Lifting tool for linear guide rail machining

Abstract

The embodiment of the utility model provides a lifting tool for linear guide rail machining, and relates to the technical field of linear guide rail machining, the lifting tool comprises a base plate, a longitudinal positioning mechanism is fixedly mounted in the middle of the top of the base plate, and a transverse positioning mechanism is fixedly mounted at the bottom of the base plate. By arranging the longitudinal positioning mechanism and the transverse positioning mechanism, all-directional clamping and positioning of the linear guide rail can be achieved, after the driving motor is started, the side rods and the limiting plates are pushed to clamp the two sides and the two ends of the guide rail through rotation of the lead screw and reciprocating sliding of the sliding block, and meanwhile, the clamping efficiency is improved. The first lead screw and the second lead screw can synchronously rotate through transmission connection of the worm and the worm wheel, so that the bearing frame is driven to reciprocate, the two ends of the guide rail are clamped, the device can adapt to guide rails of different lengths and numbers through the design of the bearing frame and the limiting spring, the lifting efficiency is improved, and the overall lifting efficiency is improved. The lifting device can stably and efficiently lift the linear guide rail and meet the machining requirement.

Description

Technical Field

[0001] The present application relates to the technical field of linear guide rail processing, and in particular to a lifting tool for linear guide rail processing. Background Art

[0002] The handling tooling used in the production and processing of linear guides is an important part of ensuring production efficiency and product quality. The handling tooling is mainly used to safely and accurately move and position the linear guides during the processing process for subsequent processing, testing or assembly operations.

[0003] Currently, the existing handling tooling usually adopts a steel cable fixing method to assist in lifting the linear guide rails. However, the linear guide rails are generally in the shape of narrow long strips. The existing handling devices have certain problems. For example, on the one hand, the above-mentioned device can only transport a single set of linear guide rails during each handling process, and the overall equipment lifting efficiency is low. In addition, the overall lifting stability during the lifting process is poor. The existing lifting equipment lacks a stable lifting limit structure, and the surface of the linear guide rails is relatively smooth. It can be seen that its lifting processing stability is poor and needs to be improved. Utility Model Content

[0004] The embodiment of the present application provides a lifting tool for linear guide rail processing, which is used to solve the problem of poor transportation stability of the current lifting tool for linear guide rail processing.

[0005] The embodiment of the present application provides a lifting tool for linear guide rail processing, comprising: a base plate, a longitudinal positioning mechanism is fixedly installed in the middle of the top of the base plate, a transverse positioning mechanism is fixedly installed at the bottom of the base plate, the longitudinal positioning mechanism and the transverse positioning mechanism are vertically arranged, a transmission assembly is provided between the longitudinal positioning mechanism and the transverse positioning mechanism, the longitudinal positioning mechanism and the transverse positioning mechanism are connected by transmission through the transmission assembly, a hanging frame is fixedly installed on the top of the base plate, a hinge ball is rotatably connected to the middle of the upper end of the hanging frame, and a hanging steel cable is fixedly installed on the top of the hinge ball;

[0006] The longitudinal positioning mechanism includes a longitudinal rail, which is fixedly installed in the middle of the top of the base plate. A driving motor is fixedly installed at one end of the longitudinal rail. The output end of the driving motor passes through the longitudinal rail and a first screw rod is fixedly installed. The first screw rod is rotatably connected to the inside of the longitudinal rail. The threads at both ends of the first screw rod have opposite rotation directions, and both ends of the first screw rod are threadedly connected to positioning components.

[0007] In a feasible implementation, the transverse positioning mechanism includes a transverse rail, which is fixedly installed in the middle of the bottom of the base plate. The interior of the transverse rail is rotatably connected to a second screw rod, and the threads at both ends of the second screw rod have opposite rotation directions. Both ends of the second screw rod are threadedly connected to a sliding rod, and the sliding rod is slidably connected to the interior of the transverse rail, and a receiving frame is fixedly installed on the outside of the sliding rod.

[0008] In a feasible implementation, the side surface of the receiving frame is L-shaped, and the receiving frame is configured as a stainless steel frame.

[0009] In a feasible implementation, the transmission assembly includes a worm and a worm wheel, the worm is fixedly installed at the middle of the first screw, the worm wheel is fixedly installed at the middle of the second screw, and the worm and the worm wheel are drivingly connected.

