JPS6326557Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a temporary fixing device for a ladder storage frame that constitutes the skeleton structure of a ceiling retractable staircase, and relates to a support means for fixing the storage frame to a joist in a ceiling opening.

A structural method of retractable stairs in the ceiling is known as a means of effectively utilizing the play space under the attic, and an overview of this method will be explained here.

The staircase includes a storage frame consisting of a square frame fixedly attached to the opening edge of the ceiling, and a storage lid that is hinged to one side of the lower edge of the storage frame and swings downward to open and close.
It is formed by a folding ladder attached to the top surface of the storage lid, and when the storage lid is in the closed storage position, the bottom surface of the lid plate communicates with the ceiling surface and spoils the appearance of the ceiling. In addition, when the storage lid is opened diagonally downward and the ladder is extended to the floor, it is easy to climb up and down the ladder to access the space above the ceiling, just like with regular built-in stairs. It is now possible to go in and out.

However, a joist is fixed to the edge of the ceiling opening for reinforcement, and the lower end of the storage frame is fixed to the joist by nailing, etc., while the storage lid swings. The end is supported by the storage frame via a suspension link, and the weight torque of the storage lid is balanced by a suspension spring engaged between the end and the storage frame.

Folding ladders are formed by connecting multiple (usually three) partial ladders, each of which is hinged at the opposite end of each step, and can be easily folded by stacking the partial ladders. It is designed to be foldable.

By the way, according to the structure of conventional retractable stairs,
When installing stairs, the storage frame has to be carried up to the ceiling and then attached to the joists, such as tightening bolts, which is a hassle, which requires a lot of manpower. The problem was that the work itself was cramped and difficult.

The present invention was devised to solve the above-mentioned difficulties, and the purpose of the present invention is to enable the storage frame to be easily fixed to the joists while being pushed into the ceiling opening from below. To provide a temporary fixing device for a ladder storage frame.

The present invention will be described below based on an illustrated embodiment. First, the configuration of a retractable staircase equipped with a temporary fixing device of the embodiment will be described with reference to FIG. 1.

The storage frame 1 is fixed to the side of a joist 3 fixed to the back edge of the ceiling opening 2 by nailing, screwing, etc., with its lower edge facing the ceiling opening 2, and the storage frame 1 A base end of a storage lid 5 is connected to the lower end of the inner wall on the depth side of the storage lid 5 via a pair of left and right hinges 4.

The swinging ends of the storage lid 5 are supported by suspension metal fittings 7 fixed to the left and right inner walls of the storage frame 1 via a pair of left and right suspension links 6. It is formed by upper and lower arms 8 and 9 which are knuckle-connected in the middle.

Furthermore, a pair of hanging springs 11 each made of a coil spring are installed between the lower end of each lower arm 9 and each hanger 10 fixed to the left and right corners of the inner wall on the depth side of the storage frame 1. are multiplied, and the weight load torque applied to the storage lid 5 is balanced in the closed state.

In addition, a lock mechanism 12 is provided at the swing end of the storage lid 5.
is suspended horizontally, and a lock key 13 is attached to the center of the mechanism 12, so that the lid 5 is locked when closed.

Next, the folding ladder 14 is formed by upper, middle, and lower partial ladders 16, 17, and 18 that are connected to each other by left and right hinge fittings 15, and the upper partial ladder 16 has four corners. Fixing bracket 1
The upper partial ladder 16 is fixedly held on the storage lid 5 at a floating height via a ladder 9, and handrails 20 are provided upright on each of the left and right side plates of the upper partial ladder 16.

By the way, the temporary fixing device of the embodiment, as shown in FIGS.
In other words, in the case shown, the front and rear 2 of each left and right side plate 1a
It is formed by a vertical groove 21 bored at a location and a lead-shaped temporary fitting 23 fixed with a screw 22 at the middle height of the groove 21. The metal fitting 23 made of a spring plate is The upper half forms a base 23a with a U-shaped cross section that is inscribed in the groove 21, and has an insertion hole 23b for the screw 22, and the lower half has a tongue-shaped abutment that protrudes toward the widening hem. The end of the abutment piece 23c is bent inward into an L-shape.

