Object falling prevention device for small and medium holes in floor slab

Abstract

The invention discloses an object falling prevention device for a small hole in a floor, which is used for being detachably mounted on the hole for temporary plugging and comprises a fixed seat, a movable cylinder, a spring and a locking assembly, the fixed seat comprises a sleeve and a cover plate arranged on the outer wall of the upper end of the sleeve; the side wall of the lower part of the movable cylinder is provided with a through groove, and the lower end of the movable cylinder extends out of the sleeve in a matched manner; the spring is positioned in the sleeve and two ends of the spring respectively press the sleeve and the movable cylinder; the locking assembly comprises a handle, a rotating shaft connected to the lower end of the handle and a locking piece arranged on the lower portion of the rotating shaft, the handle and the rotating shaft are rotatably arranged in the movable cylinder, the locking piece extends out of the through groove and is located outside the sleeve, and the extending length of the locking piece can be adjusted along with rotation of the rotating shaft. The device is simple in structure, convenient to operate, capable of rapidly completing assembly and disassembly, reliable in installation and in-place in protection, does not occupy the upper operation activity space, and does not hinder construction of other working procedures of an upper structure.

Description

Technical Field

[0001] The invention belongs to the field of construction engineering, and in particular relates to a device for preventing objects from falling through small holes in a floor slab. Background Art

[0002] In construction projects, small or square holes are often reserved on the floor slabs for the convenience of construction or process requirements. These small and medium-sized holes are reserved for a long time, are small in size, and are numerous. In less standardized construction operations, these holes are often overlooked, which can easily cause injuries from objects falling from the holes. In standardized construction operations, these holes need to be temporarily blocked. Currently, temporary blocking mostly uses cover plates or foam glue. The cover plates are fixed by heavy objects, which are not only easy to loosen, but also take up a lot of space and affect other subsequent processes. The foam glue needs to be chiseled off later, which adds to the process. Summary of the invention

[0003] The purpose of the present invention is to provide a device for preventing objects from falling through small holes in floor slabs. The device has a simple structure, is easy to operate, can be quickly loaded and unloaded, is reliably installed, provides adequate protection, does not occupy upper working space, and does not hinder other construction processes of the upper structure.

[0004] The technical solution adopted by the present invention is: A device for preventing objects from falling in small holes in a floor slab is used for being detachably installed on the hole for temporary blocking, and comprises a fixing seat, a movable cylinder, a spring and a locking assembly; the fixing seat comprises a sleeve and a cover plate arranged on a circle of the outer wall of the upper end of the sleeve, the sleeve is used to be inserted into the hole, and the cover plate is used to be placed on the top surface of the floor slab and cover the gap between the sleeve and the hole; the upper end of the movable cylinder is arranged in the sleeve without being disengaged, the lower side wall is provided with a through groove, and the lower end cooperates to extend the sleeve, which can close the lower end of the sleeve; the spring is located in the sleeve and the two ends press down the sleeve and push up the movable cylinder respectively; the locking assembly comprises a handle, a rotating shaft connected to the lower end of the handle and a locking piece arranged at the lower part of the rotating shaft, the handle and the rotating shaft are rotatably arranged in the movable cylinder, the locking piece extends out of the through groove and is located outside the sleeve, the locking piece can adjust the extension length as the rotating shaft rotates, a human hand can reach into the sleeve to operate the handle, and the handle can rotate after overcoming the spring force to press down the movable cylinder to extend the locking piece and lock it to the bottom surface of the floor slab.

[0005] Preferably, the locking member includes a fixed rod and a movable rod, one end of the fixed rod is fixed to the rotating shaft, and the other end is hinged to one end of the movable rod, the other end of the movable rod extends out of a through slot, the through slot is opened a certain distance along the circumference of the side wall of the movable cylinder, the upper and lower surfaces of the through slot are sliding fitting surfaces of the movable rod, and the front and rear end surfaces are limiting surfaces of the movable rod, when the rotating shaft drives the fixed rod to rotate, the movable rod swings around the fixed rod under the limiting action of the limiting surface, thereby adjusting the extension length.

[0006] Preferably, the fixed rod and the movable rod are hinged by a single ear piece and a double ear piece, and the fixed rod and the movable rod are at the same height as a whole.

[0007] Preferably, both the fixed rod and the movable rod are provided with a notch structure for avoiding the edge contour of the other party within the relative swing range of the two rods.

