WO2006115386A1

WO2006115386A1 - Brake apparatus for the elebator

Info

Publication number: WO2006115386A1
Application number: PCT/KR2006/001594
Authority: WO
Inventors: Jong Soon Kim
Original assignee: Ls-Tech Co., Ltd.
Priority date: 2005-04-28
Filing date: 2006-04-28
Publication date: 2006-11-02
Also published as: KR100539590B1; CN1942383A

Abstract

Disclosed herein is a brake apparatus for elevators, which simplifies the construction of a gear assembly for operating a hydraulic generator, and ensures stability. The brake apparatus includes an outer drum mounted to the elevator. An inner drum is rotatably supported in the outer drum. A pinion is supported via a shaft to the inner drum in such a way as to engage with the rack and extends a fly weight when the elevator falls, thus rotating the inner drum. A drive gear is integrally provided on the outer circumferential surface of the inner drum and engages with a driven gear of a hydraulic generator. A hydraulic cylinder is coupled to the hydraulic generator and generates braking force in a predetermined direction such that the elevator is not forced away from the rail.

Description

BRAKE APPARATUS FOR THE ELEBATOR

Technical Field

[1] The present invention relates, in general, to a brake apparatus for elevators and, more particularly, to a brake apparatus for elevators, in which a brake pad is installed between inner and outer drums to generate braking force, and a drive gear is integrally mounted to the outer circumferential surface of the front end of the inner drum to engage with a driven gear of a hydraulic generator, thus simplifying the construction of a gear assembly for operating the hydraulic generator, and preventing an elevator from shaking when a hydraulic cylinder is operated, therefore ensuring stability. Background Art

[2] Generally, an elevator used in a construction site is constructed to move along vertical rails, thus carrying passengers and loads. The elevator is provided with a drive pinion operated by a drive motor, and a rack is vertically installed to engage with the drive pinion, thus operating the elevator. Further, a governor is installed to prevent the falling of the elevator.

[3] The governor is a kind of brake apparatus. When the elevator falls, the governor rotates at a high speed, and a fly weight installed in the governor is extended, thus braking the elevator. However, when the braking force of the governor is too large, the elevator is stopped abruptly, so that passengers may be injured. Conversely, when the braking force of the governor is weak, there is a risk of uncontrolled falling. Further, the elevator may not be braked due to the failure of the governor. Thus, there is a pressing need for a backup safety device. Disclosure of Invention Technical Problem

[4] Accordingly, in order to solve the problems, the inventor invented a brake apparatus for braking an elevator using hydraulic pressure, which is disclosed in Korean Patent No. 354380. Further, the brake apparatus was improved and registered as Korean U.M. Registration No. 243892. According to the Patent No. 354380, when the elevator falls, braking force is generated through a clutch rotating at high speeds and a hydraulic generator connected to the clutch. According to the U.M. No. 243892, while a clutch rotates at high speeds, frictional force is additionally generated by the operation of a hydraulic generator.

[5] The present invention improves the Korean U.M. No. 243892, and an object of the present invention provides a brake apparatus for elevators, in which an inner drum engages with a brake pad of an outer drum while the inner drum rotates at high speeds, thus generating braking force, and a drive gear connected to a hydraulic generator is provided on the outer circumferential surface of the front end of the inner drum, thus allowing an elevator to be braked by hydraulic pressure, therefore simplifying the construction of a gear assembly for operating the hydraulic generator, and in which the operating direction of a hydraulic cylinder connected to the hydraulic generator is parallel to the elevator, thus preventing the elevator from shaking while the elevator is braked by hydraulic pressure, therefore ensuring stability. Technical Solution

[6] In order to accomplish the object, the present invention provides a brake apparatus for preventing the falling of an elevator which moves up and down along a rail and a rack, including an outer drum mounted to the elevator, an inner drum rotatably supported in the outer drum, a pinion supported via a shaft to the inner drum in such a way as to engage with the rack and extending a fly weight when the elevator falls, thus rotating the inner drum, a drive gear integrally provided on the outer circumferential surface of the inner drum and engaging with a driven gear of a hydraulic generator, and a hydraulic cylinder coupled to the hydraulic generator and generating a braking force in a predetermined direction such that the elevator is not forced away from the rail.

