Keyboard support assembly
An articulated support assembly for a computer keyboard. The assembly includes a platform for supporting a computer keyboard. A parallelogram linkage pivotally interconnects the platform assembly to an attachment member secured to a support surface. A releasable retaining means prevents movement of the platform toward a lowered position relative to the support surface. Pivotal movement of the platform alters the distance between pivot axes of the parallelogram linkage to disengage the retaining means and allow movement of the platform toward either a lowered or a raised position relative to the support surface.
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The present invention relates to articulated support assembly adapted for adjustably supporting a computer keyboard along one edge of a horizontal support member, and particularly to such support assembles that are attached to a bottom surface of the support member.
The art is replete with articulated support assemblies adapted for adjustably supporting a computer keyboard along one edge of a horizontal support member. The various prior art assemblies typically include locking mechanisms to maintain the support assemblies at a desired height. The locking mechanisms include “levered” locking mechanisms in which a lever or handle must be operated to release and re-secure the support assembly, and “leverless” locking mechanisms in which, typically, the keyboard platform itself is manipulated to release and re-secure the support assembly. Existing support assemblies and their associated locking mechanisms often fail to provide the desired combination of stability, adjustability and ease of use desired by the user.
SUMMARYOne aspect of the invention described herein provides an articulated support assembly adapted for adjustably supporting a computer keyboard from a horizontal support surface. In one embodiment according to the invention, the support assembly comprises: an attachment member adapted to be attached to the horizontal support surface; a platform assembly having an upper surface adapted to have a computer keyboard supported thereon, the upper surface having a predetermined orientation with respect to the horizontal support surface; a vertically swingable parallelogram linkage having elongated first and second links each having a first end and a second end, the first ends of the elongated first and second links pivotally interconnected to the platform assembly, and the second ends of the elongated first and second links pivotally interconnected to the attachment member, such that the first and second ends of the first and second links each have a pivot axis, and such that the linkage allows vertical displacement of the platform assembly relative to the support surface while maintaining the predetermined orientation of the upper surface; a releasable retaining means coupling the first link to the attachment member, the releasable retaining means moveable between an engaged position for preventing vertical movement of the platform assembly toward a lowered position relative to the horizontal support surface, and a disengaged position for allowing vertical movement of the platform assembly toward either a lowered or a raised position relative to the horizontal support surface; and means for altering the distance between the pivot axes of the second link, wherein altering the distance between the pivot axes of the second link moves the releasable retaining means between the engaged position and the disengaged position.
In another embodiment according to the invention, the support assembly comprises: an attachment member adapted to be attached to the horizontal support surface; a platform assembly having an upper surface adapted to have a computer keyboard supported thereon; a first support arm adapted for mounting the platform assembly on the attachment member, a first end of the first support arm pivotally mounted to the platform assembly for pivotal movement of the platform assembly about a first platform pivot axis, a second end of the first support arm pivotally mounted to the attachment member for pivotal movement about a first attachment member pivot axis; a second support arm adapted for mounting the platform assembly on the attachment member, a first end of the second support arm pivotally mounted to the platform assembly for pivotal movement of the platform assembly about a second platform pivot axis, a second end of the second support arm pivotally mounted to the attachment member for pivotal movement about a second attachment member pivot axis; wherein the first platform pivot axis, second platform pivot axis, first attachment member pivot axis and second attachment member pivot axis are parallel to each other, and wherein the first and second platform pivot axes, the first and second attachment member pivot axes, and the first and second support arms are positioned to define a parallelogram linkage; and first releasable retaining means between the first support arm and the attachment member, the first releasable retaining means moveable between an engaged position for preventing rotating movement of the first support arm toward a lowered position relative to the attachment member, and a disengaged position for affording rotating movement of the first support arm toward either a lowered or a raised position relative to the attachment member; wherein the first releasable retaining means is moved from the engaged position to the disengaged position by pivotal movement of the platform assembly about the first platform pivot axis.
