A pendant windproof structure

Abstract

This invention relates to the field of construction equipment technology, specifically to a windproof structure for plumb bobs, comprising a windproof tube, a cone, a dropping frame, and a rope. The dropping frame includes a central buckle and dropping plates mounted on both sides of the central buckle. The dropping plates are movably mounted on both sides of the central buckle via a pivot, and a torsion spring is nested on the outer side of the pivot of the dropping plates. The top of the windproof tube has an inner flange, and the end of the unfolded dropping plate is tightly attached to the bottom surface of the inner flange, so that the dropping frame can be used to suspend the windproof tube. The windproof tube has a windproof chamber for placing the cone inside, and a retrieval hook is provided on one side of the top. The rope passes through the central buckle and is tied to the top of the cone. It also includes an L-shaped support plate, with a clamping frame and a reel frame nested on the outer side of the L-shaped support plate. A rope reel is installed on the top of the reel frame, and the top of the rope is wound and installed on the rope reel. This invention can reduce the impact of external wind force on the stability of the cone and rope during construction line laying, and improve the stability of plumb line positioning.

Description

Technical Field

[0001] This invention belongs to the field of construction equipment technology, and specifically relates to a windproof structure for plumb bobs. Background Technology

[0002] A plumb bob, a commonly used auxiliary tool in construction surveying, vertical calibration, and positioning, is typically suspended above the construction site by a rope, using its own weight to achieve vertical positioning. In building construction, decoration construction, and installation work, construction workers often need to check and position the verticality of walls, columns, corners, or other construction parts while suspended by a plumb bob. Therefore, the stability of the plumb bob directly affects the accuracy of construction surveying and work efficiency.

[0003] In practical use, existing plumb bobs are mostly lowered directly from above the construction position by a rope. As the plumb moves downwards and reaches the working position, it is easily affected by airflow or external wind, causing it to sway. This swaying is particularly pronounced when the plumb is lowered over a long distance, in an open environment, or in the presence of significant air movement. This swaying leads to rope deviation, unstable plumb line positioning, and affects the construction workers' observation and judgment of the vertical reference, ultimately reducing the accuracy of construction measurements.

[0004] Therefore, the current solution involves adding windproof structures such as wind shields to the outside of the plumb bob to protect it from the wind. However, these wind shields are difficult to install, take up a lot of space, and require manual placement and retrieval from the construction site. This is cumbersome and inconvenient, and they cannot be used immediately after placement, making them impractical. Summary of the Invention

[0005] In view of the problems existing in the prior art, the purpose of this invention is to provide a windproof structure for a plumb bob, which can solve the above problems.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A windproof structure for a plumb bob includes a windproof tube, a cone, a dropper frame, and a rope. The dropper frame includes a central buckle and dropper plates installed on both sides of the central buckle. Two dropper plates are provided, and the two dropper plates are movably installed on both sides of the central buckle via a pivot. A torsion spring for driving the two dropper plates to move closer together is nested on the outer side of the pivot of the dropper plate. The center buckle has a through hole in the center, and the cord passes through the through hole of the center buckle and is tied to the top of the cone. The top of the windproof duct is provided with an inner flange, and the end of the unfolded duct plate is closely attached to the bottom surface of the inner flange so that the duct rack can be used to lift the windproof duct. The bottom of the windproof duct is provided with supporting legs, and the inside of the windproof duct is provided with a windproof chamber for placing the cone; A retrieval hook is provided on one side of the top of the windproof tube, and a hook gap is provided on the inner side of the retrieval hook so that the rope can pass through the hook gap and cooperate with the cone to retrieve the windproof tube. It also includes an L-shaped support plate, on the outside of which a clamping frame and a roller frame are nested. The clamping frame works with the L-shaped support plate to clamp and fix the L-shaped support plate to the top of the construction object. A rope reel is mounted on the top of the reel frame, and the top end of the rope is wound around the rope reel.

