DE20023069U1 - work light - Google Patents

Description

4226/18 EN 1 » *,». ·&igr; ·* August 13, 2002

Sonlux lighting and electrical installation tinbH»| C». 3c6»<?oncfersinau«en

DESCRIPTION Work light

The invention relates to a work lamp.

Work lights are known from practice and from US 6050710, DE 299 04 650 U 1 and DE 198 02 998 A 1 and have a housing in which at least one light source is arranged, which is supplied with energy from a power network via a mains connection. Such lights are used as portable lights, particularly on construction sites in rooms in which no light sources have yet been installed. In order to enable installation, work lights known from practice have a base and/or a standing or holding surface.

To supply the light source with energy, power supply devices are installed in work lights that are known from practice. These are mounted on circuit boards made of a brittle plastic material. The circuit boards, in turn, are mounted on metal mounting plates that serve to keep the circuit boards free from mechanical stress. This design makes the manufacture of the work lights more difficult and expensive.

On construction sites where the above-mentioned mobile work lights are used, the work lights are subjected to high levels of stress, as it is impossible to prevent the work lights from falling over or being knocked over. Furthermore, in practice it is not possible to pack the work lights for transport from construction site to construction site, so that the work lights

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Sonlux Lighting and Electrical Installation GmbH & Co. RG Sonde»sheusen. Il ,'

This can also result in large loads, which can cause wiring to come loose.

The invention is based on the object of providing a work lamp which has a simple structure and at the same time is highly mechanically resilient.

This object is achieved according to the invention with the features of claim 1.

According to the invention, in a mobile work light for use on construction sites, the circuit board is connected to the housing without the need for a mounting plate. This reduces the number of components and avoids the risk of wiring between individual components arranged on mounting plates, which is the case with the prior art, becoming loose. The housing also has a flexible, impact-resistant frame and a rigid mounting area for the power supply device arranged within the frame. The flexible, impact-resistant frame means that the mobile work light can be subjected to even strong blows and impacts without being damaged, while the rigid mounting area ensures that deformations of the frame are not transferred to the circuit board, which would otherwise lead to its destruction. The rigid mounting area for the circuit board is reinforced by ribbing. Ribbing has the advantage that

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Sonlux Lighting and Electrical Installation GmbH & Co. K(| Special works · II . *

it can be created without additional work steps and components. Screw domes provided on the ribbing for fastening the circuit board allow a secure and permanent connection of the circuit board to the housing.

If flexible compensation elements are arranged between the screw domes and the circuit board, it can even be permitted that the mounting area is slightly deformed, which further increases the overall shock and impact resistance of the work light.

A particularly cost-effective manufacturing process can be achieved if the housing is manufactured using a two-component injection molding process. In such a process, at least the edge of the housing frame should be made of a soft rubber material.

In order to achieve maximum strength, the circuit board should be made of a fiber-reinforced, preferably glass fiber-reinforced material, whereby the circuit board should in particular contain a resin as a binding material.

From an electrical point of view, it is advantageous if the work light on the circuit board is provided with both a low-voltage power supply device for battery operation and a mains voltage power supply device for mains operation of the at least one light source.

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Sonlux Licht- und Elektroinstallation GmbH & Co. KG · I j .*

Further advantageous embodiments and developments of the invention emerge from the subclaims and from the description in conjunction with the drawings.

Show it:

Fig. 1 shows a work lamp according to the invention in a simplified perspective view,

Fig. 2 a view of the internal structure of the work light in Fig. 1 with partially broken circuit board,

Fig. 3 the work lamp in Figs. 1 and 2 in a simplified, partially sectioned perspective view with the cover and reflector removed, and

Fig. 4 is a simplified circuit diagram of a first embodiment of a power supply of the work lamp shown in Figs. 1 to 3 with electronic ballast, wherein the illuminant is designed as a gas discharge illuminant and wherein for an emergency lighting device which has a DC power supply device with emergency lighting electronics, a switch position of the power supply is queried by the emergency lighting electronics,

Fig. 5 shows the DC power supply device provided in the power supply according to Fig. 4 in a detailed representation,

Fig. 6 is a simplified circuit diagram of a second embodiment of a power supply of the type shown in Fig. 1 to 3

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Sonlux Lighting and Electrical Installation GmbH & Co. K® Sonderehausea » II .*

shown work lamp, wherein a magnetic ballast is provided, and

Fig. 7 is a diagram for the charging current of a charging electronics during temporary operation on the mains.

