US3421392A - Power operated drill having fluid supply means - Google Patents

Description

Jan. 14, 1969 K. R. BANGERTER ET A1. 3,421,392

POWER OPERATED DRILL HAVING FLUID SUPPLY MEANS I Filed July 26, 1967 Sheet of 2 i 34o f- V I i .Ille so ,"1. g `45 g -47 12o /g -k 5o m '24F/G 2 sli i 52 S' g 9o ,|35c i* .88 -40` 68 INVENTORS iff: KENNETH BANGERTER 54 11W es se U/VE 5. 6A LE ATTORNEY.

Jan. 14, 1969 mRgANsan'rl-:R ETAL 3,421,392

POWER OPERATED `DRILL. HAVING FLUID SUPPLY MEANS Filed .my ze, 1967 sheet 25 of 2 United States Patent O 9 Claims ABSTRACT OF THE DISCLOSURE A rpneumatically operated hand drill including passage means for supplying uid through the drilling implement to a workpiece being drilled thereby. Fluid ow through the passage means is controlled by a normally closed valve which is arranged to be opened after the pneumatic motor of the drill has been actuated by pressurized air.

Background of the invention The present invention relates to power operated tools and more particularly to power operated drills of the type employed for drilling metallic and other similar workpieces.

During the operation of power operated drills of this type, a fluid is frequently directed on the workpiece for treating the latter as it is drilled. For example, during the drilling of extremely hard steel workpeces, freon has been supplied to the workpieces for cooling and providing them with a |hard iinish. Generally, however, this fluid has been supplied by an apparatus which is separate from the drill and which, moreover, discharges the iluid continuously throughout the entire operating cycle of the drill. rllhe employment of a separate apparatus for supplying the uid is, of course, undesirable in that it adds appreciably to the expense, bulk, and complexity of the tools required for the drilling operation. In addition, the aforementioned continuous supplying of fluid throughout the entire operating cycle of the drill is undesirable as it wastes the expensive iluid employed.

Summary of the invention The present invention comprises the provision of a new and improved power operated drill which is particularly constructed and arranged such that the uid is supplied to a workpiece only when the workpiece is being acted on by the drill.

Another object of the invention is to provide a new and improved power operated drill of t-he type set forth which is particularly constructed and arranged such that the fluid is supplied to the workpiece through the drilling implement of the drill.

The aforegoing objects, and those other objects and advantages of the invention which will be apparent from the following description taken in connection with the accompanying drawings, are attained by the provision of a power operated drill comprising driving means, control means actuatable to cause operation of the driving means, and a drilling implement including a working end adapted for drilling a workpiece and connected to the driving means to be rotatably driven during the operation of the latter. This power operated drill, moreover, comprises passage means for supplying fluid to a workpiece adjacent the aforementioned working end of the drilling implement, and valve means normally preventing fluid flow through this Ipassage means and automatically actuatable, in response to actuation of the control means, to permit iluid flow through the passage means. In addition, the drill also comprises a tool housing surrounding the working end of the drilling implement and movable upon engage- 3,421,392 Patented Jan. 14, 1969 ice ment with a workpiece, and means for actuating the control means in response to the movement of the tool housing.

Brief description of the drawings FIG. 1 is an elevational view, particularly broken away and in section, of a pneumatic hand drill including an embodiment of the present invention;

FIG. 2 is an enlarged, fragmentary sectional view of the drill illustrated in FIG. 1;

FIGS. 3-6 are fragmentary sectional views illustrating various components of the drill in their respective positions upon the initial actuation of the drill; and

FIGS. 7-10 are fragmentary sectional views illustrating said components of the drill during subsequent operation thereof.

Description of the preferred embodiment Referring more particularly to the drawings wherein similar reference characters designate corresponding parts thoughout the several views, FIG. l illustrates a pneumatically operated hand drill designated generally as 10 which comprises a housing or casing formed to include an elongated barrel 12 and a depending handle 14. The drill 10 is powered by a driving means comprising a vane type, pneumatic motor designated generally as 16 which is positioned within a motor chamber 18 located adjacent the rearward end 12b of the barrel 12. The motor 16, as illustrated in FIG. l, includes a rotor 20 wihich carries a plurality of vanes 22 and has an integral stub shaft 24, rotatably mounted by a ball bearing 24a, at each of its ends. Pressurized air for operating the motor 16 is supplied to the dnill l() by a pneumatic supply 'hose 26 which is connected to the drill 10 adjacent the lower end of the handle 14. The pneumatic supply hose 26 communicates with the motor chamber 18 through an inlet passage means comprising an inlet bore 28, a valve chamber 30, and a supply bore 32 such that pressurized air is supplied serially through the inlet bore 28, the valve chamber 30, and the supply bore 32 to the motor chamber 18.