[0007] Furthermore, a top cover is screwed onto the top of the cone, and a filling chamber is provided inside the cone, with a counterweight filling material filling the corresponding filling chamber.

[0008] Furthermore, the upper surface of the top cover is provided with a knob for rotating the top cover, and the inside of the knob is provided with an inverted V-shaped hole. One end of the rope passes through the inverted V-shaped hole and is tied to the knob.

[0009] Furthermore, a limiting cover is provided on the bottom side of the center buckle. The limiting cover is used to limit the support plate and to prevent the support plate from flipping downward.

[0010] Furthermore, a locking pin is screwed onto the upper surface of the clamping frame, with the bottom end of the locking pin in close contact with the surface of the L-shaped support plate to fix the clamping frame to the L-shaped support plate.

[0011] Furthermore, a throttle shaft is installed through the rope reel and the reel frame, and the rope reel and the reel frame are movably connected by the throttle shaft. One end of the throttle shaft is provided with a throttle handle, and the other end of the throttle shaft is nested with a nut for locking the rope reel.

[0012] Furthermore, a limiting pin is screwed onto the tail end of the L-shaped support plate to prevent the reel frame from falling off.

[0013] Furthermore, when the windproof duct is hoisted down by the duct release frame, the cone is located inside the windproof chamber; when the rope continues to be lowered, the duct release plate detaches from the inner flange and automatically folds and closes under the action of the torsion spring; when it is retrieved, the rope passes through the hook gap on the inside of the retrieval hook and is pulled upward, so that the windproof duct is retrieved under the blocking action of the cone.

[0014] Compared with the prior art, the beneficial effects of the present invention are: Compared to existing technologies where the plumb bob is directly suspended and easily swayed by airflow or external wind during lowering and use, this invention incorporates a windproof tube within the rope suspension system and creates a windproof space at the corresponding position of the plumb bob to accommodate the cone. This ensures the cone remains inside the windproof tube during the suspension phase after reaching the work position. When the plumb bob is in its normal hanging state, external airflow first acts on the outside of the windproof tube, while the cone remains suspended within the windproof space. This reduces the direct impact of wind on the cone, minimizing the impact of cone swaying on the rope stability. This results in a more stable vertical reference line established during construction and layout, making it easier for construction workers to perform vertical verification and positioning operations.

[0015] Furthermore, this invention, through the cooperative relationship between the release frame and the windproof tube, allows the windproof tube to move down along with the line during the descent. After the windproof tube is in place, it is disengaged from the suspension structure, allowing the cone to remain suspended in the corresponding position inside the windproof tube for use. This eliminates the need for workers to go down to the ground to operate, enabling it to be used immediately after release. Moreover, after use, the windproof tube can be retrieved using a rope, saving time and effort and making it more convenient and practical. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the windproof duct of the present invention in its placement state; Figure 2 This is a three-dimensional structural diagram of the windproof duct of the present invention in its retracted state; Figure 3 This is a three-dimensional structural diagram of the windproof duct of the present invention; Figure 4 This is a three-dimensional structural diagram of the automatic folding of the cylinder rack according to the present invention; Figure 5 This is a three-dimensional structural diagram of the cylinder rack of the present invention after it is opened by external force; Figure 6 This is a three-dimensional exploded view of the cylinder loading frame of the present invention; Figure 7 This is a schematic diagram of the cone-shaped three-dimensional structure of the present invention; Figure 8 This is a schematic diagram of the cone-shaped three-dimensional structure after the top cover of the present invention is opened; Figure 9 A three-dimensional structural diagram of the L-shaped support plate of the present invention used in conjunction with a windproof duct; Figure 10 This is a three-dimensional exploded view of the L-shaped support plate of the present invention.

