A hoist includes a platform, a drum, and a motor. The drum is supported by and configured to rotate with respect to the platform, and the motor is coupled to the drum and configured to rotate the drum. The hoist further includes a shaft having a splined section and an interlock system configured to
A hoist includes a platform, a drum, and a motor. The drum is supported by and configured to rotate with respect to the platform, and the motor is coupled to the drum and configured to rotate the drum. The hoist further includes a shaft having a splined section and an interlock system configured to constrain rotation of the shaft. The shaft is coupled to at least one of the drum and the motor, and communicates torque between the drum and the motor. The interlock system includes a keyed ring and an arm. The keyed ring is configured to slide onto and engage the splined section of the shaft. The arm extends from the keyed ring and is configured to provide leverage to limit rotation of the keyed ring, thereby interlocking rotation of the shaft when the keyed ring is engaged with the splined section of the shaft.
대표청구항▼
1. A hoist, comprising: a platform;a drum supported by and configured to rotate with respect to the platform;a motor coupled to the drum and configured to rotate the drum;a shaft having a splined section and coupled to at least one of the drum and the motor, wherein the shaft communicates torque bet
1. A hoist, comprising: a platform;a drum supported by and configured to rotate with respect to the platform;a motor coupled to the drum and configured to rotate the drum;a shaft having a splined section and coupled to at least one of the drum and the motor, wherein the shaft communicates torque between the drum and the motor; andan interlock system, comprising: a keyed ring configured to slide onto and engage the splined section of the shaft;an arm extending from the keyed ring, wherein the arm is configured to provide leverage to limit rotation of the keyed ring and thereby interlocking rotation of the shaft when the keyed ring is engaged with the splined section of the shaft;a guide for the arm; anda fastener configured to extend through a hole in the arm to hold the arm in a fixed position with respect to the guide;wherein the arm comprises two holes configured to receive the fastener, wherein a first of the two holes is configured to receive the fastener when the keyed ring is engaged with the splined section of the shaft and the second hole is configured to receive the fastener when the keyed ring is not engaged with the splined section of the shaft. 2. The hoist of claim 1, wherein the guide is fixed with respect to the platform and the arm is configured to slide axially along the guide so that the keyed ring may engage the splined section of the shaft. 3. The hoist of claim 2, wherein the guide comprises a stopper on an end thereof that limits the axial translation of the arm. 4. The hoist of claim 3, wherein the guide is configured to allow a limited amount of rotation of the arm and keyed ring so that the keyed ring may be aligned with teeth of the splined section of the shaft, and wherein the limited amount of rotation is less than ten degrees. 5. The hoist of claim 1, wherein the fastener is a pin, and the hoist further comprises a sensor proximate to the first hole, wherein the sensor is configured to detect and provide a signal corresponding to the pin extending through the first hole, thereby indicating a status of the interlock system. 6. The hoist of claim 5, further comprising a computerized controller in communication with the sensor, wherein the computerized controller comprises a logic module for at least partially operating the hoist as a function of the signal. 7. The hoist of claim 6, wherein, in response to absence of the signal, the computerized controller is configured to at least one of: prevent the hoist from operating; andinitiate a shutdown sequence of the hoist. 8. The hoist of claim 1, wherein the fastener comprises a nut and a bolt, wherein the bolt has an aperture in a shank of the bolt, and wherein the bolt is configured to be fastened to the arm through the second hole with the nut interposed between the arm and a padlock extending through the aperture in the shank to lock the arm with the keyed ring engaged with the splined section of the shaft. 9. The hoist of claim 1, wherein the interlock system further comprises a wedge configured to be coupled to opposite sides of the aim with the fastener, wherein the wedge positions the aim such that the keyed ring engages the splined section of the shaft when the wedge is coupled to one side of the arm, and wherein the wedge positions the arm such that the keyed ring disengages the splined section of the shaft when the wedge is coupled to the other side of the arm. 10. The hoist of claim 9, wherein the wedge has a notch configured to receive the guide. 11. The hoist of claim 1, further comprising a second arm extending from the keyed ring opposite to the arm, wherein the arm, the second arm, and the keyed ring together form an integral locking bar. 12. The hoist of claim 11, further comprising a brake for the motor, wherein the locking bar engages the shaft between the motor and the brake. 13. A hoist, comprising: a platform;a drum supported by and configured to rotate with respect to the platform;a motor coupled to the drum and configured to rotate the drum;a shaft having a splined section and coupled to at least one of the drum and the motor, wherein the shaft communicates torque between the drum and the motor; andan interlock system, comprising: a keyed ring configured to slide onto and engage the splined section of the shaft;an arm extending from the keyed ring, wherein the arm is configured to provide leverage to limit rotation of the keyed ring and thereby interlocking rotation of the shaft when the keyed ring is engaged with the splined section of the shaft;a guide for the arm;a fastener configured to extend through a hole in the arm to hold the arm in a fixed position with respect to the guide;a wedge configured to be coupled to opposite sides of the arm with the fastener, wherein the wedge positions the arm such that the keyed ring engages the splined section of the shaft when the wedge is coupled to one side of the arm, and wherein the wedge positions the arm such that the keyed ring disengages the splined section of the shaft when the wedge is coupled to the other side of the arm. 14. The hoist of claim 13, wherein the wedge has a notch configured to receive the guide. 15. The hoist of claim 13, wherein the guide is fixed with respect to the platform and the arm is configured to slide axially along the guide so that the keyed ring may engage the splined section of the shaft. 16. A hoist, comprising: a platform;a drum supported by and configured to rotate with respect to the platform;a motor coupled to the drum and configured to rotate the drum;a shaft having a splined section and coupled to at least one of the drum and the motor, wherein the shaft communicates torque between the drum and the motor; andan interlock system, comprising: a keyed ring configured to slide onto and engage the splined section of the shaft;an arm extending from the keyed ring, wherein the arm is configured to provide leverage to limit rotation of the keyed ring and thereby interlocking rotation of the shaft when the keyed ring is engaged with the splined section of the shaft; anda second arm extending from the keyed ring opposite to the arm, wherein the arm, the second arm, and the keyed ring together form an integral locking bar. 17. The hoist of claim 16, further comprising a brake for the motor, wherein the locking bar engages the shaft between the motor and the brake. 18. The hoist of claim 16, wherein the interlock system further comprises a guide for the arm, wherein the guide is fixed with respect to the platform and the arm is configured to slide axially along the guide so that the keyed ring may engage the splined section of the shaft.
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이 특허에 인용된 특허 (8)
Niedzielski Donald A. (Bay City MI) Piziks Indulis (Saginaw MI) Oosterwal Dantar P. (Grand Blanc MI), Anti-theft steering shaft lock.
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