DE29706140U1 - Swivel arm lamp - Google Patents

Description

Eickhorst & Co., Borsteler Chaussee 85-99, 22453 Hamburg

Swing arm light

The invention relates to a swivel lamp, in particular for illuminating and/or lighting workstations in laboratories, workshops, offices or the like, with a double-arm swivel system, the two arms of which are connected to one another in an articulated manner and of which a first arm carries the lamp housing with the lamp in an articulated manner at its free end, while a second arm is rotatably mounted at its free end on a holding device such as a clamp, clamp, lamp base or the like.

Lights of this type are now well known and are used in a wide variety of versions, e.g. in the form of the parallelogram arm lights commonly found in offices. In these, the second arm is mounted in the form of a bearing arm in the holding device, usually in the form of a holder attached to the table or worktop using a screw clamp, so that it can rotate around a vertical axis, while the pivot pin is located on a lower bearing block that accommodates the ballast, mains connection, switch, etc. The two bearing arm parallelogram rod elements, each of which can be pivoted around horizontal axes, are mounted on this bearing block. At its upper end, the bearing arm also accommodates the two parallelogram rods of the first arm, i.e. the support arm for the light housing, in two pivot points and via a V-shaped intermediate connecting element equipped with three bearing points. At its free end, the support arm also carries two swivel axis bolts, which support a head bearing part in the form of a lamp housing holder, which has another horizontal swivel axis, possibly combined with a second, but perpendicular horizontal axis for tilting the lamp housing.

housing. This lamp housing holder, which can be pivoted about the second horizontal axis, can also be bent at an angle in certain lamp designs and can carry the actual lamp housing at its free end, which can then be rotated about a further, essentially vertical axis.

These known lights require a large number of individual parts and above all joints to ensure that the light housing can be moved freely into the correct working position. Such joints are very expensive to manufacture. Furthermore, due to the pivoting ability of the bearing arm around the lower holder, the pivoting system projects strongly backwards in certain light positions relative to the table or worktop, so that further free space must be available beyond the top, i.e. on the side of a work surface opposite the operator. Furthermore, such lights have usually only been used in the so-called T-position, i.e. in an essentially central arrangement on the worktop with the light housing movable forwards, while lateral positioning with pivoting across the top has been used less frequently. One of the factors that plays a significant restrictive role here is the force compensation system in the form of tension springs on the first and second parallelogram arms, which are required to absorb the high moments, especially when the arms are extended further. Furthermore, the known lights can only accommodate relatively light light housings due to their relatively light rod construction with the usual double spring systems for force compensation. This meant that the requirements for lighting that mainly worked with point radiation could be taken into account. However, for the requirements that now exist, namely the illumination of work areas with flat light of the highest luminous intensity compared to

traditional point and area light luminaires and the resulting significantly larger lamp and thus housing and support frame dimensions as well as space requirements with regard to the heavier sockets, ballasts, etc. the structures are no longer sufficient.

The object of the invention is therefore to create a compact swivel lamp which, in adaptation to newer requirements of a modern workplace swivel lamp and at the same time in eliminating increasingly apparent defects of the double parallelogram arm lamps, requires a significantly reduced number of individual components and, above all, a minimum of swivel points, thus reducing the number of swivel points which increase production costs.

To solve this problem, the invention proposes a swivel lamp of the type outlined at the beginning, in which the second arm is designed as a rigid, essentially straight and tubular component that is mounted exclusively in a rotatable and pivot-free manner relative to the holding device. The bearing arm is thus designed as a rigid standpipe that only rotates about a vertical axis; this standpipe can be used to accommodate the technical functional elements such as ballasts, switches, mains connection/3, cabling etc., i.e. over its entire height as a housing element and at the same time also for an aesthetically pleasing redesign of conventional lamp support frames. Such a tubular component has a large resistance moment and makes it possible to dispense with expensive base joint constructions with devices for force compensation for the high moments of force that arise when used in a cantilevered position. In other words: the force is absorbed solely by a pivot pin designed as a stable bearing pin. Although the lamp according to the invention does not allow for any - or at least only with the acceptance of certain compromises in the open air

·

·

Handling a T-arrangement is possible. However, it must be taken into account that this T-position requires space in traditional lamps due to the need for free pivoting to the rear. However, this is not necessary with the lamp according to the invention, as the latter allows a relatively larger work surface that is not affected by the lamp frame. With the lamp according to the invention, a more space-saving arrangement can be achieved and thus in turn a reduced work surface that needs to be illuminated overall. The design of the lamp according to the invention is therefore crucial in achieving a shallow table depth.

