US2147045A - Percussion tool - Google Patents

Description

PERCUSSION TOOL Filed Dec. 30, 1935 3 Sheets-Sheet 1 l" w I |NVENTO I I ificfl fovd Lzmbk E I ATTORNEYS H. LEMBKE Feb. 14, 1939.

PERCUSS I ON TOOL Filed Dec. 30, 1955 5 Sheets-Sheet 2 INVENTOR cgfovd Lembke ATTORNEYS Feb. 14, 1939.

H. LEMBKE PERCUSSION TOOL Filed Dec. 30, 1935 5 Sheets-Sheet 3 84 INVENTOR ffl l 0rd L/zmbkz I rM ATTORNEYS Patented Feb. 14, 1939 PATENT OFFICE PERCUSSION TOOL Halford Lembke, Seattle, Wash.

Application December 30, 1935, Serial No. 56,796 In Germany December 18, 1935 11 Claims.

* My present invention relates to the art of percussion tools and more particularly to a mechanically operated percussion tool.

Percussion tools of various types have been used for many years, for drilling, and riveting, chipping, caulking and like purposes. In the field of rock drilling, however, the general tendency has been toward-the use of air-operated tools, despite the fact that there are many virtues in electric operationof rock drilling equipment. This present design follows, in part, the general principles of my United States Patent #2,029,326 dated February 4, 1936. Certain modifications have been made in this present design, however, which make it particularly adaptable for the drilling of holes in rock, and like materials. In my present construction I have provided a tool which is somewhat similar in appearance and is used in the same' manner as air-operated tools which are used as drifters, stoppers, and for other drilling purposes.

While my striking mechanism and revolving mechanism is entirely mechanical it is driven, preferably, with an electric motor turning at uniform speed. I have provided water supply means following the usual practice of'such tools. The weight of blow, which has always been a problem in the mechanically driven rock drills as distinguished from air operated, can be controlled to a nicety from zero to the maximum blow the motor is capable of producing, with any desired variation between these two limits.

Another object is to provide a drilling tool in which means is provided to revolve the drill so that proper clearance will be provided for the drill bit.

Another object of my invention is to provide means whereby the.shock incidental to the operation of my present device will not be transmitted to the entire mechanism and thereby I am able to greatly increase the normally expected life of this equipment.

Other and more specific objects will be apparent from the following description taken inconnection with the accompanying drawings, wherein Figures 1 and 2 show, in elevation and in section, the working parts of my mechanism. The two views if placed coaxially would represent the entire tool.

Figu e 3 is an elevation of my device, certain parts being shown .in sectional view to better vertical section, taken through the contacting cam members of the driving and driven rotor members, showing a modified construction.

Figure 9 is a cross-sectional view taken along the line 99 of Figure 8.

Figure 10 is a cross-sectional view taken along the line Ill-10 of Figure 2.

Referring to the drawings, throughout which like reference charactersindicate like parts, 8 designates the rotor of my tool. This is supported by, and driven by, the power shaft "I. As is probably best illustrated in Figure 6, rotor 8 is provided with a plurality of opposed revolvable cam faces, the most convenient form being balls or rollers 12, each of which is: seated within a removable ball seat I4. For the sake of simplicity I have referred to the cam faces as balls throughout this specification. In Figure 6 I have shown two pairs of balls. I wish it to be fully understood that the number of balls is determined by the speed of the motor and the number of blows it is desired that the machine strike; increasing the number of balls increases the number of blows. Each ballholder I4 is provided with a cover member i6 which in turn is secured in place by the. retaining and stop screw I; which is flanged over so as to overlap cover l6 and thus secure them against displacement. In the form illustrated I have shown holder ll, with extension members l9 passing through flange 20, formed as part of shaft Ill, and secured in position by suitable washers and nuts, as 22. In certain forms it might be more desirable to use a splined drive between shaft l0 and rotor 8. In order to relieve my strike mechanism of as much shock as possible incidental to the operation of the machine, I provide rotor 8 with a stub shaft 24 seated upon compression spring 25 which, in turn, is housed within shaft I0. I have further provided a tubelike extension on stub-shaft 24 to center one end of spring 25 and at the opposite end have provided a washer having a similar extension 26. Bolt l9 and nut 22 have, as a further object, the initial compression of this spring so that there will be no slack in the mechanism.

