US792281A - Portable pneumatic drill. - Google Patents

Description

PATENTED JUNE 13, 1905.

R. A.Y NORLTNG. TABLE PNEUMATN DRT POR 2 SHEETS-SHEET 1.

APPLICATION EILED JULY www No. 792,281.v PATENTBD JUNE 13, 1905. R. A. NORLING.

PORTABLE PNEUMATIG DRILL.

APPLICATION FILED JULY 2o. 1904.

i ==mw llmimunm UNITED STATES Patented June 13, 1905.

PATENT OFFICE.

REINHOLD A. NORLING, OF AURORA, ILLINOIS, ASSIGNOR TO AURORA AUTOMATIC MACHINERY COMPANY, OF AURORA, ILLINOIS, A COR- PORATION CF ILLINOIS.

PORTABLE PNEUMATIO DRILL.

SPECIFICATION forming part of Letters Patent No. 792,281, dated June 13, 1905.

Application filed July 20, 1904. Serial No. 217,371.

To all whom t may concern.-

Be it known that I, REINHOLD A. N ORLING, a citizen of the United States, and a resident of Aurora, in the countyof Kane and State of Illinois, have invented certain new and useful Improvements in Portable Pneumatic Drills and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which form a part of this speciiication.

This invention relates to improvements in portable pneumatic drills or mechanisms of that kind embracing a fluid-pressure engine of portable form applied to operate a drill or like tool.

Improvements constituting my invention are illustrated in the accompanying drawings as applied to a machine having four powercylinders of the kind illustrated in United States Letters Patent N o. 7 62,932, granted to me June 2l, 1904 but my invention is also applicable to other machines of the same general character.

The invention consists in the matters hereinafter set forth, and more particularly pointed out in the appended claims.

In the accompanying drawings, illustrating my invention, Figure 1 is a sectional view of the machine embodying my invention taken through the central axis of the tool actuating or driving spindle and the crankshaft of' the motor. Fig. 2 is a view of the machine when seen from beneath with the bottom wall of the casing removed and the crank-shaft and driving-spindle in section, taken upon line 2 2 of Fig. l. Fig. 3 is a detail view of the crank-shaft and bearing-plate to which my invention more particularly relates, the crank-shaft being shown in transverse section taken on a plane parallel with the bearing-plate and assing through the crank-pin of the crank-s aft, as indicated byline 3 3 of Fig. 1. FigA is a detail sectional view of the crank-shaft, taken upon line 3 3 of Fig. l, but showing the crank-shaft separate from the other parts. Fig. 5 is a face view of the bearing-plate separate from the other parts. Fig. 6 is a side view of said bearingplate. Fig. 7 is a top or plan view of a disk or Washer which carries the counterbalanceweight for the eccentric. Fig. 8 is a top or plan view of the eccentric. Fig. 9 is a secpional view of the same, taken upon line 9 9 of As shown in the said drawings, A indicates the main casing of the machine, which contains an air-supply chamber B and a crankchamber C.

D D indicate the two cylinders constituting the lowermost pair of power-cylinders of the motor, and E, Fig. l, indicates one of the power-cylinders of the upperpair of cylinders. The main casing A is provided at its side adjacent to the crank-shaft chamber B with a handle G, and a handle is formed on the opposite side of the casing'by means of an airsupply pipe F, which communicates with and supplies air to the chamber B.

H indicates the crank-shaft, Which extends through the crank-chamber C, and d e, Fig. l, indicate connecting-rods, Which are attached vto the piston in the cylinders D and E and engage the cranks of said crank-shaft I-I. Said crank-shaft engages at its upper end a bearing I, supported in the top wall A2 of the casing A at the top of the crank-chainber and at its lower end engages a bearing J, which is supported in a cap or auxiliary casing A, which is secured to what may be called the lower face of the main casing A.

