US1163713A - Drill-rotating means for percussion-hammers. - Google Patents

Description

E; L. UPSON.& H. w. PLIISTEN.

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Patented Dec. 14, 19l5.

UNITED STATES PATENT oEEioE.

EDWIN L. U'PSON,'OIl BROOKLYN, NEW YORK, AND HENRY W. PLEISTEB, 0F WEST- FIELD, NEW JERSEY, ASSIGNOES TO HENRY B. NEWHALL, OF PLAINFIELD, NEW

JERSEY.

Specification of Letters Patent.

Patented Dec. 14, 1915.

Application led April 8, 1918. Serial No. 758,657.

T o all whom it may concern.

Be it known that we, EDWIN L. UPsoN, a citizen of the United States, residing at Brooklyn, in the county of Kings and State of New York, and HENRY W. PLEIsTER, a citizen of the United States, residin at Westfield, in the county of Union and tate of New Jersey, have invented certain new and useful Improvements in Drill-Rotating Means for Percussion-Hammers, of which the following is a speciication. U

Our present invention relates to an improvement in ercussion hammers of .the type disclosed in our pending application, Serial No. 719,735, filed September 11, 1912, and more especially pertains to means for automatically rotating the drill or cutting member between blows in lieu of turning the tool itself by hand, to prevent the drill from cutting continuously in one position. By means of partial or intermittent step by step rotation, and under impact of the hammer, the drill is caused to cut into the stone faster than where the force is applied in one place.

In the accompanying drawing, Figure 1 is a sectional view of our device taken on the line 2-2 of Fig. 2, and Fig. 2, is a section of our device taken on the line 1-1,

Fig; 1.

s in said application we provide a housing 4 with av tubular extension containing a tool-passage 40; a hammer 8 operable therein whose inner end is guided by a link and which contains a cam slot 17; an energystoring spring 7 strained between said hammer and an abutment on the housing; and hammer-retracting and releasing means comprising a sha t 3 revolubly mounted in said housing, a crank 6 (or other powersupply means) connected with said shaft and fixed thereto by a pin 5 (or otherwise) a cam disk 1 formed with a plurality of disk cams 2 adapted to pass through the slot 17 of said hammer, engage and disengage the inner cam wall thereof, retract the hammer and strain and store energy in said spring and release the same, to strike blows upon the drill or cutter 23.

In our present invention the shaft 3 is operably connected with and rotates the drill. To this end we revolubly mount in the tool passage 40 of the housing extension, a tubular tool stock 18 in which the hammer head plays and is guided and having an outer polygonal (square) socket through which the square tool-shank extends, to receive hammer blows, and a lar er inner tubular head 13 by whose shoul er the stock is confined in the tool passage and on whose exterior are formed a plurality of alternating right and left hand thread sections or oppositely inclined helical or stock cams 14 and 14 respectively; fix an eccentric 9 on the shaft 3; and strap thereto an eccentric cam rod 10, whose offset reciprocating end 11 plays in a slot 41 formed in the housing 4 and bears on its inward and outward faces respectively, a driving cam 12 and a pin 16, the former adapted to alternately engage the oppositely inclined helical or stock cams 14 and 14'* and rotate the tool stock and tool; and the latter engaged and guided in a straight line by a guide, 15, formed in the cover plate 42 of said slot 41.

To insure operating engagements between the driving cam 12 and successive helical or stock cams 14, 14", 14, in their order of action, and rotation of the tool, the stock cams are axially stepped so that their anterior ends can pass the driving cam 12 and are angularly so located that the angular distance between the posterior end of one and the anterior end of its successor is less than the angular measurement, referred to the axis of the stock, of the cam faces on said driving cam 12.

When the eccentric rod 10 is moved outwardly, the face 7) of its cam 12 is thrust against the face of a right-hand stock cam 14 and turns the stock and tool, clock-wise, so far that the anterior end of the succeeding left-hand cam 14 is moved across the path of the driving cam 12 and therefore, on its in-stroke, its face n is pulled against the face of said stock cam 14'* and again turns the stock and tool clock-wise and so far that the anterior end of the succeeding right-hand stock cam 14 is moved across said ath; and thus the stock and tool are turned intermittently continuously by the shaft 3.

If the driving cam 12 were cylindrical the adjacent ends of successive stock cams would have to overlap and their angular separation to be negative in order to secure successive operative en agements. By making the cam faces p an n of the driving cam 12 divergent planes substantially parallel with the faces of their respective co-acting stock cams 14 and 14, We are enabled to makeV said angle of separation positive, the stock cams more open and their faces more ascessible so that they can be easily cut as screw-threads.,

To cheapen first cost and maintenance the tool stock 18 is made of three parts, namely, its hammer guiding body integral with the cam-bearing head 13, a ferrule 19 and a tool retaining cup, 27.

The ferrule 19 contains a polygonal socket for the tool shank and is made fast in the stock extension 18 by threads 22 and set screws 20, 21. Said parts are then entered from within the housing into its tool stock passage 40, and a bushing 24, screwed into the outer end thereof, axially confines the 20 tool stock therein by means of the co-action of the shoulder ofthe stock head 13 with the shoulders 26 of the housing and the adjacent ends of the stock body and bushing 24.

Thereafter the tool 23 is inserted in its 25 socket and the cap 27 is screwed on the ferrule 19 and forms therewith a chamber 28 in which the tool collar is confined but with operative clearances. The tool shank extends through the holder 19 into the path of the hammer which cannot strike the tool holder 19 because of clearance, 29, between them.

