Anti-loosening device and passenger conveyor

Abstract

Provided is an anti-loosening device capable of preventing loosening of a bolt that fixes a step of a passenger conveyor. A bracket has a first face fixed to a bearing by a bolt and a second face erected on the first face. A plurality of recesses are formed on an inner peripheral face of a rotation-stopping portion so as to be capable of being fitted to the bolt at a prescribed angle in a rotation direction of the bolt. A curved face is formed on an outer peripheral face of the rotation-stopping portion so as to abut against the second face when the anti-loosening device is fitted to the bolt in a manner in which the second face faces the bolt.

Description

Technical Field

[0001] This invention generally relates to a technique for preventing the bolts securing the steps of a passenger conveyor from loosening. Background Technology

[0002] Previously, during the installation and maintenance of passenger conveyors, operators disassembled, assembled, and adjusted the constituent components. In this work, operators loosened or tightened bolts, which are known as rotating fasteners. When performing this type of work, appropriate tools were used to secure the bolts with controlled tightening force.

[0003] However, for example, the steps of a passenger conveyor vibrate continuously when it is running and when passengers get on and off the elevator. As a result, there is a problem that the bolts gradually loosen, leading to a decrease in the fixing force of the components.

[0004] In this regard, a relaxation prevention component for a rotary fastener used to maintain a fixing force has been proposed (see Patent Document 1).

[0005] Existing technical documents

[0006] Patent documents

[0007] Patent Document 1: Japanese Utility Model Registration No. 3104843 Summary of the Invention

[0008] The problem that the invention aims to solve

[0009] In the technology described in Patent Document 1, the part that prevents the rotational force generated in the loosening direction of the bolt is an anti-rotation plate with a thin-walled portion that flexes when hooked and installed on the component. Therefore, if the thin-walled portion is greatly deformed or damaged due to the rotational force, it may not be able to fully function as an anti-loosening component.

[0010] The present invention was made in view of the above problems, and its purpose is to provide an anti-loosening device, etc., that can prevent the bolts fixing the steps of a passenger conveyor from loosening.

[0011] Methods for solving problems

[0012] To address the aforementioned issues, this invention provides an anti-loosening device that can be installed on bolts used to secure bearings and brackets of a chain, preventing the bolts from loosening. The chain drives the steps of a passenger conveyor, and the bracket is disposed within the frame of the steps. The device is characterized by having an anti-rotation portion formed in a plate shape with a through hole extending along its thickness direction. The bracket has a first surface fixed to the bearing by the bolt and a second surface vertically disposed on the first surface. Multiple recesses are formed on the inner circumferential surface of the anti-rotation portion to allow installation on the bolt at predetermined angles along the bolt's rotation direction. A curved surface is formed on the outer circumferential surface of the anti-rotation portion so that, when the anti-loosening device is installed on the bolt facing the second surface, it abuts against the second surface when the bolt rotates by an angle greater than the predetermined angle in the direction of loosening.

[0013] In the above structure, when the anti-loosening device is installed facing the second surface, when the bolt is to rotate at an angle larger than the specified angle (e.g., 20 degrees, 40 degrees, etc. when the specified angle is 15 degrees), the curved surface of the anti-rotation part abuts against the second surface. According to the above structure, for example, when the bolt rotates in the direction of loosening, the plate-shaped anti-rotation part abuts against the bracket, thus preventing the bolt from rotating (loosening).

[0014] The effects of the invention

[0015] According to the present invention, an anti-loosening device can be realized for preventing the bolts securing the steps of a passenger conveyor from loosening. Other issues, structures, and effects described above will become clear through the following description of embodiments. Attached Figure Description

[0016] Figure 1 This is a diagram illustrating an example of a passenger transport machine according to the first embodiment.

[0017] Figure 2 This is a diagram illustrating an example of the anti-loosening device according to the first embodiment.

[0018] Figure 3A This is a diagram illustrating an example of the anti-loosening device according to the first embodiment.

[0019] Figure 3B This is a diagram illustrating an example of the anti-loosening device according to the first embodiment.