The mobile work light 10 shown in Figure 1 has a housing 12 with a frame 14, which is covered on its front side with a front panel 16. The front panel 16, which has three vertical bars (not shown) for stabilization, is frosted in its lower area for aesthetic reasons. In its upper area, the front panel 16 is crystal clear. The front panel 16 is made of polycarbonate.

The housing 12 is manufactured as a two-component injection-molded part with the dimensions W/H/D=300mm/320mm/115mm, with the frame 14 enclosing a rigid mounting area 18. The housing as a whole is designed like a trough and consists essentially of dark, preferably blue-colored polycarbonate. At its front end, facing the front screen 16, the frame is manufactured in one piece as a rubber-like holding and sealing part 20. The rubber-like holding and sealing part 20 of the frame 14 is designed to be flexible in such a way that the front screen 16 can be fitted into it, with the holding and sealing part 20 of the frame 14 simultaneously functioning as a seal for the front screen 16. The holding and sealing part 20 of the frame 14 protrudes like a bead over the plane of the front screen 16 to prevent damage to the front screen 16 if the work light 10 falls over. Without sockets, the work light has protection class II and a protection

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Sonlux Licht- und Elektroinstallation GmbH & Co. K§ SonjderehatjseH · &iacgr; j t*

degree IP54 according to VDE, with sockets protection class I and a protection degree IP44.

On the back of the housing 12, in addition to a base 22 that can be locked into various locking positions for different light emission directions and can be used as a carrying handle, there are sockets (not shown) and a cable duct 23 for the power cable 24, which is designed as a rubber connecting cable. The carrying handle/base 22, which is made of ABS, allows the work light 10 to be mounted on a tripod. The power cable 24 is guided into the housing 12 along the axis of rotation of the carrying handle/base 22, since no device plug socket is provided. The underside of the housing 12 is designed as a standing surface.

Inside the housing 12 of the work light 10, in addition to the power supply devices, there is a reflector 26 made of vapor-coated plastic material and a light source 28. The light source 28 is a TC-F compact tube with a power consumption of 36 watts in a single base. A TC-F compact tube provides a luminous flux of 2800 lm. Alternatively, the work light 10 can be designed with a base for two TC-F compact tubes, each with a power consumption of 36 watts, although this embodiment is actually preferred due to the higher light output. In such a case, a thermal circuit breaker is provided to prevent overheating, which prevents the work light 10 from being destroyed, in particular if it is too close to a wall when switched on or if the front panel 16 is lying on the floor.

A switch 34 for operating the power supply of the lamp 28 allows the lamp 28 to be switched off.

4226/18 DE 1 ,1 **^Il2 “'Augütät 2PÜ2, ,**

Sonlux Lighting and Electrical Installation GmbH & Co. KG .

and use the work light 10 as a distributor.

The lighting means is preferably supplied with electrical energy by a first embodiment of a power supply shown in Figures 1 and 5. The power supply has an AC power supply device 30 which is connected to a network supplying 230 V AC via a terminal base 32 and the power cable 24. To switch on the AC power supply device, a power switch 34 is provided which is provided on the housing 12 of the work light 10 for manual operation. On the output side, the AC power supply device 30, which contains an electronic ballast, is connected to the lighting means 28 via a four-pole line 36 and a switch 40 provided on a DC power supply device 38. On the output side, the AC power supply device 30 supplies an operating voltage of approximately 100 V and a corresponding ignition voltage, whereby the AC power supply device 30 allows a warm start by pre-heating the electrodes of the lighting means 28. The DC voltage and AC voltage power supply units 38, 30 are both power supply units that enable the work light to operate on its own.

