US4603783A — Device on hoisting machinery for automatic contro…

Claim 1

Independent Claim 226 words

Device for hoisting machinery for atuomatically controlling the movement of a load carrier and for steadying the pendulum-type motion of a load suspended from said load carrier which motion occurs during acceleration or braking of the load carrier during the corresponding acceleration time interval or braking time interval, comprising a load carrier traction motor, a signal transmitter for sending control signals for controlling the movement of said load carrier traction motor, a signal progression for controlling the traction motor corresponds to a load carrier acceleration progression (b K ) symmetrical to the center (T/2) of the interval with maximum acceleration values (b K (0)) at the beginning and end of the interval and smaller minimum acceleration values between the values at the beginning and end of the interval, the signal progression produced by said signal transmitter (24) corresponds to a load carrier accelearion (b K ) monotonically decreasing or increasing between said maximum acceleration values (b K (0)), and when the following relationship applies to load carrier acceleration (b K ): ##EQU7## where V N is the difference in velocity before and after acceleration or braking, l represents the pendulum length of the load, g is the acceleration due to gravity, and n represents a whole number, and T o is the period (natural oscillation time of the pendulum) to which the following relationship applies: ##EQU8##

Claim 2

Dependent Claim 226 words

Device for hoisting machinery for atuomatically controlling the movement of a load carrier and for steadying the pendulum-type motion of a load suspended from said load carrier which motion occurs during acceleration or braking of the load carrier during the corresponding acceleration time interval or braking time interval, comprising a load carrier traction motor, a signal transmitter for sending control signals for controlling the movement of said load carrier traction motor, a signal progression for controlling the traction motor corresponds to a load carrier acceleration progression (b K ) symmetrical to the center (T/2) of the interval with maximum acceleration values (b K (0)) at the beginning and end of the interval and smaller minimum acceleration values between the values at the beginning and end of the interval, the signal progression produced by said signal transmitter (24) corresponds to a load carrier accelearion (b K ) monotonically decreasing or increasing between said maximum acceleration values (b K (0)), and when the following relationship applies to load carrier acceleration (b K ): ##EQU7## where V N is the difference in velocity before and after acceleration or braking, l represents the pendulum length of the load, g is the acceleration due to gravity, and n represents a whole number, and T o is the period (natural oscillation time of the pendulum) to which the following relationship applies: ##EQU8##

Claim 3

Dependent Claim 22 words

Device, as set forth in claim 1, including continuously monotonically decreasing or increasing the load carrier acceleration between said maximum acceleration values.

Claim 4

Dependent Claim 26 words

Device, as set forth in claim 1, including monotonically decreasing or increasing the load carrier acceleration at least in two stages between said maximum acceleration values.

Claim 5

Dependent Claim 32 words

Device, as set forth in claim 1, wherein said signal progression with constant basic acceleration corresponds to a substantially cosine-shaped load carrier acceleration progression (b K ) of at least one period.

Claim 6

Dependent Claim 52 words

Device, as set forth in claim 4, wherein said signal progression corresponds to a load carrier acceleration (b K ) determined so that the traction force (P) applied by said traction motor during the time interval(T) for accelerating said load carrier (14) and the load (10) is substantially constant (P O ).

Claim 7

Dependent Claim 59 words

Device as set forth in claim 5, wherein at a substantially constant pendulum length (L) for variable load masses (m L ), the signal produced by said signal transmitter is for each load the same and is determined so that the traction force (P) applied at the maximum load mass (m L ) is substantially constant (P O ).

Claim 8

Dependent Claim 207 words

Method for automatically controlling the movement of a load carrier driven by an electrical traction motor on hoisting machinery and of steadying the pendulum-type motion of a load suspended from the load carrier during the time interval of acceleration or braking comprising the steps of selectively supplying electrical power to the traction motor for controlling the movement of the load carrier, basing the selective supply of electrical power on a signal progression corresponding to a load carrier acceleration progression symmetrical to the center of a time interval for acceleration or braking with maximum acceleration values at the beginning and end of the interval and smaller minimum acceleration values between the beginning and end of the interval, and providing the signal progression corresponding to a load carrier acceleration (b A ) monotonically decreasing or increasing between the acceleration maximum values, and when the following relationship applies to load carrier acceleration (b K ): ##EQU9## where v N is the difference in velocity before and after acceleration or braking, l represents the pendulum length of the load, g is the acceleration due to gravity, and n represents a whole number, and T o is the period (natural oscillation time of the pendulem) to which the following relationship applies: ##EQU10##

Claim 9

Dependent Claim 207 words

Method for automatically controlling the movement of a load carrier driven by an electrical traction motor on hoisting machinery and of steadying the pendulum-type motion of a load suspended from the load carrier during the time interval of acceleration or braking comprising the steps of selectively supplying electrical power to the traction motor for controlling the movement of the load carrier, basing the selective supply of electrical power on a signal progression corresponding to a load carrier acceleration progression symmetrical to the center of a time interval for acceleration or braking with maximum acceleration values at the beginning and end of the interval and smaller minimum acceleration values between the beginning and end of the interval, and providing the signal progression corresponding to a load carrier acceleration (b A ) monotonically decreasing or increasing between the acceleration maximum values, and when the following relationship applies to load carrier acceleration (b K ): ##EQU9## where v N is the difference in velocity before and after acceleration or braking, l represents the pendulum length of the load, g is the acceleration due to gravity, and n represents a whole number, and T o is the period (natural oscillation time of the pendulem) to which the following relationship applies: ##EQU10##

Claim 10

Dependent Claim 21 words

Method, as set forth in claim 7, comprising the step of providing vanishing minimum acceleration values between the maximum acceleration values.

Claim 11

Dependent Claim 22 words

Method, as set forth in claim 7, including the step of continuously monotonically increasing or decreasing the acceleration between the maximum values.

Claim 12

Dependent Claim 23 words

Method, as set forth in claim 7, including monotonically decreasing or increasing the acceleration in at least two stages between the maximum values.

Claim 13

Dependent Claim 29 words

Method, as set forth in claim 7, wherein the signal progression with constant basic acceleration corresponds to a substantially cosine-shaped load carrier acceleration progression of at least one period.

Claim 14

Dependent Claim 44 words

Method, as set forth in claim 11, providing the signal progression in correspondence to a load carrier acceleration (b K ) and fixing the traction force during the time interval (T) for accelerating the load carrier and the load at a substantially constant value.

Claim 15

Dependent Claim 46 words

Method, as set forth in claim 12, including the steps of maintaining the pendulum length constant for different load masses (m L ) and producing the signal progression so that the traction force applied at the maximum occurring load mass (m L ) is substantially constant.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1989-08-04	1990-02-03	1990-08-05	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1993-08-04	1994-02-03	1994-08-05	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1997-08-04	1998-02-03	1998-08-05	$7700.00	Window Closed / Lapsed

Device on hoisting machinery for automatic control of the movement of the load carrier

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