JPH0229886B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Industrial Application Field The present invention relates to a coupling device for tightening and coupling two or more members of mechanical parts or various structures using bolts and nuts.

(2) Prior Art As the above-mentioned coupling device, for example, the one shown in FIG. 8 is known. This is two parts 10
1,102 respective bolt holes 103,104
A bolt 105 is inserted into both the bolt holes 103 and 104 from the member 102 side, and a nut 106 is screwed into the threaded portion of the bolt 105 protruding from the bolt hole 103 to connect the two members 10.
1,102 are tightly connected.

(3) Problems to be solved by the invention By the way, in the above device, the nut 10
When tightening bolt 105 with a tightening tool such as a wrench, there is a risk that bolt 105 may spin freely.
The head of 05 must be held with a similar wrench or other tightening tool. Therefore, if the working space on the head side of the bolt 105 is narrow, the work will be extremely difficult and inefficient, and if the members 101 and 102 are large, the person tightening the nut 106 as described above and the head of the bolt 105 will have to work together. There were problems such as the need for two workers, one to hold the section.

This invention was made in view of the above problems, and even if the working space on the bolt head side during tightening work is narrow, the work will not be hindered at all, and the work can be easily performed by one worker. The purpose of the present invention is to provide a coupling device that can be used.

(4) Means for solving the problems In order to solve the above-mentioned problems, the present invention is characterized by adopting the following configuration.
In other words, two or more overlaid members are connected through countersunk washers using a bolt and a nut, which have engagement protrusions that protrude opposite each other in a direction that intersects the bolt axis at the end opposite to the threaded part. The two or more members are each provided with an opening into which the engaging protrusion of the bolt can be inserted, and the nut and countersunk washer are provided on the outer surface of the member on the threaded portion side of the bolt. A casing forming a sealed chamber for accommodating the engaging protrusion is fixed to the outer surface of the member on the side of the engaging protrusion of the bolt, and the inner surface of the side wall of this casing is An engaging portion for preventing rotation of the bolt that engages with a side surface of the engaging protrusion housed in the storage chamber is provided, and the top surface of the engaging protrusion of the bolt intersects with the longitudinal direction of the engaging protrusion. When two or more members are tightened by screwing nuts with the side surface of the engaging protrusion of the bolt engaged with the engaging part of the storage chamber; A concave arc surface into which the convex arc surface of the bolt is slidably fitted in the curved direction is formed on the inner surface of the top wall of the casing.

(5) Action The engaging protrusion of the bolt, which is accommodated in the housing chamber of the casing through the openings of two or more members, engages with the engaging part provided on the inner surface of the side wall of the casing to prevent the bolt from rotating. do. Therefore, the operator only has to screw the nut into the threaded part of the bolt, which has been prevented from rotating, and tighten it. Moreover, by tightening, the convex arc surface of the bolt fits into the concave arc surface of the casing, and this Two or more members can be tightened smoothly by the engaged protrusion of the bolt and the nut, making the work very easy. Moreover, since there is only enough space on the engaging protrusion side of the bolt to accommodate the casing, the work can be carried out satisfactorily even in a narrow work space.

(6) Embodiments Figures 1 to 6 show embodiments of this invention. This example was applied when a liner was attached to the inner surface of a CDQ coke bucket. 21 is a liner, and the liner 21 is connected to the structure body (CDQ coke bucket in this example) by bolts 25 and nuts 26.
It has been tightened to 22. 27 is a countersunk washer, and 28 is a hollow cylindrical casing fixed to the outer surface of the structure body 22 by welding or the like. The bolt 25 has a T-shaped engaging protrusion 25a in the shape of a rectangular parallelepiped provided at the end opposite to the threaded portion in a direction perpendicular to the bolt axis. The inside of the casing 28 is a storage chamber 29 that accommodates the engagement protrusion 25a of the bolt 25.
The top wall of the casing 28 is formed with an opening 30 having an oval shape or a similar shape larger than the planar shape of the engagement protrusion, through which the bolt 25 can be inserted into the accommodation chamber 29 from the engagement protrusion 25a side. The casing 28 has a sealed structure with no openings other than this opening 30. Further, on the inner surface of the side wall of the casing 28, a vertical wall-shaped protrusion 31 that engages with the side surface of the engagement protrusion 25a housed in the storage chamber 29 to prevent the bolt 25 from rotating is provided so as to sandwich the opening 30. and are integrally provided facing each other on a line passing through the center thereof. The inner bottom surface of the casing 28 that does not face the opening 30 has a tapered portion 32 that slopes upward in the circumferential direction from near both ends of the opening 30 toward the protrusion 31, and a tapered portion 32 in a portion adjacent to the protrusion 31. A guide portion for the bolt engaging protrusion 25a is formed by a flat portion 33 connected to the upper edge of the bolt engaging protrusion 25a. This guiding portion allows the bolt to engage with the engaging protrusion 25.
When a is positioned on the flat part 33 with its side surface engaging the protrusion 31, the top surface of the engagement protrusion 25a is curved in a direction intersecting the length direction of the engagement protrusion 25a. A concave arc surface 35 into which the formed convex arc surface 25b is slidably fitted is formed on the inner surface of the top wall of the casing 28. Openings 36 and 37, which are approximately the same size as the opening 30 or slightly larger than the opening 30, are bored in the structure body 22 and the liner 21 at positions corresponding to the opening 30 of the casing 28.
The opening 37 of the liner 21 is formed on the surface (inner surface) of the liner 21 and faces a recess 38 having a depth in which the countersunk washer 27 and the nut 26 are accommodated.
39 is a notch for rotation formed on the upper surface of the nut 26.

