JPH0716697Y2 - Elevator fall prevention device at construction site - Google Patents

Description

[Detailed Description of the Invention] [Object of the Invention] Industrial field of application The present invention relates to a fall prevention device for an elevator at a construction site, which is designed to ensure the safety of an elevator installed together with a scaffold at a construction site. .

2. Description of the Related Art Conventionally, in an elevator at a construction site or the like, a vertical rack is engaged with a pinion connected to a geared motor, and rack and pinion teeth are chipped,
A fall prevention device is installed in consideration of an unexpected situation where the gondola falls due to other reasons, and such a fall prevention device does not operate when the gondola is normally lowered, but it acts in an emergency when the fall speed is fast, As one example thereof, in the one shown in FIG. 4, a pinion b is meshed with a rack a, and pendulums e and e are attached to the shaft ends of support shafts d and d'which are slantably attached to its driving shaft c. ′ Is provided, and the pendulums e and e ′ are moved up and down by the centrifugal force due to the high speed rotation, and the driven shaft f is moved up and down via the support shafts d and d ′. It has been devised to engage the stopper claws i, i'with the racks a, a'via the mechanism. However, since such a mechanism is mechanical and is composed of a large number of members, the interlocking property is poor, and the instant It does not operate and is considered as a safety device (fall prevention device). Degree is low, also mechanisms had the disadvantage that gets in the way in greater becomes narrow gondola.

The problem to be solved by the invention The present invention operates instantly in an emergency when the gondola falls,
It is intended to provide a fall prevention device for an elevator at a construction site in which the gondola is surely prevented from falling to ensure safety, and the mechanism is simply reduced in size.

[Constitution of device]

Means for Solving the Problems The present invention is based on the above-mentioned conventional technology, and in view of the problem that the interlocking performance is poor and does not operate instantly, and the mechanism is large, the disk is fixed to the rotating shaft of the pinion that meshes with the rack, The shaft and the driven shaft are connected via a centrifugal clutch, and a feed screw type conversion body that converts the rotational force of the driven shaft into the sliding force of the piston shaft is provided, and the piston with the piston shaft fixed is mounted in the cylinder. , Wind the spring around the piston shaft,
By installing a brake pad that is activated by the hydraulic pressure of the cylinder on the disc, it can be activated instantly in an emergency to stop the fall of the gondola to improve safety and use hydraulic pressure to reduce the transmission path and simplify the mechanism. By doing so, the above problem is solved.

Effect The present invention is designed so that the centrifugal clutch is not engaged when the gondola is descending during normal operation and the brake mechanism does not operate. The rotational force of the converter slides by the converter, and at this time, the piston shaft slides by the action of the spring, the piston slides in the cylinder to apply pressure to the transmission oil, and the brake pad operates via the hydraulic circuit. Then, the disk of the rotating shaft is braked and the descent of the gondola is stopped.

Embodiment An embodiment of the present invention will be described below with reference to the drawings. 1 is an elevator fall prevention device installed at an appropriate position on a scaffold at a construction site, and the fall prevention device 1 is a guide rail (not shown). Along with the drive device 2 in a gondola (not shown) that moves up and down along the vertical direction.

Reference numeral 3 denotes a vertical rack attached to a guide rail of an elevator, and a pinion 5 connected to a geared motor 4 of a drive unit 2 is meshed with the rack 3.

6 is a pinion of the fall prevention device 1, the pinion 6 meshes with the rack 3 and fixes the rotary shaft 7 at the center,
A disk-shaped disk 8 is attached to the intermediate portion of the rotary shaft 7, and a large gear 9 is fixed to the tip portion.

Reference numeral 10 is a centrifugal clutch, and a small gear 12 meshing with a large gear 9 is fixed to the base end of a driving shaft 11 on the input side, and a disc-shaped base plate 13 is fixed to the clutch portion (tip portion). .. are connected to the base plate 13 via links 14, 14a .., and springs 16, 16a ..
Is pulled inward.

Reference numeral 17 denotes a driven shaft on the output side. The driven plate 18 is fixed to the clutch portion (base end) of the driven shaft 17, and the driven plate 18
A flange 19 corresponding to the substrate 13 is provided in a protruding manner on the outer peripheral edge portion of the, and the tip end portion of the driven shaft 17 is a screw portion 20.

Reference numeral 21 denotes a cylindrical feed screw type conversion body which is non-rotatable and slidable in the axial direction, and a threaded portion 22 which is screwed with the threaded portion 20 of the driven shaft 17 is provided at the base end of the conversion body 21. , The converter 21 is slid to the left (the tip direction) by the rotation of the driven shaft 17, and the piston shaft 23 is inserted into the tip of the converter 21.
A contact plate 25 is fixed to the base end of the piston shaft 23 so as to correspond to the inner surface of the tip wall 24 of the converter 21.

