Improvement in wood-screws
US RE6729 E
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Description (OCR text may contain errors)
Fig 2 Witnesses,-
' and forms to which my improvement may be head ofthe screw in which the slot or nick 5 are plan views of that shown in Fig. 2. as to the head of the screw. This insures perspending parts.
STATESAPA'I'ENT emet- AL LAN CUMMINGS, OF New YORK, N. Y., AssxoNoR To THE new YORK scREw COMPANY, or SAME PLACE.
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Specification farming..." of Lem" Patent No. 1,390, dated March so, 1875; reissue No. 0.790. dated November 9, 1875; application filed August 4, 1875.
.To all whom it niayconeem: v a I It is a well-known and fully-established fact Be it known that I, ALLAN-CUMMINGS, of .that theordinaryscrew-head, which is provided the city, county, and State of New York, have with a narrow shallow slot or nick, milled invented an Improvementin Screws, of which across its facefin which slot the driving-lever the following is a specification: I is applied, is very susceptible to injury'caused The object of my invention is to provide a mainly by the frequent slipping of the screwscrew of any and all varieties, so constructed driver from the slot when the screw is being that they may be readily inserted and-driven set home in either wood or metal, or being home, or withdrawn when desired, with great withdrawn from the same. It is also not an rapidity and safety, without the slightest danunusual occurrence to have one half of the gelof injuring the head of the screw, or the screw-head split 01? whenever an extra amount work into which the screw is being driven,by of power is applied through the ordinaryscrcwthe reason of the slipping of the driving indriver. These mishaps are so common as to strumept. In order to fully and satisfactorily be notorious among the manufacturers and accomplish this object, I form in the center of mechanics who use-large numbers of screws, the head ofa screw of any shape, size, or style, and. the loss resulting from 'them annually or adapted to any purpose, a deep cavity or amounts to large sums of money. It is to enhole of suitable shape, into which cavity or tirely obviate all of these difliculties, to gain hole a properly-shaped driving-tool,coinciding additional strength in the screw-head, and ininform with that of the cavity, is inserted, and creased driving-power, also to render it absofurnishes the leveragefor driving or-withdrawlutely impossible to injure the screw-head in ing the screw. In carrying out my invention any manner, that I have made my present in- I have made this cavity or hole angular in vention. Large quantities of what are known shape, this form being best adapted for the as capped screws, for ornamental purposes purpose by reasonof its furnishingvthe best are now made and extensively used in fittlng. form for giving increased power, as well as for and finishin g up the interior of cars, stages, the additional reason that it is the most readcoaches, in furniture. and other similar purily formed in the screw-head. Any angular- ,poses. The heads of these screws, either flat shaped cavity other than square will fully anor rounded, are covered with a thin metallic swer the purposes of my invention. plate, which is plated with gold,siver,or'nickel,
In the following description I have carefully as may be desired- In the process of capping pointed out and described the various modes the plate is cut away from that portion of the applied and adapted. is formed. This metallic cap or cover being In the drawings which form a part of this very thin, the utmost nicety in use is called specification, Figure 1 represents an elevation, for. In drivingthem with the ordinary screw-- partially in section, of an ordinary wood-screw driver it is very common for it to slip from the having a round head, and showing the applislot, tearing up the cap, and thus spoiling its cation of my invention when combined with appearance and necessitating its beingthrown the usual slot. Fig.2 is an elevation, partially aside. It will readily be seen that by dispensin section, of an ordinary screw, from the head ing with the usual slot or nick in this class of of which the usual slot is omitted and an anscrews, and using in lieu thereof a cavity of gular cavity only used. Fig. 3 is a plan view angular shape formed in the center of the head of the head of the ordinary screw, with slot and a properlyshaped driving-tool, perfect and cavity as shown in Fig. 1; and Figs. 4 and safety is insured to themetallic cap, as well 7 Similar letters of reference indicate correfeet work and absolutely guarantees no loss of screws. The process of capping is also sim- 'of the ordinary shape.
plified by reason of the absence of the slot or that my in vention, col'nbined with the im proved form of driving-tool, proves its great utility and advantages. Screws that have been long embedded and rusted in are diflicult to remove with an ordinary screw-driy'enit invariably slipping from the slot, repeating the sameuntil it is utterly impossible to start the screw from its bed. or to obtain any hold in the then damaged slot or nick. The screw has then to be removed by cutting out, to the great damage of the. work in which it was located. My invention completely eradicates all this trouble, as a screw having a cavity in its head is readily andsurely withdrawn at the first trial.
In Fig.1 I have shown a round-headed screw In the center of the screw-head is formed a deep angular cavity, which is of such shape and depth as may, in practice,'be found to be bestand necessary to fully accomplish the objects of my invention. This cavity is designated by the letter 11, in the various figures of the drawings. I have found the square-sided cavity', as shown in Fig. 3, the
most preferable angular form, but it may be made either octagonal, triangular, or other angnlar form, as illustrated'in Figs. 4 and 5. It may be made the same size its entire depth, or, if preferred, made slightly tapering from top to .bottom. These cavities may be'formed in the screw-head by the screw-machine at the same time the screw is being formed, or they may be madein a distinct machine, as a separate process from the formation of the screw itself. These operations are well-known mechanical processes, and, being no part of my present invpntion, require no detailed description herewit 1.
It is obvious that my improvement may be readily applied to all of the known forms of screws, both machine and wood.
Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is- I A screw the head of which, at its center, is provided with an angular cavity in lieu of the usual slot or nick, substantially as and for the purposes as herein shown and described.
I ALLAN CUMMINGS. In presence of-- A. L. MUNSON, R. J. GRIFFITH.