US728314A - Hand rock-drill. - Google Patents

Description

No. 723,314." ,PATEVNTED MAY 19,j1903.

f. Y. SMITH. HAND ROOK- DRILL.

APPLIOATIQN FILED OUT. 31, 1902.

no MODEL. 7 2 snu -sum z.

v UNITED STATES Patented May 19, 1903.

, PATENT OFFICE.

VALERIUS Y. SMITH, GLOBE, ARIZONA TERRITORY.

HAND 'ROCKQDRILL.

srncrrrcarxon forming part of Letters Patent to. 728,314, dated May 19, 1903. Application filed October 31,1902. Serial No. 129,617. (We model.)

T0 at whom. it may concern:

Be it known that I, VALERIUS Y. SMITH, a citizen of the United States, and a resident of Globe, in the county of Gila and Territory of Arizona, have invented certain new and useful Improvements in Hand Rock-Drills; and I do hereby declare that the following is a full, clear, and exact description thereof.

My invention has for its object to provide simple economical hand-power rock-drills similar in general construction and operation to the one set forth in my Patent No. 702,499, of June 17, 1902; and it consists in certain peculiarities of construction and combination of parts hereinafter particularly set forth with reference to the accompanying drawings and subsequently claimed.

Figure 1 of the drawings represents a sec.- tional view of my improved drill and is indicated by line 1 1 in Fig. 2; Fig. 2, aside elevation of the drill, partly in section, as indicated by line 2 2 in Fig. 4; and Figs. 3, 4, and

5, transverse sectional views, respectively, in

rlicated by lines 3 3, 4 4:, and 5 5 in Fig. 2. Fig. 6 represents an elevation of the clutch side of an arm that constitutes a detail of the drill mechanism.

Referring by letter to the drawings, A indicates the drill-carriage, attachable to any suitable support, and B the slotted cylindrical casing that is guided on the carriage. A nut-f lug b of the carriage is engaged by a screw 0, for which the carriage is provided with a bear: ing-arm A, and a hand-crank c is fast on one end of the screw. By manipulation of'the screw the casing B is adjusted on carriage A longitudinally of the same.

containing said ratchet-wheel being remov-j able and held in place by screws, as shown in Fig. 1. V Spring-controlled pawls g are arranged in the box aforesaid to engage the ratchet-wheel, and one or the other of these The drill'shank D is guided in the casing B and provided atpawls is always active to hold said ratchetwheel against rotation in one direction. Arranged in casing B, between a partition 72. of same and a collar '5 of shank D, to surround this shank is the power-spring G of the drill, and alsosurrounding the shank between its collar and forward head of said casing is the buffer-spring H of said drill.

Fulcrumed at its center on a lateral studj of casing B is the double lever I of the drill, arid links J J connect the ends. of this lever withslide-bars K K, for which the casing B is provided with guides. Set in an apertured portion of each slide-bar is a pair of gibs is and an intermediate tooth L, that is provided with a lengthwise slot engaged by a 'pin m, set in said bar, the inner end of the tooth being inclined to at times face an incline on the casing above specified. Fast on each slidebar is one end of a leaf-spring M, and the other or free end of this spring impinges againstthe tooth that is carried by said bar, the power of said spring being against outward movement of said tooth. Each tooth and the gibs between which its slides are hardened steel, and when worn new onesmay be substituted. Each of the spring-controlled teeth aforesaid is provided at its outer end with;a transverse pin n, on which antifriction-rollers p are arranged, and arranged in the path of these rollers are partly-inclined prongs q of a fork, the tangrof which is adjustably held in a rear head extension of the casing B by means of a set-screw s, it being understood that said tooth has play between :the fork-prongs.

In one piece with double lover I or otherwise rigid with the same, preferably at an angle thereto, is a plate I,that extends equally in opposite directions from the fulcrum ofsaid lever. The ends of the plate are apertured and provided with teeth radiating from the apertures. Put into clutch withleither end of the plate is the apertured and radiallytoothed end of an arm N, to which the handlever O of the drill'is rivetedor otherwise rigidly secured, the clutch union of the arm with said plate at any angle being maintained by means of a bolt and not, as best shown in Fig. 5, and said arm is made fast to one end or the other of the aforesaid plate as may suit the convenience of the drill operator or the circumstances under which the drilling is done.

In practice the lever O is actuated to reciprocate the slide-bars K K, and as each bar moves toward the rear from full forward throw the tooth L therewith moving oif the abutting incline of the casing B is forced inward by the opposing spring M to come against the forward side of the head (Z of drill-shank D, and thereby move said drillshank rearward, this movement resulting in compression of spring G until such time as the antifriction rollers 19, with said tooth, ride up on the partly-inclined fork-prongs in their path. Thetooth is now retracted from working contact with head cl of the drillshank, and by expansion of spring G said shank is shot forward with a rotary motion that results from the spiral-flange-and-groove engagement of bushing E and ratchet-wheel spindle e, arranged as above specified. lVhen one of the slide-bars is moving to the rear, the other has motion in the opposite direction, and the tooth L therewith is moved outward clear of the head of the drill-shank by riding on the incline of the casing.

The forks above specified are adjusted to regulate the time of'trip of the teeth L from working contact with head dof the drill-shank, and the compression of spring G is consequently more or less, as greater or less power is required to drive said shank.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. The combination of the slotted casing, the drill-shank having a rear head within the slotted portion of said casing, the slide-bars, a spring-controlled sliding tooth carried by each slide-bar and which for a time in the rearward movement of same abuts the drillshank head, whereby said shank is retracted against spring resistancein the casing, means by which the tooth is retracted to clear said head, and lever-and-link mechanism for actuating said slide-bars.

' 2. The combination of the slotted casing, the drill-shank having a rear head within the slotted portion of said casing, the slide-bars, a spring-controlled sliding tooth carried by each slide-bar and which for a time in the rearward movement of same abuts the drillshank head, whereby said shank is retracted against spring resistance in the casing, antifriction-rollers carried by the teeth laterally of same, inclines arranged in the rear paths of the rollers, and lever-and-link mechanism for actuating said slide-bars.

3. The combination of the slotted casing, the drill-shank having a rear head within the slotted portion of said casing,'the slide-bars, a spring-controlled sliding tooth carried by each slide-bar and which for a time in the rearward movement of same abuts the drillshank head, whereby said shank is retracted against spring resistance in the casing, antifrictionrollers carried by the teeth laterally of the same, adjustable forks having partlyinclined prongs in the paths of the rollers, and lever-and-link mechanism for actuating said slide-bars.

4. The combination of the slotted casing, the apertured slide-bars, a pair of gibs and an interposed spring-controlled tooth in the aperture of each bar, a pin crossing said aperture and engaging a slot in the tooth lengthwise of same, the inner end of said tooth being inclined to at times face upon an incline of the casing, the drill-shank having a rear head within the slotted portion of said casing in the paths of the slide-bar teeth, means for clearing said teeth from the drill-shan k head when said shank is retracted against spring resistance in the casing, and lever-and-link mechanism for actuating said slide-bars.

5. The combination of the centrallyfulcrumed lever, a plate rigid with the lever and extending in opposite directions from the fulcrum of same, said plate being provided with end apertures and teeth radiating from said apertures; an arm having an apertured and radially-toothed end for clutch engagement with either end of the plate, and means by which the, clutch union of the arm with said plate is maintained.

In testimony that I claim the foregoing I have hereunto set my hand, at Milwaukee, in the county of Milwaukee and State of Wisconsin, in the presence of two witnesses.

VALERIUS Y. SMITH.

Witnesses:

N. E. OLIPHANT, B. C. ROLOFF.

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