JP2007302445A - Belt sling with load excess warning device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To avoid the danger of a fall or the like of a lifted object due to breaking of a belt sling at the excess of tensile load by informing a worker to the effect that tensile load applied to the belt sling is in excess of withstand load, without impairing easiness in handling the belt sling. <P>SOLUTION: The belt sling 1 with a load excess warning device comprises a belt sling 2 formed with a slit 5 along a direction in which tensile load is applied, and a load excess warning device 6 inserted in the slit 5 to give a warning when pressure in a closing direction when the slit 5 is closed by the tensile load applied to the belt sling 2 exceeds predetermined magnitude. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a belt sling with an overload warning device. More specifically, the present invention relates to a belt sling with an overload warning device for safely lifting materials, luggage and the like.

  When lifting construction materials or heavy loads using a crane or the like, a belt sling that connects the hook of the crane and the load is used. At both ends of the belt sling, hooks are generally attached or rings are formed. For example, a belt sling is used to attach a hook or a ring at one end to a hook of a crane and to a mounting bracket such as a hook or an eyebolt attached to an object for lifting the hook or ring at the other end (hereinafter referred to as a suspended object) Used in connection.

By the way, the load capacity which is the upper limit of the weight which can lift a to-be-suspended object safely is defined by the belt sling. The load resistance is written on the belt surface as shown in Patent Document 1, for example. In order to safely carry out lifting work with a crane using a belt sling, the operator usually checks the weight of the suspended object, and then the belt sling corresponding to the weight, that is, the load resistance, corresponds to the suspended object. Select and use a belt sling that is larger than the weight.
JP-A-7-97171

  However, it is troublesome for the operator to check the weight of the suspended object every time the lifting work is performed. In addition, the indication of the load resistance indicated on the belt surface is generally small, and in some cases it may be difficult to read due to dirt, wear, etc., and it is difficult to read the load resistance at first glance. It is. Under these circumstances, the operator will naturally select a light and flexible belt sling such as a light and thin belt sling without checking the load resistance. Therefore, in the lifting work using the belt sling, it is difficult to say that a safe lifting work is always performed.

  Therefore, even if the lifting operation is performed without confirming the load resistance of the belt sling and the weight of the suspended object, the present invention will notify the operator if the tensile load applied to the belt sling exceeds the load resistance. It is an object of the present invention to provide a belt sling with an overload warning device that can reliably notify the user and thereby avoid the danger of dropping the suspended object due to the belt sling breaking when the tensile load is exceeded. .

  In order to achieve this object, a belt sling with an overload warning device according to the first aspect of the present invention includes a belt sling in which a slit is formed along a direction in which a tensile load is applied, and a belt sling that is inserted into the slit. And an overload warning device that issues a warning when the pressure in the closing direction when the slit is closed in accordance with the acting tensile load exceeds a predetermined magnitude.

  Therefore, the tensile load is converted into the pressure in the slit in the direction in which the slit closes and acts on the overload warning device, and if the pressure exceeds a predetermined size, an alarm is given to notify that the excessive tension is excessive. It is done. Here, work is done by calculating in advance the pressure applied in the closing direction of the slit when a tensile load exceeding the load capacity of the belt sling is applied to the belt sling, and setting it as a "predetermined size" The person can recognize that the tensile load exceeds the load resistance by an alarm.

  According to a second aspect of the present invention, in the belt sling with the overload alarm device according to the first aspect, the overload alarm device includes an urging member that elastically urges the slit in a direction to open the slit, Alarm means for emitting at least one of an alarm sound and light when the biasing member is elastically deformed to a predetermined position is provided. In this case, when the suspended object is lifted using the belt sling, the slit is gradually closed against the urging force of the urging member. When the pressure in the closing direction exceeds a predetermined magnitude, the urging member is elastically deformed to a predetermined position. When the biasing member is elastically deformed to a predetermined position, the alarm means emits at least one of an alarm sound and light. Thereby, the worker can recognize that the tensile load exceeds the load resistance through hearing and vision.

  According to a third aspect of the present invention, in the belt sling with the overload alarm device according to the first aspect, the overload alarm device is a hollow body having an opening exposed from the slit and a lid for closing the opening. When the pressure is acting on the hollow body at a predetermined size or less, the opening is closed with the lid to seal the hollow body, and the pressure exceeds the predetermined size for the hollow body. The hollow body is compressed when it acts, and the lid is removed from the opening by the air compressed in the hollow body. In this case, the hollow body is compressed when the object to be suspended is lifted using a belt sling and the pressure in the slit closing direction exceeds a predetermined size. That is, the air in the hollow body is compressed. The compressed air squeezes the lid that closes the opening from the inside of the hollow body, so that the lid is released from the opening while generating a firing sound. The operator can recognize that the tensile load exceeds the load resistance by listening to the firing sound and visually recognizing that the lid body has been removed from the opening.

  According to a fourth aspect of the present invention, in the belt sling with the overload warning device according to the third aspect, the openings are formed one by one at positions facing each other in the hollow body, and between the lid bodies that block the openings. It connects with a connection member, and when a cover body remove | deviates from an opening, it will be in the state suspended from the opening by the connection member. In this case, the object to be suspended is lifted using a belt sling, and when the pressure in the slit closing direction exceeds a predetermined size, the hollow body is compressed, and at least the lid covering each opening is Disengage while firing one shot. As a result, the operator can recognize that the tensile load has exceeded the load resistance by listening to the firing sound and visually recognizing the lid that has been removed from the opening. In addition, when the lid is removed from the opening after performing the lifting work, the lid is suspended from the opening by the connecting member, so the operator may overlook that the lid has been removed from the opening. Disappear. Furthermore, even if the lid of each opening is removed due to the compression of the hollow body, the lid removed from the opening by the connecting member connecting the lids is separated from the hollow body only within a certain range. Therefore, the lid can be prevented from scattering.

