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chair description

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This is the beginnings of what could become a very precise description of the chair in all its parts. When describing this chair I began wondering about the possibility of materializing this study so how to make the exact curvature of the leg as it bends in two directions. How would a jig be made for this? Could I make a chair myself? How convincing could it be? How far could this description be taken and at what point does it begin to become interesting or stop being interesting? Or where does it become interesting?

ÞThe Feet

The are four feet, all similar and made from black plastic, metal and felt. There are four parts to them.

Part 1 of the feet is cylindrical and, 10mm in diameter and 17mm long. This means that when inserted 17mm goes into the legs. After the 17mm it increases in diameter to 14mm this continues for 6mm. This portion acts as a stopper to ensure that only 17mm of the foot is inside the leg of the chair. Connection part 1 to part 3 is part 2.

Part 2 is a piece of metal 2mm wide running all the way through part 1 and some depth into part 3. A small portion of this metal 2mm is exposed in between part 1 and part 3, this allows part 3 to swivel even though part 1 is held firmly in place inside the legs.

Part 3 is made from plastic and is also cylindrical and also slightly ribbed but this time perhaps only for aesthetic reasons. At its widest point it is 23mm and it is 7mm deep. It also has a hole running through it which is made for part 2, the metal rod.

Part 4 is a pad made from felt, the kind which can be bought from hardware stores and is commonly attached to the legs of furniture. It is likely that this part was added to the chair after production when it arrived at the school. This part is designed to stop any scratching of the floor and perhaps to lessen unwanted noise from the chair.

ÞThe Legs

The legs are formed from 2 bended round metal tubes and 3 straight rectangular metal profiles which connect the 2 round tubes.

Part 1 – The tubes

There are 2 round metal tubes of 14mm diameter with a 10mm diameter hole inside. The length of metal used is close to 125cm. The Back leg of the chairs is angled forwards at 13 degrees from the vertical and also angled inwards 4 degrees from vertical. At a height of 38cm it makes a turn, bending both towards the horizontal and inwards making the distance between the legs narrower, from 38.5cm to 34.5cm. After the double bend the two legs continue in parallel at an upward angle of 6.5 degrees from horizontal. Then comes another bend, this time inline with the legs which takes the legs down to the ground at an angle 1 degree less than vertical. At the top of the bend the legs are 44cm off the ground

Part 2 – The connecting bars

There are 3 bars which connect the two leg sections together. 2 of them are on the upper part of the legs, one on the front part of the legs. The bars measure 25x10mm, are hollow and are welded to the legs. The space between the two upward facing bars is 20cm and between the front bar and the front upper bar it is 10cm, taking into account the curve of the legs. From the underside of the front bar to the ground it is 37cm. In each of the two upper bars are drilled four holes, which travel right through the bars. The inner of these holes have diameters of 8mm, while the holes to the outside have diameters of 6mm. These holes do not appear to have been added afterwards as their inside edges are powdercoated, so it can perhaps be assumed they correspond with a different model of the chair seat.

ÞThe Screws
The screws are 38mm long with a threaded section 35mm long. They have a head domed on the outside and flat on its underside. They are made to be screwed with a pz2 screwdriver bit. The thread of the screw is 3mm in diameter while the head is 9mm meaning an overlap of 3mm on all sides. The screw is coated, perhaps in zinc and is a litle worn in the slot for the screwdriver.

ÞThe rubber washers
Underneath the flat joining bars of the legs sit four black rubber washers, which the screws pass through before attaching to the chair seat. These washers are 22mm high. On the side closest to the ground there is a circular hole of diameter 12mm and depth 12mm. Passing through this is a narrower hole of diameter 5mm, which passes right the way through the rubber washer. This means there is an overhand of 7mm which allows the head of the screw to go into the washer only to a depth of 12mm. The screw when passing through protrudes to a distance of 21mm on the other side. On the chair side of the washer it is flat. In this flat circular side are 7 holes. One of these is the screw hole, which is in the center. The others circle around the outside and also have a diameter of 5mm. These also protrude to a depth of 12mm. Seen from the side the sides of the rubber washer initially travel in parallel before angling slightly inwards.

ÞThe chair seat.

The chair seat is made from a 10 layer laminated ply, sandwiched in between 2 layers of red formica. It is 10mm thick including the formica. The side closest to the legs is 40cm wide but is tapered so that at the back of the seat part it reaches 37cm. The backrest of the seat also tapers to the top ending at a width of 33 cm. The seat part is flat across its width but has a curve in it at its front which follows the curvature of the legs. The backrest part of the seat is shaped to fit the shape of the back of the user.

On the underside of the seat are glued four wooden blocks made from birch. These are rectangles of 30x50mm with a rounded profile at each end. They are glued on with a plastic based glue, in the middle of each wooden section is a threaded metal profile. This thread has an internal diameter of 3mm. The wooden blocks are in a profile of a wedge shape when seen from the side, at the thinner edge they measure 3mm whereas at the thicker edge they measure 5mm.

Also on the underside of the chair is a black square foam pad of width 20mmx20mm. The depth of this pad is 2mm. It is thought that this is to cushion the formica of the chair or the metal of the legs or both.


Written by alltheredchairs

January 23, 2012 at 4:32 pm

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