JP4451883B2 - 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 present invention is a lamp comprising a foldable shade that is at least partially coated with a reflective layer and is provided with one or more movable stretching means, the stretching means comprising a foldable shade And the foldable shade relates to a lamp that surrounds the illumination means in the extended and unstretched state.

  Lamps with folding shades are known as handheld lamps or stand lamps and are preferably used to illuminate a space or outdoor surface for a limited time. Depending on the intended use, it may be a low power lamp or a power lamp of up to 1000 watts or more. In the case of the latter lamp, it is preferably used outdoors, for example for lighting in the case of construction sites, accident sites, large-scale disaster areas, or sporting events.

For example, from EP 1059483 , a portable lamp is known in which the lampshade is stretched by an extension mechanism. As a special feature of this configuration, it can be noted that the lamp shade almost completely surrounds the illumination means. When using such portable lamps, especially when using high power lamps, such lamps are switched on with the shade folded when connected to the power supply. It has been found that this often happens and happens inadvertently. Here, if very high-temperature heat is generated by the high-power illumination means, the lamp shade may be damaged.

  The object of the present invention is to provide a portable lamp having the advantages of European patent EP 1059483. However, this lamp is provided with a device that prevents the extension mechanism from being extended and that the illumination means is not heated at the same time and that it can be easily extended. And

An object of the present invention is to provide at least one device, which is adapted to monitor the extension state of the foldable shade and / or the temperature of the illumination means, and is an extension aid. An extension aid adapted to change the consumption of force for extending the extension device, the extension means comprising a pulley device, a redirected rope or a gear mechanism It is solved by becoming. Further preferred embodiments emerge from the dependent claims.

  A safety device that prevents the unstretching mechanism from being unstretched and the lighting means to be in the warming stage at the same time prevents the portable lamp from being destroyed by thermal damage, so that the lamp Will not be switched on in the unfolded state of the foldable shade, or the foldable shade cannot be unstretched after it has been warmed. This provides the advantage that the foldable shade is not destroyed by the generation of heat by the lighting means being inadvertently energized.

For a relatively large illumination shade, it is particularly preferable to provide an extension aid. This extension aid reduces the amount of power consumed to extend the shade. In this case, the extension means can be a pulley device, a redirected rope, or a gear mechanism. With the extension aid, even a relatively large shade can be extended with a relatively small amount of power consumption. In this case, of course, the manual extension path is extended by the extension aid. The extension aid can be a pulley device. In this case, the extension means is mechanically stretched by the rope whose direction is changed. However, the extension assisting tool can be a gear mechanism. The gear mechanism drives a winding roll, which is connected to the first end of the stretching means and winds a traction rope or cable connected to the second end of the stretching means. When the gear mechanism drives the winding roll, the path between the two stretching means is shortened by pulling the winding roll, whereby the stretching means is stretched. In this case, the gear mechanism facilitates the rotation of the winding roll by transmitting the corresponding speed and reducing the rotational torque with respect to the rotation of the winding roll. However, it is also conceivable to use a rack and pinion gear mechanism to extend the extension means.

  Desirably, the extension aid and the restraining means are present in one unit. It can also be envisaged that the extension aid and the restraining means are provided in the lamp as separate or independent aggregates. However, it is preferable that the extension aid and the restraining means are integrated in one unit. This has the advantage that the restraining means can directly restrain the extension aid and is not constrained via different paths in the ramp.

A preferred embodiment of a ramp comprising an extension aid and restraining means is a ramp that winds a traction band or cable. In this case, the winding roll is connected to the first end of the stretching means and the traction band or cable is connected to the second end of the stretching means. In addition, the roll is stretched by a torsion spring, and when the stretching means is stretched, the roll is wound around the traction band or the cable. The extension of the foldable shade can be released only by releasing the restraining means .

  According to the invention, one of the elements of the extension means can activate the electric circuit breaker in the unstretched state of the folding shade.

  In a further advantageous embodiment of the invention, the extension aid is configured such that the ratio of the extension path to the manual actuation path is opposite to that described above. By doing so, the rotational torque required to extend the extension means or the force required to extend it is increased. At the same time, the operating path is shortened. This embodiment is particularly practical for lamps where the extension shade is sufficiently extensible with relatively little force. In this case, there is an advantage that the manual pulling rope only needs to be pulled by a very short path. As a result, the tow rope does not hang down. A tow rope that hangs down for a long time may be blown by the wind and swaying around, wrapping around the cable and forming a knot, otherwise it may hang down inconveniently and out of control. This appears to be very inconvenient for actual use, especially for lamps in emergency situations.

