DE19805474C1 - Telescopic support strut for tent - Google Patents

Abstract

The support strut has a hand grip (16) movably spring mounted on a carrier block (15). The hand grip lever has a tell-tale pin (20) attached to the spring (17) to extend through an aperture in the lever in an overload situation.

Description

The invention relates to a telescopic support according to the preamble of the saying 1.

Telescopic supports are common in a variety of embodiments known and are used in many areas such. B. as tent supports, for support raising awnings, for height-adjustable tables and other objects, for shelf supports and for clamping between the floor and the ceiling a room and used as a jack. Next will be telescope support as an aid for the assembly of ceiling cladding, roof battens, Machine parts or the like used to facilitate this work or to enable it for one person at all.

All such telescopic supports consist of at least one or more Ren telescopic tubes and telescopic rods that are telescopic into each other are and can be locked in different extension lengths by locking means are. For example, a known telescopic support (US-3,734,441) arre by two actuatable locking plates to prevent it from being pushed in and out animals.

There are also telescopic supports with manually operated feed means in many embodiments are generally known, such being manually operated feed ratchets, racks, clamps or  the like can be. Such feeds with clamp brackets best hen in particular from an actuatable locking plate and a betä feedable plate through which a telescopic rod is guided and the spring loaded from a tilted locked position to a release position are feasible. The feed can also be in the tilted locked position plate together with the telescopic rod gradually in the direction of extension are adjusted, the locking plate ge in their release position is pressed. Such feeds are generally made of simple tools, such as known from cartridge presses. In connection with Te Lescope supports are generally from one embodiment of an earlier one widely used jacks (e.g. VW jacks) are known. At Telescopic supports as assembly aids are also manually operated cash feed means known (DE 296 05 222 U1; DE 296 01 103 U1).

On the one hand, such telescopic supports as assembly aids are intended to be of little use Have weight and be relatively inexpensive to manufacture. This requires that the telescopic support as a whole and the individual parts be only one limited, predetermined stability and damaged in the event of an overload and can be destroyed. This overload can be due to the relative great leverage with operational, strong manual operation in the Rule can be achieved, so that then the feed means destructive We the mechanical components and / or the pipes or Rods result. This can severely damage the telescope support in connection with a sudden yielding and running in and poses a significant risk of accidents if supported parts are used an overload control and damage to the telescopic support on one Fall users down.

A well-known telescopic support with gradual displacement by a Clamping mechanism from locking plate and feed plate (DE-27 20 948 A1) releases the problem of inadmissible overloading in that a pre  given, maximum extended end position of the feed out of on handle comes. Such an overload protection is only specified when it is fixed Extension paths possible against a stop and with telescopic supports as work aids with operationally different push-out options not usable.

Furthermore, automatically extending telescopic supports are known, in which in Prestress the telescopic tube inside when pushing the tubes together bare expelling agents are included. In a known embodiment (DE 40 36 970 A1) is a combination of ribbon springs and spiral compression springs used. In another known embodiment a gas spring that can be locked in different positions is used (DE 195 29 989 A1). In a generic embodiment (DE 29 60 5222 U1) is a combination of a manually operated Feed means for a gradual feed and a compression spring ver turns. The disadvantage here is that when the telescopic support is pushed together and preloaded compression spring the risk of automatic and unwanted This automatic feed is triggered and thereby one there is an increased risk of accidents.

With telescopic supports, it is also already known, on the two end sides To attach support feet and support plates partially interchangeably. Use te ball joints lead to problems with the stability of the tele scope support. Alternatively used screw connections for connection of specially shaped end parts with the telescopic support ends are only complex to change with a tool.

The object of the invention is to provide a telescopic support in which one Overload is recognizable and avoidable.  

This object is achieved with the features of claim 1 solved.

According to the characterizing part of claim 1, the handle is on Power transmission block movably mounted. The handle is also included coupled to the power transmission block by a spring element, that with a manual operation, the spring element with a size of Operating force corresponding deflection is deflected. At an un permissible overload of the telescopic support and / or components used corresponding to an overload actuating force on the handle at least part of the spring element has an associated spring travel threshold of an overload spring travel exceeded. After exceeding this travel threshold and the presence of an overload travel an overload signaling means activated as overload protection. This can the assigned relative position between a spring element part and the Handle or the power transmission block can be used. Dude natively or additionally, the assigned relative position between the power transmission block and the handle to determine a Overload travel can be used.

