US3850308A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for accommodating the pendulum action of a load carried by a rope from a traveller
Assignee: Siemens AG
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Filing: 1973-03-01
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Granted: 1974-11-26
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Expires: 1993-03-01
Abstract
Abstract A method for suppressing the pendular movement of a load carried by a rope and movable with a traveller equipped with a speed regulated drive has the steps of: adapting the period of pendulum movement for an average rope length or a whole multiple of this period to the distance to be covered by the traveller by selecting the rated speed of the latter; accelerating the drive of the traveller at maximum rate up to said speed in the first quarter period of the pendulum movement; and then decelerating the traveller in the last quarter of the period or of a subsequent period at a rate corresponding to the maximum acceleration until the traveller is brought to standstill. An apparatus for performing the foregoing method has a control system for the drive. The system has a speed regulator with a circuit for selecting the rated speed of the drive to adapt the period of pendulum movement for an average rope length or a whole multiple of this period to the distance to be covered by the traveller. The system further has an acceleration controller for accelerating the drive of the traveller at maximum rate up to the rated speed in the first quarter of the period of the pendulum movement and then decelerating the traveller in the last quarter of said period at a rate corresponding to the maximum acceleration.
Inventors
- 👤 S Meyer
- 👤 R Klingf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:55
CPC Classifications
B; B66; B66C; B66C13/00; B66C13/04; B66C13/06; B66C13/063
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
199 words
Apparatus for accommodating the pendular movements of a load suspended by a rope on the traveller of a crane having a drive for said traveller including a speed regulating device, comprising an automatic regulating means for accelerating the traveller during the first portion of its travelled distance and for decelerating the traveller during the last portion of the distance so that the traveller and the load come to a standstill almost at the same time, said apparatus comprising, start-up means for said drive connected in series with said speed regulating device; a datum means to receive operator supplied distance of traveller movement and the pendular length of the load; an electronic calculator interconnecting said datum means and said drive means to calculate a traveller speed so that said distance is traversed in one or more whole periods of pendular movement, said calculator supplying a signal to said speed regulating device so that there is an interval of acceleration for the traveller, an interval of whole periods of pendular movements during which said traveller travels at said calculated speed and a final interval of deceleration when the traveller and the pendular movement come to a sUbstantial stop at said distance.
Claim 2
Dependent Claim
199 words
Apparatus for accommodating the pendular movements of a load suspended by a rope on the traveller of a crane having a drive for said traveller including a speed regulating device, comprising an automatic regulating means for accelerating the traveller during the first portion of its travelled distance and for decelerating the traveller during the last portion of the distance so that the traveller and the load come to a standstill almost at the same time, said apparatus comprising, start-up means for said drive connected in series with said speed regulating device; a datum means to receive operator supplied distance of traveller movement and the pendular length of the load; an electronic calculator interconnecting said datum means and said drive means to calculate a traveller speed so that said distance is traversed in one or more whole periods of pendular movement, said calculator supplying a signal to said speed regulating device so that there is an interval of acceleration for the traveller, an interval of whole periods of pendular movements during which said traveller travels at said calculated speed and a final interval of deceleration when the traveller and the pendular movement come to a sUbstantial stop at said distance.
Claim 3
Dependent Claim
60 words
Apparatus as claimed in claim 1, wherein the electronic calculator forms an output signal controlled by said datum means and the output signal of the electronic calculator so limits the start-up means that the zero point of the speed of the traveller coincides at said distance with the zero passage at the end of a period of the pendular movement.
Claim 4
Dependent Claim
124 words
Apparatus as claimed in claim 2, wherein the electronic calculator comprises an operational amplifier having a feedback channel, a multiplier and a limit value transmitter connected into the feedback channel, the operational amplifier having a transfer function for providing a voltage signal from the output to the start-up control, the transfer function corresponding to the equation: v2 - bmax. X tz X v + bmax. X s 0 wherein v is the speed of the traveller, b is the acceleration and s is the travel distance, the limit value transmitter having respective inputs for receiving the travel datum voltage signal and the voltage signal proportional to the paid-out rope length for determining the time tz corresponding to the integral period of the pendulum movement.
Claim 5
Dependent Claim
92 words
Apparatus as claimed in claim 1, wherein the electronic calculator so determines the traveller speed that the distance travelled by the traveller corresponds to at least two periods of the pendular movement and the drive of the traveller during the first period, which relates to the predetermined length of the rope, is linearly accelerated, and during the second period, which relates to the then predetermined rope length, is linearly decelerated to standstill whereas the speed reached at the end of the first period is kept constant during an additional arbitrary travel distance.
Claim 6
Dependent Claim
116 words
Apparatus as claimed in claim 4, wherein the electronic calculator means comprises a travel regulating device superimposed upon the speed regulating device and having start-up control means, a divider component having respective inputs for receiving the travel datum voltage signal and for receiving a voltage signal proportional to the paid-out rope length, said travel regulating device having a feedback channel, a multiplier connected into the channel, the divider component having an output connected to the multiplier and to the start-up control means, and an operational amplifier having an input for receiving the voltage signal proportional to the paid-out rope length, the amplifier having output connected to the start-up control means for shifting the start-up time thereof.
Claim 7
Dependent Claim
40 words
Apparatus as claimed in claim 5, wherein the output of the divider component and the output of the operational amplifier are each proportional to the value given by 2 pi Square Root l/g wherein l is the paid-out rope length.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-25 | 1978-05-27 | 1978-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-25 | 1982-05-27 | 1982-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-25 | 1986-05-27 | 1986-11-26 | $7700.00 | Window Closed / Lapsed |