Burr polishing device

Abstract

The utility model provides a burr polishing device, which belongs to the technical field of chain polishing equipment and comprises an operation base station, a chain is arranged in the middle of the operation base station, a driving device is arranged at one end of the chain, a linkage device is arranged at the other end of the chain, and a sliding device is arranged on each of two sides of the chain. The two ends of the chain are fixed through positioning buckles, a linkage block is arranged on each sliding device in a sliding mode, a polishing roller is arranged on the side, close to the chain, of each linkage block in a rotating mode, and the bottoms of the two ends of each sliding device are each provided with a moving device. The driving motor and the rotating motor rotate synchronously at the same speed, then the chain is driven to rotate, the grinding roller rotates through the two symmetrical grinding motors, then the surface of the rotating chain is ground and polished, and then the distance between the grinding roller and the chain is adjusted through the moving device. Therefore, the chain can be prevented from being excessively abraded during polishing, and the service life of the chain is prevented from being shortened during polishing.

Description

Technical Field

[0001] This utility model relates to the technical field of chain polishing equipment, specifically to a burr polishing device. Background Technology

[0002] Crane chains are high-strength metal chains used in the industrial field for lifting and moving heavy objects. Their core function is to bear high loads and transmit tension.

[0003] In related technologies, during the production process of lifting chains (such as cutting, forging, welding, heat treatment, etc.), burrs are formed on the surface of the lifting chain. These burrs easily rub against other components such as wire ropes and hooks, generating metal debris that contaminates the lubrication system, creating abrasive wear cycles. This causes the chain diameter to decrease rapidly, reducing its load-bearing capacity. Burrs may also snag on external objects (such as hoisting loads or ropes), leading to sudden overload or even breakage of the chain. At the same time, burr areas are prone to becoming corrosion initiation points, especially in humid environments, accelerating rusting and further weakening the chain strength. Therefore, it is necessary to use chain burr polishing devices.

[0004] Current chain polishing devices typically place the chain inside a polishing barrel and use polishing balls on the inner wall of the barrel to polish the chain surface. However, this type of polishing device can only polish smaller chains, and polishing the chain with polishing balls causes the chain to be constantly impacted inside the polishing barrel, which can easily lead to excessive wear and reduce the chain's service life. To solve the above problems, a burr polishing device is proposed. Utility Model Content

[0005] In view of this, the present invention provides a burr polishing device. The present invention fixes one end of the chain to the drive device and the other end of the chain to the linkage device by means of a positioning buckle, so that the drive motor and the rotary motor rotate synchronously and at the same speed, thereby driving the chain to rotate. Then, by activating two symmetrical polishing motors, the polishing rollers are rotated, thereby polishing the surface of the rotating chain. The distance between the polishing rollers and the chain is adjusted by a moving device, thereby preventing the chain from being subjected to excessive wear during polishing, thus preventing the chain's lifespan from being reduced during polishing.

[0006] To solve the above-mentioned technical problems, this utility model provides a burr grinding device, including an operating base, a chain in the middle of the operating base, a driving device at one end of the chain, a linkage device at the other end of the chain, a sliding device on both sides of the chain, a linkage block slidably mounted on each sliding device, a grinding roller rotatably mounted on the side of each linkage block near the chain, and a moving device at the bottom of both ends of each sliding device, the moving device being slidably connected to the sliding device.

[0007] The drive unit includes a support frame connected to the operating base. The support frame is used to fix the drive motor, thereby connecting the operating base to the drive motor. The drive motor is installed on the upper part of the support frame. The drive motor is used to drive the connecting shaft to rotate. The output end of the drive motor is provided with a connecting shaft, which is used to connect the drive motor to the electric push rod. Thus, when the connecting shaft rotates, the electric push rod also rotates. The end of the connecting shaft near the chain is provided with an electric push rod, which is used to adjust the distance between the positioning buckle and the chain. The telescopic end of the electric push rod is provided with a positioning buckle, which is used to connect and fix the electric push rod to one end of the chain. The positioning buckle is locked to one end of the chain.