[0017] The attached diagram lists the components represented by each number as follows: 101. Windproof tube; 111. Support leg; 112. Inner flange; 113. Retrieval hook; 114. Hook gap; 115. Windproof chamber; 102. Cone; 121. Top cover; 122. Knob; 123. Inverted V-shaped hole; 124. Counterweight filler; 103. Drum release frame; 131. Center buckle; 132. Drum release plate; 133. Torsion spring; 134. Limiting cover; 104. Rope; 105. L-shaped support plate; 151. Limiting pin; 106. Clamping frame; 161. Locking pin; 107. Reel frame; 171. Rope reel; 172. Throttle shaft. Detailed Implementation

[0018] To make the objectives and advantages of this invention clearer, the invention will be specifically described below with reference to embodiments. It should be understood that the following text is merely used to describe one or more specific embodiments of the invention and does not strictly limit the scope of protection specifically claimed by the invention. Example

[0019] See Figures 1-10 A windproof structure for plumb bobs includes a windproof tube 101, a cone 102, a dropper frame 103, a rope 104, an L-shaped support plate 105, a clamping frame 106, and a reel frame 107. This structure is used for plumb bob lowering and retrieval operations in construction line setting scenarios. When the construction position is high, the lowering distance is long, and there is air movement on site, the plumb bob is prone to swaying during lowering and use, thus affecting the stability of the plumb line positioning. To address this type of application scenario, this embodiment utilizes the assembly and cooperation between the windproof tube 101, cone 102, dropper frame 103, rope 104, L-shaped support plate 105, clamping frame 106, and reel frame 107 to form a structure suitable for lowering, using, and retrieving plumb bobs at high construction locations.

[0020] See Figure 1 , Figure 2 , Figure 9 and Figure 10An L-shaped support plate 105 is positioned at the top of the workpiece. A clamping frame 106 is nested around the outside of the L-shaped support plate 105. A locking pin 161 is threaded onto the upper surface of the clamping frame 106. After the locking pin 161 is tightened downwards, its bottom end is pressed against the surface of the L-shaped support plate 105, thus forming a clamping and fixing relationship between the clamping frame 106 and the L-shaped support plate 105. A reel frame 107 is also nested around the outside of the L-shaped support plate 105 and is located at the extended section of the L-shaped support plate 105. A limiting pin 151 is threaded onto the tail end of the L-shaped support plate 105. The limiting pin 151 is located on the side of the reel frame 107 in the outward direction and is used to axially limit the reel frame 107 to prevent it from falling off the tail end of the L-shaped support plate 105. The rope reel 171 is installed on the top of the reel frame 107. A throttle shaft 172 is installed through the rope reel 171 and the reel frame 107. The rope reel 171 is movably connected to the reel frame 107 through the throttle shaft 172. A throttle is provided at one end of the throttle shaft 172, and a nut is nested at the other end of the throttle shaft 172. The top end of the rope 104 is wound and installed on the rope reel 171, thus forming the laying and winding section located on the top of the construction object.

[0021] See Figure 3 , Figure 4 , Figure 5 and Figure 6 The release frame 103 includes a central buckle 131 and two release plates 132. The two release plates 132 are movably mounted on both sides of the central buckle 131 via pivots. A torsion spring 133 is nested on the outer side of the pivot of the release plates 132. The torsion spring 133 drives the two release plates 132 to move closer to one side of the central buckle 131. The central buckle 131 has a through hole in its center for the rope 104 to pass through. A limit cover 134 is provided on the bottom side of the central buckle 131. The limit cover 134 is located below the release plates 132 and is used to provide bottom support for the release plates 132 when they are unfolded, preventing them from flipping downwards. The top of the windproof duct 101 is provided with an inner flange 112. When the two release plates 132 are unfolded to both sides, the ends of the two release plates 132 can respectively fit tightly against the bottom surface of the inner flange 112, so that a releasable support fit is formed between the release frame 103 and the windproof duct 101. The bottom of the windproof duct 101 is provided with a support leg 111, and the windproof duct 101 is provided with a windproof chamber 115, which is used to accommodate the cone 102.