  According to a fifth aspect of the present invention, in the belt sling with the overload alarm device according to the first aspect, the overload alarm device includes an elastic deformable body that elastically deforms in a closing direction when a pressure is applied, and the elastic deformation. A wedge-shaped portion that is provided inside the body and moves in the closing direction in accordance with the elastic deformation of the elastic deformation body, and the pressure acts on the elastic deformation body in the closing direction beyond the predetermined size. Accordingly, a protruding member that protrudes from the inside toward the outside as the wedge-shaped portion moves in the closing direction is provided. In this case, when the suspended object is lifted using the belt sling, the slit is gradually closed against the elastic biasing force of the elastic deformable body. When the elastic deformation body is elastically deformed by the pressure in the closing direction, the wedge-shaped portion moves in the slit closing direction in synchronization with the elastic deformation. When the pressure in the closing direction eventually exceeds a predetermined magnitude, the inclined surface of the wedge-shaped portion pushes the protruding member toward the outside of the elastic deformable body as the wedge-shaped portion moves in the closing direction. The operator can recognize that the tensile load exceeds the load resistance by visually recognizing the protruding member protruding from the elastic deformable body.

  According to a sixth aspect of the present invention, in the belt sling with the overload alarm device according to the first aspect, the overload alarm device includes a container in which a liquid is sealed and a color body that permeates the liquid and develops color. When the pressure exceeds a predetermined size, at least a part of the container is damaged, and the liquid leaking from the damaged portion penetrates into the coloring body. In this case, when the suspended object is lifted using the belt sling, the container is compressed by the pressure in the slit closing direction, and when the pressure exceeds a predetermined size, a part of the container is damaged. Become. When the liquid leaking from the damaged portion penetrates into the color former, the color former is colored. The operator can recognize that the tensile load exceeds the load resistance by visually recognizing that the coloring body is colored. In addition, litmus paper can be considered as the color former. When using litmus paper that develops color with respect to acidic liquid as the color former, the acidic liquid is sealed in a container, and when litmus paper that develops color with respect to alkaline liquid is used as the color former, alkaline liquid is used. Can be enclosed in a container.

  According to the belt sling with an overload warning device according to claim 1, when a pressure exceeding a predetermined magnitude is applied in the closing direction of the slit of the belt sling when the lifting operation using the belt sling is performed, the overload warning device Will alert the operator immediately if the tensile load on the belt sling exceeds the load capacity, prompting the operator to stop lifting and replace the belt sling. . This makes it possible to avoid danger such as dropping of the suspended object due to the breaking of the belt sling when the tensile load is exceeded when performing the lifting work using the belt sling, and the safety of the lifting work can be improved. In addition, since an overload warning device is inserted into the slit of the belt sling and an alarm is issued from the overload warning device according to the pressure applied in the closing direction of the slit, the belt sling can be used without impairing the functionality of the belt sling. When the tensile load exceeds the load resistance, the operator can be informed accordingly.

  According to the belt sling with the overload warning device according to claim 2, since the warning is issued according to the degree of elastic deformation of the biasing member, the pressure in the slit closing direction exceeds a predetermined magnitude. It can be detected with a simple structure. Also, if the pressure in the slit closing direction exceeds a predetermined size, an alarm sound or light is emitted, so that the operator has exceeded the predetermined pressure in the slit closing direction. That is, it can be easily detected that the tensile load applied to the belt sling exceeds the load resistance.

  According to the belt sling with the overload warning device according to claim 3, when the lifting operation is performed, the lid that closes the opening of the hollow body emits a firing sound when the slit is closed and the hollow body is crushed. Since it is made to come off from the opening while firing, it can be detected with a simple structure whether or not the pressure in the slit closing direction exceeds a predetermined magnitude. In addition, from the manner in which the lid is removed from the opening and the firing sound that is generated when the lid is removed from the opening, the operator has confirmed that the pressure in the slit closing direction has exceeded a predetermined magnitude, that is, the tensile load is Can easily be detected.

  According to the belt sling with the overload warning device according to claim 4, when the lid is removed from the opening while the suspended object is suspended in the air, the lid is suspended from the opening. Therefore, the operator does not overlook that the lid has been removed from the opening. Even if the lid of each opening is removed, the lid removed from the opening by the connecting member that connects the lids is separated from the hollow body only within a certain range, so the lid is scattered. This can be prevented.

  According to the belt sling with the overload warning device according to claim 5, when the lifting operation is performed, the slit is closed and the elastic deformation body is elastically deformed so that the protruding member protrudes from the elastic deformation body. Whether or not the pressure in the closing direction exceeds a predetermined magnitude can be detected with a simple structure. Further, the operator can easily confirm that the pressure in the slit closing direction exceeds a predetermined size, that is, the tensile load exceeds the load resistance, by visually recognizing the manner in which the protruding member protrudes from the elastic deformation body. Can be sensed.

  According to the belt sling with the overload alarm device according to claim 6, when the liquid is leaked from the damaged portion when the lifting operation is performed and the slit is closed and the container is crushed, the color is developed. Since the body is colored, it is possible to detect with a simple structure whether or not the pressure in the closing direction of the slit exceeds a predetermined size. Further, the operator can easily sense that the pressure in the slit closing direction has exceeded a predetermined size, that is, the tensile load has exceeded the load resistance, by visually recognizing that the colored body has developed color. it can.

  Hereinafter, the configuration of the present invention will be described in detail based on embodiments shown in the drawings.

  1 to 5 show a first embodiment of a belt sling with an overload warning device of the present invention. The belt sling 1 with the overload warning device of the present embodiment includes a belt sling 2 in which a slit 5 is formed along a direction in which a tensile load is applied, and a tensile load that is inserted into the slit 5 and acts on the belt sling 2. And an overload warning device 6 that issues a warning when the pressure in the closing direction when the slit 5 is closed exceeds a predetermined magnitude.

  As shown in FIG. 1, the belt sling 2 is formed by folding an endless belt and stitching it together in a two-layer structure. Rings 4 are formed at both ends of the belt sling 2 to be hooked on a hook 3 of a crane. In the present embodiment, an example in which the rings 4 are formed at both ends of the belt sling 2 will be described. However, the hooks may be used instead of the rings 4, and the form of the both ends of the belt sling 2 may be a crane hook 3 or the like. As long as it is formed so as to be hooked on, it can be appropriately changed.

