DE8312362U1 - TRAVELABLE RACK - Google Patents

Description

• · Il

I ·

• t

BOEHMERT & BOEHMERT

AN1VALTSSOCIETY Boehmerl & Boehmert, P.O. Box / P. O Box 107) 27, D-2800 Bremen 1

To the

German Patent Office

Zweibrückenstrasse 12th

8000 Munich 2

PATENT LAWYER DR-ING. KARL BOEHMERT (1933-1973) PATENT Attorney DIPL-ING. ALBERT BOEHMERr, BREMEN LAWYER WILHELM J. H. STAHLBERG, BREMEN PATENT ADVOCATE DR-ING.WALTERHOORMANN, BRErtvEN PATENT ADVERTISEMENT DIPL.-PHYS. DR. HEINZ GODDAR, BREMEtJ PATENT Attorney DIPL-ING. EDMUND R EITNER, MUNICH LAWYER WOLF-DIETER KUNTZE, BREMEN LAWYER DIPL-ING. JAN G. TÖNNIES, BREMEN PATENT ADVERTISER DIPL-CHEM.DR.CORNELIANEIDL.MÜNCHE

Your sign Your ref.

Hay registration

Your letter from Your letter & f

Our mark Our ref.

C 1835 / A Bremen, Hollerallee 32

April 26, 1983

Cordes GmbH & Co. KG, Weißenfeider Str. 1, 2165 Harsefeld

Movable transport frame

The invention relates to a movable transport ^{frame 1} for transporting and storing piece goods or the like, which can be driven via a drag chain running preferably under the floor in a guide channel, with a base part and a coupling device, preferably connected to the base part, for coupling the transport frame to the Drag chain, wherein the coupling device can be moved into an engagement position and a release position and is preferably to be actuated by hand via an actuating rod, and wherein the actuating rod is furthermore into one of the engagement position and one of the release position of the

1031

Bremen / Bremen Office:

P.O. Box 107127 Hollerallee 32, D-2800 Bremen 1 Telephone: (0421) * 349071 Facsimile / Telecopier: CCITT 2 Telegr. / Cables: diagram Bremen Taex: 244958 bopatd

Accounts Bremen: Bremer Bank, Bremen

(BLZ 29080010) 100144900

Deutsche Bank, Bremen .. (BLZ2907W50) ni2002 .. " *. .Bank, for ^ emei ^ virlSClJstt, Munich Ζ CPLZ700l01Hn79077CI2qp. ·

Office MOnchen / Munich Office (only pmtcnunwatt)

P.O. Box 220137 Schlolthauerstraße 3, D-8000 Munich 22 Telephone: (089) 223311 telecop. / telecop .: (089) 2215 69 CCITT 2 Telegr. / Cables: Forbopat Munich Telex: 524282 forbod

V (BLZ 20010020) 126083-202

BOEHMERT. &H

Coupling device is to move corresponding engagement or release position.

Transport racks of the type discussed above are known in various embodiments. you will be particularly preferred for transporting and storing piece goods such as boxes, boxes and the like used and have meanwhile proven themselves very well in practice. Specifically, it is in the case of the transport racks in question, those that are attached to a conveyor, e.g. an underfloor Drag chains can be coupled and in this way, without requiring further operator intervention, are to be moved over predetermined conveying paths.

In a known transport frame of the type mentioned, the coupling device is via a To operate the operating rod in such a way that the operating rod from the engaged position of the Coupling device corresponding engagement position is to move into one of the solution position of the coupling device, corresponding solution position. At a Such a design of the transport frame, it is felt to be disadvantageous that the actuating rod either in the release position or in the engaged position for one side to the operating rod standing operator is inevitably relatively far away. Especially when the operation such a transport frame is to be carried out from alternating sides, result in particular then difficulties when the operating rod in the engaged position in one of the loading

• Κ I'M »· ■ I ····« · ^Κ

• ••• ■ III * J

boehwert: &: ΒΰΕΗΑίέ ^ τ " ^:

is to move the servant away direction, since then on the one hand a relatively large amount of force is required and on the other hand, the operating rod with respect to the operator in a increasingly unfavorable position.

On the basis of the prior art presented above, the present invention is based on the object to design and develop the known caddy in such a way that the actuation of the Coupling device as possible independently of the operator side in a consistently simple manner for an operator is to be carried out.

