EP0749710B1 - Worktable, in particular for a medical or dental laboratory - Google Patents

Abstract

A work table (1) for a medical or dental laboratory has a guide rod (12) below the table (2) to adjust the work surface (7), the rod adopting an in-use and a not-in-use position. It has a horizontal arm below the table, pivoted to it about a horizonal transverse axis (17a) at the rear plus a guide element at the front. The guide element (24) slides in a path (14) which stretches horizontally (14a) from the rear forwards and then upwards (14b) in a curve. The arm is telescopic between the pivot axis and the guide element or is guided in sliding fashion into a horizontal extension (13, 16) at the rear.

Description

The invention relates to a work table according to the preamble of Claim 1.

A work table of this type is in DE-C-33 28 919 in several Design variants described. In these known configurations is a Suction head between a 10th located above the table surface of the work table Use position and a shifted downwards compared to this Movable position when not in use. The suction head is covered by a its length variable suction line connected to a vacuum source for the purpose Suction of suction material from the suction head of the suction head.

The suction head is on in several of the design variants described above held a guide rod in the form of a four-bar linkage, wherein according to FIG. 9 to 12 of the aforementioned publication, a base part of the quadrilateral joint is pivotable and in an approximately horizontal guide extending from the back to the front is slidably mounted that the suction head around the front face of the table top can be moved around into a non-use position below the table top in which the suction head is in a position that does not disturb the workplace Is not parked.

This known embodiment has proven to be useful, but it is from a complicated and sensitive construction, with the rest a positioning the suction head in its position of use is difficult.

The invention has for its object the work table with respect to To improve the usability of his working device, in particular adapt to different working heights.

This object is achieved by the configuration according to claim 1.

In the embodiment according to the invention, the working device consists of a Workhead and a workbench base, the Work tool head in a guide at the work tool base upwards is displaceable and can be locked in the respective displacement position.

According to a further development, the invention is based on the object of designing a To simplify and stabilize work tables of the type specified at the outset and improve functionally.

In a further development according to the invention, the suction head is at the front end approximately horizontally arranged support arm held in a special Guide arrangement between both a rear and a front adjustment position and at the same time adjustable between a lower and an upper adjustment position or is displaceable that the suction head between one above the work surface use position and one located under the work surface Non-use position is adjustable. The first and according to the invention have been found to be effective second leadership not only in terms of the desired simple design as advantageous, but also for ergonomic reasons with regard to the guideway, resulting in a stabilized and resilient design for the guide arrangement. In addition, the guide arrangement according to the invention enables an adjustment of the Suction head with relatively little effort, which is also a simple, easy-to-use and stable positioning of the support arm in the Can reach the position of use of the suction head.

The subclaims contain features that are too simple and inexpensive produce producible designs of small and functionally advantageous designs.

Furthermore, configurations are also proposed that are safe and that Ensure protective work at the workplace of the work table. For this purpose, a transparent pane is used, which has the required workplace separates the front of the operating side of the work table and thus in particular protects the head of the person working at the work table. In this work area can be reached from both sides with the hands, e.g. around Machining operations, especially grinding work to be carried out protected can. In the foremost position, the protective screen is in front of the Working device, in particular a suction head. The protective screen is on one held above the workplace holder, which is so movable that the Protective screen further back, i.e. also adjustable behind the working device and preferably also to follow an upright adjustment of the working device capable or with its lower edge is movable against the table surface, whereby the The desired work area can be shifted backwards and forwards can be. This is particularly advantageous if not on the Working device but should be worked on the table surface.

With this configuration, the surroundings of the work area can at least be read Protect from dirt and dangers at the front and therefore it is suitable especially for cutting work, especially grinding work. To also the To protect the environment behind the work area, it is advantageous to use one of the to place the rear pane spaced from the front pane on the work table, which can preferably be held on one and the same holder. This is it possible, a front and back limited workspace on the work table to arrange, preferably adjustable.

In the present embodiment, the adjustability of the front pane is complete a pivoting of the holder about a horizontal and transverse pivot axis guaranteed. It is advantageous the rear pane, which is made of transparent or non-translucent material can also cross horizontally running pivot axis to be pivotally mounted on the holder. This configuration not only enables a change in the workplace with regard to it Depth dimension, but it is also possible the rear pane with the bottom edge to pivot against the table surface, whereby the limited between the disks Working space is limited sufficiently tight. It is also advantageous to use the holder for the front or for both discs between a front and a rear end position Arranged movably so that the work area (front protective screen) or the Working space (front and rear protective screen) between a front and a rear position is shiftable. This can be achieved in that the holder arranged on a support arm or formed by this, the corresponding is adjustable.