The length of the bolt 25 is such that it is substantially flush with the outer surface of the nut 26 housed in the recess 38 of the liner 21 when tightened. , the three end faces of the bolt 25 present almost the same surface.

In the above, in order to join the liner 21 and the structure main body 22, the liner 21 and the main body 22 are overlapped,
The opening 37 of the liner 21 and the opening 36 of the main body 22 are aligned, and the bolt 25 is inserted into the liner from the engagement protrusion 25a so that the engagement protrusion 25a of the bolt 25 is accommodated in the accommodation chamber 29 of the casing 28. 21
It is inserted through the recess 38 , the opening 37 , the opening 36 of the main body 22 , and the opening 30 of the casing 28 . Then, insert the countersunk washer 27 into the threaded part of the bolt 25,
The nut 26 is screwed onto the bolt 25 via the countersunk washer. By screwing this nut 26, the bolt 25
The engaging protrusion 25a passes through the tapered part 32 and connects to the flat part 3.
3, and its side surface is located at protrusion 3.
1 and prevents the bolt 25 from rotating idly. When the nut 26 is further screwed on, the bolt 25 moves toward the nut 26 and the convex arcuate surface 25b of the engagement protrusion 25a engages with the concave shape of the casing 28. It fits into the arcuate surface 35, and the tight connection between the liner 21 and the main body 22 is completed.

In the tightened state as described above, even if the bolt 25 is subjected to a load in the left-right direction as shown by the chain line in FIG. As the bolts 25 and nuts 25 expand and contract, the convex arcuate surface 25b of the engagement projection 25a and the concave arcuate surface 35 of the casing 28 slide, absorbing the displacement effortlessly and preventing the bolts 25 and nuts 26 from loosening or coming off. .

In addition, in this embodiment, the countersunk washer 27 and the nut 26
is accommodated in the recess 38 of the liner 21 and is designed not to protrude from the surface of the liner 21, so there is almost no wear on the nuts 26 etc. due to dust passing through the liner surface, and In addition, the flow of dust and the like is not disturbed, and the opening 36 of the main body 22 of the fastening portion
Since there is a casing 28 having a sealed structure on the outside that covers the opening 36, the dust does not leak out from the fastening area.

In addition, in this embodiment, dust on the liner 21 side flows through the openings 37 and 3 from between small holes such as the countersunk washer 27.
The bolts 25 enter the housing chamber 29 of the casing 28 through the bolts 6 and 30, fill the housing chamber 29, and adhere to the bolts 25.
The bolt 25 may become worn out and the bolt 25 may need to be replaced. In such a case, if dust remains in the storage chamber 29, it will interfere with the insertion of a new bolt, so an opening with an opening/closing lid may be provided in the side wall of the casing 28 to deal with the problem. It goes without saying that the detailed structure of can be changed and modified without departing from the gist. Furthermore, in the coupling means in the embodiment, the bolt 2
The side surface of the engagement protrusion 25a of No. 5 may be engaged with the protrusion 31 in advance and then the nut 26 may be screwed together. Alternatively, the bolt 25 may be inserted into the opening 36 of the main body 22 and then the liner 21 may be stacked. is also possible.