According to the invention, the object indicated above is first of all and essentially solved in that the actuating rod is rotatably mounted, wherein a portion of the actuating rod forms a load lever arm that is used to actuate the coupling device a first end region of a rotatably mounted actuating lever with the load lever arm is connected via an intermediate member and a first link and the intermediate member continues to be connected to a is connected to a fixed rod rotatably attached to the second link, the operating rod in Relation to their trajectory from a solution position is to be moved into an engagement position in both possible directions of movement.

According to the invention it has been recognized that the engagement sposition of the coupling device not necessary only one engagement position of the actuating rod must be assigned. Rather, the actuation

I «rl ·

BQEHlMERT Ä? BOEHMERT. ^:

rod several, corresponding to the same engagement position Have engagement positions, so that the different engagement positions of the operating rod can be provided in such a way that even when the coupling device is operated by different Operating sides each have an engagement position available in which the actuating rod is technically favorable to move.

In the context of the present invention it can in principle be provided that with the insertion, the actuating rod is connected in an engagement or in the solution position that a solution or an engagement of the clutch device via an auxiliary force, e.g. hydraulically or electromechanically is triggered. As required by a transport frame designed according to the invention, however, as a rule that it is as maintenance-free as possible and that it works reliably even under rough operating conditions should, it is preferably provided that the actuating rod pivot in the actuating plane is and that the pivoting movement of the operating rod via a lever system on the fastening lever is transmitted.

Because the intermediate member is articulated to the fixed rod via a first link, the movement of the end region of the intermediate member connected to the fixed rod via the intermediate member is thus predetermined as a circular movement with the radius of the first link.

• I I I t »

BOEHMERT »BüEHMßfcT ,, '

In a further embodiment of the invention it is provided that the actuating rod in a substantially is to move perpendicular to the floor operating plane. With a transport frame of the type in question, the operating level is usually on a narrow side of the transport frame be provided, since the loading and unloading of the transport racks usually takes place on their broad sides, so that in this embodiment the actuation rod in eiuer to a narrow side of the transport frame parallel plane is to be operated.

Furthermore, the transport frame according to the invention preferably designed such that the; the engagement positions corresponding to the engagement position of the coupling device the actuating rod are arranged essentially in corner areas of the bottom part. So if, for example, as mentioned above, the coupling device on a narrow side of the transport frame and the one for actuating the coupling device serving actuating rod arranged accordingly in an actuating plane provided on the narrow side is, an operator can move the coupling device into the engaged position by the operating rod is moved towards a corner area of the transport frame. As each of the two the corner areas assigned to the narrow side are assigned an engagement position of the actuating rod is, an operator can always use the clutch device regardless of the actuation side move into their engaged position that they the Operating rod moves towards a corner area and thus towards its respective location, something in each

Pall a technically favorable sequence of movements guaranteed.

It is furthermore preferably provided that the position corresponding to the release position of the coupling device Solution position of the actuating rod essentially in relation to the movement path of the actuating rod centered between the two of the engagement position Coupling device is arranged corresponding engagement positions. This is the operating rod from the release position from each operating side by approximately the same distance into the engagement position to move.

The one provided in the transport frame according to the invention The coupling device can in principle be designed in different ways. According to the invention however, it is provided as an advantageous embodiment that the coupling device has at least one Has coupling bolts to be moved in the vertical direction.

The lever system, which is used to transform the pivoting movement of the operating rod, is still there preferably designed in such a way that a second end region of the actuating lever which is not connected to the intermediate member acts on the coupling bolt.

Advantageously, the actuating rod is also rotatably mounted on the fixed rod.

To support the work flow at a Actuation of the clutch device is done

still proven to be advantageous that the coupling bolt is to be actuated in each case from the engagement position into the release position against the force of a spring. In other words, the disengagement of the coupling pin into the engagement position is effected by spring force supported while the retraction of the coupling bolt from the engaged position into the release position takes place against the force of the spring. Appropriately, it is also provided in this embodiment that the Spring is arranged concentrically to the coupling bolt.

To solve the problem according to the invention, the known To train the transport frame in such a way that the actuation of the coupling device is as independent as possible can be carried out from the operator side in a consistently simple manner for an operator it is not absolutely necessary in the context of the present invention that the operating rod in relation on their trajectory from a solution position in both possible movements into an engagement position is to move. Rather, while maintaining the measure that the actuating rod is rotatably mounted, the object can also be achieved in that the operating rod as a result in relation to their trajectory from an engagement position in both possible directions of movement in a solution position is to be moved.

