JP2003155182A - Rack-and-pinion type elevator for construction work - Google Patents

Abstract

PROBLEM TO BE SOLVED: To curb increase in the cost of the driving section with the rack-and- pinion type elevator for construction work growing increasingly larger. SOLUTION: Two output gears 26-1, 26-2 are attached to one driving shaft 18, two pinions 28-1, 28-2 are arranged to engage with a rack 13, the two pinions 28-1, 28-2 and the two output gears 26-1, 26-2 are linked to each other via idle gears 27-1, 27-2, and the two pinions 28-1, 28-2 are driven by the output of the single driving shaft 18, simultaneously and at the same torque.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a construction rack elevator that moves by rotation of a pinion that meshes with a rack.

[0002]

2. Description of the Related Art Rack elevators for construction are used for transportation of materials and personnel in construction work, etc., and an elevator is equipped with an electric motor as a drive unit to drive a pinion that meshes with a vertically installed rack. It has a configuration. The number of electric motors installed in a conventional elevator has reached the maximum limit of four, one for each of the vertical and horizontal sides of the elevator, so there is a need to increase the output of the electric motor to meet the demand for improved carrying capacity. Absent.

However, in that case, the size of the electric motor only increases as the size of the elevator increases, and in order to deal with the increase in the surface pressure of the pinion that meshes with the rack, it is necessary to strengthen each part, which is a structural problem. Involved. Therefore, the increase in the weight of the device due to the increase in size cannot be ignored, and the profit margin is small.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object thereof is to suppress an increase in the cost of a drive unit due to an increase in size of an elevator. Another object of the present invention is to relatively reduce the size of the drive unit as the size of the elevator increases.

[0005]

In order to solve the above-mentioned problems, according to the present invention, two output gears are attached to one drive shaft, and two pinions that mesh with a rack are arranged. The output gears are connected by an idle gear, and the two pinions are simultaneously driven with substantially the same torque by the shaft output of one drive shaft.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The construction rack elevator according to the present invention is of a large size and has a system of moving by rotation of a pinion meshing with a rack. This elevator has two guide pillars on the left and right that are installed on the base of the construction site, and a rack that extends vertically is provided inside the guide pillars so that it can be carried between the left and right guide pillars. An elevator is located as a machine, and the pinion is driven by the rotational driving force of a rotary drive source mounted on the elevator.

The elevator can be composed mainly of a rectangular steel pipe for general structure, has a surface serving as a loading platform for loading materials and a space above it, and has a portion corresponding to the underfloor and a ceiling. It is possible to install a total of four electric motors as a rotary drive source, one on each of the left and right sides at two positions above and below the corresponding portion. An internal combustion engine can be used under conditions where electric power cannot be used, and a fluid pressure motor can be used under conditions where fire is prohibited in addition to electric power.

Two output gears are attached to the drive shaft of such a rotary drive source in order to extract the rotational force. The two output gears are mounted on one drive shaft, but the mounting method is such that the shaft output is distributed to the two output gears with the same torque, and the two output gears rotate at the same speed at the same time. Any method is acceptable as long as the conditions are satisfied. A more preferable method of transmitting power is to provide a buffer mechanism between the drive shaft and the two pinions that mesh with the rack. Two pinions are arranged in a position where they mesh with the rack, and both pinions and two output gears are connected by an idle gear.

By distributing the shaft output of one drive shaft to the two pinions, the surface pressure at the meshing portion of the rack and the pinion becomes ½ under the condition that the gear diameter and the number of teeth are the same, which is reasonable. Power transmission is realized. The torque transmitted to the two pinions may be temporarily different when the shock absorbing mechanism is provided, but when the resistance of the gear that bears the high torque increases due to the shock absorbing mechanism, the gear that bears only the low torque is increased. Is easy to move and acts so as to always balance the torque, so that the torque for driving the two pinions can be considered to be substantially the same.

A pressure receiving roller is provided so that the power transmission by the meshing of the two pinions and the rack is used without waste for the movement of the elevator. The pressure receiving roller is arranged at a position sandwiching the rack with the pinion, and receives the horizontal component force of the meshing surface pressure so that the meshing between the pinion and the rack does not come off.In this case, the elevator side, that is, the drive unit side It is provided in. But,
Other methods are also possible, as long as the engagement between the pinion and the rack can be appropriately maintained. The large size in the elevator of the present invention means an increase in the load capacity of the conventional elevator which is at least 50% or more.

[0011]

The present invention will be described in more detail with reference to the embodiments shown in the drawings. FIG. 1 shows the entire construction of a construction rack elevator according to the present invention. Reference numeral 11 is a foundation, 12 is a left and right guide column body installed thereon, 13 is a rack, and a left and right guide column body. It is attached to the inside of 12, 12. Reference numeral 14 is an elevator, that is, a transporter located between the pillars of the guide. The loading capacity of the elevator 13 is twice as large as that of the conventional type, for example, 2t type instead of 1t type.

The elevator 14 has a loading platform 15 for loading materials, personnel, etc. inside itself, and a structural portion for installing a drive unit 16 at the lower and upper portions thereof. The drive units 16 are provided at a total of four places on the lower left and right sides and on the upper side. Each drive unit 16 is provided with one motor, that is, an electric motor 17, as a rotary drive source. See FIG.