Fig. 1

einen erfindungsgemäßen Arbeitstisch in perspektivischer Darstellung;

Fig. 2

einen vertikalen, rechtwinklig zur Bedienungsseite des Arbeitstisches verlaufenden Teilschnitt des Arbeitstisches in vergrößerter Darstellung;

Fig. 3

einen Absaugkopf mit zugehörigem Tragarm als bewegliches Bauteil in der Draufsicht;

Fig. 4

den Schnitt III-III in Fig. 2.

The invention and further advantages which can be achieved by means of preferred exemplary embodiments and drawings are explained in more detail below. It shows

Fig. 1

a work table according to the invention in a perspective view;

Fig. 2

a vertical, perpendicular to the operating side of the work table partial section of the work table in an enlarged view;

Fig. 3

a suction head with associated support arm as a movable component in plan view;

Fig. 4

the section III-III in Fig. 2nd

The work table, generally designated 1, consists of a table top 2 with a top table surface 2a, two block-shaped arranged laterally continuously Table legs 3, in which drawers or cupboards accessible from the front are arranged are and between which there is a free space 4 for the legs of the work table 1 working person (not shown) is present, a working device 5, which in middle region of the table top 2 arranged at the front edge and between a use position above the table surface 2a and one under the Table top 2 shifted non-use position is adjustable, and one Protection device 6 for a work device 5 or behind it arranged work place 7 on the table surface 2a with a front protective screen 8 and preferably also a rear protective screen 9 made of transparent material, such as Glass or plastic on a holder arranged above the table top 2 arranged and preferably between a front and a rear Working position are adjustable.

The working device 5 formed by a working head or a suction head 5a is at the front end of a support arm 12 extending under the table top 2 arranged, so in a horizontal longitudinal guide 13 and a vertical guide 14 is that he is located under the table top 2 Not in use position first to the front, then up around the front edge of the Table top 2 around and then slightly backwards into the above the table top located use position and can be moved back again. The longitudinal guide 13 is a horizontal straight guide with a slide 15, which is in a guide link 16 with sliding or rolling surfaces between a rear and front end position free is movable. The rear end of the support arm 12 is transverse in a joint 17 and horizontally extending joint axis 17a can be pivoted vertically with the slide 15 connected or vertically pivoted in the guide link 16. The length of the Support arm 12 is dimensioned so large that in the front end position of the longitudinal guide 13 a support plate projecting rearward from the suction head 5a in its upper region 18, in particular made of wood, with its rear end in the manner described above Front edge of the table top 2 is movable.

The vertical guide 14 is a curved guide in the form of a sled runner extending horizontally and straight from its rear end Longitudinal guide section 14a, an adjoining and upward curved, in particular in the form of a circular arc section, curved by 180 ° Vertical guide section 14b and preferably another, different from the latter approximately horizontally rearwardly extending vertical guide portion 14c of can be short guide length and a few cm in the present embodiment is.

The support arm 12 consists of a rear support arm section 12a and a front Support arm section 12b, each of which can extend straight and one upwards Include an open obtuse angle, here an angle of approximately 150 °.

As particularly shown in Fig. 2, the guides 12, 13 are in a common cuboid guide box 19 integrated on the underside of the table top 2 attached, e.g. by screws. As can be seen from Fig. 4, the Guide box 19 an upper base wall 21 and two of them projecting downwards Side walls 22a, 22b, in which the vertical guide 14 in the form of one are formed correspondingly shaped groove 23. The support arm 12 is by means of two guide rollers 24 in the grooves 23, the diameter of which Width of the groove is adjusted with play, so that the boundary surfaces 23a, 23b of the groove 23 form guide surfaces on which the guide rollers 24 roll. At the front and upper end of the vertical guide 14 is in the lower there Boundary surfaces 23b incorporated a small depression or trough 25 into which the Guide rollers 24 sink in. This forms a so-called rest stop from which the support arm 4 by pulling forward and a little effort is extractable. The is in this front guide end position Suction head 5a directly in front of the table top 2, the support plate 18 covering the table surface 2a protrudes to the rear at a small vertical distance. As in particular Fig. 3 shows, in order to improve the service life 23 elbows 26 in the grooves be used with a vertical and a horizontal leg so that at least the lower boundary surface through the horizontal leg 27 is formed, which preferably consists of wear-resistant material. With one Arrangement is the width taking into account the thickness of the horizontal Leg 27 to be dimensioned wider so that the guide rollers 24 fit therein. The Angle pieces 26 can with their vertical legs on the side walls 22a, 22b be attached.

