U.S. patent application number 12/998128 was filed with the patent office on 2011-07-14 for device for mounting a table top on a frame with drive means.
Invention is credited to Peter Jahnsen, Jorgen Nordqvist.
Application Number | 20110168064 12/998128 |
Document ID | / |
Family ID | 41279168 |
Filed Date | 2011-07-14 |
United States Patent
Application |
20110168064 |
Kind Code |
A1 |
Jahnsen; Peter ; et
al. |
July 14, 2011 |
DEVICE FOR MOUNTING A TABLE TOP ON A FRAME WITH DRIVE MEANS
Abstract
The present invention relates to a device for mounting of a
table top on a table frame (1, 2, 3, 4, 5, 6) and/or individual
table legs, with drive means (8, 9) for optional adjustment of the
height of the table top (14), fixing means (10, 11) on the table
top (14) being interconnectable to drive means (8, 9) on the table
frame (1, 2, 3, 4, 5, 6) and/or the table legs, one or more sensors
(15, 32) being disposed to sense possible movement between the
fixing means (10, 11) on the table top (14) and the drive means (8,
9) in the event of undesirable movement between the table top (14)
and the table frame (1, 2, 3, 4, 5, 6) and/or the table legs, in
order thereby to prevent the adjustment of the position of the
table top (14).
Inventors: |
Jahnsen; Peter; (Vaggeryd,
SE) ; Nordqvist; Jorgen; (Vaggeryd, SE) |
Family ID: |
41279168 |
Appl. No.: |
12/998128 |
Filed: |
September 18, 2009 |
PCT Filed: |
September 18, 2009 |
PCT NO: |
PCT/SE2009/000415 |
371 Date: |
March 21, 2011 |
Current U.S.
Class: |
108/147 |
Current CPC
Class: |
A47B 13/021 20130101;
A47B 9/00 20130101; A47B 2200/0057 20130101 |
Class at
Publication: |
108/147 |
International
Class: |
A47B 9/20 20060101
A47B009/20 |
Foreign Application Data
Date |
Code |
Application Number |
Sep 24, 2008 |
SE |
0802030-7 |
Claims
1. A device for mounting a table top on a table frame and/or
individual table legs, with drive means for optional adjustment of
the height of the table top above a seating and/or standing surface
area, said device comprising: fixing means on the table top being
interconnectable to the drive means on the table frame and/or the
table legs, resilient or yieldable means being disposed between the
fixing means on the table top and the drive means on the table
frame and/or the table legs, to permit a certain degree of movement
between the table top and the table frame and/or the table legs;
and one or more sensors are being disposed to sense possible
movement between the fixing means on the table top and the drive
means on the table frame and/or the table legs, wherein the
movement sensor or movement sensors are disposed to disable the
drive means in the event of undesirable movement between the table
top and the table frame and/or the table legs, thereby to prevent
adjustment of a position of the table top in relation to the table
frame and/or the table legs and also the standing or seating
surface area.
2. The device as claimed in claim 1, wherein the resilient or
yieldable means comprises rings, washers, gaskets or bushings of
elastomeric material.
3. The device as claimed in claim 2, wherein the resilient or
yieldable means comprise rubber rings with holes for additional
fixing means disposed between the fixing means and the drive means
and comprising bolts, pins or screws.
4. The device as claimed in claim 1, wherein the movement sensor is
disposed between the table top and the table frame.
5. The device as claimed in claim 1, wherein the movement sensor is
disposed between the table top and each table leg.
6. The device as claimed in claim 1, wherein the movement sensor is
comprises a strain gauge.
7. The device as claimed in claim 6, wherein the strain gauge
displays a body which is secured between the fixing means on the
table top and the drive means on the table frame or the table legs,
and which supports a strain gauge element, said fixing means being
mutually movable.
8. The device as claimed in claim 7, wherein the body supports a
pin for engagement with the part movable in relation to the
body.
9. The device as claimed in claim 8, wherein he pin is provided
with a hat or cap of elastomeric material.