The solution to the problem according to the invention shown above can be implemented in detail, for example, that the coupling bolt is connected to the lever arm of the actuating rod only via an intermediate link.

is bound. The only vertical

* The given displaceability of the coupling bolt results

without further ado that the coupling bolt is in the middle Position of the actuating rod, that is to say in this case the engagement position, is most disengaged is, so in this case it is in the engaged position. When the operating rod is pivoted In one of the possible directions of movement, the coupling bolt in the case in question alternative design drawn in or transferred to the solution position.

In particular if, as stated above, the movement of the coupling bolt out of the solution position into the engaged position with the assistance of a spring force occurs, it is useful in a certain way to lock or the like. The actuating rod in the release position to prevent accidental or even automatic engagement of the clutch device to avoid in the engaged position. According to the invention, this is realized in that the The actuating rod has a detent or the like and one that is not connected to the actuating rod Gegenhaiterung is provided, and that the locking knobs in the release position of the actuating rod in the The counter bracket is to be locked in place.

As an alternative to the embodiment described above, the locking can also be implemented in such a way that that a locking bolt and a not connected to the actuating rod, having a locking recess Locking element is provided, and that the locking pin in the release position of the actuating rod in the

• · I

■ I t

■> t ·

Latch recess is to be locked. While at the previously described embodiment neither the locking knobs nor the counter bracket are movably provided, but the latching solely due to elastic deformations in the actuating rod or the counter bracket is to be achieved, the locking bolt is provided movably in the last-described embodiment, so that at least one disengagement of the locking pin only after a corresponding 3etoperation of the locking pin can be done. It is recommended that the locking bolt be slidable in or on the operating rod to store and the operation via a remote control connected to a handle part of the operating rod to realize. Such a remote actuation can, for example, from one on the handle part of the actuating rod pivotably mounted handle and an actuating means connecting the handle and the locking pin exist. It is also advisable to provide a spring in such a way that the latching of the Locking bolt in the locking recess with spring support takes place, so that when the actuating rod is moved from an engagement position in di>, Solution position the locking of the actuating rod in the solution position takes place automatically.

As already stated earlier, the coupling device is preferably on a narrow side of the transport frame, namely on the one in the direction of travel arranged on the front side of the transport frame. The arrangement of the coupling device on the in the direction of travel the front side of the transport frame allows a satisfactory, Requires no further operator intervention

BOEWJVERT & ÄOEHMERT 'ί

If · ·

- 10 -

change of the transport frame over a specified route by means of the drag chain. However, it has been shown that the handling of the transport frame is not yet satisfactory, especially in the case of narrow bends is. The rear area of the transport frame runs out of an in with reference to the trajectory of the drag chain mean trajectory out what different aspects can be disadvantageous. First, the consideration of such driving behavior requires that in the area In tight curves, a relatively wide space can be kept free for the transport racks to pass through must, however, the case can still occur that individual castors of the caddy in a such "pulling out" does not adjust itself in the required way with and the transport frame partially has to be moved with locked wheels.

In order to counteract the unsatisfactory driving behavior of a transport frame described above, is provided according to a further teaching of the present invention that two coupling devices are present and that the second (rear) coupling device on the rear in the direction of travel Side of the transport frame is arranged.

To ensure simple operation, it is advisable to provide that both coupling devices can be operated synchronously. This is advantageously done in that the coupling devices are mechanically coupled via a connecting shaft or the like. So if one of the coupling devices

ItI) II ··· · Ι '"' It.

- 11 -

is actuated via the connecting shaft at the same time the other clutch device is actuated.

It is expediently provided that the side of the transport frame which is arranged at the front in the direction of travel the front coupling device is to be actuated via the operating rod and the rear coupling device mechanically, for example via a connecting shaft, with the front coupling device connected is.

A particularly advantageous embodiment results from the fact that the coupling bolt of the rear coupling device in the engaged position of this clutch device disengaged only by such an amount is that it engages in the guide channel, but not in the drag chain.