[0020] Figure 3C This is a diagram illustrating an example of the anti-loosening device according to the first embodiment.

[0021] Figure 3D This is a diagram illustrating an example of the anti-loosening device according to the first embodiment.

[0022] Figure 3EThis is a diagram illustrating an example of the anti-loosening device according to the first embodiment.

[0023] Figure 4 This is a diagram illustrating the installation method of the anti-loosening device according to the first embodiment.

[0024] Figure 5 This is a diagram illustrating the installation method of the anti-loosening device according to the first embodiment.

[0025] Figure 6 This is a diagram illustrating the installation method of the anti-loosening device according to the first embodiment.

[0026] Figure 7 This is a diagram illustrating the installation method of the anti-loosening device according to the first embodiment.

[0027] Figure 8 This is a diagram illustrating the installation method of the anti-loosening device according to the first embodiment.

[0028] Figure 9 This is a diagram illustrating the method for preventing bolts from loosening according to the first embodiment.

[0029] Figure 10 This is a diagram illustrating the bolt tightening verification method of the first embodiment.

[0030] Figure 11 This is a diagram illustrating the bolt tightening verification method of the first embodiment.

[0031] Figure 12 This is a diagram illustrating an example of the anti-loosening device according to the first embodiment.

[0032] Figure 13 This is a diagram illustrating an example of the anti-loosening device according to the first embodiment.

[0033] In the diagram: 100 Passenger conveyor; 200 Anti-loosening device; 210 Anti-rotation part; 220 Anti-fall-off part. Detailed Implementation

[0034] (I) First Embodiment

[0035] Hereinafter, one embodiment of the present invention will be described in detail. However, the present invention is not limited to this embodiment.

[0036] In this embodiment, the anti-loosening device of the rotating fastening fitting installed on the steps of the fixed passenger conveyor will be described. Hereinafter, the bolt that fixes (connects) the steps of the passenger conveyor to the chain will be used as an example of the rotating fastening fitting.

[0037] In some cases, anti-loosening devices used to prevent bolts from loosening are not designed to secure the steps of a passenger conveyor. Sometimes, they are not installed with the bolts upside down relative to the ground. Therefore, the anti-loosening devices may fall off when the bolts are upside down.

[0038] Furthermore, although all bolts are tightened under the premise of being secure, since the bolt tightening operation is performed manually (manual tightening), there are occasional bolts that are tightened without the use of appropriate tools or with the appropriate tightening force, commonly known as "manually tightened bolts." For example, as with the loosening prevention component for rotary fasteners described in Patent Document 1, in structures that completely cover the bolts, there is a problem that it is impossible to distinguish whether a bolt is in a manually tightened state during or after installation.

[0039] In this regard, the anti-loosening device of this embodiment includes an anti-rotation part and an anti-detachment part integrally provided with the anti-rotation part.

[0040] The anti-rotation part includes: a recess (insertion groove) having recesses corresponding to multiple fixed angles of the fixing bolt; and an abutment having a width that abuts against the component when rotating together with the bolt. A curved surface is formed in the abutment that is set to be larger than the rotation radius (trajectory) of the anti-loosening device.

[0041] The anti-detachment part is formed as a component that clamps the passenger conveyor from the vertical or horizontal direction. Furthermore, the anti-detachment part is an elastic body that functions to stop the rotation of the bolt by abutting (contacting) with the component. For example, as a component that clamps the passenger conveyor from the vertical direction, the anti-detachment part may have: a stepped portion for providing space to avoid a spring washer that is fixed together with the bolt; and a locking portion (stop end) that is adjusted to the size when the bolt is properly fixed and is disposed at the center of the recess, with a width smaller than the thread diameter of the bolt.

[0042] In the above structure, when installing the anti-loosening device relative to a bolt fixed at an arbitrary angle, it can be easily installed using multiple recesses (insertion slots) that correspond to that angle. Even when there is a bolt fixed at an angle between the multiple recesses, the anti-loosening part made of an elastomer deforms, thus allowing the bolt to be inserted into a recess at a close angle.