This advantageously ensures that the user of the telescopic support beginning overload is signaled with the request of the forward stop pushing the pushing device. This will damage conditions on the telescopic support and / or components used as well as with them associated risk of accidents for a user avoided, as if it occurs no critical overload has yet been reached.

For inconsiderate users who ignore this overload signaling, is in a continuation of the overload protection according to claim 2 struck that the spring element with extreme overload actuation imminent risk of breakage and damage from a be  agreed overload path is plastically deformable in such a way that one then the spring element of the power transmission block no longer deforms can engage in a force-transmitting manner in the drive of the feed means. For this case, if the telescopic support is used correctly and observed the overload signaling can not occur, it is appropriate that Arrange spring element easily replaceable.

In a particularly preferred, simple and inexpensive to produce leadership form according to claim 3, the spring element is a leaf spring, the starting from a free end of the handle on the power transmission supply block is preferably supported in a slot there and at one Handle actuation bulges towards the inside of the handle. Approximately In a central area of the leaf spring there is an overload signaling bolt arranged, when exceeding a predetermined travel threshold from a handle opening, preferably in a middle one Area of the palm rest area. Because a user of the telescopic support especially when the overload begins, the handle must be pressed vigorously, he clearly notices the emerging overload signaling bolt in his Palm. With an overload signaling bolt with a low Diameter and a rounded tip can also be deliberate Pain is generated, so that the user has another hand activity is held. The leaf spring used here can also be used simply dimension such that the extreme g. plastic Deformation occurs. The handle, the power transmission block and the Leaf spring can be particularly simple and in this embodiment integrate space-saving in a single handle.

In alternative embodiments according to claims 4 and 5 is overload signaling also by overload signaling bolts on the power transmission block or by sensor elements in connection possible with acoustic and / or visual alarms.  

Basically, the overload signaling described above and also the overload protection through plastic deformation of the Federele can be realized with all known feed means that driven in particular by pumping movements of a handle the. In general, according to claim 6, ratchets are used as feed means arrangements, rack arrangements with pawls or clamping arrangement known and usable. Is particularly suitable according to claim 7 a known per se and initially described feed means as Clamping arrangement with a manually operable locking plate and a front thrust plate on which a nose of the power transmission block engages where by means of pump movements of the handle linear actuator can be operated in stages. Such a feed can particularly simple, inexpensive and inexpensive in connection with the above overload protection.

The telescopic support is preferably used in addition to the overload-protected manually operated extension drive according to claim 8 with another Extension drive equipped as spring drive. There is a tension spring in the Telescopic tube included, preferably at the lower end via a block part with the lower end of the telescopic rod insertable in detachable system and is connectable and at the upper end with an upper area of the telephoto Skoprohrs is connected. The mainspring is thus when the tele is inserted telescopic rod extended and pre-prepared for an automatic extension tense. In the upper area of the telescope tube is a hand-operated, fe the loaded spring drive locking plate arranged in the unactuated to stood the spring drive locks. Such a tension spring has in particular the Advantage that the connection between the lower telescope rod end and the lower tension spring end under the telescopic rod Relegation of the system connection even further from the area of the relieved ten tension spring is extendable. So that the telescopic rod is not completely out can be driven, there is a pressure at its lower end.  

So that this with a maximum permissible not jammed and jammed, is at the lower end above the Pressing the telescopic rod integrated the anti-lock washer.

With the features of claim 9 it is achieved that the spring drive locking plate with the power transmission block and thus by hand reached for a short actuation in their release position for one automatic extension is convertible. After that, a circular backdrop, on which the wide angle leg plate tangentially lies and therefore no further adjustment of the spring drive locking plate causes this to be held in its release position, in which case the pump Movements of the handle for the gradual hand extension possible are. This is an advantageous one-hand solution for both extension drives Operation possible via the handle. Due to the angular design the spring drive locking plate is also an effective Ar according to claim 10 Fixation of the telescope arrangement possible with pre-tensioned tension spring, in which a determination of the spring drive locking plate in its locked position by means of a locking bolt, preferably as a tubular linchpin. This significantly increases operational safety and the accident rate Driving reduced, since the spring-loaded telescopic support is not unexpected and can expand unintentionally.