[0008] The linkage device includes a support plate connected to the operating base. The support plate is used to fix and install a rotary motor. The rotary motor is fixedly installed on the support plate and is used to rotate synchronously with the drive motor. A rotating shaft is rotatably installed on the rotary motor. The rotating shaft is used to connect another positioning buckle to the rotary motor, thereby fixing the other end of the chain. A positioning buckle is provided at one end of the rotating shaft near the chain. The positioning buckle is used to fix the other end of the chain and is locked to the other end of the chain.

[0009] Each grinding roller has a connecting plate at both the top and bottom. The upper connecting plate is used to fix the grinding motor, and the lower connecting plate is used to fix the bearing seat. Each connecting plate is fixed to the linkage block on the same side. The grinding motor is rotatably mounted on the upper connecting plate. The grinding motor is used to drive the grinding roller to rotate, thereby grinding and polishing the edge of the chain. The bearing seat is rotatably mounted on the lower connecting plate. The bearing seat is used to fix the rotating shaft of the grinding motor that passes through the grinding roller.

[0010] Each sliding device includes a slide rod arranged along the chain axis. The slide rod is used to move the linkage block back and forth. The linkage block is slidably mounted on the slide rod. A support column is fixedly mounted at both ends of the slide rod. The support column is used to fix the slide rod, thereby connecting the slide rod to the operating base. A hydraulic push rod is fixedly mounted on one of the support columns on the same side. The hydraulic push rod is used to push the fixed block to move. A fixed block is provided at the telescopic end of the hydraulic push rod. The fixed block is used to connect the telescopic end of the hydraulic push rod to the linkage block, so that the linkage block can move with the hydraulic push rod. The fixed block is connected to the linkage block.

[0011] Each moving device includes a slide rail located at the bottom of a support column. The slide rail is used for the movement of the slider. Each slide rail is embedded in the operating base. A slider is slidably installed in each slide rail. The slider is used to connect the support column to the slide rail, so that the support column moves synchronously when the slider moves. Each slider is connected to the bottom of the support column on the same side. One end of each slider is provided with an electric telescopic rod. The electric telescopic rod is used to drive the slider to move within the slide rail. The drive end of each electric telescopic rod is connected to the end of the slide rail. The drive end of the electric telescopic rod is away from the support column on the same side.

[0012] Each positioning buckle includes a base plate for fixing the limiting band and the slot. Each base plate has a limiting band at one end near the chain, which is used to adjust and limit the movement of chains of different sizes. The end of the limiting band away from the base plate has a buckle for fixing the limiting band to the slot. The positioning buckle is generally arc-shaped. Each base plate has a slot at the other end near the chain, which is used to receive the buckle and thus fix both ends of the chain. The slot and the buckle lock together.

[0013] In summary, compared with the prior art, this application includes at least one of the following beneficial technical effects:

[0014] 1. One end of the chain is fixed to the drive unit by a positioning buckle, and the other end is fixed to the linkage unit, so that the drive motor and the rotary motor rotate synchronously and at the same speed, thereby driving the chain to rotate. Then, by starting two symmetrical grinding motors, the grinding rollers rotate, thereby grinding and polishing the surface of the rotating chain. The distance between the grinding rollers and the chain is adjusted by a moving device, which can prevent the chain from being excessively worn during grinding, thus preventing the chain's lifespan from being reduced.

[0015] 2. The support plate is used to fix and install the rotary motor. The rotary motor is used to rotate synchronously and at the same speed as the drive motor. The rotating shaft is used to connect another positioning buckle to the rotary motor, thereby fixing the other end of the chain. The positioning buckle is used to fix the other end of the chain. Through the cooperation of the drive device and the linkage device, chains of different widths can be polished.

[0016] 3. The slide rail is used to move the slider, and the slider is used to connect the support column to the slide rail. When the slider moves, the support column also moves synchronously. The electric telescopic rod is used to drive the slider to move within the slide rail, thereby adjusting the distance between the grinding roller and the chain, so as to adapt to chains of different widths. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the main structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the main structure of this utility model;

[0019] Figure 3 This is a top view of the structure of this utility model;

[0020] Figure 4 This utility model Figure 3 A magnified view of part A;

[0021] Figure 5 This is a side sectional view of the present invention;

[0022] Figure 6 This is a side sectional view of the present invention.

