing lever 33 is formed in a curved shape or a bent shape from the base portion side toward the distal end side, and includes the concave portions 330b, 330c, 330d, and 330e. When the user puts the fingertip on the outer edge 330 of the opening / closing lever 33, the fingertip of the index finger sinks into the recess 330b, the fingertip of the middle finger sinks into the recess 330d, the fingertip of the ring finger sinks into the recess 330d, and the fingertip of the little finger sinks into the recess 330e. It is configured to prevent finger slipping. Moreover, if the convex part 330a is comprised in the front end side of the outer side edge part 330, the further prevention of slip of a finger can be improved.

  Finally, with reference to FIG. 7, the state of operation of opening and closing the hook 3 will be described. FIG. 7A shows a state where the hook of the hook 3 is closed, and FIG. 7B shows a state where the hook is opened. Referring to FIG. 7 (a), when the user holds the hook 3, the fingertip of the user's index finger is in the recess 330b, the fingertip of the middle finger is in the recess 330c, and the fingertip of the ring finger is in the recess 330d. In addition, the fingertip of the little finger covers the recess 330e. When the user grasps the hook 3, the stopper metal 34 swings in the direction of arrow A with respect to the hook body 32. Then, the support shaft 335 of the opening / closing lever 33 fitted in the long hole 341 moves in the arrow B direction, and the locking state of the opening / closing lever 33 is released. If the user grasps the hook 3 in a state where the open / close lever 33 is unlocked, the open / close lever 33 is loaded in the direction of arrow C, and the support shaft 335 slides in the direction of arrow D about the support shaft 334. To do. As a result, the hook 3 of the hook 3 shown in FIG.

  Although the preferred embodiments in the safety belt according to the present invention have been illustrated and described above, it will be understood that various modifications can be made without departing from the technical scope of the present invention.

  The safety belt according to the present invention is light in weight, affordable and can be purchased easily, and the burden during work is reduced. It can be widely used as a tool that contributes to a significant reduction in the casualty rate in an accident.

1 Safety belt
2 ropes
20 Bellows (band)
20a 1st layer
20b Second layer
21 23 Binding part
200 Non-stretchable yarn
200a First layer non-stretchable yarn
200b Non-stretchable yarn of the second layer
201 Elastic yarn
202 Sewing thread
3 Hook
32 Hook body
33 Opening and closing lever
34 Detachment bracket
321 Isobe
322 Annular part
323 holes
330 outer edge
331 Arm
332 Base 330b 330c 330d 330e Recess
330a Convex part
341 long hole
334 335 342 Spindle
4 Mounting bracket

Claims (9)

A safety belt for working at high places, comprising a hook that can be opened and closed, a mounting bracket, and a rope that connects the hook and the mounting bracket,
The rope includes a bellows portion having a bellows structure that expands and contracts in the length direction at the center, and binding portions that are bound to both ends of the bellows portion,
The bellows portion is knitted by inserting a plurality of elastic yarns in the length direction into a belt-like body composed of a first layer and a second layer woven with non-stretchable yarn,
A plurality of first-layer sewing locations are provided in the longitudinal direction of the belt-like body, in which elastic yarns knitted in the stretched state on the first-layer side of the belt-like body are sewn and closed in the width direction. A plurality of second-layer sewing locations are provided in the length direction of the belt-like body, in which the elastic yarns knitted in the stretched state on the two-layer side are sewn and closed in the width direction. A safety belt for working at high places, characterized in that layer sewing locations and the second layer sewing locations are alternately arranged.   Due to the elastic force of the elastic yarn, the first layer sewing location becomes the first layer side crest and the second layer side trough end, and the second layer sewing location is the second layer side crest and The safety belt for high-altitude work according to claim 1, wherein the bellows portion is a bellows end on the first layer side, and the bellows portion has a bellows shape.   The safety belt for aerial work according to claim 1 or 2, wherein the bellows part has both stretchability by elastic force of the elastic yarn and elongation limit by the non-stretchable yarn.   The safety belt for high-altitude work according to any one of claims 1 to 3, wherein the elastic yarn is stretch nylon. The hook includes a hook body having a hook portion at a distal end and an annular portion at a proximal end, an opening / closing lever that pivots so as to open and close the hook opening of the hook body, and a rotation of the opening / closing lever supported by the hook body. With a locking bracket that controls movement,
The open / close lever has a substantially inverted Y-shape, and is provided with a support shaft on one side of the Y-shaped fork, and is supported in the vicinity of the base end, and another support shaft is provided on the other side and is a long hole provided in the stopper fitting A slidably disposed base and an arm that extends from the Y-shaped fork and opens and closes the mouth.
The safety belt for high-altitude work according to any one of claims 1 to 4.   6. The safety for aerial work according to claim 5, wherein the opening / closing lever has an outer edge formed in a curved shape or a bent shape from the base side toward the distal end side, and further includes a plurality of concave portions. band.   The opening / closing lever has a shape in which the Y-shaped fork is curved inward, and does not block the hole of the annular portion of the hook body when the hook body is opened. Item 7. A safety belt for high-altitude work according to Item 5 or 6.   The safety belt for high-altitude work according to any one of claims 5 to 7, wherein the opening / closing lever includes a convex portion in the vicinity of a tip of an outer edge portion of the tip portion.   9. The safety work belt for high places work according to any one of claims 5 to 8, wherein the hook body is made of forged aluminum.

Images