JPS5998971A - Bearing structure of ceiling inspection port - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bearing in a ceiling inspection opening installed in a ceiling for inspecting and repairing various equipment such as wiring, piping, and air ducts installed inside the ceiling, especially for opening and closing operations of an inner frame. This invention relates to a bearing structure for a ceiling inspection opening that prevents the rotating shaft from slipping out of the bearing.

Conventional ceiling inspection ports have a rotary shaft protruding toward the outer frame on the inner frame, and this rotary shaft is removably pivoted to an inverted-shaped bearing formed in the outer frame that is open at the top. There was something that opened and closed the frame.

By the way, this method involves simply fitting the rotating shaft formed in the inner frame from above into the inverted-shaped bearing formed in the outer frame with one upper end open. is completed, making it convenient for constructing a ceiling inspection port in the ceiling. However, with such an inverted-shaped bearing, if the inner frame is pushed up in an open state, if the inner frame is touched during inspection work, or if the inner frame is suddenly released and the hand is released, the rotation will occur. There are other inconveniences such as the shaft falling out of the bearing, the inner frame coming off the outer frame, falling to the floor and being damaged, or colliding with someone on the floor, causing an unexpected accident.

Therefore, in order to solve the above-mentioned disadvantages, this invention has a rotating shaft provided on the outer surface of one end side of the fragments on two sides of the inner frame, and a rotating shaft extending 1'' from the outer surface of the fragments of the outer frame opposite to this rotating shaft. In a ceiling inspection opening consisting of a bearing provided to removably fit and pivotally support a rotating shaft, the bearing forms an inverted groove with one side open, and at the very end of this groove. forms a pivot part that pivots the rotating shaft, and a part of the opening of the vertical part located above the pivot part is formed into a wedge shape to make the diameter smaller than the shaft diameter of the rotating shaft, and the vertical part By providing a bearing structure for a ceiling inspection port, in which a part of the opening of the guide part extending horizontally in communication with the part is also formed into a wedge shape to make the opening smaller than the axis diameter of the rotating shaft. The object of the present invention is to obtain a bearing structure for a ceiling inspection opening in which the rotating shaft does not come off from the bearing during opening and closing operations of the inner frame.

An embodiment of the present invention will be described below with reference to the drawings.

Figure 1 is an overall plan view of the ceiling inspection opening. 1 is an outer frame made of aluminum alloy, in which four fragments are framed in a roughly rectangular shape. A bearing is fixed to the outer frame 1, and the outer frame 1 is fitted into an opening in the ceiling and fixed to the ceiling by appropriate fixing means.

An inner frame 2 is housed within this outer frame 1, and the inner frame 2 is made of aluminum alloy like the outer frame 1, and is made of four fragments arranged in a substantially rectangular shape, and faces the bearing of the outer frame 1. A rotating shaft is provided on the two fragments.

In addition, a cover plate 3 (Fig. 3) made of substantially the same material as the ceiling plate is attached to the four fragments of the inner frame 2, and as the inner frame 2 rotates about the rotation axis, the inner frame 2 opens and closes to allow people to enter and exit the ceiling inspection opening. Reference numeral 8 denotes a locking device, which is engaged or disengaged by moving the locker 9 forward or backward.

Further, the detailed structure of the inner and outer frames described above will be explained with reference to FIGS. 2 and 3. Each frame piece of the outer frame l has a main edge 1a extending in the opening direction, and the main edge 1a Beaded edges 1b in the left and right direction from the top and bottom ends.

The beaded edges 1c are made to protrude, respectively. A bearing 4 is attached to the outer surface of one longitudinal end of the opposing main edges 1a of the two fragments of the outer frame 1.

This bearing 4 is made of synthetic resin such as nylon by injection molding, has a substantially flat plate shape, can be slightly elastically deformed, and has a reinforcing portion 4a protruding from the back side toward the main edge 1a of the outer frame 1. has been done. A slotted shaft cylinder 4b is formed above this reinforcing portion 4a. Further, on the surface of the bearing 4, that is, on the side facing the inner frame 2, an inverted-shaped groove is formed so that the rotating shaft can be easily inserted into the bearing 4, and the ultimate pivot point of this inverted-shaped groove is formed. 4c pivotally supports the rotating shaft 6. A part of the opening of the vertical portion 4d located above the pivot portion 4c is formed into a wedge shape as shown in FIG. 2, ie! is made smaller than the shaft diameter of the rotating shaft 6.

The guide groove 4e, which communicates with this vertical portion 4d and extends substantially in the water direction, and whose tip is open to the outside, also has a part of its opening!
Form into a wedge shape as in 1, that is! 1 is also made smaller than the shaft diameter of the rotating shaft 6.

In order to attach the bearing 4 having such a configuration to the main edge 1a of the frame piece of the outer frame 1, first, the reinforcing part 4a of the bearing 4 is formed in advance on the main edge 1a of the outer frame 1, and the reinforcing part 4a is attached to the main edge 1a of the outer frame 1. At the same time, the slotted shaft cylinder 4b formed in the bearing 4 is inserted into the shaft cylinder insertion hole 1e previously formed in the main edge 1a of the outer frame 1, and then the slotted shaft cylinder Insert pin 5 into the shaft hole of cylinder 4b.
By press-fitting and expanding the slotted shaft cylinder 4b outward,
The bearing 4 is closely fixed to the main edge 1a of the outer frame 1.