[0043] Furthermore, in the above structure, for example, when a strong rotation is applied to the anti-loosening part, exceeding the elastic force and causing the anti-loosening part to deform, the abutting part of the anti-rotation part can abut against the component and prevent the bolt from rotating (loosening). Moreover, the anti-loosening part, which is made of an elastomer, is fixed by using the restoring force of the elastomer to clamp the component. Therefore, even if the component, such as the bolts that fix the steps and chains of a passenger conveyor, is constantly rotating up and down, the anti-loosening device will not fall off.

[0044] Here, the dimension between the upper surface of the anti-rotation part and the locking surface of the locking part provided in the anti-loosening part can also be the dimension when the bolt is tightened with a specified torque (tightening force). In this case, even if the bolt is equipped with an anti-loosening device in the manually tightened state, the dimension in the thickness direction of the spring washer (the difference in height between the spring washer in the fully crushed state and the spring washer in the manually tightened state) is exposed from the upper surface of the anti-rotation part, so it is possible to visually determine whether the bolt is completely tightened.

[0045] The terms "first," "second," and "third" used in this specification are for the purpose of identifying constituent elements and do not necessarily limit the number or order. Furthermore, the numbers used to identify constituent elements are used in each context; a number used in one context may not represent the same structure in other contexts. Additionally, this does not preclude a constituent element identified by a certain number from also having the functions of constituent elements identified by other numbers.

[0046] Next, embodiments of the present invention will be described based on the accompanying drawings. The following description and drawings are illustrative of the invention, and appropriate omissions and simplifications have been made for clarity. The present invention can also be implemented in various other ways. Unless otherwise specified, each component can be a single element or a plurality of elements.

[0047] Furthermore, in the following description, the same reference numerals will be used for the same elements in the accompanying drawings, and descriptions will be omitted as appropriate. Additionally, when describing elements without distinguishing between them, the common part (other than the branch number) in the reference symbol may be used; when describing elements separately, the reference symbol may include the branch number. For example, when describing sprockets without specifically distinguishing them, they may be referred to as "sprocket 130," while when describing individual sprockets separately, they may be referred to as "sprocket 130-1" or "sprocket 130-2."

[0048] exist Figure 1 In the middle, 100 represents the passenger transport of the first embodiment.

[0049] The passenger conveyor 100 is an escalator, moving walkway, etc. More specifically, the passenger conveyor 100 includes a moving handrail 110, steps 120, sprockets 130, and chains 140.

[0050] Step 120 is pivotally supported by a chain 140 connected in a ring. Upper sprocket 130-1 and lower sprocket 130-2 are wound around the chain 140. The sprocket 130 rotates under the power of a drive motor. The chain 140, along with the steps 120, circulates in tandem with the rotation of the sprocket 130.

[0051] More specifically, the step 120 includes a tread 121 for passengers to sit on and a frame 122 supporting the tread 121. A bracket 123 is provided in the frame 122. The bracket 123 has a storage space for mounting bolts 125 with spring washers 124. The bracket 123 has a bottom surface (a first surface fixed to the bearing 141 by bolts 125) that is the side opposite to the tread 121 and a side surface (a second surface) that is erected on the bottom surface. In addition, a through hole for the bolts 125 to be inserted is provided on the bottom surface of the bracket 123.

[0052] Hereinafter, bolt 125 will be described using a bolt with a regular hexagonal head as an example, but the head shape is not limited to a regular hexagon. For example, the head shape can also be a quadrilateral, octagon, or other polygon. Furthermore, bolt 125 will be described using a bolt (right-hand screw) that tightens when rotated clockwise and loosens when rotated counterclockwise as an example, but it is not limited to this. By employing a structure that reverses the right and left sides of the anti-loosening device 200 (described later) or a symmetrical structure, it can also be applied to left-hand screws.

[0053] Additionally, a step shaft (front shaft) is pivotally supported on the chain 140 at certain intervals. A bearing 141 is provided at a position symmetrical to the center of the step shaft. A threaded hole is provided in the bearing 141.