The direct current power supply device 38, which is shown in detail in Figure 5, has a rechargeable battery device 42, which can be switched to the lamp 28 via a voltage converter 44 and the switch 40. The voltage converter 44 converts the power from the rechargeable battery device 42, which is designed as 6 V 1.2 Ah

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NiCd battery, converts the direct current supplied (approx. 80-100 V) into a lamp operating voltage of 130 V. The rechargeable battery device 42 is designed as a high-temperature battery device and allows a continuous thermal load of ⁴⁰⁰ C to ⁷⁰⁰ C, in particular ⁶⁵⁰ C. With this battery device, emergency lighting operation for 20-30 minutes is possible with the work lamp described. The direct voltage power supply device 38, the battery device 42 and the lamp 28 together form the emergency lighting device.

The rechargeable battery device can be charged via a power supply unit 46 and a charging device 48, wherein the power supply unit 46 is connected via its inputs to the power cable 24.

In order to control the power supply of the lighting means 28, the charging operation of the rechargeable battery device 42 and, if necessary, an emergency lighting operation of the lighting means 28, control electronics 50 are provided which have an output 52 for switching between working operation and emergency lighting operation via the switch 40. The output 52 controls a switching transistor 54 which controls the working current of the switch 40 designed as a relay. The working current for the switch 40 is supplied by the rechargeable battery device 42.

Furthermore, the control electronics 50 has an output 56 via which the voltage converter 44 is switched on or off.

In order to determine whether the power supply allows the lamp 28 to be supplied during operation,

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Sonlux Lighting and Electrical Installation GmbH & Co. K?3 SoSdeash&uSent !S

An input 60 is provided in the control electronics 50, via which a measuring voltage representing the network is fed to the control electronics 50. A diode 62 provided in the charging device 48 prevents not only a discharge of the rechargeable battery device 42, but also an incorrect evaluation of the voltage states. The charging device 48 and the control electronics 50 together form the charging electronics.

Since the power pack 46 is permanently connected to the power grid when the work light 10 is plugged in, the control electronics 50 have a second input 64, via which the switch position of the power switch 34 is queried. When the power switch 34 is closed, not only the AC power supply device 30 is supplied with voltage, but also, via a resistor 66, a light-emitting diode 68 of an optical coupler 70, the photocell 72 of which supplies a signal to the control electronics 50 via the second input 64 if the power switch 34 is closed. If the power switch 34 is closed and there is no reference voltage at the input 60 due to a lack of mains, the control electronics 50 switches the switch 40 to emergency lighting mode, so that the energy provided by the rechargeable battery device 42 is available to the lamp 28 via the voltage converter 44. The start of the lamp 28 in emergency lighting mode is designed as a cold start according to the power supply in Figures 4 and 5.

In addition to switching the work light 10 between working mode and emergency light mode, the control electronics 50 controls the charging of the rechargeable battery device 42.

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Sonlux Lighting and Electrical Installation GmbH & Co. KG ßoijdfeijshjiijseji· jj _# ·*

A battery voltage input 74 is provided on the control electronics 50. If the battery voltage is below a predetermined target value, a charging transistor 76 is activated via the output 78 of the control electronics. A charging LED 80, which is activated by the control electronics 50 in the case of charging operation, allows the charging process and thus the charge state of the rechargeable battery device 42 to be monitored.

All electrical and electronic components except for the light source 28, its base and the accumulator device 42, in particular the AC power supply unit 30, the DC power supply unit 38 and the charging electronics are arranged on a common circuit board 82 (Fig. 2, Fig. 3). This minimizes the effort required for wiring within the work light, while at the same time reducing the risk of contacts coming loose to a minimum.