The telescopic rod can basically by hand into the telescopic tube Actuation of the locking plate is inserted again. To make this easier tern, with claim 11 is a hand-sliding retraction plate a structure similar to the locking plate proposed, the free end is designed as a hanging device. On the hanging device tools, cables, etc., which are particularly practical when working on an easel.  

According to claim 12, the telescopic rod is polygonal in cross section, preferably be designed as an equilateral hexagon. This will make sure prevents the telescopic rod from being inadvertently in the support position twisted. The telescopic rod is expediently made of solid material provides, however, depending on the circumstances and the given casual drawbar load can also be tubular.

Basically, the handle with overload protection as well as the front pushing means and locking means directly on an upper area of the telescope tubes are attached. From manufacturing technology and construction For reasons and for reasons of stability, however, it is according to claim 13 partial to attach these parts to a head part of the telescopic tube. A such a head part can be the end of the telescopic tube in a manner known per se reach over with a collar and / or with a plug-in part into the telescope protrude pipe so that there is a stable connection, the additional through measures known per se, such as gluing, screwing, Rivets, etc. can be reinforced and secured. Alternatively, a Head part also inserted in the upper pipe end and connected there who the, then the tube with a lateral longitudinal slot for the An Bring and the passage of the handle and possibly further actuation elements is to be provided.

The invention is explained in more detail with reference to a drawing of an exemplary embodiment.

Show it:

Fig. 1 is a schematic representation of a telescopic support in the collapsed condition,

Fig. 2 is a schematic representation of a telescopic support in auseinan dergezogenen state,

Fig. 3 a section through a head part in a non-operating position of the handle,

Fig. 4 shows a section through a head part with actuated handle,

5 shows overload protection. A section through a handle having a leaf spring as a,

Fig. 6 is a schematic illustration of a first alternative exporting approximate shape of a handle with a compression spring,

Fig. 7 is a schematic illustration of a second alternative exporting approximate shape of a handle with a leg spring,

Fig. 8 is a schematic illustration of a third alternative exporting approximate shape of a handle with a pressure sensor,

Fig. 9 is a schematic representation of a telescopic support with a Fe Positive drive for unstrained tension spring,

Fig. 10 is a schematic representation of a telescopic support with a Fe Positive drive a tensioned tension spring,

Shows a plan view of a recoil plate ness. 11 with a Einhängemöglich,

Fig. 12 is an illustration of an insertable into a locking opening of a telescopic tube pipe linch pin,

Fig. 13 is a schematic representation of an assembled pipe clip with safety chain. In Fig. 1, a telescopic support 1 is shown in the pushed together state and in Fig. 2 in the exploded state. The Tele scop support 1 comprises a telescopic in a telescopic tube 4 , hexagonal cross-section telescopic rod 5 and a head part 6 for stepwise extension of the telescopic rod 5 from the telescopic tube 4th

The telescopic tube 4 is constructed in two parts from a first upper telescopic tube part 2 and a second lower telescopic tube part 3 , the first upper telescopic tube part 2 telescoping into the second lower telescopic tube part 3 . A mutual height adjustment of these two telescopic tube parts 2 , 3 is possible by means of a tripod spring 7 with double bolts.

This tripod spring 7 with double bolts is arranged in a lower end of the first upper telescopic tube part 2 , wherein the double bolts protrude through opposite openings in the wall of the first upper telescopic tube part 2 . Likewise, along the second lower telescopic tube 3 , mutually opposite openings 8 are arranged in differing height positions. Through these openings 8, the double bolts of the tripod spring 7 also protrude, so that the first upper telescopic tube part 2 can be fixed in a desired height position relative to the second un lower telescopic tube part 3 .

For a secure stand of the telescopic support 1 is at the lower end of the second lower telescopic tube part 3, a rubber cap 9 was placed as an anti-slip with a large footprint. If the stability of the telescopic support 1 is reduced by wearing the rubber cap 9 , it can be easily replaced.

