Locking state detection device

Abstract

To provide a locking state detection device of a hook which can detect a locking state even when moving in a state where the hook is locked.SOLUTION: A locking state detection device 2 provided in a hook 1 having a hook part 11 locked to a locking object part 8 such as a single pipe and a main rope and a slip-off prevention device 13, comprises: a first optical sensor 30a which uses the vicinity of an inner edge upper portion of the hook part 11 as a first detection region 33a; and a second optical sensor 30b which uses the vicinity of an inner side center of the hook part 11 with respect to the vicinity of the inner edge upper portion of the hook part 11 as a second detection region 33b. The first optical sensor 30a detects that the work is being performed in the locking state, and the second optical sensor 30b which can detect the second detection region 33b detects that the hook 1 is moved in the floating state in the locking state.SELECTED DRAWING: Figure 6

Description

【Technical Field】 【0001】 The present invention relates to a locking state detection device used for a hook of a safety belt, and more particularly, to a locking state detection device capable of detecting a state in which work is being performed with the hook locked to a single pipe, a main rope, etc., or a state in which the work location is being moved. 【Background Art】 【0002】 Generally, when a worker performs work at a high place, it is obligatory to attach a safety belt to the body and work. This safety belt is formed by attaching hooks to both ends of a main rope. One hook is attached to the harness side of the worker, and the other hook is attached to a single pipe or a main rope at the work site so as to prevent the worker from falling. 【0003】 By the way, when the worker attaches and uses the safety belt in this way, some workers may work without attaching the hook of the safety belt to a single pipe or the like, so the danger cannot be avoided. 【0004】 Therefore, in order to be able to detect whether or not the hook is locked to a single pipe or the like, a device having a locking state detection function has been proposed. 【0005】 For example, in Patent Document 1 below, there is a locking state detection device that is detachably attached to a hook. When the hook is locked to a single pipe or the like, a lever-shaped member provided on the inner upper edge of the hook is rotated, and a pressure sensor provided in the rotation region can detect the "locking state". Also, in Patent Document 2 below, an optical sensor having a detection region near the upper part of the inner edge of the hook is provided, and when the hook part is locked to a single pipe or the like, the "locking state" can be detected by the light shielding of the optical sensor. 【Prior Art Documents】 【Patent Documents】 【0006】 [Patent Document 1] Japanese Patent Publication No. 2011-104339 [Patent Document 2] Japanese Patent Publication No. 2020-192077 [Overview of the project] [Problems that the invention aims to solve] 【0007】 However, the structure described above has the following problems. 【0008】 In other words, when working at heights, workers typically secure the hook to a pipe or similar structure while working. When moving from one work area to another, the hook remains secured to the pipe or lifeline. However, if the hook is in contact with the pipe or other structure during such movement, it can produce unpleasant metallic noises and vibrations. Therefore, workers often move with the hook suspended from the pipe or structure. However, when moving with the hook suspended in this manner, the pressure sensor on the lever-shaped member of the hook does not activate in configurations that include a pressure sensor, as shown in Patent Document 1. Furthermore, even in configurations that include an optical sensor, as shown in Patent Document 2, the pipe or other structure may move out of the detection area, making it impossible to detect the secured state. 【0009】 Therefore, the present invention has been made in view of the above problems, and aims to provide a hook locking state detection device that can detect the locking state even when the hook is moving while floating. [Means for solving the problem] 【0010】 In other words, the present invention aims to solve the above problems, The main rope or pipe that is the part to be secured A hook comprising a hook portion that is locked to the locked portion, and a retaining device that covers an opening portion for locking the hook portion to the locked portion in an openable and closable manner, thereby preventing the hook portion from coming off the locked portion. and,A first optical sensor whose first detection area is near the upper inner edge of the hook portion, and a second optical sensor whose second detection area is near the inner center of the hook portion, rather than near the upper inner edge of the hook portion. A locking state detection device comprising a detection means for detecting whether the hook is in a locked state, outputs information to the effect that if the first light sensor is in a light-shielding state and the second light sensor is in a light-transmitting state for a certain period of time or longer, the hook is in a locked state to the main rope during work; if the state in which the first light sensor is in a light-transmitting state and the second light sensor is in a light-shielding state is repeated within a certain period of time, the hook is in a locked state to the main rope during movement; if both the first and second light sensors are in a light-shielding state for a certain period of time or longer, the hook is in a locked state to a pipe during work; and if the second light sensor is in a light-shielding state and the state in which the first light sensor is in a light-transmitting state and the state in which the first light sensor is in a light-shielding state are repeated within a certain period of time, the hook is in a locked state to a pipe during movement. That is what happened. 