[0008] Preferably, the two groups of locking elements and through grooves are evenly distributed around the axis.

[0009] Preferably, a retaining ring is provided on the inner side wall of the upper end of the movable cylinder, and a positioning support is provided on the bottom surface of the lower end. The lower end of the rotating shaft is inserted into the positioning support, and the upper end is axially limited by the handle and the retaining ring in turn. The handle is matched with the inner side wall of the movable cylinder.

[0010] Preferably, the handle closes the opening at the upper end of the movable cylinder, and the top surface of the handle is provided with a groove or protrusion for easy operation.

[0011] Preferably, a limiting ring is provided on the inner side wall of the upper end of the sleeve, a flange is provided on the outer side wall of the upper end of the movable cylinder, the spring is sleeved on the movable cylinder with the lower end resting on the inner bottom surface of the sleeve and the upper end resting on the flange, and the flange initially rests on the limiting ring.

[0012] Preferably, the cover plate is annular as a whole, and its single-side cross-section is trapezoidal, and the area of ​​the cover plate is thicker than the peripheral area.

[0013] Preferably, the fixing seat, the movable cylinder and the locking assembly are made of hard plastic or metal.

[0014] The beneficial effects of the present invention are: The device has a simple structure and is easy to operate. It can quickly complete loading and unloading, and it is reliable to install and provide adequate protection. During installation, the sleeve is first inserted into the hole so that the cover plate is placed on the top surface of the floor slab and covers the gap between the sleeve and the hole. Then, a person manually extends a sleeve to operate the handle, first presses the handle downward to overcome the spring force to press the movable cylinder downward, then keeps the pressure downward and rotates the handle to extend the locking piece, then releases the handle, and the spring reset drives the locking piece to lock on the bottom surface of the floor slab. At this time, the cover plate and the locking piece are tightly clamped on the upper and lower sides of the floor slab under the action of the spring, and the entire device is reliably installed at the hole. In addition, the cover plate, the sleeve, and the movable cylinder completely seal the upper end of the hole, and the protection is in place. During disassembly, a person manually extends a sleeve to operate the handle, first presses the handle downward to overcome the spring force to press the movable cylinder downward, then keeps the pressure downward and rotates the handle in the opposite direction to shorten the locking piece, then releases the handle, and the spring reset drives the movable cylinder and the locking piece to move upward into the hole, and the entire device can be removed. In this device, only the cover plate is attached to the top surface of the floor slab, and the other components are all located below the top surface of the floor slab, which does not occupy the upper working space and does not hinder the construction of other processes of the upper structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1It is a front cross-sectional view of the device for preventing objects from falling through small holes in a floor slab in the first embodiment of the present invention, which is in an initial uninstalled state.

[0016] Figure 2 It is a front cross-sectional view of the device for preventing objects from falling through small holes in a floor slab in the first embodiment of the present invention, which is in an installed state.

[0017] Figure 3 It is a plan view of the locking member when it is shortened in the first embodiment of the present invention.

[0018] Figure 4 It is a plan view of the locking member when it is extended in the first embodiment of the present invention.

[0019] Figure 5 It is a top view of the device for preventing objects from falling through small holes in a floor slab in the first embodiment of the present invention.

[0020] Figure 6 It is a schematic diagram of the initial installation of the device for preventing objects from falling through small holes in a floor slab in the first embodiment of the present invention.

[0021] Figure 7 It is a schematic diagram of the device for preventing objects from falling through small holes in a floor slab after installation in the first embodiment of the present invention.

[0022] Figure 8 It is a schematic diagram of the device for preventing objects from falling through small holes in a floor slab after installation in the second embodiment of the present invention.

[0023] In the figure: 1- Floor; 2-fixed seat; 21-sleeve; 211-limiting ring; 22-cover plate; 3-movable cylinder; 31-through groove; 32-retaining ring; 33-positioning support; 34-flange; 4- Spring; 5-locking assembly; 51-handle; 52-rotating shaft; 53-locking piece; 531-fixed rod; 532-movable rod. DETAILED DESCRIPTION

[0024] The present application is further described below in conjunction with the accompanying drawings and embodiments.