  A slit 5 is formed in the vicinity of the base of one ring 4 of the belt sling 2 along the direction in which a tensile load is applied when the belt sling 2 is used and along the width direction of the belt sling 2. When the belt sling 2 is formed, the ring 4 is formed by not sewing the both ends when the endless belt is folded when the endless belt is folded to form a two-layer structure, and the slit 5 is formed on one side. It is formed by not sewing the vicinity of the base of the ring 4. Therefore, the slit 5 penetrates the belt sling 2 in the width direction. An overload warning device 6 is inserted into the slit 5 and fixed. In this embodiment, one of the two wheels 4 is hooked on a crane hook 3 and the other is hooked on a mounting bracket (for example, a hook) attached to the suspended object to lift the suspended object (so-called straight) One ring 4 of the belt sling 2 on the assumption that the two rings 4 are hooked on the hook 3 of the crane and the suspended object is supported between both ends of the belt sling 2 (so-called two-point suspension). Although the slit 5 is formed in the vicinity of the base of the slit 5, the formation location of the slit 5 is not limited to this and can be changed as appropriate. For example, if the belt sling 2 is used only for straight suspension, the slit 5 may be formed at the center of the belt sling 2.

  As shown in FIG. 2, the overload alarm device 6 includes an overload alarm device body 7 and a pair of urging members 8 and 9. The outer shape of the casing 10 of the overload alarm device body 7 is formed in a plate shape. Display windows 10 a and 10 b are formed on one end surface of the housing 10. The display windows 10 a and 10 b are exposed from the slit 5 when the overload warning device 6 is inserted into the slit 5. Further, in the case 10, when the overload warning device 6 is inserted into the slit 5, the first and second pushes are respectively provided on the surface opposite to the back surface 2a of the belt sling 2, that is, the front surface and the back surface of the housing 10, respectively. The type switches 11 and 12 are exposed, and a plurality of holes 13 (see FIG. 3) are formed on the switches 11 and 12.

  The urging members 8 and 9 are elastically urged toward the direction in which the slits 5 are opened, and are constituted by leaf springs formed by bending a thin metal plate into a substantially C shape. The urging members 8 and 9 are fixed to the front and back surfaces of the housing 10 so as to straddle the first and second push switches 11 and 12 and the hole 13. Further, the back surface 2a of the belt sling 2 and the surfaces of the urging members 8 and 9 facing the back surface 2a are fixed by a fixing means such as an adhesive. That is, the belt sling 2 and the overload warning device 6 are in an integrated state.

  The urging members 8 and 9 are disposed between the back surface 2a of the belt sling 2 and the housing 10, and when the slit 5 is closed due to a tensile load acting on the belt sling 2, the closing direction (in FIG. 2) (The direction of the broken line arrow A) is gradually elastically deformed, and when the pressure in the closing direction reaches a predetermined size, it is elastically deformed to a predetermined position. The second push type switches 11 and 12 are configured to be turned on. That is, the “predetermined magnitude” described here is the magnitude of the pressure in the closing direction when the slit 5 is closed due to the tensile load acting on the belt sling 2 beyond its load capacity. The “predetermined position” indicates a position where the urging members 8 and 9 turn on the first and second push-type switches 11 and 12.

  As shown in FIG. 4, the overload alarm device body 7 includes first and second push-type switches 11 and 12, a power switch 14, a power device 15, a control device 16, an operation state confirmation unit 17, and an alarm unit 18. Has been. The power supply device 15 supplies power to the first and second push-type switches 11 and 12, the control device 16, the operation state confirmation unit 17 and the alarm unit 18, and includes a battery 15a. The battery 15a is, for example, a button battery or an AA alkaline battery.

  The control device 16 performs sequence control of the overload warning device main body 7 and is composed of, for example, a CPU or MPU. The control device 16 is electrically connected to each of the first and second push-type switches 11 and 12, the power supply device 15, the operation state confirmation unit 17, and the alarm unit 18. The first and second push switches 11 and 12 are arranged in the closing direction when the slit 5 is closed along with the tensile load when a tensile load exceeding the load resistance of the belt sling 2 is applied to the belt sling 2. It functions as a detection unit that detects pressure. In other words, a tensile load exceeding the load resistance of the belt sling 2 acts on the belt sling 2, and the biasing members 8 and 9 are determined in advance by the pressure in the closing direction when the slit 5 is closed in accordance with the tensile load. It detects that it has been elastically deformed to a position. When the first and second push type switches 11 and 12 are turned on by the biasing members 8 and 9, an electrical signal is output from the first and second push type switches 11 and 12 to the control device 16. The control device 16 warns an electric signal indicating that the first and second push type switches 11 and 12 are turned on when an electric signal is inputted from both the first and second push type switches 11 and 12. Output to means 18. In this embodiment, the first and second push switches 11 and 12 are used to detect a predetermined pressure. However, instead of the first and second push switches 11 and 12, a photosensor is used. A magnetic sensor or the like may be used, and when the urging members 8 and 9 are elastically deformed to a predetermined position, it can be detected and the detection signal can be output to the alarm means 18. Anything can be used.

  The alarm means 18 includes drivers 19 and 20, a blue LED 21, and a speaker 22. When an electrical signal indicating that the first and second push-type switches 11 and 12 are turned on is input from the control device 16 to the drivers 19 and 20, the driver 19 causes the blue LED 21 to emit light, and the driver 20 is transmitted from the speaker 22. Generate an alarm sound. The light emission of the blue LED 21 is visually recognized through the display window 10 a of the housing 9. The alarm sound of the speaker 22 is emitted to the outside of the housing 9 through the hole 13 of the housing 9.

  The control device 16 constantly monitors the output level of the voltage of the battery 15a. Then, an electric signal indicating that the output level of the voltage of the battery 15a has fallen below a predetermined threshold is output to the operating state confirmation means 17 when the output level has fallen below a predetermined threshold.