Shaft Ill extends through and supports the motor armature 28, being suitably keyed thereto so as to impart the rotary driving effort of the armature to the shaft when acted upon by the stator 30. Shaft 10 is mounted upon the antifriction bearings 3| and 32. signed to take both radial and thrust loads as considerable thrust is imparted to the same when the tool is in operation and the tendencyfwhen the balls of the rotor and stationary ercussion 50 Bearing 32 is demembers collide, is todrive rotor 8 to the right as viewed in Figures 1 and 2. A suitable fan 33 is provided to cool the electric motor when in use. This fan obtains its cooling air through opening 34. Air is supplied to opening 34 through channel 36 which in turn is formed by the guard member 38 lying over the same so as to shield the opening and prevent any foreign material entering the same. The cooling air is expelled through a plurality of openings 40 in end plate 4I. As a matter ofconvenience I have provided a plug in electrical connection at 42 so that the electric current supply cable 44 may be easily Disposed co-axially with shaft I0 and rotor 8- is the reciprocating striker head 46. This is arranged with a plurality of balls or rollers 48 which are seated in removable seats 50 and held in place by means'similar to that employed in the rotor. The reciprocating member 46 is disposed for reciprocation within bushing 52 it being provided with a relatively long tubular shaftextension 54. Disposed within the outer end of the tubular shaft 54 is a drill clutch which is adapted to be driven for rotation by shaft 46 which has jaw clutchmembers that in turn engage with similar jaw clutch members formed in the outer end of shaft 54. Bushing 56 forms no part of this present invention and is a stock arrangement which is adapted to engage deformed drills 58 after a manner well known in this art. This provides against, the drill being pulled out of the machine and also permits it to be revolved. Disposed at the right hand end of bushing 52 as viewed in Figure 1 is a water gland arrangement 60. This con- .sists of, preferably, leather or other yieldable packing members 6| and 62 which are held in place by the collar-like metal members 64. This is relieved sufficiently so that water entering through tube 66 will pass through the opening provided in member 64 through the opening 61 provided in shaft 54, and then into the anvil member 68 where it enters a thin, flexible water tube 10 adapted to seat well into the water-passageway 12 passing through bit 58.

In order that the drill may be fed into the rock after the common practice in rock drilling tools, I have provided guides 14 which are formed as part of the main housing members 16 and 18 which, in turn, are bolted together by a plurality of encircling bolts 80. These guide-ways rest in, and are guided by, guideways 82 which are formed in the carriage member 84. A threaded nut 86 is provided for engagement with the longitudinally extended, threaded rod 81. On each side of nut 86 are cushioning springs 88 and 89, which lessen ure 8 to be the most satisfactory. These are provided with holders formed of two parts as 96 and 81. These are arranged to house the rollers in a secure manner so as to retain them definitely in position and the two members 86 and 91, making up the holder, part along the axis of rotation of the roller. The outer, or covering, members 96 are so machined that only a portion of the rollers extend through the same. Thus they provide definite keepers for the rollers. To provide against outward movement of the holder I have employed a plurality of large headed bolts 88 so arranged that the large heads overlap the margins of the holders which are machined to provide a recess for the bolt heads as is probably best illustrated in Figure 9. The bolts then extend through members 8 and members 46, respectively, and are held securely in place by the castellated nuts I00. Lubrication is provided as in the former construction employing the ball assembly.

Under certain conditions it is desirable to dispense with the studs or holder extensions I9, as shown in Figure 1, and to employ as a driving means between shaft I0 and head 8 a keyed or splined coupling. This consists of spline I02 cut on the stub-shaft 24 and mating splines which are cut in shaft I0 as illustrated at I03. This arrangement takes over the driving function of pin I9, and the annular flange I05 prevents spring 25 forcing stub-shaft 24 out of the hollow shaft I0. The annular flange I05 terminates in a lip I06 which is adapted to engage an annular rim, or lip, I01 which is part of shaft I0. Bolts 98, serving in a dual capacity, secure flange I05 to head 8.

In Figure 10 I have illustrated somewhat in detail nut 86 which forms the connection, through springs 88 and 89, between screw 81 and the main drill housing. Nut 86 has transversely disposed wings I09 and II 0 which are adapted for movement longitudinally of screw 86, within guideways 82, the feet 14 of housing 18 being reduced in thickness for a short extent so as to accommodate wings I 08 and 0.

It will be apparent it is believed as rod 81 is revolved by means of handle 90 the entire drill will be moved toward, or away from, the rock face.

