Safety piece for the wedge lock in the forestry floor pulley

Abstract

Multi-part construction [1], hereinafter referred to as “safety piece for the wedge lock in the forestry ground pull”, consisting of a shaped piece [2] and a clamping device [6], characterized in that the shaped piece [2] is equipped with a wedge pocket [3] and the clamping device [6] only secures the “dead” rope strand [11], which protrudes again from a wedge lock [9], by clamping.

Description

[0001] The securing piece [1] according to the invention for the wedge lock in forestry soil tension, in short securing piece [1], consists of a shaped piece [2], preferably made of aluminum, and a clamping device [6], preferably designed as a clamping bracket [7] with nuts [8] and a clamping block as a milled recess in the shaped piece [2]. The securing piece [1] according to the invention protects a wedge lock [9], e.g. a symmetrical rope lock according to DIN EN 13411-7 or an asymmetrical rope lock according to DIN EN 13411-6, from the rear against incoming loads and against loosening and / or loss of the wedge

[12] of the aforementioned wedge lock [9] under dynamic loads in forestry soil tension. The fitting [2] is equipped with a pocket [3] from the mounting side to the wedge lock [9], into which a wedge

[12] emerging from the back of a wedge lock can be inserted, thus protecting the shape of this fitting [2] against being forced open, e.g. by a cable glider.Both the live rope strand

[10] and the dead rope strand

[11] of a wedge end connection [9] are passed through this shaped piece [2]. Bores [4 and 5] for these two rope strands [10 and 11] are arranged in such a way that the securing piece [1] according to the invention is centered and rests against the wedge lock [9]. Preferably, the edge of this pocket [3] for ropes [10 and 11] and wedge

[12] in the shaped piece [2] is designed in such a way that the securing piece [1] rests flat against the rear side

[13] of the wedge lock [9] and can transfer forces acting from the rear side

[13] of the wedge lock to the housing of the wedge lock

[13] . As a result, the wedge lock [9] mounted with the securing piece [1] according to the invention can also be fully loaded from its rear side. The clamping device [6] only clamps the dead end of the rope

[11] which protrudes from a wedge lock [9] at the back.When correctly installed, the locking piece [1] rests firmly and positively against the back of the wedge lock [9] and is secured against rotation by its special shape. Preferably, the clamping device [6] is designed so that the correct position of the dead rope end

[11] of the wedge lock end connection [9] can be visually checked without the use of tools.

[0002] For steel ropes of forestry cable winches used in forestry ground traction, the following rope end connections are currently available on the market: Aluminium press connection according to DIN EN 13411-3 with bent back loop Aluminium press connection according to DIN EN 13411-3 with bent back loop and thimble Flemish eye in accordance with DIN EN 13411-3 with impact press connection or press connection Symmetrical rope lock according to DIN EN 13411-7 Asymmetric rope lock according to DIN EN 13411-6

[0003] All of the aforementioned types of end connections commonly used in forestry have in common that they cannot, or cannot fully, bear loads from the back without additional equipment, or that they must not be loaded. Operators of forestry cable winches often work with cable gliders, choker chains or choker ropes. A common error in logging with forestry cable winches is that one or more logs at the same time are only attached to cable gliders that can move on the main cable. In the event of a blocking load, the cable gliders, which are fully loaded, slide against the back of the respective cable end connection in the forestry ground tension. In this case, the entire tensile load of the forestry cable winch is supported via the cable glider on the back of the rope end connection. The rope end connection must then absorb the force from its back up to the maximum tensile force of the forestry cable winch, especially in the event of a sudden blockage of a log.The same stress occurs if the operator fails to shut off the forestry winch's cable retraction in time when retracting the traction cable, causing the cable end connection to be pulled backwards against the forestry winch's cable inlet. Forestry winches generally do not have a limit switch, so in this case, too, the end connection is subjected to excessive loads and / or damage.

[0004] DE202022001317U1 solves the aforementioned problems in connection with rope end connections consisting of crimping with aluminum compression sleeves according to or based on DIN EN 13411-3 and is known as state of the art.

