Classifications

• • A—HUMAN NECESSITIES
  • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
  • A47C—CHAIRS; SOFAS; BEDS
  • A47C7/00—Parts, details, or accessories of chairs or stools
  • A47C7/36—Support for the head or the back
  • A47C7/40—Support for the head or the back for the back
  • A47C7/46—Support for the head or the back for the back with special, e.g. adjustable, lumbar region support profile; "Ackerblom" profile chairs

Definitions

• the present invention relates to a seat comprising a foot part, a seat part and a back part, arranged so as to allow a sitting position in which the pelvis is straight, the back part being designed to promote this position.
• a seat according to the invention makes safe and easy the prolonged maintenance of the sitting position by effectively stabilizing the pelvis, therefore allowing a correct arrangement of the trunk on its base. Such a seat helps reduce fatigue and pain in the trunk when seated.
• the posterior support or backrest as back support in the sitting position must be comfortable and allow the user to maintain this position for a long time without physical damage, with minimum fatigue and maximum freedom of movement;
• the backs of office chairs at work generally include a part molded on the anatomy of the human body and serving as support for the lumbar spine.
• the bottom of the backrest can sometimes serve as support for the sacrum (cf. for example the seat "Iris” of at vanden BerghePauvers).
• Certain seat backs consist of the superposition of slats of variable dimensions and more or less spaced apart; one of these slats can possibly give an Orientglobal to the pelvis, for example on the EIPS and / or on the sacrum (cf. for example a dining room chair model NR120 from van den Berghe-Pauvers).
• the bearing surface possibly available at the level of the pelvis includes, in the best cases, the EIPS and / or the sacrum, with the drawbacks already mentioned in 1) and 3).
• Some backrests include a crest that is strongly lowered in a V-shape to support the sacrum, and that projects forward at the tip of this V, distant from the adjacent area lowered from the seat surface by about 18 cm ( see Belgian patent n ° 709164).
• Such a type of support is therefore intended to support the sacrum in the writing position (leaning forward), and the "... area of the spine which corresponds to the kidneys and (in) that corresponding to the lower part thorax ... "in the upright sitting position (called” attention position "in the text of the specification of this patent).
• this support at the sacroiliac joint is therefore carried out on all the pelvic bones, that is to say simultaneously on the posterior edge of the two iliac bones (in point 3 of Figures 1, 2 and 3 , below EIPS, point 6) and on the sacrum (at point 4 in Figures 2 and 3, above the most posterior point of the posterior surface of the sacrum, point 7 in Figures 1, 2 and 3).
• the advantage of this support therefore lies mainly in its effectiveness in opposing the retroversion of the pelvis in a seated position while avoiding the risks mentioned above, thus optimally helping to stabilize the pelvis on which the spine and trunk can therefore lean with ease.
• This posterior support thus contributes to avoiding the fatigue linked to a prolonged sitting position by reducing as much as possible the tensions necessary to maintain the trunk in a correct position.
• Such a type of support is made possible by the use of a seat provided, according to the invention, with a posterior support device of suitable shape and consistency, placed on the front face of the backrest or secured to amounts which support it.
• This device is located at a height relative to the seat base allowing it to contact the pelvic area described above (at the sacroiliac joint) in a position close to the so-called “sthenic" sitting position, that is to say the right pelvis and the straightened trunk.
• the production of seats provided with a device according to the invention also includes the possibility of adapting the non-standard shapes and dimensions.
• the support device in question can therefore protrude in relation to a file allowing more general support or with respect to a support frame if it is the only posterior support available or if it is isolated. It can also be inserted between two uprights, whether it is alone or associated with a complementary support whatever it is in so far as it meets the criteria according to the invention.
• a removable support system of variable height can be provided. Such a system can be fixed in any way to one of the parts of a seat which therefore meets the requirements ters established for the present invention.
• a device according to the invention must stand out sufficiently or be sufficiently isolated from the rest of the posterior support (if it exists) to allow the directly overlying parts (EIPS) and underlying (sacrum) to the support area, to take place freely above and below the device, and thus give rise to the use of the latter.
• the rest of the seat must therefore allow the use of the device.
• this backrest cannot exceed forwards the anatomical relief of the back in position so-called “sthenic" seat to allow maximum support on the device.
• the rest of the file will therefore be molded on the back of the user.
• the invented device If the invented device emerges correctly, it must also have a functional form allowing it to best fit the area of the skeleton of the pelvis at the sacroiliac joint by penetrating this point of its posterior relief.
• a posterior support device therefore comprises three support zones: two lateral zones and a central zone set back with respect to the first two. These three areas are rounded forward and intended to support the two iliac bones laterally (below the PIE) and the sacrum in the middle (above the most posterior point of its posterior surface).
• the three support zones of such a device stand out over a height of about 30 mm to give minimum support (allowing an optimal approach to the sacro joint iliac), and sufficient nevertheless given the importance of the pressure of the pelvis on the device at this level.
• a global curvature towards the front of a device meeting these criteria, and the alignment of the three zones on a horizontal plane an example is obtained where these three zones are in the same extension, in the form of a strip ( Figure 4 point 2) can be arranged at the location of a folder described above (at the sacroiliac joint).
• the consistency of the device is such that it can serve as a support for the entire trunk even if it is isolated, without however risking causing tissue damage covering the skeleton of this area of the pelvis.
• Figure 1 shows a side view of the skeleton of a vertical pelvis and a vertical partial sectional view along line IV-IV of Figure 4 of a rear support device of a seat according to the invention.
• FIG. 2 represents a rear view of the skeleton of a vertical pelvis with, in hatched form, the area of this relief intended to rest on a device according to the invention.
