Strut of a scaffolding

Abstract

The invention relates to a brace, in particular a guardrail brace of a scaffold, and to the scaffold with the brace. The brace has a bore 110 at at least one of its two ends for receiving a toggle lever connection on a scaffold upright for attaching the brace. The bore has at least one slot-shaped extension 130 extending at an angle α to the longitudinal axis of the brace and towards the near end of the brace for guiding a toggle lever 214 rotatably mounted on the toggle lever connection 212. To reduce the risk of the brace accidentally detaching from the toggle lever connection when the brace is mounted on the toggle lever connection in a pivoting manner, the bore is extended towards the near end of the brace in the form of an elongated slot.

Description

[0001] The invention relates to a strut, in particular a railing strut of a scaffolding, and the scaffolding with the strut. Scaffolding and associated struts are generally known in the prior art. A strut is essentially a tube with a bore at both ends for attachment to the rocker arm connections of two scaffolding posts.

[0002] In order to compensate for possible length or spacing tolerances in erected scaffolding, it is known to design at least one of the two holes in the railing strut as an elongated hole.

[0003] Furthermore, a scaffold with a railing strut is disclosed in German Offenlegungsschrift DE 10 2004 055 394 A1. The railing strut disclosed therein has a bore at at least one of its two ends for receiving a rocker arm connection on a scaffolding post of a scaffold when the railing strut is hooked onto the rocker arm connection. The circular bore has at least one slot-shaped extension extending at an angle α to the longitudinal axis of the railing strut and in the direction of the near end of the railing strut. This extension serves to pass through a rocker arm pivotally mounted on the rocker arm connection when the railing strut is to be pushed onto or pulled off the rocker arm connection without opening the pivotally mounted rocker arm. This is particularly advantageous when the railing strut is to be pulled off from a position from which the rocker arm cannot be reached.The railing strut disclosed in the above-mentioned publication enables the rocker arm and slot-shaped extension to be aligned and thus the railing strut to be removed by simply pivoting the railing strut, which is suspended on one side and hangs freely, from the vertical by the angle α.

[0004] During the assembly or dismantling of such a scaffold as described above, it can happen that a railing strut, after being pushed onto or removed from a rocker arm connection at one end, is not immediately pushed onto or removed from another rocker arm connection at the other end, but initially hangs or swings freely from one rocker arm connection. This creates the risk that the slot-shaped extension of the hole in the railing strut will inadvertently align with the rocker arm, and that the railing strut will then become undesirably detached from the rocker arm connection and fall uncontrollably.

[0005] German patent application DE 10 2014 224 002 A1 discloses a railing post and a scaffold with a railing post. The railing post, also called a strut, has a hole at both ends for receiving and passing through a pin-shaped holder with a mushroom head on a scaffolding post. The holes at both ends of the strut are each designed in the form of a guide rail with different guide rail sections, each of which is aligned differently to the longitudinal axis of the strut. For assembly or disassembly of the strut, it is moved translationally relative to the scaffolding posts of the construction site as dictated by the guide rails at both ends.

[0006] The invention is based on the object of developing a known strut of a scaffolding and a corresponding scaffolding in such a way that the

[0007] The risk of the strut becoming loose from a rocker arm connection when the strut is mounted in a pendulum manner on the rocker arm connection is reduced.

[0008] This object is achieved by the subject matter of claim 1. Accordingly, the strut according to the invention is characterized in that the bore is widened towards the near end of the strut in the form of an elongated hole.

[0009] The term "near end of the strut" is explained as follows: The holes in the struts are usually assigned to one end of the strut. The "near end of the strut"

[0010] The "end" of the strut is the end that is closest to a particular hole.

[0011] The claimed special design of the bore in the form of an elongated hole, which extends from the original bore with the radially extending slot-shaped extensions to the near end of the strut, offers the advantage that the strut slides into the end of the elongated hole facing the near end of the strut when the strut is suspended from the rocker arm connection in a pendulum manner. In this position, there is no longer any risk for the scaffolding strut that the slot-shaped extensions in the strut will overlap with the rocker arm at the rocker arm connection, and that the strut could then detach from the rocker arm connection.Rather, the strut must first be lifted so that it is positioned essentially in the end of the elongated hole facing away from the near end of the strut, and the strut must be positioned at a suitable angle, in which the slot-shaped extensions in the strut are aligned with the orientation of the rocker arm, in order to be able to pull or release the strut from the rocker arm connection. Because the invention requires a further active movement in addition to pivoting—namely, lifting against gravity—to remove the scaffolding strut from its attachment, the inadvertent falling out of the strut is significantly more difficult, thus significantly increasing safety during scaffolding assembly.

[0012] The length of the major axis of the slot is always greater than the length of its minor axis. This is essentially the definition of the slot.

[0013] According to a first embodiment of the invention, the length of the rocker arm is greater than the length of the main axis of the elongated hole. The rocker arm is pivotally mounted on the rocker arm connection by means of a short and a long lever arm, wherein the short lever arm is greater than the radius of the rocker arm connection. The different lengths of the lever arms mean that the long lever arm always drops downwards due to gravity. This said length of the rocker arm, in combination with the different lengths of the lever arms, offers the advantage that the strut suspended from the rocker arm connection with the elongated hole cannot detach from the rocker arm connection, even if the strut is pivoted relative to the longitudinal direction of the rocker arm. If the length of the rocker arm were shorter than the main length of the elongated hole, the rocker arm could tilt into the elongated hole and thus enable the strut to be released or pulled off the rocker arm connection.