The circuit board 82, which has a glass fiber reinforced epoxy resin base body with a material thickness of 1.0 - 3.0 mm, preferably 2.0 mm, is attached to the housing 12 in the rigid mounting area 18 by means of screws and without the interposition of a mounting plate via screw domes 84. The screw domes are arranged in the area of nodes of a ribbing 86, which is made of polycarbonate in one piece with the surrounding housing 12. Although the frame 14 is also made of polycarbonate except for the holding and sealing area 20, a different deformation behavior results, since the frame 14, in contrast to the mounting area 18, is designed without ribbing and is therefore much more flexible. This construction, in which the edge areas, namely

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The fact that the holding and sealing area 20 and the frame 14 are more flexible than the mounting area 18 means that the work light deforms in these areas when subjected to impacts and blows, while the mounting area 18 remains deformed. This prevents damage to the circuit board 82, which is installed without a mounting plate.

Due to the design of the circuit board 82 and the mounting area 18, it is even possible to provide a strain relief for the power cable 24 on the circuit board 82.

The second embodiment of a power supply shown in Figure 6 for the work light 10 shown in Figures 1 to 3 differs from the power supply according to the first embodiment shown in Figures 4 and 5 only with regard to the AC power supply. For elements of the power supply according to the second embodiment in Figure 6 that correspond to elements of the power supply according to the first embodiment in Figures 4 and 5, reference numerals are therefore used that are increased by 100 compared to the first embodiment. Reference is made to the description of the corresponding parts.

In Fig. 6, an AC power supply device 190 is provided for the working mode, which has a starter 192 and an inductance 194. It is clearly visible that the line 136 leading to the lighting means 128 via the switch 140 is designed as a four-pole device, whereby a warm start is also provided for the working mode and a cold start for the emergency lighting mode in the power supply according to Fig. 6.

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In Fig. 7, an example of a charging current curve is shown for temporary operation of the work lamp 10 on the mains, which is carried out by the control electronics 50, wherein the charging current I is plotted against time t. In Fig. 7, I _s designates a high standard charging current and I _E a lower maintenance charging current. The rechargeable battery device 42 is discharged at the beginning of the curve plotted in Fig. 7.

If at time t _x the work light 10 with a discharged rechargeable battery device 42 is connected to the mains by connecting the mains connection cable, the control electronics determine that the charge level of the rechargeable battery device 42 is insufficient and switches the charging device 48 to the standard charging current. If at time t ₂ the work light 10 is disconnected from the mains or if the mains fails at time t ₂ , the charging process of the rechargeable rechargeable battery device 42 is interrupted. If the mains voltage is available again at time t ₃ , the charging process is continued with the standard charging current I _s until time t ₄ , at which time the mains connection is interrupted again. At time t ₅ the charging process is continued with the high standard charging current as at time t ₃ if the charge level of the rechargeable battery device is insufficient until a sufficient charge level is reached at time t _6. A standard charge always takes place when the charge is below 70%, preferably below 80% of the maximum charge. At this time t _{6 ,} the control electronics 50 switches to a maintenance charging current I _E which is below the standard charging current until a mains interruption occurs at time t ₇ . If the mains is available again at time t ₈ and emergency lighting has not taken place between times t ₇ and t _a , the control electronics switches

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50 only needs a few minutes for the high standard charging current I _s , in order to switch back to the trickle charging current I _E at time t ₉ . This type of charging of the accumulator device 42 means that an optimum charging state is achieved in a short time even in the event of a power failure, while overcharging is avoided. The requirements for emergency lighting operation and with regard to service life are in an optimum ratio.