• 3 shows a schematic view in vertical section along the line IV-IV of Figure 4 of a seat according to the invention, a sacrum and a lumbar spine being shown in side view with in the background an iliac bone left.
• FIG. 4 represents the diagram of a seat seen from above, provided with a device according to the invention.
• FIG. 1 we can see the front face 5 rounded towards the front of a support device 2 according to the invention.
• This support device 2 is here seen in postero-anterior vertical section at its point of application on the posterior edge of the iliac bone. As this drawing shows, this anterior face 5 is therefore intended to support the posterior edge of the iliac bone below the EIPS 6 according to the invention.
• the dotted line in this FIG. 1 makes it possible to locate the sacroiliac joint 8 which is not visible in a side view, zone 8 at the height of which a support device 2 according to the invention applies.
• FIG. 3 represents a seat shown diagrammatically in vertical section along line IV-IV of FIG. 4, seat whose backrest 1 allows the natural physiological arrangement of the trunk, as in this drawing, favored by the application, on the anterior face of this file 1, of a support device 2 according to the invention.
• the support given by such a support device alone being sufficient, the rest of the file can be deleted, except for the part which serves to support this device.
• the support device 2 Given the level of the section, in FIG. 3, of the support device 2, the latter is applied here by its anterior face 5 (at the midpoint 5a in FIG. 4) on the posterior face of the sacrum. point 4. This point 4 is located above the most posterior point 7 of the posterior aspect of the sacrum.
• the support device 2 is located on the backrest 1 at the height of the sacroiliac joint 8 of the pelvis arranged vertically as allows a seat according to the invention.
• the height of the support device 2 relative to the seat 9 of such a seat is therefore equivalent to the vertical distance between the rear support points 3 and 4 and the horizontal plane comprising the support area 10 of the ischia.
• This FIG. 3 also shows the rounded shape towards the front of the front face 5 of a support device 2, as well as the depth of such a device according to the invention to allow its use.
• Figure 4 we can see in elevation a support device 2 according to the invention associated with a seat whose seat is shown schematically at 9. It is important to note here that the functional form of the device 2 drawn in this figure 4 is not the only one which corresponds to the characteristics included in the claims given following the description of such a device.
• the front face 5 of this device 2 is curved forward so as to determine in particular two levels of support depth 5a and 5b: the midpoint 5a of this front face 5 intended to support the sacrum determines a recessed support depth (about 15 mm if the three support points are on the same horizontal plane) relative to the depth level of the lateral points 5b intended to support the iliac bones, these points 5b being symmetrical with respect to the plane of symmetry passing through 5a, and equidistant from this point 5a of the average distance which separates the posterior crest of the sacrum from a vertical pelvis from the posterior edge of an iliac bone of this pelvis at the level of l 'sacroiliac joint (point 8 in Figures 1 and 3), in accordance with the present description of a support device 2 according to the invention.
• the average quantified measurements corresponding to these dimensions on the basis of anatomical landmarks are given below.
• FIG. 4 also makes it possible to observe one of the possible embodiments of a seat provided with a support device 2 according to the invention: this device is here secured to two uprights 11 which serve to support it.
• this device is here secured to two uprights 11 which serve to support it.
• the support effect of the device described in this thesis therefore ideally applies in depth at the sacroiliac joint on the posterior relief of the pelvis above the most posterior point of the posterior aspect of the sacrum with regard to the support of the sacrum, and on the posterior edges of the iliac bones below the PSI of a pelvis seen in profile in vertical position.
• Such a support device makes it possible to approach as much as possible the optimal point of application for posterior support: the hinge between the iliac bones and the sacrum, lower end of the spine.
• this vertical height or thickness is approximately 30 mm plus or minus 10 mm;
• a width of the support device greater than the distance which separates the two posterior edges of the iliac bones at the height of the support recommended for the invention, that is to say at the level of the sacroiliac joint; this distance, therefore equal to that which separates the two lateral zones of the support device in question, is approximate 180 mm;
• a system for adjusting the height and depth of the central support zone with respect to the two lateral support zones can be provided in order to to adapt the support device to certain particular conformations of basins. Since this adjustment is rarely necessary, a standard device of fixed shape and simple construction is preferably proposed in the present description.
• a support device of this type is shown in 2 seen from above in FIG. 4, this device having the three support zones in the same extension and the middle zone set back with respect to the two lateral zones of approximately 15 mm.
• the device as posterior support secured to a seat is therefore, at the midpoint of its vertical thickness, vertically distant from the plane of the seat (taking into account the crushing of a possible padding) of a height equal to the vertical distance which separates the horizontal plane including the ischia of the support zone described above (at the sacroiliac joint of a pelvis in vertical position). This distance is worth approximately 125 to 175 mm.
• this support device On the front face of an adequate backrest according to the present descrip tion or secure it to a support frame, at an average height such that any user can dispose of it, that is to say so that the support points of the device according to the invention can come into contact with the pelvis of the user at the sacroiliac joint as it is recommended in this thesis.
• This average height is approximately 150 mm from the support plane of the ischia.
• a height adjustment system for a device according to the invention making it possible to adapt this device to the dimensions of the user's pelvis arranged vertically on the seat cushion.
• Such an adjustment system makes it possible to produce adjustable standard office or work seats.
• a system for adjusting the depth of a support device according to the invention can be provided.
• the present invention as posterior support of the pelvis in the sitting position, therefore gives effective support to the user and thus stabilizes the base of his spine.
• This allows the trunk to be kept in a correct sitting position with a minimum of tension in the back muscles without risking damage to the joints of the spine and pelvis.