[0025] Embodiment 1 This embodiment discloses a device for preventing objects from falling in small holes in a floor slab, which is used to be detachably installed on the hole for temporary blocking. Figures 1 to 7As shown: the device includes a fixed seat 2, a movable cylinder 3, a spring 4 and a locking assembly 5. The fixed seat 2 includes a sleeve 21 and a cover plate 22. The lower side wall of the movable cylinder 3 is provided with a through groove 31. The locking assembly 5 includes a handle 51, a rotating shaft 52 and a locking member 53. Among them: the sleeve 21 is used to be inserted into the hole, the cover plate 22 is arranged around the outer wall of the upper end of the sleeve 21, and the cover plate 22 is used to be placed on the top surface of the floor 1 and cover the gap between the sleeve 21 and the hole. Figure 1 , Figure 2 , Figure 6 and Figure 7 The upper end of the movable cylinder 3 is not disengaged from the sleeve 21, and the lower end of the sleeve 21 is extended with the sleeve 21, which can close the lower end of the sleeve 21, see Figure 1 , Figure 2 , Figure 6 and Figure 7 The spring 4 is located in the sleeve 21 and the two ends press down the sleeve 21 and the upper movable cylinder 3, see Figure 1 and Figure 2 The rotating shaft 52 is connected to the lower end of the handle 51, and the locking member 53 is provided at the lower part of the rotating shaft 52. The handle 51 and the rotating shaft 52 are rotatably provided in the movable cylinder 3. The locking member 53 extends out of the through slot 31 and is located outside the sleeve 21. The locking member 53 can adjust the extension length as the rotating shaft 52 rotates. A human hand can reach into the sleeve 21 to operate the handle 51. The handle 51 can rotate after overcoming the force of the spring 4 to press down the movable cylinder 3 so that the locking member 53 is extended and locked to the bottom surface of the floor 1. Figures 1 to 4 , Figure 6 and Figure 7 .

[0026] The loading and unloading process of the device is: During installation: first insert the sleeve 21 into the hole, so that the cover plate 22 is placed on the top surface of the floor slab 1 and covers the gap between the sleeve 21 and the hole; then put the hand into the sleeve 21 to operate the handle 51, first press the handle 51, that is, overcome the force of the spring 4 to press down the movable cylinder 3, then keep pressing down and rotate the handle 51, that is, let the locking piece 53 extend; then release the handle 51, the spring 4 resets and drives the locking piece 53 to lock on the bottom surface of the floor slab 1, at this time, the cover plate 22 and the locking piece 53 are tightly clamped on the upper and lower sides of the floor slab 1 under the action of the spring 4, and the entire device is reliably installed at the hole, and the cover plate 22, the sleeve 21, and the movable cylinder 3 completely close the upper end of the hole to provide adequate protection.

[0027] During disassembly: a person reaches into the sleeve 21 to operate the handle 51, first pressing down the handle 51, that is, overcoming the force of the spring 4 to press down the movable cylinder 3, then keeping the pressure down and rotating the handle 51 in the opposite direction, that is, shortening the locking member 53; then releasing the handle 51, the spring 4 returns to its original position and drives the movable cylinder 3 and the locking member 53 to move upward into the hole, and the entire device can be removed.

[0028] It can be seen from the above scheme that: the device has a simple structure, is easy to operate, can quickly complete loading and unloading, and is reliably installed and fully protected; moreover, in the device, only the cover plate 22 is attached to the top surface of the floor 1, and the remaining components are all located below the top surface of the floor 1, which does not occupy the upper working space and does not hinder the construction of other processes of the upper structure; moreover, in the device, each component can be directly selected or mass-produced, which is suitable for large-scale standardized production and promotion.

[0029] Regarding the locking member 53, in this embodiment, preferably: Figures 1 to 4 As shown, the locking member 53 includes a fixed rod 531 and a movable rod 532. One end of the fixed rod 531 is fixed to the rotating shaft 52, and the other end is hinged to one end of the movable rod 532. The other end of the movable rod 532 extends out of the through slot 31. The through slot 31 is opened along the circumferential direction of the side wall of the movable cylinder 3 for a distance. The upper and lower surfaces of the through slot 31 are sliding matching surfaces of the movable rod 532, and the front and rear end surfaces are limiting surfaces of the movable rod 532. When the rotating shaft 52 drives the fixed rod 531 to rotate, the movable rod 532 swings around the fixed rod 531 under the limiting action of the limiting surface to adjust the extension length. This embodiment utilizes the rotating shaft 52 and the fixed rod 531. 1. The cooperation between the movable rod 532 and the through groove 31 realizes the extension and shortening of the locking member 53 in the rotating state, with a delicate structure and reliable transmission; and the fixed rod 531 and the movable rod 532 can be hinged by a single ear piece and a double ear piece, and the fixed rod 531 and the movable rod 532 are at the same height as a whole, making the transmission more stable and reliable; and the fixed rod 531 and the movable rod 532 can be provided with a notch structure for avoiding the edge contour of each other within the relative swing range of the two, so that the swing range is increased, thereby increasing the extension range of the locking member 53, and being suitable for holes of more sizes.

