EP1728023B1 - Portable lamp - Google Patents

Abstract

The invention relates to a lamp comprising a folding screen which is at least partially provided with a reflective layer and has at least one mobile tensioning means for stretching the folding screen, said folding screen surrounding a luminant in the taut state and in the relaxed state. The inventive lamp comprises blocking means for preventing the screen from folding up when the luminant is hot. Furthermore, an optional tensioning aid and a blocking device can be provided in order to prevent against premature folding of the screen.

Description

The invention relates to a luminaire with a folding screen provided at least partially with a reflective layer, wherein one or more movable tensioning means are provided, which span the folding screen and the folding screen encloses a lighting means in the tensioned and in the relaxed state.

Transportable lights with a folding screen are known as hand or floor lights and are preferably used for temporary illumination of rooms or exposed areas. Depending on the intended use, it can be lights with low power or even lights up to 1,000 watts and more. The latter are preferably used in open-air areas for the illumination of, for example, a construction site, accident sites, large-scale damage situations or sports events.

From the European patent application EP 1 059 483 For example, a portable lamp is known in which a lampshade is clamped by a clamping mechanism. As a special feature of this design is to be emphasized that the phosphor screen encloses the lamp almost completely. When using these portable lights, especially when using high power lights, it has been found that these are occasionally and unintentionally turned on when connected to the electrical power supply in the folded state. The extreme heat generated by the high-power bulbs can damage the screen.

The invention has for its object to provide a portable lamp available, which can not be destroyed by heat damage.

The object according to the invention is achieved in that at least one device is provided which monitors the tensioned state of the folding screen and / or the temperature of the lighting means and at least one of the devices locks the clamping means of the folding screen as a function of the temperature of the lighting means. Further advantageous embodiments will become apparent from the dependent claims.

A safety device which prevents the simultaneous relaxation of the tensioning mechanism and warm phase of the lamp, ensures that the portable lamp can not be destroyed by heat damage, so that the lamp can not be turned on in the relaxed state of Faltschirms or relaxation of the folding screen can be done after heating , This results in the advantage that an inadvertently energized light bulb does not destroy the folding screen by heat.

According to the invention, one of the elements of the clamping means in the relaxed state of the folding screen trigger an electrical breaker.

The safety device according to the invention may be a circuit breaker, which is arranged in the portable lamp, that this is triggered by a movable element of the clamping means in the relaxed state. Thus, the power supply of the lamp is interrupted in this case. Preferably, the breaker is designed so that it closes the circuit only in the fully tensioned state of the folding screen. This prevents the light bulb from destroying an incompletely tensioned screen when switched on prematurely.

However, the device according to the invention is not limited to a power interruption, which prevents the light source can be turned on in the relaxed state of the folding screen, but may also be a device that by the light itself, for example by heating by the light source, prevents the Clamping means can be relaxed.

It has proven to be advantageous to use an element for locking the folding screen in the tensioned state, which locks the clamping means of the folding screen in the heated state solely by thermal expansion. It would also be possible, for example by an electromagnet, to lock the folding screen in the tensioned state, wherein the electromagnet locks the folding screen during the switch-on phase of the lighting means by means of a locking mechanism. An element which locks but only by thermal expansion, but has the advantage that this only then releases the lock when the lamp of the folding screen is cooled again. The cooling phase can take a few minutes and longer, possibly even 15 minutes and longer, during which cooling phase, no electricity is available, which could provide an electrical interlock.

An element which locks the clamping means of the folding screen by the thermal expansion, thus has the advantage that this is independent of a power supply, for example, after switching off the lamp.

The locking device consists advantageously of two mutually encompassing elements, which are made of different materials, wherein the material of the first element has a different thermal expansion coefficient than the material of the second element. This ensures that in the device two elements which at ambient temperature, for example, outside temperature, can slide past each other, but in the heated state lock each other by the different thermal expansion coefficient. In this locked state, the two elements jam and only become detached after cooling has taken place.

