US1713310A - Rotary motor tool - Google Patents

Description

y .14, 1929; J. .1. N. VAN HAMERSVELD 1,713,310

ROTARY MOTOR TOOL Filed Sept. 30, 1926 4 Sheets-Sheet l gwimdoz y 1929' J. J. N. VAN HAMERSVELD ROTARY MOTOR TOOL 4 Sheets-Sheet 3 Filed Sept. 30, 1926 I AN/Ai/ x n MN y 1929. J. J. N. VAN IHAMERSVELD 13,310

ROTARY MOTOR TOOL Filed Sept. 30, 1926 {Sheets-Sheet 4' Patented May '14, 1929.

UNITED STATES PATENT OFFICE.

JOHN J. N. IVAN HAMERSVELD, OF CLEVELAND HEIGHTS, OHIO, A SSIGNOR, BY MESNE v ASSIGNMENTS, TO'THE BOTOB AIR TOOL COMPANY, OF CLEVELAND,' OHIO, A. COR- ROTARY Moron TOOL.

Application filed September 30, 1926. Serial 110.138,?24.

\Thi'siinvention relates to a rotary motor tool and has for one of its objects to provlde 'an improved reversible tool with a gear reduction particularly adapted for drilling,

ways soas to avoidnianufacturing complications, minimum length of passageways from the point of entrance to the point of exhaust 20- of the air, as well as ease of operation of the -valve and at the same time admit of the use in another of ,its working positions, corre- 7 of reduction gearing and a housing enclosing the same which adds little to the size of the structure as a whole. Itisa further object also to arran e the parts just enumerated so as to admito the use of a standardized motor adaptable for other types of tools not requiring thereversible and geared reduction features, the added features of reversibility and gear reduction being accomplished with very few changes in the standardized 'motor, and

mainly bytheintroduction or application of" certain parts in the nature of an attachment tothe standardised motor; I

The above and other objects are attained by my invention which may be here brieflysummarized as consisting in certain novel details of construction and combinations and arragements of parts which will be described in the specification and set L'IOIthr in the appended cla'ims.

In the accompanying sheets of drawings il-' lustrating'an embodiment which operates effectively, Fig. 1 is a top plan view of the rotary 'motor too1.-

Fig. 2 is an end view lookingtoward the .left of Fig.1; Fig. 3-i's a side elevation; Fig. {i is a longitudinal sectional view on an enlarged scale substantially along the line 4--4 of 1;

Fig. -5 is aftransverse sectional view substantially along the line 5--5 of Fig. 4;

Fig. 6 i's a fragmentary sectional view sub-1 in an efiicient manner the reduction gearing, valve, handles and inlet and exhaust passage? stantially along the line 6-6 of Fig. 5 omit- 55 ting the cover plate for the valve operating mechanism; I

Fig. 7 is an elevation of the cover plate omitted from Fig. 6;

Fig. 8 is a plan view showing a portion of'60 Fig. 1 with the top plate of the motor removed and with a portion of the gear housin%and the valve in section;

ig. 9 is a sectional view substantially along the line 9 -9 of Fig. 8;

'Fig. 10 is a fragmentary sectional view substantially along the line 10-10 of Fig. 8;

.Fig. 11 is a perspective View of the valve; Fig. 12 is a transverse sectional View of the valve and its associated sleeve substantially along the line 1212 of Fig. 8 showing the valve in one of its working. positions for rotation-of. the tool spindle in one direction;

Fig. '13 is a similar view with the-'valve sponding to the rotation of the tool spindle in the opposite direction;

\ seen that the rotary motor tool herein illustrated includes a motor proper 20, at the front of .which is a gear housing 2l With'laterally projecting cross bar handles 22 and 23 and with a forward extension 24 for supporting a tool holding member here. illustrated as a taper shank socket 25. At the rear end of the motor is a carryin handle 26. V

'The'motor itsel is substantially the same as the motor illustrated in and constituting. the subjectv matter of the prior application filed in the names'of Van Hamersveld and Cook, Serial No. 70,642, (Patent No. 1,653,

748, granted December27, 1927), the motor therein illustrated being designed particularly for use with tools not requiring reversibility,'as'for example, when used'for grinding and bufling purposes; or the like; As the motor is quite similar to that referred to in the prior application, a brief description of the same will here sufiice. It includes a onepiece body 27 with a straight 'cylinderbore extending from end to end therethrough, which bore receives two pistons 28 eccentrica-l- 1y mounted on a motor spin'dle 29 which, in

this instance, is supported by a ball bearing 30 arranged between the pistons and by an outer ball bearing 31 supported by a front bracket 32.