While a basic height adjustment can be carried out with the two-part telescopic tube 4 , for the final support of e.g. B. a to be fixed ceiling plate, the telescopic rod 5 is gradually extended. For this purpose, the structure and function of the head part 6 is explained in particular with reference to FIGS . 3 and 4:

The head part 6 is a separate, e.g. B. formed by plastic injection molded component and attached with a lower end 10 on the first upper Te leskoprohrteil 2 . The head part 6 has in the longitudinal direction through an opening 13 corresponding to the hexagonal cross section of the telescopic rod 5 , so that it can only be pushed up or down ver, but not rotated. Above the lower end 10 , the head part 6 has a cutout 14 in which the feed means of the telescopic rod 5 are arranged.

A force transmission block 15 is pivotally mounted on the head part 6 in an approximately central region of the cutout 14 . Tragungsblock at this force transmitter 15 is again a handle 16 movably supported and coupled with the force transmission block 15 by a leaf spring 17th This leaf spring 17 is supported from a free end 18 of the handle 16 in a slot 19 on the power transmission block 15 . An overload signaling pin 20 is arranged in the area below a handle opening 21 in a central area of the leaf spring 17 .

In an upper region of the cutout 14 , a manually operable locking plate 24 is pivotally held on the head part 6 . This locking plate 24 has an opening 25 through which the telescopic rod 5 is guided. The locking plate 24 rests with a rear end on a projection 23 and is spring-loaded around the opening 25 by a compression spring 26 . Thereby, the locking plate is pivoted to its in Figs. 3 and shown unactuated position from the horizontal to an inclined locking position 4 24, in which it blocks an insertion of the telescopic rod 5.

Furthermore, a feed plate 27 with an opening 28 on the head part 6 is pivotally held in the cutout 14 of the head part 6 . When the handle 16 is not actuated, this feed plate 27 is , as shown in FIG. 3, by a compression spring 30 which is supported on the one hand on the feed plate 27 and on the other hand on a projection 29 in a horizontal position on a projection 31 in the region below the feed plate 27 held. In this horizontal orientation of the feed plate 27 , the feed plate 27 for the telescopic rod 5 is freely passable. Before the jumps 29 and 31 are designed so that they each release the openings 25 and 28 for an unimpeded pushing through of the telescopic rod 5 .

For pushing out the telescopic rod 5 , the handle 16 is transferred from the non-actuation position shown in FIG. 3 to the actuation position shown in FIG. 4. A trained on the power transmission block 15 nose 32 comes into contact with the feed plate 27 and brings this in cooperation with the compression spring 30 from its horizontal position shown in FIG. 3 in the te shown in FIG. 4 te tilted position. Through this tilting of the feed plate 27, the telescopic rod 5 is peripherally clamped in the opening 28 and pushed out according to the same time the be through the nose 32 of the force transmission block 15 acted stroke of the pusher plate 27 of the projection 31 upwardly away from the telescopic tube. 4

If the handle 16 is now released by the operator, this moves due to the pressure force exerted by the compression spring 30 on the feed plate 27 and thus the nose 32 again into the non-actuated position shown in FIG. 3 Darge. The telescopic rod 5 can thus be gradually extended from the telescopic tube 4 by pumping movements in the sense of repeated pivoting of the handle 16 between the non-actuating position and the actuating position. The locking plate 24 does not hinder this extension movement of the telescopic rod 5 , since it is only effective in the direction of insertion.

The telescopic rod 5 is pushed out until the desired length of the telescopic support 1 is reached. If a certain load limit is exceeded during this extension movement of the telescopic rod 5 , the leaf spring 17 bulges, as shown in FIG. 5, in an arc towards the handle 16 , whereby the overload signaling bolt 20 is pushed through the handle opening 21 . This overload signaling bolt 20 then presses on the palm of the user and signals this an beginning overload of the telescopic support 1 , so that he ideally does not extend the telescopic rod 5 further.

Should a user ignore this overload signaling nevertheless, it is designed so that the leaf spring 17 is plastically deformed in such a way that the power transmission block 15 can no longer have a force-transmitting effect in the event of extreme overload actuation with imminent risk of breakage and damage to the telescopic tube support 1 from a certain overload path . An exchange of a then bent leaf spring 17 is possible at any time.

In Figs. 6 to 8 alternative embodiments of handles are illustrated with overload signaling devices. In Fig. 6, a handle 36 is shown, in which an overload signaling pin 38 is attached to a power transmission block 37 , the movement at a relative movement between the power transmission block 37 and the handle 36 from the inside through an associated handle opening 39 after exceeding a travel threshold of a Compression spring 40 emerges.

