JP2002054621A - Flange nut - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flange nut technology for fixing a flange and the like for a vacuum device. SOLUTION: In a flat plate provided with plural threaded holes, a pitch of the plural threaded holes is equal that of through-holes of the flange.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flange nut used for fixing a flange or the like of a vacuum device by bolts and nuts.

[0002]

2. Description of the Related Art Vacuum devices are low vacuum, high vacuum, ultra high vacuum,
Components of various standards have been developed according to the level of vacuum, such as ultra-high vacuum. Typical flange standards for joining vacuum components include ICF standards and JIS standards. It can be considered that the flanges of the parts for high vacuum, ultra high vacuum, and ultra high vacuum that are commercially available are in accordance with any of the above flange standards. In the standard flange, a through hole or a screw hole is provided in the flange, and the size and arrangement pitch of the holes are determined.

[0003]

Most of the above flanges are through holes. In general, the screw is tightened by inserting a hex nut from the opposite side through a through-hole through a bolt. FIG. 5 shows a conventional screw tightening method. Parts flange 2 on equipment body flange 1
It seems that the viewport is attached. Washer integrated bolt 3 and washer integrated hexagon nut 4
It is a state in the middle of fixing with. During this operation, an accident that the hex nut is dropped may occur. When working alone, the three operations of pressing the component flange against the device body flange, inserting the bolt, and supporting the hexagon nut on the back surface must be performed with two hands, and a fall accident may occur. . Another problem using a hex nut is described. There may not be enough space on the back side of the flange of the device body. In this case, there is a case where a space for inserting a wrench cannot be sufficiently secured to fix the hexagon nut when tightening the bolt. If not supported by a wrench, the hex nut will rotate unnecessarily.

[0004]

According to the present invention, there is provided a flange nut in a flat plate having a plurality of screw holes, wherein a pitch of the plurality of screw holes is equal to a pitch of through holes of the flange. Second, in addition to the first feature, in the configuration in which the flat plates are connected by a plurality of chains, the screw hole pitch of the adjacent flat plate in a state where the flat plates connected by the chain is suspended on the flange is equal to the pitch of the flange through hole. It is characterized by being equal.

[0005]

In a flat plate having a plurality of screw holes, when the first feature in which the pitch of the plurality of screw holes is equal to the pitch of the through holes of the flange is provided, the flat plate is formed in the plurality of through holes of the flange. A plurality of screw holes of the flange nut are aligned and can be seen through. In this state, first, a bolt is passed through one of the through holes to abut against the screw hole of the flat plate,
Rotate the bolt while it is abutting so that the nut and the bolt do not separate. During this operation, another screw hole portion not used for temporarily fixing the flat plate can be pressed, so that the flat plate nut can be sufficiently pressed and there is no danger of falling. Subsequently, the same operation is performed on the other through hole and the screw hole. In this operation, since the flat plate is already held by one bolt, the work of inserting the second bolt can be completed simply by lightly pressing the flat plate so as not to rotate. When the bolt is tightened, the flat plate-shaped flange nut is supported by a plurality of bolts, so that it can be easily performed only by rotating the shaft of the bolt without unnecessary rotation. In addition to the first feature, in a configuration in which the flat plates are connected by a plurality of chains, a screw hole pitch of an adjacent flat plate is equal to the flange through hole pitch in a state where the flat plates connected by the chain are suspended from a flange. In the case where the second feature described above is provided, the arrangement of the flat plates can be regulated by the chain, so that all the screw holes of the plurality of flat plates can be aligned with the through holes of the flange. By using a chain having flexibility in connection, when the flange nut is set on the flange, it can slide into a narrow space and can be easily attached. Like a necklace, one end of the chain is opened during the mounting operation, and the ends of the chain are connected to each other by a hook or the like in the final stage of the mounting operation. This facilitates mounting. Since the attachment to the movable flange like a rotating flange is also a chain connection, the position can be easily corrected.

