CA2699558A1 - Back extension backrest - Google Patents
Back extension backrest Download PDFInfo
- Publication number
- CA2699558A1 CA2699558A1 CA2699558A CA2699558A CA2699558A1 CA 2699558 A1 CA2699558 A1 CA 2699558A1 CA 2699558 A CA2699558 A CA 2699558A CA 2699558 A CA2699558 A CA 2699558A CA 2699558 A1 CA2699558 A1 CA 2699558A1
- Authority
- CA
- Canada
- Prior art keywords
- backrest
- lower member
- spring
- upper member
- hinge mechanism
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
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
-
- 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
- A47C7/405—Support for the head or the back for the back with double backrests
Landscapes
- Chair Legs, Seat Parts, And Backrests (AREA)
- Chairs For Special Purposes, Such As Reclining Chairs (AREA)
Abstract
A backrest for use with a chair that has a seat and a base. The backrest includes a lower member having a proximal end and a distal end, and upper member attached to the chair at the proximal end. A spring-hinge mechanism pivotally connects the lower member in the vicinity of the distal end to the upper member. A lumbar support is attached to the upper member and the lower member and spans the spring-hinge mechanism. In use a user sitting on the seat may, by anterior flexing of the user's upper back cause the upper member to pivot relative to the lower member from an unflexed position to a flexed position.
Description
BACK EXTENSION BACKREST
Field of the Invention [0001] The present invention relates to backrests for chairs and more particularly to office-chair backrests intended to alleviate back problems associated with prolonged sitting in conventional office chairs.
Background of the Invention [0002] Back problems and associated back pain are widespread. One half of all working Canadians admit to having back or neck pain symptoms each year. Back pain is the second most common reason for missed work and visits to the doctors' offices. Most cases of back pain are mechanical or non-organic, meaning they are not caused by underlying medical conditions, such as inflammatory arthritis, infection, fracture or cancer. Canadians spend billions each year on neck or back pain. Experts estimate that as much as 80% of the population will experience a back problem at some time in their lives.
Field of the Invention [0001] The present invention relates to backrests for chairs and more particularly to office-chair backrests intended to alleviate back problems associated with prolonged sitting in conventional office chairs.
Background of the Invention [0002] Back problems and associated back pain are widespread. One half of all working Canadians admit to having back or neck pain symptoms each year. Back pain is the second most common reason for missed work and visits to the doctors' offices. Most cases of back pain are mechanical or non-organic, meaning they are not caused by underlying medical conditions, such as inflammatory arthritis, infection, fracture or cancer. Canadians spend billions each year on neck or back pain. Experts estimate that as much as 80% of the population will experience a back problem at some time in their lives.
[0003] The ubiquity of computerized work stations has caused an epidemic of neck, mid-back, and low-back pain, and headaches. The human body was not designed to sit all day. In adults, spinal discs in your spine have no blood supply; studies show that around 12-14 years of age, the blood supply to the discs atrophies. That means there is no direct circulation going through a disc.
There is blood supply outside the discs in people of all ages. This blood supply must be forced into the disc to prevent disc damage and allow healing to occur.
Since there is no direct blood supply into a disc, the only way to get nutrition and oxygen into a disc and waste products out is by imbibition, which is augmented by movement of the spine.
Page 1 of 10 [0004] Research has indicated that the movement adequate to force blood flow in and waste products out must be performed twice daily to maintain healthy hydrated spinal discs, ligaments and tendons. It has been found that it takes up to 500 days to force blood flow in and waste products out in those patients who are sedentary and don't or can't do the correct types of motion necessary to cause the desired exchange.
There is blood supply outside the discs in people of all ages. This blood supply must be forced into the disc to prevent disc damage and allow healing to occur.
Since there is no direct blood supply into a disc, the only way to get nutrition and oxygen into a disc and waste products out is by imbibition, which is augmented by movement of the spine.
