US3273940A

US3273940A - Mining pick

Info

Publication number: US3273940A
Application number: US373391A
Authority: US
Inventors: Belugou Pierre
Original assignee: Charbonnages de France CDF
Current assignee: Charbonnages de France CDF
Priority date: 1963-06-20
Filing date: 1964-06-08
Publication date: 1966-09-20
Anticipated expiration: 1983-09-20
Also published as: GB1006819A; BE649497A; FR1368318A

Description

p 0, 1966 P. BELUGOU MINING PICK Filed June a. 1964 United States Patent 3,273,940 l /flNlNG PICK Pierre Belugou, Paris, France, assignor to Charbonnages de France, Paris, France, a pnhiic institution of France Filed June 8, 1964, Ser. No. 373,391 Claims priority, application France, June 20, 1963, 938,804, Patent 1,358,318 3 Claims. (Cl. 29981) It is known that, during the work of mining a mineral substance, a mining tool, for example an .auger pick or a coalcutter knife, gives rise to the production of fine dust.

Numerous devices are already known which permit this disadvantage to be overcome, these making use of the radial projection of jets of water during the operation of the mining machine, these jets being directed towards a zone located close to the cutting edge of the tool, either in front or on each side of this edge.

These devices are not always as effective as may be desired. In fact, they facilitate the agglomeration of the dust which is raised, and thus cause the blocking of the Water intake channels and the choking of the tool.

The present invention has for its object to produce a mining pick suitable for all kinds of machines such as coalcutting machines or boring machines, this pick being associated with a system of water injection of such a kind that the whole arrangement ensures a distribution of Water which is more effective than those known at the present time, without blockingup or choking.

The pick according to the invention is characterized in that it comprises a waterintake channel delivering perpendicularly into a spraying channel bored straight through the body of the pick.

In accordance with another characteristic feature, the water intake channel comprises a nozzle discharging into the spraying channel, the said nozzle having a smaller section that that of the spraying channel.

According to a further characteristic feature, the spraying channel is cylindrical at its middle and comprises a divergent portion at each of its extremities.

Accordingly to an advantageous feature, the cylindrical portion of the spraying channel is reduced to a length which is less than its diameter.

In an advantageous form of embodiment, the water intake channel is formed by a bore pierced longitudinally in the body of the pick, the spraying channel being pierced transversely in the head of the pick in the vicinity of the cutting edge.

In accordance with a further feature, the spraying channel is perpendicular to the direction of cutting of the pick, and its axis is located on the neutral axis of the pick.

Further characteristic features and advantages will be come apparent from the description which follows below, reference being made to the accompanying drawings, in which:

FIG. 1 is a section of a pick according to the invention taken along its plane of symmetry.

FIG. 2 is an end view with partial cross-section taken along a plane perpendicular to that preceding.

The water to be sprayed is distributed by the member (not shown) which carries the picks, a drum or an anger for example, by any device known per se and engaging in the extremity '11 of a waterintake channel 1 pierced in the body of the pick 2.

The other extremity 1-2 of the channel 1 is a nozzle of small diameter which is provided for the purpose of accelerating and spraying the jet of water. The nozzle 12 delivers into a bore 3. The spraying of the jet of water is accentuated by the impact of the jet of water against the surface 4 of the bore 3, and by the presence of two lateral milled portions '31 and 32.

The water is discharged from the pick in the form of tiny drops travelling at high speed, and these droplets are dispersed to the rear of the cutting edge of the pick in a zone in which the dust is concentrated. In this way, the dust is forced against the walls of the groove cut by the pick but does not collect in front of the cutting edge of the pick.

In order to eliminate with certainty all risk of blockingu-p the bore 3, there is an advantage, during the milling of the

orifices

31 and 32, in reducing the length of the bore 3 to a value less than its diameter. By this means, the particles having a diameter greater than or equal to that of the bore 3 cannot pass into it, and the other particles only have an extremely short time of passage through the bore 3, so that they are not able to become agglomerated during their passage through this bore.

On the other hand, it should be observed that the circulation of water in the pick also has the advantage of cooling the head.

It would still remain within the scope of the invention to modify the form or the arrangement of the waterintake and spraying channels, the means of distribution of Water by the member supporting the picks, the form and the arrangement of the lateral orifices of the spraying channel, this list and also the description having been given only by way of explanation and not in any limitative sense.

I claim:

1. An improved mining pick associated with a Waterinjection device, said pick comprising: a water-intake conduit discharging perpendicularly into a spraying conduit pierced right through the body of said. pick, and spraying conduit having a cylindrical middle portion which has a length less than its diameter and a divergent portion at each extremity of said spraying conduit; a nozzle on said intake conduit, and discharging into said spraying conduit, said nozzle having a section smaller than that of said spraying conduit.

2. A mining pick as claimed is claim 1, in which said water-intake conduit is constituted by a passage bored longitudinally in the body of said pick, said spraying conduit being bored transversely in the head of said pick in the vicinity of the cutting edge of said pick.

3. A mining pick as claimed in claim 11, in which said spraying conduit is perpendicular to the cutting direction of said pick, and the axis of said conduit is located on the neutral axis of the pick.

References Cited by the Examiner UNITED STATES PATENTS 2,008,768 7/1935 Neal 29981 X 2,191,699 2/1940 Stephens 175418 X 2,320,610 6/ 1943 Kandle 17539-3 X 2,619,054 11/1952 Bell 111-7 3,092,190 6/ 1963 Gruere l394 X ERNEST R. PURSER, Primary Examiner.

Claims

1. AN IMPROVED MINING PICK ASSOCIATED WITH A WATERINJECTION DEVICE, SAID PICK COMPRISING: A WATER-INTAKE CONDUIT DISCHARGING PERPENDICULARLY INTO A SPRAYING CONDUIT PIERCED RIGHT THROUGH THE BODY OF SAID PICK, AND SPRAYING CONDUIT HAVING A CYLINDRICAL MIDDLE PORTION WHICH HAS A LENGTH LESS THAN ITS DIAMETER AND A DIVERGENT PORTION AT EACH EXTREMITY OF SAID SPRAYING CONDUIT; A NOZZLE ON SAID INTAKE CONDUIT, AND DISCHARGING INTO SAID SPRAYING CONDUIT, SAID NOZZLE HAVING A SECTION SMALLER THAN THAT OF SAID SPRAYING CONDUIT.