[0014] According to a further embodiment, the minor axis of the elongated hole of the present invention is larger than the enveloping outer diameter of the rocker arm connection. The term "enveloping outer diameter" refers to the diameter of a circle that forms the "envelope" around any cross-section of the rocker arm connection with the rocker arm rotatably mounted thereon, when the rocker arm is aligned with its longitudinal axis parallel to the longitudinal axis of the rocker arm connection. Simply put, this boundary condition means that the minor axis of the elongated hole must be large enough to accommodate the rocker arm connection together with the rocker arm mounted thereon.

[0015] The angle between the radial extension of the slot-shaped extension and the longitudinal axis of the strut is between 0 and 90°.

[0016] The above-mentioned object is further achieved by a scaffold according to claim 5. The scaffold is characterized by the strut designed according to the invention. The advantages of this scaffold correspond to those mentioned above with reference to the strut.

[0017] Five figures are attached to the description, where Figure 1 shows a scaffold with a strut according to the invention; Figure 2 shows a scaffold post of the scaffold with an open rocker arm connection; Figure 2a shows a cross-sectional view of the end face of the rocker arm connection with rocker arm; Figure 3 shows the strut designed according to the invention; Figure 4 shows the pendulum suspension of the strut; and Figure 5 shows the strut according to the invention, in particular a railing strut, in an installation situation on the scaffold. shows.

[0018] The invention is described in more detail below with reference to the figures mentioned in the form of exemplary embodiments. In all figures, identical technical elements are designated by identical reference numerals.

[0019] Figure 1 shows a section of a scaffold 200. Specifically, a scaffold post 210 can be seen, to which a rocker arm connection 212 is permanently connected. A rocker arm 214 is rotatably mounted at the end of the rocker arm connection 212 remote from the post. The strut 100 is pushed onto the rocker arm connection 212 and locked there by means of the rocker arm 214.

[0020] Figures 2 and 2a show the arrangement of the rocker arm connection 212 on the scaffold post 210 in detail. The diameter of the enveloping circle around the cross-section of the rocker arm connection is designated here by reference symbol d. The rocker arm bears the reference symbol 214, and its length is designated by LK.

[0021] Figure 3shows the inventive design of the strut 100 in detail. The strut 100 has a bore 110 at at least one of its ends for receiving the rocker arm connection 212 when the strut 100 is pushed onto the rocker arm connection and suspended there. The bore 110 has slot-shaped extensions 130 extending radially from its original center point M for passing the rocker arm 214 through when the strut 100 is pushed onto the rocker arm connection 212. The slot-shaped extensions 130 extend outward toward the proximal end 120 of the strut.

[0022] According to the invention, the bore 110 is widened in the form of an elongated hole toward the near end 120 of the strut. Therefore, the length LH of the major axis of the elongated hole is greater than the length LN of a minor axis. The length LH of the major axis of the elongated hole 110 is less than the length LK of the rocker arm 214. The length of the minor axis is greater than the enveloping outer diameter d of the rocker arm connection 212 with the rocker arm 214 mounted thereon when the rocker arm is aligned in the direction of the longitudinal axis of the rocker arm connection. That is, when the rocker arm is deflected by approximately 90° relative to its pendulum position due to gravity. The angle α between the radial extension of the slot-shaped extension 130 and the longitudinal axis L of the strut 100 is between 0 and 90°.

[0023] It is important that the elongated hole extends from the center point M of the original bore to the near end 120 of the strut 100—and not in the opposite direction. If the elongated hole were to extend in the opposite direction, the advantage mentioned above in the general part of the description, namely reliably preventing the strut from detaching from the rocker arm connection, would no longer be guaranteed.

[0024] For the description of the Figures 4 and 5 Please refer to the figure listing. List of reference symbols

[0025] 100Strut 110Hole (slotted hole) 120Near end of the railing strut 130Slot-shaped extension of the hole 200Scaffolding 210Scaffolding post 212Toggle lever connection 214Toggle lever αAngle LLongitudinal axis of the railing strut LHLength of the major axis of the slotted hole LKLength of the rocker arm LNlength of the minor axis of the slotted hole dDiameter of an enveloping circle around the cross section of the rocker arm connection with rocker arm

Claims

1. A brace (100) of a scaffolding (200), wherein the brace has the following: a bore (110) at each of its two ends for receiving a respective rocker arm connection (212) on a scaffold leg (210) of the scaffolding (200) while hanging the brace (100), wherein both bores (110) each have at least one slotted expansion (130) extending at an angle (α) to the longitudinal axis (L) of the brace and-proceeding from their original midpoints M-radially in the direction of the respective near end (120) of the brace for passing through a respective rocker arm (214) rotatably mounted to the rocker arm connection (212) and characterized in that the two bores (110) are each expanded toward their near end (120) of the brace in the form of an oblong hole.

2. The brace (100) according to claim 1, characterized in that the length (LH) of the main axis of the oblong hole is greater than the length (LN) of its secondary axis; and that the length of the rocker arm (214) is greater than the length (LH) of the main axis of the oblong hole.

3. The brace (100) according to one of the preceding claims, characterized in that the length (LH) of the main axis of the oblong hole is greater than the length (LN) of its secondary axis; and that the secondary axis is greater than the diameter (d) of an enveloping circle around the cross section of the rocker arm connection with the rocker arm (214) rotatably mounted thereto if the longitudinal axis of the rocker arm is aligned parallel to the longitudinal axis of the rocker arm connection (212).

4. The brace (100) according to one of the preceding claims, characterized in that the following holds true for the angle (α) between the radial extension of the slotted expansion (130) and the longitudinal axis (L) of the brace (100): 0<α<+ / -90°.

5. A scaffolding (200), comprising: at least one scaffold leg (210) with a rocker arm connection (212) and a rocker arm (214) rotatably mounted to the end of the rocker arm connection (212) far from the leg; and at least one brace (100) according to one of the preceding claims.

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