In order to achieve an additional shortening of the support arm or a complete utilization of the illuminated work surface with the greatest possible lateral arrangement of the lamp in relation to the overall workstation, the extension axis of the second arm, i.e. the bearing arm, can run at an acute angle to the axis of its pivot bearing on the holding device.

The lamp is preferably designed in such a way that the first arm is designed as a telescopic arrangement with an outer first elongated profile element and a second rod-shaped profile element received by the latter and displaceable relative thereto, whereby the first and second profile elements are each mounted on the second arm so as to be pivotable against frictional forces and support the lamp housing, while a weight compensation tension spring is effectively tensioned between them. Such an arrangement saves space and enables the weight compensation spring, which ensures the secure position of the lamp housing or, in other words, its set distance from the work surface, to be housed in a way that is not noticeable from the outside. Since, due to the joint design between the two arm parts, which generates frictional forces, a displacement is only possible

within narrow limits, no particular guidance problems arise. Rather, the necessary stabilization of the position of the lamp housing is achieved as a result of the friction between the parts in their joint bearings, for example by using inexpensive elements such as spring washers or small disc springs. Locking screws, as used in conventional products, are in any case superfluous.

The outer profile element can advantageously be provided as an extruded profile part with a substantially closed, rectangular cross-section, while the rod-shaped profile element accommodated therein can be designed as a U-shaped bent sheet metal part and corresponding to the diameter of the weight compensation spring. In this way, the manufacturing costs can be further reduced, as matching extruded profiles can be cut practically "off the shelf" and then only need to be finished. At the same time, the use of relatively light materials is possible, which guarantee sufficiently high strengths in the form of profile parts.

In connection with the rotary bearing of the lamp, it is advantageous if the lower end of the second arm has a bearing inside it for receiving a rotary pin that forms the main bearing element of the lamp. In this way, a bearing construction can be achieved that is considerably simpler in terms of cost than known lamps, in which the horizontal pivoting, i.e. foot/3-joint bearings are eliminated and the force is absorbed solely by the rotary pin. The pin can be a vertical pin fixed in the holding device and its bearing in the second arm can be a bearing bush that is press-fitted into the lower part of the second arm and is designed as a lubrication-free plastic milled part. All forces can therefore be absorbed by this one appropriately dimensioned pin.

and any weight compensation elements such as springs are not necessary in this area _/ because, in particular, due to the telescopic design of the first arm, such a dimensioning of the single spring is possible, since /3 this makes further spring elements superfluous.

From the point of view of technical practicality as well as aesthetic design, it is possible to design the second arm in such a way that it is essentially composed of a U-shaped extruded profile and an open-circular extruded profile attached to its free legs and thus covering the U-opening. On the one hand, such a combination results in a unique external outline shape that has not been seen before in lamps, in conjunction with the creation of sufficient interior space for the technical and functional components. At the same time, the use of extruded profiles is of course also advantageous here in terms of production costs.

With such a design, the U-shaped extruded profile can extend beyond the upper edge of the circular extruded profile and have the bearing points for the bearing bolts for pivoting the first arm, i.e. the support arm, at its upper end. Furthermore, a switch for the light can preferably be arranged in the lower area on one of the legs of the U-shaped extruded profile. This means that this element, which is important for commissioning, is in an easily accessible place.

In order to be able to arrange the lamp housing as appropriately as possible with regard to the required degrees of freedom in its mobility, the first arm can carry it with a double joint by means of a head joint. This is mounted on the one hand on the outer and on the other hand on the rod-shaped profile element accommodated in it in order to ensure the parallelogram arrangement, and here again,

if necessary, with the necessary means to achieve an inhibition of free mobility, e.g. under the influence of weight and gravity/3.

Preferably, the head joint can be essentially made up of two parts, consisting of an inner joint part hinged to the first arm and an outer joint part that pivots over this and supports the lamp housing in a rotatable manner. This results in a very simple form of a two-axis joint basic component, which is also always held in an aligned horizontal position by its double bearing on the two elements of the first arm.

In order to ensure that the lamp housing can be swiveled sideways relative to the first arm without any problems, the inner part of the joint can be provided with a slot or recess for the passage of a cable leading to the lamp housing, so that the lamp housing can be swiveled by at least 90° to each side from its T-position in relation to the main axis of the first arm, i.e. the support arm.

This lamp housing is also designed in a manner known per se as a flat body which can accommodate the necessary lamps, depending on the lighting requirements, whereby this housing body can be expediently designed with handles on the side for easy and - with regard to possible heat development - safe handling.