[0022] See Figure 7 and Figure 8A top cover 121 is screwed onto the top of the cone 102. A knob 122 is provided on the upper surface of the top cover 121. An inverted V-shaped hole 123 is provided inside the knob 122. The lower end of the rope 104 passes through the central through hole of the central buckle 131, then through the inverted V-shaped hole 123 and is tied to the knob 122, so that the rope 104 is connected to the top of the cone 102. A filling chamber is provided inside the cone 102, and the filling chamber is filled with counterweight filler 124 to stabilize the cone 102 during descent. A retrieval hook 113 is provided on one side of the top of the windproof duct 101. A hook gap 114 is provided on the inner side of the retrieval hook 113. The hook gap 114 is used to guide the rope 104 to form a mating relationship with the top of the windproof duct 101 during the retrieval stage.

[0023] In use, first place the L-shaped support plate 105 on top of the workpiece, then nest the clamping frame 106 on the outside of the L-shaped support plate 105, and fix the clamping frame 106 to the L-shaped support plate 105 by tightening the locking nail 161; then install the reel frame 107 on the outside of the L-shaped support plate 105, and install the limiting nail 151 at the tail end of the L-shaped support plate 105 to stably limit the reel frame 107 on the L-shaped support plate 105; then wrap the top end of the rope 104 around the rope reel 171, and make the lower end of the rope 104 pass through the through hole of the center buckle 131 and the inverted V-shaped hole 123 in the knob 122 in sequence, and then tie it to the knob 122 to complete the connection between the top installation part and the lower part.

[0024] For continued use, the cone 102 is placed inside the windproof chamber 115 of the windproof duct 101, and the two release plates 132 are flipped open to both sides, so that the ends of the two release plates 132 are supported on the bottom surface of the inner flange 112. The windproof duct 101 is suspended below the center buckle 131 by the release frame 103. At this time, the limit cover 134 is located below the release plate 132 and provides support for the release plate 132. Then, the nut at the end of the throttle shaft 172 is loosened, and the throttle on the throttle shaft 172 is rotated to release the rope 104 from the rope reel 171. The cone 102, the release frame 103, and the windproof duct 101 move downward along the side of the construction site. During the lowering process, the cone 102 is located inside the windproof chamber 115, and the windproof duct 101 surrounds the outside of the cone 102. The airflow at the site first acts on the outer part of the windproof duct 101, and the cone 102 continues to move downward from the inner part of the windproof chamber 115. After the windproof duct 101 approaches the ground, the support leg 111 first contacts the ground, and the windproof duct 101 is supported by the ground. As the line rope 104 continues to be lowered, the release plate 132 gradually detaches from the bottom surface of the inner flange 112. Under the action of the torsion spring 133, the two release plates 132 fold inward toward both sides of the center buckle 131. The windproof duct 101 is released from the support of the release frame 103. The cone 102 continues to be suspended by the line rope 104 and is in the windproof chamber 115. Then, the throttle shaft 172 is rotated in the opposite direction to retract part of the line rope 104 and the rope reel 171 is locked with the nut to complete one line release process.

[0025] During retrieval, loosen the nut again and turn the throttle shaft 172 to retrieve the rope 104. The cone 102 moves upward from inside the windproof chamber 115. When the cone 102 moves to the matching position above the windproof tube 101, thread the rope 104 into the hook gap 114 inside the retrieval hook 113 and continue to pull the rope 104 upward. During the upward movement of the cone 102, it drives the windproof tube 101 to move upward synchronously. The windproof tube 101 is retrieved under the blocking action of the cone 102 and is finally retrieved to the top position of the construction site. Example

