Search

EP-4737374-A1 - TOOL FOR RELEASING A BELT

EP4737374A1EP 4737374 A1EP4737374 A1EP 4737374A1EP-4737374-A1

Abstract

Tool for releasing a belt of a belt elevator from its belt tensioning clamp in which it is clamped by means of a wedge, around which the end of a belt is guided, wherein the tool is designed to reach over the belt tensioning clamp so that a compressive force generated - on the side of the belt tensioning clamp facing away from the belt - between it and the tool can be transmitted to the wedge in such a way that the latter is released from its seat.

Inventors

  • SELEK, Mesut
  • YILDIZ, OGUZHAN
  • ERGEN, Baris
  • Demirba , Aytu

Assignees

  • Wittur Holding GmbH

Dates

Publication Date
20260506
Application Date
20241030

Claims (14)

  1. Tool (1) for releasing a belt (2) of a belt elevator from its belt tensioning clamp (3) in which it is clamped by means of a wedge (101), around which the end of a belt (2) is guided, characterized in that the tool (1) is designed to reach over the belt tensioning clamp (3) so that a compressive force generated - on the side of the belt tensioning clamp (3) facing away from the belt (2) - between it and the tool (1) can be transmitted to the wedge (101) in such a way that the latter is released from its seat.
  2. Tool (1) for releasing a belt (2) from its belt tensioning clamp (3), according to claim 1, characterized in that the tool (1) has a tab (4) which is applied to the wedge (101) from below and is designed in a way that it can push the wedge (101) upwards out of the wedged position.
  3. Tool (1) according to one of the preceding claims, characterized in that the tool (1) has an L-shape with a long leg (5a) and a short leg (5b), the long leg (5a) having a cutout (6) into which the tab (4) formed by the long leg (5a) extends.
  4. Tool (1) according to one of the preceding claims, characterized in that the tab (4) is provided on the side of the cutout (6) that is facing away from the short leg (5b) .
  5. Tool (1) according to one of the preceding claims, characterized in that the cutout (6) forms a supporting tab (7) on its side facing to the short leg (5b).
  6. Tool (1) according to one of the preceding claims, characterized in that the cutout (6) is so large that the bracket (12) of the belt tensioning clamp (3) is received by it.
  7. Tool (1) according to one of the preceding claims, characterized in that the tab (4) is so small that it can be fitted between the folded belt (2) that forms a loop and/or into the bottom opening of the belt tensioning clamp (3) .
  8. Tool (1) according to one of the preceding claims, characterized in that the cutout (6) is so large that - in the mounted state of the tool (1) - the tab (4) on the lower side touches the wedge (101) and the supporting tab (7) on the upper side simultaneously touches the upper side of the bracket (12) of the belt tensioning clamp (3) or is in direct proximity thereto, or alternatively that the supporting tab (7) touches the upper side of the bracket (12) of the belt tensioning clamp (3) and the tab (4) on the lower side simultaneously touches the wedge (101) or is in direct proximity thereto.
  9. Tool (1) according to one of the preceding claims, characterized in that the tool (1) has, at least on its short leg (5b), a cutout (8) which is wide enough to receive the rod (9) of the belt tensioning clamp (3) therein.
  10. Tool (1) according to one of the preceding claims, characterized in that the short leg (5b) has at least one, preferably exactly two, threaded holes (10) for screwing in a screw (11) in each case.
  11. Tool (1) according to one of the preceding claims, characterized in that the respective axis of the threaded hole (10) runs parallel to the back wall of the bracket (12) of the belt tensioning clamp (3) and/or to the plane of the large surface of the long leg (5a) of the tool (1).
  12. Tool (1) according to one of the preceding claims, characterized in that the respective axis of the threaded holes (10) runs in such a way that it cuts the upper side of the bracket (12) of the belt tensioning clamp (3) or cuts the back and/or side walls of the bracket (12) of the belt tensioning clamp (3).
  13. Tool (1) according to one of the preceding claims, characterized in that the tool (1) is a one-piece integral part.
  14. Tool (1) according to one of the preceding claims, characterized in that the tool (1) is an L-shaped bent sheet metal.