[0054] When fixing the step 120 to the bearing 141, the operator places the bracket 123 with its through hole engaging with the threaded hole of the bearing 141, and screws the bolt 125 into the threaded hole of the bearing 141 to secure the bracket 123 to the bearing 141. Thus, the step 120 is connected to the chain 140 via the step shaft. In other words, the bearing 141 on the chain 140 and the bracket 123 on the step 120 are fixed together by bolts 125.

[0055] Previously, after the operator manually tightened the bolt 125 with appropriate force, a portion of the confirmation device 126 indicating that the bolt 125 was tightened was bent. A color (e.g., red) that is easily visually identifiable by the operator was added to the bent surface 126A, thus facilitating double confirmation. Furthermore, the confirmation device 126 is, for example, a red tongue-type washer made of a metal such as aluminum with a thickness of several millimeters.

[0056] However, when an operator tries to bend the verification device 126 without properly tightening the bolt 125, the fixed state of the bolt 125 cannot be determined. Furthermore, the verification device 126 itself does not have the strength to withstand rotational forces acting in the slack direction of the bolt 125, making it difficult to manually bend if strength is ensured.

[0057] The following describes the anti-loosening device 200 used to prevent the bolts 125 of the steps 120 of the passenger conveyor 100 from loosening and to solve the problem of the unknown fixing state of the bolts 125.

[0058] Figure 2 and Figures 3A-3E This is a diagram showing an example of an anti-loosening device 200. Figure 3A This indicates the condition of the anti-loosening device 200 as observed from the top (direction 201). Figure 3B This indicates the condition of the anti-loosening device 200 as observed from the right side (direction 202). Figure 3C This indicates the condition of the anti-loosening device 200 as observed from the bottom (direction 203). Figure 3D This indicates the condition of the anti-loosening device 200 as viewed from the front (direction 204). Figure 3E This indicates the condition of the anti-loosening device 200 as observed from the back (direction 205).

[0059] The anti-loosening device 200 is, for example, installed on bolt 125, which has a bracket 123 for connecting the step 120, a component of the passenger conveyor 100, and a spring washer 124 for fixing the bearing 141. For example, the anti-loosening device 200 is an injection-molded article made of synthetic resin, formed in a generally J-shaped manner. The material of the anti-loosening device 200 is nylon (polyamide synthetic resin), ABS resin (a resin composed of acrylonitrile, butadiene, and styrene), PET (Poly ethylene terephthalate), polycarbonate, etc. Furthermore, part (e.g., the back) or all of the anti-loosening device 200 is colored in a specified color (e.g., red) to easily identify whether it is installed.

[0060] More specifically, the anti-loosening device 200 includes an anti-rotation portion 210 and an anti-detachment portion 220. The anti-rotation portion 210 is plate-shaped and has a through hole (forming a through hole extending along the thickness direction) for the bolt 125 to be inserted. The thickness of the anti-rotation portion 210 can be the same as the thickness of the head of the bolt 125.

[0061] A plurality of recesses 211 are formed on the inner circumferential surface of the anti-rotation portion 210 to allow for installation (fitting) at predetermined angles (e.g., 20 degrees, 15 degrees) at intervals along the rotation direction of the bolt 125. The recesses 211 are, for example, insertion slots, having a continuous circumferential cross-sectional shape with a number of V-shaped portions (e.g., 18 or 24) that are multiples of six. Incidentally, if the number of recesses 211 is too small, they will be difficult to fit; if there are too many, they will not be able to stop the bolt 125. Therefore, the predetermined angle is preferably around 15 degrees.

[0062] A curved surface 212 is formed on the outer peripheral surface of the anti-rotation portion 210 so that when the anti-loosening device 200 is installed facing the side of the bracket 123, it abuts against the bracket 123 when the bolt 125 rotates by an angle larger than a predetermined angle in the loosening direction. The curved surface 212 has a width 301 that allows it to contact the bracket 123 and stop when rotating together with the bolt 125 in the loosening direction. In addition, a flat portion 213 is provided on the outer peripheral surface of the anti-rotation portion 210 for clamping and removing the anti-loosening device 200 with a tool.

