US3706361A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety brake
Assignee: Lift Tech International Inc
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Filing: 1970-07-21
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Granted: 1972-12-19
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Expires: 1990-07-21
Abstract
Abstract A safety brake operable in the event of a support failure between contiguous load carrying component parts of elevating equipment such as the mast of a stacker crane in which the parts are normally supported one dependent on the other. Tapered brake shoes secured spaced apart on one of the component parts are normally held disengaged from a gripping bar vertically extending therebetween and secured to the other component part. In the event of failure in the normally connecting support structure, brake operation is triggered by an associated velocity-sensitive actuator enabling the shoes to be wedgedly forced into brake engagement with the gripping bar.
Inventors
- 👤 Walter A Paulssen
- 👤 Robert R Johnston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:07
CPC Classifications
F; F16; F16D; F16D63/00; F16D63/008; F16D2127/00; F16D2127/001; F16D2127/002
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
195 words
A stacker crane safety brake operable in the event of a support failure between relatively movable contiguous components of the crane mast comprising: a. actuatable means operably actuated in response to a support failure; b. a braking surface provided by a vertically extending member supported on one of said components; c. a braking unit secured to the other of said components and operable to effect braking engagement with said braking surface concomitantly with the operable actuation of said actuatable means; d. said braking unit including brake shoes and means maintaining said shoes in a first position displaced from braking engagement with said braking surface in the absence of a response by said actuatable means, means operable to effect a substantially linear shoe movement into a second position in a movement arrest braking engagement with said braking surface on occurrence of a response by said actuatable means and support means laterally surrounding said shoes in said second position to control dissipation of the arresting forces imposed by said braking engagement; and e. adjustment means including a push rod having a threaded connection presettable for varying the movement distance between said first and second brake shoe positions.
Claim 2
Dependent Claim
195 words
A stacker crane safety brake operable in the event of a support failure between relatively movable contiguous components of the crane mast comprising: a. actuatable means operably actuated in response to a support failure; b. a braking surface provided by a vertically extending member supported on one of said components; c. a braking unit secured to the other of said components and operable to effect braking engagement with said braking surface concomitantly with the operable actuation of said actuatable means; d. said braking unit including brake shoes and means maintaining said shoes in a first position displaced from braking engagement with said braking surface in the absence of a response by said actuatable means, means operable to effect a substantially linear shoe movement into a second position in a movement arrest braking engagement with said braking surface on occurrence of a response by said actuatable means and support means laterally surrounding said shoes in said second position to control dissipation of the arresting forces imposed by said braking engagement; and e. adjustment means including a push rod having a threaded connection presettable for varying the movement distance between said first and second brake shoe positions.
Claim 3
Dependent Claim
62 words
A safety brake accordIng to claim 1 in which said braking surface is provided by a vertical bar member, said shoes are arranged vertical and are tapered to a reduced dimension from their bottom toward their top, and there is included means operable when braking into said second position to wedgingly force said shoes substantially linearly into braking engagement with said bar.
Claim 4
Dependent Claim
42 words
a fixedly secured brake shoe holder having walls defining a central vertically extending cavity through which to receive said vertical bar member and including means supporting said brake shoes within said cavity between the defining walls thereof and said bar member; and
Claim 5
Dependent Claim
42 words
a fixedly secured brake shoe holder having walls defining a central vertically extending cavity through which to receive said vertical bar member and including means supporting said brake shoes within said cavity between the defining walls thereof and said bar member; and
Claim 6
Dependent Claim
24 words
A safety brake according to claim 2 in which said vertical bar member is floatingly connected to the component on which it is supported.
Claim 7
Dependent Claim
24 words
means maintaining said shoes in a first position displaced from braking engagement with said braking surface in the absence of a said support failure;
Claim 8
Dependent Claim
24 words
means maintaining said shoes in a first position displaced from braking engagement with said braking surface in the absence of a said support failure;
Claim 9
Dependent Claim
30 words
A safety brake according to claim 2 in which said brake shoes and bar member are generally always relatively positioned in the same vertical plane throughout engagement and disengagement therebetween.