The hammer 8 being link-guided at its butt and socket-guided at its head. it is necessary that the hammer socket in the tool stock 18 be either inwardly enlarged or made with considerable clearance. to accommodate the hammer motion; either mode can be used; but because the stock is rotated about the angularly fixed hammer, its forms must be symmetrical.

With the exception of the description of the eccentric. the lower tool holding portion for the drill shank` and rotating means, the operation of the tool is substantially as described in the previously mentioned application co-pending herewith.

Having thus described our invention, we claim:

1. In a percussion tool of the class described, a housing` an eccentric-rod guide therein and a tubular-extension thereof containing a tubular passage: a tubular tool stock revolubly mounted in said passage adapted to slidably mount and angular-ly position a tool. and alternately-oppositely inclined substantially helical stock cams on said stock: a hammer adapted to be reciprocated in said tool stock and having adiacent 6 to its butt a cam slot provided with an inner cam wall: means for guiding the butt of said hammer substantially co-axial with said stock: an energy-storing spring strained between said hammer and housing; a shaft revolubly mounted in said housing and having fixed thereto an eccentric and a cam disk and on said disk a plurality of disk cams adapted to traverse the cam slot in said hammer, engage and disengage the inner cam wall thereof and retract and release 1o said hammer; an eccentric rod connected with said eccentric and on said rod a pin adapted to engage said guide in said housing, and a driving'cam adapted to successively engage said oppositely inclined helical stock cams.

2. In a percussion tool of the class described, a substantially cylindrical housing, a radial extension thereof containing a tubular passage, said housing having a slot formed adjacent to and parallel with said passage, and a cover plate covering said slot; a tubular tool stock revolubly mounted in said passage adapted to slidably mount and angularly position a tool and alter- 85 mately-oppositely inclined helical stock cams on said stock: a hammer adapted to be reciprocated in said stock, link-guided at the butt and having adjacent thereto a cam slot provided with an inner wall; an energy-storing spring strained between said hammer and housing; a shaft revolubly mounted in said housing and thereon an eccentric and a cam disk, the latter having a plurality of disk cams. said disk cams adapted to traverse said hammer slot. engage the inner cam wall thereof and retract and release said hammer; an eccentric rod connected with said eccentric and a guide and a driving cam thereon respectively adapted to guide the end of said rod and to successively engage oppositely inclined helical stock cams and intermittently turn said stock.

3. In a percussion tool of the class de scribed, a housing, an extension thereof containing a. tubular passage and an eccentric rcd-guide, a tubular tool-stock revolubly mounted in said passage, a plurality of helical cams on said stock. a hammer slidably mounted in said tool-stock. hammer operating means. a shaft revolubly mounted in said housing, an eccentric fixed to said shaft, an eccentric rod connected to said eccentric, a pin on said rod adapted to engage said eccentric rod-guide. and a driving cam on said eccentric rod adapted to successively engage said helical cams thereby to turn said tool-stock.

4. In a percussion tool of the class described, a housing, an extension thereof containing a tubular passage; a tubular tool stock revolubly mounted therein adapted to slidably mount and angularlv position a tool. and a plurality of oppositely inclined stock cams formed on said stock; a hammer; hammer extruding means connected to said hammer, a driving shaft. hammer retracting means rotatably mounted on said shaft and independent of, but adapted 4to engage, said hammer to retract the same; and a driving 181 1,1as,71a

cam operably connected .with and adapted to be operated by said driving shaft and to coact with successive stock cams aforesaid and turn said stock intermittently through different angles.

5. In a percussion tool of the class described, a housing, an extension thereof containing a tubular passage and an eccentric rodguide, a tubular tool-stock revolubly mounted in said passage, a plurality of helical cams on said stock, a hammer slidably mounted in said tool-stock, means for advancing said hammer, a Shaft revolubly mounted in said housing, an eccentric fixed to said shaft, .retracting means fixed to said shaft for retracting said hammer, an eccentric rod connected to said eccentric, a pin on said rod adapted to engage said eccentric rod-guide, and a driving cam on said eccentric rod adapted to successively engage said helical cams thereby to turn said tool-stock.

6. In a percussion tool of the class described, a housing, an extension thereof containing a tubular passage, a tool-stock revolubly mounted in said passage, a plurality of helical cams on said stock, a hammer slidably mounted in said tool-stock, a driving shaft, hammer retracting means fixed to said driving shaft and independent of, but adapted to engage, said hammer to retract the same, an eccentric fixed to said shaft, an eccentric rod connected to said eccentric, and a driving cam on said eccentric rod adapted to successively engage said helical cams thereby to turn said tool-stock.

7. In a hammer of the class described, a housing, an extension thereof containing a tubular shouldered passage, and a bushing in the outer end of said passage; a tubular tool stock revolubly mounted in said passage, axially confined therein by the engagement of shoulders formed on said stock with shoulders formed respectively on said stock and bushing, containing a tubular hammer socket and a polygonal tool socket and formed on said stock a plurality of oppositely inclined stock cams; a cap detachably connected with the outer end of said stoc and forming therewith a chamber adapted for a tool-shank collar and to loosely retain a tool; a hammer having its head operable in the hammer socket of said stock and in its butt a cam slot provided with an inner wall; an energy storing spring strained between said hammer and housing; operating means to operate said hammer and a driving cam operably connected with said operating means and adapted to successively engage oppositely inclined stock cams aforesaid and turn said stock.

EDWIN L. UPSON. HENRY W. PLEISTER.

Witnesses:

FRED. J. DOLE, JOHN MORRIS.

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