US240575A - Hand ratdhet-drill - Google Patents

Description

(ModeL) I.- N. 81: R. N. CHERRY. v Hand Ratchet Drill. No. 240,575. Patented April 26,1881.

Invenfmw:

715152 emms':

' Ma t d! vrvef UNITED STATES [PATENT O FICE.-

ISAAC N. CHERRY AND ROBERT N. CHERRY, OF JERSEY CITY,NEW JERSEY.

HAND RATC HET-D RILL.

SPECIFICATION forming part of Letters Patent No. 240,575, dated April 26,1881.

Application filed August 14, 1880. (ModeL) To an whom it may concern:

Be it known that we, ISAAC N. CHERRY and ROBERT N. CHERRY, of Jersey City, in the county of Hudson and State of New Jersey, have jointly invented a Self-Feeding Ratchet Hand-Drill, of which the following is a specification, reference being had to the accompanyingdrawings, forming part of the same, in which-+- Figure 1 is a longitudinal central section of a drill-stock containing our invention. Fig.2 is an external side view of the same. Fig. 3 is a cross-section on line 00 90, Fig. 1; and Figs. 4 to S, inclusive, are detached views of several detached parts, to be particularly described.

Our invention relates to that class of handdrills in which rotary motion is given to the drill stock by. a reciprocating handle that swings loosely on the drillstock, and that communicates motion to the stock by means of aratchet on the stock and a pawl connected with the handle; and, more particularly, to the combination,with the stock andhandle, of the described attachments,whereby the movement of the handle ismade to automatically accomplish a feed-movement of the drill, thus rendering the instrument self-feedin g.

A is the drill-stock, on which are formed or made fast two ratchet-Wheels, a b, the ratchetteeth on each being reversed from those of the other.

B is the handle, arranged to swing loosely pawls are pivoted at e and e in plates 0 and d, and are pressed into engagement and held out of engagement with the ratchet-wheels by the springs ff These springs may be made of a single piece of metal doubled round the abutment g, and between it and the abutment g, the free ends f and f acting against the pawls e 0', what is therefore substantially a single spring being made to perform the functions of two springs. C is the feed-screw that works in afemale screw in the upperend of the drill-stock.

The instrument, as far as described, will be readily'recognized as the ordinary hand ratchet-drill. With this we combine our automatic feed-works,which we will now proceed to describe:

Upon the drill-stock, above the handle, we place an eccentric double sleeve, h h, (this is made double for a purpose to be presently described,) the two parts together constituting, in fact, one sleeve, which is fitted to revolve loosely upon the stock, and is retained in place by a collar, t, (represented detachcdfrom the stock in Fig. 6,) which is secured upon the upper end of thestock by screws. Upon this eccentric-sleeve we place another sleeve, .h which sets down over it and rests upon a shoulder formed on it, as shown in'f Fig. 1. It is fitted loosely upon the eccentric-sleeve, so that the eccentric may revolve within it, and they are secured together by screws. one of which is seen in Fig. 1, (marked 3,) and the heads of two of them are seen in Fig.2, (also marked j.) A groove is cut in the external surface of the eccentric, as seen in Fig. 1, into which the inner ends of the said screws enter loosely, so as to leave the eccentric free to revolve in the sleeve h while they prevent them from being separated. Alittle distance below the upper end of eccentric. In this annular projection is anotch,

l, as seen in Fig. 8, into which'a lug,"m, r0- jects from'thc upper face of the collar 6; This lug, as is evident, so connects the sleeve 71. with the stock A that it must revolve with it.

D is a ratchet-wheel having a hub,'as shown in Fig. 1, through which passes the screw C,

the central opening through which beingjust large enough to permit the said screwto pass loosely through it. On the inner face of the hub is a feather, which works loosely in a lonthe sleeve 71?, on its interior wall, is an annular gitudinal groove in the screw 0, so that the screw must be turned by the turning of the said ratchet-wheel. This ratchet-wheel rests upon the upper face of the annular projection k, andthe lower end of its hub projects into the central opening of this projection, the hub being smaller than the opening, so as to permit the shifting of the sleeve h from side to side.

Into the upper end of the sleeve h is fitted a disk, E, having a large central opening, with an upward-projectin g neck or flange, n, around said opening. This disk, between which and the annular projection is is placed the ratchetwheel D, is secured to the sleeve h by screws passing down into the said annular projection It. It carries two pawls, 0 and 0, that are pivoted in holes in the disk on opposite sides, near its perimeter, and are arranged to engage, one on each side, with the teeth of the ratchetwheel D, and are pressed into engagement with said wheel by the springs 10 and p, as seen in Fig. 4. From the upper face of each of these pawls, between its pivot and the opposite end, a small stud, a" and r, as shown in Fig. 1, projects up through a slotted hole in the disk E, for a purpose to be presently described.