FIG. 7 shows a modification of the above embodiment, in which the bolt 2
In addition to the convex arcuate surface 25b provided on the top surface of the engagement protrusion 25a of No. 5, a convex arcuate surface 25c is formed by curving from both ends of the engagement protrusion 25a toward the center on the bolt axis side. This embodiment is the same as the embodiment described above, except that a concave arc surface 41 into which the convex arc surface 25c is slidably fitted is formed on the inner surface of the top wall of the casing 28. Therefore, similar parts are given the same reference numerals and explanations will be omitted. According to this modification, even if the bolt 25 and the nut 26 are subjected to a load in the front and back direction as well as a load in the left and right direction, this is absorbed by the sliding motion of the two arcuate surfaces, and the advantage is that the bolt 25 can be prevented from loosening. be.

(7) Effects of the Invention Since the present invention has the above-described configuration and operation, even if the working space on the side of the engagement protrusion that becomes the head of the bolt is narrow, the engagement protrusion can be easily connected to the engagement part of the casing. Since rotation is prevented by engagement, the work can be easily carried out by one worker by simply tightening the nut from the threaded side of the bolt. Moreover, since the engaging protrusion of the bolt is accommodated in the housing chamber of the casing, even if the nut becomes loose and the bolt comes off, accidents such as falling bolts can be prevented, and work can be done easily. From a safety standpoint, it is especially effective when working at heights. In addition, since the casing has a sealed structure except for the opening, even if dust, etc. passes through the surface of the member on the nut side and some of the passing dust, etc. flows to the engaging protrusion side, the casing It is possible to reliably prevent the leakage of noise by receiving it in the storage chamber, and also to prevent the noise generated within the device from leaking to the outside from the surface side of the nut side member.
Furthermore, even if the bolt is subjected to a load in a direction that crosses the engagement protrusion due to vibration or thermal expansion difference between each member in the fastened state, the resulting displacement can be prevented.
This is because the convex arc surface formed on the top surface of the engagement protrusion slides against the concave arc surface formed on the inner surface of the top wall of the casing, and the action of the countersunk washer allows for smooth absorption. , it is possible to reduce the direct shearing force applied to the bolts and prevent bolt breakage accidents. Furthermore, in addition to the above, even if the member on the threaded side of the bolt is large and has a large area and has many fastening points, if at least two places are fastened, the other fastening points will have both openings. Because it is easy to match,
Insert bolts in advance at all fastening points,
It is not necessary to fit all the openings of the members together at the same time, and when two or more members are stacked, the bolt can be easily inserted and fastened through the openings from the member side that is the threaded part of the bolt. It has excellent effects such as:

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional front view showing one embodiment of the present invention, FIG. 2 is a longitudinal sectional side view of the same as above, FIG. 3 is a plan view of the casing taken along the line - in FIG. 1, and FIG. 5 is a longitudinal sectional front view of the same casing, FIG. 6 is a longitudinal sectional side view of the same casing, and FIG. 7 is a longitudinal sectional front view corresponding to FIG. 1 showing a modified example of the above. 8 are longitudinal sectional front views of the conventional example. 21... Liner, 22... Structure body, 25...
... Bolt, 25a ... Engaging protrusion, 25b ... Convex arcuate surface, 26 ... Nut, 28 ... Casing,
29... Containment chamber, 30, 36, 37... Opening, 3
DESCRIPTION OF SYMBOLS 1... Protrusion, 32... Taper part, 33... Flat part, 35... Concave arcuate surface, 38... Concave part.

Claims (1)

[Scope of Claims] 1. 2 bolts overlapped by a nut and a bolt having an engagement protrusion that protrudes oppositely in the direction intersecting the bolt axis at the end opposite to the threaded portion.
A device for tightly joining the above members via countersunk washers, wherein each of the two or more members is provided with an opening through which an engaging protrusion of a bolt can be inserted, and the member on the threaded portion side of the bolt is provided with an opening through which an engaging protrusion of a bolt can be inserted. A recessed portion for accommodating the nut and the countersunk washer is provided on the outer surface, and a casing forming a sealed storage chamber for accommodating the engaging protrusion is fixed to the outer surface of the member on the side of the engaging protrusion of the bolt, The inner surface of the side wall of the casing is provided with an engaging portion for preventing rotation of the bolt that engages with the side surface of the engaging protrusion housed in the housing chamber, and the top surface of the engaging protrusion of the bolt The protrusion is formed into a convex arcuate surface curved in a direction intersecting the length direction, and when the side surface of the engagement protrusion of the bolt is engaged with the engagement part of the accommodation chamber, the bolt is screwed into the second part. A bolt-nut member characterized in that a concave arc surface is formed on the inner surface of the top wall of the casing, into which the convex arc surface of the bolt is slidably fitted in the curved direction when the above member is tightened. Coupling device.