JPS5932501Y2 - Nut tightening device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a tightening device that can be used when tightening a large nut, particularly when the object to be screwed is a rotatable cylindrical body.

For example, when screwing a large nut into a large cylindrical body such as a roll sleeve and tightening it, conventionally the nut is engaged with a fixed sleeve and rotated using a jig or crowbar. Tightening was done manually.

However, due to the large size of the nut, the work itself becomes labor intensive and efficiency decreases.The purpose of the present invention is to eliminate these conventional inconveniences, and to develop an efficient method for tightening large nuts. The objective is to provide a means of attachment.

The tightening device of the present invention consists of a holding device 1 for mounting and rotating a threaded object (hereinafter referred to as a sleeve) a having a collar at one end and a threaded portion at the other end, and a nut receiver for holding a nut b. The nut fixing device 3 is comprised of a stand device 2 and a nut fixing device 3 that is combined with the nut holder device 2 to move the nut b in the tightening direction.

As shown in FIG. 1, the main structure of the sleeve holding device 1 is that a horizontally arranged rotating shaft 11 is rotatably held at a predetermined height by a housing 12. A mounting portion 13 into which the sleeve a can be tightly fitted is integrally formed on the protruding side of one end, and a motor 15 is connected to the other end with a friction clutch 14 interposed therebetween.

Therefore, rotation of the rotating shaft 11 is transmitted at a slow speed or at a stop depending on the degree of load applied to the mounting portion by the action of the friction clutch 140.

The nut pedestal device 2 is fixedly provided at a position corresponding to the tip of the mounting portion 13, and has a V-shaped receiving surface suitable for placing the oak on the upright tower as shown in Fig. 2. The height of the pedestal 21 can be adjusted by manual operation.The height of the pedestal 21 can be adjusted by manual operation.

The nut fixing device 3 is a pair of left and right devices installed on both sides of the nut pedestal device 20, and has a fixing member 32 fixedly attached to the upper end of a support 31 having a predetermined length. .

The fixing member 32 has a protruding pin 33 as shown in FIGS. 4 and 5, and is designed in advance so that it can be fitted into a pin hole b' provided on the circumferential side of the oak. However, the pin 33 is not fixedly protruded from the fixing member 32, but is capable of sliding horizontally along a long hole 34 bored in the side surface of the member 32.

Further, the engagement surface between the fixing member 32 and the support column 31 has multiple grooves uniformly formed on the entire surface, such as a sawtooth cross section. The fitting allows accurate positioning and no movement, and by slightly loosening the bolt 35, the position in the protruding direction of the pin can be adjusted back and forth.

For this reason, the bolt hole 36 is formed into a long hole.

When tightening a nut using this device, fit and attach the sleeve a to the mounting portion 13 of the holding device 1, fit the roll C and predetermined attachments such as the presser ring d, and then tighten the end nut (b). Insert the screw and tighten.

First, place the nut) b on the pedestal 21 in an upright position, adjust the vertical direction with the jack 22, and then tighten the pin 3 of the nut fixing device 3.
3 into the pin hole b' of the nut.

Since the nut fixing devices 3 are arranged symmetrically with the same structure on the left and right sides of the nut (b), they fit into the pin holes b' on both sides of the nut in the same way and restrain movement in the rotational direction. I'll keep it.

At this time, the nut (b) is already placed in close contact with the threaded end of the sleeve (a).

This S drives the motor 15 of the holding device 1 to rotate the rotating shaft 11, thereby imparting rotation to the sleeve a attached to the mounting portion 13.

As a result, the nut (b), which is in close contact with the end of the sleeve, remains stationary until it is sequentially fitted into the threaded portion of the sleeve (a) and begins to move in the tightening direction.

As the nut b moves horizontally, the pin 3 of the nut fixing device
3 also moves horizontally little by little along the elongated hole 34, and eventually the tightening is completed.

During this tightening process, if the threaded state of the nut is not appropriate or if excessive load is applied to the rotating object after tightening is completed, the friction clutch 14 in the holding device is appropriately disengaged, and the rotational force from the motor 15 is is not transmitted to the rotating shaft 11.

Note that if the pin hole in b) is made longer in the axial direction, the pin does not need to be movable.

With the development of the device of the present invention, the work of tightening large nuts has become extremely easy, and the work that previously took 30 minutes can now be shortened to about 10 minutes.

Therefore, work efficiency has been greatly improved, workers have been relieved of heavy muscle work, and safety has also improved.

[Brief explanation of the drawing]

Figure 1 is a front cross-sectional view showing the overall configuration of the device of the present invention;
The figures are a side view of Fig. 1 seen from the ■-■ direction, Fig. 3 is a partial perspective view of the nut fixing device, Fig. 4 is a perspective view of the nut fixing member, and Fig. 5 is the V-- of Fig. 4. It is a cross-sectional view taken along the v-line. 1: Holding device for threaded object, 11: Rotating shaft, 12: Housing, 13: Mounting part, 14: Friction clutch, 15: Motor, 2: Nut holder device, 21: holder, 22: Jack, 3 : Nut fixing device, 31: Support column, 32: Nut fixing member, 33: Pin, 34: Long hole, 35: Mounting bolt, 3
6: Bolt hole, a: Roll sleeve, b: Nut, b
′: Pin hole.

Claims (1)

[Scope of utility model registration request] In a nut tightening device that uses a cylindrical body as an object to be screwed, a holding device that is fitted into the inner diameter side of the object to be screwed, holds the object horizontally, and rotates it at a slow speed so as to be able to slither; a height-adjustable nut pedestal device that holds the nut upright so as to engage with the threaded end of the threaded object held by the holding device; and a nut holder device that engages with a pin hole previously provided on the circumferential side of the nut. A nut tightening device comprising: a nut fixing device having a pin and installed on both sides of the nut pedestal device.