  The safety device according to the present invention may be a current breaker. This current breaker is provided in the portable lamp so as to be actuated by the movable element of the stretching means in the unstretched state. Therefore, in this case, power supply to the illumination unit is interrupted. The circuit breaker is preferably configured to close the electrical circuit only after the foldable shade is fully extended. This prevents the lighting means from being switched on prematurely and thus destroying a shade that is not fully extended.

  However, the device according to the invention is not limited to a current breaker that prevents the lighting means from being switched on in the extended state of the folding shade. The device according to the invention can also be a device that prevents the stretching means from being unstretched by the lighting means itself, for example by heating by the lighting means.

  In order to constrain the foldable shade in the extended state, it has been found to be advantageous to use elements that constrain the foldable shade extension means in the warmed state only by thermal expansion. For example, the folding shade can be constrained in an extended state by an electromagnet. At that time, the electromagnet constrains the foldable shade by the bolt mechanism while the illumination means is switched on. However, the element constrained only by thermal expansion has the advantage that the restraint is released only after the illuminating means of the foldable shade is completely cooled again. In this case, the cooling phase can last several minutes or longer, and in some cases can last as long as 15 minutes or more. During this cooling phase, the power that the electronic lock can supply is not supplied. Therefore, the element that constrains the extension means of the folding shade by thermal expansion has the advantage that it does not depend on the presence or absence of power supply after switching off the illumination means, for example.

  The restraining device preferably consists of two elements that are made of different materials and that are umgreifend to each other. Here, the material of the first element has a different coefficient of thermal expansion than the material of the second element. This allows the two elements to slide in contact with each other at ambient temperature, for example, outside temperature, in the device, but because of their different coefficients of thermal expansion, they will lock together in the warmed state. Is achieved. In this locked state, the two elements are stuck to each other, and this stuck state is released only after the element is completely cooled.

  In a first exemplary embodiment of the invention, the device consists of a piston that slides inside a hollow cylinder. In this case, 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 along the interior of the hollow cylinder as the foldable shade is extended. For example, if the piston is made of brass with a higher coefficient of thermal expansion than special steel and the hollow cylinder is made of special steel, the brass piston slides along the inside of the special steel hollow cylinder Cannot be moved inside the hollow cylinder after being heated. The reason is that the brass piston sticks inside the special steel hollow cylinder which is not so expanded by expanding.

  However, the device according to the invention is not limited to a piston sliding inside a hollow cylinder. It is also possible that the heat actuated restraining device is a ring that slides over the bar. In this case, it has proved advantageous for the ring material to have a lower coefficient of thermal expansion than the bar material. In this case, the bar is constrained in the sliding ring by heating.

  Instead of devices that slide in contact with each other or ineinander with each other, bolt devices can also be used. This bolt device, for example, restrains the shade in an extended state together with a normal bolt element. The bolt element is then not manually unlocked by the locking element. For example, the bimetal portion provided so as not to protrude into the extension path of the extension means in the cooled state can be provided so as to protrude into the extension path of the bolt element after being expanded, for example, after being deformed by heat. is there. An example here is a bolt mechanism as used in an umbrella. In this bolt mechanism, a bimetal part is provided inside the rod of the extension mechanism, and when this bimetal part is heated, it fits into a latch catch in the form of a notch part of the extension element in the center of the extension mechanism. It has become. Only after the bimetal part is completely cooled again and the entire structure is completely cooled, can the foldable shade of the lamp of the invention be unlocked again and unstretched.

  According to the invention, the locking element can be held stationary. Here, the locking element can lock other manual locking elements, so that the original locking element cannot be manually activated. However, it is also possible for the locking element according to the invention itself to prevent or lock the movement of the extension means.

  However, according to the invention, the locking element can also be provided on a movable extension element. Here, the locking element protrudes into the corresponding latch catch in a heated state. In this case, the latch catch may be a notch provided in an element of the extension device. The latch catch is provided so that the extension device cannot be unstretched when the locking element protrudes into the latch catch. The reason is that the locking element prevents lateral movement of the two elements in the stretching device.