[0010] In a feasible implementation, the positioning assembly includes a sliding block, which is threadedly connected to the two ends of the first screw rod, and the sliding block is slidably connected to the two ends of the longitudinal rail. A support rod is fixedly installed at the bottom of the sliding block, and a side plate is fixedly installed at the bottom of the support rod. Limiting springs are fixedly installed at equal intervals on the inner side of the side plate, and the ends of the limiting springs are fixedly installed with limiting plates.

[0011] In a feasible implementation, support rods are fixedly installed at equal intervals on the outer side of the limiting plate, and the outer ends of the support rods pass through the side plate.

[0012] In a feasible implementation, the outer edges and corners of the receiving frame, the base plate and the hanging frame are all arranged in arc shape, and the overall cross-sectional shape of the hanging frame is arranged in an isosceles trapezoid.

[0013] The embodiment of the present application provides a lifting tool for linear guide rail processing. By setting up longitudinal and transverse positioning mechanisms, the device can achieve all-round clamping and positioning of the linear guide rail. After the drive motor is started, the side rods and limit plates are pushed to clamp the two sides and ends of the guide rail through the rotation of the lead screw and the reciprocating sliding of the sliding block. At the same time, the transmission connection between the worm and the worm wheel enables the first lead screw and the second lead screw to rotate synchronously, thereby driving the receiving frame to reciprocate and achieve clamping of the two ends of the guide rail. The design of the receiving frame and the limit spring enables the device to adapt to guide rails of different lengths and numbers, thereby improving the lifting efficiency. On the whole, the device can stably and efficiently lift the linear guide rail to meet the processing requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The drawings described herein are used to provide further understanding of the present invention and constitute a part of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present application and do not constitute improper limitations on the present invention.

[0015] In the attached picture:

[0016] Figure 1 It is a structural schematic diagram provided by an embodiment of the present application;

[0017] Figure 2 It is a bottom-up structural schematic diagram provided by an embodiment of the present application;

[0018] Figure 3 This is a schematic diagram of the structure of the connection state of the transmission assembly, the first screw rod and the second screw rod provided in one embodiment of the present application;

[0019] Figure 4 It is a schematic diagram of the structure of a positioning component provided in one embodiment of the present application.

[0020] Description of reference numerals:

[0021] 100-base plate; 200-longitudinal positioning mechanism; 300-lateral positioning mechanism; 400-hanging frame; 500-transmission assembly; 600-articulated ball; 700-hanging cable;

[0022] 210-longitudinal rail; 220-driving motor; 230-first screw rod; 240-positioning assembly;

[0023] 241-sliding block; 242-support rod; 243-side plate; 244-limiting spring; 245-limiting plate; 246-support rod;

[0024] 310- transverse rail; 320- second screw rod; 330- sliding rod; 340- receiving frame;

[0025] 510-worm; 520-worm wheel. DETAILED DESCRIPTION

[0026] In order to enable those skilled in the art to better understand the technical solutions in this application, the following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of this application.

[0027] Example

[0028] refer to Figures 1 to 4The present embodiment is a lifting tool for machining a linear guide rail, comprising: a base plate 100, a longitudinal positioning mechanism 200 is fixedly installed in the middle of the top of the base plate 100, a transverse positioning mechanism 300 is fixedly installed at the bottom of the base plate 100, the longitudinal positioning mechanism 200 and the transverse positioning mechanism 300 are vertically arranged, a transmission assembly 500 is provided between the longitudinal positioning mechanism 200 and the transverse positioning mechanism 300, the longitudinal positioning mechanism 200 and the transverse positioning mechanism 300 are connected by the transmission assembly 500, a hanging frame 400 is fixedly installed on the top of the base plate 100, a hinge ball 600 is rotatably connected to the middle of the upper end of the hanging frame 400, and a hanging steel cable 700 is fixedly installed on the top of the hinge ball 600;