  The operation state confirmation unit 17 includes a driver 23, a white LED 24, and a red LED 25. When the power switch 14 is turned on, the control device 16 always emits the white LED 24 through the driver 23. When an electric signal indicating that the output level of the voltage of the battery 15a has fallen below a predetermined threshold is input from the control device 16 to the driver 23, the driver 23 turns off the white LED 24 and causes the red LED 25 to emit light. Light emission of the white LED 24 and the red LED 25 is visually recognized through the display window 10 b of the housing 9. Therefore, the operator can determine whether or not the battery 15a needs to be replaced based on the emission color from the display window 10b. That is, when white light is visually recognized from the display window 10b, replacement of the battery 15a is unnecessary, and when red light is visually recognized from the display window 10b, it can be determined that replacement of the battery 15a is necessary. .

  When the object to be suspended is lifted by using the belt sling 1 with an overload warning device configured as described above, the slit 5 gradually moves against the elastic biasing force of the biasing members 8 and 9. Go closed. When the pressure in the closing direction of the slit 5 exceeds a predetermined magnitude, the biasing members 8 and 9 are elastically deformed to a predetermined position. When the urging members 8 and 9 are elastically deformed to a predetermined position, the urging members 8 and 9 turn on the first and second push-type switches 11 and 12. As shown in the flowchart of FIG. 5, when at least one of the first and second push switches 11 and 12 is off, the control device 16 is in a standby state (S1; N), and the first and second pushes. When both of the expression switches 11 and 12 are turned on (S1; Y), the blue LED 21 is caused to emit light and an alarm sound is generated from the speaker 22 (S2). Therefore, when the tensile load applied to the belt sling 2 exceeds the load resistance, the operator can immediately know that by the light emission of the blue LED 21 and the alarm sound of the speaker 22. Accordingly, it is possible to prompt the operator to stop the lifting work, and it is possible to avoid a danger such as dropping of an object to be lifted due to the breaking of the belt sling when the tensile load is exceeded in performing the lifting work. Further, since the overload warning device 6 is inserted into the slit 5 of the belt sling 2 and an alarm is issued in accordance with the pressure applied in the closing direction of the slit 5, the belt sling 2 can be easily handled without impairing the original handleability. When the tensile load applied to the sling 2 exceeds the load resistance, the operator can be informed accordingly.

  Next, FIGS. 6 to 8 show a second embodiment of the belt sling with an overload warning device of the present invention. In addition, in this embodiment, the same code | symbol is attached | subjected about the member same as 1st Embodiment, and the description is abbreviate | omitted.

  The belt sling 30 with an overload warning device of the present embodiment is accompanied by a belt sling 2 in which a slit 5 is formed along a direction in which a tensile load is applied, and a tensile load that is inserted into the slit 5 and acts on the belt sling 2. And an overload warning device 31 that issues a warning when the pressure in the closing direction when the slit 5 is closed exceeds a predetermined magnitude. The overload warning device 31 is a hollow body 32 having openings 33 a and 33 b exposed from the slit 5 and lid bodies 34 and 35 that close the openings 33 a and 33 b, and accompanies a tensile load acting on the belt sling 2. Thus, when the pressure in the closing direction when the slit 5 is closed acts on the hollow body 32 below a predetermined size, the openings 33a and 33b are closed by the lid bodies 34 and 35 so that the hollow body 32 is closed. When the pressure in the closing direction when the slit 5 is closed in accordance with the tensile load acting on the belt sling 2 in a sealed state and acting on the hollow body 32 exceeds a predetermined size, the hollow body 32 is The lids 34 and 35 are removed from the openings 33a and 33b by the compressed air compressed in the hollow body 32.

  As shown in FIGS. 6 and 7, the hollow body 32 includes a cylinder 33 having openings 33 a and 33 b at both ends and lid bodies 34 and 35. The cylinder 33 forms the main body of the hollow body 32, and is used by being inserted into the slit 5 so that the outer peripheral surface 33c faces the back surface 2a of the belt sling 2 and the openings 33a and 33b are exposed from the slit 5. (See FIG. 8). The cylinder 33 functions as a detection unit that detects whether or not the pressure in the closing direction when the slit 5 is closed due to the tensile load acting on the belt sling 2 exceeds a predetermined magnitude. In this case, a tensile load exceeding the load resistance of the belt sling 2 acts on the belt sling 2 so that it is crushed when a pressure in the closing direction is applied when the slit 5 is closed along with the tensile load. It is configured.

  The openings 33a and 33b are closed by lids 34 and 35. The lids 34 and 35 protrude from the disk-shaped flanges 34a and 35a having an outer diameter larger than the inner diameters of the openings 33a and 33b, and the back surfaces of the flanges 34a and 35a, and can be press-fitted into the openings 33a and 33b. It is comprised from the cylindrical cork stoppers 34b and 35b currently formed.

  The lids 34 and 35 are connected by a connecting member 36 through the cylinder 33. The connecting member 36 is made of, for example, a string. One end of the cord is fixed to the cork stopper 34b by, for example, an adhesive, and the other end is taken out from the opening 33b through the inside of the cylinder 33 from the opening 33a of the cylinder 33 and fixed to the cork stopper 35b by, for example, an adhesive. ing. The length of the string is sufficiently long with respect to the height of the cylinder 33. Therefore, when the lids 34 and 35 are detached from the openings 33a and 33b, the lids 34 and 35 are suspended from the openings 33a and 33b by the connecting member 36. In this embodiment, a string is used as an example of the connecting member 36, but the lid 34 and the lid 35 are connected by a film-like member or a compression coil spring instead of the string. It is sufficient that the lids 34 and 35 are connected so as to be suspended from the openings 33a and 33b when they are removed from the openings 33a and 33b.

