US3535071A - Mine props - Google Patents
Mine props Download PDFInfo
- Publication number
- US3535071A US3535071A US718458A US3535071DA US3535071A US 3535071 A US3535071 A US 3535071A US 718458 A US718458 A US 718458A US 3535071D A US3535071D A US 3535071DA US 3535071 A US3535071 A US 3535071A
- Authority
- US
- United States
- Prior art keywords
- shoe
- jack
- flanges
- prop
- mine
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 230000008602 contraction Effects 0.000 description 2
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D23/00—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor
- E21D23/04—Structural features of the supporting construction, e.g. linking members between adjacent frames or sets of props; Means for counteracting lateral sliding on inclined floor
- E21D23/0418—Positioning devices and stabilizing means for the props
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D15/00—Props; Chocks, e.g. made of flexible containers filled with backfilling material
- E21D15/50—Component parts or details of props
- E21D15/54—Details of the ends of props
Definitions
- a mine prop in the form of an extensible jack having laterally extending flanges secured to the lower end of the jack, and a shoe having internal projections for engagement with the laterally extending flanges to raise the shoe when the jack is contracted.
- the present invention relates to improvements to props used in mines to support the roof and it aims at providing a prop of which the lower shoe may be able to be raised by the contraction of the prop, mainly in order to facilitate the fitting up or the repair of a support pier.
- the lower end of the jack has laterally extending flanges adapted to engage with corresponding internal projections on a shoe so that contraction of the jack causes lifting of the shoe by engagement of the flange with the projections.
- each strap is clamped to the lower end of the jack body, each strap carrying a laterally extending flange with an arcuate profiled upper surface for engagement with a projection on the shoe. It is also preferred that the shoe has two I section longitudinal members, the upper internal flanges of which provide the shoe projections.
- FIG. 1 is a vertical section of the lower part of a prop
- FIG. 2 is an elevation, partly in section along the line 11-11 of FIG. 1, showing a support pier made with props according to the invention, and
- FIG. 3 reproduces FIG. 2 with one prop in the contracted position.
- FIG. 1 there is shown at 1 the body of the jack of a mine prop according to the invention.
- the body 1 is supported by a lower plate 2 provided with a hemi-spherical boss 211 so as to form a ball-and-socket joint in order to allow the free positioning of the jack with respect to the ground.
- a sliding stem 3 (FIG. 2) of which the upper end, or head, is secured to a support heading 4.
- This heading 4 is supported by two props which may form part of a pier in which two other props hold up a second heading.
- the thrust plate 2 is fitted inside a lower shoe 5 made in the form of a casing, of which the side walls, placed longitudinally in relation to the axis of the heading 4, are constituted by I sections 5a (FIG. 1).
- the upper side flanges of these sections 5a are spaced to give a considerable clearance for the passage of the base of the jack 1,
- a collar composed of two straps 6 of semi-circular section, joined together by two pairs of bolts 611.
- Each of these straps 6 has fixed radially to it a flange or stop 7 of a curvilinear triangular profile, it being noted that the edge of this flange 7 which is turned towards the chamfered edge 5b of the sections 5a has a profile of the arc of a circle of which the centre coincides with that of the hemispherical boss 2a of the thrust plate 2.
- the upper part of the shoe may carry a horizontal plate pierced by an opening shaped to work in conjunction with the flanges fixed to the base of the jack.
- a mine prop comprising an extensible jack, laterally extending flanges secured to the lower end of said jack, a shoe having internal projections for engagement with said flanges whereby said shoe is raised when said jack is contracted, and two semi-cylindrical straps clamped to opposite sides of said jack, each of said straps carrying a laterally extending flange with an arcuate profiled upper surface.
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Geochemistry & Mineralogy (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mechanical Engineering (AREA)
- Architecture (AREA)
- Bridges Or Land Bridges (AREA)
- Roof Covering Using Slabs Or Stiff Sheets (AREA)
- Conveying And Assembling Of Building Elements In Situ (AREA)
- Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)
Description
Oct. 20, 1970 MINE PROPS Filed April 3, 1968 R. BORE 3,535,071 v United States Patent 3,535,071 MINE PROPS Raymond Bore, 61 Rue des Ireelaude, 42 Saint Etienne, France Filed Apr. 3, 1968, Ser. No. 718,458 Claims priority, application France, Apr. 3, 1967,
Int. 01. 1521a 15/54 US. Cl. 248-357 2 Claims ABSTRACT OF THE DISCLOSURE A mine prop in the form of an extensible jack having laterally extending flanges secured to the lower end of the jack, and a shoe having internal projections for engagement with the laterally extending flanges to raise the shoe when the jack is contracted.