10. The device as claimed in claim 1, wherein the movement sensor
is self-calibrating for adaptation to static loads.
11. A table that is provided with a device as claimed in claim
1.
12. The device as claimed in claim 2, wherein said elastomeric
material comprises a rubber material.
13. The device as claimed in claim 2, wherein said elastomeric
material comprises a plastic material.
Description
[0001] The present invention relates to a device according to the
preamble to appended claim 1.
[0002] Seating- and standing tables and similar arrangements are
being increasingly used at different workplaces and also in the
home. The prior art structures are provided with different types of
jamming protection, whereby the drive units (drive motors) are
disabled in the event of a risk of a jamming or pinching injury.
Such prior art structures are illustrated in publications SE 516
479, US 2005/0012430 and US 2005/0082997 A1. However, these prior
art structures have proved to display insufficient sensitivity to
slight loads above the normal load which is carried by the table
top. This also applies to so-called point or concentrated loads and
oblique loads. In addition, the prior art structures have proved to
suffer from defective mechanical stability.
[0003] The task forming the basis of the present invention is to
improve the prior art structures by obviating the drawbacks as
outlined above.
[0004] This task is solved in the device disclosed by way of
introduction in that it has been given the characterising features
as set forth in the appended claims.
[0005] A device according to the present invention affords major
possibilities for great mechanical stability without jeopardising
sensitivity to such slight loads as occur in the event of a pinch
or jamming risk during adjustment of the table top for changing the
level of the table top above a standing or seating surface, and
thereby the working height. Thus, the present invention makes for a
considerably safer and more sensitive structure than prior art
structures without in any jeopardising the desired mechanical
stability. Further, a device according to the present invention
makes for considerably greater versatility in the utilisation of
the movement sensing and adjustment of the different drive
units.
[0006] Embodiments of the present invention will be described in
greater detail hereinbelow with reference to the accompanying
Drawings.
[0007] FIG. 1 is a photographic representation of a table frame for
the application of a device according to the present invention.
[0008] FIG. 2 is a perspective view of a part of a table with a
device according to one embodiment of the present invention.
[0009] FIG. 3 is a view similar to FIG. 2 with the parts separated
from one another.
[0010] FIG. 4 is substantially a similar view to FIG. 2 of another
embodiment of a device according to the present invention with the
parts separated from one another.
[0011] FIG. 5 is a section taken through a part of the embodiment
of FIG. 4.
[0012] FIG. 6 is a section taken in the direction of the arrows VI
in FIG. 5.
[0013] FIG. 7 is a perspective view of a detail of the part shown
in FIGS. 5 and 6.
[0014] FIG. 8 is a perspective view of a part of a table frame with
a device according to a further embodiment of the present
invention.
[0015] FIG. 9 is a perspective view of a part of a table frame with
a device according to yet a further embodiment of the present
invention.
[0016] FIG. 10 is a perspective view on a larger scale of a part of
the device according to FIGS. 8 and 9.
[0017] FIG. 11 is a section similar to FIG. 5 of a variation of the
embodiment shown in FIG. 5.
[0018] FIG. 12 is a section taken along the line XII-XII in FIG.
11.
[0019] FIG. 13 is a perspective view on a larger scale of a part of
the embodiment of the device in FIGS. 11 and 12.
[0020] FIG. 1 shows a table frame for a standing and seating table
of per se known type. The table frame has two legs 1 and 2, each
with its foot 3 and 4. The legs 1 and 2 are interconnected to one
another by means of longitudinal beams 5 and 6. These support a
drive unit 8, 9 at each leg 1, 2, as well as a bracket 10 and 11. A
table top of in principle optional contour rests on the brackets 10
and 11, as well as the longitudinal beams 5 and 6. The table top
may be rectangular or curved in different suitable ways, with a
view to permitting a comfortable and efficient working position.
