JPS583835Y2 - push/pull screw jack - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a push-pull journal jack.

Conventionally, the journal jack as shown in FIG. 1 has been used only for pushing up, but this proposal has been improved to allow it to be used for both pushing and pulling.

To explain the present invention in detail with reference to the drawings, in Figs. 2-3, a ball screw 2 built into the jack main body 1 has a worm wheel 4 fixed through a half-moon key 3 at its lower end tapered part. The main body 1 is supported by the thrust bearings 5 and 6 arranged to sandwich the worm wheel 4.
It is rotatably fixed upright at the bottom of the base 7, and further sealed via several bolts by a base 7 that abuts and supports a thrust bearing 6.

A worm 8 meshing with the worm wheel 4 passes through the main body 1 and is rotatably supported via bushes 9 and 10.

A female threaded cylinder 11 is screwed onto the ball screw 2, and the female threaded cylinder 1 is screwed into the ball screw 2.
1 screws and covers one end of the ram 12, and the other end is the main body 1
Hold it at the upper end.

A key groove 13 is formed on the outer periphery of the ram 12 over its entire length, and its rotation is prevented by a key 14 that is slidably fitted into the key groove 13.

In use, a head 15 or a clevis-shaped head 16 shown in FIG. 4 is screwed onto the upper end of the ram 12.

When the worm 8 is rotated in the direction of the arrow shown in FIG. 3, the worm wheel 4 is rotated in the direction of the arrow. Since 70 rotations are blocked, Ram 1
2 and lift up heavy objects.

This is because the female threaded cylinder 11 is screwed onto the ram 12 by a screw (left-hand thread) in the opposite direction to the ball screw 2.

At this time, the balls enclosed in the female threaded cylinder 11 circulate within the cylinder via the attached clamp 17, as shown in FIG.

By rotating the worm 8 in the opposite direction of the arrow, the ram 12
falls strongly.

With the above-described structure and operation, the present invention provides a journal jack with a thrust bearing 5, a female threaded cylinder 11, and a ram 1.
By simply adding 2, it can be used for both pushing and pulling, and the pulling work can be made more powerful, and while it is possible to perform these tasks, the form can be made compact. This is a push-pull screw jack with the following features.

[Brief explanation of drawings]

Fig. 1 shows a conventional journal jack, Figs. 2 and 3 show a vertical sectional view and a partially cutaway plan view of a push-pull screw jack according to the present invention, and Fig. 4 shows a clevis type used for other purposes. FIG. 5 shows the head, and FIG. 5 shows the ball circulation state. Reference numeral 18 denotes a rotating device having a built-in ratchet, which is also used in the same manner in FIG. vinegar,

Claims (1)

[Scope of utility model registration request] A worm wheel held between bearings is built into the lower space of the main body and sealed with a base, and a worm disposed across the main body is engaged with the worm wheel at its outer periphery, and a ball screw is fitted at the center of the worm wheel. It stands upright and is fixed together with a key, and a female thread cylinder is screwed into the threaded part of the ball screw so as to be able to rise and fall freely, and the lower end of a ram mounted on the ball screw is integrally screwed into the upper end of this female thread cylinder. A push-pull screwdriver characterized in that a key fixed to the upper end of the main body is slidably fitted into a key groove vertically carved on the outer periphery of the ram, and a head is screwed onto the upper end of the ram. .