[0023] Explanation of reference numerals in the attached drawings: 100, operating base; 101, chain; 200, drive device; 201, support frame; 202, drive motor; 203, connecting shaft; 204, electric push rod; 300, linkage device; 301, support plate; 302, rotary motor; 303, rotating shaft; 400, sliding device; 401, linkage block; 402, grinding roller; 403, connecting plate; 404, grinding motor; 405, bearing seat; 406, slide rod; 407, support column; 408, hydraulic push rod; 409, fixing block; 500, moving device; 501, slide rail; 502, slider; 503, electric telescopic rod; 600, positioning buckle; 601, base plate; 602, limit belt; 603, buckle; 604, slot. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the following will be described in conjunction with the accompanying drawings of the embodiments of this utility model. Figure 1-6 The technical solutions of the embodiments of this utility model are clearly and completely described below. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of this utility model are within the protection scope of this utility model.

[0025] like Figure 1-6As shown: This embodiment provides a burr grinding device, including an operating base 100. A chain 101 is provided in the middle of the operating base 100. The operating base 100 can be set vertically or horizontally. The chain 101 is located in the middle of the bearing surface of the operating base 100. A driving device 200 is provided at one end of the chain 101 to drive one end of the chain 101 to rotate. A linkage device 300 is provided at the other end of the chain 101 to drive the other end of the chain 101 to rotate synchronously and at the same speed. A sliding device 400 is provided on both sides of the chain 101 to allow the grinding roller 402 to move along the axial direction of the chain 101. Each sliding device... Each sliding device 400 has a sliding linkage block 401. The linkage block 401 is used to connect the polishing roller 402 to the sliding device 400. Each linkage block 401 has a polishing roller 402 rotatably mounted on the side of the chain 101. The two polishing rollers 402 are symmetrically matched to polish the rotating chain 101. Each sliding device 400 has a moving device 500 at both ends of its bottom. The moving device 500 is used to adjust the distance between the support column 407 and the chain 101, and thus adjust the distance between the polishing roller 402 and the chain 101. This allows for polishing of chains 101 with different widths. The moving device 500 is slidably connected to the sliding device 400.

[0026] In use, one end of the chain 101 is fixed to the drive device 200 by the positioning buckle 600, and the other end of the chain 101 is fixed to the linkage device 300, so that the drive motor 202 and the rotary motor 302 rotate synchronously and at the same speed, thereby driving the chain 101 to rotate. Then, by starting the two symmetrical grinding motors 404, the grinding roller 402 is rotated, thereby grinding and polishing the surface of the rotating chain 101. The distance between the grinding roller 402 and the chain 101 is adjusted by the moving device 500, thereby preventing the chain 101 from being excessively worn during grinding, thus preventing the chain 101 from being shortened in life during grinding.

[0027] This embodiment provides a burr removal device.

[0028] like Figure 1 , 2As shown in Figure 3: The drive device 200 includes a support frame 201 connected to the operating base 100. The support frame 201 and the operating base 100 can be fixed by bolts or welded. The support frame 201 is used to fix the drive motor 202, thereby connecting the operating base 100 and the drive motor 202. The drive motor 202 is provided on the upper part of the support frame 201. The drive motor 202 is fixed to the support frame 201 by bolts. The drive motor 202 is used to drive the connecting shaft 203 to rotate. The output end of the drive motor 202 is provided with the connecting shaft 203. The connecting shaft 203 and the drive motor 202 are mechanically sealed through a connector. The bottom of the coupling is provided with a bracket. The connecting shaft 203 is used to drive the drive motor 202 to rotate. 02 is connected to the electric push rod 204, so that when the connecting shaft 203 rotates, the electric push rod 204 also rotates. The electric push rod 204 is provided at one end of the connecting shaft 203 near the chain 101. The drive end of the electric push rod 204 is provided with a housing. The housing at the drive end of the electric push rod 204 is fixed to the connecting shaft 203 by bolts. The electric push rod 204 is used to adjust the distance between the positioning buckle 600 and the chain 101. The telescopic end of the electric push rod 204 is provided with the positioning buckle 600. The electric push rod 204 is fixed to the base plate 601 on the positioning buckle 600 by bolts. The positioning buckle 600 is used to connect and fix the electric push rod 204 to one end of the chain 101. The positioning buckle 600 is locked to one end of the chain 101.