The drive units 8 and 9 include as a rule an electric motor which,
via a gear, is connected to a screw which extends down into the
legs 1, 2. The drive units 8, 9 are as a rule powered by means of a
suitable electronics unit, which is connected to a suitable power
source, e.g. the standard power mains, and which by means of a
suitable button cluster or set is actuable for adjusting of the
table top upwards or downwards. The illustrated table frame
supports a table top 14.
[0021] FIGS. 1 and 2 show only a part of a table with the device
according to the present invention, and it will be apparent from
the Figures that the legs 1 and 2 are of the telescopic type, with
an inner portion 12 and an outer portion 13. The table top 14,
which may be manufactured from any optional material and, as in
FIGS. 1 and 2, may be assumed to be manufactured from a transparent
material, so that the brackets 10, 11 and the longitudinal beams 5
and 6, as well as the drive units 8 and 9, are visible through the
top.
[0022] Between the bracket 10 and the drive unit 8, there is
mounted a movement sensor 15 which, via a cable 16, is connected to
the electronics unit for supplying driving current to the drive
unit 8. The movement sensor 15 is mounted, on the one hand, on the
bracket 10 by means of bolts 15A and, on the other hand, on the
drive unit 8 by means of bolts 15B. Thus, the movement sensor 15 is
disposed between mutually movable parts, i.e. the table top 14 and
the table legs 1, 2. The bracket 10 is mounted on the drive unit 8
by means of two bolts 17 and 18 which extend through the bracket 10
and each through a ring, washer or gasket 19 and 20. Further, the
longitudinal beams 5 and 6 are mounted on the drive unit 8 by means
of bolts 21, 22 and 23, 24, which extend through holes in the beams
5 and 6 and each through its ring, washer or gasket 25, 26 27, 28
to threaded holes in the drive unit 8, which is connected to the
electronics unit via a cable 29. The latter threaded holes need
not, naturally, be located in the drive unit 8 proper, but for
example in a bracket therefor. The rings, the washers or the
gaskets 19, 20, 25, 26, 27, 28 may extend in bushing-like fashion
into and possibly through the holes in the brackets 10 and the
longitudinal beams 5, 6 for the bolts 17, 18, 21, 22, 23, 24. The
arrangement at the other table leg 2 is in principle identical to
the arrangement illustrated in FIG. 3.
[0023] As a result of the device in FIG. 3, the table top 14 will
thus in principle be movably mounted on the drive unit 8 with the
aid of the elastomeric parts in the form of the rings, the washers
or the gaskets 19, 20, 25, 26 and 27, 28, of which the latter may
also be designated pads or cushions. Possible movement between the
table top and the drive unit 8 and the table leg 1 or the table leg
part 13 will thus be transmitted to the movement sensor 15 or, in
other words, be exercised on it, and such a possible movement will
result in a signal which is fed via the cable 16 to the electronics
unit and which disconnects supply of the driving current to the
drive unit 8. This will occur in the event of a risk of pinching or
jamming.
[0024] The embodiment of a device according to the present
invention illustrated in FIG. 4 has its drive unit disposed in the
table leg 1. On the underside of the table top 14, there is
disposed a fixing plate 30 which is mounted on the fixing plate 31
of the drive unit 8 via a movement sensor 32 which is shown in
greater detail in FIGS. 5, 6 and 7. The movement sensor 32 displays
a moving part 33 which is fixed in the table top 14 via the
mounting plate 30. This, as it were, moving part 33 is secured in
pads 34 and 35 which consist of elastomeric material, e.g. rubber
or other similar material, and which are secured in a mounting
member 36 which is fixed on the plate 31 of the drive unit 8.
Between the moving part 33 and the mounting plate 36, there is
disposed a strain element 37 which supports a strain gauge 38 and
which is secured on the moving part 33.
[0025] The strain element 37 is shown in greater detail in FIG. 7.