Claims (23)

1. Mobile work light for use on construction sites, with a housing ( 12 ), at least one illuminant ( 28 ) arranged therein and with a power supply device ( 30 , 38 ) arranged in the housing ( 12 ) and supplying the illuminant ( 28 ) with electrical energy, mounted on a circuit board ( 82 ), characterized in that
that the printed circuit board ( 82 ) is connected to the housing ( 12 ) without the interposition of a mounting plate,
wherein the housing ( 12 ) has a flexible, shock-resistant frame ( 14 ) and a rigid mounting area ( 18 ) for the printed circuit board ( 82 ) arranged within the frame ( 14 ),
wherein the housing ( 12 ) has a ribbing ( 86 ) in the rigid mounting area ( 18 ) for the printed circuit board ( 82 ),
wherein the ribbing ( 86 ) has screw domes ( 84 ) for fastening the circuit board ( 82 ). 2. Work light according to claim 1, characterized in that flexible compensating elements are arranged between the screw domes and the circuit board. 3. Work light according to claim 1 or 2, characterized in that the housing ( 12 ) is manufactured in a two-component injection molding process. 4. Work light according to claim 3, characterized in that at least the edge ( 20 ) of the frame ( 14 ) of the housing ( 12 ) is made of a soft rubber material. 5. Work lamp according to one of claims 1 to 4, characterized in that the circuit board ( 82 ) is made of a fiber-reinforced, preferably glass-fiber-reinforced material. 6. Work lamp according to one of claims 1 to 5, characterized in that the circuit board ( 82 ) has a resin as a binding material. 7. Work lamp according to one of claims 1 to 6, characterized in that both a direct voltage power supply device ( 38 ) for battery operation and an alternating voltage power supply device ( 30 ) for mains operation of the at least one lighting means ( 28 ) are provided on the circuit board (82). 8. Work lamp according to one of claims 1 to 7, characterized in that a strain relief for a mains connection cable ( 24 ) is provided on the circuit board ( 82 ). 9. Work lamp according to one of claims 1 to 8, characterized in that at least one, preferably two gas discharge lamps are provided as lighting means, which are operated simultaneously with the respectively active energy supply device. 10. Work lamp according to one of claims 1 to 9, characterized by an emergency lighting device ( 38 , 42 , 28 ) for emergency lighting operation. 11. Work lamp according to claim 10, characterized in that the emergency lighting device ( 38 , 42 , 28 ) is automatically activated in the event of a power failure. 12. Work lamp according to claim 10 or 11, characterized in that the emergency lighting device ( 38 , 42 , 28 ) has a rechargeable battery device ( 42 ). 13. Work lamp according to claim 12, characterized in that charging electronics ( 48 , 50 ) are provided for the rechargeable battery device ( 42 ) in or on the lamp housing ( 12 ). 14. Work lamp according to claim 13, characterized in that the charging electronics ( 48 , 50 ) automatically charges the rechargeable battery device ( 42 ) when the work lamp ( 28 ) is in operation. 15. Work lamp according to claim 14, characterized in that the charging electronics ( 48 , 50 ) carry out a charging process in which a high charge state of the accumulator device ( 42 ) has priority. 16. Work lamp according to one of claims 11 to 15, characterized in that the emergency lighting device ( 38 , 42 , 28 ) queries a switching element ( 34 ) in order to distinguish between a mains interruption and a switching off of the work lamp ( 28 ). 17. Work lamp according to claim 16, characterized in that the switching element has a main path for switching the working current and a secondary path for evaluating the switching state. 18. Work lamp according to claim 16, characterized in that the switching element has two measuring outputs or an electronic query, in particular with at least one inductive, capacitive or optical coupler ( 70 ) in order to detect a mains voltage. 19. Work lamp according to one of claims 10 to 18, characterized in that the emergency lighting device has a replaceable battery device. 20. Work lamp according to one of claims 1 to 19, characterized in that the lighting means ( 28 ) is a low-voltage gas discharge lighting means, and that a mains voltage operating device is provided for operating the lighting means ( 28 ) in working mode. 21. Work lamp according to claim 20, characterized in that a low-voltage operating device is provided for operating the work lamp in emergency lighting mode. 22. Work lamp according to one of claims 10 to 21, characterized in that the luminous flux in emergency lighting mode is 30% to 50%, preferably 40% of the luminous flux in working mode. 23. Work lamp according to one of claims 1 to 22, characterized in that the mains connection on the housing ( 12 ) has a device plug socket and a mains connection cable ( 24 ) provided with a device plug.