Description

FIELD OF INVENTION The invention relates to a tool for releasing a belt according to the generic term of claim 1. TECHNICAL BACKGROUND In rope or belt traction systems, both ends of the rope or belt are usually fixed to a component with a means known as "belt attachment means", often in the form of a so called "belt tensioning clamp". These belt tensioning clamps are connected to the fixed components above the elevator shaft in 2/1 drive systems, while they are connected to the elevator car and counterweight in 1/1 systems. An example of a commonly used belt tensioning clamp according to the state of the art is shown in Fig. 1 for the example of a belt as a traction means. In terms of the rope or belt attachment, an angled wedge is a common application for a belt tensioning clamp. Therefore, the traction means is connected by passing between an angled housing of the belt tensioning clamp and an angled wedge placed inside the housing (see Fig. 2). The rope or belt placed between the wedge and the housing gets stuck when being pulled, thanks to its conical wedge shape. So, the traction means does not even move, if the traction means is not attached with an additional clamp. An additional clamp (see Fig. 1) is usually attached on the traction means for safety and in order to fix the loop that is formed at the end of the traction means. Nevertheless, the traction means is expected not to slip under load even without the clamp connection. The belts of interest here are generally provided with an elastic coating that increases their traction capacity. When being clamped, the coating gets squeezed under load and causes the belt to stuck strongly to the belt tensioning clamp. This makes it very difficult to remove the belt from the belt tensioning clamp even if the belt is unloaded and it is very hard to push the belt by hand in the opposite direction in order to unstuck it. Therefore, it is problematic especially in belt traction systems to remove the belt, as it sticks tightly to the belt tensioning clamp. If a special solution is not created, it is very difficult to remove the belt from the belt tensioning clamp during installation or maintenance and the belt must be cut. Cutting the belt means that the belt cannot be reused even if it has not yet reached the end of its service life. In addition, cutting the belt means that the existing belt tensioning clamp cannot be reused in the system or at least not be reused without additional work. OBJECT OF THE INVENTION Accordingly, it is an object of the invention to provide a tool with which a belt of a belt traction system can be removed more easily from its belt tensioning clamp. SOLUTION ACCORDING TO THE INVENTION A solution to this problem is provided by the main claim. Claim 1 provides a tool for releasing a belt of a belt elevator from its belt tensioning clamp in which it is fixed by means of a wedge. According to the invention the tool is designed to reach over the belt tensioning clamp so that a compressive force is generated - on the side of the belt tensioning clamp facing away from the belt - between it and the tool can be transmitted to the wedge in such a way that the latter is released from its seat. In this way, a very easy and cost-efficient way of removing the wedged belt can be provided through the tool according to the invention. The key point is that a tool for belt releasing is created that makes the belt tensioning clamp itself becoming a tool part, since the belt tensioning clamp is a part of the chain that transmits the loosening force from its place of generation to its place of application. PREFERRED DESIGN OPTIONS OF THE INVENTION A preferred design option is that the belt is preferably clamped by means of a wedge in the belt tensioning clamp, around which the end of a belt is guided, preferably as a loop. The tool then is characterized in that it has a tab that engages in the area between the useful section of the belt that goes into the shaft and its short end and exerts pressure on the wedge there to push it through the bottom opening of the clamp in its unclamping direction. The "bottom opening" is the opening through which the belt is guided and which the belt passes while being clamped by the wedge. Overall, a very easy and cost-efficient way of removing the wedged belt can be provided through the tool according to the invention. The tab of the tool can be used to apply force to the wedge aimed at the right spot and therefore makes the application of the force effective and repeatable, compared to a small tool like a screwdriver or something alike. In this way, it can be secured that the belt can be loosened without damage to the belt, not only because the belt also does not have to be cut in the removal process, but also since the tool does not apply detrimental forces to the belt. Another preferred design option is that the tool has an L-shape with a long leg and a short leg, the long leg having a cutout into which said tab extends.