【0011】 With this configuration, the first optical sensor can detect when the device is working in a locked state, and the second optical sensor can detect when the hook is moving while floating. Furthermore, even when the swaying during walking causes the scaffolding or main rope to move back and forth within the second detection area, it becomes possible to detect that it is moving while locked in place. 【0012】 Furthermore, if a detection means is provided to detect whether or not it is in a locked state, If only the second light sensor detects a light-shielding state for a certain period of time, it outputs information indicating that the hook is being held in the hand. 【0013】 With this configuration, it becomes possible to detect situations where the hook portion is being held by a hand in a way that covers the second light sensor. [Effects of the Invention] 【0014】 According to the present invention , the A first optical sensor can detect when the device is being operated in a locked state, and a second optical sensor can detect when the hook is being lifted and moved while it is locked. [Brief explanation of the drawing] 【0015】 [Figure 1] Figure showing a hook in one embodiment of the present invention. [Figure 2] A perspective view showing the hook with the cover attached in the same configuration. [Figure 3] Deconstructed view showing the cover body in the same configuration. [Figure 4] This diagram shows the recess in the inner curved portion of the cover body and the transparent member in the same configuration. [Figure 5] Side view of the BB with the cover attached in the same configuration. [Figure 6] Diagram showing the hook attached to the main rope in the same configuration. [Figure 7]Diagram showing the state where the hook in the same form is locked to a single pipe [Figure 8] Diagram showing the light-shielded state and working state of the optical sensor in the same form [Figure 9] Diagram showing the cover body indicating another embodiment [Figure 10] Diagram showing the state where the cover body indicating another embodiment is attached to the hook [Figure 11] Diagram showing the usage state of the system having a safety belt 【Mode for Carrying Out the Invention】 【0016】 Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 【0017】 As shown in FIG. 11, the locking state detection device 2 of the hook 1 in this embodiment is used by being carried by a worker who works at a high place, and is attached to the hook portion 11 that constitutes the hook 1 as shown in FIG. 1. As shown in FIGS. 2 and 3, this locking state detection device 2 includes a cover body 20 and a locking state detection unit 3 provided on the cover body 20 for detecting whether the hook 1 is locked to a locked portion 8 (see FIG. 11) such as a single pipe or a main rope. And, characteristically, as shown in FIGS. 6 and 7, the first detection region 33a of the first optical sensor 30a that constitutes the locking state detection unit 3 is provided so as to detect the vicinity of the upper part of the inner edge 12 of the hook portion 11 as the detection region, and the second detection region 33b of the second optical sensor 30b is set to the vicinity of the center inside the hook portion 11 as the detection region, so that it is possible to detect that "working in the locked state" or "moving in the locked state". Hereinafter, this embodiment will be described in detail. In the description of the embodiment, in the state where the hook 1 is locked to a single pipe or the like and suspended by its own weight, the upper side of the portion where the locked portion 8 contacts the vicinity of the upper part of the inner edge is described, and the front side of the paper surface in FIG. 1 is described as the "surface" side of the outer cover. 【0018】 The hook 1 to which this locking state detection device 2 is attached constitutes the lanyard of a safety harness. As shown in Figure 1, it is composed of a hook-shaped plate-shaped hook portion 11, a retaining device 13 that opens and closes the opening S of the hook portion 11, and a safety device 14 to prevent the retaining device 13 from opening unexpectedly. When locking the hook 1 to a locking portion 8 such as a pipe, the retaining device 13 and the safety device 14 are held simultaneously, and the retaining device 13 is rotated into the inner opening area of ​​the hook portion 11 (dashed line in Figure 1) to lock the hook portion 11 to the locking portion 8. After the hook portion 11 is locked to the locking portion 8, the retaining device 13 and the safety device 14 are returned to their original positions by the force of a spring (not shown), and the retaining device 13 is locked to the safety device 14, thereby preventing the retaining device 13 from opening unexpectedly. 