[0063] The anti-loosening part 220 includes a stepped part 221 and a holding part 222, which secure the anti-loosening device 200. The stepped part 221 is a portion designed to avoid the space occupied by the spring washer 124, which is fixed together with the bolt 125. For example, the stepped part 221 is connected to the anti-rotation part 210, and the anti-rotation part 210 has a height 302 in the thickness direction that is the same as the height of the spring washer 124 when the bolt 125 is tightened with a specified tightening force (the size of the state in which the bolt 125 is properly fixed and the spring washer 124 is crushed). The holding part 222 is the portion that abuts against the component of the step 120 (the bolt 125 in this example) when the anti-loosening device 200 is installed on the bolt 125. The holding part 222 has a width 303 smaller than the nominal diameter (thread diameter) of the bolt 125, and is positioned in the center of the through hole of the anti-rotation part 210 when the anti-loosening device 200 is installed on the bolt 125.

[0064] When the anti-loosening device 200 is installed on the bolt 125, the step portion 221 and the holding portion 222 are positioned to sandwich the bracket 123 and the bearing 141 from both sides of the anti-rotation portion 210 in the thickness direction.

[0065] In addition, the anti-loosening part 220 is an elastomer. When the anti-loosening device 200 is installed on the bolt 125, it can reduce the rotational force in the loosening direction by contacting the constituent parts of the ladder 120 (the bracket 123 in this example).

[0066] Next, use Figures 4-8 Instructions on how to install the anti-loosening device 200.

[0067] like Figure 4 As shown, the operator installs the anti-loosening device 200 from the opening direction 400 of the bracket 123, which provides good workability, relative to the bolt 125 that completely secures the bracket 123 to the bearing 141. Multiple recesses 211 are provided in the anti-rotation portion 210, allowing installation regardless of the orientation of the bolt 125. Therefore, the operator does not need to adjust the fixing state (angle) of the bolt 125 when installing the anti-loosening device 200.

[0068] like Figure 5As shown, the anti-loosening device 200 has an opening height 503 that indicates the height from the gripping surface 501 of the gripping portion 222 to the lower surface 502 of the anti-rotation portion 210. When the operator installs the anti-loosening device 200 onto the bolt 125, the gripping portion 222 of the anti-loosening device 200 is pressed down within its elastic range in the direction 510 that widens the opening height 503. Furthermore, the opening height 503 is described as the size of the bolt 125 in the state where the spring washer 124 is crushed, but for a more secure grip on the component, it may also be a smaller size.

[0069] like Figure 6 As shown, the operator inserts the bolt 125 into the anti-rotation part 210 and releases the holding part 222. With the bolt 125 fully secured, the spring washer 124 is compressed, becoming crushed, and the upper surface 601 of the bolt head and the upper surface 602 of the anti-rotation part 210 are on the same plane. Furthermore, when the operator releases the holding part 222, the anti-loosening device 200 returns to its opening height 503.

[0070] like Figure 7 as well as Figure 8 As shown, in the anti-loosening device 200 installed on the bolt 125, the anti-loosening part 220 (step part 221 and holding part 222) is a component that grips the bolt 125 from both sides along its axial direction. According to this structure, even if the anti-loosening device 200 is used on the bolt 125 of the step 120 which changes in the vertical direction, the anti-loosening device 200 will never fall off.

[0071] Next, use Figure 9 The structure (method) for preventing bolt 125 from loosening is described.

[0072] like Figure 9 As shown, when the bolt 125 rotates 900 in the relaxation direction, the anti-rotation part 210 also follows the rotation 900 and rotates along the trajectory 901.

