Lever type tool suitable for removing nailed plate for formwork
By designing a tool that utilizes the principle of lever, including longitudinal arms and fulcrum elements, the problems of damage to the plate and beam and heavy force during plate removal in the prior art are solved, and the effect of easily separating the plate and beam is achieved.
Patent Information
- Application Number
- CN202280101237.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2022-10-21
- Publication Date
- 2025-05-30
AI Technical Summary
The prior art is easy to cause damage to the plate and beam when the plates of the beams nailed to the mold frame are removed, and a large force is required.
A tool that utilizes the principle of leverage is designed, including two longitudinal arms and fulcrum elements. The longitudinal arms are connected by articulations, and the head has a fulcrum element, and the edges of the pushing and supporting sections are used to contact the plate and beam, which easily separates the plate and beam by leverage.
Effectively reduces damage to the plate and reduces the force exerted by the operator, allowing easy separation and unlocking of the plate and beam without bending the nails or damaging the plate.
Smart Images
Figure CN120077184A_ABST
Abstract
Description
Field of the Invention
[0001] The invention relates to a tool adapted to remove a plate of a beam that is nailed to a formwork. Background Art
[0002] Formworks are usually constructed with a plate that is nailed to the formwork beam and needs to be subsequently removed for reuse in a new formwork.
[0003] Generally, a hammer or a tool called a crowbar is used as a lever and inserted between the plate to be unlocked and the beam. However, this formwork removal method itself has many drawbacks. The main drawback of such a tool is that it usually causes considerable damage to the plate and the beam. Another method of removing the plate is by rotating the beam, but then the nails will be twisted and additional force is required to remove the nails.
[0004] Therefore, there is still a need for a solution to remove the plate to reduce damage to the plate and reduce the force on the operator's side. Summary of the Invention
[0005] The object of the present invention is to provide a tool using the lever principle that helps to remove a plate of a beam that is nailed to a formwork. Specifically, the tool is adapted for use with a formwork of a type of beam that includes, in addition to a central body, two protrusions or side flanges that can serve as supports to provide a lever action against a top member such that at least the protrusions are longitudinally misaligned with the end of the central body intended to be adjacent to the plate (i.e., the protrusions serving as supports are not located at the upper end of the beam as seen in the use state of the beam).
[0006] The tool is characterized in that it includes two longitudinal arms that are symmetrically arranged with respect to a middle plane and are pivotally connected by an end (specifically, the lower end, i.e., the end that the user holds in the normal use position) such that when the longitudinal arms are in an inclined position with respect to the middle plane, the two longitudinal arms define an open position, and when the longitudinal arms are in a position parallel to the middle plane, the two longitudinal arms define a closed position. In addition, the upper ends of the longitudinal arms include two heads, which can be a bent part of the same arm or an element added to the arm. In addition, two adjacent faces of the heads have fulcrum elements, which can be a part of the same head or an element added to the head. These fulcrum elements are configured such that: when the longitudinal arms are in their use state where they cannot be further closed (i.e., when the fulcrum pieces or heads are in contact with the beam on both sides), the space defined between the longitudinal arms is equal to or slightly larger than the width of the central body of the beam and smaller than the width between the ends of the lateral protrusions.
[0007] In addition, each fulcrum element is at least provided with:
[0008] - A pushing section, the edge of which is used to push the plate located above the beam. The pushing section is positioned adjacent to the non-articulated end of the corresponding longitudinal arm (i.e., as seen in the normal use position of the pushing section, the pushing section forms the upper end of the fulcrum piece and is adjacent to the upper end of the corresponding longitudinal arm at the same time), and
[0009] - A supporting section, the edge of which is used to rest on the corresponding lateral protrusion of the beam. The supporting section is positioned at the longitudinal end opposite to the pushing section (i.e., is positioned at the lower end of the fulcrum piece, as seen in its normal use position).