BRIEF DESCRIPTION OF THE DRAWINGSThe present invention will be further described with reference to the accompanying drawings wherein like reference numerals refer to like parts in the several views, and wherein:
In the following Detailed Description, reference is made to the accompanying drawings which form a part hereof, and in which is shown by way of illustration specific embodiments in which the invention may be practiced. In this regard, directional terminology, such as “top,” “bottom,” “front,” “back,” “leading,” “trailing,” etc., is used with reference to the orientation of the Figure(s) being described. Because components of embodiments of the present invention can be positioned in a number of different orientations, the directional terminology is used for purposes of illustration and is in no way limiting. It is to be understood that other embodiments may be utilized and structural or logical changes may be made without departing from the scope of the present invention. The following detailed description, therefore, is not to be taken in a limiting sense, and the scope of the present invention is defined by the appended claims.
Referring now to
Generally, the articulated support assembly 10 comprises an attachment member 16 adapted to be attached to the bottom mounting surface 14 of the horizontal support member 12 in spaced relationship adjacent its edge 13. Also included is a platform assembly 18 having a generally planar upper surface 20 adapted to have computer keyboard 11 supported thereon. A vertically swingable parallelogram linkage 30 attaches the platform assembly 18 to the attachment member 16, and allows vertical displacement of the platform assembly 18 relative to the bottom mounting surface 14 of the horizontal support member 12 while maintaining a predetermined orientation of the platform assembly upper surface 20 with respect to the horizontal support member 12.
In one embodiment attachment member 16 is coupled to a swivel assembly 32, which is in turn coupled to a track slide bracket 34. Swivel assembly 32 affords pivotal movement about the axis of bolt 36 (seen in
The parallelogram linkage 30 of support assembly 10 is best illustrated in
As best seen in
In the illustrated embodiment, the linkage 30 uses two upper support arms 48a, 48b (collectively upper support arms 48) positioned on opposite sides of lower support arm 50 (seen in
Typically, horizontal support member 12 is a desk or similar work surface, and the bottom mounting surface 14 has a height in the range of approximately 28 to 30 inches above a floor. In one embodiment, upper support arms 48 and lower support arm 50 have lengths sufficient to position upper surface 20 of platform assembly 18 approximately 10 inches or more above mounting surface 14, such that the articulated support assembly 10 may be used by an individual in a standing position.
In one embodiment, the platform assembly 18 includes an upper platform 52 providing planar upper surface 20, and a lower platform mounting plate 54 configured for mounting the platform 52 to the parallelogram linkage 30. In this manner, different platforms 52 (having different sizes, shapes, mouse pads, etc.) may be used with the support assembly 10 and commonly mounted using the platform mounting plate 54. In other embodiments, the upper platform 52 and platform mounting plate 54 may be formed as a single component, or as a combination of more than two components.
By means of an upper support arm mounting bracket 60, platform mounting plate 54 is mounted to a generally U-shaped rigid support member 62. Support member 62 includes an elongate central portion 64 and generally parallel end portions 66 projecting in the same direction from the opposite ends of the central portion 64. The elongate central portion 64 is aligned with first platform pivot axis 40. Upper support arm mounting bracket 60 secures platform mounting plate 54 on the central portion 64 of support member 62 for pivotal movement of the platform assembly 18 about the first platform pivot axis 40, with the upper surface 20 of the platform assembly 18 parallel to the first platform pivot axis 40.
First ends 70 of upper support arms 48a, 48b are adapted for mounting to the end portions 66 of the support member 62, while second ends 72 of upper support arms 48a, 48b are adapted for connection to attachment member 16 for pivotal movement about first attachment member pivot axis 44. Releasable retaining means or ratchet means 80 are provided between the upper support arms 48a, 48b and the attachment member 16. The releasable retaining means or ratchet means 80 are moveable between an engaged position (
In one embodiment, the upper support arms 48a, 48b each comprise two pairs 74 of mating polymeric moldings. First end 70 of each pair 74 of mating polymeric moldings encloses an end of the central portion 64 and one of the end portions 66 of the support member 62. The end portions 66 are attached to support arms 48a, 48b by bolts 82. Second end 72 of each pair 74 of mating polymeric moldings contains ratchet means 80. Engagement of the second ends 72 with the attachment member 16 is maintained by a bolt and washer assembly 82 that extends through openings in the attachment member 16 and in the second end 72.
