US506931A

US506931A - Ratchet-drill brace

Info

Publication number: US506931A
Authority: US
Publication date: 1893-10-17
Anticipated expiration: 1910-10-17

Description

(No Model.)

W. P. NOLAN. RATGHBT DRILL BRAGB.

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UNITED l STATES PATENT OFFICE.

WILLIAM P. NOLAN, OF SAN FRANCISCO, lCALIFORNIA.

RATCHETfDRILL BRACE.

SPECIFICATION forming part of Letters Patent No. 506,931, dated October 17, 1893.

Application filed December l5, 1892. Serial No. 455.323. (No model.)

which the speed of the tool shaft can be conveniently changed from a high rate of speed to a single motion corresponding to the movement of the crank arm or vice versa.

The invention consists of certain parts and details, and combinations of the same, as will be hereinafter described and then pointed out in the claims.

Reference is to be had to the accompanying, drawings forming a part of this specitioatioml in which similar letters of reference indicate corresponding parts in all the figures.

Figure 1 is a side elevation of the improve! Fig. 2 is an enlarged sectional elevament. l tion of part of the improvement. Fig. 3 is a sectional plan view of the same on the line 3--3 of Fig. 2. Fig. 4 is an inverted sectional plan view of the same on the line 4-4 of Fig.

v2; and Fig. 5 is an inverted sectional plan view of the same on the line 5-5 of Fig. 2.

The improved ratchet drill brace is provided with a frame A preferably made U- shaped and formed at its upper end with a handle B and at its lower end with a hollow casing or disk C formed with an internal gear wheel C and a hub C2 for the tool shaft, as hereinafter more fully described.

From the handle B projects a bearing B engaging one end of the crank arm D arranged to turn within the frame A and formed at its lower end with an enlargement D formed with a bearing D2 arranged in alignment with the hub O2 of the disk O. The

bearing D2 is engaged by the hub E of a ratchet wheel E formed at its lower end with a flange E2 carrying a number of gear wheels F having their shafts arranged with their centers in a circle, as plainly shown in Fig. 3, so that the said gear wheels are in mesh with the internal gear wheel C of the casing or disk C. The gear wheels F also engage a central gear wheel G formed with an upwardlyprojecting shaft G loosely engaging the hub E of the ratchet wheel E, as plainly shown in Fig. 2. On the top of this central gear wheel G are arranged ratchet teeth G2 adapt ed to engage corresponding ratchet teeth E3 formed in the hollow ratchet wheel E, as plainly shown in Figs. 2 and 4.

From the under side of the gear wheel G extends centrally, the tool shaft G3 mounted to rotate in the hub O2 projecting from the under side of the casing O, as previously mentioned. On this tool shaft G2 are formed two annular grooves G4 and G5 adapted to be engaged by the forked end H of a slide H mounted to slide on the under side of the casing O, as plainly illustrated in Figs. 2 and 5. The forked end H of the slide passes through an opening in the hub O2, so as to either engage the groove G4 or G5 in the tool shaft G3 to hold the latter in the desired position. When the forked end H of the Vslide H engages the groove G4 then the central gear wheel G is in mesh with the gear wheels F, but when the slide His pulled outward so that its forked end H disengages the groove G4 and the tool shaft G3 is moved upward, then the forked end H engages the annular groove G5, thus holding the tool shaft G3 in an uppermost position. In this case, the gear wheel G slides upward with the tool shaft and consequently moves out of mesh with the gear wheels F and into mesh by its ratchet teeth G2, withl the ratchet teeth Es of the ratchet wheel E.

The slide H is formed with a longitudinally-extending slot H2 through which passes the screw I screwing in the under side of the disk C and in this slot H2 is held a spring J, one end of which is attached on the screw I and the other end presses onto the inner end of the slide, so as to hold the latter in contact with its forked end H with the respective groove G4 or G5. The ratchet wheel E is adapted to be engaged by either of two pawls K or K pivoted on the under side of the enlargement Dof the crank arm D; see Figs. 2V and 4. The pawls K and K are pressed on by a coiled spring K2, so as to hold the free ends of the pawls in engagement with the ex- IOO terior teeth of the ratchet wheel E. In order to throw either of the pawls K or K out of mesh with the ratchet Wheel E, a lever L is provided similar to the one shown and described in the above mentioned patent, so that further description of this part of the mechanism is not deemed necessary.

The tool shaft G3 carries a chuck N of any approved construction. New, it will be seen that when the several parts are in the position illustrated in Fig. 2, and the crank arm D is turned, then a rotary motion is given to the ratchet wheel E by the said crank arm o on account of the connection of the latter by the respective pawl K or K through the ratchet Wheel E. Therotary motion of the latter is transmitted by the gear wheels F rolling o the internal gear Wheel C to the cent-ral gear wheel G, so that the tool shaft G3 is rotated at a very high rate of speed. Now, when it is desired to rotate the tool shaft G3 at a low rate of speed correspondingr to that of the motion of the crank arm D, then the operator first withdraws the slide H from the groove G4 and then pushes the tool shaft G3 upward t-o permit the slide I-I to engage the other groove G5. The upward movement of the tool shaft G3 disconnects the gear wheel G from the gear wheels F, as previously mentioned but at the same time moves the ratchet teeth G2 in mesh with the ratchet teeth E3 of the ratchet wheel E. The rotary motion of the latter is now directly transmitted to the tool shaft G3, so that the latter rotates with the motion of the crank arm D.

Having thus fully described my invention, I claim as new and desire to secure by Letters Patentl. In a ratchet drill brace, the combination` Wheel, and a tool shaft mounted to slide and carrying a gear wheel having ratchet teeth adapted to engage correspond ing ratchet teeth formed in the said ratchet Wheel/the said gear wheel being also adapted tov mesh into the said series of gear wheels, substantially as shown and described.

2. In a ratchet drill brace, the combination with a frame formed with a casing having an internal gear wheel, of a crank arm mounted to turn within the said frame, a ratchet Wheel adapted to be locked to the said crank arm, a series of gear Wheels held on the said ratchet Wheel and in mesh with the said internal gear wheel, a tool shaft modnted to slide and carrying a gear wheel having ratchet teeth adapted to engageeorresponding ratchet teeth formed in the said ratchet wheel, the said gear wheel being also adapted to mesh into the said series of gear wheels, and a spring pressed slide held on the said casing and adapted to engage annular grooves in the said tool shaft, substantially as shown and described.

3. In a ratchet drill brace, the combination with a frame formed with acasing having an internal gear wheel, of a crank arm mounted to turn within the said frame,a ratchet wheel adapted to be locked to the said crank arm, aseries of gear wheels held on the said ratchet wheel and in mesh with the said internal gear Wheeha tool shaft mounted to slide and carrying a gear wheel having ratchet teeth adapted to engage corresponding ratchet teeth formed in the said ratchet wheel, the said gear wheel being also adapted to mesh into the said series of gear wheels, and a pawl and lever mechanism for locking the said crank arm to the said ratchet wheel, substantially as shown and described.

WILLIAM P. NOLAN.