K indicates the main driving-spindle ofthe machine, through which motion is transmitted to the rotative tool or other part to be driven. Said spindle extends through the bottom wall of the auxiliary casing A', having a bearing L therein, and at its upper end engages a bearing M, located Within the casing. Said bearing Mis supported by a Wall or diaphragm A3, which forms the bottom of the air-supply chamber B. Mounted in the upper part of the casing in line with the drivingspindle K is a feed-screw N, which engages and passes through a sleeve N', secured in the top wall A2 of the casing A and provided at its upper end with handles n n, by which it may be turned.

The driving-spindleK is actuated from' the crank-shaft H by means of a pinion H on said crank-shaft, which intermeshes with a spur-gear K on the said spindle. The pinion. H is shown as formed by gear-teeth cut in the crank-shaft H, and said pinion and the gear-wheel K are located below the bottom wall A3 of the main casing A and within the auxiliary casing A, which latter covers said arts aswell as the devices bywhich the valves for controlling the passage of pressure fluid to and from the cylinders are actuated from the crank-shaft, said devices being located within the said casing A between said pinion H and gear-wheel K and the adjacent lower wall A3 of the casing A.

O O indicate rock-shafts through which motion is given to the oscillating cylinder or plug-valves of the engine. Said rock-shafts are supported or have bearing in the caps O O, which close the ends of the valve-chambers. Attached to the rock-shafts O O are crank-arms O2 O2, with which are connected the ends of eccentric-rods P P. The straps p p of said eccentric-rods are engagedA with a double eccentric Q, which surrounds the crank-shaft H above the pinion H and is driven from said crank-shaft.

My present invention relates more particularly to means for affording an intermediate or auxiliary bearing for the crank-shaft H and for supporting and driving the eccentric Q, andA these 'features are made as follows:

R indicates a bearing-plate which is held or clamped at its margins between the parts A A of the casing and is provided with an integral bearing-sleeve R, which is arranged concentrically with and surrounds the shaft H between the pinion H and the cranks of the crank-shaft. Said sleeve R affords abearing both for the said crank-shaft H and the eccentric Q. rlhe sleeve R is rovided with a bushing r, in which the eran -shaft turns, while the eccentric Q lits and turns upon the exterior cylindric surface of the said sleeve.

As apreferable means for securing the plate R in place within the casing the parts or sections A A of the casing are divided on a plane adjacent to the plane of said plate, so that the joint between said parts comes into position to receive the outer margin thereof, and the said parts A A of the casing are shaped to provide at the joint between them a grooveor recess adapted to receive the marginal part of said plate.

In the particular construction illustrated the upper part of the crank-chamber C is cylindric in form, and the lower part of the eX- ternal wall of the casing A, which forms the lower part of the outer wall of the said crankchamber,has the form of asegment of a circle, as clearly seen in Fig. 2. rfhat portion A4 of the lower or cap portion A of the casing into 'massi which the lower end of the crank-shaft eX- tends is of like form and is provided at its upper margin with an outwardly-extending flange a, Fig. 1, which fits against the lower margin of the main port of the crank-chamber wall and is secured thereto by headed bolts a', which pass through said flange a and enter the marginal part of the said crankchamber wall above it. Said lower margin of the main crank-chamber wall is provided with a rabbet or recess adapted to receive the marginal part of the plate R, which in its part which engages said crank-chamber wall is shaped to conform to a circular curve and to correspond with the shape of the said crank-chamber wall, as clearly seen in Fig. 2. The upper margin of the port A* of the cap A of the casing, together with its flange a, is adapted to Vlit against the lower margin of the crank-chamber wall and toy also overlap and fit against the marginal part of the said supporting-plate R. When the parts of the casing are clamped and secured together, therefore, the marginal part of the said plate R will be rigidly held or secured in place by being confined between the meeting margins of the main. part A and cap A of the casing.

As shown in the drawings and as preferably constructed, the bolt-holes for the bolts a will be arranged along the line of contact between the margin of the plate R and the casing-wall, as clearly seen in Fig. 2, so that the said holes extend partially i-nto the margin of said plate. As an additional means of centering or holding rigid in place the plate R, the same will preferably be provided with a depending concentric flangezor rib r, adapted to enter and engage the inner surface of the port At of the cap A, which port A is smaller in size or diameter than the main port of the crank-chamber above it.