Page 1 of 10 [0004] Research has indicated that the movement adequate to force blood flow in and waste products out must be performed twice daily to maintain healthy hydrated spinal discs, ligaments and tendons. It has been found that it takes up to 500 days to force blood flow in and waste products out in those patients who are sedentary and don't or can't do the correct types of motion necessary to cause the desired exchange.
[0005] As well, sitting for extended periods in the average office chair often results in a forward-slouching posture, as such chairs tend to motivate and guide poor posture with forward head posture and a collapsed or reversed lumbar curve. This position puts strain upon the lower back.
Summary of the Invention [0006] In one aspect, the invention consists of a backrest for use with a chair having a seat and a base, the backrest including: a lower member having a proximal end and a distal end, and attached to the chair at the proximal end;
an upper member; a spring-hinge mechanism pivotally connecting the lower member in the vicinity of the distal end to the upper member; a lumbar support attached to the upper member and the lower member and spanning the spring-hinge mechanism wherein, in use a user sitting on the seat may, by anterior flexing of the user's upper back cause the upper member to pivot relative to the lower member from an unflexed position to a flexed position.
Summary of the Invention [0006] In one aspect, the invention consists of a backrest for use with a chair having a seat and a base, the backrest including: a lower member having a proximal end and a distal end, and attached to the chair at the proximal end;
an upper member; a spring-hinge mechanism pivotally connecting the lower member in the vicinity of the distal end to the upper member; a lumbar support attached to the upper member and the lower member and spanning the spring-hinge mechanism wherein, in use a user sitting on the seat may, by anterior flexing of the user's upper back cause the upper member to pivot relative to the lower member from an unflexed position to a flexed position.
[0007] The backrest has three main purposes: to correct the posture of the one who is sitting; to strengthen the internal muscles associated with spinal support; and to increase circulation up and down the entire spine. This is done by means of the rearward (or anterior) flexing of the upper body while sitting.
Page 2 of 10 The backrest flexes, or hinges, from a point midway up the lumbar curve. The backrest foam and fabric cover are not split, but they flex in order to accommodate the motion. The hinged portions of the backrest are spring-loaded, so that they return to the neutral or starting position.
Page 2 of 10 The backrest flexes, or hinges, from a point midway up the lumbar curve. The backrest foam and fabric cover are not split, but they flex in order to accommodate the motion. The hinged portions of the backrest are spring-loaded, so that they return to the neutral or starting position.
[0008] In order to use the backrest, the sitter engages his or her spine with the backrest lumbar support, and flexes backwards several times.
[0009] Possible variations involve moving the hinging point higher or lower, making the spring resistance variable, providing a height-adjustable headrest, providing an adjustable tilt for the upper portion of the backrest.
Summary of the Drawings [0010] Figure 1 is a side elevation view of an embodiment of the invention shown unflexed.
Summary of the Drawings [0010] Figure 1 is a side elevation view of an embodiment of the invention shown unflexed.
[0011] Figure 2 is a perspective cut away view of the backrest shown in Figure 1, shown unflexed.
[0012] Figure 3 is a perspective cut away view of the backrest shown in Figure 2, shown flexed.
[0013] Figure 4 is a side elevation view of the backrest shown in Figure 2, shown unflexed.
[0014] Figure 5 is a side elevation view of the backrest shown in Figure 4, shown flexed.
Page 3 of 10 [0015] Figure 6 is a side elevation view of a variation on the embodiment illustrated in Figure 1 which includes an upper-back roller.
Detailed Description with Reference to the Drawings [0016] Figures 1 through 5 show a backrest 10 embodiment of the present invention as a feature of an otherwise-conventional stylized office chair 12 having a seat 14 and base 16. Figure 6 illustrates a variation of the embodiment illustrated in Figures 1 through 5.
Page 3 of 10 [0015] Figure 6 is a side elevation view of a variation on the embodiment illustrated in Figure 1 which includes an upper-back roller.
