US3799602A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for handling material
Assignee: British Iron and Steel Research Association BISRA
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Filing: 1973-02-06
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Granted: 1974-03-26
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Expires: 1993-02-06
Abstract
Abstract An apparatus is described for use in converting an electromagnetic grab to function as a mechanical grab. The apparatus includes a frame within which the magnet block of a conventional electro-magetic grab is locatible and a two part core assembly of magnetic material hydraulically coupled to the grab arms of the apparatus. Energisation of the magnet block causes progressive movement of the core assembly towards the block actuating closing movement of the arms, whilst a hydraulic reservoir assists in procuring movement of the arms after de-energisation of the magnet block.
Inventors
- 👤 W Laws
- 👤 E Hyde
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:09
CPC Classifications
B; B66; B66C; B66C1/00; B66C1/04; B66C1/06; B66C3/00; B66C3/14; B66C3/16
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
186 words
Apparatus attachablE to an electro-magnetic grab for handling non-magnetic materials including: a frame connectible to the grab, lifting arms movable relative to the frame, and a core movable relative to the frame, the arms and the core being operatively connected together so that, in use, when the frame is connected to the grab, energisation of the magnet block of the grab will attract the core towards the block thus closing the arms into a material-holding position, subsequent de-energisation of the block allowing the arms to open into a fully open material-releasing position, the core being formed in two parts of magnetic material capable of limited relative movement, the parts being arranged so that in the fully open position of the arms the first part is located closer to the magnet block than the second part, movement of said first part towards the block carrying said second part towards the block and partially closing the arms, and said second part being capable of further movement towards the block after the first part has moved its full extent in order to complete the closing movement of the arms.
Claim 2
Dependent Claim
186 words
Apparatus attachablE to an electro-magnetic grab for handling non-magnetic materials including: a frame connectible to the grab, lifting arms movable relative to the frame, and a core movable relative to the frame, the arms and the core being operatively connected together so that, in use, when the frame is connected to the grab, energisation of the magnet block of the grab will attract the core towards the block thus closing the arms into a material-holding position, subsequent de-energisation of the block allowing the arms to open into a fully open material-releasing position, the core being formed in two parts of magnetic material capable of limited relative movement, the parts being arranged so that in the fully open position of the arms the first part is located closer to the magnet block than the second part, movement of said first part towards the block carrying said second part towards the block and partially closing the arms, and said second part being capable of further movement towards the block after the first part has moved its full extent in order to complete the closing movement of the arms.
Claim 3
Dependent Claim
44 words
Apparatus as claimed in claim 1 in which said second part is connected to a piston and cylinder assembly arranged so that upon movement of said second part towards the magnet block fluid is displaced to actuate fluid operated rams connected to the arms.
Claim 4
Dependent Claim
46 words
Apparatus as claimed in claim 2 including a pressurisable fluid reservoir operatively connected to the rams in such manner that, upon closing movement of the arms, fluid is displaced into the reservoir producing a force tending to open the arms when the magnet block is de-energised.
Claim 5
Dependent Claim
30 words
Apparatus as claimed in claim 3 in which said first part of the core assembly is rigidly connected to a first sleeve slidable on a pillar extending within the frame.
Claim 6
Dependent Claim
25 words
Apparatus as claimed in claim 4 in which said second part is rigidly connected to a second sleeve slidably mounted relatively to said first sleeve.
Claim 7
Dependent Claim
15 words
Apparatus as claimed in claim 4 wherein said pressurisable reservoir is disposed within said pillar.
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) | 1977-03-25 | 1977-09-24 | 1978-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-25 | 1981-09-24 | 1982-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-25 | 1985-09-24 | 1986-03-26 | $7700.00 | Window Closed / Lapsed |