for the following defined terms , these definitions shall be applied , unless a different definition is given in the claims or elsewhere in this specification . all numeric values are herein assumed to be modified by the term “ about ”, whether or not explicitly indicated . the term “ about ” generally refers to a range of numbers that one of skill in the art would consider equivalent to the recited value ( i . e ., having the same function or result ). in many instances , the term “ about ” may be indicative as including numbers that are rounded to the nearest significant figure . the recitation of numerical ranges by endpoints includes all numbers within that range ( e . g ., 1 to 5 includes 1 , 1 . 5 , 2 , 2 . 75 , 3 , 3 . 80 , 4 , and 5 ). although some suitable dimensions ranges and / or values pertaining to various components , features and / or specifications are disclosed , one of skill in the art , incited by the present disclosure , would understand desired dimensions , ranges and / or values may deviate from those expressly disclosed . as used in this specification and the appended claims , the singular forms “ a ”, “ an ”, and “ the ” include plural referents unless the content clearly dictates otherwise . as used in this specification and the appended claims , the term “ or ” is generally employed in its sense including “ and / or ” unless the content clearly dictates otherwise . the following detailed description should be read with reference to the drawings in which similar elements in different drawings are numbered the same . the detailed description and the drawings , which are not necessarily to scale , depict illustrative embodiments and are not intended to limit the scope of the invention . the illustrative embodiments depicted are intended only as exemplary . selected features of any illustrative embodiment may be incorporated into an additional embodiment unless clearly stated to the contrary . referring now to fig1 - 8 , an adjustable task chair 10 is shown from various perspectives as described above . fig1 , 3 , 5 , 7 and 8 illustrate the chair in a first position , which is the position that the chair 10 will generally assume when empty . fig2 , 4 and 6 illustrate the chair in a second position , which is a position the chair may assume when someone is sitting in the chair ( the user is not illustrated ). the reference directions used herein will be from the perspective of one sitting in the chair as it is intended to be sat in . it is from this perspective that terms such as front , rear , left , right , raise , lower , up , down and the like should be understood . the chair 10 includes a seat 12 that extends generally laterally , a back brace 14 and one or more knee braces 16 and 18 . while embodiments are contemplated where a single knee brace extends across the front to accommodate a pair of knees , the embodiment illustrated includes a left knee brace 16 and a right knee brace 18 . the back brace may be integrated into a back 20 . the back 20 does not move with the back brace from the first position to the second position and thus , during seating , is fixed with respect to seat 10 . back 20 , nevertheless , may be other adjustable with respect to seat 12 to accommodate particular users and particular adjustments to the back brace 14 . back 20 may include an upper back portion 22 and an lower back portion 24 where the back brace 14 is disposed between the upper and lower back portions as illustrated . in some embodiments , a button or lever is included that can be operated to lock the chair into the first position or , in other embodiments , into any desired position so that the chair may be used as a typical task chair . back brace 14 is attached to the rest of chair 10 through one or more back brace struts 32 . in the embodiment illustrated , two back brace struts 32 are illustrated which are disposed symmetrically about a plane between the left and right halves of the chair . it can be appreciated , however , that other configurations for attaching the back brace to the rest of chair 10 using one or more back brace struts are possible . for example , a single back brace strut 32 may be disposed along the plane described above . back brace 14 may be pivotably connected to back brace struts 32 and may be biased by springs or another mechanism ( not shown ) to a default position . back brace struts 32 may also include a telescoping portion ( not shown ) to allow a user to raise or lower the back brace 14 to a desired height . left and right knee braces 16 and 18 are connected to the rest of the chair 10 using left and right knee brace struts 34 and 36 , respectively . each strut may include a hinge to allow the left and right knee braces to swing out to provide easier access to the seat as illustrated in fig7 and 8 . hinge 46 in right knee brace strut 36 may be seen in several of the views . hinge 46 may include one or more detents to fix the struts in certain desired positions . for example , one detent may fix the struts in the position