Detailed Description with Reference to the Drawings [0016] Figures 1 through 5 show a backrest 10 embodiment of the present invention as a feature of an otherwise-conventional stylized office chair 12 having a seat 14 and base 16. Figure 6 illustrates a variation of the embodiment illustrated in Figures 1 through 5.
[0017] Referring to Figure 1, the backrest 10 includes a lower member 18 and an upper member 20, attached one to the other by a spring-hinge mechanism 22. Spanning the lower member 18 and upper member 20, and projecting away from the spring-hinge mechanism 22 towards the front of the office chair 12 there is a padded lumbar support 24.
[0018] The spring-hinge mechanism 22 is configured to permit the lower member 18 and upper member 20 to pivot relative to each other between an upright, essentially aligned, unflexed position, as shown in Figures 1 and 2, and a flexed position, an example of which is shown in Figure 5. The spring-hinge mechanism 22 is configured to resiliently bias the lower member 18 and upper member 20 into the unflexed position, such that a user of the office chair 12 experiences some resistance when moving from the unflexed position illustrated in Figure 4 to the flexed position illustrated in Figure 5 and the backrest 20 will not remain in the flexed position unless a suitable force is maintained.
Preferably, the spring-hinge mechanism 22 is configured, or other features of the backrest 10 are configured, to limit the range of movement of the upper member 20 relative to the lower member 18, such that the pivot angle between Page 4 of 10 the unflexed position illustrated in Figure 4 and the normal maximum flexed position illustrated in Figure 5 is about 30 degrees.
Preferably, the spring-hinge mechanism 22 is configured, or other features of the backrest 10 are configured, to limit the range of movement of the upper member 20 relative to the lower member 18, such that the pivot angle between Page 4 of 10 the unflexed position illustrated in Figure 4 and the normal maximum flexed position illustrated in Figure 5 is about 30 degrees.
[0019] Referring to Figure 4, the spring-hinge mechanism 22 may be configured, or other features of the backrest 10 may be configured to permit adjustment of the alignment of the lower member 18 and upper member 20 when in the unflexed position and to permit adjustment of the range of movement between the unflexed position and the normal maximum flexed position illustrated in Figure 5.
[0020] The lumbar support 24 deforms to accommodate the pivoting of the lower member 18 and upper member 20 between the unflexed position illustrated in Figure 4 and flexed position illustrated in Figure 5.
Preferably the lumbar support 14 has a suitable unsegmented surface configured to accommodate the pivoting of the lower member 18 and upper member 20, and the associated deformation of the lumbar support 24, without resorting to openings that might tend to undesirably interact with the users clothing when the backrest 10 is moved between the flexed and unflexed positions illustrated in Figures 4 and 5.
Preferably the lumbar support 14 has a suitable unsegmented surface configured to accommodate the pivoting of the lower member 18 and upper member 20, and the associated deformation of the lumbar support 24, without resorting to openings that might tend to undesirably interact with the users clothing when the backrest 10 is moved between the flexed and unflexed positions illustrated in Figures 4 and 5.
[0021] In order to use the backrest 10, the user engages his or her back with the lumbar support 24, and by applying a force by means of a rearward (or anterior) flexing of his or her upper body, moves the backrest 10 from the unflexed position illustrated in Figure 4 to the flexed position illustrated in Figure 5. Used in this way, the backrest 10 assists to correct the posture of the one who is sitting, strengthen the internal muscles associated with spinal support and to increase circulation up and down the entire spine.
Page 5 of 10 [0022] The backrest 10 is intended to provide benefits by way of facilitating desired motion rather than by strength training per se, and thus the resistance to the movement between the unflexed position illustrated in Figure 4 and the flexed position illustrated in Figure 5 provided by the backrest 20 is preferably relatively minimal. Preferably, the resistance is adjustable.
Page 5 of 10 [0022] The backrest 10 is intended to provide benefits by way of facilitating desired motion rather than by strength training per se, and thus the resistance to the movement between the unflexed position illustrated in Figure 4 and the flexed position illustrated in Figure 5 provided by the backrest 20 is preferably relatively minimal. Preferably, the resistance is adjustable.