[0029] The longitudinal positioning mechanism 200 includes a longitudinal rail 210, which is fixedly installed in the middle of the top of the substrate 100. A drive motor 220 is fixedly installed at one end of the longitudinal rail 210. The output end of the drive motor 220 runs through the longitudinal rail 210 and is fixedly installed with a first screw rod 230. The first screw rod 230 is rotatably connected to the inside of the longitudinal rail 210. The two ends of the first screw rod 230 have opposite screw directions. Both ends of the first screw rod 230 are threadedly connected with a positioning assembly 240. The longitudinal positioning mechanism 200 and the lateral positioning mechanism 300 are vertically arranged to ensure the stability and accuracy of the tooling when positioning the linear guide. The longitudinal positioning mechanism 200 is mainly composed of the longitudinal rail 210, the drive motor 220 and the first screw rod 230. The longitudinal rail 210 is fixedly installed in the middle of the top of the substrate 100 as the basis of the entire positioning mechanism. The drive motor 220 is installed at one end of the longitudinal rail 210, and its output end runs through the longitudinal rail 210 and is fixedly connected to the first screw rod 230. The first screw rod 230 rotates inside the longitudinal rail 210, and the threads at both ends thereof rotate in opposite directions. This design enables the positioning components 240 at both ends thereof to move toward or away from each other when the driving motor 220 drives the first screw rod 230 to rotate, thereby realizing precise positioning of the linear guide in the longitudinal direction. At the same time, the design of the transverse positioning mechanism 300 also fully considers the positioning requirements of the linear guide. By realizing linkage with the transmission component 500 between the longitudinal positioning mechanism 200, when the longitudinal positioning mechanism 200 is positioned, the transverse positioning mechanism 300 can also be positioned synchronously, thereby ensuring that the linear guide can be stably and accurately positioned in both the horizontal and vertical directions. In addition, the design of the hanging frame 400 and the articulated ball 600 enables the tooling to be conveniently hoisted and moved through the hoisting cable 700. The design of the articulated ball 600 also provides flexibility, allowing the tooling to adjust the angle within a certain range to adapt to different working environments and hoisting requirements. This kind of lifting tooling for linear guide rail processing provides great convenience for the processing and lifting of linear guide rails through its sophisticated design and efficient positioning mechanism, thereby improving production efficiency and quality.

[0030] The transverse positioning mechanism 300 includes a transverse rail 310, which is fixedly installed in the middle of the bottom of the substrate 100. The interior of the transverse rail 310 is rotatably connected with a second screw rod 320, and the two ends of the second screw rod 320 have opposite screw directions. Both ends of the second screw rod 320 are threadedly connected with a slide rod 330, and the slide rod 330 is slidably connected to the interior of the transverse rail 310. The outer side of the slide rod 330 is fixedly installed with a receiving frame 340; the transverse rail 310 is fixedly installed in the middle of the bottom of the substrate 100, providing a stable support for the transverse positioning mechanism 300. Inside the transverse rail 310, the second screw rod 320 is rotatably connected, and the two ends of the second screw rod 320 have opposite screw directions. This design enables the slide rods 330 at both ends to move synchronously and toward or away from each other when the screw rod rotates, thereby realizing the transverse positioning of linear guides of different lengths. The slide rod 330 is slidably connected to the interior of the transverse rail 310, ensuring the stability and accuracy of the slide rod 330 during movement. A receiving frame 340 is fixedly installed on the outer side of the slide bar 330, which is used to receive and fix the linear guide rail. The design of the receiving frame 340 takes stability and ease of use into consideration, and can firmly support the linear guide rail to prevent shaking or falling off during lifting. Through the cooperation of the lateral positioning mechanism 300 and the longitudinal positioning mechanism 200, the tooling can achieve precise positioning of the linear guide rail in the horizontal and vertical directions. This design not only improves the accuracy and stability of positioning, but also simplifies the operation process and improves work efficiency. The lateral positioning mechanism 300 in the lifting tooling for linear guide rail processing is reasonably designed and practical, and can meet the processing requirements of linear guide rails of different sizes and specifications, providing strong support for the precise positioning and stable lifting of the linear guide rail.