Reference numeral 26 denotes a cylinder. A piston 27, to which a piston shaft 23 is fixed, is slidably mounted in the cylinder 26, transmission oil is filled in a pressure chamber 28, and an intermediate portion of the piston shaft 23 is provided. The piston shaft 23 to the tip side (cylinder
A spring 29 is wound so as to press it toward the (26 side).

Numerals 30 and 30a are brake pads for sandwiching and braking the rotation of the disk 8. The brake pads 30 and 30a are hydraulically actuated to transmit the hydraulic pressure of the cylinder 26 through a transmission pipe 31 for braking.

Next, the operation of the elevator fall prevention device at the construction site according to the present invention will be described. The pinion 6 is used when the gondola is normally lowered (normally 10 m).
Rotates at 40 rpm, for example, and at this time, the bells 15, 15a ... Are pulled inward by the springs 16, 16a ... In the centrifugal clutch 10, so that they do not contact the inner surface of the flange 19 and the centrifugal clutch 10 is not connected. If the brake mechanism does not work and the gondola falls, the pinion 6 is 100r, for example.
It rotates at pm and is tripled by the large gear 9 and the small gear 12, and at this time, the bells 15, 15a in the centrifugal clutch 10 ...
Is a flange 1 by centrifugal force against the springs 16 and 16a ....
9 is contacted with the inner surface of the centrifugal clutch 10 and the driven shaft 17
Is rotated, and the screw portion 20 of the driven shaft 17 and the screw portion 22 of the conversion body 21 are screwed together, whereby the rotational force is converted into a sliding force and the conversion body 21 slides to the left side (direction of the cylinder 26). At this time, due to the action of the spring 29, the piston shaft 23 slides to the left side (direction of the cylinder 26), the piston 27 slides in the cylinder 26 to apply pressure to the transmission oil, and through the hydraulic circuit (transmission pipe 31). Brake pads 30, 30a actuate to brake the disk 8 of the rotary shaft 7,
It stops the fall of the gondola.

[Effect of device]

In short, according to the present invention, the disk 8 is fixed to the rotating shaft 7 of the pinion 6 that meshes with the rack 3, the rotating shaft 7 and the driven shaft 17 are connected via the centrifugal clutch 10, and the rotational force of the driven shaft 17 is transferred to the piston shaft 23. Feed screw type conversion body 21 that converts into sliding force
The piston 27 with the piston shaft 23 fixed in the cylinder 26 is installed, and the spring 29 is attached to the piston shaft.
Since the brake pads 30 and 30a wound around 23 and operated by the hydraulic pressure of the cylinder 26 are attached to the disc 8, the centrifugal clutch 10 is disengaged and the brake does not work because the rotation is slow during normal operation. Fall prevention device 1
The energy load can be minimized only by the rotational movement of the centrifugal clutch 10 front side.

In an emergency, the centrifugal clutch 10 is connected and the brake mechanism operates to stop the fall of the gondola, which is safe. In addition, the centrifugal clutch 10 is used to select between normal and emergency conditions, so the operation is instantaneous. It is possible to improve safety and the transmission is instantaneous because the hydraulic circuit is used,
The mechanism can be easily reduced in size, and since it is a hydraulic circuit and the piston 27 (piston shaft 23) is pushed by the spring 29, there is no play and the movement direction is the same direction as the slide operation The feed screw type conversion body 21, which can be secured and can be operated instantly, and which converts rotary motion to slide motion, is structurally directly connected and integrated, thus ensuring followability and increasing hydraulic pressure. It can be done reliably, and its practical effects are enormous.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention. FIG. 1 is a mechanism diagram of a fall prevention device according to the present invention, FIGS. 2 and 3 are sectional views of a centrifugal clutch, and FIG. It is a mechanism diagram of a prevention device. 3 ... Rack, 6 ... Pinion, 7 ... Rotating shaft 8 ... Disk, 10 ... Centrifugal clutch, 17 ... Driven shaft 21 ... Converter, 23 ... Piston shaft, 26 ... Cylinder 27 ... Piston, 29 …… Spring 30, 30a …… Brake pad

Claims (1)

[Scope of utility model registration request] 1. A feed screw type in which a disc is fixed to a rotating shaft of a pinion that meshes with a rack, the rotating shaft and a driven shaft are connected via a centrifugal clutch, and the rotating force of the driven shaft is converted into a sliding force of a piston shaft. The construction site is characterized in that a piston with a fixed piston shaft is mounted in the cylinder, a spring is wound around the piston shaft, and a brake pad that is operated by the hydraulic pressure of the cylinder is mounted on the disc. Elevator fall prevention device.