In Fig. 7, an ergonomically designed handle 42 is formed, which has a handle opening 43 , through which an arranged on a power transmission block 44 overload signaling bolt 45 emerges after exceeding a travel threshold of a leg spring 46 when starting overload.

In FIG. 8, a third alternative embodiment of a matched to the fingers of a hand ergonomic handle 48 is shown. A pressure sensor 49 acts here as overload protection and emits an optical and / or acoustic signal after a certain threshold value of an indicator has been exceeded.

In addition to the overload-protected, hand-operated extension drive, the telescopic support 1 has a further extension drive designed as a spring drive 51 . For this purpose, as can be seen from FIGS. 1 and 2 in connection with FIGS. 9 and 10, a tension spring 52 is contained in the first upper telescopic tube part 2 . This tension spring 52 is connected at the upper end to an upper region of the telescopic tube part 2 and closed at the lower end by means of a block part 53 . Alternatively, a rubber band could also be used here instead of the tension spring 52 .

As can be seen in particular from FIGS. 9 and 10, a lower end of the telescopic rod 54 during the insertion of the telescopic rod 5 comes into contact with the block part 53 when the locking plate 24 is pivoted upward according to the arrow 55 . As a result, the tension spring is pulled into the extended position shown in FIG. 10.

In order to prevent the telescopic rod 5 from being fully extended, a pressure 56 is formed at its lower end 54 . In order for this pressure 56 is not kantet ver at the maximum extension to the head portion 6, further the lower telescopic rod end 54 above the solution 56 Pres an antilock disc 57 is arranged. This prevents wedging due to a large contact surface.

To lock the spring drive 51 , a spring drive locking plate 60 is formed as an angle part in a lower region of the section 14 of the head part 6 . This spring drive locking plate 60 has a first angle leg plate 61 which includes an opening 62 through which the telescopic rod 5 is guided. Furthermore, the spring drive locking plate 60 has a perpendicular to the first angle leg plate 61 aligned second angle leg plate 63 , which in the illustration of FIG. 3 at a Ge approximate section of a link surface 64 of the force transmission block 15 abuts.

The spring drive lock plate 60 is spring-loaded by a compression spring 65 . This compression spring 65 is supported on the one hand at a lower end of the section 14 and on the other hand on an underside of the first angle plate 61 around the opening 62 around. In the angular range 66 of the spring drive locking plate 60 , a shaft 67 is also provided, which is mounted on the head part 6 .

In the embodiment shown in FIG. 3, non-operating position of the handle 16, the first angle leg plate 61 of the spring drive lock plate 60 by the interaction of cam surface 64, shaft 67 and Druckfe is pivoted from the horizontal 65th As a result, the telescopic rod 5 is jammed at the edge in the region of the opening 62 of the first angle leg plate 61 and thus prevents it from being pushed out of the telescopic tube 4 when the tension spring 52 is tensioned.

When the handle 16 is moved into the actuation position shown in FIG. 4, the force transmission block 15 is pivoted, the second angle leg plate 63 already after a short actuation path of the handle 16 due to the transition of the section approximating a straight line into a circular arc section of the link surface 64 is pivoted ver that it is aligned parallel to the extension direction of the telescopic rod 5 . Overall, this spring drive lock plate 60 is swung against the pressure direction of the pressure spring 65 around the shaft 67 ver that the first angle leg plate 61 thrust direction perpendicular to expand the telescopic rod 5 is aligned. Through the arc as a circle shaped portion of the cam surface 64 also is sicherge provides that the spring drive lock plate 60 handle operation even when another hand in this release position is maintained accurately, whereby the telescopic rod 5 is no longer clamped in the spring drive lock plate 60 and pushed out of the telescopic tube 4 is.

By releasing the handle 16 , the pressure force exerted by the Druckfe 30 on the feed plate and thus the nose 32 is transferred back into the non-actuation position shown in FIG. 3. Simultaneously with this transfer of the handle 16 in its non-actuation position, the spring drive locking plate 60 along the coulis senfläche 64 is again transferred into the clamping position of the telescopic rod 5 shown in FIG. 3.