[0029] Its effect is as follows: the support frame 201 is used to fix the drive motor 202, thereby connecting the operating base 100 with the drive motor 202. The drive motor 202 is used to drive the connecting shaft 203 to rotate. The connecting shaft 203 is used to connect the drive motor 202 with the electric push rod 204. Thus, when the connecting shaft 203 rotates, the electric push rod 204 also rotates. The electric push rod 204 is used to adjust the distance between the positioning buckle 600 and the chain 101. The positioning buckle 600 is used to connect and fix the electric push rod 204 to one end of the chain 101.

[0030] like Figure 1 , 2As shown in Figure 3: The linkage device 300 includes a support plate 301 connected to the operating base 100. The support plate 301 is welded to the operating base 100. The support plate 301 is used to fix and install a rotary motor 302. The rotary motor 302 is fixedly installed on the support plate 301. The rotary motor 302 and the support plate 301 are fixedly connected and fixed by a motor bracket and bolts. The rotary motor 302 is used to cooperate with the drive motor 202 to rotate synchronously. A rotating shaft 303 is rotatably installed on the rotary motor 302. The shaft 303 and the rotary motor 302 are mechanically sealed together by a coupling. The rotating shaft 303 is used to connect another positioning buckle 600 to the rotary motor 302, thereby fixing the other end of the chain 101. The rotating shaft 303 is provided with a positioning buckle 600 near the end of the chain 101. The bottom of the rotating shaft 303 and the positioning buckle 600 are fixed together by bolts. The positioning buckle 600 is used to fix the other end of the chain 101 and is locked to the other end of the chain 101.

[0031] Its effect is as follows: the support plate 301 is used to fix the rotary motor 302, the rotary motor 302 is used to cooperate with the drive motor 202 to rotate synchronously and at the same speed, the rotating shaft 303 is used to connect another positioning buckle 600 to the rotary motor 302, thereby fixing the other end of the chain 101. The positioning buckle 600 is used to fix the other end of the chain 101. Through the cooperation of the drive device 200 and the linkage device 300, chains 101 of different widths can be polished.

[0032] like Figure 1 , 2 As shown in Figures 3 and 5: Each grinding roller 402 has a connecting plate 403 at both its upper and lower ends. The connecting plate 403 is welded to the linkage block 401 or fixed by bolts. The upper connecting plate 403 has an opening in the center and is used to fix the grinding motor 404. The lower connecting plate 403 is used to fix the bearing seat 405. Each connecting plate 403 is fixed to the linkage block 401 on the same side. The grinding motor is rotatably mounted on the upper connecting plate 403. 404. A rotating shaft is provided on the grinding motor 404, which passes through the grinding roller 402 and is mechanically sealed to the bearing seat 405. The grinding motor 404 is used to drive the grinding roller 402 to rotate, thereby grinding and polishing the edge of the chain 101. The bearing seat 405 is rotatably provided on the connecting plate 403 located at the lower part. The bearing seat 405 is fixed to the connecting plate 403 located at the lower part by bolts. The bearing seat 405 is used to fix the rotating shaft of the grinding motor 404 passing through the grinding roller 402.

[0033] The effect is as follows: the upper connecting plate 403 is used to fix the grinding motor 404, the lower connecting plate 403 is used to fix the bearing seat 405, the grinding motor 404 is used to drive the grinding roller 402 to rotate, thereby grinding and polishing the edge of the chain 101, and the bearing seat 405 is used to fix the rotating shaft of the grinding motor 404 passing through the grinding roller 402.