【0019】 As shown in Figure 2, the cover body 20 attached to the hook 1 is constructed by fitting a front cover 21 and a back cover 22 together, and is attached via a band 24 while resting on the surface side of the hook portion 11. The cover body 20 is equipped with a locking state detection unit 3, a power supply unit 4, a transmission unit 5, etc., so that it can transmit signals indicating that the hook 1 is locked to the locking portion 8 to an external center device 7 (Figure 11). 【0020】 The cover body 20 is configured to conform to the curved shape of the hook portion 11. As shown in Figure 4, the inner curved portion is provided with left and right walls 34 to form a recessed area 34a that is recessed inward. A hole 35 that allows light from the first and second light sensors 30a and 30b to pass through is provided at the bottom of the recess 34a. A transparent material 36, such as a transparent film, as shown in Figure 3 is attached along the bottom of the recess 34a to prevent damage to the transparent material 36 and to prevent dust from adhering to the hole 35. 【0021】 The locking state detection unit 3 provided on the cover body 20 is designed to detect the locking state of the hook 1, and is configured to include a first optical sensor 30a and a second optical sensor 30b. 【0022】 Of these, the first light sensor 30a is provided such that the area near the upper inner edge 12 of the hook portion 11 is the first detection area 33a, as shown in Figures 6 and 7, and the light-emitting portion 31a and light-receiving portion 32a are provided so that they have a horizontal optical axis that straddles the vertical axis center line of the hook portion 11. When the hook 1 is locked to the locking portion 8, the locking portion 8 blocks the light, allowing detection that it is in a "locked state". 【0023】 On the other hand, the second light sensor 30b is configured such that its second detection area 33b is closer to the center of the hook portion 11 than the first detection area 33a, and it comprises a light-emitting part 31b provided near the light-emitting part 31a of the first light sensor 30a, and a light-receiving part 32b provided near the opening S of the hook portion 11. The optical axis of this second light sensor 30b is directed downward within a range of 10 to 20 degrees (preferably 15 degrees) relative to the optical axis of the first light sensor 30a. By changing the angle of the optical axis in this way, the area in which the locked state can be detected is widened, and the light is not blocked by the anti-dislodgement device 13 when the anti-dislodgement device 13 is rotated, and the light is not blocked even when the base of the hook portion 11 is grasped by hand. 【0024】 When detecting the locking state using the first optical sensor 30a and the second optical sensor 30b provided in this manner, if the hook 1 is locked to the ring 81 of the harness (see Figure 11) and moved, the light may be blocked by the ring 81, potentially leading to a false detection that the hook 1 is locked to a main rope or pipe. Therefore, a magnet 61 is attached to the ring 81 of the harness to detect when the hook 1 is attached, and a device for detecting the magnet 61 is provided on the cover body 20 on the hook 1 side. When the magnet 61 and the hook 1 are within a certain distance of each other, the system assumes that the hook 1 is attached to the body and stops the function of the locking state detection unit 3. 【0025】 Furthermore, the cover body 20 is equipped with a power supply unit 4, which can supply power to the locking state detection unit 3 and the transmission unit 5, etc. When the hook 1 separates from the magnet 61, the locking state detection unit 3 is activated, and the locking state and other information are wirelessly output to the central device 7 via the transmission unit 5. When transmitting this information to the central device 7, the operator may output a signal via Bluetooth® or the like to a wireless terminal device 71 such as a smartphone, and then output the information from that wireless terminal device 71 to the central device 7. 【0026】 The central device 7 records the locking status detected by the first optical sensor 30a and the second optical sensor 30b in chronological order. Specifically, it records states such as "unlocked," "working while locked to the main rope," "working while locked to the pipe," and "moving while locked" in chronological order. If the "unlocked" state is detected for a certain period of time or longer, the device alerts the worker via a smartphone or similar device. 【0027】 Next, we will explain the operation when working with the hook 1 equipped with the locking state detection device 2 configured in this way. 【0028】 First, as the worker is on their way to the work site, they attach the hook 1 to the ring 81 of the harness. At this time, because the magnet 61 on the body side and the hook 1 are close together, the locking state detection unit 3 enters a stopped state and does not output a signal indicating whether or not it is locked. 