Tilting chair is not very common and is made of rough wood to give him a rustic glance. This tilting chair not very common is made of rough wood to give him a rustic glance. The design of chair considers the envisaged use, ergonomics (as it comfortable is for the occupying one), as well as functional conditions not-ergonomic such as the size, the capacity of pile, the capacity of fold, the weight, longevity, the resistance of spot and the artistic design. The envisaged use determines the position of sited places desired. “To charge the chairs”, or any chair intended for the people to work at an office or a table, including dinner of the chairs, can only rest very slightly; otherwise the occupant is too remote office or table. Dental chairs are necessarily rested. The easy chairs for the television of observation or films are some share in the interval according to the size of the screen.



The ergonomic designs distribute the weight of the occupant to various parts of the body. A seat which is higher results in the balancing feet and pressure increased on the lower part of the knees (“fold political”). It can also have as consequence no weight on the feet which means more weight elsewhere. A lower seat can shift too much weight with the “bones of seat” (“sciatic tuberosities”). A wide seat and back will shift the weight with the occupant behind. This can be more comfortable for some by reducing the weight on the sector of seat, but can be problematic for others which have bad back. Generally if the occupant east suppose to rest for a long time, weight must be removed the sector of seat and of the “easy” chairs intended for long periods of the meeting generally at least are slightly rested thus. However, to rest cannot be appropriate for the chairs intended for work or to eat with the table. The back of the chair will support part of the weight of the occupant, reducing the weight on other parts of the body.

Generally the files come in three faces: To lower the support of files behind only the lumbar area. To shoulder the files of size the back and the shoulders entireties support. The head-rests support the head as well and are important in vehicles to prevent damage of neck of “whiplash injury” in collisions a posteriori where the head is launched behind suddenly. The wide chairs have typically at least files of size of shoulder to shift the weight with the shoulders with the place right of the lower back. Some chairs have rest of foot. A stool or any other simple chair can have a bar right or curved simple close to the bottom which it is necessary that the guard of children places its feet above. A chair of kneeling adds an additional part of body, the knees, to support the weight of the body. Rest-to hold the chair distributes the major part of the weight of the occupant to the feet. Church chairs Church chairs Beaucoup of chairs is upholstered or has cushions. The filling can be on the seat of the chair only, the seat and the back, or also on any rest of arm and/or rest of foot the chair can have. The filling will not shift the weight with various parts of the body (unless the chair is so soft that the form is changed). However, upholstering distributes the weight by increasing the surface of contact between the chair and the body. A chair out of wooden lasts feels hard because the point of contact between the occupant and the chair is small.

The same body weight above a smaller sector means greater pressure on this sector. The propagation of the sector reduces the pressure to any point given. Instead of the filling, flexible materials, such as the wicker, can be employed in the place with the similar effects to distribute the weight. Since the major part of the body weight is constant in the back of the seat, upholstering there should be firmer than before seat which has only the weight of the legs to support. The chairs which have a filling which is the same ones before and backs of density will feel soft in the sector back and hard with the lower part of the knees. There can be cases where the filling is not desirable. For example, in the chairs which are planned mainly for the external use. Where the filling is not desirable, to circumvent can be employed in the place. A circumvented pan of seat tries to distribute the weight without filling. By matching the shape of the buttocks of the occupant, the weight is distributed and of the maximum pressure is reduced.