In a first exemplary embodiment of the invention, the device consists of a piston sliding in a hollow cylinder, wherein the material of the piston has a higher coefficient of thermal expansion than the material of the hollow cylinder. In this embodiment of the invention, the piston slides inside the hollow cylinder during tensioning of the folding screen along. If the piston is made of brass, for example, which has a higher coefficient of expansion than stainless steel, and the hollow cylinder is made of stainless steel, so the brass piston, which slides in stainless steel hollow cylinder, after heating no longer be moved in this, as the brass piston through Expansion in the less expansive stainless steel hollow cylinder jammed.

However, the device according to the invention is not limited to a piston which slides in a hollow cylinder. It is also possible that the heat-released locking device is a ring sliding on a rod. It has proven to be advantageous if the material of the ring has a lower coefficient of thermal expansion than the material of the rod, which locks by heating the rod in the sliding ring.

Instead of a device which slides against each other or into one another, a locking device can be used, for example, at the same time locks the screen as a normal locking element in the tensioned state, this locking element in turn stops by a locking element of a manual unlocking. It is for example possible that a bimetal, which in the cold

Condition is arranged so that it does not protrude into the clamping path of a clamping means, after expansion or after deformation by heat protrudes into the clamping path of a locking element. Examples include here a locking mechanism, as it is found in umbrellas, wherein a bimetal is disposed within a rod in the clamping mechanism, which engages when heated in a latch bolt in the form of a recess of the central clamping element of the clamping mechanism. Only after the bimetal has cooled down again and thus indicates the cooling of the entire arrangement, it is possible to unlock the folding screen of the lamp according to the invention again and relax.

According to the invention, the locking element can be held stationary, wherein the locking element locks another manual locking element, so that the actual locking element can not be triggered manually. But it is also possible that the locking element according to the invention itself inhibits or blocks the movement of the clamping means.

According to the invention, however, the locking element can also be arranged on a movable tensioning element, the locking element projecting in the heated state into a corresponding latching catch. A latch bolt may in this case be a recess in an element of the clamping device, wherein the latch bolt is arranged so that when the locking member projects into the latch bolt, the clamping device can not be relaxed because the locking element prevents the lateral movement of two elements in the tensioning device ,

Advantageously, the lamp according to the invention has at least one locking means which locks the screen in the incompletely tensioned state against relaxation, but opens against further tension of the tensioning mechanism. This ensures that when manually cocking the screen, which may require a lot of effort, can be temporarily reduced to rest, the screen then not back, due to its own resilience, back again.

Advantageously, a tensioning aid is provided especially for larger screens, which reduces the force required to tension the screen, wherein the clamping means may be a pulley, a deflected rope or a transmission. By the tension help is achieved that also a larger screen with relative little effort can be stretched, of course, extends the manual tensioning path by the tensioning aid. A tensioning aid may be a pulley, with the mechanical clamping of the clamping means by deflected ropes. But it is also possible that the tensioning aid is a gear which drives a winding roll, which is itself connected to a first end of the clamping means and a pull rope or a cable wound, which is connected to a second end of the tensioning means. When the gear drives this winding roll, the path between the two clamping means shortened by the train of the winding roll and so the clamping means are tensioned. The gear facilitates the rotation of the winding roll, in which via a corresponding translation, the torque for rotating the winding roll is lowered. But it is also conceivable to use a rack and pinion gear for tensioning the clamping means.

Advantageously, the tensioning aid and the locking means are present in one unit. It is conceivable to provide both the tensioning aid and the locking means as individual or as separate mutually independent units within the luminaire. Advantageously, however, the tensioning aid and the locking means are combined in one unit. This has the advantage that the locking means can lock the clamping aid directly and a lock is not made via different paths within the lamp.

As a preferred embodiment of a lamp with a tensioning aid and a locking means is a lamp which winds a drawstring or a cable, wherein the winding roll is connected to a first end of the clamping means and the drawstring or the cable to a second end of the clamping means and the roll through a torsion spring tensioned the drawstring or the cable during tensioning of the clamping means and thereby prevents unwinding of the drawstring or the cable by a locking means and allows the relaxation of the folding screen only by releasing the lock.