  The cork stoppers 34 b and 35 b are press-fitted into the openings 33 a and 33 b so that the connecting member 36 is accommodated in the hollow body 32. As a result, the hollow body 32 is sealed. As shown in FIGS. 7 and 8, the hollow body 32 is inserted into the slit 5 so that the outer peripheral surface 33 c of the cylinder 33 faces the back surface 2 a of the belt sling 2 and the lid bodies 34 and 35 are exposed from the slit 5. In the slit 5, the outer peripheral surface 33c of the cylinder 33 and a part of the back surface 2a of the belt sling 2 are fixed by a fixing means such as an adhesive. That is, the hollow body 32 and the belt sling 2 are in an integrated state.

  The cork stoppers 34b and 35b act when the pressure in the closing direction when the slit 5 is closed in accordance with the load acting on the belt sling 2 is less than a predetermined magnitude with respect to the outer peripheral surface 33c of the cylinder 33. In other words, a tensile load less than the load resistance of the belt sling 2 acts on the belt sling 2, and the closing direction when the slit 5 is closed in accordance with this tensile load (the direction of the broken line arrow A in FIG. 7). When the pressure is applied to the outer peripheral surface 33c of the cylinder 33, the inside of the hollow body 32 is kept in a sealed state, while the slit 5 is closed due to the tensile load acting on the belt sling 2. When the pressure in the closing direction of the cylinder 33 acts on the outer peripheral surface 33c of the cylinder 33 exceeding a predetermined size, that is, a tensile load exceeding the load resistance of the belt sling 2 is applied to the belt. When the pressure in the closing direction when acting on the ring 2 and closing the slit 5 with this tensile load acts on the outer peripheral surface 33c of the cylinder 33, the cylinder 33 is crushed and compressed in the hollow body 32. The air is pressed into the openings 33a and 33b so as to be fired from the openings 33a and 33b.

  When the lifting operation is performed using the belt sling 30 with the overload warning device configured as described above, the cylinder 33 is compressed when the pressure in the closing direction of the slit 5 exceeds a predetermined size. That is, the air in the hollow body 32 is compressed. The cork stoppers 34b and 35b are fired from the openings 33a and 33b by the compressed air. At this time, a firing sound is emitted. Accordingly, the operator listens to the firing sound and visually recognizes that the lids 34 and 35 are removed from the openings 33a and 33b, so that the pressure in the closing direction of the slit 5 exceeds a predetermined magnitude, that is, a belt sling. It can be easily detected that a tensile load exceeding the load resistance is applied to 2. When the lids 34 and 35 are removed from the openings 33a and 33b, the lids 34 and 35 are suspended from the openings 33a and 33b by the connecting member 36. It will not be overlooked that 34 and 35 have come off. Further, even if the lids 34 and 35 are removed from the openings 33a and 33b due to the crushing of the cylinder 33, the lids removed from the openings 33a and 33b by the connecting members 36 connecting the lids 34 and 35 are cylindrical. Since the distance is only within a certain range from 33, the lid bodies 34 and 35 can be prevented from being scattered.

  Next, FIGS. 9 to 11 show a third embodiment of the belt sling with an overload warning device of the present invention. In addition, in this embodiment, the same code | symbol is attached | subjected about the member same as 1st and 2nd embodiment, and the description is abbreviate | omitted.

  The belt sling 40 with an overload warning device according to the present embodiment includes a belt sling 2 in which a slit 5 is formed along a direction in which a tensile load is applied, and a tensile load that is inserted into the slit 5 and acts on the belt sling 2. An overload warning device 41 that issues a warning when the pressure in the closing direction when the slit 5 is closed exceeds a predetermined magnitude. The overload warning device 41 includes an elastic deformable body 42 that elastically deforms in the closing direction by the pressure in the closing direction when the slit 5 is closed in accordance with the tensile load acting on the belt sling 2, and the elasticity Wedge-like portions 59 and 60 which are provided inside the deformable body 42 and move in the closing direction in accordance with the elastic deformation of the elastic deformable body 42, and the pressure is predetermined in the closing direction with respect to the elastic deformable body 42. Protruding members 46 and 47 projecting from the inside toward the outside as the wedge-shaped portions 59 and 60 move in the closing direction are provided.

  The elastic deformable body 42 is used by being inserted into the slit 5 and fixed to the belt sling 2. As shown in FIG. 9, the square plate-like base 43 and the belt sling 2 on both end faces of the base 43 are used. Slide members 44, 45 attached so as to slide relative to the closing direction when the slit 5 is closed in accordance with the tensile load acting on (a broken line arrow A direction in FIG. 9), and the sliding member 44 , 45 slides to a predetermined position, projecting members 46, 47 projecting from the base 43, and biasing members 48-51 for resiliently biasing the slide members 44, 45 in the direction to open the slit 5. It has.

  Long grooves 52 and 53 are formed on both end surfaces of the base 43 along the longitudinal direction. A part of the slide members 44 and 45 is slidably inserted into the long grooves 52 and 53. As shown in FIGS. 9 and 10, long grooves 54 and 55 having a T-shaped cross section are formed on the surface of the base 43 from the center so as to be opposite each other between the long groove 52 and the long groove 53. It is formed in a straight line over end faces other than the end face. In the long grooves 54 and 55, projecting members 46 and 47 having a substantially H-shaped cross section and slightly shorter than the length of the long grooves 54 and 55 are slidably inserted. In other words, the T-shaped portion that is the lower portion of the projecting members 46 and 47 is slidably inserted. Therefore, the remaining portions of the projecting members 46 and 47 that are not inserted into the long grooves 54 and 55, that is, the I-shaped portion that is the upper portion of the projecting members 46 and 47, protrudes from the surface of the base 43. The base end of the upper part of the projecting members 46 and 47 projecting from the surface of the base 43 has a rounded shape.

  As shown in FIG. 11, inside the long grooves 54 and 55, a tension coil spring 56 is disposed between the base 43 and the protruding member 46 and between the base 43 and the protruding member 47. The base end of the tension coil spring 56 is fixed to the back wall of the long grooves 54 and 55, and the tip is fixed to the base end of the lower part of the projecting members 46 and 47. As a result, the projecting members 46 and 47 are pulled into the long grooves 54 and 55 by the elastic biasing force of the tension coil spring 56.