[0073] During rotation 900, loosening is first prevented by the anti-loosening part 220 that contacts the bracket 123. Even when a stronger loosening force is applied to rotation 900 and the anti-loosening part 220 deforms beyond its elastic force, the curved surface 212, whose curvature is set to be larger than the trajectory 901 of the rotation radius 902 of the anti-rotation part 210, stops loosening at the contact point 903. More specifically, the curved surface 212 is formed such that when the anti-loosening device 200 is installed on the bolt 125 facing the side 904 of the bracket 123, it abuts against the side 904 of the bracket 123 when the bolt 125 rotates by an angle larger than a specified angle (e.g., 15 degrees) in the direction of loosening. By setting the surface of the anti-rotation part 210 that abuts against the bracket 123 as a curved surface 212 instead of a plane, there is room for movement (clearance), which facilitates the installation of the anti-loosening device 200.

[0074] Thus, in the anti-loosening device 200, by forming a curved surface 212 in the anti-rotation portion 210, the workability and loosening prevention performance are improved.

[0075] Here, bolt 125 is manually tightened, but it may be left in a state of incomplete tightening due to work interruptions, etc. Use Figure 10 as well as Figure 11 The method for confirming that bolt 125 is properly tightened is explained.

[0076] like Figure 10 As shown, with the bolt 125 fully secured, the dimension 1002 from the upper surface 602 of the anti-rotation portion 210 to the contact surface 1001 of the bracket 123 and the spring washer 124 is the sum of the thickness of the space (height 302 of the spring washer 124) assuming a fully compressed and crushed state, and the thickness 1011 of the anti-rotation portion 210. In this case, the dimension from the lower surface 502 of the anti-rotation portion 210 to the gripping surface 501 of the gripping portion 222 is consistent with the opening height 503.

[0077] like Figure 11 As shown, for example, bolt 125 in the manually tightened state is equipped with an anti-loosening device 200.

[0078] When the bolt 125 is in a manually tightened state, a portion of the spring washer 124 enters the anti-rotation portion 210, preventing the spring washer 124 from becoming completely crushed, thus creating a difference dimension 1101 between the spring washer 124 in its fully crushed state. In this case, relative to the dimension 1002 that does not change from the contact surface 1001, the bolt 125 protrudes from the upper surface 602 of the anti-rotation portion 210 by the same dimension as the difference dimension 1101. Furthermore, a space of difference dimension 1101 also appears between the holding portion 222 of the bolt 125 and the bottom surface of the bolt 125. Therefore, the installation status of the anti-loosening device 200 and the bolt 125 can be easily confirmed visually.

[0079] Here, in the anti-loosening device 200, the holding portion 222 of the anti-detachment portion 220 is formed in a conical shape (tapered at the front end) so as to abut against the bolt 125, but is not limited to this shape. For example, as Figure 12 as well as Figure 13 As shown, the anti-detachment part 220 can also be provided to match the shape of the bracket 123, bearing 141, etc.

[0080] like Figure 12 As shown, a wide holding portion 1200 with a width wider than the diameter of the threaded hole of the bearing 141 can also be formed in the anti-detachment portion 220.

[0081] like Figure 13 As shown, a holding portion 1300 may also be formed in the anti-drop portion 220, which has a protrusion 1301 with a threaded hole for easy insertion into the bearing 141.

[0082] According to this embodiment, an anti-loosening device for a rotary fastener can be provided, which can prevent the rotary fastener from loosening and can determine whether the rotary fastener is properly secured during installation.

[0083] (II) Notes

[0084] In the above embodiments, for example, the following content may be included.

[0085] In the above embodiments, the case where bolt 125 is a bolt with a spring washer has been described, but the present invention is not limited thereto. For example, bolt 125 may also be a bolt without a spring washer. In this case, the anti-loosening device does not have a stepped portion.

[0086] Furthermore, in the above embodiment, the case where the threaded hole of the bearing 141 is a through hole has been described, but the present invention is not limited thereto. For example, the threaded hole of the bearing 141 may also be a threaded hole (indentation, depression, etc.).

[0087] Furthermore, in the above embodiment, the case where the anti-loosening device 200 is installed on the bolt 125 has been described, but the present invention is not limited thereto. For example, it is also possible to install the anti-loosening device 200 on the bolt 125 where the confirmation device 126 is installed (the application of covering the anti-loosening device 200 on top of the confirmation device 126).