The tensioning aid can be designed such that the ratio of the tensioning path and the manual triggering path is reversed relative to the above-mentioned embodiments. As a result, the torque required for clamping the clamping means or the force required for clamping is increased. At the same time, the trip path is shortened. This embodiment is particularly useful for lights whose tensioning screen can be tensioned with even little effort. The advantage is that a manual pull rope has to be pulled a very short way. When As a result, the pull rope does not hang down. A long, drooping pull rope could knock in the wind, it could come with. Knot cables or otherwise hang unfavorably and uncontrollably, which is perceived for lights in practical use, especially in emergencies as very disadvantageous.

The invention will be explained below with reference to the following figures.

Fig. 1

eine erfindungsgemäße transportable Leuchte mit Spannmittel,

Fig. 2

eine Spannhilfe für die erfindungsgemäße Leuchte,

Fig. 3

eine erweiterte Spannhilfe für die erfindungsgemäße Leuchte,

Fig. 4

die erweiterte Spannhilfe auf Figur 3 in zerlegter Form,

Fig. 5

eine erfindungsgemäße Bimetallverriegelung im erwärmten und erkalteten Zustand,

Fig. 6

eine weitere Wärmeverriegelung und

Fig. 7

einen erfindungsgemäßen Unterbrecherkontakt.

It shows

Fig. 1

a transportable lamp according to the invention with clamping means,

Fig. 2

a tensioning aid for the luminaire according to the invention,

Fig. 3

an extended tensioning aid for the luminaire according to the invention,

Fig. 4

the extended clamping aid on FIG. 3 in disassembled form,

Fig. 5

a bimetallic lock according to the invention in the heated and cooled state,

Fig. 6

another heat lock and

Fig. 7

a breaker contact according to the invention.

In FIG. 1 a tensioning device 1 for a portable light 500 according to the invention is shown, which biases a folding screen 300. The tensioning device 1 consists of a telescopic rod 2 with inner telescopic rods 3, 3 'and outer, in FIG. 1 transparent drawn telescopic sleeves 4, 4 ', which are arranged one inside the other. At a first end of the telescopic rods 3, 3 ', which are located within the telescopic sleeves 4, 4', there are each piston 5, 5 ', which are formed in this example of brass. The telescopic sleeves 4, 4 ', however, are made of stainless steel. The telescopic linkage 2 ends at its outer ends in each case in a clamping ring 6, 6 ', to which clamping means 9, 9' are fixed and are clamped by the clamping rings 6, 6 '. At the Teleskophülsen 4, 4 'is a lamp holder 7 is arranged, which receives the lamp 8, which is powered by a supply cable 10 with electrical power. In FIG. 1 the tensioning device 1 is shown in the tensioned state for the transportable lamp according to the invention, the telescopic linkage 2 and the pistons 5, 5 'located therein being heated by the heat of the illuminant 8. Due to a higher expansion coefficient of the pistons 5, 5 ', these expand more than the inner diameter of the telescopic sleeves 4, 4'. Since the pistons 5, 5 'expand more, they jam in the telescopic sleeves 4, 4'. In the cooled state, the pistons 5, 5 'pull together again and thus release the jamming between the telescopic sleeves 4, 4' and the pistons 5, 5 ', so that the telescopic rods 3, 3' again without resistance from the telescopic sleeves 4, 4 ' move out and thus the tensioning means 9, 9 'can relax. Upon relaxation of the tensioning device 1, the distance between the clamping device rings 6, 6 'and thus move the clamping means 9, 9' equatorial in the direction of the bulb 8 to form a cylindrical arrangement of the clamping means 9, so that the portable light can be transported to save space ,

The bulb holder 7 is mounted on a support rod 140 of a stand 141. A Zugseilpaar 150, 151 'is attached to the piston 5, 5' and guided by the telescopic sleeves 4, 4 '. A handle 150 connects the two traction cables 151, 151 'with each other. When the lamp is mounted on the stand 141, possibly at a height of a few meters, a manual pull on the pull handle 150 enables a tensioning of the tensioning device 1 in which the telescopic rods 3, 3 'are pulled into the telescopic sleeves 4, 4' and the upper clamping ring 6 Pull down in the direction of the arrow. As a result, the upper clamping ring 6 approaches the lower of the bulb socket fastened clamping ring 6 'and thereby the clamping means 9, 9' move outwards, as indicated by the arrows, whereby a spanned over the clamping means 9, 9 'luminescent screen spans.