  The slide members 44 and 45 are fixed to a part of the back surface 2a of the belt sling 2 by a fixing means such as an adhesive, and in the closing direction when the slit 5 is closed due to a tensile load acting on the belt sling 2. Pressure receiving portions 57, 58 that receive pressure from the belt sling 2, and wedge-shaped portions 59 that protrude from the pressure receiving portions 57, 58 so that the apexes of the belt sling 2 are directed toward the base 43 and obliquely face each other, 60 and square plate-like insertion portions 61 and 62 which are provided in the pressure receiving portions 57 and 58 so as to face the long grooves 52 and 53 and are inserted into the long grooves 52 and 53.

  In the long grooves 52 and 53, biasing members 48 and 49 are disposed between the base 43 and the insertion portion 61, and biasing members 50 and 51 are disposed between the base 43 and the insertion portion 62. The urging members 48 to 51 are made of a leaf spring formed by bending a thin metal plate into a substantially V shape. One end of the urging members 48 and 49 is fixed to the distal end of the insertion portion 61, and the other end is fixed to the back wall of the long groove 52. One end of the urging members 50 and 51 is fixed to the distal end of the insertion portion 62, and the other end is fixed to the back wall of the long groove 53. The distal end portion of the insertion portion 61 is placed in the long groove 52 with the biasing members 48 and 49 interposed therebetween, and the distal end portion of the insertion portion 62 is placed in the biasing members 50 and 51 between the base 43. Is inserted in the long groove 53 in a state of interposing. Therefore, when the pressure in the closing direction when the slit 5 is closed due to the tensile load acting on the belt sling 2 acts on the pressure receiving portions 57 and 58, the slide members 44 and 45 become elastic of the biasing members 48 to 51. It gradually slides toward the base 43 against the urging force, and eventually the wedge-shaped portions 59 and 60 come into contact with the base ends of the upper portions of the protruding members 46 and 47 protruding from the surface of the base 43. When the slide members 44 and 45 are further slid toward the base 43, the inclined surfaces 59 a and 60 a of the wedge-shaped portions 59 and 60 press the upper base ends of the protruding members 46 and 47. When the inclined surfaces 59a, 60a press the base ends of the upper portions of the projecting members 46, 47, the projecting members 46, 47 resist the elastic biasing force of the tension coil spring 56 from the inside of the base 43 (in FIG. 9). Projecting in the direction of the broken arrow B).

  The elastic force of the urging members 48 to 51 is wedge-shaped when the pressure in the closing direction when the slit 5 is closed in accordance with the tensile load acting on the belt sling 2 reaches a predetermined size. The parts 59 and 60 are set to move to a predetermined position and come into contact with the upper base ends of the protruding members 46 and 47 protruding from the surface of the base 43. That is, the “predetermined magnitude” described here indicates the magnitude of the pressure in the closing direction when the slit 5 is closed in accordance with the tensile load acting on the belt sling 2 with its load resistance. The “predetermined position” indicates a position where the inclined surfaces 59 a and 60 a are in contact with the base ends of the protruding members 46 and 47 protruding from the surface of the base 43.

  When the lifting operation is performed using the belt sling 40 with the overload warning device configured as described above, the slit 5 is gradually closed against the elastic biasing force of the elastic deformable body 42. When the elastic deformation body 42 is elastically deformed by the pressure in the closing direction, the wedge-shaped portions 59 and 60 are moved in the closing direction of the slit 5 in synchronization with the elastic deformation. When the pressure in the closing direction eventually exceeds a predetermined magnitude, the inclined surfaces 59a and 60a push the protruding members 46 and 47 out of the base 43 as the wedge portions 59 and 60 move in the closing direction. Therefore, it is possible to detect with a simple structure whether or not the pressure in the closing direction of the slit 5 exceeds a predetermined magnitude. Further, the operator visually recognizes the projecting members 46 and 47 projecting from the elastic deformable body 42 so that the pressure in the closing direction exceeds a predetermined size, that is, a tensile load exceeding the load resistance is applied to the belt sling 2. Can be easily detected.

  Next, FIG. 12 shows a fourth embodiment of a belt sling with an overload warning device of the present invention. In addition, in this embodiment, the same code | symbol is attached | subjected about the member same as the 1st-3rd embodiment, and the description is abbreviate | omitted.

  The belt sling 70 with an overload warning device of the present embodiment includes a belt sling 2 in which a slit 5 is formed along a direction in which a tensile load is applied, and a tensile load that is inserted into the slit 5 and acts on the belt sling 2. And an overload warning device 71 that issues a warning when the pressure in the closing direction when the slit 5 is closed exceeds a predetermined magnitude. This overload warning device 71 includes a container 73 in which a liquid 72 is sealed and a color developing body 75 that permeates the liquid 72 and develops color, and the slit 5 is closed in accordance with a tensile load acting on the belt sling 2. When the pressure in the closing direction at that time exceeds a predetermined size, at least a part of the container 73 is damaged, and the liquid 72 leaking from the damaged portion penetrates into the coloring body 75. Yes.

  As shown in FIG. 12, the overload warning device 71 includes a container 73 made of, for example, a plastic bag in which an acidic liquid 72 is sealed, and a cylindrical housing having openings 74 a and 74 b at both ends and housing the container 73. It comprises a body 74 and a color body 75 made of litmus paper that closes the openings 74a and 74b and develops color when the liquid 72 penetrates. In this embodiment, an example in which the acidic liquid 72 is sealed in the container 73 will be described. However, the container 73 may be filled with an alkaline liquid. In this case, a litmus paper that reacts with an alkaline liquid may be used as the color former 75. In addition, the liquid sealed in the container 73 may be colored water. In this case, a paper that is highly permeable and that can make its color stand out when colored water penetrates may be used as the color former 75. For example, when the colored water is black, the color of the paper used as the color former 75 is preferably white.

  A part of the container 73 is bonded to the inner peripheral surface 74c of the container 74 with an adhesive. Further, on the surface of the container 73 accommodated in the container 74, a semicircular cutout 73a is formed at a location facing the openings 74a and 74b. Therefore, since only the thickness of that portion is thinner than the thickness of the other portions, the container 73 will burst from the portion of the notch 73a when compressed.