[0026] See Figure 3 , Figure 4 , Figure 5 and Figure 6This embodiment further explains the cooperation relationship between the windproof duct 101 and the release frame 103. The windproof duct 101 is a lower component used to accommodate the cone 102. The top of the windproof duct 101 is provided with an inner flange 112, and the bottom of the windproof duct 101 is provided with a support leg 111. A windproof chamber 115 is formed inside the windproof duct 101. The inner flange 112 is located inside the upper opening of the windproof duct 101 and is used to cooperate with the end of the release plate 132 after it is unfolded. The support leg 111 is located at the bottom of the windproof duct 101 and is used to support the windproof duct 101 after it is lowered to the ground. The windproof chamber 115 is located inside the windproof duct 101 and is used to provide external shielding space for the cone 102 during the lowering stage and normal use stage.

[0027] The release frame 103 is located above the windproof duct 101, and the center buckle 131 is located in the middle of the release frame 103. Two release plates 132 are symmetrically installed on both sides of the center buckle 131, and both release plates 132 can rotate relative to the center buckle 131 around their corresponding pivots. A torsion spring 133 is nested outside the pivot of the release plate 132. The elastic action of the torsion spring 133 causes the two release plates 132 to have an automatic tendency to move towards the center. Therefore, when not subjected to external unfolding action, the two release plates 132 are in a state of approaching the center buckle 131. A limiting cover 134 is provided on the bottom side of the center buckle 131. The limiting cover 134 is located below the two release plates 132 after they are unfolded. After the two release plates 132 are unfolded, they are supported by the limiting cover 134 to prevent the two release plates 132 from continuing to flip downwards.

[0028] When assembling the windproof duct 101, first open the two release plates 132 to both sides so that the ends of the two release plates 132 are outside the top diameter range of the windproof duct 101. Then move the windproof duct 101 up to a position below the release plates 132. Subsequently, adjust the ends of the two release plates 132 to contact the bottom surface of the inner flange 112, thereby forming a support connection between the windproof duct 101 and the release frame 103. When this connection is in the state of upper support and lower suspension, the windproof duct 101 can move down synchronously with the center buckle 131 and the rope 104.

[0029] When the support relationship is released, the bottom support leg 111 of the windproof duct 101 first contacts the ground, and the windproof duct 101 stops moving downward. After the rope 104 continues to be lowered, the center buckle 131 and the cone 102 continue to move downward relative to the windproof duct 101. The support position between the release plate 132 and the inner flange 112 gradually disengages. After the release plate 132 loses the support constraint of the inner flange 112, it automatically folds under the action of the torsion spring 133 and closes to the center buckle 131 side. Since the limiting cover 134 only provides downward support for the release plate 132 in the unfolded state, the release plate 132 can smoothly complete the inward folding action after disengaging from the inner flange 112. Therefore, the windproof duct 101 remains on the ground, while the cone 102 continues to be suspended inside the windproof chamber 115 by the rope 104. This coordination method allows the windproof duct 101 to be carried by the duct-laying frame 103 during the lowering stage and to automatically separate from the duct-laying frame 103 during the use stage. The entire action chain is adapted to the line-laying process on the construction site.

[0030] Additionally, a retrieval hook 113 is located on one side of the top of the windproof duct 101, and a hook gap 114 is formed inside the retrieval hook 113. During retrieval, after the rope 104 enters the hook gap 114, the force-bearing position of the rope 104 is limited by the top side of the windproof duct 101. As the rope 104 continues to rise, the windproof duct 101 can be synchronously lifted during the upward movement of the cone 102. The retrieval hook 113 and hook gap 114 are located on the body of the windproof duct 101, which does not change the suspension engagement relationship during the lowering phase of the windproof duct 101, while providing a force-bearing engagement position for the retrieval phase of the windproof duct 101. Example