After all, the invention provides a new type of swivel lamp with a significantly simplified construction, in which, compared to the known lamps of the parallelogram arm design, not only are the joints in the foot/seat area eliminated, but the entire technical effort required for weight compensation in parallelogram arms is significantly reduced by providing, on the one hand, a rigid column that is easy to store, while weight compensation

The same and positional stability are achieved essentially by the telescopic bearing arm with its friction bearing. The elimination of the ankle joint is of crucial importance because in this way the high moments caused by the overhang do not need to be compensated by springs in the lower area. Instead, the force is absorbed solely by the pivot pin. There is also no need for free space behind the lamp, which can be easily swiveled into a side parking position so that when the lamp is not needed, practically the entire work surface is available. Overall, therefore, compared to conventional parallelogram arm lamps, a larger work surface is available that is not affected by the lamp bearing, which also means that ultimately only a smaller table depth is required.

Further advantages and embodiments or possibilities of the invention will become apparent from the following description of the embodiments shown in the schematic drawing. It shows

Fig. 1 is a diagrammatic overall view of the swivel lamp according to the invention on

a worktop,

Fig. 2 a highly simplified representation of the lamp in three height positions, viewed from the side,

Fig. 3 in plan view the lamp in working position A and parking position P above a worktop and
35

Fig. 4 the luminaire according to the invention in side view and schematic section to show structural details.

The swivel lamp according to the invention, as shown in Fig. 1 above a work surface F, essentially comprises a lamp housing 1 and a swivel arm system 2 supporting it, which is mounted on a holding device 3 so as to be rotatable about an axis 300, whereby this holding device 3 can optionally be connected to the work surface F. The double-arm swivel system 2 essentially consists of a first arm 21, hereinafter also referred to as the support arm, and a second arm 22, hereinafter also referred to as the bearing arm. The bearing arm is rotatably mounted on the holding device via a pivot pin 31, which cannot be seen in more detail here but is shown in Fig. 4. The support arm 21 supports the lamp housing 1 via a head joint 4. The support arm 21 is, as will be described below with special reference to Fig. 3 and 4, constructed as a parallelogram link and as such can be pivoted relative to the bearing arm 22, here simply indicated by a hinge point 200. The lamp housing 1, here also simply indicated by a hinge point 400, is articulated relative to the support arm 21 within the framework of the parallelogram structure of the same and can be pivoted horizontally via a further axis 421. In addition, it can be rotated, as will be explained later.

As can be seen from Fig. 2, the lamp can be moved in height simply in a circular arc around the articulation point 200, whereby the parallelogram guide of the housing 1 becomes particularly clear here. On the other hand, as Fig. 3 shows particularly clearly, by rotating the bearing arm 22 around the axis of rotation 300 in the foot area, it is possible to move from a parking position P, for example at the rear, which leaves the work surface F essentially free, to a working position A.

- 10 -

possible, so that when the lamp is mounted in the outermost corner area of the work surface F, every necessary lighting position can be achieved in conjunction with the height adjustment options shown in Fig. 2. In order to enable such movement of the lamp housing 1 in a convenient manner, handles 11 are attached to the side of the housing, while the housing itself accommodates lamps and reflectors in an arrangement suitable for the intended use.

The lamp according to the invention shown in Fig. 4 sits with its support arm 22, as already mentioned, rotatably on a pivot pin 31 defining the axis 300, which is mounted in a fixed seat in the holding device 3, here designed as a foot attached to the worktop. The mounting takes place via a plastic milled part 221 in the lower part of the support arm 22, which in turn is made up of two extruded profiles. The extruded profiles are a rear, U-shaped part 222 and a round extruded profile part 223 that spans the free U-legs of the latter, which is cut out and spans the U-legs in such a way that a cavity composed of a U and a circle is formed inside for accommodating technical components and functional parts, here only schematically indicated by two rectangles 225a, b. A switch 224 is located on the part 222.

The U-shaped extruded profile part 222 is extended upwards beyond the second part 223 and carries bearing bolts and 202, which together determine the bearing point 200 for the support arm 21, only indicated in Fig. 1. This bearing point is designed as a friction-inhibited pivot bearing with the help of spring rings, disc springs or similar elements, which is sufficiently known in itself.

- li -

The support arm 21 is made up of an outer profile element and a rod-shaped profile element 212 which is held by the latter and has the shape of an inverted U, whereby these two elements form the parallelogram mentioned above. In the space enclosed by the U there is a weight compensation spring (not shown in detail here), which is sufficiently well known in itself and in its function and ensures that the lamp housing can always assume and maintain a horizontal position as indicated in Fig. 2, whereby its spring force and the frictional inhibition of the bearing parts 200 are coordinated accordingly, as is also well known. The outer profile element 211 is designed as a closed, rectangular profile and is hinged to the bearing arm 22 at 201, while the inner profile element is hinged to the extruded profile part 222 at 202.