  The overload warning device 71 is used by being inserted into the slit 5 so that the outer peripheral surface 74 d of the container 74 faces the back surface 2 a of the belt sling 2 and the openings 74 a and 74 b are exposed from the slit 5. A part of the outer peripheral surface 74d of the container 74 and the back surface 2a of the belt sling 2 are fixed by a fixing means such as an adhesive. That is, the belt sling 2 and the overload warning device 71 are integrated.

  The container 74 functions as a detection unit that detects whether or not the pressure in the closing direction when the slit 5 is closed due to the tensile load acting on the belt sling 2 exceeds a predetermined magnitude. Is. That is, in the container 74, the pressure in the closing direction when the slit 5 is closed in accordance with the tensile load acting on the belt sling 2 is less than a predetermined size with respect to the outer peripheral surface 74d of the container 74. , That is, a tensile load less than the load resistance of the belt sling 2 acts on the belt sling 2, and the closing direction when the slit 5 is closed in accordance with the tensile load (broken arrow A in FIG. 12). Direction) is acting on the outer peripheral surface 74d of the container 74, while the liquid 72 is kept sealed in the container 73, the tensile load exceeding the load resistance of the belt sling 2 is applied to the belt sling. 2, and when the pressure in the closing direction when the slit 5 is closed with this load is applied, the container 73 is crushed, thereby compressing the container 73 and cutting it out. Rupturing the part of 3a. When the container 73 is ruptured from the notch 73a, the liquid 72 is ejected therefrom and penetrates into the coloring body.

  When the lifting operation is performed using the belt sling 70 with the overload warning device configured as described above, the container 74 is compressed by the pressure in the closing direction of the slit 5. When the pressure eventually exceeds a predetermined size, it is crushed. Along with this, the container 73 is also compressed and ruptured from the notch 73a. Then, when the liquid 72 ejected from the ruptured portion permeates the color body 75, the color body 75 is colored. By visually recognizing that the color body 75 is colored, the operator has confirmed that the pressure in the closing direction of the slit 5 has exceeded a predetermined magnitude, that is, the belt sling 2 has been subjected to a tensile load exceeding the load resistance. It can be easily detected.

  The above-described embodiment is an example of a preferred embodiment of the present invention, but is not limited thereto, and various modifications can be made without departing from the scope of the present invention. For example, in the first embodiment described above, the operator is informed that the tensile load applied to the belt sling 2 exceeds the load resistance of the belt sling 2 by both the light emission of the blue LED 21 and the alarm sound from the speaker 22. However, it is sufficient to activate at least one of the blue LED 21 and the speaker 22. In the first embodiment, the light emission of the blue LED 21 is used as the light emission for warning. However, the light emission color can be appropriately changed as long as it can be differentiated from the light emission color of the LED of the operation state confirmation means 17. .

  In the first embodiment, the urging members 8 and 9 are plate springs. However, instead of the plate springs, compression coil springs may be used. In this case, a moving member that moves along with the elastic deformation of the compression coil spring is provided, and the first and second push-type switches 11 and 12 may be turned on with this moving member.

  In the second embodiment, the cork stoppers 34b and 35b are press-fitted into the openings 33a and 33b. However, the openings 33a and 33b are closed with the lids 34 and 35 by using the fitting of the concave and convex portions. Also good. In this case, when the cylinder 33 is crushed, the concave and convex fitting state is released by the compressed air in the hollow body 32 so that the lids 34 and 35 are removed from the openings 33a and 33b.

  In the second embodiment, the hollow body 32 is composed of the cylinder 33 having the openings 33a and 33b at both ends and the lid bodies 34 and 35 that close the openings 33a and 33b. However, as shown in FIG. Instead of the cylindrical body 33, which is the main body portion 32, a rectangular column body 76 having both ends penetrating is used, and instead of the lid bodies 34 and 35, the lid bodies 77 and 78 are used to close the openings at both ends of the square column body 76. The body 32 may be configured. Further, the hollow body 32 is configured by using an ellipsoid 79 having both ends penetrating instead of the cylinder 33 and using lids 80 and 81 that close the openings at both ends of the ellipsoid 79 instead of the lids 34 and 35. Also good. As described above, the hollow body 32 is crushed when a tensile load exceeding the load resistance of the belt sling 2 acts on the belt sling 2 and a pressure in the closing direction when the slit 5 is closed along with the tensile load acts. The configuration of the hollow body 32 can be changed as appropriate as long as the hollow body 32 includes a main body portion and a lid body that is released from the opening of the main body portion by compressed air in the hollow body 32.

  In the second embodiment, the hollow body 32 is composed of a cylinder 33 having openings 33a and 33b at both ends and lid bodies 34 and 35 that close the openings 33a and 33b. However, the hollow body 32 may be composed of a bottomed cylinder 82 and a lid 83 that closes the opening 82a of the cylinder 82, as shown in FIG. In this case, the coil plug 84 is integrally attached to the lid 83, and the inside of the hollow body 32 is sealed by pressing the coil plug 84 into the opening 82a. Further, the coil plug 84 and the inner peripheral surface 82 b of the cylinder 82 are connected by the connecting member 36. The hollow body 32 configured as described above is inserted into the slit 5, and the outer peripheral surface 82c of the cylinder 82 is fixed to the back surface 2a of the belt sling 2 by a fixing means such as an adhesive. Therefore, the cylinder 82 is crushed when a tensile load exceeding the load resistance of the belt sling 2 acts on the belt sling 2 and a pressure in the closing direction when the slit 5 is closed along with the tensile load acts. . And the cork stopper 84 is fired from the opening 82a by the air compressed in the hollow body 32 with this crushing. At this time, a firing sound is emitted. The operator can recognize that the tensile load has exceeded the load resistance by listening to the firing sound and visually recognizing that the lid 83 is removed from the opening 82a. Further, when the lid 83 is removed from the opening 82a, the lid 83 is suspended from the opening 82a by the connecting member 36, so that the operator does not overlook that the lid 83 has been removed from the opening 82a. . Further, even if the lid 83 is removed from the opening 82a, the lid 83 removed from the opening 82a by the connecting member 36 is separated from the cylinder 82 only within a certain range, so that the lid 83 can be prevented from scattering. .