Method of operation In operating my tool, as soon as bit 58 engages the rock face, it is naturally arrested in its forward movement and as the drill, housed in member 16 and I8, is fed toward the face, the recipro= cating member 46 is brought into contact, or nearly into contact, with rotor 8. In this condition balls '48 collide with balls I2 and a quick, camming action occurs, which throws member 46 toward.the face, forcing the drill into the rock a short distance. At the same time the rotary action of rotor 8 tends to turn member 46 in bushing 52 and thus the cutting bit faces 92 are presented to new uncut material. This provides a round hole and ample clearance for the satisfactory operation of my tool.-

The forego ng description and the accompanying drawings are believed to clearly disclose a preferred embodiment of my invention but it will be understood that this disclosure is merely illustrative and that such changes in the invention may be made as are fairly within the scope and spirit of the following claims:

What I claim is:

l. The combination in a percussion tool, with a rotary shaft and its rotor, and a resilient, axially alined connection between said shaft and rotor, of a co-axial reciprocable striking head capable of an intermittent rotary movement, and coacting revolvable cam members mounted in the adjoining faces of the rotor and head.

2. The combination in a percussion tool with a rotary shaft and its rotor, and a resilient support between said shaft and rotor, of a co-axial reciprocable striking head capable of an intermittent rotary feed, means for limiting the recoprocating movement of the head, and co-acting revolvable cam members mounted in the adjoining faces of the rotor and head.

nection between said shaft and rotor, of a co-.

axial reciprocable striking head capable of an intermittent rotary movement, and a pairof, coacting revolvable ball cams mounted in the ad-.- joining faces of said rotor and head.

4. The combination in a percussion tool with a rotary shaft having a tubular end, and a rotor having a stud-shaft mounted in said end and reciprocable therein; of a co-axial reciprocable striking head capable of an intermittent rotary movement, and a pair of co-acting revolvable ballcams mounted in the adjoining faces of said rotor and head.

5. The combination in a percussion tool with a rotary shaft having a tubular end, a rotor having a stud-shaft mounted in said end, and a spring interposed between said shafts, of a co-axial reciprocable striking head capable of an intermittent rotary feed, and a pair of co-acting revolvable ball-cams mounted in the adjoining faces of I said rotor and head.

6. The combination in a percussion tool with a rotary shaft having a flanged end and a co-axial rotor, of a pair of spaced seats mounted in the flanged end, a revolvabie cam in each seat, retaining washers for the cams, and a central, flanged screw threaded in the rotor and engaging said washers, of a co-axial reciprocable striking head capable of intermittant, rotary movement, and revolvable cam members mounted in the face of said head.

7 The combination in a percussion tool with a rotary shaft having a flanged end and a co-axial rotor, of a bolt mounted in the flange and a nut therefor, said bolt having a head in the rotor forming a seat, and a' ball-cam retained in said seat, of a c'o-axial reciprocal striking head capable of rotary movement, and revolvable cam members mounted in the face of said head.

8. The combination in a percussion tool with a rotary shaft having a tubular, flanged end, and a co-axiai rotor having a stub shaft in said tubular end, of a bolt mounted in the flanged end and a nut therefor, said bolt having a head in the rotor forming a seat, and a revolvable cam retained in said seat, of a co-axial reciprocal striking head'capable of intermittent, rotary movement, and revolvable cam members mounted in face of said head.

9. The combination in a percussion tool with a rotary shaft having a tubular, flanged end, a coaxial rotor having a stub shaft in the tubular end, and a spring interposed between said shafts, of a cam mounted in the flanged end, of a co-axial reciprocal striking head capable of intermittent, rotary movement, and revolvable cam members mounted in face of said head.

10. The combination in a percussion tool with a rotary, tubular, flanged shaft, a co-axial rotor, a stub shaft on said rotor mounted in the tubular shaft, and a spring between said shafts, of a pair of spaced bolts mounted in the flanged shaft and nuts for the bolts, each of said bolts having a head in the rotor forming a seat, a revolvable cam in each seat, retaining washers for the cams, and a central flanged screw threaded in the rotor and engaging said washers, of a co-axial reciprocal striking head capable of intermittent, rotary movement, and revolvable cam members mounted in face of said head.

11. The combination in a percussion tool with a rotary shaft and a rotor, and a resilient support between said shaft and rotor, of a co-axial reciprocable striking head capable of an intermittent rotary feed, means for limiting the reciprocating movement of the head, revolvable cam members mounted in the face of the rotor and co-acting cam members mounted in the face of said head.

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