In the state shown in FIGS. 3 and 4, in which the storage frame 1 is attached to the joist 3 on the back side of the opening edge of the ceiling 24, the lower surface of the L-shaped bent end of the abutting piece 23c of the metal fitting 23 is While coming into contact with the top surface of the joist 3,
The storage frame 1 is fixed to the joist 3 with nails 25 inserted into appropriate positions on the inner surface of the side plate 1a.

In order to attach the storage frame 1 equipped with the locking device of the embodiment configured in this way to the ceiling opening 2, there is no need to lift the storage frame 1 above the ceiling 24 each time during the installation work. If the storage frame 1 is pushed into the ceiling opening 2 from below while sliding the abutment piece 23c of the metal fitting 23 into the groove 21, the abutment piece 23c
The storage frame 1 is stopped at the place where the nails 25 go over the side surface of the joist 3, and therefore, the nail 25 can be easily and reliably driven without supporting the storage frame 1 manually.

As described above, the temporary fixing device for a ladder storage frame according to the present invention has a lead-type temporary fixing metal fitting that is activated to impact the storage frame pushed into the ceiling opening from below at a predetermined installation height. Since it is configured to face the outside surface of the storage frame, the fixing work to the joists is facilitated, and this has the effect of improving the ease of installation of the retractable staircase and the safety of installation.

Furthermore, since the base portion 23a of the temporary fitting 23 is fixed in the vertical groove 21 formed on the outer surface of the storage frame 1, when the storage frame 1 is inserted, the protrusion of the abutting piece 23c It is pushed into the vertical groove 21 and stored, so that the outer surface of the storage frame 1 and the inner circumferential surface of the mounting opening 2 are substantially in close contact with each other, resulting in a safe structure with no looseness.

Furthermore, the inclined abutting piece 23 of the temporary fitting 23
The tip of c is bent inward into an L-shape, and the bent lower surface of the tip comes into contact with and is supported by the top surface of the joist 3, so that the tip of the temporary fixing fitting 23 bites onto the joist 3. This has the effect of improving the safety and positioning accuracy of temporary fixing of the ladder without being pushed open along the upper surface of the joist 3.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a retractable staircase equipped with an embodiment device, FIG. 2 is a perspective view of a temporary fixing device for a ladder storage frame showing an embodiment of the present invention, and FIG.
FIG. 4 is a side view of the storage frame in the attached state; FIG. 4 is a front cross-sectional view taken along the line - in FIG. 3; and FIG. 5 is a perspective view of the temporary fitting shown in FIG. 4. 1...Storage frame, 2...Mounting opening, 3...Joist,
14...Ladder, 23...Temporary fitting, 23c...
Collision piece, 24...ceiling.

Claims (1)

[Scope of utility model registration request] A storage frame 1 consisting of a rectangular frame, in which a folding ladder 14 is stored, and whose lower edge faces a staircase mounting opening 2 in the ceiling, is arranged around the periphery of the mounting opening 2. In a temporary fixing device for temporarily fixing a joist 3 fixedly installed on the back side of a ceiling, it is a lead-shaped metal fitting made of a spring plate, and the base 23a at the upper end is a vertical piece formed on the outer surface of the storage frame 1. Groove 2
A locking metal fitting 23 is provided, which is fixed in the inside of the metal fitting 1, and whose lower end extends out in an inclined shape, and whose tip forms an abutment piece 23c bent inward into an L-shape. When the storage frame 1 is inserted into the mounting opening 2 from below, the lower surface of the L-shaped bent tip of the abutting piece 23c of the temporary fitting 23 is aligned with the upper surface of the joist 3. A temporary fixing device for a ladder storage frame, characterized in that the device is formed so as to come into contact with the ladder storage frame.