  In the third embodiment, the protruding members 46 and 47 are pushed out of the base 43 using the wedge-shaped portions 59 and 60. However, the protruding member 46 is one of the wedge-shaped portions 59 and 60. , 47 may be pushed out of the base 43. In this case, the base ends of the protruding members 46 and 47 may be pressed by the two inclined surfaces opposite to each other in either one of the wedge-shaped portions 59 and 60 to push the protruding members 46 and 47 out of the base 43. .

  In the fourth embodiment, the container 73 is accommodated in the accommodating body 74 and then inserted into the slit 5. However, the container 73 is not accommodated in the accommodating body 74 and the container 73 is directly inserted into the slit 5. You may do it. In this case, the container 73 is notched when a tensile load exceeding the load resistance of the belt sling 2 acts on the belt sling 2 and a pressure in the closing direction when the slit 5 is closed due to the tensile load acts. What is necessary is just to be comprised so that it may burst from 73a. Then, the notch 73a is exposed from the slit, and the notch 73a exposed from the slit may be covered with the color body 75.

  In the first to fourth embodiments, the overload alarm devices 6, 31, 41, 71 are inserted into the slit 5, and each overload alarm device is fixed to the back surface 2a of the belt sling 2 with a fixing means such as an adhesive. As described above, each of the overload warning devices 6, 31, 41, 71 inserted into the slit 5 is detachably attached to the back surface 2a of the belt sling 2 using, for example, Velcro (registered trademark) or the like. You may do it.

  In the first to fourth embodiments, the slit 5 is formed so as to penetrate the belt sling 2 in the width direction, and the overload warning devices 6, 31, 41, 71 are inserted and fixed in the slit 5. However, the slit 5 may be formed so as to penetrate the belt sling 2 in the thickness direction, and the overload warning devices 6, 31, 41, 71 may be inserted and fixed in the slit 5.

It is a disassembled perspective view which shows the belt sling with an overload warning apparatus of the 1st Embodiment of this invention. It is a front view which shows the structure of the principal part in the belt sling with an overload warning apparatus. It is a perspective view which shows the external appearance of the overload alarm apparatus main body. It is a block diagram which shows the electrical structure of the overload warning apparatus main body. It is a flowchart which shows the flow of a process when operating an alarm means. It is a perspective view which shows the external appearance of the hollow body in the belt sling with an overload warning apparatus of 2nd Embodiment. It is a longitudinal cross-sectional view which shows the structure of a hollow body. It is a side view of the belt sling with an overload warning apparatus which shows a mode when a cover body remove | deviates from opening. It is a top view which shows the structure of the elastic deformation body in the belt sling with an overload warning apparatus of 3rd Embodiment. It is a perspective view which shows the external appearance of a part of base and a protrusion member. It is a longitudinal cross-sectional view of a part of an elastic deformation body showing a mode in which a protruding member is pulled into a long groove by a tension coil spring. It is the cross-sectional view of the slit part in the belt sling with an overload warning device of 4th Embodiment, and the longitudinal cross-sectional view of an overload warning device. It is a perspective view which shows another form of the hollow body in 2nd Embodiment. It is a perspective view which shows another form of the hollow body in 2nd Embodiment. It is a longitudinal cross-sectional view which shows another form of the hollow body in 2nd Embodiment.

Explanation of symbols

1, 30, 40, 70 Belt sling with overload warning device 2 Belt sling 5 Slit 6, 31, 41, 71 Overload warning device 8, 9 Biasing member 18 Alarm means 32 Hollow body 33a, 33b, 82a Opening 34, 35, 77, 78, 80, 81, 83 Lid 36 Connecting member 42 Elastic deformation body 46, 47 Protruding member 59, 60 Wedge-shaped part 72 Liquid 73 Container 75 Coloring body

Claims (6)

  A belt sling in which a slit is formed along a direction in which a tensile load is applied, and a pressure in a closing direction when the slit is closed in accordance with the tensile load inserted into the slit and acting on the belt sling is determined in advance. A belt sling with an overload alarm device, characterized by comprising an overload alarm device that issues an alarm when a specified size is exceeded.   The overload warning device includes an urging member that elastically urges toward the opening direction of the slit, and at least an alarm sound and light triggered by the elastic deformation of the urging member to a predetermined position. The belt sling with an overload warning device according to claim 1, further comprising warning means for emitting either one of them.   The overload warning device is a hollow body having an opening exposed from the slit and a lid for closing the opening, and the pressure acts on the hollow body at a predetermined size or less. The lid is closed to seal the hollow body, and when the pressure is applied to the hollow body beyond the predetermined size, the hollow body is compressed and the hollow body is compressed. The belt sling with an overload warning device according to claim 1, wherein the lid is removed from the opening by air compressed in the body.   In the hollow body, the openings are formed one by one in positions facing each other, the lid bodies closing the openings are connected by a connecting member, and when the lid body is removed from the opening, the lid body The belt sling with an overload warning device according to claim 3, wherein the belt is suspended from the opening by the connecting member.   The overload warning device is provided in an elastic deformation body that elastically deforms in the closing direction when the pressure is applied, and in the elastic deformation body. A wedge-shaped portion that moves in the direction, and the pressure acts on the elastic deformable body in the closing direction to exceed the predetermined size, whereby the inner portion is moved along with the movement of the wedge-shaped portion in the closing direction. The belt sling with an overload warning device according to claim 1, further comprising a projecting member projecting outward from the outside. The overload warning device includes a container in which a liquid is sealed and a color former that develops color when the liquid permeates, and at least a part of the container when the pressure exceeds the predetermined size. The belt sling with an overload warning device according to claim 1, wherein the liquid leaking from the damaged portion penetrates into the color former.

Images