The guide rollers 24 are freely rotatable on an axis 28, which is on the support arm 12, here in the rear area of which is attached to the support arm section 12b, preferably on a one-piece, in particular attached to the top of the support arm part 12b welded component 29 (see Fig. 4). At least one guide roller 24 has one coil-shaped body with two end flanges 24a for the side walls 22a, 22b or the leg 27, which provides lateral guidance.

In a corresponding manner, the longitudinal guide 13 with a groove 23a and therein arranged lower or also upper angle pieces 26a in a side wall 22a in one side wall 22a or in both side walls 22a, 22b and running therein Guide rollers 24b may be formed, see detail X in FIG. 4.

Is in the non-use position pushed back under the table top 2 the suction head 5a at least partially between the side walls 22a, 22b, between which it can be inserted.

The suction head 5a has an upward and preferably at the same time obliquely rear-facing suction opening 31, which is concave in the present embodiment is rounded to meet the aforementioned alignment features, and by a Grid or the like is closed to suck small components prevent. A suction line 32 extends downward from the suction opening 31 and behind to a filter device, not shown, which a the worktable 1 assigned single device or a collection device for several work tables 1 or Suction devices can be.

In the present embodiment, the suction head 5a can be moved approximately vertically or telescopic, i.e. not only adjustable in height by its support arm 12, but also independently of it in itself. For this purpose, the suction head 5a is formed in several parts with a movable suction head part 33 and a fixed suction head part 34, of which the latter is preferably rigidly arranged at the front end of the support arm 12 and the movable suction head part 33 has an upright slide 35 which in a guide part 36 projecting upward from the lower suction head part 34 vertically is movable. To determine in the respective shifted position of the upper Suction head part 33 is a locking device 37 with a manually operable Locking part, here in the form of a lever 38, which by turning on a not illustrated clamping part, e.g. acts in the form of an eccentric or a screw part and the slider 35 clamps on the guide part 36. In the present embodiment the lever 38 is arranged laterally in a downwardly projecting position.

The suction line 32 extends through the upper and lower suction head part 33, 34 as a length-adjustable hose or bellows 39, which is between a pipe socket is attached to the upper and lower suction head part 33, 34 and in one him receiving cavity between the upper and lower suction head part 33, 34 located. The lower pipe socket is the front end of a suction channel 44, which is extends longitudinally through the support arm 12, here the front support arm section 12b, wherein the latter preferably through a tube, here a flat tube oval Cross-section is formed, which at its rear end a pipe socket 45 for the Connection of another length-adjustable hose or bellows (not shown), which forms a further part of the suction line. How 3 shows in particular, the rear support arm section 12a is on one side of the sun formed pipe attached, e.g. welded on. Here, the obtuse-angled turns out Arrangement of the support arm sections 12a, 12b as in particular in the upper Adjustment position as favorable, in order to create space for other components.

The displaceable unit formed by the suction head 5a and the support arm 12 46 is associated with an extension auxiliary device 47, as is the case in principle with drawers or flaps is known per se. This auxiliary device 47 is in the rear area of the Guide box 19 arranged, and it has a pressure member 48 which along the Movement direction of the unit adjustable and in by a spring, not shown the extension direction of the unit is preloaded when inserting the unit a contact part at the rear end of the rear bracket part 12b the pressure part 48 around inserts a certain distance backwards, being in this insertion position locked. By applying a second pressure with a certain amount of force into the Insertion direction, the pressure part 48 can be inserted another piece, whereby the above-described latching is released and the pressure part 48 by its Spring force after releasing the unit 46 by a certain amount, e.g. around a extends a few centimeters beyond the end of the slot so that the Suction head 5a easily gripped by hand and pulled out further to the front can.

At the front upper edge of the working device 5 or the suction head 5a is one Bracket 51 preferably in the form of an open socket 52 for the Front protective disk 8 is provided, which covers the work area 7 towards the front and thus protects. The preferably by a horizontally and transversely extending Groove 55 formed socket 52 and the protective disk 8 preferably extend diagonally upwards to the rear. The bracket 51 can also be used as a clamp bracket be formed with a spring leg 56 which the protective disk 8 laterally in the Jack 52 is stuck.

In the present embodiment, such a first holder 51 has a first Groove 55, into which the protective pane 8 can be inserted from above, and a second holder 57 in the form of an open top, offset with respect to the first groove 55 to the rear Groove 58 provided as a support device for the same or another Protective disk 59 is used.

