Spring compression device

Abstract

The invention provides a spring compression device, wherein the compression of a spiral spring can be realized in a narrow work space. The spring compression device used during the compression of a helical spring (15) is inserted in a guide rod (2) equipped with a hexagon head (3). One end of the device is arranged on the guide rod (2) by abutting against the spring seat (27) of the head (3) so as to form a lifting-up nut (5) and a lifting-up pipe (14). The outer circumferential surface of the lifting-up nut is equipped with an external thread part (1) and the central portion thereof is equipped with a through part (4). The through part (4) is equipped with an insertion part (4A) for the insertion of the shaft portion of the guide rod and a cooperation part (4B) surrounding the insertion part. The inner circumferential surface of the lifting-up pipe is equipped with an internal thread part (11) matched with the external thread part of the lifting-up nut and the end portion thereof can abut against the spring seat inserted in the guide rod.

Description

technical field [0001] The present invention relates to a spring compression device used when compressing a coil spring mounted on a guide rod. Background technique [0002] For example, a belt tension holding mechanism provided in a door opening and closing device of an elevator includes a coil spring that applies tension to a belt that transmits rotation of a motor as a door opening and closing operation. The coil spring is inserted into the guide rod having a polygonal head and is attached to the guide rod so that one end thereof abuts against a spring seat disposed on the head side. When replacing a belt that has deteriorated due to long-term use, disassemble and adjust the belt tension holding mechanism. However, in order to remove the belt during such disassembly and adjustment operations, it is necessary to reduce the tension of the belt. At this time, the operation of compressing the coil spring is performed. [0003] However, in the past, as a spring compression de...

AI Technical Summary

Problems solved by technology

[0008] In the prior art shown in the above-mentioned patent documents 1 to 3, when the size between the wires of the coil spring is small, the front end of the bracket cannot be inserted between the wires of the coil spring, and the compression of the coil spring cannot be achieved.

In addition, when the working space around the side of the coil spring is narrow, the bracket cannot be arranged, and in this case, the compression of the coil spring cannot be realized.

[0009] For example, the coil spring equipped in the belt tension holding mechanism of the above-mentioned elevator door opening and closing device is difficult to adopt due to the small size between the spring wires and the narrow working space around the sides of the coil spring. The prior art shown in the above-mentioned Patent Documents 1 to 3

[0010] Moreover, when disassembling and adjusting the belt tension holding mechanism of the door opening and closing device of the elevator, one operator maintains the state while compressing the coil spring using a predetermined tool plus his own body weight, and the other operator lowers the tension. After removing the belt, etc., that is, when disassembling and adjusting the belt tension holding mechanism of the door opening and closing device of the elevator, two operators are required.

Therefore, the maintenance cost of the disassembly and adjustment of the belt tension holding mechanism is high.

Images