The releasable retaining means or ratchet means 80 is best seen in
Rocking portion 100 has a guide surface defining a through slot 110 generally at the axis of the cylindrically convex surface 102, and a side surface defining a recess 112 along the side of the rocking portion 100 opposite the straight line between the first attachment member pivot axis 44 and the pivot portion axis 96a. The pivot portion 94 includes a pin 114 that projects through the slot 110 and is adapted to engage the guide surface to carry the rocking portion 100 on the pivot portion 94. Pin 114 further provides a pivot axis for the rocking portion 100, such that when upward movement of the upper support arm 48 relative to the attachment member 16 is initiated, teeth 104 positioned opposite the recess 112 initially remain engaged with teeth on the gear 90, while the teeth 104 that are adjacent the recess 112 pivot out of engagement with the gear 90 around the still engaged teeth 104 opposite the recess 112. The molding 74 has a lug or pin 116 adapted to be engaged by the surface defining the recess 112 when the teeth 104 adjacent the recess 112 pivot out of engagement with the gear 90, and thereby restricting further pivoting of the teeth 104 adjacent the recess 112 away from the gear 90 and causing opposite pivot motion of the rocking portion 100 about the pins 114 and 116 to cause the teeth 104 opposite the recess 112 to separate from the gear 90 during further upward movement of the upper support arm 48 relative to the attachment member 16.
Alternatively, the ratchet means 80 can be moved to the disengaged position by manually pivoting the entirety of pawl assembly 92 to move the pawl assembly 92 out of engagement with gear 90. In particular, a cable 120 in a casing or cable housing 120a (e.g., casings of molybdenum disulfite filled nylon material) is coupled to the pivot portion 94 of the pawl assembly 92. Movement of the cable 120 in the direction of arrow 122 causes the pivot portion 94 to pivot about its axis 96a to move the arcuate surface 98 away from the gear 90 and cause engagement of the pins 114 and 116 with the surfaces defining the slot 110 and the recess 112, thereby retracting the teeth 104 on the rocking portion 100 to a position spaced from the teeth on the gear 90 (
In other embodiments, a slip clutch means is disposed between the gear 90 and the attachment member 16 for affording movement of the upper support arms 48a, 48b and platform assembly 18 toward a lowered position relative to the attachment member 16 in response to application of a downward force on the platform assembly 18 above a predetermined minimum force. A suitable slip clutch means is described in U.S. Pat. No. 5,823,487, incorporated by reference herein.
Referring to
Referring to
Lower support arm 50 includes a bore 136 at its first end 137, the bore 136 defining the second platform pivot axis 42 when attached to platform assembly 18 via lower support arm mounting brackets 132. For attachment of lower support arm 50 to lower support arm mounting brackets 132, tilt bushings 138a, 138b, each having a flange portion 140, a boss portion 142, and an axial through-bore 144 are inserted into bore 136 of lower support arm 50. Boss portions 142 are sized to provide clearance for free rotation of the bushings 138a, 138b within the bore 136 of lower support arm 50, and the total length of boss portions 142 exceeds a length of the bore 136. A tilt angle adjustment bolt 150 is inserted through curved slots 134 of the lower support arm mounting brackets 132 and axial through-bores 144 of tilt bushings 138a, 138b, and secured by a clamp handle 152. When clamp handle 152 is tightened to compress tilt bushings 138a, 138b between lower support arm mounting brackets 132, lower support arm 50 remains free to pivot around tilt bushings 138a, 138b, but tilt bushings 138a, 138b are secured in position relative to curved slots 134 in lower support arm mounting brackets 132. In this manner, the tilt angle of the platform assembly 18 may be adjusted by moving the clamp handle 152 to a release position, rotating the platform assembly 18 about first platform pivot axis 40 to a desired tilt angle, and then moving the clamp handle 152 to a retaining position to secure platform assembly 18 at the desired tilt angle.