In FIG. 2 a tensioning aid 100 is shown, which also serves as a locking means for locking the tensioning device 1. In this specific embodiment of the tensioning aid 100, the tensioning aid 100 consists of a winding roller 101 about which the pull cable 151 'in FIG. 1 is wound and above the winding roll 100 leaves them again as pull 105. The pull cable 105 is connected to the piston 5 'in FIG. 1 connected. The winding roller 101 has a brake drum 103. In the brake drum 103 is an intake brake 102, which prevents unwinding of the drawstring or the cable 105. Turns the tensioning aid 100 in the FIG. 2 counterclockwise, so the infeed brake 102 prevents unwinding in a clockwise direction, because the inlet brake 102 locks within the brake drum 103. On the other hand, counterclockwise winding allows the inlet brake 102, so that the tensioning aid 100 can wind up the tension band or the cable 105 without resistance. For safe winding of the drawstring or the cable 105 is an optional torsion spring 104, which gives the clamping aid 100 so much torque that it winds the drawstring or the cable 105 against its own rigidity. The torsion spring 104 is not primarily intended to serve as Spannkrafterleichterung, but it is possible here to install such a strong torsion spring 104, thereby tightening the clamping device 1 in FIG. 1 is relieved. To release the tensioning aid 100, the inlet brake 102 is lifted off the brake drum 103 with the aid of the trigger 160, so that the tensioning aid 100 by unwinding the winding roller 101, the tensioning device 1 in FIG. 1 allows. For better accessibility can be attached to the trigger 160, not shown here thread. In an alternative embodiment of the intake brake this is constructed as a blind-lock, so that the inlet brake 102 by briefly actuation of the winding roll 100 releases its locking and thereby the relaxation of the clamping means 9, 9 'in FIG. 1 allows. In a particular embodiment of the inlet brake 102 does not completely solve this, but brakes a movement of the winding roll 100, so that a relaxation of the clamping means 9, 9 'does not happen suddenly, but slowly. As a result, accidents can be avoided.

In FIG. 3 an expanded tensioning aid 200 is shown, which in addition to the previously described tensioning aid 100 another winding roller 110 on a common Has axis 90, wherein the winding roller 110 has a reversed to the clamping aid 100 or the same winding direction. This additional roller 110 with wrong or same sense of winding serves to receive a pull cable 111, which can be actuated by a handle 112. If the pulling cable 111 is pulled by the handle 112, then the winding roller 110 is unwound and, at the same time, the tensioning aid 100 wraps itself up and thereby shortens the path of the drawstring or of the cable 105 within the tensioning device 1 FIG. 1 , As a result, the clamping device 1 spans in FIG. 1 because the path between the clamping rings 6, 6 'shortens.

In a particular embodiment of the invention can be provided that the roller 110 and the tensioning aid 100 are connected to each other in the extended tensioning aid 200 via a planetary gear 109, so that the roller 110 during unwinding rotates faster than the tensioning aid 100 during clamping. As a result, a torque gain in the transmission of drawstring 111 to drawstring or cable 105 is achieved, which means a greater ease, especially for large lights with a correspondingly large clamping device 1. Alternatively or in combination, the winding roller 110 may also have a square in its axial center, in which a crank 113 can be inserted for manual actuation of the crank. As when pulling on the drawstring 111 by the handle 112 can be achieved by turning the crank 113 that the tensioning aid 100, the drawstring or the cable 105 winds and thereby the tensioning device 1 in FIG. 1 stressed.

In exactly opposite manner, the planetary gear 109 can also couple the tensioning aid 100 and the winding roller 110 in such a way that the pulling path of the tension band 111 is shortened relative to the pulling path of the tension band or cable 105. This type of coupling is suitable for luminaires whose tensioning device 1 can be tensioned with little force. By Zugwegverkürzung it is achieved that the drawstring 111 does not protrude so far from the tensioning aid 200 after tensioning and thus hangs down unfavorably from the lamp.