Landscapes

• Orthopedics, Nursing, And Contraception (AREA)
• Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
• Chair Legs, Seat Parts, And Backrests (AREA)
• Fats And Perfumes (AREA)
• Acyclic And Carbocyclic Compounds In Medicinal Compositions (AREA)

Priority Applications (2)

Applications Claiming Priority (2)

Publications (1)

Family

ID=3862204

Family Applications (1)

Country Status (6)

Cited By (3)

Families Citing this family (2)

Citations (4)

• 1983
  • 1983-06-10 BE BE0/210983A patent/BE897027A/fr not_active IP Right Cessation
• 1984
  • 1984-06-08 AT AT84902435T patent/ATE61917T1/de not_active IP Right Cessation
  • 1984-06-08 AU AU30675/84A patent/AU3067584A/en not_active Abandoned
  • 1984-06-08 EP EP84870076A patent/EP0130169A1/de not_active Withdrawn
  • 1984-06-08 WO PCT/BE1984/000015 patent/WO1984004873A1/fr active IP Right Grant
  • 1984-06-08 EP EP84902435A patent/EP0145762B1/de not_active Expired - Lifetime
  • 1984-06-08 DE DE8484902435T patent/DE3484344D1/de not_active Expired - Fee Related

Patent Citations (4)

Also Published As

Similar Documents

Legal Events