A second end 154 of lower support arm 50 is adapted for connection to attachment member 16 for pivotal movement about second attachment member pivot axis 46. Second attachment member pivot axis 46 is defined by support shaft 160. In one embodiment, a torsion spring 163 (
Referring now to FIGS. 7A-B, 8 and 9A-B, routing and operation of the cable 120 and cable housing 120a is described. Cable 120 is longer than cable housing 120a, such that ends of cable 120 extend beyond ends of cable housing 120a. As described above with respect to
Cable anchor 176 is positioned over support shaft 160, and is dimensioned to freely rotate over support shaft 160. In addition, cable anchor 176 is dimensioned to slidably fit between flanges 184 of lower support arm 50, such that lower support arm 50 can slide over support shaft 160 in the longitudinal direction of the elongated slot 162, while the cable anchor 176 remains fixed relative to support shaft 160. Spring 186 (seen in the exploded view of
Referring to
When tilt adjustment means 130 is in the retaining position and platform assembly 18 is rotated by the user about first platform pivot axis 40 approximately 5.50 degrees (
The amount of rotation of platform assembly 18 is dependent upon the necessary change in the effective path length of cable 120 required to disengage the pawl assembly 92 from gear 90. The necessary change in the effective path length of cable 120 is dependent upon the particular geometry of the pawl assembly 92 and gear 90, and the distance pawl assembly 92 must be moved to cause disengagement. The length of elongated slot 162 controls the effective path length of cable 120 and, as noted above, the length of elongated slot 162 may be greater or less than the exemplary 0.10 inches that results in approximately 5.50 degrees of rotation of platform assembly 18 in the exemplary embodiment. Thus, in other embodiments, the amount of rotation of platform assembly 18 about first platform pivot axis 40 required to release pawl assembly 92 from gear 90 may be greater than about 5.50 degrees or less than about 5.50 degrees. In one embodiment, the rotation of platform assembly 18 is in the range of 2 to 8 degrees of rotation about first platform pivot axis 40.
Although specific embodiments have been illustrated and described herein, it will be appreciated by those of ordinary skill in the art that a variety of alternate and/or equivalent implementations may be substituted for the specific embodiments shown and described without departing from the scope of the present invention. This application is intended to cover any adaptations or variations of the specific embodiments discussed herein. Therefore, it is intended that this invention be limited only by the claims and the equivalents thereof.
Claims
1. An articulated support assembly adapted for adjustably supporting a computer keyboard from a horizontal support surface, the support assembly comprising:
- an attachment member adapted to be attached to the horizontal support surface;
- a platform assembly having an upper surface adapted to have a computer keyboard supported thereon, the upper surface having a predetermined orientation with respect to the horizontal support surface;
- a vertically swingable parallelogram linkage having elongated first and second links each having a first end and a second end, the first ends of the elongated first and second links pivotally interconnected to the platform assembly, and the second ends of the elongated first and second links pivotally interconnected to the attachment member, such that the first and second ends of the first and second links each have a pivot axis, and such that the linkage allows vertical displacement of the platform assembly relative to the support surface while maintaining the predetermined orientation of the upper surface;
- a releasable retaining means coupling the first link to the attachment member, the releasable retaining means moveable between an engaged position for preventing vertical movement of the platform assembly toward a lowered position relative to the horizontal support surface, and a disengaged position for allowing vertical movement of the platform assembly toward either a lowered or a raised position relative to the horizontal support surface; and
- means for altering the distance between the pivot axes of the second link, wherein altering the distance between the pivot axes of the second link moves the releasable retaining means between the engaged position and the disengaged position.
2. The articulated support assembly of claim 1, wherein the means for altering the distance between the pivot axes of the second link comprises an elongated through-slot at one of the first and second ends of the second link, the elongated slot configured to receive a shaft defining one of the pivot axes of the second link, the shaft movable between a first end of the slot having defining a first inter-axis distance and a second end of the slot defining a second inter-axis distance.
3. The articulated support assembly of claim 2, wherein the shaft is movable between the first end of the slot and the second end of the slot by pivotal movement of the platform assembly about the pivot axis at the first end of the first link.
4. The articulated support assembly of claim 1, wherein the releasable retaining means comprises:
- a height adjustment gear having radially outwardly projecting gear teeth, the gear attached to the attachment member and coaxial with the pivot axis of the second end of the first link;
- a pawl assembly attached to the first link and configured to engage the gear teeth;
- a biasing member urging the pawl assembly toward the gear teeth; and
- a cable attached to the pawl assembly and configured to pull the pawl assembly away from the gear teeth, the cable extending from the pawl assembly along a cable path to the second link, the cable path alterable between a normal cable path allowing engagement of the pawl assembly with the gear teeth, and a lengthened cable path causing the cable to pull the pawl assembly away from the gear teeth;
- wherein altering the distance between the pivot axes of the second link alters the length of the cable path between the normal cable path and the lengthened cable path.
