A lot of trouble delivers the design of internal stairs, for example, the attic. For convenient large marches, as a rule, not enough space and they are very steep, which is dangerous, especially for older people.
In one of the rooms of the old Czechoslovak magazine offered a curious compromise that we present to our readers. Down, this design resembles a regular staircase, with steps which are quite comfortable to climb. Folded as it rises and does not occupy much space, face the horizontal “door” leading to the attic. The whole design operates the motor, turn on the bottom button.
The “door” on the ceiling
Some design details we deliberately do not show, as they will still be made locally. Anyone, therefore, who undertake the implementation of this idea, must have a certain technical skill, and here is the drawing (Fig.1) gives the necessary General picture of the structure and its main nodes.
The attic hatch, as a rule, the roof construction is usually already there. Therefore, for stairs with a width of 600 mm will be required to produce his frame size mm. 1400×750 Board it required to be strengthened. For this it is necessary to use steel angles dimensions 50x50x3 mm, which are welded two identical frames (20): one is mounted on the hatch top, the other from below and then the frame welded together or screwed with screws to the sides of the hatch.
1. Mechanized attic stairs:
1—long arm foldable frame ladder (outer pipe 25x25x2);
2—short arm of a skeleton (inner pipe 25x25x2);
3,4—cropped (end) the levers of the frame of the ladder;
5 —the lever of the limit switch of the motor;
6—step (6A—her support);
7—tubular rails for rollers of the ladder frame (2 PCs.);
8—tube-limiter (2 PCs.);
9—front drive drums (2 PCs.);
10 drum drive (2 PCs.);
11—worm drive mechanism;
15—a pulley of the ladder;
16—skating rink stairs;
17—lower limit switch;
19—a cylinder (or bearing);
20—framing the niche of the hatch (frame from steel angles);
21—a rope (rope);
23 —the axis of the levers stairs;
24—axis rollers stairs;
25—the axis of the pulley;
26—frame shield “door”.
Frame shield doors (26) is also from corners, but for this purpose you can use the corners of the smaller sizes 36x36x3 mm, and the size of the “door” with the parts of the pick up so that she was in the frame of the hatch with a gap (on the perimeter) of at least one centimeter. In frame “doors” later, in the final stage of the work, instead of a shield, you can insert a Board or plank, but now you need to attach to the frame two tubes (7) size 70x35x2,5 mm is the “rails” along the long sides of the “door” (10 mm from the surface). The door should turn on three (100×100 mm) door hinges, one half of which need to be screwed to the narrow Board of the hatch.