[0010] Specifically, the supporting section and / or the pushing section define a lever resistance arm through a portion protruding in a direction perpendicular to the longitudinal direction of the longitudinal arm and parallel to the intermediate plane (i.e., the minimum or perpendicular distance between the support point of the supporting section and the line of action of the force resisting the lever movement). At the same time, the fulcrum has a smaller dimension defined by the vertical length (or minimum distance) existing between the end face of the supporting section and the end face of the pushing section. In order to fit the fulcrum piece into the space (especially in the initial position of the lever movement), the vertical length is slightly smaller than the available space between the lateral protrusion and the end of the central body intended to be adjacent to the plate.
[0011] As expected, the fulcrum piece has a dimension larger than the dimension of the vertical length in a direction inconsistent with the vertical length, such that when the supporting section rests on the lateral protrusion and the user exerts a lever action through the longitudinal arm (that is, pushes the articulated end of the longitudinal arm so that the articulated end of the longitudinal arm pivots along the path contained in the intermediate plane relative to the supporting section), the pushing section pushes the plate vertically relative to the corresponding beam, so that the beam and the plate can be easily separated and unlocked without bending the nails or damaging the plate.
[0012] In a preferred embodiment, the pushing section and / or the supporting section includes a cam-shaped edge, and the geometry of the cam-shaped edge is configured such that: after the start of the lever movement, the lever resistance arm generated between the contact points of the fulcrum piece gradually increases as its contact points move away from the vertical length. For this purpose, the fulcrum has a geometry such that the distance between the end surface of the pushing section and the end surface of the supporting section changes proportionally to the increase of the resistance arm as the contact point of the resistance arm moves away from the vertical length. In other words, the more obvious the change in the distance between the pushing section and the supporting section, the closer it is to the vertical length. In this way, the pushing section gradually transmits the thrust force to the plate along the movement of the lever piece.
[0013] In a possible embodiment, the longitudinal arm includes a stop element having an opening, the stop element being configured such that the distance by which the fulcrum element can be separated is not greater than the width of the beam. For example, the stop element includes a pin and a transverse hole, the pin having a threaded nut at its end, the transverse hole passing through the longitudinal arm and receiving the pin.
[0014] Preferably, the longitudinal arm includes a metal profile, while the fulcrum element includes a sheet piece that is fixed to the longitudinal arm and is manufactured by a cutting process, such as by laser or by die-cutting.
[0015] It can be inferred that, in order for the edges of the two pushing segments of the lever tool to contact the plate, the distance between the edges of the two pushing segments of the lever tool must be greater than the width of the upper part of the beam. For example, when the beam also has an upper-side protrusion, the geometry of the fulcrum piece must be such that the pushing segments protrude laterally enough to contact the plate. Description of the Drawings
[0016] Figure 1 is a front view of a first example of an embodiment of the lever tool.
[0017] Figure 2 is a side view of a first embodiment of the lever tool.
[0018] Figure 3 is a side view of three travel movements during the application of the lever tool when separating the beam from the plate.
[0019] Figure 4 is a front view of a second example of an embodiment of the lever tool.
[0020] Figure 5 is a side view of a second embodiment of the lever tool. Detailed Embodiments
[0021] Referring to the above-mentioned drawings and according to the reference numerals used, three examples of embodiments of the lever tool (1, 1') will be described below.
[0022] As can be seen in Figure 1 , the present lever tool (1, 1') is adapted to use a mold frame of the type of beam (V), the beam (V) including a central body (CV) and two lateral protrusions (RV), the lateral protrusions (RV) serving as supports to provide a lever action against the plate (T). In this case, the beam (V) has an inverted T shape, that is, the beam (V) only includes two lateral protrusions (RV), the two lateral protrusions (RV) being longitudinally aligned with the lower end of the central body (CV), as shown in the use state of the beam (V).