5. An articulated support assembly adapted for adjustably supporting a computer keyboard from a horizontal support surface, the support assembly comprising:
- an attachment member adapted to be attached to the horizontal support surface;
- a platform assembly having an upper surface adapted to have a computer keyboard supported thereon;
- a first support arm adapted for mounting the platform assembly on the attachment member, a first end of the first support arm pivotally mounted to the platform assembly for pivotal movement of the platform assembly about a first platform pivot axis, a second end of the first support arm pivotally mounted to the attachment member for pivotal movement about a first attachment member pivot axis;
- a second support arm adapted for mounting the platform assembly on the attachment member, a first end of the second support arm pivotally mounted to the platform assembly for pivotal movement of the platform assembly about a second platform pivot axis, a second end of the second support arm pivotally mounted to the attachment member for pivotal movement about a second attachment member pivot axis;
- wherein the first platform pivot axis, second platform pivot axis, first attachment member pivot axis and second attachment member pivot axis are parallel to each other, and wherein the first and second platform pivot axes, the first and second attachment member pivot axes, and the first and second support arms are positioned to define a parallelogram linkage; and
- first releasable retaining means between the first support arm and the attachment member, the first releasable retaining means moveable between an engaged position for preventing rotating movement of the first support arm toward a lowered position relative to the attachment member, and a disengaged position for affording rotating movement of the first support arm toward either a lowered or a raised position relative to the attachment member;
- wherein the first releasable retaining means is moved from the engaged position to the disengaged position by pivotal movement of the platform assembly about the first platform pivot axis.
6. The articulated support assembly of claim 5, wherein the first releasable retaining means comprises:
- a height adjustment gear having an axis and radially outwardly projecting gear teeth, the gear attached to the attachment member and coaxial with the first attachment member pivot axis; and
- a pawl assembly attached to the first support arm and configured to engage the gear teeth;
- wherein the first releasable retaining means is moved to the engaged position by moving the pawl assembly toward the gear and causing engagement of the pawl assembly with the gear teeth, and wherein the wherein the first releasable retaining means is moved to the disengaged position by moving the pawl assembly away from the gear and causing disengagement of the pawl assembly from the gear teeth.
7. The articulated support assembly of claim 6, further comprising:
- a biasing member urging the pawl assembly toward the gear; and
- a cable attached to the pawl assembly and configured to pull the pawl assembly away from the gear, the cable extending from the pawl assembly along a cable path to a cable anchor in fixed relationship to the attachment member, the cable path alterable between a normal cable path allowing engagement of the pawl assembly with the gear, and a lengthened cable path causing the cable to pull the pawl assembly away from the gear;
- wherein pivotal movement of the platform assembly about the first platform pivot axis alters the length of the cable path between the normal cable path and the lengthened cable path.
8. The articulated support assembly of claim 7, wherein pivotal movement of the platform assembly about the first platform pivot axis alters the distance between the second platform pivot axis and the second attachment member pivot axis.
9. The articulated support assembly of claim 7, wherein the cable path is altered between the normal cable path and the lengthened cable path by pivotal movement of the platform assembly about the first platform pivot axis in the range of 2 to 8 degrees of rotation.
10. The articulated support assembly of claim 5, further comprising:
- a third support arm adapted for mounting the platform assembly on the attachment member, a first end of the third support arm pivotally mounted to the platform assembly for pivotal movement of the platform assembly about the first platform pivot axis, a second end of the third support arm pivotally mounted to the attachment member for pivotal movement about the first attachment member pivot axis; and
- second releasable retaining means between the third support arm and the attachment member, the second releasable retaining means moveable between an engaged position for preventing rotating movement of the third support arm toward a lowered position relative to the attachment member, and a disengaged position for affording rotating movement of the first support arm toward either a lowered or a raised position relative to the attachment member;
- wherein the second releasable retaining means is moved from the engaged position to the disengaged position by pivotal movement of the platform assembly about the first platform pivot axis.