  The lamp according to the invention advantageously has at least one restraining means. This restraining means restrains the shade from being unstretched in an incompletely stretched state, but allows the shade to expand when the stretching mechanism further stretches. As a result, when the shade is manually extended, a large amount of force is required in some cases, but the manual extension can be stopped for a short period of time, and the shade can be stopped. It is achieved that the tension does not suddenly return due to its own tension.

Furthermore, according to the present invention, a device for monitoring the extension state of the folding shade and / or the temperature of the illumination means is provided independently of the extension aid. The extension aid changes the amount of force consumed to extend the extension device, wherein the extension means comprises a pulley device, a redirected rope, or a gear mechanism.

Hereinafter, the present invention will be described with reference to the accompanying drawings.

  FIG. 1 shows a stretching device 1 for a portable lamp 500 according to the present invention. This expansion device expands the foldable shade 300. The stretching device 1 comprises a telescopic bar assembly 2. This telescopic rod includes inner telescopic rods 3, 3 'and outer telescopic cases 4, 4' shown transparently in FIG. The telescopic rod and the telescopic case are provided so as to be nested with each other. At the first ends of the telescopic bars 3, 3 'inside the telescopic cases 4, 4', there are pistons 5, 5 'formed from brass in this example, respectively. On the other hand, the elastic cases 4, 4 'are made of special steel. The outer ends of the telescopic bar assembly 2 are terminated by extension rims 6 and 6 ', respectively. Extension means 9, 9 'are fixed to the extension rim, and these extension means are stretched by extension rims 6, 6'. An illuminating means mount 7 is provided on the telescopic cases 4 and 4 ′. The illumination means mount accommodates the illumination means 8, and power is supplied to the illumination means by a power cable 10. FIG. 1 shows a stretching device 1 for a portable lamp according to the invention in a stretched state. Here, the heat of the illumination means 8 heats the telescopic rod assembly 2 and the pistons 5, 5 ′ therein. The pistons 5 and 5 'have a high expansion rate, so that the pistons 5 and 5' expand more than the inner diameter of the telescopic cases 4 and 4 '. Since the pistons 5 and 5 'expand more strongly, the pistons 5 and 5' are stuck inside the telescopic cases 4 and 4 '. The pistons 5 and 5 ′ are contracted again in the cooled state, thereby releasing the stuck state between the expansion / contraction cases 4 and 4 ′ and the pistons 5 and 5 ′. As a result, the telescopic bars 3, 3 'can be moved again from the telescopic cases 4, 4' without resistance, so that the stretching means 9, 9 'can be released. When the extension device 1 is released from the extension, the distance between the extension means rims 6 and 6 'increases, so that the extension means 9 and 9' are illuminated while forming a configuration in which the extension means 9 is cylindrical. Since it moves in the equator direction relative to the means 8, the portable lamp can be transported without taking up space.

The illumination means mount 7 is fixed on the stand rod 141 of the stand 141. Tow ropes 150 and 151 ′ are fixed to the pistons 5 and 5 ′, and pass through the telescopic cases 4 and 4 ′. The tow ropes 151 and 151 ′ are connected to each other by the handle 150. If the ramp is installed on the stand 141, possibly at a height of several meters, the extension device 1 can be extended by manually towing the tow handle 150. At this time, the telescopic rods 3, 3 ′ are drawn into the telescopic cases 4, 4 ′, and the upper extension rim 6 is pulled downward in the direction of the arrow. This causes the upper rim 6 to approach the lower extension rim 6 'secured to the illumination means mount so that the extension means 9, 9' move outward as indicated by the arrows. As a result, the lamp shade that has been folded back on the extension means 9, 9 'is stretched.

