FR2517942A3 - BALANCING DEVICE FOR WORK TABLES - Google Patents

Abstract

THE PRESENT INVENTION RELATES TO A BALANCING DEVICE FOR WORK TABLES. THIS DEVICE INCLUDES A BRACKET 2, ONE OR MORE LEVER ARMS 7 AND OR 8 PIVOT MOUNTS ON THE FOOT, A WORKTABLE TOP 14 MOUNTED ON THE LEVER ARM (S) AND ONE OR MORE BALANCING DEVICES FOR THE ELEMENTS A BALANCING WITH THE TOP OF THE WORKTABLE, MOUNTED ON THIS BRACKET VIA THE LEVER ARM (S), THIS BALANCING DEVICE INCLUDING A SUSPENSION DEVICE 18 TELESCOPICALLY MOUNTED BETWEEN THE BRACKET AND THE LEVER ARM (s). EACH SUSPENSION DEVICE 18 AT ITS LOWER PART IS SWIVEL HOUSED IN BRACKET 2 AND AT ITS UPPER PART IS SWIVEL HOUSED ON THE ARMS OR LEVER ARMS 7 AND OR 8 ACCORDING TO A NUMBER OF POSITIONS PROVIDED ALONG A LINE ARQUEE CB, OF WHICH CENTER C CORRESTS WITH THE LOWER SUPPORT POINT OF THE SUSPENSION DEVICE. THE INVENTION IS FOR EXAMPLE USABLE FOR THE MANUFACTURE OF DRAWING TABLES.

Description

The present invention relates to a balancing device

  libration for worktables, preferably drawing boards, comprising one or more lever arms pivotally mounted on a support, a worktable top mounted on the at least one lever arm and one or more balancing means for the elements to be balanced, including the top of the worktable, mounted on the support by

  intermediary of the lever (s), this means of balancing

  brage comprising a suspension device operating telescopically, mounted between the support and the arm or arms

of leverage.

  It is known for height-adjustable work tables, for example of the drawing table type, to use pneumatic suspensions to balance equipment such as the top of the drawing table, the drawing apparatus and the mounted lamp. On the table Although the weight of such equipment can vary between wide limits, for example 1560 kg, it is necessary to vary the force in which the air suspension (s) act on the drawing table. which adjustment of the height is obtained to the myoen pivotable lever arm, it is known to mount one or more pneumatic suspensions between the lever arm and the support of the work table adaptation to various loads is often done according to the circumstances, since it is necessary to mount air suspensions with different pressures for the purpose of

make adaptation possible.

  It is also known to mount the suspension or

  pneumatic suspensions in various fixed positions along this lever arm so that different times are obtained pneumatic suspensions The upper end of the air suspension is then pivotally mounted in one or more orifices in this arm and the lower end of this air suspension is mounted in a corresponding hole of an identical series of holes in the support of the work table Also, it

  It is possible to move the tire suspension

  the movement of the suspension arm in the support and thus obtain the desired moment for the pneumatic suspension (s). However, this movement of the pneumatic suspensions is made according to the circumstances, since the position of the mounting As well as it is generally necessary to look for the proper position for a satisfactory balancing of the drawing table, the position of the air suspensions must be adjusted several times.

time.

  Since the position of the air suspensions in the series of holes present is not controlled, it is easy by mistake to mount one or more pneumatic suspensions in

  the bad holes in the support of the drawing board.

  The person working at the drawing table may be

  do not notice this immediately since the balance

  Correct geometry has been obtained, but the air suspension mounted by mistake limits the vertical movement of the drawing table so that the table does not perform the intended function. To be able to move the air suspensions in this series of holes, they must be carefully mounted, parallel to each other, which

  means difficulties for manufacture and that the movement

  paralyzes air suspension complicates

  generally also the fitting of these.

  The purpose of the present invention is to eliminate

  these disadvantages and to make a device of the type

  by a simple means of suitably mounting various points of view, which mainly eliminates or at least largely eliminates the risk of improper adjustment of the air suspension device and at the same time decreases

  time and simplifies assembly and adjustment operations.

is lying.

  These and other advantages are obtained according to the invention.

  by means of a balancing device which is characterized

  in that each suspension device is housed at the bottom to pivot on the support and at the top is housed pivotally

  on the lever arm in one of a number of posi-

  -3- tions provided along an arcuate line whose center coincides with the lower support point of the device

suspension.

  The invention will be further described below with reference to the accompanying drawings or FIG.

  is a side view of a drawing table with a

  tif according to the invention; FIG. 2 is an enlarged-scale side view, as in the case of FIG. 1, of an upper mounting device for a suspension device forming part of the device of FIG. 1; and FIG. 3 is a section through a lower mounting device for the same suspension device

  o Figures 2 and 3 are on the same scale.

  FIG. 1 shows a drawing table 1 comprising a support 2 with two lateral elements 3 (only one element is shown since they are identical). The lateral elements 3 are connected

  to each other by means of a connection bar (not shown

  each lateral element comprises a bar 4 serving as a foot and a tubular arm of the support which is open at the top. A linkage system 6 of the parallelogram type is pivotally mounted at the top of the arm of the support and this linkage comprises two arms of

  lever 7 and 8 which are pivotally mounted on this arm 5.

  These lever arms 7, 8 are pivotally connected to a tilting device 10 comprising a suspension 11 for a tilting load and a brake segment 12 which, together with this suspension, is connected to mounting rules 13 as well as The drawing table 1 also includes a brake lever for adjusting the height and a brake wheel 16 for adjusting the inclination, but these

  units have nothing to do with the present invention.

  A linkage 6 dlt S-parallelogram is mounted on each side member 3 and the support devices of the linkage on the arm 5 of the support are covered from the outside by side plates 17 screwed on

this arm 5 of the support.

