JPH0246512Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial field of application> The present invention is a manhole receiving frame having an elliptical non-circular bolt hole or a non-circular recess on the surface, and a manhole receiving frame having a protrusion on the lower surface or a part thereof. The washer is combined with a washer that can be bent downward to form a protrusion, and when fixing the receiving frame, the protrusion of the washer is inserted into the bolt hole or recess, and the washer is attached to the receiving frame via the bolt and nut. The present invention relates to a fixing device for a manhole receiving frame characterized by a fixed structure.

<Prior art> The applicant has already developed and put into practical use the techniques shown in Utility Model Application No. 57-168551 and No. 58-9518 as this type of fixing device, but the former has no special relevance. There are disadvantages such as high cost because it is necessary to use a receiving frame with a protruding stopper.
The latter has a simple structure, but it only locks the nut and cannot engage the washer or receiving frame underneath, so it is difficult to keep the receiving frame in a stable state as a whole and against vibrations. There were drawbacks such as the difficulty of fixing it so that it would not loosen even if it was twisted.

<Problems to be solved by the invention> The device according to the present invention was developed in view of these drawbacks of the conventional device, and is particularly easy to install and assemble, and also firmly engages the nut with the washer. The aim is to provide a completely new fixing device that can.

<Means for Solving the Problems> The present invention includes a bolt, a nut, and a predetermined square hole into which a part of the outer corner corner of the nut can fit, and the outer circumference is formed on the outer surface of a square washer. The nut and the square washer are covered with the lock washer, and a part of the outer corner of the nut is inserted into the square hole of the lock washer, and the outer circumference is bent. This is a fixing device for a manhole receiving frame, characterized in that a part is engaged with an outer surface of a square washer.

<Function> In the device according to the present invention, a lock washer is configured and used which has a square hole into which a nut can fit and which can engage with the outer surface of the square washer. After tightening the washer, the nut and square washer can be easily coated, and furthermore, part of the outer corner of the nut is inserted into a part of the square hole, and the bent outer peripheral part is engaged with the outer surface of the square washer. By doing so, the nut and the square washer can be interconnected, thereby preventing the nut and the square washer from loosening due to vibrations of the vehicle or the like.

<Example> To specifically explain an example of the device according to the present invention with reference to figures, in Figs. 1 to 4, 1 is an anchor bolt embedded in a diagonal wall pipe 2 of a manhole body , 3 are bolts screwed onto this anchor bolt 1. Reference numeral 4 designates a receiving frame for a manhole cover placed on the inclined wall pipe 2, and a square washer 5 having a reverse taper on the outer surface is placed on the upper surface of the receiving frame. The receiving frame 4 has an oval bolt hole 6.
A pair of protrusions 7, which can fit into the long diameter inner surface of the bolt hole 6, are also provided on the lower surface of the square washer 5. A nut 8 is screwed onto the bolt 3 and tightens the square washer 5 to the receiving frame 4. 9 is a lock washer covered with this nut 8 and square washer 5,
A rectangular hole 10 having 12 corner portions that can be fitted into a part of the outer circumference of the nut 8 is bored approximately in the center thereof, and both corresponding outer circumferences are formed on the outer surface of the square washer 5. A bent outer peripheral portion 11 that can be engaged is formed.

The square hole 10 described above may have the same number of corners as the number of corners on the outer periphery of the nut 8, but it is preferable to have a hole with a greater number of corners than the number of corners on the outer periphery of the nut 8. The fit is flexible and good.

Moreover, in order to have the shape of the bent outer circumferential portion 11 have a function of absorbing the positional deviation between the lock nut 9 and the square washer 5, it is more effective to provide a tapered shape to prevent lifting, as shown in the cross-sectional view.

As shown in the above embodiment, a non-circular bolt hole 6 such as an ellipse is formed in the receiving frame 4, and a pair of protrusions 7 that can be fitted into the long diameter portion or a predetermined portion of the bolt hole 6 are protruded on the lower surface of the square washer 5. If provided, the square washer 5 can be engaged with the receiving frame 4. Therefore, when this method is adopted, the nut 8, the square washer 5, the lock washer 9, and the receiving frame 4 can be linked integrally with each other, thereby preventing the receiving frame etc. from being damaged by vibrations of the car, etc. Loosening can be completely prevented.

Regarding the assembly configuration of the device according to the present invention, the first
As shown in Figures 3 to 3, a square washer 5 is placed on the receiving frame 4, and after tightening it with a nut 8, a lock washer 9 is coated on the square washer 5, and a part of the outer corner of the nut 8 is covered with a square washer 9. The square washer 5 engages with a part of the corner of the square hole 10 and bends the outer peripheral part 11.
By locking on the outer surface of the nut 8,
The lock washer 9 and the square washer 5 can be interconnected.

If the nut 8 is misaligned and an attempt is made to fit a part of the outer circumferential corner of the nut 8 to a corner of the square hole 10, the situation as shown in FIGS. 5 and 6 may occur. However, even in this case, the positional shift can be absorbed by the bent outer circumferential portion 11 of the locking wedge 9, and the locking wedge 9 can be prevented from falling off.

As shown in FIG. 7, the square washer 5 can also be configured with its outer peripheral edge slanting upward.

<Effects of the invention> Since the device according to the invention has the structure and operation as described above, after tightening the corner washer with a nut, by covering the lock washer, it is possible to easily engage them with each other. be able to,
In addition, this lock washer can be easily attached and detached and can be used many times.Furthermore, if the bottom surface of the square washer is provided with a protrusion that can be fitted into the bolt hole of the receiving frame, a special protrusion is provided on the receiving frame. This eliminates the need for this, and therefore, a general receiving frame can be used as is.

[Brief explanation of the drawing]

FIGS. 1 to 4 are explanatory diagrams showing this embodiment, and FIGS. 5 to 7 are explanatory diagrams of other examples. 1 and 3 are bolts, 4 is a receiving frame, 5 is a square washer, 7 is a protrusion, 8 is a nut, 9 is a lock washer, and 11 is a bent outer periphery.

Claims (1)

[Scope of utility model registration request] A bolt, a nut, and a lock washer that has a predetermined square hole therein into which a part of the outer corner corner of the nut can fit, and has a bent outer periphery that allows the outer periphery to engage with the outer surface of the square washer. , consisting of a square washer, the nut and the square washer are covered with the lock washer, a part of the outer corner corner of the nut is fitted into the square hole of the lock washer, and the bent outer circumference is engaged with the outer surface of the square washer. A fixing device for a manhole receiving frame.