[0031] The side shape of the receiving frame 340 is L-shaped, and the receiving frame 340 is configured as a stainless steel frame; the L-shaped side shape of the receiving frame 340 not only provides a larger support area, making the linear guide more stable during the positioning process, but also its unique structure enables the frame to fit closely to the linear guide, further enhancing the accuracy of positioning. In addition, the L-shaped design also makes it easier for operators to observe and adjust the position of the linear guide, thereby improving work efficiency. The choice of stainless steel material gives the receiving frame 340 excellent durability. Stainless steel has the characteristics of corrosion resistance and wear resistance, and can maintain long-term stability even in harsh working environments. This means that the receiving frame 340 can withstand the weight of the linear guide and the vibration during lifting for a long time, and is not prone to deformation or damage, thereby ensuring the long-term use of the tooling.

[0032] The transmission assembly 500 includes a worm 510 and a worm wheel 520. The worm 510 is fixedly mounted in the middle of the first screw 230, and the worm wheel 520 is fixedly mounted in the middle of the second screw 320. The worm 510 and the worm wheel 520 are connected in transmission; the worm 510 is fixedly mounted in the middle of the first screw 230, and the worm wheel 520 is fixedly mounted in the middle of the second screw 320. Such a layout makes the entire transmission system compact and reasonable. The transmission connection between the worm 510 and the worm wheel 520 is the key to achieving precise positioning of the tooling. When the worm 510 rotates, the worm wheel 520 can rotate synchronously through its unique spiral shape and interaction with the gear ring of the worm wheel 520. This transmission method not only has a high transmission efficiency, but also can transmit a large torque, thereby ensuring the stability of the linear guide and the accuracy of positioning during the lifting process. In addition, the worm 510 and the worm wheel 520 can also be matched by conical gear matching, ball worm 510 matching or viscous matching, etc. These methods can further improve the efficiency and stability of the transmission and meet different working environments and processing requirements. The worm 510 and the worm wheel 520 in the transmission assembly 500 are exquisitely designed and practical, providing a stable and efficient transmission mechanism for the lifting tooling of the linear guide rail processing, ensuring the precise positioning and stable lifting of the linear guide rail.

[0033] The positioning assembly 240 includes a sliding block 241, which is threadedly connected to both ends of the first screw rod 230, and the sliding block 241 is slidably connected to both ends of the longitudinal rail 210. A support rod 242 is fixedly installed at the bottom of the sliding block 241, and a side plate 243 is fixedly installed at the bottom of the support rod 242. A limit spring 244 is fixedly installed at an equal interval on the inner side of the side plate 243, and a limit plate 245 is fixedly installed at the end of the limit spring 244. The positioning assembly 240 mainly consists of a sliding block 241, a support rod 242, a side plate 243 and a limit spring The first screw rod 230 is composed of a spring 244 and other components. The sliding block 241 is one of the core components. It is tightly fixed to the two ends of the first screw rod 230 through a threaded connection. When the first screw rod 230 rotates, the sliding block 241 can slide along the inner ends of the longitudinal rail 210, thereby realizing the longitudinal positioning of the linear guide rail. This design ensures the accuracy and reliability of positioning and effectively avoids positioning errors. The support rod 242 is connected to the bottom of the sliding block 241 to play a supporting and connecting role. The bottom of the support rod 242 is fixedly installed with a side plate 243. The side plate Limiting springs 244 are fixedly installed at equal intervals on the inner side of 243. The design of limiting springs 244 is very clever. They can deform when subjected to pressure to adapt to linear guides of different sizes. When the linear guide is placed between the side plates 243, the elastic force of limiting springs 244 will push limiting plates 245 to fit closely to the side of the linear guide to clamp and fix it. Limiting plate 245 is the last key component of positioning assembly 240. It is fixedly installed at the end of limiting springs 244. The design of limiting plate 245 is not Not only does it take into account the close fit with the linear guide rail, it also pays attention to the selection of materials and the accuracy of processing to ensure that it can withstand the vibration and impact during the lifting process. The design of the positioning component 240 takes into account both the accuracy and stability of positioning, and the flexibility and versatility. Through the coordinated action of components such as the sliding block 241, the support rod 242, the side plate 243 and the limit spring 244, it can achieve precise positioning and stable clamping of linear guide rails of different sizes and specifications, providing reliable guarantee for the processing and lifting of the linear guide rails.