[0088] Furthermore, in the above embodiment, the case in which the recess 211 is provided on the entire inner peripheral surface of the anti-rotation portion 210 has been described, but the present invention is not limited thereto. For example, the recess 211 may also be provided on a portion of the inner peripheral surface of the anti-rotation portion 210 (e.g., the front side and back side, and the left and right side sides).

[0089] Furthermore, in the above embodiments, such as Figure 11 As shown, the case where the spring washer 124 enters the anti-rotation portion 210 when the anti-loosening device 200 is installed in the manually tightened state of the bolt 125 has been described, but the present invention is not limited thereto. For example, the shape (size) of the spring washer 124 may also be a shape (size) that does not enter the anti-rotation portion 210.

[0090] The above-described embodiments have, for example, the following characteristic structures.

[0091] (1) An anti-loosening device (e.g., anti-loosening device 200) capable of being installed on bolts (e.g., bolt 125) for securing bearings (e.g., bearing 141) and brackets (e.g., bracket 123) of a chain (e.g., chain 140) to prevent loosening of the bolts, the chain being used to drive a step (e.g., step 120) of a passenger conveyor (e.g., passenger conveyor 100), the bracket being disposed in a frame (e.g., frame 122) of the step, characterized in that,

[0092] The bracket has a plate-shaped anti-rotation part (e.g., anti-rotation part 210) with a through hole extending along the thickness direction. The bracket has a first surface (bottom surface) fixed to the bearing by the bolt and a second surface (the surface mounted on the frame 122) erected on the first surface. A plurality of recesses (e.g., recesses 211) are formed on the inner peripheral surface of the anti-rotation part so that the bolt can be installed at a predetermined angle every other rotation direction of the bolt. A curved surface (e.g., curved surface 212) is formed on the outer peripheral surface of the anti-rotation part so that when the anti-loosening device is installed on the bolt in a manner facing the second surface, it abuts against the second surface when the bolt rotates by an angle larger than the predetermined angle in the loosening direction.

[0093] In the above structure, when the anti-loosening device is installed facing the second surface, when the bolt is to rotate at an angle larger than the specified angle (for example, 20 degrees, 40 degrees, etc. when the specified angle is 15 degrees), the curved surface of the anti-rotation part abuts against the second surface. According to the above structure, for example, when the bolt rotates in the direction of loosening, the plate-shaped anti-rotation part abuts against the bracket, thus preventing the bolt from rotating (loosening).

[0094] (2) The bearing and the bracket are fixed by the bolts. The anti-rotation part is formed such that, when the anti-loosening device is installed on the bolts, the upper surface of the bolt head (e.g., upper surface 601) and the upper surface of the anti-rotation part (e.g., upper surface 602) are on the same plane (e.g., refer to...). Figure 6 ).

[0095] Based on the above structure, for example, if the bolt is only tightened halfway, the bolt head protrudes from the anti-rotation part, so the operator can easily detect if the bolt is not properly tightened.

[0096] (3) The bolt is a bolt with a spring washer (e.g., spring washer 124), and the anti-loosening device has a stepped portion (e.g., stepped portion 221), which is connected to the anti-rotation portion and has the same height in the thickness direction of the anti-rotation portion as the height of the spring washer when the bolt is tightened with a specified torque.

[0097] Based on the above structure, for example, if a bolt with a spring washer is not tightened to the specified torque, the bolt head protrudes from the anti-rotation part, so the operator can easily detect if the bolt is not tightened to the specified torque.

[0098] (4) A flat portion (e.g., flat portion 213) is provided on the outer peripheral surface of the anti-rotation portion, which is used to clamp and disassemble the anti-loosening device using a tool.

[0099] Based on the above structure, for example, when disassembling the ladder, the operator can use tools to remove the anti-loosening device, thus shortening the operation time.