[0031] See Figure 7 , Figure 8 , Figure 9 and Figure 10 This embodiment further explains the fit between the cone 102 and the top mounting part. The cone 102 is the lower body of the plumb bob. The top of the cone 102 is connected to the top cover 121 by a threaded connection. The top cover 121 is used to close the opening at the top of the cone 102 and form the upper line connection part. A knob 122 is provided on the upper surface of the top cover 121. An inverted V-shaped hole 123 is opened inside the knob 122. The end of the rope 104 passes through the inverted V-shaped hole 123 and is tied to the knob 122, so that the rope 104 is connected to the top of the cone 102. A filling chamber is provided inside the cone 102. The counterweight filler 124 is filled in the filling chamber. When suspended, the cone 102 can hang vertically downward by its own weight. After the cone 102 is placed in the windproof chamber 115, the cone 102 is located within the internal space of the windproof duct 101. The downward position of the cone 102 corresponds to the enclosure position of the windproof duct 101.

[0032] See Figure 9 and Figure 10The L-shaped support plate 105 serves as the top mounting base. A clamping frame 106 and a reel frame 107 are nested and mounted on the outer side of the L-shaped support plate 105. The clamping frame 106 is located at the clamping position between the L-shaped support plate 105 and the top of the workpiece. Locking pins 161 are screwed into the upper surface of the clamping frame 106 and press downwards against the surface of the L-shaped support plate 105, forming an adjustable clamping relationship between the clamping frame 106 and the L-shaped support plate 105. The reel frame 107 is located on the extended side of the L-shaped support plate 105. A rope reel 171 is mounted on the top of the reel frame 107. A throttle shaft 172 passes through the rope reel 171 and the reel frame 107, allowing the rope reel 171 to rotate around the throttle shaft 172. A handle is provided at one end of the throttle shaft 172, allowing construction personnel to manually rotate the throttle shaft 172 to drive the rope reel 171 to wind up and unwind the rope 104. A nut is nested at the other end of the throttle shaft 172. When the nut is tightened, it restricts the rotation of the rope reel 171; when the nut is loosened, it releases the rotation of the rope reel 171. A limit pin 151 is installed at the tail end of the L-shaped support plate 105. The limit pin 151 is located at the end of the reel frame 107 in the disengagement direction and is used to restrict the reel frame 107 from axially disengaging along the L-shaped support plate 105.

[0033] In the specific operation process, the construction workers first establish a clamping and installation relationship between the L-shaped support plate 105 and the top of the construction object, then install the reel frame 107, rope reel 171, and rope 104. The lower end of the rope 104 is connected to the cone 102, and then the windproof duct 101 and the release frame 103 are assembled. During the release of the line, the top installation part bears all the suspension force. The reel frame 107 is used to support the rope reel 171, and the rope reel 171 is used to release and wind up the rope 104. The L-shaped support plate 105 and the clamp frame 106 are used to fix the above-mentioned release and wind-winding parts above the construction position. During the retraction, the top installation part continues to bear the lifting force of the cone 102 and the windproof duct 101 during the retrieval process. Thus, the L-shaped support plate 105, clamping frame 106, reel frame 107, rope reel 171, throttle shaft 172, locking pin 161 and limiting pin 151 together constitute the top installation and line winding structure that cooperates with the lower windproof tube 101, cone 102 and tube release frame 103, enabling the entire plumb bob windproof structure to complete the continuous action process of fixing the top of the construction object, lowering the lower components, suspending during operation and recycling after use.

[0034] The working principle of this invention is as follows: In use, first place the L-shaped support plate 105 at the installation position on top of the workpiece, then fit the clamping frame 106 onto the outside of the L-shaped support plate 105. Tighten the locking pin 161 so that the bottom end of the locking pin 161 is in close contact with the surface of the L-shaped support plate 105, thereby fixing the clamping frame 106 to the L-shaped support plate 105 and making the L-shaped support plate 105 stably installed on top of the workpiece. The reel frame 107 is nested on the outside of the L-shaped support plate 105. The limiting pin 151 at the tail end of the L-shaped support plate 105 limits the reel frame 107 to prevent it from falling off. The top end of the rope 104 is wound and installed on the rope reel 171. The rope reel 171 is movably installed on the top of the reel frame 107 through the throttle shaft 172. The throttle at one end of the throttle shaft 172 is used to drive the rope reel 171 to rotate, and the nut nested at the other end of the throttle shaft 172 is used to lock the rope reel 171.

