DE233771C - - Google Patents
Info
- Publication number
- DE233771C DE233771C DENDAT233771D DE233771DA DE233771C DE 233771 C DE233771 C DE 233771C DE NDAT233771 D DENDAT233771 D DE NDAT233771D DE 233771D A DE233771D A DE 233771DA DE 233771 C DE233771 C DE 233771C
- Authority
- DE
- Germany
- Prior art keywords
- pru
- sponsors
- corrugations
- weakened
- end faces
- 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.)
- Active
Links
Classifications
-
- 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
- E21D15/02—Non-telescopic 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
- E21D15/14—Telescopic props
- E21D15/16—Telescopic props with parts held together by positive means, with or without relative sliding movement when the prop is subject to excessive pressure
- E21D15/18—Telescopic props with parts held together by positive means, with or without relative sliding movement when the prop is subject to excessive pressure with one part resting on a supporting medium, e.g. rubber, sand, bitumen, lead, located in the other part, with or without expulsion or displacement of the medium upon excessive pressure
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)
- Feeding Of Articles By Means Other Than Belts Or Rollers (AREA)
- Advancing Webs (AREA)
Description
Hierzu ι Blatt Zeichnungen.
EEHLIN. OEDRUCKT IN DER lIEICHSßRUCKEREI.
Claims (1)
- Paten t-An s PRu c η :Nachgiebiger Grubenstempel aus mehreren durch Führungen zusammengehaltenen starren Teilen, dadurch gekennzeichnet, daß eine oder beide Endflächen aller oder einzelner Teile durch Riffelungen geschwächt sind.
Publications (1)
Publication Number | Publication Date |
---|---|
DE233771C true DE233771C (de) |
Family
ID=493683
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DENDAT233771D Active DE233771C (de) |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE233771C (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE758402C (de) * | 1940-04-18 | 1954-02-15 | Hugo Herzbruch & Soehne | Wanderpfeiler |
-
0
- DE DENDAT233771D patent/DE233771C/de active Active
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE758402C (de) * | 1940-04-18 | 1954-02-15 | Hugo Herzbruch & Soehne | Wanderpfeiler |
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