[0100] (5) The aforementioned anti-loosening device includes an anti-dislodgement portion (e.g., anti-dislodgement portion 220) provided with a first locking portion (e.g., stepped portion 221) and a second locking portion (e.g., holding portion 222). The first locking portion is the stepped portion. When the aforementioned anti-loosening device is installed on the aforementioned bolt, the first locking portion and the second locking portion are arranged at a position that clamps the bracket and the bearing from both sides in the thickness direction of the aforementioned anti-rotation portion (e.g., refer to...). Figure 7 ).

[0101] Based on the above structure, for example, even in the case of step reversal, it is possible to prevent the anti-loosening device from falling off.

[0102] (6) The above-mentioned anti-loosening device is made of synthetic resin.

[0103] Based on the above structure, for example, the operator can flex the anti-loosening part, thus making it easy to install the anti-loosening device on the bolt.

[0104] Furthermore, regarding the above-described structure, appropriate changes, reorganizations, combinations, or omissions may be made without departing from the spirit of this invention.

[0105] This should be understood as meaning that a list in the form "at least one of A, B, and C" can contain items that can represent (A), (B), (C), (A and B), (A and C), (B and C), or (A, B, and C). Similarly, items listed in the form "at least one of A, B, or C" can represent (A), (B), (C), (A and B), (A and C), (B and C), or (A, B, and C).

Claims

1. An anti-loosening device, which can be installed on bolts used to secure bearings and brackets of a chain, for preventing the bolts from loosening, the chain being used to drive the steps of a passenger conveyor, the bracket being disposed in the frame of the steps, characterized in that, It has an anti-rotation part that is formed in the shape of a plate and has a through hole extending along the thickness direction. The bracket has a first surface that is fixed to the bearing by bolts and a second surface that is erected on the first surface. Multiple recesses are formed on the inner circumferential surface of the anti-rotation part so that it can be installed on the bolt at predetermined angles at intervals along the rotation direction of the bolt. A curved surface is formed on the outer peripheral surface of the anti-rotation part so that when the anti-loosening device is installed on the bolt in a manner facing the second surface, the bolt is allowed to rotate in the loosening direction within the specified angle range, and when the bolt rotates in the loosening direction by an angle greater than the specified angle, it abuts against the second surface, thereby preventing further rotation of the bolt.

2. The anti-loosening device according to claim 1, characterized in that, The bearing and the bracket are fixed by the bolt, and the anti-rotation part is formed such that, when the anti-loosening device is installed on the bolt, the upper surface of the bolt head and the upper surface of the anti-rotation part are located on the same plane.

3. The anti-loosening device according to claim 2, characterized in that, The bolt is a bolt with a spring washer. The anti-loosening device has a stepped portion connected to the anti-rotation portion, and has a height in the thickness direction of the anti-rotation portion that is the same as the height of the spring washer when the bolt is tightened with a specified torque.

4. The anti-loosening device according to claim 3, characterized in that, A flat portion is provided on the outer peripheral surface of the anti-rotation part, which is used to clamp and disassemble the anti-loosening device using a tool.

5. The anti-loosening device according to claim 3, characterized in that, It has an anti-fall-off part with a first locking part and a second locking part. The first locking part is the stepped part. When the anti-loosening device is installed on the bolt, the first locking part and the second locking part are positioned to clamp the bracket and the bearing from both sides in the thickness direction of the anti-rotation part.

6. The anti-loosening device according to claim 5, characterized in that, The anti-loosening device is made of synthetic resin.

7. The anti-loosening device according to claim 5, characterized in that, The anti-loosening part has an opening height, which is set such that when the anti-loosening device is installed on the bolt, the opening height is expanded by deforming the anti-loosening part within an elastic range, thereby allowing the bolt to be inserted into the through hole of the anti-rotation part, and the anti-loosening device returns to the opening height after release.

8. A passenger conveyor comprising steps, wherein a bearing for a chain driving the steps and a bracket disposed on a frame of the steps are fixed by bolts, characterized in that, The bracket has a first surface that is fixed to the bearing by bolts and a second surface that is erected on the first surface. The bolt is fitted with an anti-loosening device as described in any one of claims 1-7.

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