The stub shaft 24 projecting from the forward end of the rotor 20 is connected at 35 by straight splines to a driving sleeve 34 which is rotatably mounted in ball bearings 34a, 34b. The driving sleeve 34, in turn, is threadedly connected at 36 to a locking sleeve 38.

A drilling implement or tool 40, having a twisted forward or working end 42, extends axially in the barrel 12 with its working end 42 in advance of the barrel forward end 12a. The rearward end 44 of the drilling implement 40 projects through the locking sleeve 38 into the bore 45 in the driving sleeve 34. The drilling implement 40 is connected to the motor 16 to be rotatably driven thereby through a collet 46, including a bore 47 tightly receiving the implement rearward end 44, which yhas a surface 46a frictionally engaging the driving sleeve 34 and is locked in position by the locking sleeve 38.

The working end 42 of the drilling implement 40 is normally enclosed within a tool housing designated generally as 48 which is mounted for axial slidable movement relative to the drilling implement 40. The tool housing 48 comprises a rst or rearward housing element 50, including a bore 52 slidably receiving the working implement 40 intermediate its ends, and a second or for ward housing element 54, including a bore 56 normally containing the implement Working end 42, which is threadedly connected to the housing element 50 at 5S. The housing element 54 and the working implement 40 are particularly `constructed and arranged such that the former normally projects in advance of the working end 42 of the latter. The bore 56 in the housing element 54, moreover, is constructed of a diameter suliciently larger than that of the working end 42 to enable cuttings to pass peripherally around the latter. The housing element 54 includes a plurality of slots 68 which communicate with the bore 56 for discharging the cuttings therefrom.

The rearward end of the housing element 50 extends into chamber 60 formed in the barrel forward end 12a and includes an enlarged cross-section piston 62. The tool housing 48 is forwardly biased by a coil spring 64, positioned circumferentially around the drilling implement 40, which is arranged with its opposing ends en-.

gaging the piston 62 and an annular spring seat 66 formed integrally with 4the barrel 12.

An inlet valve designated generally as 70 is provided for controlling the flow of pressurized air to the motor 16. The inlet valve 70 comprises a valve stem 72 which is slidably disposed within a bore 74, and a valve head 76, integral with one end of the valve stem 72, which is interposed within the valve chamber 30 of the aforementioned inlet passage means. The valve Ihead 76 carries a sealing ring 78 and is biased by a spring 80 arranged with its opposing ends engaging the valve head 76 and a spring seat 82, to a closed position wherein it seats on a valve seat 84 to prevent air flow through the valve chamber 30. The valve s-tem 72 is constructed of sufficient length such that, with the valve head 76 in this seated or closed position, the end 72a of the valve stem 72 projects substantially from the bore 74.

The actuating means of the driill is particularly `constructed and arranged such that the inlet valve 70 is automatically triggered to an open position in response to the engagement of the `housing element 54 with a workpiece. More particularly, as illustrated in FIG. l, the housing element 50 of the tool housing 48 includes an integrally formed, depending ilange 86 which is connected by a pin 88 lto one end of an actuating rod 90. The opposing end of the actuating rod 90 is slidably supported in a bore 92 formed axially through a tubular connecting member 94 which is, in turn, slidably carried by a support 96 threadedly connected in an annular ange 98 formed integrally with the barrel 12.

A wall of the connecting member 94 includes a pocket 100 containing a locking ba'll 102 which, with the drill 10 in the position illustrated in FIG. 1, locks the actuating rod 90 to the connecting member 94 for conjoined axial movement. The support 96, however, includes a recess 104 which is arranged to communicate with the pocket 100 after the actuating rod 90 and connecting member 94 have conjointly moved a predetermined axial distance. Thus, as will be understood, after this conjoined movement of the actuating rod 90 and the connecting member 94, the locking ball 102 moves into the recess 104 to permit axial movement of the actuating rod 90 independently of the connecting member 94. The extent of the aforementioned conjoined axia-'l movement of the actuating rod 90 and connecting member 94 is. of course, adjustable by movement of the support 96 relative to the flange 98. Thus, as will be seen, the threaded connecting between the support 96 and the ange 98 permits a simple, quick adjustment of this distance.

The connecting member 94 is slidably connected to one end of a trigger rod 106 which, adjacent its opposing end, is slidably supported by a mounting pin 108 carried by the handle 14. An actuating lever 110 is pivotally mounted by a pivot pin 112 upon the handle 14 intermediate the trigger rod 106 and the end 72a of the valve stem 72. The actuating ylever 110, as illustrated in FIG. 1, includes a linger-like `portion 114 engaging the trigger rod 106 and also has an end engaging the end 72a of the valve stem 72. Thus, axial movement of the trigger rod 106 causes pivotal movement of the actuating lever 110 which, in turn, urges the inlet valve 70 to an open position.