[0030] In this embodiment, if Figures 1 to 4 As shown, two groups of locking members 53 and through grooves 31 are evenly distributed around the axis, which ensures the reliability of installation and locking and avoids unbalanced loads. The selection of two groups in this embodiment is the simplest structure under the premise of ensuring reliability. In actual situations, more groups can be selected, but the cost will be higher and the structure will be more complicated.

[0031] Regarding the installation of the handle 51 and the retaining ring 32, in this embodiment, preferably: Figure 1 and Figure 2 As shown, a retaining ring 32 is provided on the inner side wall of the upper end of the movable cylinder 3, and a positioning support 33 is provided on the bottom surface of the lower end. The lower end of the rotating shaft 52 is inserted into the positioning support 33, and the upper end is axially limited by the handle 51 and the retaining ring 32 in turn. The handle 51 is matched with the inner side wall of the movable cylinder 3 on all sides, so that the handle 51 and the retaining ring 32 can be rotatably installed.

[0032] Regarding the structure of the handle 51, in this embodiment, preferably: Figure 1 , Figure 2 and Figure 5 As shown, the handle 51 closes the upper opening of the movable cylinder 3, and the top surface of the handle 51 is provided with a groove or protrusion for easy operation. By using the handle 51 to close the upper opening of the movable cylinder 3, dust, debris, etc. can be prevented from falling into the movable cylinder 3 and affecting the action of the locking member 53.

[0033] Regarding the installation of the spring 4 and the movable cylinder 3, in this embodiment, preferably: Figure 1 and Figure 2 As shown, a limiting ring 211 is provided on the inner wall of the upper end of the sleeve 21, and a flange 34 is provided on the outer wall of the upper end of the movable cylinder 3. The spring 4 is sleeved on the movable cylinder 3 with the lower end resting on the inner bottom surface of the sleeve 21 and the upper end resting on the flange 34. Initially, the flange 34 rests on the limiting ring 211. This structure can not only provide installation space for the spring 4, but also prevent the movable cylinder 3 from slipping out of the sleeve 21.

[0034] Regarding the structure of the cover plate 22, in this embodiment, preferably: Figure 1 , Figure 2 , Figure 6 and Figure 7 As shown, the cover plate 22 is annular as a whole, and its single-side cross-section is trapezoidal. The area of ​​the cover plate 22 is thicker than the peripheral area. The cover plate 22 is thickened in the central area that bears the most load, and thinned in the peripheral area that bears less load, ensuring that it can provide bearing capacity while reducing its own weight, which is in line with the direction of structural optimization.

[0035] In this embodiment, the fixing seat 2, the movable cylinder 3 and the locking assembly 5 can be made of hard plastic or metal. Of course, other suitable materials are also acceptable and are not limited.

[0036] In this embodiment, if Figure 6 and Figure 7 As shown, the size of the sleeve 21 is selected according to the size of the hole, and it fits the hole completely or has only a very small gap. This setting requires the corresponding sleeve 21 to be made according to the common hole size, but it is not suitable for square holes, nor is it suitable for the construction of non-standard holes (with size errors).

[0037] Embodiment 2 The present embodiment discloses a device for preventing objects from falling in small holes in floor slabs, which is used to be detachably installed on the holes for temporary blocking. Its structure and principle are basically the same as those of the first embodiment, except that the size of its sleeve 21 is not selected according to the size of the hole, but a correspondingly smaller sleeve 21 is made according to the size of the currently common holes (whether square or round). In this way, even if the hole is square or the hole is not constructed in a standard manner (there is a size error), the sleeve 21 can be inserted into the hole, and the cover plate 22 covers the gap between the sleeve 21 and the hole, which also plays a protective role.