[0006]

FIG. 1 shows a first embodiment of the present invention. FIG. 1 is a view of the apparatus main body flange 1 viewed from the apparatus side. The drawing illustrates a state in which a component flange (not shown) is superimposed on the back side of the paper surface, a bolt is inserted into the component flange from the back surface direction of the paper surface to the front surface direction, and is screwed to the plate nut 5 illustrated in the drawing. The screw holes 6 of the screw flat nut exactly coincide with two adjacent through holes of the flange. This is because the hole pitch of the screw holes is adjusted to the standard of the corresponding flange. The standard of the screw hole also conforms to the standard. How to use this flat nut will be described. A spring pin is inserted into one of two screw holes provided in the flat nut, and the flat nut is temporarily fixed to the apparatus main body flange using the inner wall of the through hole of the flange. This spring pin can be easily attached and detached in a shape like an expanded hairpin. In the example of FIG. 1, four flat nuts are temporarily fixed by this method. Then, the component flange is pressed against the apparatus main body flange via the gasket, a bolt is inserted, the shaft is rotated, and the plate flange is fixed to the plate nut. In this case, the only bolt to be inserted is a pin to which the spring pin is not attached. Four bolts will be inserted. Rotate the bolt to secure the part flange so that it does not drop. Next, the spring pin is removed, and a bolt is inserted into the removed hole in the same manner as described above, and the bolt is fixed to the flat nut. Tighten the eight bolts evenly to permanently fix the component flange to the device body flange in a state where there is no vacuum leak.

FIG. 2 shows a second embodiment of the present invention. This is an example in which both a plate nut 5 ′ having three screw holes 6 and a plate nut 5 having two screw holes are used. A flat nut having three screw holes is screwed while inserting and fixing the nut by hand. The three-hole flat nut 5 'is used when the nut has to be slid into a narrow space where a hand or a tool cannot be inserted.

FIG. 3 shows a third embodiment of the present invention. This is an example in which eight flat plates 5 each having two screw holes 8 are connected by a chain 7. The hook 8 is wrapped around the back side of the apparatus main body flange protruding sideways, and the hook 8 is connected to the other end and temporarily fixed. Here, since the apparatus main body, which is a vacuum apparatus, is generally connected to the flange by a cylindrical tube, the chain chain flange nut can be temporarily fixed to the flange surface like a necklace. Since the cylindrical pipe is generally manufactured according to any of several types of standards, if chains corresponding to the several types are manufactured, temporary fixing can be performed as desired using the outer wall surface of the cylindrical pipe. It is. By adjusting the length of the chain, it is possible to arrange the screw holes exactly corresponding to the through holes of the flange. The figure depicts the situation just before using the hook hook.

FIG. 4 shows a fourth embodiment of the present invention. This is an example in which a plurality of chains 7 are used to connect the plate nuts 5 to strengthen the restriction of the connection posture and temporarily fix them in a desired shape. The pitch of the screw holes 6 includes a flat plate screw hole pitch 9 and a chain connecting screw hole pitch 10. Since the screw holes on the flat plate are provided in accordance with the flange standard such as ICF, the hole diameter, the screw pitch, and the screw hole pitch match the corresponding ones. When the two chains are connected as shown in FIG. 3 and mounted as shown in FIG. 3, the tension of the chain is designed and manufactured so that the chain connecting screw hole pitch, which is the interval between the plate nuts 5, conforms to the flange standard such as the above ICF. ing. The thickness of the flat nut is 4 mm, and the size is provided with two screw holes so that the peripheral residue does not become less than 3 mm. In the figure, the design is made so that the distance from the center of the short side to the circumference of the screw hole is 3 mm or more.

[0010]

The use of the flange nut of the present invention makes it possible to easily and safely screw a vacuum device. Work time is shortened. Since the number of parts is reduced, parts management is easy.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a first embodiment of the present invention.

FIG. 2 is a configuration diagram showing a second embodiment of the present invention.

FIG. 3 is a configuration diagram showing a third embodiment of the present invention.

FIG. 4 is a configuration diagram showing a fourth embodiment of the present invention.

FIG. 5 is a sectional view showing a conventional example.

[Sign]

1 is an apparatus body flange, 2 is a component flange, 3 is a washer integrated bolt, 4 is a washer integrated hexagon nut,
5 and 5 'are flat nuts, 6 is a screw hole, 7 is a chain, 8
Is a hook, 9 is a pitch of screw holes on a flat plate, and 10 is a pitch of screw holes of a chain coupling.

Claims (2)

[Claims] 1. A flange nut according to claim 1, wherein a pitch of said plurality of screw holes is equal to a pitch of through holes of said flange in a flat plate having a plurality of screw holes. 2. A structure in which a plurality of flat plates are connected by a chain according to claim 1, wherein a pitch of a screw hole of an adjacent flat plate is equal to the pitch of the flange through-hole in a state where the flat plates connected by the chain are suspended from a flange. And flange nut.