[0023] The backrest 10 is preferably configured to permit adjustment of the location of the lumbar support 24 relative to the seat 14. The backrest 10 is preferably configured so as to permit vertical adjustment of the location of the pivot axis relative to the seat 14 and lumbar support 24. The backrest 10 is preferably attached to the seat 14 and base 16 in such a way as to permit adjustment of the tilt of the backrest 10 relative to the seat 14 and base 16.
Variations [0024] Referring to Figure 6, there is illustrated a variation of the backrest 10 which includes a height adjustable headrest or an upper-back roller 26 which is provided in the vicinity of the upper end of the upper member 20. In the illustrated embodiment, the upper-back roller 26 is rotatably attached to the upper member 20 so as to rotate about a generally horizontal axis. The upper-back roller 26 preferably has a padded or resiliently flexible surface 28 for user comfort.
The upper-back roller 26 shown in the drawings is generally cylindrical, but other configurations may also be suitable, such as spherical, combined conical, ridged, irregular etc. Upper-back roller 26 rolls during the flexing to prevent rubbing with the spine, and to help massage the upper back muscles.
Page 6 of 10 [0025] In order to use the backrest 10 with upper-back roller 26, the user engages his or her back with the lumbar support 24, and by applying a force to the upper-back roller 26 by means of a rearward (or anterior) flexing of the upper body, moves the backrest 10 between the unflexed position illustrated in Figure 4 and flexed position illustrated in Figure 5, preferably several times.
The upper-back roller 26 rolls during such flexing, which tends to reduce frictional resistance to the flexing and to have a massaging effect along the user's upper spine. Used in this way, the backrest 10 assists to: correct the posture of the one who is sitting; to strengthen the internal muscles associated with spinal support; and to increase circulation up and down the entire spine.
The upper-back roller 26 is preferably positioned so that it will be adjacent the users upper thoracic vertebrae (T1- T7) in the unflexed position and when moving between the unflexed position and the flexed position illustrated in Figures 4 and 5. Since this is a common area for the accumulation of sitting-related stress, the rolling action has a desirable ancillary massage effect.
Some who have tried the backrest 10 have expressed a desire to have the roller extend in to the cervical area, up to and including C1. Since the amount of force required to flex the backrest 10 is minimal, it is understood that there should be no spinal problems associated with this upper limit of roller extension. The range of travel of the upper-back roller along the user's back and the resistance to the movement between the unflexed position and the flexed position illustrated in Figure 4 and 5 provided by the backrest 20, may be determined by user comfort.
Page 7 of 10
Variations [0024] Referring to Figure 6, there is illustrated a variation of the backrest 10 which includes a height adjustable headrest or an upper-back roller 26 which is provided in the vicinity of the upper end of the upper member 20. In the illustrated embodiment, the upper-back roller 26 is rotatably attached to the upper member 20 so as to rotate about a generally horizontal axis. The upper-back roller 26 preferably has a padded or resiliently flexible surface 28 for user comfort.
The upper-back roller 26 shown in the drawings is generally cylindrical, but other configurations may also be suitable, such as spherical, combined conical, ridged, irregular etc. Upper-back roller 26 rolls during the flexing to prevent rubbing with the spine, and to help massage the upper back muscles.
Page 6 of 10 [0025] In order to use the backrest 10 with upper-back roller 26, the user engages his or her back with the lumbar support 24, and by applying a force to the upper-back roller 26 by means of a rearward (or anterior) flexing of the upper body, moves the backrest 10 between the unflexed position illustrated in Figure 4 and flexed position illustrated in Figure 5, preferably several times.
The upper-back roller 26 rolls during such flexing, which tends to reduce frictional resistance to the flexing and to have a massaging effect along the user's upper spine. Used in this way, the backrest 10 assists to: correct the posture of the one who is sitting; to strengthen the internal muscles associated with spinal support; and to increase circulation up and down the entire spine.