N ow referring to the means shown for affording a driving connection between the crank-shaft and the eccentric Q., said eccentric is provided at its upper margin, or its side nearest the adjacent crank-arm 7L of the crank-shaft H, with a driving lug or stud S, Figs. 8 and 9, which engages a radial slot or notch H2, formed in the said crank-arm 7L, whichl latter preferably has the form of a flat plate andis extended laterally to constitute arms h h', between which said slot H2 is formed. T he stud S may be secured in any convenient way to the eccentric; but in the particular construction shown it consists of a 'flat-sided block provided with a cylindric stem s, which enters a hole formed in the eccentric to receive it.

The stud S is not designed to be fitted closely in the slot H2, but 1s loosely engaged therewith in such manner as to have a slight radial movement therein. Such loose connection of the stud S with the crank-arm H is designed to insure the smooth running of the parts in cases where, through wear or IOO IIO

veazsi some other cause, the crank-shaft is not eX- actly concentric with the exterior bearingsurface of the sleeve R, on which the eccentric turns. As a result of the construction described the eccentric will always rotate on its own bearing on the sleeve R uninlluenced by any slight eccentricity of the crank-shaft H which might occur through wear or imperfect fitting of the parts. l

T in the drawings indicates a counterbalance-weight which is attached to the crankarm H to counterbalance the eccentric and insure the smooth running of the parts. As a means of attaching said weight T to the crank-shaft, a plate or disk T is employed which is provided with a central aperture to receive the crank-shaft H and which ts against the under surface of the crank-arm h, between said crank-arm and the eccentric Q. Said disk T is provided with a radial slot T2, which coincides in position with the radial slot II2 of the crankarm h and through which passes the stud S on the eccentric. The counterbalance-weight T is located in the same plane with the arm h and fits against the margin or edge thereof, said counterbalance-weight being secured by means of screws or otherwise to the marginal part of the plate or disk T', which projects outside of or beyond the said arm h, as clearly seen in Figs. l, 3, and 7.

A general advantage obtained by the use of the bearing-plate R, attached to or supported from the casing in the manner described, is that 4such bearing-plate affords a lateral bearing or support for the crank-shaft at a point between the driving-pinion and said cranks, so as to prevent any springing or flexure of the shaft when in operation and to insure the smooth running of the parts. The advantage gained by mounting the eccentric Q on the plate R is that said eccentric is thereby supported on a bearing which is rigidly attached to the casing and will maintain its position notwithstanding any wearing of *he crank-shaft bearing such as would permit lateral shifting of said shaft from its normal position.

I claim as my invention- 1. The combination with a crank-shaft, of a bearing-plate provided with a rigidly-attached bearing-sleeve and a valve-actuating eccentric mounted on said sleeve.

2. The combination with a crank-shaft, of a bearing-plate provided with a rigidly-attached bearing-sleeve, and a valve-actuating eccentric mounted on said sleeve, and looselyconnected interlocking parts on the said eccentric and on the crank-shaft by which said eccentric is driven from the crank-shaft.

3. The combination with a crank-shaft, of a bearing-plate provided with a rigidly-attached bearing-sleeve, a valve-actuating eccentric mounted on said sleeve, and driving connections between the said eccentric and the crank-shaft consisting of a stud on the eccentric and a radial slot formed in one kof the crank-arms of the crank-shaft and adapted to receive said stud on the eccentric.

4. The combination with a crank-shaft, of a bearing-plate rovided with a rigidly-attached bearing-slleeve, driving connections between .the said eccentric and the crankshaft consisting of a stud on the eccentric and a radial slot formed in one of the crankarms of the crank-shaft and adapted to receive said stud on the eccentric, a counterbalance-weight for the crank-shaft, and a disk to which said weight is attached, said disk being located on the crank-shaft adjacent to the eccentric and provided with a slot through which passes the said stud on the eccentric.

In testimony that I claim the foregoing as my invention I aix my signature, in presence of two witnesses, this 13th day of July, A. D. 1904.

REINIIOLD A. NORLING.

Witnesses:

W. H. PEASE, CARRIE MUsoHLER.

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