【0029】 When a worker arrives at the site and begins work, they detach the hook 1 that was attached to the harness ring 81. This causes the hook 1 to separate from the magnet 61, and the locking state detection unit 3 becomes activated. Under these conditions, when the worker locks the hook 1 to a locking part 8 such as a pipe or main rope, the locking part 8, such as the main rope or pipe, comes into contact with the vicinity 12 of the upper inner edge of the hook 1, as shown in Figures 6 and 7. As a result, the locking part 8 blocks light from the first detection area 33a of the first light sensor 30a, and the "locked state" is detected. Furthermore, when the locking portion 8 is secured to a main rope with a small diameter, only the first detection area 33a is shielded from light. On the other hand, when it is secured to a single pipe with a large diameter, both the first detection area 33a and the second detection area 33b are shielded from light. Therefore, the type of locking portion 8 to which the device is secured can be determined by the shielding state of the first light sensor 30a and the second light sensor 30b. 【0030】 These status signals are then transmitted to the center device 7 via the transmission unit 5 and wireless terminal device 71 to record the work status. At this time, as shown in Figure 8, if both the first light sensor 30a and the second light sensor 30b are transmitting light for a certain period of time or longer (state 1), it is determined to be in an "unlocked state," and if the first light sensor 30a is in a light-shielding state and the second light sensor 30b is transmitting light for a certain period of time or longer (state 2), it is determined to be in a "locked state to the main rope while working." On the other hand, within a certain period of time, the first light sensor 30a A state in which the first light sensor 30a is in a light-shielding state and the second light sensor 30b is in a light-transmitting state (state 2), and a state in which the first light sensor 30a is in a light-transmitting state and the second light sensor 30b is in a light-shielding state (state 3). If this is repeated, it is determined that the vehicle is "moving while tethered to the main rope," and if the first light sensor 30a and the second light sensor 30b are in a light-shielding state for a certain period of time or longer (state 4), it is determined that the vehicle is "tethered to the single pipe." In stateIt is determined that "work is in progress." Also, if the second light sensor 30b is in a light-shielded state, and the first light sensor 30a alternates between a light-transmitting state and a light-shielded state within a certain period of time, (Repeating between state 3 and state 4) It is determined that the vehicle is "moving while secured to a scaffolding pipe." 【0031】 These states are then recorded in chronological order, and if, for example, a "non-locked state" is detected more than a certain number of times within a certain period of time, it is determined that the locking is not being performed properly, and a warning is issued. At this time, if transmission and reception with the central device 7 is performed via a wireless terminal device 71 such as a smartphone, the wireless terminal device 71 is made to emit an alarm sound. 【0032】 Thus, according to the above embodiment, The main rope or pipe that is the locking part 8 A hook 1 comprises a hook portion 11 that is locked to the locking portion 8, and a retaining device 13 that can open and close to cover the opening portion for locking the hook portion 11 to the locking portion 8, thereby preventing the hook portion 11 from coming off the locking portion 8. and, A first optical sensor 30a has a first detection area 33a near the upper inner edge of the hook portion 11, and a second optical sensor 30b has a second detection area 33b near the inner center of the hook portion 11, rather than near the upper inner edge of the hook portion 11. A locking state detection device 2, comprising a detection means for detecting whether the hook 1 is in a locked state, outputs information to the effect that if the first light sensor 30a is in a light-shielding state and the second light sensor 30b is in a light-transmitting state for a certain period of time or longer, the hook 1 is in a locked state and working; if the state of the first light sensor 30a being in a light-transmitting state and the second light sensor 30b being in a light-shielding state is repeated within a certain period of time, the hook 1 is in a locked state and moving; if both the first light sensor 30a and the second light sensor 30b are in a light-shielding state for a certain period of time or longer, the hook 1 is in a locked state and working; and if the second light sensor 30b is in a light-shielding state and the state of the first light sensor 30a being in a light-transmitting state and the state of light-shielding state are repeated within a certain period of time, the hook 1 is in a locked state and moving. Therefore, the first optical sensor 30a can detect that work is being performed while the device is locked, and the second optical sensor 30b can detect that the hook 1 is being lifted and moved while the device is locked. 