At the front end of the support arm 21, as already mentioned, a head joint 4 is doubly hinged, namely at on the outer profile element 211 and at 402 on the inner profile element 212. The head joint 4 comprises an inner joint part 41 and a U-shaped outer joint part 42, both of which can be pivoted against each other perpendicular to the plane of the sheet in an axis 421 determining the hinge point 400, so that in this way the housing body 1 can be pivoted laterally on a circle around 421. So that a power supply cable 10 to the lamp housing 1 does not represent an obstacle during this lateral pivoting, the inner joint part 41 is provided with a slot through which the cable can pass. Furthermore, approximately in the extension of the cable, a rotation axis 422 is provided, which is only indicated here and runs perpendicular to the axis 421, with the aid of which the lamp housing 1 can be rotated relative to the head joint 4.

·

In order to be able to handle the lamp housing 1 easily, the previously mentioned handles 11 on the sides of the housing body are used.

Claims (14)

Expectations: 1. Swivelling luminaire, particularly for illuminating and/or lighting workplaces in laboratories, workshops, offices, etc. The like, with a double-arm swivel system (2), the two arms (21, 22) of which are connected to one another in an articulated manner and of which a first arm (21) carries the lamp housing (1) with lamp in an articulated manner at its free end, while a second arm (22) is rotatably mounted at its free end on a holding device (3) in the form of a clamp, clip, lamp base or the like, characterized in that the second arm (22) is designed as a rigid, essentially straight-line and tubular component which is mounted exclusively rotatably (300) and pivotably relative to the holding device. 2. Swivel lamp according to claim 1, characterized in that the extension axis (20) of the second arm (22) runs at an acute angle (α) to the axis (300) of its mounting on the holding device (3). 3. Swivel lamp according to one of claims 1 and 2, characterized in that the first arm (21) is designed as a telescopic arrangement with an outer first elongated profile element (211) and a second rod-shaped profile element (212) received by the latter and displaceable relative thereto, wherein the first and second profile elements are each mounted on the second arm (22) so as to be pivotable against frictional force (201 and 202 respectively) and carry the lamp housing (1), while a weight compensation tension spring is functionally tensioned between them. 4. Swivel lamp according to claim 3, characterized in that the outer profile element (211) is provided as an extruded profile part with a substantially closed rectangular cross section, while the rod-shaped profile element (212) received therein is designed as a U-shaped bent sheet metal part and corresponds to the diameter of the weight compensation spring. 5. Swivel lamp according to one of claims 1 to 4, characterized in that the lower end of the second arm (22) has a bearing (211) in its interior for receiving a pin (31) forming the main bearing element of the lamp. 6. Swivel lamp according to claim 5, characterized in that the pin (31) is a vertical pin fixedly arranged in the holding device (3) and its bearing (221) in the second arm (22) is a bearing bush inserted in the lower part of the second arm in a press fit and designed as a lubrication-free plastic milled part. 7. Swivel lamp according to one of claims 1 to 6, characterized in that the second arm (22) is essentially composed of a U-shaped extruded profile (222) and an open-circular round extruded profile (223) attached to its free legs and thus covering the U-opening. 8. Swivel lamp according to claim 7, characterized in that the upper end of the U-shaped extruded profile (222) has the bearing points (201, 202) for the bearing bolts for friction-inhibited pivot mounting of the first arm (21). 9. Swivel lamp according to claim 7 or 8, characterized in that on one of the legs of the U-shaped • * - 15 - A switch (224) for the lamp is arranged in the extruded profile (222). 10. Swivel lamp according to one of claims 1 to 9, characterized in that the first arm (21) carries the lamp housing (1) in a double-articulated manner by means of a head joint (4). 11. Swivel lamp according to claim 3 and 10, characterized in that the head joint (4) is mounted on the one hand on the outer and on the other hand on the rod-shaped profile element (211 or 212) received therein. 12. Swivel lamp according to claim 10 or 11, characterized in that the head joint (4) is essentially composed of two parts, consisting of an inner joint part (41) articulated to the first arm (21) and an outer joint part (42) pivotably overlapping the first arm and supporting the lamp housing (1) in a rotatable manner. 13. Swivel lamp according to claim 12, characterized in that the inner joint part (41) has a slot or other recess for the passage of a cable (10) to the lamp housing (1) when the latter is swiveled sideways relative to the first arm (21). 14. Swivel lamp according to one of claims 1 to 13, characterized in that the lamp housing (1) is designed as a known flat body with lateral handles (11).