F is a cap having a central opening, which fits down snugly around the upward projection at, and rests upon the upper end of the sleeve k to which it is secured by screws 88. On the under face of this cap are formed two recesses, q and q, as shown in Fig. 5, that are so shaped as to act as cams upon the studs 1" and r. The screws 8 s, which hold this cap upon the sleeve, pass through slotted holes in the cap and bottom in the sleeve, so as to leave the cap free to be rotated or shifted to the right and left on its seat to the extent of the slotted holes. The studs 1 and r are acted .upon by the inner walls of the recesses q and q to take the pawls o and 0 out of engagement with the ratchet-wheel D when the cap is shifted in one direction, and to permit them to engage with said ratchet-wheel when shifted in the opposite direction, thus putting on or will give a little easy friction between the cap and its seat,thus holding it still thereon, while at the same time it is free to be rotated or shifted.

Now, it is. evident that when the eccentric sleeve, heretofore described, is held at rest or prevented from revolving while a rotary motion is given to the stock, and with it to the sleeve h, the said sleeve It will have communicated to it by the eccentric h a motion simi lar to that of the strap upon an eccentric usually employed to procure from the eccentric a rectilinear motion, which will be equivalent to the reciprocation of the said h from side to side, and that as it thus shifts in one direction one of the pawls, 0, will rotate the ratchetwheel D to the extent of that movement, and that as it moves in the opposite direction the other pawl will give a similar movement of the ratchet-wheel in the same direction, and that thereby a feed-movement will be communicated to the screw 0 at each revolution of the stock, due to the eccentricity of the sleeve heretofore described. This eccentric-sleeveis made double, for the purpose of regulating the rate of the feed. Both of the sleeves, h and h, are eccentric, one, h, being placed within the other, h. When both long diameters of the eccentric coincide the resulting eccentricity will be the greatest, and when the said diameters are opposite each other the resulting eccentricity is least, or nothing at all,

the perimeter of the sleeve it becoming then concentric with the stock. As his then shifted upon it, the eccentricity of the perimeter of h may be increased or decreased at pleasure, and consequently the rate of feed may be thus adjusted. When the two eccentric-sleeves are I set for any given rate of speed they are secured in such adjustment by a set-screw, u.

lndex figures, letters, or lines may be made on the outer face of the sleeves h and h, as seen in Fig. 2, so that the workman may conveniently make such adjustment.

Fig. 7 represents a square bushing, intended to fit into the lower end of the drill-stock to receive a round-shanked drill, a straight flattened notch being cut down into the upper end of the bushing, as shown in said figure, into which the flattened end of the round shank may project, whereby the turning of the drill with the bushing is secured.

In operating this drill the workman simply inserts a rod in a hole, '0, provided to receive it in sleeve h, and holds it, together with sleeve h, at rest while he vibrates the handle back and forth in the usual way.

What we claim as our invention, and desire to secure by-Letters Patent, is

1. The combination, with a hand-ratchetdrill stock, of the feed-works described, consisting of the eccentric-sleeve, the sleeve h carrying the disk E, with its pawls 0 and 0, the ratchet-wheel D, and the screw 0, all as and for the purpose described.

2. The combination, with a ratchet-drill stock, of the eccentric-sleeve h, the concentric sleeve m, to which are pivoted the pawls 0 0, one or both, the ratchet-wheel D, with which said pawls engage, and the screw 0, all constructed and arranged to operate as and for the purpose described.

3. The combination, with a ratchet-drill stock, of the eccentric-sleeve h and h, the concentric sleeve h to which are pivoted pawls 0 and 0, one or both, the ratchet-wheel D, with which said pawls engage, andthe screw 0, all constructed and arranged to operate asand for the purpose described.

4. The combination, with a hand-ratchet drill stock, of the screw 0, the ratchet-Wheel D, the eccentric-sleeve described, sleeve 72*,

the disk E, carrying the pawls 0 and 0, springs and the abutments g 9 between the plates 0 10 p and p, and the cap F, having the recesses q and d, all as described, and for the purpose and q, constructedland arranged as described, specified.

so that the shifting of the said cap on its seat ISAAC N. CHERRY. 5 will put on or take off the feed all as descrlbed.

5. The combination, with a hand-ratchet- ROBT' CHERRY drill stock, of the handle B, a suitable ratchet Witnesses: wheel or wheels, the swinging pawls e and'e, ALLEN G. N. VERMILYA,

the sprin gs ff made of a single piece of metal, HENRY EICHLING.

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