Each fragment of the inner frame 2 accommodated in the frame piece of the outer frame 1 to which the bearing 4 is attached has a main edge extending in the opening direction parallel to each main edge 1a of the outer frame 1. 2a, a beaded edge 2b projects from the upper end of the main edge 2a toward the main edge 1a of the outer frame 1, and a beaded edge 2c projects from the lower end of the main edge 2a in the left-right direction. ing.

Further, a rotating shaft 6 is provided outwardly protruding from the main edge 2a of the inner frame 2 at one end of the two opposing fragments, and the inner frame 2 is rotated about the rotating shaft 6 to open and close. It has become so. Further, an outwardly directed protruding edge 2 c' of the beaded edge 2 c is located below the rotating shaft 6 .

To attach the inner frame 2 having the above structure to the outer frame 1, as shown in FIG. Introduced from the guide groove 4e,
It is dropped onto the pivot part 4c through the upper opening 4d.
Support it with. In this case, the rotating shaft 6 is introduced into the insertion part j1 of the guide groove 4e and the insertion part of the vertical part 4d! However, if you push the rotating shaft 6 strongly, the bearing 4 will elastically deform! 1,! However, the rotating shaft 6 can be expanded slightly, and there is no problem in introducing the rotating shaft 6. In this way, the rotation shaft 6 of the inner frame 2 is pivotally supported by the bearing 4, and then the inner frame 2 is rotated in the horizontal direction to bring the inner frame 2 into a closed state. Then, when the inner frame 2 is opened from this closed state, that is, in the state where the inner frame 2 is suspended as shown in FIG. Figure 4)
Although the diameter of the vertical portion 4d is smaller than the shaft diameter of the rotating shaft 6, the inserted portion of the vertical portion 4d is pushed up! The rotary shaft 6 is held down at this portion, and as a result, the inner frame can be opened smoothly while suppressing the backlash of the rotary shaft 6. Also, when the inner frame is suddenly opened, even if the rotating shaft 6 comes out of the pivot portion 4c 75, the vertical portion 4d will not be inserted! The repulsive force can be weakened by inserting the next part of the guide groove 4e! 1, the rotating shaft 6 pivots. Furthermore, as mentioned above, the bearing 4
Although the inner frame 2 is slightly elastically deformed, when the inner frame 2 is in an open state, the force pushing up the inner frame 2 from below is exerted by the rotating shaft 6 and the clamping part j.

! The force that expands 1 does not work.

As explained above, according to the present invention, a part of the opening in the vertical part of the bearing is formed into a pincer shape and is made smaller than the rotating shaft diameter, so that when the inner frame is opened, the rotating shaft moves upward. is held down by the clamping portion to prevent play in the rotating shaft body, allowing the inner frame to be opened smoothly, and there is no fear that the rotating shaft will come off from the bearing.

In addition, a portion of the opening of the vertical portion and the guide groove is formed into a pincer shape and is made smaller than the shaft diameter of the rotating shaft.
If the rotating shaft comes out of the pivot if it comes into contact with the inner frame during inspection work, if the inner frame is suddenly opened, or if a force pushing up the inner frame from below is applied, the vertical part located above the pivot will be removed. The repulsive force can be weakened by the inserted part of the opening, and as a result, the inner frame will not fall to the floor below and be damaged, and will not collide with people on the floor, which is effective for safety. It has the advantage of being large.

[Brief explanation of the drawing]

゛ The drawings show one embodiment of the present invention, in which Fig. 1 is a plan view of the entire ceiling inspection port, Fig. 2 is a sectional view taken along the line ■-■ in Fig. 1, and Fig. 3 is a cross-sectional view taken along the line I in Fig. 1. -1 line sectional view, FIG. 4 is a state diagram where the inner frame is opened, and FIG. 5 is an explanatory diagram of preventing the rotating shaft from coming off from the bearing. 1...Outer frame, 2...Inner frame, 4...
...Axis, 4a...Pivotal part, 4b...Vertical part, 4C...Guide groove,! ,! 1...
Pincer part. Representative Patent Attorney Atsushi Suzuki Figure 1 ``'' Figure 2 1m

Claims (1)

[Claims] A rotating shaft is provided on the outer surface of one end side of the debris on two sides of the inner frame, and the rotating shaft is removably fitted to and pivotably supported by the debris on the outer frame that faces the rotating shaft. In the ceiling inspection opening consisting of a bearing, the bearing forms an inverted groove with one side open, and a pivot portion for pivotally supporting the rotating shaft is formed at the end of the groove. A part of the opening of the vertical part located above the branch is formed into a wedge shape so as to have a diameter smaller than the diameter of the rotating shaft, and the opening of the guide part that communicates with the vertical part and extends in the horizontal direction. A bearing structure for a ceiling inspection port, characterized in that a portion thereof is also formed into a wedge shape so that the shaft diameter is smaller than the shaft diameter of the rotating shaft.