11. The articulated support assembly of claim 10, wherein the second support arm is positioned between the first and third support arms.
12. The articulated support assembly of claim 5, further comprising tilt adjustment means joining the second support arm to the platform assembly, the tilt adjustment means movable between a retaining position for limiting pivotal movement of the platform assembly about the first platform pivot axis and positioning the upper surface of the platform assembly at a predetermined orientation relative to the attachment member, and a release position affording relatively free pivotal movement of the platform assembly about the first platform pivot axis.
13. The articulated support assembly of claim 12, wherein when the tilt adjustment means is in the retaining position, the limited pivotal movement of the platform assembly about the first platform pivot axis is sufficient to move the first releasable retaining means from the engaged position to the disengaged position.
14. The articulated support assembly of claim 13, wherein pivotal movement of the platform assembly about the first platform pivot axis alters the distance between the second platform pivot axis and the second attachment member pivot axis when the tilt adjustment means is in the retaining position.
15. The articulated support assembly of claim 13, wherein when the tilt adjustment means is in the retaining position, the pivotal movement of the platform assembly about the first platform pivot axis is in the range of 2 to 8 degrees of rotation.
16. The articulated support assembly according to claim 5, wherein said first releasable retaining means comprises:
- a height adjustment gear having an axis and radially outwardly projecting gear teeth, the gear attached to the attachment member and coaxial with the first attachment member pivot axis; and
- a pawl assembly including a pivot portion and a rocking portion, the pivot portion having a first end mounted on the first support arm for pivotal movement about a pivot portion axis parallel with the first attachment member pivot axis, and a second end having an arcuate surface that is cylindrically concave about an axis parallel to the first attachment member pivot axis and faces the teeth on the gear, the rocking portion having first and second sides, a cylindrically convex surface on the first side adapted to nest in the cylindrically concave surface of the pivot portion and a plurality of teeth projecting along said second side adapted to engage between the teeth of the gear;
- wherein the pivot portion and the rocking portion of the pawl assembly are oriented with the axis of the pivot portion arcuate surface below a straight line between the first attachment member pivot axis and the pivot portion axis to cause the concave surface of the pivot portion to press against the convex surface of the rocking portion and thereby engage the teeth on the rocking portion with the teeth on the gear to prevent revolving movement of the first support arm toward a lowered position relative to the attachment member, while upward movement of the first support arm relative to the attachment member causes the pivot portion to pivot and move the arcuate surface away from the gear to afford separation of the teeth on the rocking portion from the gear and afford revolving movement of the first support arm toward a raised position relative to the attachment member.
17. The articulated support assembly according to claim 16, wherein the rocking portion has a guide surface defining a through-slot generally at the axis of the cylindrically convex surface and a side surface defining a recess along the side of the rocking portion opposite the straight line between the first attachment member pivot axis and the pivot portion axis, wherein the pivot portion includes a pin projecting through the rocking portion slot and adapted to engage the guide surface to carry the rocking portion on the pivot portion and provide a pivot axis for the rocking portion to pivot the teeth adjacent the rocking portion recess out of engagement with the teeth on the gear.
18. The articulated support assembly according to claim 17, wherein teeth on the rocking portion opposite the recess engaged with teeth on the gear when upward movement of the first support arm relative to the attachment member is initiated, and the first support arm has a pin adapted to be engaged by the surface defining the rocking portion recess when the teeth adjacent the recess pivot out of engagement with the gear to restrict further pivoting of the teeth adjacent the recess away from the gear and cause opposite pivot motion of the rocking portion about the pins to cause the teeth opposite the recess to separate from the gear during further upward movement of the first support arm relative to the attachment member.
19. The articulated support assembly according to claim 16, wherein the first releasable retaining means is moved to the disengaged position by pivoting the pivot portion to move the arcuate surface away from the gear and cause retraction of the teeth on the rocking portion to a position spaced from the teeth on the gear.
Type: Application
Filed: Dec 30, 2005
Publication Date: Jul 5, 2007
Applicant:
Inventor: Kenneth Kirchhoff (Gem Lake, MN)
Application Number: 11/324,080
International Classification: E04G 3/00 (20060101);