As can be seen from FIGS. 1 and 2, a hand-sliding retraction plate 71 is arranged on an upper telescopic rod area 70 , by means of which the telescopic rod 5 can be pushed back into the Te leskoprohr 4 when the locking plate 24 is raised. As shown in FIG. 11 Darge, this retraction plate 71 has an opening 72 which is adapted to the hexagonal shape of the telescopic rod 5 . It is thereby achieved that the retraction plate 71 clamps the upper telescopic rod region 70 at a position of the retraction plate 71 oriented at an angle to the telescopic rod axis, as a result of which this can be inserted in a simple manner. On the retraction plate 71 , a recess 73 is also formed as a speed for attaching tools. This attachment option 73 can be particularly useful when working on an easel, for example by B. a drill can be hung.

In the illustrated in Fig. 1 collapsed condition of the tele skopstütze 1, wherein the tension spring 52 is stretched the spring drive 51, the entire system is maintained under a bias. In order to push the telescopic rod 5 unexpectedly through z. B. to avoid improper handling or during transport, a pipe clip 75 shown in FIG. 12 is provided as a backup as an additional extension. This linchpin 75 includes a locking pin 77 to which a foldable bracket 78 is hinged. As is evident from FIG. 13, the locking bolt 77 is pushed into a locking opening 76 of the head part 6 , whereby it fixes the second angle leg plate 63 of the spring drive locking plate 60 in the position shown in FIG. 3. The spring drive 51 is thus permanently blocked. So that the tube flap connector 75 can not be lost, this is attached to the head part 6 by means of a simple chain 79 .

Claims (13)

