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US3809318A Expired / Lapsed US ⏱️ 0.0 years remaining

Monitor for digging coal

Assignee: Mitsui Mining Co Ltd
•
Filing: 1972-10-31
•
Granted: 1974-05-07
•
Expires: 1992-10-31
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Abstract

Abstract The present invention relates to a monitor used in coal mines for digging coal. The impact of pressured water against a coal face through the nozzle of the monitor effects the coal digging operation. In working the coal face, coal thrown out from the coal face will clash against the monitor, and falling coal lumps will bury the monitor thus decreasing the efficiency of coal digging operation, and the known type of monitor has suffered damage from such severe conditions. According to the present invention, the above impediment has been for the most part eliminated by virtue of the novel constructions wherein the cylinder for raising and lowering the nozzle of the monitor is mounted just behind the monitor while the unit for turning the nozzle of the monitor is disposed under main water supply pipe and is received and closed in a housing. This construction has further advantages in that the full height of the monitor is markedly decreased and in that the stability thereof is greatly increased.

Inventors

  • 👤 M Yamamoto

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-02 17:23
CPC Classifications
E; E21; E21C; E21C25/00; E21C25/60; B; B05; B05B; B05B3/00; B05B3/14

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 170 words
A monitor for digging coal comprising a barge-like base plate, a main water supply pipe secured to said base plate, a tubular member rotatably held by said main water supply pipe, a two-way pipe having two tops and one bottom mounted on said tubular member, a pivotal nozzle member operably connected to said two way pipe and including a nozzle, a first water pressure cylinder for raising and lowering the nozzle of the monitor, said first cylinder being mounted behind said two-way pipe, a shaft projecting downwardly from the bottom of said tubular member, a pinion mounted on said shaft, a rack which engages with said pinion, a second cylinder having a piston-rod received therein said rack being connected to said piston-rod for turning the nozzle of the monitor in a horizontal plane, said shaft and rack and the second cylinder being received in and tightly surrounded by a housing member secured to the bottom of a holding member which grasps said tubular member held by said water supply pipe.
Claim 2
Dependent Claim 170 words
A monitor for digging coal comprising a barge-like base plate, a main water supply pipe secured to said base plate, a tubular member rotatably held by said main water supply pipe, a two-way pipe having two tops and one bottom mounted on said tubular member, a pivotal nozzle member operably connected to said two way pipe and including a nozzle, a first water pressure cylinder for raising and lowering the nozzle of the monitor, said first cylinder being mounted behind said two-way pipe, a shaft projecting downwardly from the bottom of said tubular member, a pinion mounted on said shaft, a rack which engages with said pinion, a second cylinder having a piston-rod received therein said rack being connected to said piston-rod for turning the nozzle of the monitor in a horizontal plane, said shaft and rack and the second cylinder being received in and tightly surrounded by a housing member secured to the bottom of a holding member which grasps said tubular member held by said water supply pipe.
Claim 3
Dependent Claim 72 words
A monitor for digging coal as set forth in claim 1 wherein the nozzle of the monitors is connected to said two-way pipe be means of a base tube which has an exit at the center of the length thereof and holding means connected to each of the tops of said two-way pipes and said base tube for rotatably supporting said base tube, said exit communicating with the nozzle of the monitor.
Claim 4
Dependent Claim 54 words
A monitor for digging coal as set forth in claim 1 wherein the first cylinder for raising and lowering the nozzle of the monitor is supported by two arms which protrude rearwardly, one of said arms being secured to said base tube the other being secured to the lower part of said two-way pipe.
Claim 5
Dependent Claim 36 words
A monitor for digging coal as set forth in claim 1 wherein the ejection of water can be carried out throughout the operation of handling the nozzle by using swivels in each of the holding means.

References Cited (Backward Citations)

SU176543A1 Cited
US803587A Cited
US965709A Cited
US2111553A Cited
US2698664A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1977-05-06 1977-11-05 1978-05-07 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1981-05-06 1981-11-05 1982-05-07 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1985-05-06 1985-11-05 1986-05-07 $7700.00 Window Closed / Lapsed

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