The inner bearing 30 is mounted in a bearing housing 33 fixed in position by a screw 34 extending through the central wall 35 of the motor body midway of the ends thereof or centrally with respect to the pistons which are arranged on opposite sides of the inner bearing 30 and its housing 33.

The cylinder body has an extension on one side and through this extension are drilled from end to end pasageway's 36 and, 37' for the motive fluid, which is generally compressed air, see Fig. 9. Between the passageways 36 and 37 two radially disposed guideways are formed between the outer face of the extension and the cylinder bore, and in these passageways are arranged two radially movable blades 38. The passageway 36 is intersected by a series of passageways 39 drilled from the outer face of the extension to the cylinder der plates 42 which are arranged between the motor body and the front bracket 32 and rear handle 26 respectively, these cylinder plates closing the ends of the radial slots receiving the radially movable blades 38.

Coming now to the structure more directly involving the present improvements, it will be seen that the gear housing 21 already referred to is composed of two portions, including'a main front portion and a rear portion formed by the, bracket 32. These two parts of the hou ing, the motor body 27, the-cylinder plate 42 and the carrying handle 26 are secured together by axially disposed bolts 43, 44 and 45. The bolts 43, of which there are two, arranged near the top of the motor, ex-.

tend entirely through the device, including the carrying handle at the rear and the two parts of the housing 21 at the front. The

olts 44, of which there are two, located below the bolts 43, extend from the rear through the bracket 32 only, for a purpose which will appear presently, and the bolts 45 extend through the lower portion of the two parts forming the housing, as illustrated most clearly in Fig. 3.

The reduction gearing consists of two pairs of meshing gears arranged in two planes, one forwardly of the other, the rear pair including a pinion 46 which is preferably formed direct on the motor spindle 29, and a relatively large gear 47 meshing therewith and arranged on a countershaft 48 supported in ball bearings 49 and 50 mounted respectively in the front and rear portions of the housing 21. The other pair of gears includes a pinion 51, also on the countershaft 48, meshing with a gear 52 which in this instance is larger than the gear 51, and is secured to the rear end of the tool spindle 53 to which the taper shank socket 25 is attached. The spindle 53 extends through a forward sleeve-like extension 54 of the front or main member of the housing 21, and it is supported by two ball bearings-55 and 56 mounted in this extension, the bearing 55 being adjacent the gear 52 and the bearing 56 being adjacent the forward end of the extension 54, which is closed by a suitable packing ring and nut 57.

Referring particularly to Fig. 5, it will be seen that the main portion of the gear housing 21 has integral lateral extensions forming the cross bar handles 22 and 23 and that it has also at the top an integral extension 58 which forms a housing for a valve 59 which is a small cylinder valve axially rotatable and disposed transversely of the tool above the reduction gearing. The valve 59 is adapted to rotate in a sleeve 60 fixed in a cylindrical opening bored into the extension 58, one end of this opening being closed by a plug 61. The valve at the opposite end is provided with an extension 62 carrying at its outer end a gear segment 63 normally closed by a cover plate 64 and engaging teeth formed on a valve controlling sleeve 65 rotatably supported on the cross bar handle 22. This sleeve is held from end wise movement'on the cros bar handle 22 by a nut 66 which is screwed onto the end thereof.

By reference to Figs. 5 and 6, it will be observed that the inner end of the valve controlling sleeve .65 is provided opposite the toothed portion engaging the gear segment 63 with notches 67 which are adapted to be engaged-by a spring-pressed detent 67, the notches corresponding to the two working and neutral positions of the valve so that the detent will hold ,the valve in, these main positions without liability of being moved by vibration.

The air or other motive fluid is supplied through the cross bar handle 23, the latter being provided with a passageway 68 which extends from the outer end longitudinally of this cross bar handle into the body portion of the gear housing, and then curving upwardly, the innerbnd registering with a port 69 in the fixed sleeve 60 which receives the valve 59. The cross bar handle 23 is preferably provided alsowith a longitudinally ex tending lubricating chamber 70, the lubricant from which is adapted to pass into the stream of air flowing through the passageway .68 at a rate which can be controlled by a needle valve 71.