[0035] During the preparation of the line laying process, first, the lower end of the rope 104 is passed through the through hole in the center of the center buckle 131, and then one end of the rope 104 is passed through the inverted V-shaped hole 123 inside the knob 122 and tied to the knob 122; the top cover 121 is screwed on the top of the cone 102, and the filling chamber inside the cone 102 is filled with counterweight filler 124 so that the cone 102 has a downward counterweight effect; then the cone 102 is placed in the windproof chamber 115 inside the windproof tube 101, and the laying frame 103 is installed in conjunction with the windproof tube 101.

[0036] In specific operation, the two release plates 132 are rotated outward around the pivots on both sides of the center buckle 131. The torsion springs 133 nested on the outer side of the pivots of the release plates 132 are in a charged state during this process. The ends of the released plates 132 after being unfolded are close to the bottom surface of the inner flange 112 at the top of the windproof duct 101, so that the release frame 103 provides a lifting support for the windproof duct 101. The limiting cover 134 provided on the bottom side of the center buckle 131 provides a limiting support for the release plates 132 when they are unfolded and prevents them from flipping downward. At this time, the cone 102 is located inside the windproof chamber 115, and the support legs 111 at the bottom of the windproof duct 101 are set downward, so that the windproof duct 101 can be lowered to the ground to form a support.

[0037] When hoisting is required, first loosen the nut at the other end of the throttle shaft 172 so that the rope reel 171 can rotate relative to the reel frame 107; then turn the throttle at one end of the throttle shaft 172 to drive the rope reel 171 to rotate and release the rope. The rope 104 is gradually lowered, thereby driving the cone 102 and the release frame 103 together with the windproof tube 101 to move downward. During the lowering process, the windproof tube 101 is kept suspended by the release frame 103, and the cone 102 is located inside the windproof chamber 115. The windproof tube 101 forms a windproof shield around the cone 102, reducing the interference of external wind force on the cone 102 before it is lowered to the use position.

[0038] After the windproof duct 101 is lowered to near the ground and supported by the support leg 111, the rope 104 continues to be lowered. At this time, since the windproof duct 101 is supported by the ground, the support between the release plate 132 and the inner flange 112 is released, and the release plate 132 is separated from the inner flange 112. Then, under the action of the torsion spring 133, the two release plates 132 automatically fold and close to the center buckle 131, thereby releasing the suspension support state of the windproof duct 101 by the release frame 103. Then, the handle on the throttle shaft 172 is rotated in the opposite direction to retrieve part of the rope 104, so that the cone 102 remains inside the windproof chamber 115 and the plumb bob enters the normal use state. During this process, the windproof duct 101 provides wind protection for the cone 102. Combined with the gravity provided by the counterweight filler 124 of the cone 102 itself, it helps to reduce the swaying of the rope 104 by the wind.

[0039] When it is time to end use and recycle, first turn the handle on the throttle shaft 172 to retrieve the rope 104, and pull the cone 102 upward from inside the windproof chamber 115; then pass the rope 104 through the hook gap 114 inside the recycling hook 113, so that the rope 104 and the top side of the windproof tube 101 are engaged; then continue to pull the rope 104 upward, and the cone 102 will block and pull the windproof tube 101 during the upward movement, so that the windproof tube 101 is retrieved upward together under the blocking action of the cone 102; after the windproof tube 101 and the cone 102 are retrieved to the top of the construction site, lock the rope reel 171 with the nut at the other end of the throttle shaft 172, and a typical use and recycling process is completed.

[0040] The above description is merely a preferred embodiment of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described or explained in this invention are implemented according to conventional methods in the art unless otherwise specified or limited.