[0038] The embodiments described above are part of the embodiments of the present application, rather than all of the embodiments. The detailed description of the embodiments of the present application is not intended to limit the scope of the present application for protection, but merely represents the selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

Claims

1. A device for preventing objects from falling through small holes in a floor, characterized in that: The invention relates to a locking device for locking a hole in a removable manner and for temporarily blocking a hole. The locking device comprises a fixing seat, a movable cylinder, a spring and a locking assembly. The fixing seat comprises a sleeve and a cover plate arranged on a circle of the outer wall of the upper end of the sleeve. The sleeve is used to be inserted into the hole, and the cover plate is used to be placed on the top surface of the floor and cover the gap between the sleeve and the hole. The upper end of the movable cylinder is arranged in the sleeve without being disengaged, the lower side wall is provided with a through groove, and the lower end cooperates with the sleeve to extend out, which can close the lower end of the sleeve. The spring is located in the sleeve and its two ends respectively press down the sleeve and push up the movable cylinder. The locking assembly comprises a handle, a rotating shaft connected to the lower end of the handle and a locking piece arranged at the lower part of the rotating shaft. The handle and the rotating shaft are rotatably arranged in the movable cylinder, the locking piece extends out of the through groove and is located outside the sleeve, and the locking piece can adjust the extension length as the rotating shaft rotates. A human hand can reach into the sleeve to operate the handle, and the handle can rotate after overcoming the spring force to press down the movable cylinder to extend the locking piece and lock it to the bottom surface of the floor.

2. The device for preventing objects from falling through small holes in a floor slab as claimed in claim 1, characterized in that: The locking piece includes a fixed rod and a movable rod. One end of the fixed rod is fixed to the rotating shaft, and the other end is hinged to one end of the movable rod. The other end of the movable rod extends out of a through slot, and the through slot is opened for a certain distance along the circumference of the side wall of the movable cylinder. The upper and lower surfaces of the through slot are sliding fitting surfaces of the movable rod, and the front and rear end surfaces are limiting surfaces of the movable rod. When the rotating shaft drives the fixed rod to rotate, the movable rod swings around the fixed rod under the limiting action of the limiting surface to adjust the extension length.

3. The device for preventing objects from falling through small holes in a floor slab as claimed in claim 2, characterized in that: The fixed rod and the movable rod are hinged by a single ear piece and a double ear piece, and the fixed rod and the movable rod are at the same height as a whole.

4. The device for preventing objects from falling through small holes in a floor slab as claimed in claim 3, characterized in that: The fixed rod and the movable rod are both provided with a notch structure for avoiding the edge contour of the other party within the relative swing range of the two rods.

5. The device for preventing objects from falling through small holes in a floor slab according to any one of claims 1 to 4, characterized in that: The two groups of locking pieces and the through grooves are evenly distributed around the axis.

6. The device for preventing objects from falling through small holes in a floor slab as claimed in claim 1, characterized in that: A retaining ring is arranged on the inner side wall of the upper end of the movable cylinder, and a positioning support is arranged on the bottom surface of the lower end. The lower end of the rotating shaft is inserted into the positioning support, and the upper end is axially limited by the handle and the retaining ring in turn. The handle is matched with the inner side wall of the movable cylinder.

7. The device for preventing objects from falling through small holes in a floor slab as claimed in claim 1 or 6, characterized in that: The handle closes the upper opening of the movable cylinder, and the top surface of the handle is provided with a groove or a protrusion for easy operation.

8. The device for preventing objects from falling through small holes in a floor slab as claimed in claim 1, characterized in that: A limiting ring is arranged on the inner side wall of the upper end of the sleeve, a flange is arranged on the outer side wall of the upper end of the movable cylinder, the spring is sleeved on the movable cylinder, the lower end of the spring abuts against the inner bottom surface of the sleeve, and the upper end abuts against the flange, and the flange abuts against the limiting ring initially.

9. The device for preventing objects from falling through small holes in a floor slab as claimed in claim 1, characterized in that: The cover plate is annular in shape as a whole, and its single-side cross section is trapezoidal, and the area of ​​the cover plate is thicker than the peripheral area.

10. The device for preventing objects from falling through small holes in a floor slab as claimed in claim 1, characterized in that: The fixing seat, movable cylinder and locking assembly are made of hard plastic or metal.

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