US3890792A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Walking-props for mining galleries
Assignee: Individual
•
Filing: 1973-06-05
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Granted: 1975-06-24
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Expires: 1993-06-05
Abstract
Abstract A friction-type walking-prop system is provided for use in protecting tunnelling machines in mining galleries and drifts. The system has at least two sections joined together by doubleacting shifting jacks. Each section comprises double-acting loadbearing props which support a cross member. Each section is provided with means for enabling it to apply a pressure to the roof, when being shifted, the shoes of the load-bearing props beings at this time out of contact with the wall of the gallery.
Inventors
- 👤 Georges Alacchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:54
CPC Classifications
E; E21; E21D; E21D23/00; E21D23/0086; E21D23/0095
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
249 words
A walking-prop system for mining galleries, of the type adapted to be kept in contact with the gallery''s roof during shifting and comprising at least a front roof support frame and a rear roof support frame both arranged one behind another in the direction of advance, each of said support frames being constituted by a plurality of double-acting load-bearing props, a shoe carried by the lower-end of said load-bearing props and adapted to contact the floor of the gallery, a cap member connected to the upper end of said load-bearing props and adapted to contact the roof of said gallery, at least one double acting shifting jack disposed between said front and rear support frame and connecting the opposite ends of the cap members of each of said support-frames, wherein each support frame include at least a double acting supporting jack placed in front of the corresponding support-frame and pivotally connected on its upper end to the cap member of said support-frame and on its lower end to a front base shoe in contact with the floor of the gallery and also a double acting supporting jack placed in the rear of the corresponding support-frame and pivotally connected on its upper end to the cap member of the corresponding support-frame and on its lower end to a rear base shoe in contact with the floor of said gallery, and wherein the front base shoe and the rear base shoe of each support-frame are linked together by a connecting jack.
Claim 2
Dependent Claim
249 words
A walking-prop system for mining galleries, of the type adapted to be kept in contact with the gallery''s roof during shifting and comprising at least a front roof support frame and a rear roof support frame both arranged one behind another in the direction of advance, each of said support frames being constituted by a plurality of double-acting load-bearing props, a shoe carried by the lower-end of said load-bearing props and adapted to contact the floor of the gallery, a cap member connected to the upper end of said load-bearing props and adapted to contact the roof of said gallery, at least one double acting shifting jack disposed between said front and rear support frame and connecting the opposite ends of the cap members of each of said support-frames, wherein each support frame include at least a double acting supporting jack placed in front of the corresponding support-frame and pivotally connected on its upper end to the cap member of said support-frame and on its lower end to a front base shoe in contact with the floor of the gallery and also a double acting supporting jack placed in the rear of the corresponding support-frame and pivotally connected on its upper end to the cap member of the corresponding support-frame and on its lower end to a rear base shoe in contact with the floor of said gallery, and wherein the front base shoe and the rear base shoe of each support-frame are linked together by a connecting jack.
Claim 3
Dependent Claim
71 words
A walking-prop system comprising a pair of front support frames and a pair of rear support frames as claimed in claim 1 wherein said front support frames are disposed at a certain distance one besides the other and linked together by a common cross cap member, and wherein said rear support frames are disposed at a certain distance one besides the other and linked together by a common cross cap member.
Claim 4
Dependent Claim
61 words
A walking-prop system as claimed in claim 1, wherein the supporting jack at the front of each support frame slopes downwards towards the front from the corresponding cap member towards the floor of the gallery, whilst the supporting jack at the rear of each support frame slopes downwards towards the rear from the corresponding cap-member towards the floor of the gallery.
Claim 5
Dependent Claim
73 words
A walking-prop system as claimed in claim 1, wherein the rear base shoe of the front support-frame constitutes also the front base shoe of the rear support frame and is placed as intermediate base shoe between said front and rear support frames and wherein the rear supporting jack of said front support frame and the front supporting jack of the said rear support frame are pivotally connected to the same intermediate base shoe.
Claim 6
Dependent Claim
30 words
A walking-prop system as claimed in claim 1, wherein a correcting jack is pivotally connected to the load-bearing props supporting shoe and to the rear base shoe of each support-frame.
Claim 7
Dependent Claim
70 words
A walking-prop system comprising a pair of front support frames and a pair of rear support frames as claimed in claim 1, wherein said support frames of each pair are disposed, at a certain distance, one besides the other and linked together by a common cross cap member and wherein the front base shoe of each front support-frame is constituted by a common front base plate supporting a mining machine.
Claim 8
Dependent Claim
62 words
A walking-prop system as claimed in claim 6 wherein the common front base plate carries a turret adapted to rotate about a spindle perpendicular to said base plate and provided with an arm which is pivotally connected at one end to the turrent along an axis perpendicular to said turret and to its longitudinal axis and which supports a coal cutting machine.
Claim 9
Dependent Claim
35 words
A walking-prop system as claimed in claim 1 wherein a conveyor is disposed in front of the front base shoe of the front support frame and is linked to said front base shoe by jacks.
Claim 10
Dependent Claim
32 words
The combination of a plurality of walking prop systems as claimed in claim 1, the combination comprising a plurality of the aforementioned systeMs arranged parallel to one another and side by side.
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) | 1978-06-23 | 1978-12-23 | 1979-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-23 | 1982-12-23 | 1983-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-23 | 1986-12-23 | 1987-06-24 | $7700.00 | Window Closed / Lapsed |