The protective pane 8 can be attached to one of the table top 2 or the workplace 7 arranged holder 61 in a socket or bottom open groove 52 detachable or permanently attached, e.g. by at least one clamping screw 63. The holder 61 is arranged so that the protective disk 8 between one shown rear position in which they are in front of the suction opening 31 and the Working device 5 is and a position in which it is behind the Suction opening 31 or the working device 5 is adjustable, so that the Depth or the front boundary of the work area 7 is shiftable. On the other hand the holder 61 is arranged adjustable in height, so that the protective disk 8 upright movement of the upper suction head part 33 is able to follow or on the latter is adaptable, as shown in Fig. 2.

The above-described adjustability of the protective pane 8 can also be achieved by a Adjustability of the on a stand in the rear area of the work table 1 realize supported holder 61, the holder 61 adjustable in height and / or is adjustable in depth or its distance from the front operating side. To the latter can be a telescopic support arm 66 for the holder 61 serve. In the present embodiment, the holding arm 66 is from behind forward-extending bracket 66 which is hinged at its rear end 67 with a horizontal and transverse joint axis 68 directly or indirectly connected to a support 69, which is at the rear edge area of the table surface 2a is attached to the work table 1. The carrier 69 can be one act upright stand or support rod. In the present Design is the carrier 69 by a support frame 71 with two vertical Side bars 71a and a horizontal cross bar 71b connecting them to one another formed, wherein the joint 67 is preferably arranged on the cross member 71b. Of further, the joint 67 is preferably attached to a front attachment part 72 and thus at a forward distance from the support frame 71 or stand arranged. The stand or support frame 71 is preferably on a square Hollow profile 70 preferably fastened from metal, the rear into the worktable 1 is embedded and as various electrical and pneumatic lines Installation rail serves.

2 shows, the rear protective screen 9 is also held on the holder 61, wherein it is preferably free in a joint 73 with a horizontal transverse axis 73a is pivotally held on the holder 61. The joint 73 consists of a bracket 61 downward projecting first joint part 73b and a rear protective disk 9 holding second joint part 73c with a downwardly open groove 73d, in which the Protective screen 9 is inserted with its upper edge area and fastened therein, e.g. by gluing. The rear protective screen 9 is preferably dimensioned somewhat higher than the front protective screen 8, which takes into account the distance in which the suction head 5a is in its use position above the table surface 2a. The height of the rear protective disk 9 is such that its lower one Edge 9a in the lower one shown in FIG. 2 with solid lines Use position in an obliquely downward sloping position the table surface 2a rests and in a lower position in the upper position of use Oblique position on the table surface 2a, as shown in Fig. 2 with dash / dotted lines is shown.

Between the two protective panes 8, 9 there is a work space above the work station 7 defined, which is open on both sides, so that not only the hands of the work table 1 working person from both sides, but also air to Suction head 5a can flow.

It is further advantageous, at least the front protective screen 8 and preferably also to hold the rear protective screen 9 on a holding head 76, which is connected by a joint 77 with a horizontal and transverse joint axis 77a pivotable with the Holding arm 66 is connected. This makes the front especially adaptable Protective disc 8 and also the rear protective disc 9 on the suction head 5a and the table surface 2a improved. In addition, at least the front protective screen can be 8 in a position behind the suction head 5a on the table surface 2a position even with one pushed back into its non-use position Suction head 5a. The rear protective screen 9 can depend on the one hand their arrangement on the holding head 76 and the other independently due to their Follow bracket in joint 73 of front protective screen 8. So not only that front limitation of the workplace 7 or work area by the front Protective pane 8 can be varied in depth, but also the work area as a whole.

The holding head 76 preferably has a cap-shaped shape with a Front wall 76a, which extends in particular obliquely downwards and on which the front protective pane 8 is preferably held in the groove 52 in a detachable or non-detachable manner, a top wall 76c and two side walls 76d, whereby the front end of the Holding arms 66 is covered in a cap shape.

The holding head 76 can also be as an elongated approximately over the top edge length of the Protective panes 8, 9 extending head strip 76e can be formed, which in FIG is indicated and the upper gap between the protective disks 8, 9 closes.