FIG. 2 shows the extension assisting tool 100. This extension assisting tool functions as a restraining means for restraining the stretching device 1. In this specific embodiment of the stretching aid 100, the stretching aid 100 comprises a winding roll 101. The tow rope 151 ′ of FIG. 1 is wound around the winding roll, and the tow rope is separated from the winding roll again as the tow rope 105 above the winding roll 100 . The tow rope 105 is connected to the piston 5 'in FIG. The winding roll 101 includes a brake drum 103. The brake drum 103 has an unwinding brake 102 that prevents the traction band or cable 105 from unwinding. When the extension assisting tool 100 of FIG. 2 rotates counterclockwise, the unwinding brake 102 prevents unwinding in the clockwise direction. This is because the unwinding brake 102 is locked inside the brake drum 103. On the other hand, the unwinding brake 102 makes it possible to wind up counterclockwise, so that the extension assisting tool 100 can wind up the traction band or the cable 105 without resistance. An optional torsion spring 104 is used to safely wind the traction band or cable 105. This torsion spring provides the extension aid 100 with a number of rotational torques such that the extension aid 100 winds the traction band or cable 105 against its original stiffness. The torsion spring 104 is not originally envisioned as being used to relieve tension. However, in this example, a strong torsion spring 104 can be installed, thereby making it easier to extend the extension device 1 of FIG. In order to release the extension aid 100, the unwinding brake 102 is lifted from the brake drum 103 by the release device 160, whereby the extension aid 100 unwinds the winding roll 101, whereby the extension device 1 of FIG. The extension can be released. In order to facilitate the operation, a thread not shown here can be provided in the release device 160. In an alternative embodiment of the unwinding brake, the unwinding brake 102 is configured like a blind locking device, so that the restraint is released by operating the unwinding roll 100 for a short period of time. The decompression means 9, 9 'of 1 is released. In a special embodiment of the unwinding brake 102, the unwinding brake does not completely release the winding roll, but brakes the movement of the winding roll 100 , so that the unstretching of the stretching means 9, 9 ' It is done slowly. By doing so, accidents can be prevented.

  FIG. 3 shows an extended extension aid 200. This extension assisting tool is provided with a further winding roll 110 on the common shaft 90 in addition to the extension assisting tool 100 already described. Here, the winding roll 110 has a winding direction opposite to that of the stretching aid 100 or the same winding direction. This additional roll 110 having the opposite or the same winding direction is used to accommodate the tow rope 111. This tow rope 111 can be operated by a handle 112. When the tow rope 111 is pulled by the manual handle 112, the winding roll 110 unwinds and at the same time the stretching aid 100 winds, so that the path of the tow band or cable 105 in the stretching apparatus 1 in FIG. Shortened. As a result, the expansion device 1 of FIG. 1 expands because the path between the expansion rims 6 and 6 'is shortened.

  In a particular embodiment of the invention, the roll 110 and the extension aid 100 in the expanded extension aid 200 are connected to each other via a planetary gear mechanism 109 so that the roll 110 during unwinding is extended. It can be made to rotate faster than the stretching aid 100 at the time. This increases the rotational torque when transmitted from the traction rope 111 to the traction band or cable 105. This means that it is easier to operate with large lamps that are correspondingly larger in extension device 1. As an alternative or in combination with this, the winding roll 110 can also be provided with a square part in the center of the axis, into which the crank 113 can be fitted in order to manually operate the crank. The extension device 100 of FIG. 1 can be extended by winding the traction band or cable 105 by rotating the crank 113 in the same manner as when the traction band 111 is pulled by the manual handle 112. Achieved.

  In exactly the opposite manner, the planetary gear mechanism 109 can also connect the extension aid 100 and the winding roll 110 to shorten the traction path of the traction band 111 relative to the traction band or cable 105. . This type of connection is suitable for a lamp with a stretching device 1 that can be stretched without requiring too much force. By shortening the traction path, the traction band 111 does not protrude too far from the extension assisting tool 200 even after the extension is performed, and thus the traction band droops inconveniently from the ramp. Disappears.