【0033】 The present invention is not limited to the embodiments described above and can be implemented in various ways. 【0034】 For example, in the above embodiment, a first optical sensor 30a and a second optical sensor 30b are provided as optical sensors, but three or more optical sensors may be provided. In this case, if the direction of the optical axis of each optical sensor is changed, it will be possible to detect various operations. 【0035】 Furthermore, in the above embodiment, the locking state is detected by an optical sensor, but an acceleration sensor, gyro sensor, geomagnetic sensor, load sensor, etc. may be used in combination to detect the locking state, movement state, etc. 【0036】 Furthermore, in the above embodiment, the optical axis of the second light sensor 30b is directed downwards by approximately 10 to 20 degrees relative to the first light sensor 30a, but its optical axis may also be directed in an up-and-down direction perpendicular to the first light sensor 30a. 【0037】 Furthermore, in the above embodiment, the first light sensor 30a and the second light sensor 30b are attached to the cover body 20, but they may also be attached directly to the hook 1. 【0038】 Furthermore, in the above embodiment, the locking state is detected on the hook 1 side, but it is also possible to transmit only the light-shielding state to the center device 7 side, and have the locking state detection unit 3 provided on the center device 7 side detect the "locking state" and so on. 【0039】 Furthermore, in the above embodiment, the locking state detection unit 3 is used to determine whether the device is "operating in a locked state" or "moving in a locked state." However, it is also possible to output only the state of the first optical sensor 30a or the state of the second optical sensor 30b, allowing a human to determine the state in which the device is operating. 【0040】 Furthermore, in the above embodiment, the cover body 20 is placed on the surface side of the hook portion 11 and fixed to the hook portion 11 with a metal band 24. However, as shown in Figures 9 and 10, the upper cover 21a may be sandwiched from the upper edge of the hook portion 11, and the lower cover 22a may be sandwiched from the lower edge of the hook portion 11 and fixed with a band 24a made of rubber or the like. In this case, when fixing with a band 24a, the band 24a is attached to a projection 23 provided on the surface of the lower cover 22a and attached so as to wrap around the upper cover body 21. [Explanation of Symbols] 【0041】 1. Hook 11...Hook part 12. Inner edge 13. Anti-detachment device 14...Safety device 2. Locking status detection device 20...cover body 21(21a)···Front cover (upper cover) 22(22a)···Back cover (bottom cover) 23...protrusion 24, 24a...band 3. Locking state detection unit 30a...First light sensor 30b...Second light sensor 31a, 3 1 b...light-emitting part 32a, 3 2 b... Light receiving section 33a...First detection area 33b...Second detection area 34...wall 34a...recess 35...Hole 36... Transparent component 4...Power supply section 5. Transmitter 6. Mounting detection unit 61... Magnet 7. Center device 8...Locked part

Claims

[Claim 1] A hook portion that is attached to a main rope or pipe which is the part to be attached, A hook comprising: an opening for engaging the hook portion with a locking portion, which can be opened and closed to cover the opening portion, and a retaining device to prevent the hook portion from coming off the locking portion; A first optical sensor having the vicinity of the upper inner edge of the hook portion as the first detection area, A second optical sensor, which has a second detection area near the inner center of the hook portion rather than near the upper inner edge of the hook portion, A detection means for detecting whether the hook is in a locked state, In a locking state detection device equipped with, If the first light sensor is in a light-shielding state and the second light sensor is in a light-transmitting state for a certain period of time or longer, it indicates that the hook is engaged in operation while attached to the main rope. If, within a certain period of time, the state in which the first light sensor is transparent and the second light sensor is blocked from light, and the state in which the first light sensor is blocked from light and the second light sensor is transparent are repeated, it indicates that the hook is moving while attached to the main rope. If the first and second light sensors are in a light-shielded state for a certain period of time or longer, it indicates that the hook is engaged with the pipe and is in operation. A locking state detection device characterized in that, if the second light sensor is in a light-shielding state and the first light sensor alternates between a light-transmitting state and a light-shielding state within a certain period of time, it outputs information indicating that the hook is moving while locked to the pipe. [Claim 2] The locking state detection device according to claim 1, wherein the detection means outputs information indicating that the hook is being held by hand when only the second light sensor detects a light-shielding state for a certain period of time.

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