In FIG. 4 is the clamping aid 200 off FIG. 3 shown in disassembled form, with a plan view of the tensioning aid 100, the open planetary gear 109 and the winding roller 110 is given. The tensioning aid 100 is identical to the tensioning aid except for its seat on the common axis with the planetary gear 109 FIG. 2 , Depending on the desired lower or translation tensioning aid 100 is coupled to the sun gear 106 of the planetary gear 109 or meshes with a not shown internal teeth on the rear side of the tensioning aid 100 with the three planet gears 107, 107 ', 107 "of the planetary gear 109. Accordingly, the winding roller 110 engages the sun gear 106 or the planetary gears 107, 107', 107" at. When pulling on the drawstring 111 by handle 112, the winding wheel 110 moves in the counterclockwise direction. If the winding roller is connected to the sun gear 106 of the planetary gear 109, then the central sun gear 106 meshes with the three planet gears 107, 107 ', 107 " Planetary gear 109. As a result, the three planetary gears mesh 107, 107 ', 107 "clockwise against the sun gear 106 and the three planetary gears 107, 107', 107" mesh against an internal toothing, not shown here, which on the rear side of the tensioning aid, not shown here 100 is arranged. As a result, the tensioning aid 100 also rotates in the clockwise direction, so that the tension band or the cable 105 is wound up. Since the sun gear 106, which is connected to the winding roller 110 on the axis, must rotate several times, so that the tension roller 100 performs a revolution, the torque which is applied to the tensioning aid 100 for clamping the tensioning device 1 in FIG. 1 is required, reduced when transferred to the winding roll 110. Is the winding roller 110 is not connected to the axis of the sun gear 106, but meshes with a not shown internal teeth on the back of the winding roller 110 to the three planetary gears 107, 107 ', 107 "and the clamping device 100 on the axis of the sun gear 106 of Connected to the planetary gear 109, so the torque ratio turns around, which leads to the advantages set out above.

In FIG. 5 is an inventive locking assembly 11 for the telescopic rod 2 of a portable lamp FIG. 1 shown. The locking arrangement 11 is arranged within a telescopic linkage 2, which here consists of a telescopic rod 12 and a telescopic sleeve 13. On a bolt axis 14, which is arranged within the telescopic rod 12, there is a bolt 15, which is pulled by a locking spring 16 into the interior of the telescopic rod 12. On a bimetallic bearing 17, a bimetal 18 is arranged, which curves in the heated state and thus pushes against the train of the locking spring 16, the bolt 15 to the outside. In the cocked position of the telescopic linkage 2, the bolt 15 can protrude from a recess 19 in the telescopic sleeve 13 and thus prevent the expansion of the telescopic linkage 2. In the right picture of the FIG. 2 the same locking arrangement 11 is shown, but wherein the bimetal 18 in the cooled state has a different shape and thus the Bar spring 16 pulls the latch 15 in the interior of the telescopic rod 12. The bolt 15 thus clears the way for an expansion of the telescopic linkage 2, so that the inner telescopic rod 12 can slide within the telescopic sleeve 13.

In FIG. 6 is a further embodiment of the locking assembly 11 for the telescopic rod 2 of a portable lamp FIG. 1 shown. Instead of a bimetal, which pushes into a latch bolt, it is also possible to perform the locking arrangement by a brass cylinder 170, which is slipped over an inner telescopic rod 12 and slides in the telescopic sleeve 13. When heated, the brass cylinder 170 expands within the telescopic sleeve 13 and thus jammed, whereby the telescopic rod 12 can no longer slide within the telescopic sleeve 13. Upon cooling, the brass cylinder 170 retracts within the telescoping sleeve 13 and clears the path for sliding the telescoping sleeve 12 within the telescoping sleeve 13.

In FIG. 7 an interruptor arrangement 20 according to the invention for a telescopic rod 2 of a portable lamp is shown. In the tensioned state, a recess 21 is arranged under a breaker contact 22, that a shoe 23 can connect a supply line 24 to form an electrical contact between contacts 25 and contact rod 26. The shoe 23 is disposed on a contact rod 26 and rotates about an axis 27 which is disposed in the breaker housing 28. A sliding shoe spring 29 presses the sliding block 23 in the direction of the recess 21 of the telescopic rod 12. If the telescopic linkage 2 is extended or retracted, the sliding block 23 is moved into the interior of the interrupter housing 28 by the displaced recess 21 and the contact between the contact rod 26 becomes and contact 25 is opened, so that the supply line 24 is electrically interrupted.