The strain element is designed so as to permit large movement where
the strain gauge 38 is positioned. The signal from the strain gauge
38 is fed to the electronics unit via the cable 16. The strain
gauge 38 is further positioned so as to receive mechanical
protection against damage in the event of extreme movement
amplitudes between the parts 33 and 36. The protected positioning
of the strain gauge 38 will further permit the employment of more
sensitive indicators that has hitherto been possible.
[0026] In the embodiment of the device according to the present
invention illustrated in FIG. 8, the longitudinal beams 5, 6 are
fixedly mounted on the drive unit 8 by means of bolts 39, 40, 41,
42. The bracket 10, on which the table top rests, is fixed with a
certain play on the drive unit 8 by means of bolts 43, 44, each of
which extends through a first washer 45 and a second washer 46, a
hole 47 in the bracket 10 to a fixing hole 48 in the drive unit 8
as intimated by means of ghosted lines. The second washer 46 is
elastomeric and fits at least partly in the hole 47 and may
therefore be considered as a bushing therein. The movement sensor
15 displays a pin 49 which freely extends through a hole 50 in the
wall of the drive unit 8 into engagement with the bracket 10 e.g. a
hole 51 in the bracket 10. The pin is suitably provided with a cap
or hat 52 for tolerance completion and thereby elimination of
possible movements between the pin 49 and the bracket 10.
[0027] The embodiment illustrated in FIG. 9 is substantially alike
the embodiment illustrated in FIG. 8, apart from the fact that the
longitudinal beams 5, 6 are fixed in the drive unit 8 with a
certain play in relation thereto in fundamentally the same manner
as the bracket 10 in FIG. 8. Thus, the beams 5,6 are fixed on the
drive unit 8 by means of bolts 53, 54, 55, 56 which each extend
through a first sleeve 57, a second sleeve 58, a third sleeve 59
and through a hole 60 in the longitudinal beam 5, 6. The sleeves
57, 58, 59 fit into one another and in the hole 60 and the length
corresponds substantially to the thickness of the longitudinal beam
5, 6, so that movement between the longitudinal beams 5, 6 and the
drive unit 8 is permitted in the same manner as between the bracket
10 and the drive unit 8. The second sleeve 58 is of elastomeric
material, and may be considered as a bushing.
[0028] FIG. 10 shows the movement sensor 15 in greater detail. The
movement sensor 15 has a body 61 which is designed in a manner
suitable for its purpose and which supports a strain gauge 62. At
the one end of the body 61, the previously mentioned pin 49 is
secured therein. The pin 49 is not required in all practical
applications. Further, the body 61 is provided with a number of
mounting holes 63, 64, 65, 66. The strain gauge element 62 is
connected to a connection means 67 by the intermediary of wires
68.
[0029] The embodiment of a device according to the present
invention illustrated in FIGS. 11, 12 and 13 is in principle
similar to the embodiment illustrated in FIGS. 5, 6 and 7, apart
from the fact that the movement sensor 32 is of the type
illustrated in FIG. 10. In this practical application, the pin 49
is however omitted, since the body 61 is fixed on the mounting
plate 36 by means of a bolt 69 and a spacer 70, and on the moving
part 33 by means of a bolt 71 and a spacer 72. The bolts 69, 71 and
the spacers 70, 72 contribute to a fixed union between the body 61
and the mounting plate 36, as well as the moving part 33. All parts
display the same reference numerals in the different Drawing
Figures.
[0030] The movement sensors or strain gauge elements may be of
different types, for example wire strain gauges, piezoelements,
etc. Further, they should preferably be of the self-calibrating
type so that account is taken of any possible static load such as
working equipment placed on the table top. The present invention
permits the use of extremely sensitive indicators, since they are
positioned with mechanical protection. The parts of the elastomeric
material between the parts fixedly connected to the movement
sensors and the parts substantially fixedly connected to the table
top afford a certain mechanical protection of the movement sensors,
but also contribute to realising a more uniform signal.
[0031] Numerous modifications are naturally conceivable without
departing from the scope of the inventive concept as this is
defined in the appended claims.
* * * * *