JP2542076Y2 - Suspension type hoist - Google Patents

Description

[Detailed description of the invention] [Industrial applications]

The device of the present invention is used when loading heavy goods that are difficult to lift by hand, loading the goods by hand or unloading the heavy goods.

[Prior art]

As a hoist that lifts heavy objects by hand, a rope is generally wound around a cylindrical winding drum, and a force much larger than the hand's force is applied to the rope (by a leverage or gear-driven booster). Thus, a method of winding up a heavy object is employed. If a worm gear is used as the drive device of the hoist in that case (although the efficiency is low), it is possible to prevent the danger that the winding drum is rotated reversely by the load of the heavy object when the hand is released. However, if a conventional gear device is used, there is a danger that heavy objects will fall if you release your hands.Therefore, for safe operation, it is necessary to provide an automatic brake device or other fall prevention device. Was.

[Problems to be solved by this device]

As described above, the special safety device such as the brake has a risk of an expense for the safety device such that the braking action does not work when the winding operation is not necessary or unnecessary, and a danger of negligence of the driver. The device of the present invention aims to provide an ideal hoisting device that can stably hold a load at a high place without using such a complicated brake device or the like.

[Means for Solving the Problems]

The hoist of the present invention does not use the above-mentioned fall prevention device, and at the two or more pre-planned hoisting heights of the hoist, the automatic stop function which is safe in a released state without using a brake, without using a brake. It was intended to have. Conventional hoisting machines used for unloading heavy objects have a rope that bears the weight and bears the hoisting action. The load of the motor of the hoisting action (hand force in the case of a hand-wound hoist) Was in direct proportion. Therefore, when the driving force is released while the load is being carried, it is naturally impossible to avoid the generation of the reverse rotation force (corresponding to the hoisting force) due to the gravity of the load. The device of the present invention succeeded in achieving the characteristics that cannot be obtained with conventional hoisting machines because the above-mentioned "relationship between load and hoisting force is directly proportional" is eliminated, and hoisting work (hand movement) and hoisting are performed. To completely shut off the direct relationship to the movement of the load
This is due to the development of unconventional and innovative mechanisms. The suspension type hoisting machine according to the present invention is an example, but the shape of a winding drum attached to a bearing provided on a base frame that is swingably supported by a pivot on a ceiling or a high place has a semicircular shape or less. The point is that it has been reduced to malformed. At the point where the center line of the rope wound around the reduced winding cylinder was made to move to the opposite side away from the axis of the bearing that supported the winding cylinder during the winding operation,
There is a feature of the hoist of the present invention. The load acts on the rope wrapped around the winding drum,
When the load is stopped and the rope comes to the position where it is desired to hold, the rope is configured to come to the reduced position of the winding drum. That is, if the rope is located at the position where the winding drum is reduced as described above, the rotational torque for reversing the winding drum due to the load becomes zero or negative, so that even if the hand is released, the load stably stops, The danger of falling is completely prevented. However, if the winding drum does not stop accurately due to the inertia of high-speed rotation as in an electric hoist and there is a risk of breaking through the stable stop position, there is a doubt about the safety. Since is a manual hoist, it can be safely stopped at a predetermined position, and can be used safely without danger. When designing an actual device, you can freely set the position where you want to stop safely, so a safe load can be held at two or more places: a position where the load is raised to a high place and a position where the load is lowered. can do. What is shown in the figure is an example of the present invention. FIG. 1 is a front view of the entire apparatus, and FIG. 2 is a sectional view of a part of the winding drum. Reference numeral 1 in the figure denotes a semicircular winding drum, which is mounted on a fixing frame 2, 2 'mounted on the ceiling by a pin 3, 3' so as to be swingably supported by pins 3, 3 'via a bearing. A lever 6, which is pivotally mounted and has a balance weight 7 for balancing the unbalanced weight of the winding drum, and a chain wheel 8 for driving the winding drum are attached to the support shaft 5 of the winding drum. FIG. 3 illustrates the winding drum. Winding drum main body 1
Is connected to the support shaft 5 by the support plate 1a. FIG. 4 shows a balance lever 6 and a balance weight 7.
Is shown. 5 and 6 show a situation in which the universal hoist of the present invention is used. FIG. 5 shows a situation before the load 10 is wound up, and FIG. 6 shows a situation where the load is held at a high place. As is clear from the figure, since the center line of the rope 9 coincides with the center line of the support shaft 5, the tension of the load 10 does not apply a rotating force to the winding drum, so that the load is released. Even stable.

[Brief description of the drawings]

1 and 2 show an example of the structure of the hoist of the present invention.
FIG. 1 is a front view, and FIG. 2 is a side sectional view. FIG. 3 and FIG. 4 show the attached devices.
The figure shows a winding drum for winding up, and FIG. 4 shows a balance weight. FIG. 5 and FIG. 6 show a situation in which the universal hoist is used for hoisting a load.

【symbol】

1: Roller cylinder, 2, 2 ': Fixing device, 3, 3': Mounting pin, 4: Underframe, 5: Roller support shaft, 7: Balance weight, 8: Chain wheel, 10: Load.

Claims (1)

(57) [Scope of request for utility model registration] 1. A hoist having a rotating shaft provided with a balance weight that balances the weight of the winding cylinder so that the axis of the rotating shaft is located at a position away from the outer shape of the winding cylinder. This is a suspension type hoisting machine that can be secured to a frame supported on a ground, and can safely hold a load at two or more heights without using a reverse rotation prevention device.