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)
- Roof Covering Using Slabs Or Stiff Sheets (AREA)
- Conveying And Assembling Of Building Elements In Situ (AREA)
- Bridges Or Land Bridges (AREA)
- Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR48490A FR1525394A (fr) | 1967-04-03 | 1967-04-03 | Perfectionnements aux étançons de mines |
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 (de) |
DE (1) | DE1758097B1 (de) |
FR (1) | FR1525394A (de) |
GB (1) | GB1218616A (de) |
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 (de) * | 1957-03-15 | 1958-11-27 | Alexander Schmidt Dr Ing | Abnehmbarer Haubenfuss fuer Grubenstempel |
DE1134947B (de) * | 1960-03-23 | 1962-08-23 | Dowty Mining Equipment Ltd | Wandernder Grubenausbau zur Abstuetzung des Hangenden |
DE1920016U (de) * | 1964-01-15 | 1965-07-22 | Guenther Wilhelm Hammer | Auswechselbarer stempelfuss fuer grubenstempel. |
DE1950609A1 (de) * | 1969-10-08 | 1971-04-15 | Hans Reissmann | Schallplattenhuelle mit Titelklappe |
-
1967
- 1967-04-03 FR FR48490A patent/FR1525394A/fr not_active Expired
-
1968
- 1968-03-29 GB GB05100/68A patent/GB1218616A/en not_active Expired
- 1968-04-03 US US718458A patent/US3535071A/en not_active Expired - Lifetime
- 1968-04-03 DE DE19681758097 patent/DE1758097B1/de not_active Withdrawn
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 (fr) | 1968-05-17 |
GB1218616A (en) | 1971-01-06 |
DE1758097B1 (de) | 1970-08-20 |
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