The present invention relates to improvements to props used in mines to support the roof and it aims at providing a prop of which the lower shoe may be able to be raised by the contraction of the prop, mainly in order to facilitate the fitting up or the repair of a support pier.
According to this inveition in a mine prop of the type which includes an extensible jack the lower end of the jack has laterally extending flanges adapted to engage with corresponding internal projections on a shoe so that contraction of the jack causes lifting of the shoe by engagement of the flange with the projections.
Preferably two semi-cylindrical straps are clamped to the lower end of the jack body, each strap carrying a laterally extending flange with an arcuate profiled upper surface for engagement with a projection on the shoe. It is also preferred that the shoe has two I section longitudinal members, the upper internal flanges of which provide the shoe projections.
A mine prop in accordance with the invention will now be described by way of example only, with reference to the accompanying drawings, in which:
FIG. 1 is a vertical section of the lower part of a prop,
FIG. 2 is an elevation, partly in section along the line 11-11 of FIG. 1, showing a support pier made with props according to the invention, and
FIG. 3 reproduces FIG. 2 with one prop in the contracted position.
In FIG. 1 there is shown at 1 the body of the jack of a mine prop according to the invention. In known manner, the body 1 is supported by a lower plate 2 provided with a hemi-spherical boss 211 so as to form a ball-and-socket joint in order to allow the free positioning of the jack with respect to the ground. There is associated with the body 1 a sliding stem 3 (FIG. 2) of which the upper end, or head, is secured to a support heading 4. This heading 4 is supported by two props which may form part of a pier in which two other props hold up a second heading.
The thrust plate 2 is fitted inside a lower shoe 5 made in the form of a casing, of which the side walls, placed longitudinally in relation to the axis of the heading 4, are constituted by I sections 5a (FIG. 1). The upper side flanges of these sections 5a are spaced to give a considerable clearance for the passage of the base of the jack 1,
"ice
the inside edges of the said flanges being chamfered, as shown at 5b.
There is also fixed to the base of the jack body 1 a collar composed of two straps 6 of semi-circular section, joined together by two pairs of bolts 611. Each of these straps 6 has fixed radially to it a flange or stop 7 of a curvilinear triangular profile, it being noted that the edge of this flange 7 which is turned towards the chamfered edge 5b of the sections 5a has a profile of the arc of a circle of which the centre coincides with that of the hemispherical boss 2a of the thrust plate 2.
It will be realised that because of their profile the flanges 7 leave the prop free to take up any direction in relation to the shoe 5. On the other hand, as shown in FIG. 3, when one of the two jacks 1-3 associated with each heading 4 is contracted, the lower body 1 moves axially upward, carrying with it the corresponding shoe 5, the flanges 7 coming to bear against the upper flanges of the sections 5a. The surface of the ground which forms the support for the shoe in question may thus be smoothed, or the lower face of the shoe may be reached, for example for repair.
It will be appreciated that there may be any number of the flanges 7. In the same way, in place of the I sections 5a, the upper part of the shoe may carry a horizontal plate pierced by an opening shaped to work in conjunction with the flanges fixed to the base of the jack.
It must moreover be understood that the preceding description has been given only by Way of example, and that it does not limit the scope of the invention which will not be avoided by replacing the constructional details described by any other equivalents.
I claim:
1. A mine prop comprising an extensible jack, laterally extending flanges secured to the lower end of said jack, a shoe having internal projections for engagement with said flanges whereby said shoe is raised when said jack is contracted, and two semi-cylindrical straps clamped to opposite sides of said jack, each of said straps carrying a laterally extending flange with an arcuate profiled upper surface.
2. A mine prop according to claim 1, wherein said shoe has two I section longitudinal members disposed so that the upper internal flanges of said I sections can engage on said arcuate profiled surfaces of said flanges.
References Cited UNITED STATES PATENTS 898,336 9/1908 De France 254-101 1,268,410 6/1918 Weber 254 101 XR 1,722,312 7/1929 Roos 248357 FOREIGN PATENTS 729,805 5/1955 Great Britain. 1,002,038 8/1965 Great Britain.