[0023] This embodiment of the lever tool (1, 1') includes two longitudinal arms (11), which are symmetrically arranged with respect to the middle plane and are hingedly connected by the lower ends of the two longitudinal arms (11). On the other hand, the upper ends of the longitudinal arms (11) include two heads (12), and in these embodiments, the heads (12) include welded parts of metal profiles. In addition, two adjacent faces of the heads (12) have fixed pivot elements (13, 13'), and the pivot elements (13, 13') are configured such that: when the longitudinal arms (11) are in the use state where they can no longer be closed, the spacing is defined to be similar to the width of the central body (CV) of the beam (V) and less than the width between the ends of the lateral protrusions (RV). In addition, each pivot element (13, 13') is provided with:
[0024] - Pushing sections (131, 131'), the edges of which are used to push the plate (T) located above the beam (V), and the pushing sections (131, 131') are positioned adjacent to the upper ends of the corresponding longitudinal arms (11), and
[0025] - Supporting sections (132, 132'), the edges of which are used to rest on the corresponding lateral protrusions (RV), and the supporting sections (132, 132') are positioned at the longitudinal ends opposite to the longitudinal ends of the pushing sections (131, 131'), that is, at the lower ends of the pivot members (13, 13').
[0026] Figure 1 A first example of the lever tool (1) is shown, in which the supporting section (132) defines a lever resistance arm by means of a portion (1321) protruding perpendicular to the longitudinal direction of the longitudinal arm (11) and parallel to the middle plane. In order to enable the pivot member (13) to be fitted into the available space (E) between the lateral protrusion (RV) and the plate (T) at the start of the lever movement, the smaller dimension part of the pivot member (13) is slightly smaller than the space (E), and the smaller dimension part is defined by the vertical length (D) existing between the edge of the supporting section (132) and the edge of the pushing section (131).
[0027] As Figure 2 shown, the supporting section 132 of this first embodiment includes a cam-shaped edge, and the distance from the edge of the pushing section 131 increases smoothly as the supporting section 132 moves away from the line of the vertical length D.
[0028] As Figure 3At the travel times a), b) and c) shown of the lever tool (1), when both support segments (132) of the lever tool (1) are supported on the lateral projections (RV), and the user exerts a levering action through the longitudinal arm (11), the pushing segment (131) vertically pushes the plate (T) relative to the corresponding beam (V), thereby enabling the beam (V) and the plate (T) to be easily separated and unlocked without bending the nail (C) or damaging the plate (T). In addition, due to the cam shape, the lever resistance arm generated between the contact points of the fulcrum member (13) increases smoothly as the lever movement progresses, so the acting force is progressive.
[0029] Figure 4 and Figure 5 A second embodiment of the lever tool (1') is shown in Figure 5 . In this embodiment, the edge of the pushing segment (131') is cam-shaped, and the pushing segment (131') defines a lever resistance arm by means of a portion (1311') that projects in a direction perpendicular to the longitudinal direction of the longitudinal arm (11') and parallel to the intermediate plane. As in the previous embodiment, the vertical length (D') existing between the edge of the support segment (132') and the edge of the pushing segment (131') is slightly smaller than the available space (E') between the lateral projection (RV') and the plate (T). Figure 4 A second type of beam (V') is also shown, which is of I-shaped, that is to say, the beam (V') includes two upper side projections and two lower side projections (RV'), as shown in the use position of the beam (V'). In order for the edges of the two pushing segments (131') to contact the plate (T), the distance between the edges of the two pushing segments (131') must be greater than the width of the upper side projection. In this way, when both support segments (132') are supported on the lower side projection (RV'), and the user exerts a levering action through the longitudinal arm (11'), the pushing segment (131') transmits the force to the plate (T).
[0030] As can be seen, the longitudinal arms (11, 11') of both embodiments include a stop element (14, 14') having an opening, and the stop element (14, 14') is configured such that the separable distance of the fulcrum elements (13, 13') is not greater than the width of the beams (V, V'). Specifically, the stop element (14) includes a pin and a transverse hole, the pin has a threadable nut at its end, and the transverse hole passes through the longitudinal arms (11, 11') and receives the pin.