Finally, with regard to the design of a coupling device, it has proven to be expedient to that the actuating rod is operatively releasably connected to the coupling device. If so For example, if several transport racks of the type in question are available, the actuating rod withdrawn after actuation of the coupling device at a transport device and is thus free again for use in another transport frame. For one are on this Way only a relatively limited number of operating rods for a given number of transport racks necessary, on the other hand, an unauthorized actuation of the coupling device during a transfer

BOEHMERT & BOlHMERT

port frame prevented by such a measure because an actuation of the coupling device without the associated actuating rod, if at all can only be carried out with great effort.

Further details of the present invention emerge from the subclaims and the following Description of an embodiment.

The embodiment is shown in the accompanying drawing. It shows:

Fig. 1 is a front view of an only partially illustrated invention Transport frame;

FIG. Z shows a partial illustration of a transport frame according to FIG. 1 _f , the coupling device being in the engaged position;

FIG. 3 shows a detail of the object according to FIG. 1, sectioned along the line III-III and

4 shows a further front view of a transport frame according to the invention, wherein the coupling device is in a further (second) engagement position and one compared to the representations in FIGS. 1 and 2 modified locking

- 13 solution option is realized.

A movable transport frame, denoted overall by 22, for transporting is shown and described and storage of piece goods or the like, which via a preferably underfloor in a guide channel 33 running drag chain 34 is drivable, with a bottom part 5 and one connected to the bottom part 5 Coupling device 2 for coupling the transport frame 22 to the drag chain 34, the coupling device 2 is to be moved into an engagement position 1 and a release position 7 and by hand is to be operated via an operating rod 4.

The transport frame 22 according to the invention is therefore used for The method is coupled with the drag chain 34 via the coupling device 2 and then follows that through the Guide channel 33 of the drag chain 34 predetermined path.

In the illustrated transport frame according to the invention 22, the coupling device 2 is in its release position in the illustration according to FIG. 1 7. In order to now move the coupling device 2 into its engagement position 1 shown in broken lines in FIG. 1, the actuating rod 4, as shown in FIGS. 2 and 4, are moved into two different engagement positions 3.

From the drawing it can also be seen that the actuating rod 4 is essentially at right angles is to move to the bottom part 5 extending operating level. As shown in FIG. 2 and in Fig. 4 shown engagement positions 3 of the Bet & ti-

it ι · · ·

transmission rod 4 can be seen, these are essentially Associated with corner areas 6 of the bottom part 5.

In the release position 7 of the coupling device 2 shown in FIG. 1, the associated release position is 8 of the actuating rod 4 essentially centrally with respect to the path of movement of the actuating rod 4 between the two engagement positions assigned to the engagement positions 1 of the coupling device 2 3 provided. The operating rod 4 is thus in the release position by an operator 8 from both possible operating sides that is approximately from the corner areas 6 of the base part 5 approximately equidistant. The movement of the operating rod 4 from the release position 8 into one of the engagement positions 3 can then each be made by the operator in such a way that they the operating rod 4 moves towards you.

As can also be seen in FIG. 1, the coupling device 2 assigns one in the vertical direction moving coupling pin 9.

The transfer of the pivoting movement of the actuating rod 4 _t to the coupling bolt 9 is carried out according to the invention in such a way that when the actuating rod 4 is pivoted in the operating plane running essentially perpendicular to the base part, this pivoting movement is transmitted to the coupling bolt 9 via the lever system 10 shown.

In detail, the actuating rod 4 is in the load

It
·

gerstelle 23 rotatably mounted and is a load lever arm 11 of the operating rod 4 via a Intermediate member 12 connected to a rotatably mounted actuating lever 14, one not having the intermediate member 12 connected to the second end region 15 of the actuating lever 14 on the coupling bolt 9 acts.

Furthermore, the intermediate member 12 is via a second Link 16 is articulated to a fixed rod 17. This means that the one with the second link 16 connected end region of the intermediate member 12 only on a circular path around the articulation point of the first link 16 is to be moved on the fixed rod 17 with the radius of the second link 16.

In detail, the actuating lever 14 also has a bearing point 24, one side of the actuating lever is connected via the intermediate member 12 to the actuating rod 4, while the in With reference to the bearing point 24 opposite end of the actuating lever 14 on the coupling pin 9 acts.

The articulated connection of the intermediate link 12 with the actuating rod 4 is * ·, furthermore not directly, but via an articulated connection to the actuating rod 4 and to the actuating lever 14 first link 18 executed. The first link 18 allows the operating rod 4 in the Solution position 7 of the coupling device 2 approximately perpendicularly with respect to a through the bottom part Plane runs, and that the operating rod 4 from

BOEHMERT &

this vertical position can be moved to either side in an inclined position without that with respect to the intermediate member 12 and the operating lever 14 can occur a self-locking.

