JPH0136877Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention is a screw-type jacking device for raising and lowering heavy objects, and its operation can be freely switched between manual drive and drive using a power source such as a motor. Pertains to devices made available for use.

(Prior Art) Screw-type jacking devices are generally well known, but the conventional models are divided into manual and power-type jacking devices, and there is no one that allows these types to be easily switched and used in one machine.

(Problem to be solved by the invention) The above-mentioned conventional type is divided into manual type and power type, so when the lifting amount is large, the manual type requires a lot of labor, and the power type type requires a lot of labor. Each model had its advantages and disadvantages, such as difficulty in making fine adjustments.

(Means for Solving the Problems) The present invention eliminates the inconveniences in use of the conventional jacking device, and enables one type of jacking device to be switched to manual or power drive at any time. , a screw-type jacking device consisting of a worm, a worm wheel that meshes with the worm, and an elevating rod that is screwed into the worm wheel and moves up and down as the wheel rotates, in which rotation is transmitted to a driven gear fixed to the lower end of the worm shaft. At the same time, a sprocket driven by a chain is loosely fitted to the upper end of the worm shaft, and the engagement between the manual gear and the driving gear is achieved by the vertical movement of a switching lever that is provided in the housing of the jacking device so as to be able to move up and down. When the sprocket is disengaged, the worm shaft and sprocket are engaged and disengaged by a clutch.

(Example) Embodiments of the present invention will be described with reference to the drawings.

In the drawings, reference numeral 1 designates a casing of the jacking device, in which a worm 2, a worm wheel 3 that engages with the worm 2, and an elevating rod 4 that are screwed into the worm wheel 3 and are moved up and down by the rotation of the wheel are provided. Although the elevating rod 4 can be moved up and down by a sliding key 5, it is not rotatable, and the shaft 6 of the worm 2 is inserted vertically through the casing 1.

A driven gear 7 is fixed to the lower end of the worm shaft 6, and a manual gear 8 is provided in circumferential contact with the driven gear 7 and has teeth that mesh with the gear 7 on its inner peripheral surface. 7, the worm shaft 6 is rotated to perform manual jacking operation.

A sprocket 10 is freely rotatably attached to the upper end of the worm shaft 6, and a chain 11 is connected to the sprocket 10 so that the sprocket 10 is rotated by a power source such as a motor.

Further, a movable clutch wheel 12 is mounted on the upper end of the worm shaft 6 so as to be movable up and down and rotate integrally with the worm shaft 6 by a sliding key 13, so that the sprocket 10 and the movable clutch wheel 12 are opposed to each other. A clutch mechanism is formed on the surface by concavities and convexities 14 that engage and disengage each other.

The switching operating rod 16 is provided so as to be able to be raised to two levels, upper and lower, by inserting the housing 1 vertically, and two grooves 17 are provided in the operating rod 16 corresponding to the vertical movement positions. Ball 1 fired by a spring from the 1st side
8 is engaged with any of the grooves 17 to restrict stopping at the upper and lower elevation positions. The lower end of the switching rod 16 is connected to the manual gear 8 described above.
The manual gear 8 can be moved up and down as a unit by raising and lowering the operating rod 16 using an operating knob 19 formed at the lower protruding end thereof.
The manual gear 8 is engaged with and disengaged from the driven gear 7 by its vertical movement.

The center of the switching lever 16 is inserted through so that it also serves as a rotating shaft for the manual gear 8. Furthermore, although the manual gear 8 in the illustrated example uses an internal gear to reduce the space occupied by the operating mechanism, there is no problem in operation even if the manual gear 8 is an external gear. Switching rod 16
By engaging the lever 20 projecting laterally from the upper end with the movable clutch wheel 12, the clutch mechanism formed between the movable clutch 12 and the sprocket 10 is engaged and disengaged by vertical movement of the operating shaft 16. I did it like that.

(Function) When performing the jacking operation manually in the above device, when the manual gear 8 is rotated by the grip piece 9, the worm shaft 6 is rotated by the rotation of the driven gear 7 that meshes with the manual gear 8, and the worm shaft 6 is accordingly rotated. 2 and a worm wheel 3 to transmit vertical movement to the lifting rod 4. In this case, when the lever 20 at the upper end of the switching shaft 16 is in the upward movement position, the movable clutch 1
The movable clutch 12 rotates together with the worm shaft 6 in order to separate the sprocket 10 from the sprocket 10 and open the clutch mechanism using the unevenness 14, but it is unrelated to the power side, and even if the sprocket 10 is being rotated by the power source, it cannot be manually operated. It does not interfere with the jacking operation due to operation.

When the switching lever 16 is pulled down using the operating knob 19 from the above manual operation, the manual gear 8 moves downward and is disengaged from the driven gear 7, and at the same time the lever 20 at the upper end of the operating lever 12 The chain 1, which is driven by a power source, moves the movable clutch wheel 12 downward to close the clutch mechanism formed by the concave and convex portions 14.
1 rotates the movable clutch wheel 12 via the clutch mechanism,
Therefore, the worm shaft 6 is rotated by the engagement of the key 13, and the jacking operation is performed using power, and at this time, as described above, due to the disengagement of the manual gear 8 and the driven gear 7, the operation is completely unrelated to the manual jacking operation. becomes.

In this way, according to the present device, the switching actuation rod 1
By the switching operation of vertical movement 6, switching between manual operation and jacking operation by the power source can be performed smoothly and easily at any time.

In addition, when the manual gear 8 is an internal gear, the driven gear 7
The number of teeth is larger and therefore an accelerated manual operation is obtained compared to direct drive of the worm shaft 6.

(Effects of the invention) According to the invention, a manual gear that moves up and down and a driven gear that engages and disengages are fixed to the lower end of the worm shaft in a screw type jacking device, and the upper end of the worm shaft is powered by the up and down movement. A clutch mechanism that engages and disengages from the side is provided, and the engagement and disengagement is performed by the vertical movement of the switching lever, so that when either manual operation or power operation is operated, the other is unrelated. Switching between the two types of use is extremely accurate, and each type of operation can be used effectively, resulting in the effect that one model can be used for both manual and powered operations.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, with FIG. 1 being a cut-away plan view and FIG. 2 being a cut-away side view. 1... Housing, 2... Worm, 3... Worm wheel, 4... Lifting rod, 6... Worm shaft, 7
... Driven gear, 8 ... Manual gear, 14 ... Clutch mechanism, 16 ... Switching operation rod.

Claims (1)

[Scope of utility model registration request] A screw type jacking device consisting of a worm, a worm wheel that meshes with the worm, and a lifting rod that is screwed into the worm wheel and moves up and down as the wheel rotates, which transmits rotation to a driven gear fixed to the lower end of the worm shaft. A manual gear is provided, and a sprocket rotated by a chain is loosely fitted to the upper end of the worm shaft, and the engagement between the manual gear and the drive gear is achieved by the vertical movement of a switching lever mounted on the housing of the jacking device so as to be able to move up and down. A screw-type jacking device in which a worm shaft and a sprocket are engaged and disengaged by a clutch at the same time as disengagement.