shown in fig7 and , in other embodiments , another detent may fix the struts in the position shown in fig8 . an appropriate degree of lateral force may allow a user to over the force of the detent to move the struts between positions . left and right knee braces may also include telescoping portions ( not shown ) to allow a user to lengthen or shorten the struts to accommodate a particular user . a chair base 26 may include wheels 28 and may be of any suitable configuration . for example , the chair base 26 illustrated includes five wheels 28 on arms extending radially out from a central hub . on top of chair base 26 is a platform 30 , which may be seen in fig3 , 4 , 7 and 8 . platform 30 may be connected to chair base 26 with a hydraulic cylinder 48 or other suitable mechanism for adjusting the height of the seat 12 and other portions of the chair above the cylinder by the use of a lever ( not shown ). struts 32 , 34 and 36 may be connected to the chair and the platform in the following manner . as can be seen , for example , in fig3 , back brace struts 32 curve or bend around the bottom of seat 12 and are attached to seat 12 near the front of the seat . the connections between back brace struts 32 and seat 12 allow for lateral movement in a front to back direction and pivoting about an axis extending parallel to the front of the seat 12 . when the chair is in the first position , the back brace struts are towards the rear of their lateral freedom of movement in the connection . as can be better send in fig7 , the back brace struts 32 are attached to the platform 30 in the front portion of platform 30 . element 50 is a hinge that allows pivoting of the back brace struts with respect to platform 30 . element 50 may be a simple hinge or may be a hinge biased to keep back brace 14 in the first position . element 50 may be biased by the inclusion of a spring or hydraulic element as desired . in some embodiments , an additional biasing element is not needed to move the chair into the first position . the back brace 14 and the back brace struts 32 are substantially to the rear of the pivot connection with the platform 30 . likewise , the knee braces and the knee brace struts are substantially to the front of their pivot connections with platform 30 . the weight of the configuration , therefore , may be sufficient to move the chair to the first position when empty . knee brace struts 34 and 36 similarly curve or bend around the bottom of seat 12 to connect to the rear of seat 12 as shown in fig3 . the connections between struts 34 and 36 and seat 12 allows for lateral movement in a front to back direction and pivoting about an axis extending parallel to the rear of the seat 12 . when the chair is in the first position , the knee brace struts are towards the front of their lateral freedom of movement in the connection . knee brace struts are pivotably connected to the rear of platform 30 at joints 52 as can be best seen in fig8 . the chair 10 may also include armrests 54 , which may be adjustable to fit the user , and which may be attached to the seat as illustrated . the chair may be manufactured in any desired manner as is known in the art . for example , the chair may include fabrics , meshes , foam , batting , metal and polymer parts as appropriate and desired and may be fabricated using any conventional manufacturing techniques . in use , a user may open the knee brace struts 34 and 36 as illustrated in fig8 and move so the back of the knees are near the front edge of the seat 12 . the user may then close the knee brace struts 34 and 36 to the position shown in fig7 and sit in the chair . the weight of the user will cause both the back brace 14 and the knee braces 16 and 18 to rotate inward towards the user . the back brace will contact the user &# 39 ; s back and the knee braces will contact the users knees and urge the user into an erect sitting position , where pressure from the back brace and the knee braces will support the user in the erect sitting position . those skilled in the art will recognize that the present invention may be manifested in a variety of forms other than the specific embodiments described and contemplated herein . accordingly , departure in form and detail may be made without departing from the scope and spirit of the present invention as described in the appended claims .
an ergonomic task chair having a front and a rear , including a laterally extending seat having a front and a rear , a back brace disposed above the rear of the seat , and a knee support disposed in the front of the chair , wherein the back brace and the knee support have a first position where there is a first minimum distance between the back brace and the knee support and a second position where there is a second minimum distance between the back brace and the knee support , the second minimum distance being less than the first minimum distance , wherein movement from the first minimum distance to the second minimum distance is triggered by a downward movement of the seat .