US899455A - Pick-head usable with removable points. - Google Patents

Description

, v J. MAZLIH'. PICK HEAD, USABLE WITH REMOVABLE POINTS.

' .LPiLIOATIOE mum rim. '24. mos.

899,455, Patented Sept. 22,1908.

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lnwraza ?.5irs mztni. or asnsrzn'roir. QUEENSLAND, aus'rromu.

are. 899,456.

Specification of Lettem Patent. Application filed February 24, 190;. Serial No. 417,685.

Hort-HEAD UsaBLE wrm imiaovanm 20mm.

Patented Sept. 22, 1908.

o :2?! 2117mm 1'. may concern:

Be it known that I, James Mazux, a subjcct of the King, or Great Britain and Ireland, fro, residing at Berber-ton, in the State of Queensland, ornmonncalth of Australia,

have invented certain new and useful Improvements Relating to Pick-Heads Usable with Removable Points and the Like: and I do hereby declare the following to be afull, clearand exact description of the invention, such as will enable others skilled in the art to which itappeflains: to make and use the same;

This invention relates to those picks which have a head ads ted to receive and hold se- CUEElF a rem'ovaole point or points (of drill steel for example: shaped to the require ments of the user.

Owing to pick points becoming: blunt qtllftavoidance. of expense and inconvenience to point. Picks rec vc exceptionally severe and saddenstrat and shocks; they are used in dark places and by unskilled men: and to be of thedesired practical value they must be elzrcnteiv strong: yet simple in construction, and their points must be extremely east to remove ye: not ca )t1l)l0 of being dislot gird or loosened when they should remain fixed in their sockets. Sundry previous inventions introduce removable points, but have not all the advantages above 111811- tioned; the present invention has them.

- A pick head is used having an eye to receive a; handle, and socketedto receive the shank of one, or the shanks of two points. When a worn or broken point is to be removed. the workman can take. in hand the oint to be, substituted, and with. one blow v it an the exposed rear of the shank of the point tobe'renioved. he can iunncdiatc' drive the latter out of its socket which compltely surrounds the-part ol' the shank it engage Details ofthis invention are indicated in the accompanying drawings.'from which it will be observed that a so mrate rear wedge is usable asan auxiliary to iolda oint in lace though there are no holes in tli pick iead sides to weaken it. There is no slot along the top to become ehokedby rock or prove a source of weakness to the s cket. or allow of the point being improperly, oosened. The shankof the point is not. limited in length,

especiaa y in navvymg. mining. and mthzm work. I? is a saving of time and an and the socket being open at its front and rear ends onlr, a firm bearing surrounding a considerable length of the shank is thus provided. Figure 1 shows in plan view a )iek head having asocket for one point. ig 2 rep resentsin side elevation the pick head of Fig. l, fitted with a )oint of drill steel, or

other suitable materia which when worn can be rcadilv shar cncd. W W

P view of the pic headof Fig. 4. Fig. 4 is a side elevation, partly sectional, of a pickhead, dill'erent in detail from Fig. 2, fitted with a point, for the removal of which a key is shown.

The pick head'c has an eye, as illustrated, for the handle.

dis a hummer head. b a strengthening lug for the support of the handle. A. the removabh- )oint, has a shank g with rear face The sliank is tapered or so formed that it will wedge or he grip )ed tightly when forced into the socket or pcrl'oration h.

Head 0 at a n'edctern'iined distance from one or both ends of the handle eye, rises to form an ear orears 7'. perforated iongitudina-ily by a socket h, which has a rear 0 )cningi and is located at a higher level than t to top of the handle eye. It is important that the handle top should be left visible, so that the handle end can pro]ect more or less from time to time as needed to fix it, and so that if the handle tends to loosen a tightening wedge or device can be readilv inserted.

Shank 9 projects from hole 2'. and may roject over or'bovond the handle. even w \en' the'lattcr projects (as it often does in practice) above its eve, as-for cxaniplc-up to line 6, Fig. 2. -lhe shank projects (in some cases) 9 from holcisome distance before reaching a point over thehandle. If the handle pro- Jects so muc-ltabove top edge lof head 0 as to come opposite hole i, shank g mav still project visibly from that hole, and allow of easy removal. Partof risiug car botwenneilge k and hole end i is marked m. By giving a blow along line 7 Fig. 2 against end 1', point e is removed.

When it be desired to more positivelv lock shank g, it is done at the rear part which pro: jects from hole 1'. Thus a cotter is driven transversely through a hole (I provided in the shank; this cotter will be always in sight, and can be inserted or left out at will, and itcaves socket Ii unaltered. In Fig. 4 socket It has a base line 0 which

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