The air, after passing from the valve through the motor and back to the valve in'a manner vto be explained, leaves the tool through a fairly large passageway 72 which extends through the .cross bar handle 22 after passing through a screen 73 (provided 'to keep out dirt) which is held in position agalnst the end of the cross bar handle by the nut 66, as illustrated in Fig. It will are close to each'other, being be observed that the passageway 72 is provided with a series of ribs 74 which are spaced apart axially of the passageway and project .in opposite directions in overlapping rela tion so as to provide a bafiiing elfect to re duce the noise of the exhaust.

The inner end of the exhaust passageway 72 extends into the main portion of the gear housing 21 where it curves upwardly and is in registration with a port 75 in the sleeve 60 receiving the valve 59. The inner ends of the inlet passageway 68 through crossbar handle 23-and of the exhaust assageway 72 extending through the crossv ar handle, 22

ever, by a web 76 seen in Fig. 5.

A point to be noted is that the innerportions of-the inlet and exhaust passageways 68 and 72 are in the space between the two pairs of reduction gears immediately beneath the valve whose axis also lies between these two pairs of gears.

In'the end of'the valve 59 adjacent the nut 61 is a chamber 77, and in the wall of this chamber is a port 78 which at all times regisadapted to function as an inlet port, in ad- 'munication with the dition to the port already referredto, this last mentioned port being at all times in compassageway of the yalve. j

By reference to Fig. 4, it will be observed that the ports 81 and 82 in the sleeve 60 register with two passageways 84 and 85 in the adjacent portion of the wall of the housing 21 and that these passageways are in alignment with passageways 86 and 87 formed in the bracket portion 32 of the housing 21. These two passageways 86 and 87 are extended laterally, asshown in Fig. 10, and extend to openings 88 and 89 which register with the passageways36 and 37 extending through the cylinder body, registering openings being formed also, of course, through the intermediate cylinder plate 42. There will be presently explained the course of the motive fluid through the valve and motor for each direction of operation.

separated, how- The chamber 77 of the'valve is additionally rovided with two ports 90, one of which is adapted to register with a port 91 inthe valve sleeve 60 when the valve is in eitheg of its two working positions. This port 91 is connected by a passageway 92 through the bracket portion 32 of the gear housing to a passageway 93 which extends part waythrough the-cylinder body and is connected by two ports 94 to theupper portions of the slots receiving the reciprocating blades 38' so that whenever the motor is in operation the pressure of the motive fluid will be behind these blades so as to'cushion the outward strokes of the blades and to hold them down into engagement with the rotors, this occurring, of course, witheither direction of rotation of the rotors, (see Figs. 8, 9 and 10). When the valve is in the position indicated in Figs. 4 and 8, it is in neutral position in which event no air is supplied to the motor, but when it is turned to the position shown in Fig. 13, air passes from the chamber 80 I and the slot 79 of the valve, through the port 82, and by way of the passageways 85, 87, 89, 37 and 40 to the cylinders, thus rotating the cylinders in one direction. At the same time exhaust occurs from the cylinders by way of the passageways 39, 36, 88 and 84 to'the port 81 of sleeve 60, and by passageway 80 of the valve to the exhaust port 75 of the valve sleeve 60, and into the exhaust passageway 72 in cross bar handle 22, from which the air quietly escapes.

When the valve is turned to the position shown in Fig. 12, the air passes through the motor in the reverse direction, being supplled to the passageway 81 extending through the cylinder body and exhausted from the passageway 89 and being conducted through the valve to the outlet passageway 72, as before.

By turning the sleeve 65 slightly, motion is transmitted to the valve by reason ofthe geared connection of these parts so that 1t is convenient for the operator to posltlon the valve either in neutral position or in either of its running positions. As previously stated, regardless of the diIBCtiOIl in which the motor is run, air on the reciprocating lades 38, the air supply to the outer ends of the slots containing the blades being shut off when the valve is in neutral position, as will be seen by reference to Fig. 15, so as to prevent leakage of air when the motor'is not in use.

With the construction which I have provided, it is only necessary to remove the nuts from the ends of the bolts 43 and 45 to permit removal of the body portion of the gear housing from that portion thereof formed by the bracket 32, and inasmuch as there is ample space between the pinion or gear. 51 and the lower part of the gear housing, as shown in Fig. 4, it will be obvious that the ratios of gears'51 and 52 can be changed to vary the pressure is exerted down i I speed ratios between the motor spindle and the tool spindle.