LIST OF REFERENCE NUMBERS

1

jig

2

telescopic boom

3

telescopic rod

4

Telescopic sleeve / hollow cylinder

5

piston

6

clamping ring

7

Lamp holder

8th

Lamp

9

clamping means

10

power cable

11

lock assembly

12

telescopic rod

13

telescopic sleeve

14

latch axis

15

bars

16

latch spring

17

Bimetalllager

18

bimetallic

19

recess

20

Breaker arrangement

21

recess

22

Breakpoint

23

shoe

24

supply line

25

Contact

26

contact rod

27

axis

28

Breaker housing

29

Gleitschuhfeder

90

axis

100

cocking aid

101

reel

102

inlet brakes

103

brake drum

104

torsion spring

105

Tieback / Cable

106

sun

107

planet

107 '

planet

107 '

planet

108

mounting assembly

109

planetary gear

110

reel

111

rope

112

Handle

113

crank

140

tripod

141

Support rod

150

Pull

151

rope

151 '

rope

160

trigger

161

Brake shoe bearing

170

brass cylinder

200

cocking aid

300

folding screen

500

lamp

Claims (11)

1. Lamp (500) with a folding shade (300) at least partially provided with a reflecting layer, wherein at least one movable tensioning means (2, 9) is provided to stretch the folding shade (300) and the folding shade (300) encloses an illuminant (8),
   characterized in that
   at least one device (11, 20) is provided which monitors the taut state of the folding shade (300) and/or the temperature of the lamp (8), and at least one of the devices (11, 20) adjusts the tensioning means (2, 9) of the folding shade (300) in dependence to the temperature of the lamp (8).
2. Lamp (500) according to claim 1,
   characterized in that
   at least one of the devices (11, 20) interrupts an electric power supply of the illuminant (8) in dependence to the taut state of the tensioning device (1).
3. Lamp (500) according to one of claims 1 or 2,
   characterized in that
   the device (11, 20) comprises an element (5, 5') which adjusts a tensioning means element (3) of the tensioning means (2, 9) by thermal expansion.
4. Lamp (500) according to one of the preceding claims,
   characterized in that
   the device (11, 20) consists of two elements (4, 4', 5, 5') encompassing each other and being made of different materials, the material of the first element (4, 4') having a thermal expansion coefficient different from that of the second element (5, 5').
5. Lamp (500) according to claim 4,
   characterized in that
   the device (11, 20) is a piston (5, 5') sliding in a hollow cylinder (4, 4'), whereby the material of the piston (5, 5') having a thermal expansion coefficient that is higher than that of the material of the hollow cylinder (4, 4').
6. Lamp (500) according to one of the preceding claims,
   characterized in that
   the device (11, 20) is a ring sliding on a rod (3, 3').
7. Lamp (500) according to one of the preceding claims,
   characterized in that
   at least one element (2) of the tensioning means (9) is locked by a locking element (15), the locking element (15) projecting into the otherwise free tension path of the element (2) of the tensioning means (9) due to the thermal expansion.
8. Lamp (500) according to claim 7,
   characterized in that
   the locking element (15) is stationarily held and blocks or stops the movement of the tensioning means (2, 9).
9. Lamp (500) according to one of claims 7 and 8,
   characterized in that
   the locking element (15) is arranged on the tensioning element (2) and projects into a corresponding latch catch in a heated state.
10. Lamp (500) according to one of the preceding claims,
    characterized in that
    at least one element (21) of the tensioning means (2, 9) activates an electric circuit breaker (20) in a non-stressed state.
11. Lamp (500) according to one of claims 1 to 6,
    characterized in that
    a tension aid (100, 200) is provided which changes the expenditure of force for tensioning the tensioning device (1), the tensioning means (100, 200) comprising a pulley block (100), a deflected rope (105) or a gearing (109).

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