Claims

1. A windproof structure for a plumb bob, comprising a windproof tube (101), a cone (102), a bob holder (103), and a rope (104), characterized in that: The canister rack (103) includes a center buckle (131) and canister plates (132) installed on both sides of the center buckle (131). There are two canister plates (132). The two canister plates (132) are movably installed on both sides of the center buckle (131) through a pivot. A torsion spring (133) for driving the two canister plates (132) to come together is nested on the outside of the pivot of the canister plate (132). The center buckle (131) has a through hole in the center, and the rope (104) passes through the through hole of the center buckle (131) and is tied to the top of the cone (102); The top of the windproof duct (101) is provided with an inner flange (112), and the end of the unfolded duct plate (132) is closely attached to the bottom surface of the inner flange (112) so that the duct rack (103) can be used to lift the windproof duct (101). The bottom of the windproof duct (101) is provided with a support leg (111), and the inside of the windproof duct (101) is provided with a windproof chamber (115) for placing the cone (102). A retrieval hook (113) is provided on one side of the top of the windproof tube (101), and a hook gap (114) is provided on the inner side of the retrieval hook (113) so that the rope (104) can pass through the hook gap (114) and cooperate with the cone (102) to retrieve the windproof tube (101). It also includes an L-shaped support plate (105), on the outside of which a clamping frame (106) and a roller frame (107) are nested. The clamping frame (106) works with the L-shaped support plate (105) to clamp and fix the L-shaped support plate (105) to the top of the construction object. The top of the reel frame (107) is equipped with a rope reel (171), and the top end of the rope (104) is wound around the rope reel (171).

2. The windproof structure for a plumb bob according to claim 1, characterized in that: The top of the cone (102) is fitted with a top cover (121) by screwing it on. The cone (102) has a filling chamber inside, and the cone (102) is filled with a counterweight filler (124) inside the corresponding filling chamber.

3. The windproof structure for a plumb bob according to claim 2, characterized in that: The upper surface of the top cover (121) is provided with a knob (122) for rotating the top cover (121). The knob (122) has an inverted V-shaped hole (123) inside. One end of the rope (104) passes through the inverted V-shaped hole (123) and is tied to the knob (122).

4. The windproof structure for a plumb bob according to claim 1, characterized in that: The bottom side of the center buckle (131) is provided with a limiting cover (134), which is used to limit the support plate (132) and to prevent the support plate (132) from flipping downward.

5. The windproof structure for a plumb bob according to claim 1, characterized in that: The upper surface of the clamping frame (106) is fitted with a locking pin (161) by thread engagement. The bottom end of the locking pin (161) is in close contact with the surface of the L-shaped support plate (105) to fix the clamping frame (106) to the L-shaped support plate (105).

6. The windproof structure for a plumb bob according to claim 1, characterized in that: A throttle shaft (172) is installed through the rope reel (171) and the reel frame (107). The rope reel (171) and the reel frame (107) are movably connected by the throttle shaft (172). One end of the throttle shaft (172) is provided with a throttle, and the other end of the throttle shaft (172) is nested with a nut for locking the rope reel (171).

7. The windproof structure for a plumb bob according to claim 1, characterized in that: The tail end of the L-shaped support plate (105) is fitted with a limiting pin (151) by thread engagement, which is used to prevent the reel frame (107) from falling off.

8. The windproof structure for a plumb bob according to claim 1, characterized in that: When the windproof duct (101) is lowered by the duct release frame (103), the cone (102) is located inside the windproof chamber (115); when the rope (104) is lowered further, the duct release plate (132) is disengaged from the inner flange (112) and automatically folds and closes under the action of the torsion spring (133); when it is retrieved, the rope (104) passes through the hook gap (114) on the inside of the retrieval hook (113) and is pulled upward, so that the windproof duct (101) is retrieved under the blocking action of the cone (102).

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