The holder 61 is preferably provided with a relief device 81 for its weight provided so that it is easier vertically and / or horizontally (transversely to the operating side) can be adjusted. For this purpose, a spring 82 is used, which is between the stand or Support frame 71, here the attachment part 72 and the holding arm 66, is arranged such that a torque exerted by it on the holding arm 66 is greater in lower positions is in higher positions, which means that the effective weight resulting, downward force K of the holder 61 is counteracted, so that the latter can be easily adjusted by hand. The tension spring 82 is in the shown position of use of the holder 61 at a distance a above the position of the joint 67 between the support frame 71 or extension 72 or an attachment 83 thereof and clamped on the holding arm 66 at a point 84, which are on the one hand in the longitudinal center of the holding arm 66 and on the other hand above the Joint 67 is located. At this point, a bolt can be provided on which the Tension spring 82 is suspended. In the swung up position of the Holder 61, which is also shown in dot-dash lines in FIG. 2, but is incomplete, the rear protective screen 9 is in a freely hanging position close to the upward-pointing support arm 66, the front protective screen 8 being inclined stands down with a position in which it does not interfere with work place 7.

Claims (14)

1. Work table (1) for a laboratory, in particular a medical or dental laboratory, having a work station (7) on the forward region of its table top (2) at which there is arranged a work apparatus (5) which is displaceable on a guide assembly (12, 13, 14) between a use position located above the table top (2) and an out-of-use position arranged below the table surface (2a),
   characterised in that,
   the work apparatus (5) comprises a work apparatus head (5a) and a work apparatus base, the work apparatus head being guided in a guide (35, 36), upwardly displaceably on the latter, and being fixable in the respective displaced position.
2. Work table according to claim 1,
   characterised in that,
   the guide assembly has a carrier arm (12) arranged under the table top (2), extending approximately horizontally, which in its rearward region is mounted on the work table (1) pivotable around a horizontally and transversely extending pivot axis (17a) and, at a spacing extending forwardly from the pivot axis (17a), has a guide element (24) that is displaceably guided in a guide path (14) which extends from a rearward guide path end initially approximately horizontally (14a) forwardly and then in particular curved upwardly (14b), the guide element (24) being positionable in the upper region of the guide path and the carrier arm (12) being telescopic in the region between the pivot axis (17a) and the guide element (24) or being displaceably guided at its rearward end in a further, horizontally extending guide (13, 16).
3. Work table according to claim 2,
   characterised in that,
   a preferably horizontally rearwardly extending guide path section (14c) adjoins the upwardly extending guide path section (14b).
4. Work table according to claim 2 or 3,
   characterised in that,
   the transition between the forwardly extending guide path section (13) and the upwardly extending guide path section (14) and/or the transition between the latter and the rearwardly extending guide path section, are curved, in particular curved in the shape of an arc section of a circle.
5. Work table according to claim 3 or 4,
   characterised in that,
   in the use position of the work apparatus (5) there is arranged a depression (25) in the rearwardly extending guide path section (14c), into which the carrier arm (12) latches with its associated guide part (24).
6. Work table according to any preceding claim,
   characterised in that,
   the carrier arm (12) is with its rearward end mounted displaceably by means of a guide roller (24a) in the approximately horizontal guide (13), preferably formed by means of a groove (23).
7. Work table according to any preceding claim,
   characterised in that,
   the guide path sections (13, 14) are provided to both sides of the carrier arm (12).
8. Work table according to any preceding claim,
   characterised in that,
   the guide path sections (13, 14) are formed by means of respective grooves (23), in one of which or in which the carrier arm (12) is displaceable respectively with a conducting or rolling guide element (24).
9. Work table according to any preceding claim,
   characterised in that,
   the guides (13, 14) are respectively arranged in or on one or two lateral up-standing guide walls (22a, 22b), which is or are arranged below the table top (2) and is or are preferably directly or indirectly attached to its underside.
10. Work table according to any preceding claim,
    characterised in that,
    in the not-in-use position of the work apparatus (5) an ejection aiding device (47) is associated with the carrier arm (12) which by means of manual pressure against the work apparatus (5) in the insertion direction is released and at least partially pushes out the work apparatus (5).
11. Work table according to any preceding claim,
    characterised in that,
    the guide path sections (13, 14) and the further guide (16) and the ejection aiding device (47) are integrated in a mounted unit in particular of box-like shape which is preferably attached to the underside of the table top (2).
12. Work table according to any preceding claim,
    characterised in that,
    a forward protective plate (8; 9) is associated with the work station (7), which is held at a holder (61) above the work station (7) or on the work apparatus (5) .
13. Work table according to claim 12,
    characterised in that,
    the forward protected plate (8) is held on the holder (61) adjustable in height and/or pivotable around a horizontal transverse axis (77a).
14. Work table according to claim 12 or 13,
    characterised in that,
    at a spacing to the rear from the forward protection plate (8) there is provided a rearward protection plate (9) which is preferably held at the holder (61), and is in particular held pivotably around a horizontal transverse axis (73a).

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