The electric motor 17 constituting the drive unit 16 is a so-called geared motor. It is assumed that the electric motor 17 has a shaft output that is about twice that of a motor used in a conventional construction rack elevator. The output shaft of the electric motor 17 has a center shaft 18 as a drive shaft for coupling 1.
9 and the output shaft is extended. The center shaft 18 is provided with a connecting means 20 serving as a coupling for torque balance, by which power transmission via a buffer mechanism is performed. Reference numeral 21 indicates a bearing.

The connecting means 20 has a disk-shaped portion 22 provided on the center shaft 18 and a pin portion 23 which is passed through a flange portion thereof and which is parallel to the center shaft 18.
Is the knock pin 24 on the center shaft 18, and the pin portion 2
3 is fixed to the flange portion with a key 25. See FIG. 3 and FIG. A plurality of pin portions 23 are provided at regular intervals around the center shaft 18 at regular intervals, and both ends of the pin portions 23 are two front and rear output gears 2 attached to the center shaft 18.
The two output gears 26-1 and 26-2 can be rotated by the rotation of the center shaft 18 by being connected to 6-1 and 26-2. One idle gear 27-1 and 27-2 is meshed with each output gear 26-1 and 26-2,
Further, the idle gears 27-1 and 27-2 are the rack 1
3 are connected to the pinions 28-1 and 28-2 that mesh with the pinion 3. Reference numeral 29 indicates a bearing of the gear shaft 30 to which each gear is attached.

The rack 13 has one tooth, and the side opposite to the tooth is a linear guide portion 31 on which the pressure receiving rollers 32-1 and 32-2 can roll. The pressure receiving rollers 32-1 and 32-2 are pinions 28-1 and 28-2.
It is arranged at a position sandwiching the rack between and, and is pivotally supported on the elevator side. Since the two pinions 28-1 and 28-2 are arranged in parallel with the drive shaft (18) sandwiched therebetween and engage with the rack 13 having one tooth, the rack 13 having the same structure as the conventional rack is used. It can be used, and power transmission efficiency can be doubled. The pressure receiving rollers 32-1 and 32-2 are eccentric to the rack 1.
This is for adjusting the meshing of the three pinions 28-1 and 28-2.

A plurality of side rollers 33 are attached around the driving part of the elevator 14. The side rollers 33 guide the front and rear parts of the guide pillar 12 to the guide rails 34.
As a result, the elevator 14 rolls due to the movement of the elevator 14 to keep the elevator 14 vertically moving. A speed switch pinion 35 is provided to detect the descending speed of the elevator 14 and turn the power circuit on and off.

In the present invention having such a structure, the operation control panel mounted inside or outside the elevator is operated (not shown), and when the electric motor 17 starts to operate, the center shaft 18 is moved from the coupling 19 to the center shaft 18. After that, power is transmitted to the connecting means 20 and is divided into two by the front and rear output gears 26-1 and 26-2, and then reaches the pinion 28-1 and 28-2 through the idle gears 27-1 and 27-2. , The rack 14 rotates while meshing with the rack 13, so that the elevator 14 starts rising. Two
Power transmission to the output gears 26-1 and 26-2 is performed through the connecting means 20, so that the two pinions 28-
1, 28-2 are simultaneously driven with substantially the same torque, and power transmission by the optimum surface pressure at the meshing portion between the pinions 28-1, 28-2 and the rack 13 is realized.

[0018]

EFFECTS OF THE INVENTION Since the present invention is constructed and operates as described above, under the condition that the elevator becomes large and the output of the drive unit needs to be increased, two shaft outputs of one drive unit are required. Since the pinion can be driven at almost the same torque at the same time, it is possible to minimize the size increase of the electric motor and the like and suppress the cost increase.
Further, if the loading capacity is the same, it is possible to allocate a smaller drive unit, so that the cost can be saved, or the elevator can be made smaller.

[Brief description of drawings]

FIG. 1 (a) is a front view showing an embodiment of a construction rack elevator according to the present invention. (B) The side view same as the above.

FIG. 2 is an enlarged side view of a main part of the same.

FIG. 3 is an explanatory plan view showing an example of a drive unit.

FIG. 4 is an explanatory view of a power transmission terminal portion.

[Explanation of symbols]

13 racks 14 Elevator 16 Drive 17 Electric motor 18 center axis 20 Connection means 26-1, 26-2 Output gear 27-1, 27-2 idle gear 28-1, 28-2 Pinion 32-1 and 32-2 pressure receiving roller

Claims (3)

[Claims] 1. A construction rack elevator that moves by rotation of a pinion that meshes with a rack, wherein two output gears are attached to one drive shaft, and two pinions that mesh with the rack are arranged. And a pair of output gears are connected by an idle gear, and two pinions are simultaneously driven with substantially the same torque by the shaft output of one drive shaft. 2. The drive shaft is provided with a connecting means, and the connecting means has a disk-shaped portion provided on the center shaft and a pin portion which is passed through a flange portion of the drive shaft and is parallel to the center shaft. The construction rack elevator according to claim 1. 3. The construction rack type according to claim 1 or 2, wherein the rack has one tooth, and the side opposite to the tooth is a linear guide portion, and the pressure receiving roller can roll there. Elevator.