[0034] like Figure 1 , 2 As shown in Figure 3: Each sliding device 400 includes a slide rod 406 arranged axially along the chain 101. Both ends of the slide rod 406 are embedded in their corresponding support columns 407. The slide rod 406 is used to move the linkage block 401 back and forth. The linkage block 401 is slidably mounted on the slide rod 406. A support column 407 is fixedly mounted at both ends of the slide rod 406. The support columns 407 can be made of stainless steel and are used to fix the slide rod 406, thereby connecting the slide rod 406 to the operating base 100. A support column 407 is fixedly mounted on one of the support columns 407 on the same side. A hydraulic push rod 408 is fixedly provided. The driving end of the hydraulic push rod 408 is fixedly connected to one of the support columns 407 by bolts. The hydraulic push rod 408 is used to push the fixed block 409 to move. The telescopic end of the hydraulic push rod 408 is provided with a fixed block 409. The fixed block 409 is fixedly connected to the telescopic end of the hydraulic push rod 408 by bolts. The fixed block 409 is used to connect the telescopic end of the hydraulic push rod 408 to the linkage block 401, so that the linkage block 401 can move with the hydraulic push rod 408. The fixed block 409 is connected to the linkage block 401.

[0035] Its effects are as follows: the slide rod 406 is used to move the linkage block 401 back and forth, the support column 407 is used to fix the slide rod 406, thereby connecting the slide rod 406 to the operating base 100, the hydraulic push rod 408 is used to push the fixed block 409 to move, and the fixed block 409 is used to connect the telescopic end of the hydraulic push rod 408 to the linkage block 401, thereby allowing the linkage block 401 to move with the hydraulic push rod 408.

[0036] like Figure 1 , 2As shown in Figures 3 and 6: Each moving device 500 includes a slide rail 501 disposed at the bottom of the support column 407. The slide rail 501 is used for the movement of the slider 502. Each slide rail 501 is embedded in the operating base 100. A slider 502 is slidably disposed in each slide rail 501. The slider 502 and the support column 407 can be fixed by welding or by bolting with shims. The slider 502 is used to connect the support column 407 and the slide rail 501, so that when the slider 502 moves, the support... The column 407 also moves synchronously. Each slider 502 is connected to the bottom of the support column 407 on the same side. One end of each slider 502 is provided with an electric telescopic rod 503. The telescopic end of the electric telescopic rod 503 is fixed to the slider 502 by bolts. The electric telescopic rod 503 is used to drive the slider 502 to move within the slide rail 501. The driving end of each electric telescopic rod 503 is connected to the end of the slide rail 501 by bolts. The driving end of the electric telescopic rod 503 is away from the support column 407 on the same side.

[0037] Its effect is as follows: the slide rail 501 is used for the slider 502 to move, the slider 502 is used to connect the support column 407 to the slide rail 501, so that when the slider 502 moves, the support column 407 also moves synchronously. The electric telescopic rod 503 is used to drive the slider 502 to move within the slide rail 501, thereby adjusting the distance between the grinding roller 402 and the chain 101, so as to adapt to chains 101 of different widths.

[0038] like Figure 3 , 4 As shown: Each positioning buckle 600 includes a base plate 601. The base plate 601 of one positioning buckle 600 is bolted to the telescopic end of the electric push rod 204. The base plate 601 of the other positioning buckle 600 is bolted to the rotating shaft 303. The base plate 601 is used to fix the limiting band 602 and the slot 604. Each base plate 601 has a limiting band 602 at one end near the chain 101. The end of the limiting band 602 is provided with a connecting buckle that is hinged to the base plate 601. The limiting band 602 is used to adjust and limit the chain 101 of different sizes. The end of the limiting band 602 away from the base plate 601 is provided with a buckle. 603, buckle 603 and limit band 602 are fixed together by bolts. Buckle 603 is used to fix limit band 602 on slot 604. Positioning buckle 600 is arc-shaped. Each base plate 601 has a slot 604 at the other end of the side near chain 101. Slot 604 is fixed together with base plate 601 by bolts. Slot 604 is used to receive buckle 603, thereby fixing both ends of chain 101. Slot 604 and buckle 603 are locked together.

[0039] Its effect is as follows: the base plate 601 is used to fix the limiting band 602 and the slot 604. The limiting band 602 is used to adjust and limit the chain 101 of different sizes. The buckle 603 is used to fix the limiting band 602 on the slot 604. The positioning buckle 600 is arc-shaped. The slot 604 is used to receive the buckle 603, thereby fixing both ends of the chain 101.

