US43384A - Machine for driving screws - Google Patents

Description

A. M. BAILEY 8v J. 0. COUCH.

MACHINE FOR DRIVING SCREWS.

N0 43,384 Patented July 5, .1864;

UNITED STATES PATENT OFFICE..A

ALFRED M. BATLFY AND JOHN o. (lotion, OF MIDDLEFTELD, CONNECTICUT.

MACHINE FOP. DRIVING scaEws.

speciauon forming pan nr Leners Paten't'NII, 43,384, nm-i .my o, ia64.

. lowing is a full, clear, and exact description of the same, reference being had to the .accompanying drawings, in which- Figure 1 is a side, and Fig. 2 a sectional, elevation of the said machine.

In the construction of many articles made of wood, orpartly ot' wood and partly of'iron,

external screws are used for fastening the pieces of wood, or wood and meta-l, together. The screws are generally penetrated into the wood by Screwdrivers 'tt'irned by hand', an

operation slow and fatiguing, and therefore expensive.

The object ofthis invention is to drive wood`` screws by machinery-that is to say, by means of a mechanism receiving movement from a prime mover and transmitting it tothe screw driving tool in such manner as that its work shall or may be perf'orI-ned with'speed, accuV4 racy, and ease; and our invention consists, first, 1n the production of anorgani'zed Inachine or apparatus or tool for driving woodscrews arranged and combined to operate as hereinafter described when actuated by a prime mover; second, 1n the combination with a suitable frame holding in fixed bearings the screw-driver, and with a platform to support the work to beoperated upon,of a mechanism .for elevating the platform to the driver, substantially in the manner and for the purposes hereinafter described 5I third, in the method of'Y operating, the screw-driver by a' friction' dcvice, substantially as described, the same con sisting of a pair of' friction pads or clutches upon the tool-holder and its surrounding pulley-shaft, respectively arranged forv action in conjunction with the Inovable platform, asdescribed, so that by elevating the platform to the screwdriver the pads or clutches will be brought into frictional contact, whereby rotary motion may be im parted to the tool or stopped and its speed checked at pleasIne.V

To enable others to make and use our improved machine, we shall now proceed to del scribe its construction and operation.

rilhe f'I'aIncwt-irl, which is firmly seated or established upon a base, G, is composed of a column or standard, A, from which branch Ott' brackets B, cast in one piece therewith, or riveted or bolted or oth erwise secured thereto. The loweruiost bracket supports a platform, D, through anA orifice, d, of which passes the guide-post E, whose upper end supports the table or platform G, upon which the work to be operated upon is laid, while its lower end passes through an orifice, d', in the base ofthe machine. A pulley, H, is hung In or to the said bracket, and a cord, h, fast to the guidepost, passes over it and terminates at the pedal-lever I, hinged or pivotedat ein the rear ot' the standard. By this arrangement the platform Gis elevated bythe operator depressing with his foot thev pedal e, the downward motion of the latter operating the corti over the pulley and raising the platform in a .line determined by thc two orifices d and d',

which orifices are in line with those which hold the tool. The twouppermost brackets or collars hold in their orifices a hollow shaft, K, upon which is mounted the pulley L, which receives its motion from a prime mover and transmits it tothe tool in the manner herein- I after described. The hollow shaft K terminates at-its lower `end with or in an annular- .friction-pad, M, secured to the shaft by means of a set-scrcw, m. The Vunder surface of this pad may be roughened or indented for the purpose of' giving a more powerful gripe or frictional hold. vThrough this hollow shaft and a collar, B', in line with the other collars before referred to, passes the tool-holder N, the screw-driver being inserted in the socket in the lower end of the said holder by mea-nsf.

of' a set-screw, n. t,

driving-shaft to be properly coupled for operation. The descentof the tool-holder is lim; ited by -means of a stock, P, securely held in its place by means of a set screw, p. Around the screw-driver or tool proper there is a cap or block, It, the interiorof which is hollow or concave, the edges being beveled inward and outwardly. 'Between lthe cap and the toolholder there is a spiral spring, the tendency of whichis to depress the cap below' the under side of the screw-driver. n

` A machine constructed' as above described is or may be operated in .fthe manner as follows The pieces of wood or metal which are to be united' by means of screws are laid or held upon l the blatforln Gr under anV adjustment in suchrelation to the screw-driver that on raisingthe platform by the-action of the foot on the pedal the-'cap R will coincide with and inclose. the head of the screw. When thisv adjustment is effected, it will be understood' thatthe axis `of the guide-post E, the toolholder M, and the pulley L and its shaft Rare all inf'thesame line, and that rotary motion p being imparted to either part it will revolve upon anv axis of revolution, which is the eem-v 'mon-'axis referred to. Rotary motion being' imparted to the pulley andiurther pressure being exerted on the pedal, the work will be crowded against the screw-driver and'p'ush it and its holder up through the hollow shaft K until'its friction-pad M comes in contactv with the pad Mof the pulley-shaft. From this moment the toolshaft will'partake of themov'e- `ment-of the pulley-shaft and keeprcvolving so Long as the pressure upon the pedal is continued. The rotary motion thus given to the screw-driver willv necessarily be transmitted to the screw itself, inasmuch as the rotating edge of the driver will'fallinv with the nick of .the screw before one revolution shall have been completed.. In this way the screw is driven home with the rapidity with which the pulley itself is driven. When the screw is driven hom e, pressure on the pedal is released,

the platform drops, 4and the movement ofthe tool and its holder ceases simultaneously.

1t will be understood that it is within the control ofthe voperatorto check or slacken the speed or power of the screw-driver by simply exerting more or less pressure upon the pedal, as before described.

Having now fully described our invention, we claimf j 1. The production of an organized machine -orappa-ratus or tool -for driving wood screws,

arranged and combined to operate as herein described when-actuated by a prime mover.

42f. y.The combination, with a suitable frame holding in fixed bearin gs the screw-driver,.and

with a platform to support the work to be operated upon, of a mechanism for elevating the platform vte the driver, together with a4 self- Acentering screwhead cap for holding the driver e'oncentrically with the screw, substantially in the manner and for the' purposes herein described.

3. The method of operating the screwdriver by a friction device, substantially as described, the same consisting of a pair of friction pads orclutches upon the tooldwlder and its surrounding pulley-shaft, respectively arranged for action in conjunction with the movable platform, as described, so that by elevating.

the platform to 'the screw-driver the pads or clutches will be brought into frctional contact, whereby rotary motion may be imparted to the tool or stopped and its speed checked i t pleasure, I

In testimony whereof we have signed our names to this specification before' two subscribing witnesses.

ALFRED M. BAILEY. Witnesses:l JOHN O. COUGH.

LYMAN A. MILLS, Enwnvl?. AUGUR.

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