[0034] Support rods 246 are fixedly installed at equal intervals on the outside of the limit plate 245, and the outer ends of the support rods 246 pass through the side plate 243; the equal spacing of the support rods 246 also ensures that the limit plate 245 has a uniform clamping force on the linear guide rail, avoiding positioning errors or damage caused by uneven clamping. In addition, the design of the support rods 246 passing through the side plate 243 is also convenient for installation and disassembly, so that the positioning assembly 240 can be easily adjusted and replaced when necessary. This flexibility enables the tooling to adapt to the processing requirements of linear guide rails of different sizes and specifications, and improves the versatility and practicality of the tooling. The design of the support rods 246 fixedly installed at equal intervals on the outside of the limit plate 245 and the support rods 246 passing through the side plate 243 further improves the stability and functionality of the linear guide rail processing and lifting tooling, ensuring the precise positioning and stable clamping of the linear guide rail during processing and lifting.

[0035] The outer edges and corners of the supporting frame 340, the base plate 100 and the hanging frame 400 are all set to arc shapes, and the overall cross-sectional shape of the hanging frame 400 is set to an isosceles trapezoid; the outer edges and corners of the supporting frame 340, the base plate 100 and the hanging frame 400 are all set to arc shapes. This design not only improves the aesthetics of the tooling, but more importantly, enhances its safety and practicality. The arc design can effectively reduce the sharpness of the edges and corners, reduce the risk of collision and scratches that may occur during operation and transportation, thereby protecting the safety of workers and equipment. At the same time, the overall cross-sectional shape of the hanging frame 400 is set to an isosceles trapezoid. This design takes into account The stability and load-bearing capacity during the lifting process are improved. The isosceles trapezoidal structure enables the lifting frame 400 to evenly distribute the load when subjected to force, reduce stress concentration, and thus improve the strength and durability of the entire tooling. In addition, the isosceles trapezoidal design also makes the lifting frame 400 more stable visually. By setting the outer edges and corners of these key components to arcs, and setting the overall cross-sectional shape of the lifting frame 400 to an isosceles trapezoid, the lifting tooling processed by the linear guide rail not only improves the safety and convenience of operation, but also enhances the stability and load-bearing capacity of its overall structure, providing a strong guarantee for the efficient and precise lifting of the linear guide rail.

[0036] The use principle and advantages are as follows: by arranging the longitudinal positioning mechanism 200 and the transverse positioning mechanism 300 to cooperate with each other, the device can be used to start the driving motor 220 to run, and the first screw rod 230 can be driven to rotate by starting the motor, and the first screw rod 230 can be assisted to drive the sliding block 241 to slide inside the longitudinal rail 210 by rotating, and the threads at both ends of the first screw rod 230 are rotated in opposite directions. At this time, the sliding block 241 can be driven to assist in driving the two groups of sliding blocks 241 to slide back and forth inside the longitudinal rail 210, and the reciprocating sliding of the sliding block 241 can drive the side rods to move relative to each other, and the mutual displacement of the side rods can push the limit rods to contact the two sides of the linear guide rail, during which the first screw rod 230 rotates to drive the worm 510 to rotate, and the worm 510 and the worm wheel 520 are connected in transmission, and then the worm 510 can be assisted to drive the worm wheel 520 to rotate, and the rotation of the worm wheel 520 can drive the second The screw rod 320 rotates, during which time the first screw rod 230 and the second screw rod 320 can be driven to rotate synchronously. At this time, the second screw rod 320 assists in driving the sliding rod 330 to drive the receiving frame 340 to reciprocate and move. The reciprocating movement of the receiving frame 340 can assist in clamping the two ends of the guide rail, and the side rod drives the limit plate 245 to reciprocate, so that the side of the linear guide rail can be clamped and positioned through the limit plate 245, so that the device can clamp and position both ends of the guide rail at the same time, which can improve the overall stability of the linear guide rail hoisting device, and during the guide rail hoisting process, the setting of the receiving frame 340 can synchronously accommodate multiple sets of guide rails, and the ductility of the limit spring 244 can be adaptively compressed when clamping and positioning multiple sets of guide rails. It can be seen that the device can not only clamp and hoist guide rails of different lengths, but also clamp and hoist guide rails of different quantities, which can maximize the lifting efficiency of the linear guide rail.

[0037] It is easy to understand that those skilled in the art can combine, split, reorganize, etc. the embodiments of the present application to obtain other embodiments based on the several embodiments provided in the present application, and these embodiments do not exceed the protection scope of the present application.

