Dock crane |
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| 申请号 | US3735879D | 申请日 | 1972-02-04 | 公开(公告)号 | US3735879A | 公开(公告)日 | 1973-05-29 |
| 申请人 | FIVES LILLE CAIL; | 发明人 | GRANDIN D FONTENAY AUX ROSES; | ||||
| 摘要 | The boom of a dock crane is pivoted to a trolley which is displaceably mounted on a mobile frame on the wharf. A support member, such as another trolley or a strut, supports the tackle for the boom intermediate the tackle and the frame. A cable connects the support member to the boom supporting trolley and guide pulleys for the cable are so mounted that the support member is displaced simultaneously in the same direction and at the same speed as the boom supporting trolley and to transmit to the frame the tilting force due to the weight of the boom and any load thereon. | ||||||
| 权利要求 | 1. An apparatus for loading and unloading bulk material into and from the hold of a ship, comprising the combination of 1. a mobile frame mounted on a wharf for movement in a first direction, 2. a pivotal boom extending in a second direction perpendicular to the direction of movement of the mobile frame, 3. a trolley mounted displaceably on the frame for movement thereon in the second direction, (a) one end of the pivotal boom being pivotally mounted on the trolley for pivoting about a horizontal axis, 4. means for receiving and transporting the bulk material carried by the other end of the pivotal boom, 5. means for raising and lowering the pivotal boom by pivoting the boom about the horizontal axis, 6. a support member for the pivotal boom raising and lowering means intermediate said means and the mobile frame for supporting the means on the frame, 7. a flexible elongated coupling element connecting the support member to the trolley, and 8. guide means for the flexible coupling element so mounted on the mobile frame between the support member and the trolley that the support member is displaced simultaneously in the same direction and at the same speed as the trolley, and to transmit to the frame the tilting force due to the weight of the boom and any load thereon. 2. a pivotal boom extending in a second direction perpendicular to the direction of movement of the mobile frame, 2. The apparatus of claim 1, wherein the means for raising and lowering the pivotal boom comprises a windlass and a tackle between the windlass and the other end of the boom, the windlass being mounted above the trolley. 3. The apparatus of claim 2, wherein the support member is a second trolley mounted displaceably on the frame for movement thereon in the second direction. 3. a trolley mounted displaceably on the frame for movement thereon in the second direction, (a) one end of the pivotal boom being pivotally mounted on the trolley for pivoting about a horizontal axis, 4. means for receiving and transporting the bulk material carried by the other end of the pivotal boom, 4. The apparatus of claim 3, wherein the windlass is mounted on the second trolley. 5. means for raising and lowering the pivotal boom by pivoting the boom about the horizontal axis, 5. The apparatus of claim 1, further comprising drive means for displacing the trolley. 6. a support member for the pivotal boom raising and lowering means intermediate said means and the mobile frame for supporting the means on the frame, 6. The apparatus of claim 1, wherein the support member is a strut having one end supported on the trolley and the other end connected to the trolley by the flexible elongated coupling element. 7. The apparatus of claim 6, wherein the one end of the strut is pivoted on the trolley. 7. a flexible elongated coupling element connecting the support member to the trolley, and 8. guide means for the flexible coupling element so mounted on the mobile frame between the support member and the trolley that the support member is displaced simultaneously in the same direction and at the same speed as the trolley, and to transmit to the frame the tilting force due to the weight of the boom and any load thereon. 8. The apparatus of claim 6, wherein the means for raising and lowering the pivotal boom comprises a windlass mounted on the trolley and a tackle between the windlass and the other end of the boom, the tackle being connected to the other end of the strut. 9. The apparatus of claim 1, further comprising two gears mounted on the trolley on either side thereof, two racks fixedly mounted on the frame, the gears meshing with the racks and the racks extending in the second direction, and a torsion shaft extending perpendicularly to the second direction and interconnecting the two gears. 10. The apparatus of claim 1, further comprising a counterweight for balancing a part of the weight of the pivotal boom, a cable whereon the counterweight is suspended and having one end affixed to the pivotal boom, and a guide pulley for the cable mounted on the support member. 11. The apparatus of claim 10, wherein the other end of the cable supporting the counterweight is affixed to the trolley, and the path of the cable is parallel to that of the flexible elongated coupling element connecting the support member to the trolley. 12. The apparatus of claim 1, wherein the means for raising and lowering the pivotal boom comprises a windlass and a tackle between the windlass and the other end of the boom, and further comprising a safety device including a counterweight attached to the tackle, a blocking means for holding the counterweight in a fixed position relative to the windlass under normal operating conditions, a control for inactivating the blocking means in response to a measured load on the boom when the operating conditions are not normal, and a drive means responsive to the control to displace the counterweight downwardly when the measured load is lower than a predetermined, normal value and thus to raise the boom correspondingly. 13. The apparatus of claim 12, wherein the drive means comprises a gear carried by the counterweight and a rack mounted at a fixed distance from the windlass, the gear meshing with the rack, and the blocking means normally preventing rotation of the gear. 14. The apparatus of claim 12, wherein the control comprises a dynamometric device mounted on the flexible elongated coupling element. |
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