Furthermore, it can be seen in Fig. 1 that the actuating rod 4, like the second link 16, is also on the fixed rod 17 is rotatably mounted, namely at the bearing point 23.

In order to achieve the simplest possible operation of the coupling device 2, it is provided that the Coupling pin 9 in each case from the engagement position 1 into the release position 7 against the force of a spring 19 (see, for example, FIG. 2) is to be actuated. The spring 19 is concentric with the coupling pin 9 provided, i.e. in the present embodiment an upper region of the coupling bolt 9, the has a significantly smaller cross section compared to the coupling bolt 9, within the spring 19 guided.

As can be seen in particular in FIG. 3, a locking knob 20 is also provided on the actuating rod 4, in the solution position 8 of the actuating rod 4 in a corresponding, not with the actuating rod 4 connected counter bracket 21 engages. This can prevent the coupling device from disengaging unintentionally 2 from the solution position 7 into the engagement position 1 can be reliably prevented.

As an alternative to the embodiment described above, FIG. 4 shows that the lock also

can be realized in that a locking bolt 26 and a not connected to the actuating rod 4, a locking recess 27 having locking element 32 is provided, and that the locking bolt 4 in the locking recess 27 is to be locked. The locking bolt 26 can be displaced on the actuating rod 4 stored.

Furthermore, the locking bolt 26 is via a remote control connected to a handle part 28 of the actuating rod 4 29 to operate. The remote control 29 essentially consists of one on the handle part 28 pivotably mounted handle 30 and an actuating means 31, the handle 30 and the locking bolt 26 connects.

According to a further teaching of the present invention, which is not implemented in the illustrated exemplary embodiment, two coupling devices 2 can also be provided, which are used for common, Synchronous actuation via a connecting shaft or the like. Are coupled. The second is preferred rear coupling device provided in such a way that the coupling bolt 9 in the engagement position 1 of this The coupling device is only disengaged to such an extent that it is in the guide channel 33, however does not intervene in the drag chain 34.

Finally, with your transport frame according to the invention 22 is still provided that the actuating rod 4 with the coupling device 2 is operationally releasable connected is. In the illustrated embodiment, this is achieved in that the beta

BOEHME3RT * &'ßöfeHM ^ Rt .. ^: '

- 18 -

processing rod 4 via a similarly designed according to a tongue-and-groove connection in the support area 25 (Fig. 2) is to be introduced.

The features of the invention disclosed in the above description, the drawing and in the claims can be used both individually and in any combination for the implementation of the invention in be essential to their various forms.

BOEHMERT ¹ S BCfEHMERT · .. '

- 24 -

C 1835

List of reference symbols

1 Engagement position 1 2 Coupling device 2 3 Engagement position 3 4th Operating rod 4th 5 Bottom part 5 6th Corner area 6th 7th Solution 7th 8th Solution position 8th 9 Coupling bolt 9 10 Lever system 10 11th Load lever arm 11th 12th Intermediate link 12th 13th (first) end area (of 14) 13th 14th Operating lever 14th 15th (second) end area (of 14) 15th 16 (second) handlebar 16 17th Plague stick 17th 18th (first) handlebar 18th 19th feather 19th 20th Locking knob 20th 21 Counter bracket 21 22nd Transport rack 22nd 23 Depository 23

BOEHMERT KBOEMMBRf. ]!

- 25 -

24 Storage point (of 14) 24 25th Bracket area 25th 26th Locking bolt 26th 27 Locking recess 27 28 Handle part (of 4) 28 29 Remote control 29 30th Handle 30th 31 Fasteners 31 32 Locking element 32 33 Guide channel 33 34 Drag chain 34

Claims (21)