[0038] The above specific implementation methods further explain in detail the purpose, technical solutions and beneficial effects of the embodiments of the present application. It should be understood that the above are only specific implementation methods of the embodiments of the present application and are not used to limit the protection scope of the embodiments of the present application. Any modifications, equivalent substitutions, improvements, etc. made on the basis of the technical solutions of the embodiments of the present application should be included in the protection scope of the embodiments of the present application.

Claims

1. A lifting tool for linear guide rail processing, characterized in that: include: A base plate (100), wherein a longitudinal positioning mechanism (200) is fixedly installed in the middle of the top of the base plate (100), and a transverse positioning mechanism (300) is fixedly installed at the bottom of the base plate (100), wherein the longitudinal positioning mechanism (200) and the transverse positioning mechanism (300) are arranged vertically, and a transmission assembly (500) is arranged between the longitudinal positioning mechanism (200) and the transverse positioning mechanism (300), and the longitudinal positioning mechanism (200) and the transverse positioning mechanism (300) are transmission-connected via the transmission assembly (500), and a hanging frame (400) is fixedly installed on the top of the base plate (100), and a hinge ball (600) is rotatably connected to the middle of the upper end of the hanging frame (400), and a hanging steel cable (700) is fixedly installed on the top of the hinge ball (600); The longitudinal positioning mechanism (200) comprises a longitudinal rail (210), the longitudinal rail (210) being fixedly mounted in the middle of the top of the base plate (100), a driving motor (220) being fixedly mounted on one end of the longitudinal rail (210), an output end of the driving motor (220) penetrating the longitudinal rail (210) and being fixedly mounted with a first screw rod (230), the first screw rod (230) being rotatably connected to the inside of the longitudinal rail (210), the threads at both ends of the first screw rod (230) being screwed in opposite directions, and both ends of the first screw rod (230) being threadedly connected to a positioning assembly (240).

2. The lifting tool for linear guide rail machining according to claim 1, characterized in that: The transverse positioning mechanism (300) comprises a transverse rail (310), wherein the transverse rail (310) is fixedly installed in the middle of the bottom of the base plate (100), and a second screw rod (320) is rotatably connected inside the transverse rail (310), and the threads at both ends of the second screw rod (320) are also in opposite directions, and both ends of the second screw rod (320) are threadedly connected to a sliding rod (330), and the sliding rod (330) is slidably connected to the inside of the transverse rail (310), and a receiving frame (340) is fixedly installed on the outside of the sliding rod (330).

3. The lifting tool for linear guide rail machining according to claim 2, characterized in that: The side surface of the receiving frame (340) is L-shaped, and the receiving frame (340) is configured as a stainless steel frame.

4. The lifting tool for linear guide rail machining according to claim 1, characterized in that: The transmission assembly (500) comprises a worm (510) and a worm wheel (520); the worm (510) is fixedly mounted on the middle part of the first screw (230); the worm wheel (520) is fixedly mounted on the middle part of the second screw (320); and the worm (510) and the worm wheel (520) are in transmission connection.

5. The lifting tool for linear guide rail machining according to claim 1, characterized in that: The positioning assembly (240) comprises a sliding block (241), wherein the sliding block (241) is threadedly connected to two ends of the first screw rod (230), and the sliding block (241) is slidably connected to two ends inside the longitudinal rail (210), a support rod (242) is fixedly installed at the bottom of the sliding block (241), a side plate (243) is fixedly installed at the bottom of the support rod (242), and a limit spring (244) is fixedly installed at an equal interval on the inner side of the side plate (243), and a limit plate (245) is fixedly installed at the end of the limit spring (244).

6. The lifting tool for linear guide rail machining according to claim 5, characterized in that: Support rods (246) are fixedly installed at equal intervals on the outer side of the limiting plate (245), and the outer ends of the support rods (246) penetrate the side plate (243).

7. The lifting tool for linear guide rail machining according to claim 3, characterized in that: The outer corners of the supporting frame (340), the base plate (100) and the hanging frame (400) are all arranged in an arc shape, and the overall cross-sectional shape of the hanging frame (400) is arranged in an isosceles trapezoid.

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