A supply hose 116, communicating with a source (not shown) of oil, Freon or other fluid suitable for treating a workpiece during the drilling operation, is connected to the handle 14 adjacent the lower end of the latter. The drill 10 is provided with a passage means which communicates with the supply hose 116 for conveying fluid from the latter through the drilling implement 40 to a workpiece drilled by the drill 10.

More particularly, this passage means comprises a valve chamber 118, formed in the handle 14 in direct communication with the supply hose 116, which is arranged to discharge fluid through an outlet port 120 into a bore 122. The bore 122 communicates with one end of a uid conveying hose 124 which, at its opposing end, communicates with a bore 126 formed through a connecting element 128 carried by the rearward end 12b of the barrel 12. A bore 130 is formed axially through the rotor 20 and the stub shafts 24 of the motor 16 in communication with the bore 126 and discharges uid received from the latter into the bore 45 in the driving sleeve 34. A bore 132 is formed axially through the drilling implement 40 and communicates with the bore 45 to receive the fluid therefrom. The bore 132 discharges this fluid onto a workpiece through an oriice 134 which, as shown in FIG. 7, is formed in the working end 42 of the drilling implement 40. The sealing elements 135:1, 135b, and 135e` are provided for preventing fluid leakage from the passage means.

A valve means designated generally as 136 is located in the valve chamber 118 for controlling the flow of fluid through the aforedescribed passage means. The valve means 136, more particularly, comprises a valve stem 138 which slidably extends through a bore 140, and a valve head 144 which is rigidiy mounted upon one end of the valve stem 138 and disposed in the valve chamber 118. The valve head 144 carries a sealing ring 146 and is biased by a spring 148 to a closed position wherein it seats on a valve seat 150 to prevent fluid flow from the supply hose 116 to the outlet port 120. The valve stem 138 is aligned with the inlet valve 70 and constructed of suitable length such that, with the valve head 144 in the seated or closed position, the end 138a of the valve stem 138 projects through the opening 142 in the spring seat 82, but is suiciently spaced from the valve head 76 of the inlet valve 70 to enable the valve 70 to be opened before the valve head 76 urges the valve means 136 to an open position.

This spaced arrangement of the valve 70 and the valve means 136, in addition to conserving the freon or similar Huid, provides a safety feature in that, it reduces the possibility of the fluid causing injury in the event of accidental operation of the drill 10.

From the foregoing description, it will be seen that, with the drill 10 in non-operating condition as illustrated in FIG. 1, the inlet valve 70 and the valve means 136 are maintained in closed positions by the springs 80 and 148, respectively. Thus, at this time, the inlet valve 70 prevents pressurized air from flowing to the motor 16; and the valve means 136 similarly prevents tluid from owing to the bore 132 in the drilling implement 40.

However, when the housing element 54 of the tool housing 48 is engaged with a workpiece 152, as illustrated in FIG. 3, the tool housing 48 is urged rearwardly against its biasing spring 64. This movement of the tool housing 48 causes the working end 42 of the drilling implement 40 to engage the workpiece 152 and, as the actuating rod 90 is locked to the connecting member 94 by the locking ball 102 as shown in FIG. 4, simultaneously provides conjoined axial movement of the actuating rod 90 and the connecting member 94. This axial movement of the connecting member 94, in turn, causes axial movement of the trigger rod 106 and resultant pivotal movement of the actuating lever 110. Thus, the inlet valve 70 is urged to an open position wherein pressurized air from the pneumatic supply hose 26 ows to the motor 16 through the aforementioned inlet passage means. The inlet valve 70 and the valve means 136, as aforedescribed, are sull-lciently spaced such that, as shown in FIGS. 5 and 6, the initial opening of the inlet valve 70 has no effect upon the valve means 136.

The continued rearward movement of the tool housing 48, however, acts (through the actuating rod 90, the connecting member 94, the trigger rod 106, and the actuating lever 110) to sufficiently displace the inlet valve 70 such that the latter urges the valve means 136 to an open position. Thus, although the initial actuation of the motor 16 (and hence the initial portion of the drilling operation) is not accompanied by uid ow through the bore 132 to the workpiece 152, the succeeding portions of the drilling operation are accompanied by such iluid flow. (It will be understood, however, that, if desired, tluid ow could be provided during the initial portion of the drilling operation by providing the drill with a suitably constructed drill template (not shown).)