- 19 - C 1835 claims 1. Mobile transport frame for transporting and storing piece goods or the like Drag chain running underfloor in a guide channel can be driven, with a bottom part and a coupling device, preferably connected to the base part, for coupling the transport frame with the drag chain, moving the coupling device into an engagement and a release position and is preferably to be actuated by hand via an actuating rod, and wherein furthermore the actuating rod into an engagement position corresponding to the engagement position and the release position of the coupling device or solution position is to be moved, characterized in that the actuating rod (4) is rotatable is mounted, a portion of the actuating rod (4) forming a load lever arm (11), that for actuating the coupling device (2) a first end region (13) of a rotatably mounted Operating lever (14) with the load lever arm (11) via an intermediate link (12) and a first link (18) is connected and the intermediate member (12) continues with - 20 - a second link (16) rotatably attached to a plague rod (17) is connected, the actuating rod (4) to move in relation to their trajectory from a release position (8) in both possible directions of movement into an engagement position (3) is. 2. Transport frame according to claim 1, characterized in that the actuating rod (4) in egg. is to move substantially at right angles to the bottom part (5) extending operating plane. 3. Transport frame according to claim 1 or 2, characterized in that the engagement position (1) of the Coupling device (2) corresponding engagement positions (3) of the actuating rod (4) essentially are arranged in corner areas (6) of the bottom part (5). 4. Transport frame according to one of claims 1 to 3, characterized in that the solution position (7) the coupling device (2) corresponding release position (8) essentially in the middle with respect to the movement path of the actuating rod (4) between the two of the engagement position (1) of the support device (2) associated engagement positions (3) is arranged. 5. Transport frame according to one of claims 1 to 4, characterized in that the coupling device (2) has at least one coupling bolt (9j to be moved in a vertical seal). BOEHMBRT & 'Β0ΕΗΜΕΊ * Τ' - 21 - 6. Transport frame according to claim 5, characterized in that a not connected to the intermediate member (12) connected second end region (15) of the actuating lever (14) acts on the coupling bolt (9). 7. Transport frame according to one of claims 1 to 6, characterized in that the actuating rod (4) is also rotatably mounted on the fixed rod (17). 8. Transport frame according to one of claims 5 to 7, characterized in that the coupling pin (9) in each case from the engagement position (1) into the release position (7) is to be actuated against the force of a spring (19). 9. Transport frame according to claim 8, characterized in that that the spring (19) is provided concentrically to the coupling bolt (9). 10. Transport frame according to one of claims 1 to 9, characterized in that the actuating rod (4) has a detent knob (20) or the like. And one counter bracket (21) that is not connected to the actuating rod (4) is provided, and that the latching knobs (20) is to be locked in the release position (8) of the actuating rod (4) in the counter holder (21). 11. Transport frame according to one of claims 1 to 10, characterized in that one locking bolt (26) and one not connected to the actuating rod (4) Locking recess (27) is provided, and that the locking bolt (26) in the release position (8) of the actuating «II It (IVl ptl Il I ■ III It * - 22 - engaging rod (4) in the locking recess (27) is. 12. Transport frame according to claim 11, characterized in that the locking bolt (26) is displaceable in or is mounted on the actuating rod (4). 13. Transport frame according to claim 11 or 12, characterized in that the locking bolt (26) has a with a handle part (28) of the operating rod (4) connected remote control (29) is to be operated. 14. Transport frame according to claim 13, characterized in that the remote control (29) one on the Handle part (28) pivotally attached handle (30) and a handle (30) and the locking bolt (26) connecting Having actuating means (31). 15. Transport frame according to one of claims 1 to 14, characterized in that the coupling device (2) on the front side in the direction of travel of the Transport frame (22) is arranged. 16. Transport frame according to one of claims 1 to 15, characterized in that two coupling devices (2) are provided and that the second (rear) Coupling device arranged on the rear side of the transport frame (22) in the direction of travel is. 17. Transport frame according to claim 16, characterized in that both coupling devices (2) synchronously are to be operated. - 23 - 18. Transport frame according to claim 17, characterized in that the coupling device (2) for synchronous Actuation mechanically or via a connecting shaft. The like. Are coupled. 19. Transport frame according to claim 17 or 18, characterized characterized in that the one arranged on the front side of the transport frame (22) in the direction of travel the front coupling device (2) can be actuated via the actuating rod (4) and the rear coupling device is mechanically connected to the front coupling device (2). 20. Transport frame according to one of claims 16 to 19, characterized in that the coupling bolt (9) of the rear coupling device is in engagement position (1) of this coupling device is disengaged only to such an extent that it is in the Guide channel (33), but does not engage in the drag chain (34). 21. Transport frame according to one of claims 1 to 20, characterized in that the operating rod (4) is operatively releasably connected to the coupling device (2).