[0005] A rope end connection on the forestry cable winch using a wedge lock [9], e.g., according to DIN EN 13411-6 and DIN EN 13411-7, offers the advantage, compared to a crimp connection, that it can be installed on-site by a skilled operator using only simple tools. Shortening a damaged forestry cable winch main rope is easy and can be done at any time without major effort, which can contribute to the safe operation of a forestry cable winch.

[0006] When using wedge locks [9], e.g. according to DIN EN 13411-6 and DIN EN 13411-7, without the safety piece [1] according to the invention, there is a risk that the rope glider, another component or the rope inlet of the forestry cable winch will press the safety wedge

[12] in the wedge lock [9] and open or loosen the wedge end connection [9]. Dynamically loaded wedge end connections according to DIN EN 13411-6 and DIN EN 13411-7 must be mounted in accordance with these DIN EN such that, for example, a longer piece of rope

[11] protrudes from the unloaded side of the rope lock [9]. With this piece of rope, the so-called "dead" end

[11] , a loop is made according to DIN EN 13411-6 and DIN EN 13411-7, on which one or more U-shaped rope clamps are mounted. During dynamic operation, the rope loop and bow rope clamp secure the rope end against slipping out and the wedge

[12] in the rope lock [9], which may become loose, against falling out.The aforementioned securing method of the "dead" rope end

[11] , required by DIN EN 13411-6 and DIN EN 13411-7, is not practical for forestry ground traction, as the loop protruding in the direction of pull cannot withstand the harsh conditions of forestry ground traction. The consequence in forestry practice is that rope locks [9] are generally installed and used without the securing measures required by the respective DIN EN. Rope locks [9] according to DIN EN 13411-6 and DIN EN 13411-7, which are used in forestry ground traction without additional securing measures, are considered unsafe and are therefore not permitted, especially in combination with the use of rope gliders.

[0007] This inventive design [1] solves the aforementioned problems in conjunction with a securing piece [1] for the wedge lock [9], e.g., according to DIN EN 13411-6 or DIN EN 13411-7, in that the inventive securing piece [1] transfers a load occurring from the rear of the rope end connection [9] via the shaped piece [2] to the rear of the housing

[13] of the wedge lock [9] belonging to the end connection, and as a result, the wedge end connection [9], e.g., according to DIN EN 13411-6 and DIN EN 13411-7, can also be fully loaded from its rear side in conjunction with the inventive securing piece [1]. Nevertheless, the wedge end connection [9] remains fully loadable in conjunction with the inventive securing piece [1] when the load is attached directly to the bolt of the wedge lock [9]. The safety piece [1] according to the invention protects the wedge

[12] protruding from the wedge lock [9] against contact and pressing, e.g.by a rope glider. The operator of a forestry cable winch can work with rope gliders without having to simultaneously attach a load by wrapping it with the winch's main rope, as is common practice in Germany. Connecting elements can be attached to both the rope gliders and the bolt of the wedge end connection [9], which enable work with choker ropes or choker chains and thus protect the forestry cable winch's main rope. Due to the full rear load capacity of the wedge end connection [9] by the inventive securing piece [1] up to the nominal load capacity of the wedge end connection [9], the wedge end connection [9] remains protected against damage to the wedge end connection [9] even if it accidentally strikes the winch rope inlet. Like the wedge lock [9], the inventive securing piece [1] can be installed on site by a skilled operator using only simple tools.

[0008] A key feature of this securing piece [1] according to the invention is that the clamping device [6] only secures the "dead" rope strand end

[11] of the wedge end connection [9], while the "live" rope strand

[12] is only passed through the securing piece [1] according to the invention without load. Preferably, the clamping device [6] is designed such that the "dead" rope strand

[11] is firmly and releasably connected to the shaped piece [2] in a force-fitting and / or form-fitting manner, in particular by a screw connection. The design of the clamping device [6] in the form of a U-shaped clamping bracket [7] with an applied thread and nuts [8] is particularly advantageous.

[0009] Preferably, the clamping device [6] of the securing piece [1] according to the invention is designed in such a way that the correct position and clamping of the dead rope strand

[11] to be secured can be visually checked without the aid of tools.