Claim 10
Dependent Claim
43 words
biasing means urging said shoes from said first to said second positions and operable to wedgingly force said shoes in a substantially linear movement into a second position in braking engagement with said bar member on occurrence of a said support failure, and
Claim 11
Dependent Claim
43 words
biasing means urging said shoes from said first to said second positions and operable to wedgingly force said shoes in a substantially linear movement into a second position in braking engagement with said bar member on occurrence of a said support failure, and
Claim 12
Dependent Claim
95 words
a pin laterally extending outward from each of said shoes; and c. actuatable means operably actuated in response to a supPort failure for concomitantly effecting said movement of said shoes from said first to said second positions and comprising a vertically moveable push rod including a cross bar secured thereto operably engaging the pins on said brake shoes acting to offset said biasing means and maintain said shoes in said first position in the absence of a support failure and movable to release said brake shoes for brake engagement on occurrence of a support failure.
Claim 13
Dependent Claim
95 words
a pin laterally extending outward from each of said shoes; and c. actuatable means operably actuated in response to a supPort failure for concomitantly effecting said movement of said shoes from said first to said second positions and comprising a vertically moveable push rod including a cross bar secured thereto operably engaging the pins on said brake shoes acting to offset said biasing means and maintain said shoes in said first position in the absence of a support failure and movable to release said brake shoes for brake engagement on occurrence of a support failure.
Claim 14
Dependent Claim
32 words
A safety brake according to claim 2 in which said shoes each include toothed gripping surfaces facing the braking surface of said bar member for effecting a braking relation on engagement therebetween.
Claim 15
Dependent Claim
62 words
A safety brake according to claim 2 in which said braking unit support means includes a brake shoe holder fixedly secured thereto, said brake shoe holder having walls defining a central vertically extending cavity through which to receive said vertical bar member and there is means supporting said brake shoes within said cavity between the defining walls thereof and said bar member.
Claim 16
Dependent Claim
58 words
A safety brake according to claim 6 in which said actuatable means comprises said push rod vertically movable and operably engaging said brake shoes acting to maintain said shoes in said first position in the absence of a support failure response and movable to release said brake shoes for brake engagement on occurrence of a support failure response.
Claim 17
Dependent Claim
32 words
A safety brake according to claim 7 in which said shoes each include toothed gripping surfaces facing the braking surface of said bar member for effecting a braking relation on engagement therebetween.
Claim 18
Dependent Claim
36 words
A safety brake according to claim 8 in which said push rod actuatable means is operatively connected to a remote actuator apparatus sensitive to a support failure between said contiguous components for actuating said push rod.
Claim 19
Dependent Claim
39 words
A safety brake according to claim 8 including biasing means urging said shoes into braking engagement with the braking surface of said bar and offset by said push rod assembly in the absence of a response by said actuator.
Claim 20
Dependent Claim
28 words
A safety brake according to claim 10 in which at least some surfaces of said brake shoes other than the gripping surfaces thereof include a frictionless material thereon.
Claim 21
Dependent Claim
64 words
A safety brake operable in the event of a support failure between relatively movable contiguous components of an elevating device comprising: a. a braking surface provided by a vertically extending bar member supported on one of said components; and b. a braking unit secured to the other of said components and operable to effect braking engagement with said bar member; said braking unit including:
Claim 22
Dependent Claim
64 words
A safety brake operable in the event of a support failure between relatively movable contiguous components of an elevating device comprising: a. a braking surface provided by a vertically extending bar member supported on one of said components; and b. a braking unit secured to the other of said components and operable to effect braking engagement with said bar member; said braking unit including:
Claim 23
Dependent Claim
28 words
A safety brake according to claim 12 including shim means supported contiguous to said pins for guiding movement thereof between the first and second positions of said shoes.
Claim 24
Dependent Claim
43 words
A safety brake according to claim 12 in which said bar member is supported on a first mast section of a stacker crane and said braking unit is supported on a second mast section of the stacker crane contiguous to said first section.
Claim 25
Dependent Claim
66 words
A safety brake according to claim 12 in which the elevating device comprises a stacker crane having a mast including said movable contiguous components, said braking engagement being effective for a movement arrest with the shoes in said second position and there is included support means laterally surrounding said shoes in said second position to control dissipation of the arresting forces imposed by said braking engagement.
Claim 26
Dependent Claim
28 words
A safety brake according to claim 15 including shim means supported contiguous to said pins for guiding movement thereof between the first and second positions of said shoes.
Claim 27
Dependent Claim
43 words
A safety brake according to claim 15 in which said bar member is supported on a first mast section of a stacker crane and said braking unit is supported on a second mast section of the stacker crane contiguous to said first section.
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) | 1975-12-19 | 1976-06-19 | 1976-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-19 | 1980-06-19 | 1980-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-19 | 1984-06-19 | 1984-12-19 | $7700.00 | Window Closed / Lapsed |