Claims
1. A lever tool (1) suitable for removing a plate (T) nailed to a beam (V) of a die holder, the beam (V) being of the type including a central body (CV) and at least one lateral protrusion (RV) on each side of the central body (CV), the two lateral protrusions (RV) being longitudinally aligned with each other and not aligned with the end of the central body (CV) adjacent to the plate (T), the lever tool (1) being characterized in that the lever tool (1) includes two longitudinal arms (11), the longitudinal arms (11) being symmetrically arranged with respect to a middle plane, and the longitudinal arms (11) being hingedly connected by one of the longitudinal ends of the longitudinal arms (11), thereby defining an open position and a closed position, in the open position, the longitudinal arms (11) being in an inclined position with respect to the middle plane, in the closed position, the longitudinal arms (11) being in a position parallel to the middle plane, the other longitudinal ends of the longitudinal arms (11) including two heads (12), the adjacent faces of the heads (12) having fulcrum elements (13), the fulcrum elements (13) being configured such that: when the longitudinal arms (11) are in a use state where they cannot be further closed, the space defined between the longitudinal arms (11) is equal to or greater than the width of the central body (CV) of the beam (V), and the space defined between the longitudinal arms (11) is less than the width between the ends of the two lateral protrusions (RV), each fulcrum element (13) being provided with: - A pushing section (131), the edge of the pushing section (131) being for pushing the plate (T) located above the beam (V), the pushing section (131) being positioned adjacent to the non-hinged end of the corresponding longitudinal arm (11), and - A supporting section (132), the edge of the supporting section (132) being for being supported on the corresponding lateral protrusion (RV), the supporting section (132) being positioned at the longitudinal end opposite to the longitudinal end of the pushing section (131), wherein, the pushing section (131) and / or the supporting section (132) define a lever resistance arm by means of a portion (1311) protruding perpendicular to the longitudinal direction of the longitudinal arm (11) and parallel to the middle plane, wherein one of the dimensions of the fulcrum member (13) is defined by a vertical length (D) existing between the edge of the pushing section (131) and the edge of the supporting section (132), the vertical length (D) being slightly less than the space (E) that can be obtained between the lateral protrusion (RV) and the end of the central body (CV) adjacent to the plate (T).
2. The lever tool (1) suitable for removing a nailed plate (T) according to claim 1, characterized in that, The edges of the support section (132) and / or the part (1311) of the pushing section (131) are cam-shaped such that the lever resistance arm gradually increases as the contact point of the edges of the support section (132) and / or the part (1311) of the pushing section (131) moves away from the line of the vertical length (D).
3. The lever tool (1) suitable for removing the nailed plate (T) according to claim 2, wherein, the more obvious the change in the distance between the pushing section (131) and the support section (132), the closer the vertical length (D) is to the contact point.
4. The lever tool (1) suitable for removing the nailed plate (T) according to any one of the preceding claims, wherein, the longitudinal arm (11) includes a stop element (14) having an opening, and the stop element (14) is configured such that the distance by which the fulcrum element (13) can be separated is not greater than the width of the beam (V).
5. The lever tool (1) suitable for removing the nailed plate (T) according to claim 4, wherein, the stop element (14) includes a pin and a transverse hole, the pin has a threadable nut at its end, the transverse hole passes through the longitudinal arm (11), and the transverse hole receives the pin.
6. The lever tool (1) suitable for removing the nailed plate (T) according to any one of the preceding claims, wherein, the longitudinal arm (11) includes a metal profile.
7. The lever tool (1) suitable for removing the nailed plate (T) according to any one of the preceding claims, wherein, the fulcrum element (13) includes a sheet-like member, the sheet-like member is fixed to the longitudinal arm (11), and the sheet-like member is manufactured by a cutting process.
8. The lever tool (1) suitable for removing the nailed plate (T) according to any one of the preceding claims, wherein, the distance between the edges of the two pushing sections (131') is greater than the width of the upper part of the beam (V).