US3852649A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Material handling apparatus with carriage drive means
Assignee: WHITNEY CORP W
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Filing: 1973-11-07
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Granted: 1974-12-03
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Expires: 1993-11-07
Abstract
Abstract A carriage is movable along a roller conveyor and supports a gaging probe for detecting the position of a beam adapted to be advanced by the conveyor. The carriage is driven by an a.c. induction motor which is uniquely controlled to keep the probe pressed into engagement with the end of the beam at all times while avoiding burning out of the motor when the beam is stopped and the motor is stalled.
Inventors
- 👤 L Kindgren
- 👤 W Scott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:34
CPC Classifications
B; B65; B65G; B65G13/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
256 words
The combination of, a power-driven, reversible conveyor adapted to support an elongated structural member for movement in an endwise direction, control means selectively operable to advance, reverse and stop said conveyor and the supported member, a carriage movable forwardly and rearwardly along said conveyor and having an element engageable with the forward end of said member, a reversible a.c. induction motor for moving said carriage, and means responsive to said control means for supplying said motor with: a. a first voltage for causing said carriage to move reversely when said member is moved reversely, said first voltage being of sufficient magnitude to cause said carriage, in the absence of said member, to move at a rate greater than the rate of said member thereby to keep said element in engagement with said member; b. a second voltage for causing said carriage, in the absence of the member, to move reversely when said member is stopped, said second voltage being of lower magnitude than said first voltage so as to cause said element to remain pressed against the stopped member without said motor developing excessive heat; and c. a third voltage for causing said carriage to tend to move forwardly when said member is moved forwardly, the magnitude of said third voltage being insufficient to advance said carriage at a rate greater than the rate of said member whereby said element is held in engagement with said member while said motor reduces the force with which said member must push said carriage to move the latter forwardly.
Claim 2
Dependent Claim
256 words
The combination of, a power-driven, reversible conveyor adapted to support an elongated structural member for movement in an endwise direction, control means selectively operable to advance, reverse and stop said conveyor and the supported member, a carriage movable forwardly and rearwardly along said conveyor and having an element engageable with the forward end of said member, a reversible a.c. induction motor for moving said carriage, and means responsive to said control means for supplying said motor with: a. a first voltage for causing said carriage to move reversely when said member is moved reversely, said first voltage being of sufficient magnitude to cause said carriage, in the absence of said member, to move at a rate greater than the rate of said member thereby to keep said element in engagement with said member; b. a second voltage for causing said carriage, in the absence of the member, to move reversely when said member is stopped, said second voltage being of lower magnitude than said first voltage so as to cause said element to remain pressed against the stopped member without said motor developing excessive heat; and c. a third voltage for causing said carriage to tend to move forwardly when said member is moved forwardly, the magnitude of said third voltage being insufficient to advance said carriage at a rate greater than the rate of said member whereby said element is held in engagement with said member while said motor reduces the force with which said member must push said carriage to move the latter forwardly.
Claim 3
Dependent Claim
48 words
The combination defined in claim 1 in which said third voltage is of lower magnitude than said second voltage and is not sufficiently high to cause said motor to advance said carriage forwardly when said element is not in engagement with and being pushed forwardly by said member.
Claim 4
Dependent Claim
53 words
The combination defined in claim 1 further including additional means for controlling said motor independently of said control means and selectively operable to de-energize said motor and to cause the motor to be supplied with voltages of sufficient magnitude to cause said carriage to move forwardly and reversely when said member is absent.
Claim 5
Dependent Claim
30 words
The combination defined in claim 1 in which said motor is a three phase motor and in which said first voltage is less than the rated voltage of said motor.
Claim 6
Dependent Claim
176 words
The combination of, a power-driven, reversible conveyor adapted to support a member for movement along a linear path, control means selectively operable to advance, reverse and stop said conveyor and the supported member, a carriage movable along said conveyor and having an element engageable with the forward end of said member, an a.c. induction motor for moving said carriage, and means operable to supply said motor with: a a first voltage for causing said carriage to move reversely when said member is moved reversely, said first voltage being of sufficient magnitude to cause said carriage, in the absence of said member, to move at a rate greater than the rate of said member thereby to keep said element in engagement with said member; and b a second voltage for causing said carriage, in the absence of the member, to move reversely when said member is stopped, said second voltage being of lower magnitude than said first voltage so as to cause said element to remain pressed against the stopped member without said motor developing excess heat.
Claim 7
Dependent Claim
176 words
The combination of, a power-driven, reversible conveyor adapted to support a member for movement along a linear path, control means selectively operable to advance, reverse and stop said conveyor and the supported member, a carriage movable along said conveyor and having an element engageable with the forward end of said member, an a.c. induction motor for moving said carriage, and means operable to supply said motor with: a a first voltage for causing said carriage to move reversely when said member is moved reversely, said first voltage being of sufficient magnitude to cause said carriage, in the absence of said member, to move at a rate greater than the rate of said member thereby to keep said element in engagement with said member; and b a second voltage for causing said carriage, in the absence of the member, to move reversely when said member is stopped, said second voltage being of lower magnitude than said first voltage so as to cause said element to remain pressed against the stopped member without said motor developing excess heat.
Claim 8
Dependent Claim
87 words
The combination defined in claim 5 in which said last-mentioned means are operable to supply said motor with a third voltage for causing said carriage to tend to move forwardly when said member is moved forwardly, the magnitude of said third voltage being insufficient to advance said carriage at a rate greater than the rate of said member whereby said element is held in engagement with said member while said motor reduces the force with which said member must push said carriage to move the latter forwardly.
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) | 1977-12-02 | 1978-06-03 | 1978-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-02 | 1982-06-03 | 1982-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-02 | 1986-06-03 | 1986-12-03 | $7700.00 | Window Closed / Lapsed |