By reference particularly to Figs. 1,2 and,

3, it will be notedthatthe reduction gearing and gear housing, even though the valve is incorporated .iIl it, add very little to the size of the tool, rendering it very compact.

high degree of compactness is due in largev measureto theadvantageous arrangement of the valve and -thevarious air passa es extending to and from the valve through the cross bar handles and especially asgthe otherwise unoccupied space between the two pairs of gears is made use of by extending portions of the passageways into this space to an extent well illustrated in Fig. 5, thus making it possible to lower the vvalve considerably and .to condense the structure generally as regards a construction wherein these passageways are outside of the space occupied-by the gearing.

Not only does this arrangement, i. e., the ar-' rangement wherein these air passageways are extended'for a distance between the two pairs of gears, add materially to the feature of compaetness, but the lowering of the valve permit:

ted by this arrangement brings the passage" ways to the gear housing, including the bracket 32, substantially inlinewith themainpassageways extending longitudinally through the cylinderv body, thereby permitting the air to pass to and from the cylinders in the most direct fashion. This, ofcourse, adds tothe efliciency 'of-the motor by reducing loss in power by the 'friction of .the air in passing through the motor.

It might be noted in conclusion that by diing the speedra-tios or for repair purposes,

but this construction allows the tool to be first assembledinto two unit assembliesconsis'ting in effect of the parts on opposite sides of the partingline shown inFig. 4 where the two" partsof the gear housing are united. The countershaft with the-gears47 and 51 may be made a part of either of these unit assemblies.

\Vhile I have shown the preferred construction and one which operates at high efliciency, I do not desire to be confined to the precise details shown but aim in my claims to cover all modifications which do not involve a departure from the spirit and scope of the invention. 1

Having thus described my invention, I claim: I

'1. In a rotary motor tool, a fluid pressure motor comprising a housingand a rotor including a motor spindle, a tool spindle, reduction gearing between said spindles, a housing for said gearing secured to the endot the This ing and motor housing having passageways for the motive fluid.

motor housing, and cross bar handles extenda ing from opposite sides of the gear" housing.

2. In a rotary motor tool, a fluid pressure motor comprising a housing and a rotor including a motor spindle, a tool s indle, reduction gearing between said spi'nd es, a housing enclosing said gearing and attached to the end of the motor housing, the gear housconnecting 3. In a rotary motor tool, a fluid pressure motor comprising a housing and a rotor including a motor spindle a tool spindle, reduction gearing connecting them, a housing enclosing said. gearing and attached to the end of'the motor housing, the gear housing and motor housing having communicating passageways for the motive fluid, and a valve carried by the gear housing and controlling the flow of motive, fluid through said passageway. 4

4; In a rotary motor tool,'a fluid pressure motor comprising 'a housing and a rotor in-. cluding a motor spindle, a tool spindle, gearing connecting the spindles, a housing enclosving the gearing and attached to the endof the motor housing, passageways for both the sup ply and exhaust of motive fluid in the motor housing, similar passageways .in the gear housing and communicating with the first named passageways, and a reversing valve carriedb the, gear housing and controlling the supply and exhaust of motive fluid and the direction of rotation. p

5. In arotary motor tool, a fluid pressure motor comprising a' housing and a rotor'ineluding a motor spindle, a tool-spindle, gear-- ingconnecting them, a gear housing secured to the end of the motor'housing, cross bar handles secured to the gear housing, passageways for the motive fluid formed in the motor housing and gear housing in communicative relation, and a valve carried by the gear housing and controlling the through the passageways.

6. In a rotary motor tool, a fluid pressure motor comprising a housing and a rotor including a motor spindle, a tool spindle, gearing connecting the spindles, ahousing enclosing the gearing and attached to the endof the motor housing, a cross bar handle secured to the gearing housing and having a fluid passageway extending therethrough, a valve carried by the gear housing and communicating with the passageway of said handle and, communicating passageways formed in the gear housing and in the motor housing, the flow of motive fluid through said passageway being controlled by the valve.

7. In a rotary motor tool, a fluid pressure motor comprising a housing and a rotor including a spindle, a tool spindle, gearing connecting them, a housing enclosing the gearpassage of fluid ing and attached to the end of the motor housing, apair of cross bar handles secured.

, to the gear housing and one provided with a in the other housing, one of the'handles carfiuid supply passageway and the other with rying a valve actuating member which is an exhaust passageway, a reversing valve connected with the valve. I 10 carried by the gear housing, supply and ex- In testimony whereof, I hereunto afiix my 5 haust passageways formed in the gear houssignature.

ing and motor housing, those in one housing Y being in communicating relation with those JOHN J. N. VAN HAMERSVELD.

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