Advantageous Effects

[7] As described above, a braking force is generated between inner and outer drums, and a drive gear for operating a hydraulic generator is integrally provided on the outer circumferential surface of the inner drum, so that a component, such as a spline shaft, a gear casing, or a bearing, is not required unlike the prior art, thus reducing a manufacturing cost, and improving assemblability, therefore increasing productivity.

[8] Especially, according to the present invention, the operating direction of a hydraulic cylinder connected to a hydraulic generator is parallel to an elevator, so that the elevator is not forced away from rails, thus preventing the elevator from shaking and ensuring stability. Brief Description of the Drawings

[9] Fig. 1 is a front view of an elevator equipped with a brake apparatus, according to the present invention;

[10] Fig. 2 is a plan view of the elevator equipped with the brake apparatus, according to the present invention;

[11] Fig. 3 is an exploded perspective view showing the brake apparatus, according to the present invention;

[12] Fig. 4 is a perspective view showing the assembled state of the brake apparatus, according to the present invention;

[13] Fig. 5 is a front sectional view showing the brake apparatus, according to the present invention; and

[14] Fig. 6 is a sectional view showing part of the brake apparatus, according to the present invention. Best Mode for Carrying Out the Invention

[15] Fig. 1 is a front view of an elevator equipped with a brake apparatus, according to the present invention, Fig. 2 is a plan view of the elevator equipped with the brake apparatus, according to the present invention, and Fig. 3 is an exploded perspective view showing the brake apparatus, according to the present invention. According to the present invention, an elevator 3 is provided with drive pinions 5 engaging with a vertical rack 2 so that the elevator 3 moves up and down along vertical rails 1, and reduction motors 4 rotating the drive pinions 5. Thereby, the elevator 3 is moved by electromotive force.

[16] In order to prevent the elevator from falling, a governor 6 operated by a centrifugal force is provided. The brake apparatus of the present invention is additionally mounted to the upper portion of the elevator.

[17] Fig. 3 is an exploded perspective view showing the brake apparatus, according to the present invention. The inner and outer drums 8 and 7 overlap each other while tapered inclined surfaces are laid between the inner and outer drums 8 and 7. The outer drum 7 is mounted to the upper surface of the elevator 3 via a bracket 23. A brake pad 9 is mounted to the inclined surfaces of the drums 8 and 7, and generates a braking force while the inner drum 8 coming into close contact with the outer drum 7.

[18] A bolt part 18 is provided on the rear end of the inner drum 8 and engages with a nut part 19. Protrusions 20 provided on the outer circumference of the nut part 19 are fitted into grooves 21 formed on the inner circumference of the rear end of the outer drum 7. Further, the nut part 19 is biased by a spring 22 installed in the outer drum 7, so that the inner drum 8 moves to be in close contact with the brake pad 9.

[19] A pinion shaft 15 of a pinion 14 engaging with the rack 2 is inserted into the inner drum 8 to be supported by the inner drum 8. A plurality of locking steps 13 is provided on the inner circumference of the inner drum 8 to surround the pinion shaft 15. Further, a balance weight 16 and a fly weight 17 are provided on the pinion shaft 15. When the pinion shaft 15 rotates at high speeds due to the falling of the elevator, the fly weight 17 is extended and locked to the locking step 13, thus rotating the inner drum 8.

[20] As the inner drum 8 rotates, the bolt part 18 rotates. Meanwhile, the nut part 19 does not rotate but moves along the thread of the bolt part 18, because the protrusions 20 of the nut part 19 are locked to the grooves 21. At this time, the spring 22 is compressed. Consequently, the inner drum 8 is brought into close contact with the outer drum 7, and a braking force is generated by the brake pad 9 provided between the tapered surfaces of the inner and outer drums.