The upper-back roller 26 is preferably positioned so that it will be adjacent the users upper thoracic vertebrae (T1- T7) in the unflexed position and when moving between the unflexed position and the flexed position illustrated in Figures 4 and 5. Since this is a common area for the accumulation of sitting-related stress, the rolling action has a desirable ancillary massage effect.
Some who have tried the backrest 10 have expressed a desire to have the roller extend in to the cervical area, up to and including C1. Since the amount of force required to flex the backrest 10 is minimal, it is understood that there should be no spinal problems associated with this upper limit of roller extension. The range of travel of the upper-back roller along the user's back and the resistance to the movement between the unflexed position and the flexed position illustrated in Figure 4 and 5 provided by the backrest 20, may be determined by user comfort.
Page 7 of 10
Claims (3)
1. A backrest for use with a chair having a seat and a base, the backrest comprising:
a) a lower member having a proximal end and a distal end, and attached to the chair at the proximal end;
b) an upper member;
c) a spring-hinge mechanism pivotally connecting the lower member in the vicinity of the distal end to the upper member; and d) a lumbar support attached to the upper member and the lower member and spanning the spring-hinge mechanism wherein, in use a user sitting on the seat may, by anterior flexing of the user's upper back cause the upper member to pivot relative to the lower member from an unflexed position to a flexed position.
a) a lower member having a proximal end and a distal end, and attached to the chair at the proximal end;
b) an upper member;
c) a spring-hinge mechanism pivotally connecting the lower member in the vicinity of the distal end to the upper member; and d) a lumbar support attached to the upper member and the lower member and spanning the spring-hinge mechanism wherein, in use a user sitting on the seat may, by anterior flexing of the user's upper back cause the upper member to pivot relative to the lower member from an unflexed position to a flexed position.
2. The backrest as defined in claim 1, wherein an upper-back roller is attached to the upper member distal from the spring-hinge mechanism.
3. A backrest for use with a chair having a seat and a base, the backrest comprising:
a) a lower member having a proximal end and a distal end, and attached to the chair at the proximal end;
b) an upper member;
c) a spring-hinge mechanism pivotally connecting the lower member in the vicinity of the distal end to the upper member;
d) a lumbar support attached to the upper member and the lower member and spanning the spring-hinge mechanism; and c) an upper-back roller attached to the upper member distal from the spring-hinge mechanism;
wherein, in use a user sitting on the seat may, by anterior flexing of the user's upper back cause the upper member to pivot relative to the lower member from an unflexed position to a flexed position.
a) a lower member having a proximal end and a distal end, and attached to the chair at the proximal end;
b) an upper member;
c) a spring-hinge mechanism pivotally connecting the lower member in the vicinity of the distal end to the upper member;
d) a lumbar support attached to the upper member and the lower member and spanning the spring-hinge mechanism; and c) an upper-back roller attached to the upper member distal from the spring-hinge mechanism;
wherein, in use a user sitting on the seat may, by anterior flexing of the user's upper back cause the upper member to pivot relative to the lower member from an unflexed position to a flexed position.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US17003609P | 2009-04-16 | 2009-04-16 | |
| US61/170,036 | 2009-04-16 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2699558A1 true CA2699558A1 (en) | 2010-10-16 |
Family
ID=42979742
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2699558A Abandoned CA2699558A1 (en) | 2009-04-16 | 2010-04-15 | Back extension backrest |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US20100264709A1 (en) |
| CA (1) | CA2699558A1 (en) |
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| DE3361727D1 (en) * | 1982-10-22 | 1986-02-13 | Castelli Spa | Chair having a back comprising a plurality of articulated segments |
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-
2010
- 2010-04-15 US US12/761,291 patent/US20100264709A1/en not_active Abandoned
- 2010-04-15 CA CA2699558A patent/CA2699558A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| US20100264709A1 (en) | 2010-10-21 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |
Effective date: 20130415 |