When the tool housing 48 has been sufciently rearwardly moved, as illustrated in FIG. 7, to cause alignment of the slots 100, 104, as shown in FIG. 8, the locking ball 102 unlocks the actuating rod 90 from the connecting member 94. Thus, although the inlet valve 70 and the valve means 136 are maintained in open positions 'as illustrated in FIGS. 9 and 10 during subsequent drilling in the workpiece 152, the actuating rod 90 moves axially relative to the connecting member 94. This relative axial movement, as will be understood, enables the drilling implement 40 to form a deeper bore than would be normally possible were the actuating rod 90 and the connecting member 94 continuously connected for conjoined axial movement.

After the drilling operation, the removal of the drill 10 from the workpiece 152 enables the spring 64 to return the tool housing 48 to its FIG. l position, whereupon the springs 80 and 148 automatically return the inlet valve 70 and the valve means 136, respectively, to closed positions. Then the drill 10 is ready to drill another hole in the aforedescribed manner.

From the aforegoing it will be seen that we have provided new and improved means for accomplishing all of the objects and advantages of our invention. It will be understood, however, that, although we have illustrated and hereinbefore specifically described only a single embodiment of our invention, the invention is not limited merely to this single embodiment, but rather contemplates other embodiments and variations employing its teachings and concepts.

Having thus described our invention, we

1. A power operated drill comprising:

a tluid operated motor;

inlet passage means for supplying pressurized fluid to said motor;

inlet valve means normally preventing uid flow through said inlet passage means and actuat'able to permit fluid ilow therethrough;

a drilling implement inclu-ding a working end adapted for drilling a workpiece and connected to said motor to be rotatably driven thereby;

second passage `means for supplying uid to a workpiece adjacent said working end of said drilling implement;

`second valve means normally preventing fluid ow through said second passage means and automatically actuatable, in response to actuation of said inlet valve means, to permit uid flow through said second passage means;

a `tool housing surrounding said working end of said drilling implement and movable relative thereto upon engagement with a workpiece; and

means for actuating said inlet valve means in response to the movement of said tool housing.

2. A power operated drill according to claim 1, further comprising said actuating means including la rst actuating member movable in response to movement of said tool housing and a second actuating mem'ber normally connected to said first actuating member for conjoined movement therewith and separable from said first actuatclaim ing 'member after a predetermined distance of said conjoined movement.

3. A power operated drill according to claim 2, further comprising lever means pivotable in response to movement of said `second actuating member, said valve means being arrange-d such that pivotal movement of said lever means actuates said inlet valve means and the latter, in turn, actuates said second valve means.

4. A power operated drill according to claim 2, further comprising said actuating members telescoping one into another, and detent means interconnecting said members for said conjoined movement.

5. A power operated drill according to claim 1, further comprising said actuating means including a first actuating member axially movable upon movement of said tool housing and a second actuating member including a longitudinal bore slidably receiving said first actuating member, a support slidably supporting said second actuating member, and detent means interconnecting said actuating members for conjoined axial movement, said support including a recess arranged to receive said detent means after a predetermined distance of said conjoined movement whereby, after said predetermined distance, said first actuating member is axially movable relative to said second actuating member.

6. A power operated drill according to claim 1, further comprising said tool housing being spaced from said drilling implement to provide passage means therebetween, and slot means in said tool housing communicating with such passage means for discharging cuttings therefrom.

7. A power operated drill according to claim 1, further comprising said motor including a rotor, a driving sleeve rotatably driven by said motor and rotatably driving said drilling implement, and said second passage means inc1uding communicating bores through said rotor, said `driving sleeve, and said drilling implement whereby said second passage means supplies fluid through said working end of said drilling implement.

8. A power operated drill comprising:

driving means;

control means actuatable to cause operation of said driving means;

a drilling implement including a working end adapted for drilling a workpiece and connected to said driving means to be rotatably driven during the operation of said driving means;

passage means for supplying fluid to a workpiece adjacent said working end of said drilling implement;

valve means normally preventing fluid ow through said passage means and automatically actuatable, in response to actuation of said control means, to permit fluid flow through said passage means;

a tool housing surrounding said working end of said drilling implement and movable upon engagement with a worpiece; and

means for actuating said control means in response to the movement of said tool housing.

9. A power operated drill according to claim 8, further comprising said valve means being arranged to be actuated after said control means causes operation of said driving means.

References Cited UNITED STATES PATENTS 1,102,012 6/1914 Curnow 173--79 XR 1,630,835 5/1927 Doyle 77 55.3 1,698,970 1/1929 shaft 173-49 XR FOREIGN PATENTS 633,052 12/1949 Great Britain.

FRANCIS S. HUSAR, Primary Examiner.

U.S. Cl. X.R.

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