  FIG. 4 illustrates the extension assisting tool 200 of FIG. 3 in an exploded state. In the figure, the extension assisting tool 100, the planetary gear mechanism 109 in the opened state, and the winding roll 110 are shown. The extension assisting tool 100 is the same as the extension assisting tool in FIG. 2 except for the seat position (Sitz) on the common axis with the planetary gear mechanism 109. The extension assisting device 100 is connected to the sun gear 106 of the planetary gear mechanism 109 by making a low speed gear or a high speed gear as desired. (Not shown here) is engaged with the three planetary gears 107, 107 ′, 107 ″ of the planetary gear mechanism 109. Correspondingly, the winding roll 110 is connected to the sun gear 106 or the planetary gears 107, 107 ′, 107 ″. To fit. When the traction band 111 is pulled by the handle 112, the winding gear 110 rotates counterclockwise. When the winding roll is connected to the sun gear 106 of the planetary gear mechanism 109, the sun gear 106 at the center of the planetary gear mechanism 109 meshes with the three planetary gears 107, 107 ′, 107 ″. , 107 ′, 107 ″ have a stationary shaft on the casing of the planetary gear mechanism 109. As a result, the three planetary gears 107, 107 ′, and 107 ″ mesh with the sun gear 106 in the clockwise direction, and the three planetary gears 107, 107 ′, and 107 ″ engage with the meshing portion (here, (Not shown). The internal meshing portion is provided on the back side of the extension assisting tool 100 which is not shown here. As a result, the extension assisting device 100 similarly rotates counterclockwise, and as a result, the traction band or cable 105 is wound up. Since the sun gear 106 connected on the axis with the winding roll 110 needs to be rotated a plurality of times in order for the stretching aid 100 to change direction, the stretching device 1 of FIG. 1 is stretched using the stretching aid 100. The rotational torque necessary for the reduction is reduced when it is transmitted to the winding roll 110. The winding roll 110 is not connected on the axis of the sun gear 106, but the three planetary gears 107, 107 ′, 107 are engaged by meshing portions (not shown here) provided on the back side of the winding roll 110. ”And when the expansion device 100 is connected on the axis of the sun gear 106 of the planetary gear mechanism 109, the rotational torque ratio is reversed, so that the advantages described above are obtained. Become.

  FIG. 5 illustrates a locking mechanism 11 according to the present invention for the telescopic rod assembly 2 of the portable lamp of FIG. The locking mechanism 11 is provided inside the telescopic bar assembly 2, and the telescopic bar assembly is composed of the telescopic bar 12 and the telescopic case 13 in this figure. A bolt shaft provided inside the telescopic rod 12 includes a bolt 15, and this bolt is pulled into the telescopic rod 12 by a bolt spring 16. The bimetal bearing 17 is provided with a bimetal portion 18, which is reduced in a heated state, thereby pressing the bolt 15 outward against the pulling of the bolt spring 16. When the telescopic bar assembly 2 is extended, the bolt 15 protrudes from the notch 19 of the telescopic case 13, thereby preventing the telescopic bar assembly 2 from expanding. In the right side of FIG. 2, a similar locking mechanism 11 is illustrated, but in FIG. 2, the bimetal portion 18 has another form in the cooled state, and thus the bolt spring 16 extends and contracts the bolt 15. The rod 12 is drawn inside. Therefore, the bolt 15 opens a path for the expansion / contraction bar assembly 2 to expand, and as a result, the internal expansion / contraction bar 12 can slide inside the expansion / contraction case 13.

  FIG. 6 shows a further embodiment of a locking mechanism 11 for the telescopic rod assembly 2 of the portable lamp of FIG. Instead of the bimetal part sliding into the latch catch, the locking mechanism can also be implemented by a brass cylinder 170. The brass cylinder is folded back by the inner telescopic rod 12 and slides in the telescopic case 13. When the brass cylinder 170 is heated, the brass cylinder 170 expands inside the expansion / contraction case 13, and therefore sticks inside the expansion / contraction case. As a result, the telescopic rod 12 cannot slide inside the telescopic case 13. When the brass cylinder 170 is cooled, the brass cylinder 170 contracts again inside the expansion / contraction case 13 and opens a path for the expansion / contraction rod 12 to slide inside the expansion / contraction case 13.

  FIG. 7 shows a circuit breaker mechanism 20 according to the present invention for a telescopic rod assembly 2 of a portable lamp. In the extended state, the notch 21 is below the break point 22 so that the shoe 23 can connect the power supply line 24 while the electrical contact between the contact 25 and the contact rod 26 is being formed. Is provided. The shoe 23 is provided on the contact rod 26 and rotates around the shaft 27. This shaft is provided in the circuit breaker casing 28. The shoe spring 29 presses the shoe 23 in the direction of the notch 21 of the telescopic rod 12. When the telescopic rod assembly 2 moves up and down, the telescopic rod assembly 2 enters the circuit breaker casing 28 by the shifted notch 21 of the shoe 23, and at that time, the contact between the contact rod 26 and the contact 25 is opened. As a result, the power supply line 25 is electrically cut off.

