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A device for connecting two clamps, each of which has a rail, including a housing that has two insertion openings, which point away from each other and each of which has an adjoining insertion channel, for inserting a respective rail. The device also includes at least one adapter piece which can be

A device for connecting two clamps, each of which has a rail, including a housing that has two insertion openings, which point away from each other and each of which has an adjoining insertion channel, for inserting a respective rail. The device also includes at least one adapter piece which can be inserted into one of the insertion openings and which reduces the free opening cross section of the insertion channel in order to insert a rail with a different cross-sectional area. The adapter piece has a lining which adjoins a collar. The lining rests against the wall of the insertion channel at least in some regions and forms an insertion channel with a reduced cross section in the inserted state, and the collar rests on an end face of the housing.

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1. A device for connecting two clamps each having a rail, the device comprising: a housing that has two insertion openings directed away from one another, each inserting opening having an adjoining insertion channel for insertion in each case of a rail; locking means for fastening the rails to the d

1. A device for connecting two clamps each having a rail, the device comprising: a housing that has two insertion openings directed away from one another, each inserting opening having an adjoining insertion channel for insertion in each case of a rail; locking means for fastening the rails to the device, the locking means being bringable from a locking position into a release position; at least one adapter piece insertable into one of the insertion openings to reduce a free opening cross-section of the insertion channel for insertion of a rail with another cross-sectional surface; and a latching device by which the adapter piece is held in the insertion channel, wherein the latching device is a latching lug, wherein the latching lug projects from a latching spring associated with a broad side wall of the adapter piece. 2. The device according to claim 1, wherein the adapter piece has a lining which adjoins a flange, wherein the lining rests at least in some regions against a wall of the insertion channel and in an inserted state forms an insertion channel of reduced cross-section, wherein the flange rests on an end face of the housing. 3. The device according to claim 2, wherein the lining has a U-shaped configuration in cross section, with narrow walls that extend from a broad side wall. 4. The device according to claim 3, wherein the broad side wall has a bulge. 5. The device according to claim 1, wherein each of the insertion channels in the housing has two opposing concavities for entry of a stop disposed on the rail. 6. The device according to claim 1, wherein the adapter piece forms at least one concavity for entry of a stop disposed on the rail. 7. The device according to claim 1, wherein each insertion opening in the housing and/or an insertion opening of the adapter piece forms a substantially cross-shaped window which is adjoined by the adjoining insertion channel. 8. The device according to claim 1, wherein the device is mirror symmetric. 9. The device according to claim 1, wherein the locking means have locking elements for entry respectively into a locking opening in a rail inserted in the housing. 10. The device according to claim 9, wherein the locking elements are locking bolts. 11. The device according to claim 1, further comprising a push button displacable against a restoring spring in a recess in the housing, the push button being connected by a rod to a support having a locking bolt that in a locking position intersects the insertion channel and is movable out of the insertion channel by pressure on the push button. 12. A device for connecting two clamps each having a rail, the device comprising: a housing that has two insertion openings directed away from one another, each inserting opening having an adjoining insertion channel for insertion in each case of a rail; locking means for fastening the rails to the device, the locking means being bringable from a locking position into a release position; at least one adapter piece insertable into one of the insertion openings to reduce a free opening cross-section of the insertion channel for insertion of a rail with another cross-sectional surface; and a push button displacable against a restoring spring in a recess in the housing, the push button being connected by a rod to a support having a locking bolt that in a locking position intersects the insertion channel and is movable out of the insertion channel by pressure on the push button. 13. The device according to claim 12, wherein the adapter piece has a lining which adjoins a flange, wherein the lining rests at least in some regions against a wall of the insertion channel and in an inserted state forms an insertion channel of reduced cross-section, wherein the flange rests on an end face of the housing. 14. The device according to claim 13, wherein the lining has a U-shaped configuration in cross-section, with narrow walls that extend from a broad side wall. 15. The device according to claim 14, wherein the broad side wall has a bulge. 16. The device according to claim 12, wherein each of the insertion channels in the housing has two opposing concavities for entry of a stop disposed on the rail. 17. The device according to claim 12, wherein the adapter piece forms at least one concavity for entry of a stop disposed on the rail. 18. The device according to claim 12, wherein each insertion opening in the housing and/or an insertion opening the adapter piece forms a substantially cross-shaped window which is adjoined by the adjoining insertion channel. 19. The device according to claim 12, wherein the device is mirror symmetric. 20. The device according to claim 12, wherein the locking means have locking elements for entry respectively into a locking opening in a rail inserted in the housing. 21. The device according to claim 20, wherein the locking elements are locking bolts.