[21] As shown in Fig. 5, a drive gear 10 of the present invention is integrally provided on the outer circumferential surface of the front end of the inner drum 8. Further, a hydraulic generator 11, having a driven gear 12 engaging with the drive gear 10, is provided on the outer surface of the outer drum 7. Hydraulic cylinders 24, connected to the hydraulic generator 11 via a hydraulic line 26, are provided on the upper portion of the elevator 3.

[22] Each hydraulic cylinder 24 is arranged such that the operating direction thereof is parallel to the elevator 3. When a brake pad 25 of the hydraulic cylinder approaches each rail 1, so hydraulic pressure is generated, a braking force is generated between the hydraulic cylinder and the rail 1. Further, a pressure maintaining valve 27 is provided on the hydraulic line 26, thus preventing pressure exceeding a predetermined pressure level (120Kg/cm ) from acting on the hydraulic line, therefore ensuring safety.

[23] The present invention constructed as described above is characterized in that the construction of the brake apparatus is simple. Since the drive gear 10 engaging with the driven gear 12 of the hydraulic generator 11 is provided on the outer circumferential surface of the front end of the inner drum 8, an additional drive gear is not required.

[24] According to the prior art, for example, Korean U.M. No. 243892, a spline shaft is required to install a drive gear to the rear portion of the outer drum 7, and besides, a casing surrounding the spline shaft and a bearing rotatably supporting the drive gear are required, so that a manufacturing cost is increased and assemblability is poor. However, according to the present invention, the drive gear 10 is integrally provided on the outer circumference of the front end of the inner drum 8, so that the spline shaft, the gear casing, and the bearing are not required, and thus productivity is dramatically improved.

[25] The operation of the present invention is as follows.

[26] When the elevator 3 falls, the pinion 14 engaging with the rack 2 moves downwards and rotates at high speeds. At this time, the fly weight 17 connected to the pinion shaft 15 is extended and is locked to the locking step 13. Thereby, the inner drum 8 is rotated, and the nut part 19 engaging with the bolt part 18 of the inner drum 8 is pulled and the spring 22 is compressed, and thus the inner drum 8 moves toward the outer drum 7. At this time, the brake pad 9 is compressed, thus generating braking force. Such operation does not affect the engagement of the drive gear 10 and the driven gear 12, because the moving distance of the inner drum 8 is about 3mm or less.

[27] When the inner drum 8 rotates, the drive gear 10 integrated with the inner drum 8 rotates naturally. At this time, the driven gear 12 rotates and hydraulic pressure is generated in the hydraulic generator 11. The generated hydraulic pressure is transmitted through the hydraulic line 26 to each of the hydraulic cylinders 24. Thus, the brake pad 25 of each hydraulic cylinder is brought into close contact with the rail 1, so that braking force is generated.

[28] According to the present invention, braking operation is doubly carried out by the brake pad 9 between the drums 8 and 7 and the brake pad 25 of each rail 1, so that the safety of the elevator is ensured. Further, since the operating direction of each hydraulic cylinder 24 is parallel to the elevator, the hydraulic cylinder does not push the elevator away from the rails 1, thus preventing the elevator from shaking. The pressure maintaining valve 27 is mounted on the hydraulic line, thus preventing high pressure from acting on the hydraulic line, therefore preventing the rails from being buckled.

Claims

[1] A brake apparatus for elevators, having an outer drum (7) mounted to an elevator which moves up and down along a rail (1) and a rack (2), an inner drum (8) rotatably supported in the outer drum (7), a brake pad (9) provided on tapered inclined surfaces of the inner and outer drums (8)(7), a pinion (14) supported via a shaft to the inner drum (8) in such a way as to engage with the rack (2) and extending a fly weight (17) when the elevator falls, thus rotating the inner drum (8), and a spring (22) provided in the outer drum (7) and compressed by a bolt part (18) and a nut part (19) when the inner drum (8) rotates, thus providing braking force to the brake pad (9), the brake apparatus comprising: a drive gear (10) integrally provided on an outer circumferential surface of the inner drum (8) to engage with a driven gear (12) of a hydraulic generator (11); and a hydraulic cylinder (24) connected to the hydraulic generator (11), and generating hydraulic braking force in a predetermined direction such that the elevator (3) is not forced away from the rail (1).