[0010] Preferably, the shaped piece [2] of the securing piece [1] according to the invention is made of a material, preferably high-strength aluminum, which protects the back of the wedge lock housing

[13] from damage and is nevertheless light and sufficiently stable to transmit the forces occurring. List of reference symbols: 1 safety piece for the wedge lock in the forestry ground pull, in short “safety piece” consisting of 2 and 6 2 fitting 3 wedge pockets 4 Hole for “live” rope strand 5 Hole as clamp for “dead” rope strand 6 clamping device consisting of 5, 7 and 8 7 clamps 8 mother 9 Wedge lock consisting of 12 and 13 10 “live” rope strands 11 “dead” rope strand 12 wedge 13 wedge lock housing 14 disc (not shown) Fig. 1 safety piece for the wedge lock in the forestry ground pull with rope and rope lock Fig. 2 safety piece for the wedge lock in the forestry ground pull QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] DE 202022001317U1

[0004] Cited non-patent literature

[0000] DIN EN 13411-7 [0001, 0002, 0006] DIN EN 13411-6 [0001, 0002, 0006] DIN EN 13411-3

[0002]

Claims

[1] Multi-part construction [1], hereinafter referred to as “safety piece for the wedge lock in forestry soil traction”, consisting of a shaped piece [2] and a clamping device [6], characterized by that the fitting [2] is equipped with a wedge pocket [3] and the clamping device [6] only secures the “dead” rope strand [11], which again protrudes from a wedge lock [9], by clamping. [2] Safety piece for the wedge lock in the forestry soil pull [1] according to claim 1, characterized bythat the wedge pocket [3] in the shaped piece [2] is designed in such a way that, due to its elongated oval shape, the securing piece [1] is centered on the ropes projecting from the wedge lock [9], the "live" [10] and the "dead" rope strand [11], in such a way that the edge of the wedge pocket [3] lies flush with the wedge lock housing [13] on the rope exit side of the wedge lock [9] and the rope strands [10 and 11] as well as the wedge [12] projecting from the wedge lock [9] can be accommodated in the wedge pocket [3] in such a way that the wedge [12] cannot be forced open by the securing piece [1]. [3] Safety piece for the wedge lock in the forestry soil pull [1] according to claim 1 and / or 2, characterized by that the clamping device [6] only secures the “dead” rope strand [11] by means of a force-locking connection, while the “live” rope strand [10] is only guided through a hole [4] through the fitting [2]. [4] Safety piece for the wedge lock in the forestry soil pull [1] according to one of claims 1 to 3, characterized by that the clamping device [6] is designed in such a way that the position and clamping of the “dead” rope strand [11] can be checked without the use of tools. [5] Safety piece for the wedge lock in the forestry soil pull [1] according to one of claims 1 to 4, characterized by that the clamping device [6] is designed as a U-shaped bracket [7] with threads at the bracket ends and two nuts [8]. The counter-support of this special clamping device [6] is manufactured by milling and two holes without connection to the hole for the "live" rope strand [4]. [6] Safety piece for the wedge lock in the forestry soil pull [1] according to one of claims 1 to 5, characterized bythat the clamping device [6] is clamped to the "dead" rope strand [11] during assembly of the associated wedge lock [9] and subsequent tightening of the securing piece [1] in a form-fitting manner against the rear edge of the wedge lock housing [13] and as a result the securing piece [1] can fully transfer a load accumulating from the rear into the rope end connection in the form of a wedge lock [9]. [7] Safety piece for the wedge lock in the forestry soil pull [1] according to one of claims 1 to 6, characterized by that the shaped piece [2] is round, symmetrical to the axis that runs through the two cable centers [10 and 11] and is designed to be gentle on the steel cable and cable gliders due to its shape and the avoidance of sharp edges. [8] Safety piece for the wedge lock in the forestry soil pull [1] according to one of claims 1 to 7, characterized by that the fitting [2] is made of high-strength aluminum. [9] Safety piece for the wedge lock in the forestry soil pull [1] according to one of claims 1 to 8, characterized by that the safety piece [1] can be additionally mounted with a round disc made of steel or aluminum [14] between the safety piece [1] and the rope gliders to protect the safety piece [1].

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