  To balance the top 14 of the table to draw and various accessories mounted on the top 14 of this drawing table, balancing devices

  are mounted between the support and the linkage 6 Ces'dispo-

  More specifically, these devices comprise suspension devices 18 operating telescopically, for example of the air suspension type, which are housed in the arm 5 of the support and at their apex on a flange 7a, which is mounted on the lever arm. 7 adjacent to this arm

5 of the support.

  In order to facilitate the mounting and / or adjustment of each suspension device 18, the latter at its lower part is mounted so as to be able to pivot

  around a point C At the top, the device 18 for hanging

  sion is fixed at a position L 3 of a number of positions L1-L8, provided along an arcuate line CB, the center of which coincides with the point C, that is to say the point of support lower suspension device

  18 around which this device can pivot down.

  In the embodiment shown, these posi-

  Ll-L 8 are defined by holes, the centers of which

  coincide with the arcuate line CB According to another possibility

  With regard to the holes, a longitudinal slot (not shown) may be provided, the center of which coincides

  with the arcuate line CB, but such an arrangement may in some cases

  some cases create problems, since the retention of the suspension device at a certain point in the

  slot may require tightening of the gasket.

  For easy mounting of the suspension device 18, the arm 5 of the support comprises a console 19 which is open upwards and which allows the insertion downwards of the suspension device 18 into the latter and its fixing without requiring locking. against extraction in an upward direction but against a lateral slip Here, the suspension device 18 can easily be removed from the arm 5 of the support, when necessary, without prior release and a new suspension device 18 can be inserted in the support arm until it engages the console 19 without

then fix it down.

  The console 19 preferably has a fork shape and can be adjusted vertically with respect to the support arm. The vertical adjustment can be achieved by means of an eccentric knob comprising a handle mounted on the outside. the arm 5 of the support, this handle comprising a rocket axis 21 projecting into a hole of the arm 5 of the support A shaft 22 is mounted eccentrically on the rocket 21 and carries the l.0 console 19 This assembly means that the upper clamping position of the suspension device 18 is adjusted quickly and easily This is achieved by clamping the

  linkage 6 after the attachment thereof in a posi-

  higher than the support 2, and then the handle 20 is rotated and thus moves the consolation 19 to

  Then, the suspension device 18 is moved

  When the suspension device 18 has reached a new upper clamping position, the console 19 is moved

  upwards to the starting position.

  According to the drawing, it is apparent that the

  suspension 18 is for the most part hidden in the tubular arm of the support and protrudes from

of it.

  Only a suspension device 18 is shown in the drawing, but preferably a device

  suspension 18 is provided in each arm of the support.

  The invention of course is not limited to the embodiment described above and represented in the

  drawing but may vary within the scope of the claims

  Therefore, the invention can be used for other types of drawing tables and, preferably, for other worktables than drawing tables instead of

  cooperate with the lever arm 7, the suspension device

  The lever arm 7 forms part of a parallelogram system, as shown, but this is not necessary then

  that the lever arm 7 can be mounted in another way.

  The top and bottom mounting points of the

  Suspended suspension 18 can of course also be -6-

  in another way while maintaining the characteristics

  Finally, it should be noted that the definitions given in relation to the central point C, the arcuate line CB and the positions L1-L8 are the ideal positions desired and in practice are difficult to achieve. should be interpreted as being within

  which are reasonable from this point of view.

  Naturally, various modifications may be made by those skilled in the art to the devices which have just been described solely as non-limiting examples.

  without departing from the scope of the invention.

-7-

Claims (8)

claims:   1 balancing device for work tables, preferably drawers, comprising a support (2), one or more lever arms (7 and / or 8) mounted   pivotally on the support, a work table top (14),   mounted on the lever arm (s) and one or more balancing devices for elements to be balanced including the top of the worktable, mounted on the support   by means of the lever arm or arms, this balancing device   comprising suspension devices (18)   telescopically arranged between the support and the   or lever arms, characterized in that each device   the suspension portion (18) is at its lower part pivotally mounted on the support (2) and at its upper part is pivotally mounted on the lever arm (7 and / or 81 in one of a number of positions (L 1 -L 8), provided along an arcuate line (CB) whose center (C) coincides   with the lower support point of the suspension device if we.   2 balancing device according to claim 1, characterized in that each position (L1-L 8) on the lever arm (7 or 8) for the suspension device (18) is obtained by making an orifice, the center of which coincides * with the arcuate line (CB).   Balancing device according to claim 1, characterized in that a plurality of positions for the suspension device (18) on said lever arm (7 or 8) is obtained by providing a longitudinal slot along which said suspension can be arched according to various positions, o the center of the cotncide slot with the arcuate line (CB).   4 Balancing device according to any one of   Claims 1 to 3, characterized in that the support   (2) comprises at least one bracket (9) in which the suspension device (18) can be inserted and fixed without being locked to prevent the extraction upwards but   to prevent lateral slippage.   Balancing device according to claim 4, characterized in that the bracket $ 19) is vertically adjustable on each bracket (2) and, preferably, the height is adjustable by turning a knob eccentric (20,22).   6 Balancing device according to any one of   claims 4 or 5 characterized in that the console (19) has the shape of a fork.   7 Balancing device according to any one of   Claims 1 to 6, characterized in that at its   lower, the suspension device (18) is housed in a bracket (5) tubular support, at the top of which this arm   lever (7 and / or 8) is pivotally mounted.   8 Balancing device according to one quebonque   Claims 1 to 7, characterized in that the most   much of this suspension device (18) is positioned in the tubular arm (5) of the support and makes protrude from it.   9 balancing device according to claim 8,   characterized in that the upper end of this device   suspension arm (18) is connected to a lever arm (7)   forming part of a parallelogram system (6).