1. telescopic support,
Consisting of telescoping the telescopic rod in at least one telescopic tube and a manually operable feed means for gradually extending the telescopic rod from the telescopic tube, the feed means comprising a handle with a force-transmitting block pivotally mounted on the telescopic rod and the force-transmitting block transmitting force upon actuation of the handle into the Engages drive of the feed means, characterized in that
that the handle ( 16 ; 36 ; 42 ; 48 ) is movably mounted on the power transmission block ( 15 ; 37 ; 44 ),
that the handle ( 16 ; 36 ; 42 ; 48 ) is coupled to the power transmission block ( 15 ; 37 ; 44 ) by at least one spring element ( 17 ; 40 ; 46 ) such that the spring element ( 17 ; 40 ; 46 ) is deflected with a travel corresponding to the size of the actuating force, and
that at an incipient overload of the telescopic support ( 1 ) and / or components used according to an overload actuating force on the handle ( 16 ; 36 ; 42 ; 48 ) at least part of the spring element ( 17 ; 40 ; 46 ) an associated travel threshold to an overload spring travel is exceeded and thereby by the associated relative position between a spring element and the handle ( 16 ; 36 ; 42 ; 48 ) or the power transmission block ( 15 ; 37 ; 44 ) and / or by the associated relative position between the power transmission block's ( 15 ; 37 ; 44 ) and the handle ( 16 , 36 ; 42 ; 48 ) overload signaling means ( 20 ; 38 ; 45 ) can be activated as overload protection. 2. Telescopic support according to claim 1, characterized in that the spring element ( 17 ; 40 ; 46 ) is extremely plastically deformable in the event of extreme overload actuation, however, before an imminent breakage and damage occurs from a certain overload spring travel, such that when the spring element ( 17 ; 40 ; 46 ) the connected power transmission block ( 15 ; 37 ; 44 ) cannot engage the drive in a power-transmitting manner. 3. Telescopic support according to claim 1 or claim 2, characterized in
that the spring element ( 17 ) is a leaf spring, which is supported from a free end ( 18 ) of the handle ( 16 ) starting from the power transmission block ( 15 ) and bulges handle surface when the handle is actuated in the direction of the hand, and
that approximately in a central region of the leaf spring ( 17 ) a Überlastsi signaling bolt ( 20 ) is arranged, the derwegscheshold emerges from the handle opening ( 21 ) in the hand rest when the Fe is exceeded. 4. Telescopic support according to claim 1 or claim 2, characterized in that
that on the power transmission block ( 37 ; 44 ) an overload signaling bolt ( 38 ; 45 ) is attached, which is in a relative movement between the power transmission block ( 37 ; 44 ) and the handle ( 36 ; 42 ) from the inside through an associated handle opening ( 39 ; 43 ) emerges after the travel threshold is exceeded, and
that the spring element ( 46 , 40 , 17 ) is a leg spring ( 46 ), a compression spring ( 40 ) or a leaf spring ( 17 ). 5. Telescopic support according to claim 1 or claim 2, characterized in that on the power transmission block and / or on the handle ( 48 ) sensor elements ( 49 ), preferably a limit switch are arranged, which can be activated after the travel threshold is exceeded and to which we least an acoustic and / or optical alarm device is connected. 6. Telescopic support according to one of claims 1 to 5, characterized records that the feed means a ratchet arrangement, tooth rack gene arrangement or clamp arrangement. 7. Telescopic support according to claim 6, characterized in
that the feed means comprises a manually operable locking plate ( 24 ) and a feed plate ( 27 ) each with an opening ( 21 , 25 ) through which the telescopic rod ( 5 ) is guided,
that the locking plate ( 24 ) and the feed plate ( 27 ) on the telescopic tube ( 4 ) are pivotally held and spring-loaded in the insertion direction, such that the unactuated locking plate ( 24 ) is pivoted into the locking position and locks the telescopic rod ( 5 ) against insertion and the feed plate ( 27 ) for the telescopic rod ( 5 ) is free, and
that as a drive on the feed plate ( 27 ) a nose ( 32 ) of the power transmission block ( 15 ) in the extension direction of the telescopic rod ( 5 ) can be brought into contact and the extension drive can be actuated in stages with pumping movements of the handle ( 16 ). 8. Telescopic support according to one of claims 1 to 7, characterized in that
that the telescopic support ( 1 ) in addition to the overload-protected, manually operable extension drive includes a further extension drive as Fe derantrieb ( 51 ), with a tension spring ( 52 ) which is contained in the telescopic tube ( 4 ) and at the lower end preferably via a block part ( 53 ) with the lower end of the telescopic rod ( 54 ) in detachable system bindable and connected at the upper end to an upper area of the telescopic tube ( 4 ), so that the tension spring ( 52 ) is pulled out and biased when the telescopic rod ( 5 ) is inserted, and
that in the upper region of the telescopic tube ( 4 ) a manually operable, fe derladen spring drive locking plate ( 60 ) is arranged with a similar structure to the locking plate ( 24 ) and feed plate ( 27 ) and this Fe derantriebsperrplatte ( 60 ) locks the spring drive ( 51 ). 9. Telescopic support according to claim 8, characterized in that the Fe derantriebsperrplatte ( 60 ) is designed as an angular part through the first approximately transverse to the extending angle leg plate ( 61 ), the telescopic rod ( 5 ) is guided and the second angle leg plate ( 63 ) on one Link surface ( 64 ) of the power transmission block ( 15 ) rests in such a way that when the handle ( 16 ) is open, the first angle leg plate ( 61 ) lies in its tilted locking position by the associated spring ( 65 ) and after a short actuation path of the handle ( 16 ) into the release position is transferred, after which the Ku lissenfläche ( 64 ) forms a circular section around the pivot axis of the power transmission block ( 15 ), so that in a further actuation path of the handle ( 16 ) the first angle leg plate ( 61 ) remains in the release position. 10. Telescopic support according to claim 9, characterized in that he ste angled leg plate ( 61 ) and thus the spring drive locking plate ( 60 ) through a transversely through at least one locking opening ( 76 ) in the telescopic tube ( 4 ) insertable locking bolt ( 77 ), preferably as a pipe clip ( 75 ), cotter pin or spring pin can be fixed in its locked position. 11. Telescopic support according to one of claims 1 to 10, characterized in that on the telescopic rod ( 5 ) has a manually operable and manually displaceable retraction plate ( 71 ) with a structure similar to that of the locking plate ( 24 ), the free end of which is attached to the device ( 73 ) is trained. 12. Telescopic support according to one of claims 1 to 11, characterized in that the telescopic rod ( 5 ) is polygonal in cross section, before trains is designed as a hexagon. 13. Telescopic support according to one of claims 1 to 12, characterized in that the pivotable handle ( 16 ) with overload protection, the feed means and optionally the upper connection of the tension spring ( 52 ) and the spring-loaded spring drive locking plate ( 60 ) on a head part ( 6 ) of the telescopic tube ( 4 ) are arranged, which is placed on the tube ( 4 ) or inserted into it.