ROY D. FRAZIER, Primary Examiner A. FRANKEL, Assistant Examiner US; Cl. X.R. 254101
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR48490A FR1525394A (en) | 1967-04-03 | 1967-04-03 | Improvements to mine props |
Publications (1)
Publication Number | Publication Date |
---|---|
US3535071A true US3535071A (en) | 1970-10-20 |
Family
ID=9694706
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US718458A Expired - Lifetime US3535071A (en) | 1967-04-03 | 1968-04-03 | Mine props |
Country Status (4)
Country | Link |
---|---|
US (1) | US3535071A (en) |
DE (1) | DE1758097B1 (en) |
FR (1) | FR1525394A (en) |
GB (1) | GB1218616A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4384699A (en) * | 1979-01-11 | 1983-05-24 | Berger Gunvald M S | Device for load carrier supporting legs |
US5538364A (en) * | 1995-02-14 | 1996-07-23 | Huntsman; Steven D. | Yieldable mine post having a double ball and socket configuration |
US20100044548A1 (en) * | 2006-11-23 | 2010-02-25 | Artur Schwoerer | Prop head for ceiling formwork |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
PL117063B1 (en) * | 1978-09-15 | 1981-07-31 | Gorniczo Hutniczy Miedzi | Fast disconnectable coupling between a prop and its sill |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US898336A (en) * | 1908-04-22 | 1908-09-08 | Murrell R De France | Trench-brace. |
US1268410A (en) * | 1917-07-27 | 1918-06-04 | L A Schoenberg | Lifting-jack. |
US1722312A (en) * | 1926-07-13 | 1929-07-30 | Henry W Roos | Shore attachment |
GB729805A (en) * | 1953-05-22 | 1955-05-11 | Becorit Grubenausbau Gmbh | Improvements relating to pit props |
GB1002038A (en) * | 1960-09-22 | 1965-08-18 | Guenther Wilheim Hammer | Base plates for pit props |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1044741B (en) * | 1957-03-15 | 1958-11-27 | Alexander Schmidt Dr Ing | Removable hood base for pit stamp |
DE1134947B (en) * | 1960-03-23 | 1962-08-23 | Dowty Mining Equipment Ltd | Wandering pit lining to support the hanging wall |
DE1920016U (en) * | 1964-01-15 | 1965-07-22 | Guenther Wilhelm Hammer | INTERCHANGEABLE STAMP FOOT FOR PIT STAMP. |
DE1950609A1 (en) * | 1969-10-08 | 1971-04-15 | Hans Reissmann | Record cover with title flap |
-
1967
- 1967-04-03 FR FR48490A patent/FR1525394A/en not_active Expired
-
1968
- 1968-03-29 GB GB05100/68A patent/GB1218616A/en not_active Expired
- 1968-04-03 DE DE19681758097 patent/DE1758097B1/en not_active Withdrawn
- 1968-04-03 US US718458A patent/US3535071A/en not_active Expired - Lifetime
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US898336A (en) * | 1908-04-22 | 1908-09-08 | Murrell R De France | Trench-brace. |
US1268410A (en) * | 1917-07-27 | 1918-06-04 | L A Schoenberg | Lifting-jack. |
US1722312A (en) * | 1926-07-13 | 1929-07-30 | Henry W Roos | Shore attachment |
GB729805A (en) * | 1953-05-22 | 1955-05-11 | Becorit Grubenausbau Gmbh | Improvements relating to pit props |
GB1002038A (en) * | 1960-09-22 | 1965-08-18 | Guenther Wilheim Hammer | Base plates for pit props |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4384699A (en) * | 1979-01-11 | 1983-05-24 | Berger Gunvald M S | Device for load carrier supporting legs |
US5538364A (en) * | 1995-02-14 | 1996-07-23 | Huntsman; Steven D. | Yieldable mine post having a double ball and socket configuration |
US20100044548A1 (en) * | 2006-11-23 | 2010-02-25 | Artur Schwoerer | Prop head for ceiling formwork |
US8262056B2 (en) * | 2006-11-23 | 2012-09-11 | Peri Gmbh | Prop head for ceiling formwork |
Also Published As
Publication number | Publication date |
---|---|
FR1525394A (en) | 1968-05-17 |
DE1758097B1 (en) | 1970-08-20 |
GB1218616A (en) | 1971-01-06 |
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