Overhead travelling carriage
A platform 12 is supported by four belts 22 to 25 . Of the belts 22 to 25 , a pair of belts 24, 25 is attached to a pivoting arm 26 so that the pivoting arm 26 is pivotable around a pivoting shaft 28 . Pivoting of the pivoting arm 26 absorbs, for example, the difference in length between the belts 24, 25 . The present invention makes it possible to simplify an elevate and lower driving mechanism of the platform 12 and to easily adjust the lengths of the belts 22 to 25 . The present invention also makes it possible to prevent vibration during elevation or lowering and to allow the belts 22 to 25 to stand long use.
1. An overhead travelling carriage comprising:
four hanging members which hang, elevate, and lower a platform,
wherein two of the four hanging members are attached to respective sides of a pivoting shaft of a common pivoting arm, the pivoting arm being attached to the platform so as to be pivotable in a vertical plane around the pivoting shaft,
wherein the two other hanging members are attached to the platform by connection members having floating slots, and without using said common pivoting arm or a second common pivoting arm, said two other hanging members being fixed in a lateral direction, and
wherein an elevate and lower driving section of the overhead travelling carriage comprises drums having a common shaft, and the four hanging members are wound around and fed from the drums.
2. The overhead travelling carriage according to claim 1 , wherein the four hanging members each comprise a belt and are attached so that a width direction of the belts is parallel to a longitudinal direction of the pivoting arm.
3. The overhead travelling carriage according to claim 1 , wherein the two hanging members which are attached to the pivoting arm are disposed nearer to the axis of the pivoting shaft than said other two hanging members.
4. The overhead travelling carriage according to claim 1 , wherein a single driving motor which drives the drums having the common shaft is positioned between the drums.
5. An overhead travelling carriage comprising:
four hanging members which hang, elevate, and lower a platform,
wherein two of the four hanging members are attached to respective sides of a pivoting shaft of a pivoting arm, the pivoting arm being attached to the platform so as to be pivotable in a vertical plane around the pivoting shaft,
wherein the two other hanging members are attached to first and second fixtures, which are respectively attached to first and second connection members fixed to said platform,
wherein an elevate and lower driving section of the overhead travelling carriage comprises drums having a common shaft, and the four hanging members are wound around and fed from the drums, and
wherein said first and second fixtures are respectively connected to said first and second connection members by floating slots.
6. The overhead travelling carriage according to claim 5 , wherein the four hanging members each comprise a belt and are attached so that a width direction of the belts is parallel to a longitudinal direction of the pivoting arm.
7. The overhead travelling carriage according to claim 5 , wherein the two hanging members which are attached to the pivoting arm are disposed nearer to the axis of the pivoting shaft than said other two hanging members.
8. The overhead travelling carriage according to claim 5 , wherein a single driving motor which drives the drums having the common shaft is positioned between the drums.