FIG. 4 shows a portable lamp according to the present invention comprising stretching means. It is a figure which shows the expansion | extension assistance tool for lamp | ramp by this invention. FIG. 3 shows an extended extension aid for a lamp according to the invention. It is a figure which decomposes | disassembles and shows the extended expansion | extension assistance tool of FIG. It is a figure which shows the bimetal locking device (Bimetallverriegelung) by this invention in a heating state and a cooling state. It is a figure which shows the further heating type rocking (Waermeverriegelung). It is a figure which shows the interruption | blocking point by this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Stretching device 2 Telescopic rod assembly 3 Telescopic rod 4 Telescopic case / hollow cylinder 5 Piston 6 Stretch rim 7 Illuminating means mount 8 Illuminating means 9 Stretching means 10 Power cable 11 Locking mechanism 12 Telescopic bar 13 Telescopic case 14 Bolt shaft 15 Bolt 16 Bolt Spring 17 Bimetal bearing 18 Bimetal part 19 Notch part 20 Breaker mechanism 21 Notch part 22 Break point 22 Break point 23 Shoe 24 Power supply line 25 Contact 26 Contact rod 27 Shaft 28 Breaker casing 29 Spring for shoe 90 Shaft 100 Extension aid DESCRIPTION OF SYMBOLS 101 Winding roll 102 Unwinding brake 103 Brake drum 104 Torsion spring 105 Traction band / cable 106 Sun gear 107 Planetary gear 107 'Planetary gear 107 "Planetary gear 108 Fixing mechanism 109 Planetary gear mechanism 1 10 winding roll 111 tow rope 112 handle 113 crank 140 stand 141 stand rod 150 tow handle 151 tow rope 151 'tow rope 160 release device 161 brake shoe pin bearing (Bremsbackenlager)
170 Brass cylinder 200 Extension aid 300 Folding shade 500 Lamp

Claims (13)

And at least partially reflective layer fold is subjected formula shade (300) Bei obtain lamp (500), the folding shade (300) for extending said collapsible shade (300) 1 One or more movable stretching means (2, 9) are provided, the foldable shade (300) enclosing the lighting means (8) in the stretched and unstretched state ;
At least one device (11, 20) is provided for monitoring the extension state of the folding shade (300) and / or the temperature of the lighting means (8);
A lamp characterized in that at least one of the devices (11, 20) restrains the extension means (2, 9) of the folding shade (300) according to the temperature of the illumination means (8). . At least one of the devices (11, 20) cuts off the supply of power to the illumination means (8) in accordance with a state relating to the stretching of the stretching device (1). The lamp described. 3. The device (11, 20) according to claim 1 or 2, characterized in that it comprises an element (5, 5 ') that restrains the stretching means element (3) of the stretching means (2, 9) by thermal expansion. The lamp described. The device (11, 20) consists of two elements (4, 4 ′, 5, 5 ′) that overlap each other, the elements being made from different materials, the first element (4, 4 ′) The lamp according to claim 1, wherein the material has a different coefficient of thermal expansion than the material of the second element (5, 5 ′). The device (11, 20) is a piston (5, 5 ′) that slides inside a hollow cylinder (4, 4 ′), and the material of the piston (5, 5 ′) is the hollow cylinder (4, 5 ′). 5. Lamp according to claim 4, characterized in that it has a higher coefficient of thermal expansion than the material of 4 ′). 6. Lamp according to any one of the preceding claims, characterized in that the device (11, 20) is a ring that slides on a bar (3, 3 '). At least one element (2) of the stretching means (9) is constrained by a locking element (15), said locking element (15) being open when not thermally expanded when thermally expanded 7. Lamp according to any one of the preceding claims, characterized in that it projects into the extension path of the element (2) of the means (9). 8. Lamp according to claim 7, characterized in that the locking element (15) is held stationary and prevents or locks the movement of the extension means (2, 9). 9. The locking element according to claim 7 or 8, characterized in that the locking element (15) is provided on the extension element (2) and projects into a corresponding latch catch (19) in the warmed state. The lamp described. 10. The at least one element (21) of the extension means (2, 9) actuates an electric circuit breaker (20) in the extension release state. lamp. 9. At least one restraining means (102) is provided, which restraining means restrains the stretching device (1) in an incompletely stretched state. The lamp described. 9. A lamp as claimed in any one of the preceding claims, characterized in that the extension aid (100, 200) and the restraining means (102) are present in one unit. There is provided an extension aid (100, 200) adapted to change the consumption of force for extending the extension device (1), and the extension aid (100, 200) is a pulley device. 13. Lamp according to claim 12, characterized in that it comprises a (100), a redirected rope (105) or a gear mechanism (109).

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