[0040] Working principle: One end of the chain 101 is fixed to the drive device 200 by the positioning buckle 600, and the other end of the chain 101 is fixed to the linkage device 300. This causes the drive motor 202 in the drive device 200 and the rotary motor 302 in the linkage device 300 to rotate synchronously and at the same speed, thereby driving the chain 101 to rotate. The distance between the drive device 200 and the linkage device 300 can be adjusted by the electric push rod 204 on the drive device 200, so as to accommodate chains 101 of different lengths. Then, by activating the two symmetrical grinding motors 404, the grinding roller 402 is rotated, thereby grinding and polishing the surface of the rotating chain 101. The distance between the grinding roller 402 and the chain 101 can be adjusted by the moving device 500, which can accommodate chains 101 of different widths and prevent the chain 101 from being excessively worn during grinding, thus preventing the chain 101 from being shortened in life.

[0041] Furthermore, it should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0042] The above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A burr-removing device, comprising an operating base (100), characterized in that: The operating base (100) is provided with a chain (101) in the middle. One end of the chain (101) is provided with a driving device (200), and the other end of the chain (101) is provided with a linkage device (300). A sliding device (400) is provided on both sides of the chain (101). A linkage block (401) is slidably provided on each sliding device (400). A grinding roller (402) is rotatably provided on the side of each linkage block (401) near the chain (101). A moving device (500) is provided at the bottom of both ends of each sliding device (400). The moving device (500) is slidably connected to the sliding device (400).

2. The deburring device as described in claim 1, characterized in that: The drive device (200) includes a support frame (201) connected to the operating base (100). A drive motor (202) is provided on the upper part of the support frame (201). A connecting shaft (203) is provided at the output end of the drive motor (202). An electric push rod (204) is provided at one end of the connecting shaft (203) near the chain (101). A positioning buckle (600) is provided at the telescopic end of the electric push rod (204). The positioning buckle (600) is locked to one end of the chain (101).

3. The deburring device as described in claim 2, characterized in that: The linkage device (300) includes a support plate (301) connected to the operating base (100). A rotary motor (302) is fixedly installed on the support plate (301). A rotating shaft (303) is rotatably installed on the rotary motor (302). A positioning buckle (600) is provided at one end of the rotating shaft (303) near the chain (101). The positioning buckle (600) is locked to the other end of the chain (101).

4. The deburring device as described in claim 3, characterized in that: Each of the grinding rollers (402) has a connecting plate (403) at both the upper and lower ends. Each connecting plate (403) is fixed to the linkage block (401) on the same side. A grinding motor (404) is rotatably mounted on the upper connecting plate (403), and a bearing seat (405) is rotatably mounted on the lower connecting plate (403).

5. The deburring device as described in claim 4, characterized in that: Each of the sliding devices (400) includes a slide rod (406) arranged axially along the chain (101), the linkage block (401) is slidably arranged on the slide rod (406), and a support column (407) is fixedly arranged at both ends of the slide rod (406). A hydraulic push rod (408) is fixedly arranged on one of the support columns (407) on the same side. A fixing block (409) is provided at the telescopic end of the hydraulic push rod (408), and the fixing block (409) is connected to the linkage block (401).

6. The deburring device as described in claim 5, characterized in that: Each of the moving devices (500) includes a slide rail (501) disposed at the bottom of the support column (407). Each slide rail (501) is embedded in the operating base (100). Each slide rail (501) has a slider (502) slidably disposed therein. Each slider (502) is connected to the bottom of the support column (407) on the same side. One end of each slider (502) is provided with an electric telescopic rod (503). The driving end of each electric telescopic rod (503) is connected to the end of the slide rail (501). The driving end of the electric telescopic rod (503) is away from the support column (407) on the same side.

7. The deburring device as described in claim 6, characterized in that: Each of the positioning buckles (600) includes a base plate (601). Each base plate (601) has a limiting band (602) at one end near the chain (101), and a buckle (603) at the end of the limiting band (602) away from the base plate (601). Each base plate (601) has a slot (604) at the other end near the chain (101), and the slot (604) engages with the buckle (603).

Images