US3195375A - Portable drills - Google Patents

Description

July 20, 1965 o. E. GUIBERT, JR., ETAL 3,195,375 7 PORTABLE DRILLS Filed Aug. 1, 1962 4 Sheets-Sheet 1 1 ENTORS aacAefuqfi/vsg/mem; J2. fi Mum/40. JAM/50M J2.

yam M THE/z Arm eusv y 1965 o. E. GUIBERT, JR.. ETAL 3,195,375

PORTABLE DR ILLS Filed Aug. 1, 1962 4 Sheets-Sheet 2 SM W H mfiu u m: x 2 E 0 w EJ A hm H T EL Al- Wu? UJv N i y 20, v1965 o. E. GUlBERT, JR., ETAL 3,195,375

PORTABLE DRILLS Filed Aug. 1, 1962 4 Sheets-Sheet 3 1,111,111., I! Y X THE/l? ArmeA/E Y July 20, 1965 Filed Aug. 1, 1962 0. E. GUIBERT, JR., ETAL PORTABLE DRILLS 4 Sheets-Sheet 4 ToRs 0504i EuGA'L Xg/AE JA #W/Zr L/AMD- JAM/50M, Jle.

FIE/E Arrazuv United States Patent PORTABLE DRILLl Oscar Eugene Guibert, J12, Pittsburgh, Pa and Wiiliarn D.

Jamison, Jr., Hudson, Ohio, assignors, by rnesne assignments, to Western Fennsylvania National Bank, a national banking institution, mortgagee, Pittsburgh, Pa.

Filed Aug. 1, 1962, Ser. No. 215,221 Claims. (Cl. 777) This is a continuation-in-part of application Serial No. 9,322 filed February 17, 1960, and now abandoned.

This invention relates generally to drills and more particularly to portable drills.

The problem that arose with portable drills for use in drilling holes in plates and other forms of structural steel laying on the ground or in stock piles resides in the excessive weight required to hold and force the drill into the metal. Very heavy weights were added to provide the proper drill force as disclosed in US. Patent 1,927,005. The penetrating ability of this drill is determined on the weight supported by the carriage, which weight was obtained by the motor and was augmented by the counterweights of which there were seventeen in actual practice. These weights were not only outboard of the wheel means but were also hung on the sides of the carriage making the machine extremely difiicult to handle in moving the same from one drilling position to another over sets as well as structural shapes in a yard or in a structure. These weights on the frame of the machine together with the machine weighed 1600 pounds and it was necessary to provide the very long operating arm which not only aided in drilling but also as a leverage for maneuvering and transporting the drill from one hole location to another.

The U-shaped leg is provided on this drill and was always extended when the drill was operating to drill a hole. This extended leg supported a portion of the weight of the machine on the member to be drilled to relieve the operator from supporting the machine while the machine was in drilling position.

The leg and the rollers support the total weight of the machine. As the operator applies a drilling force to the operating lever the drill engages the work and the weight load redistributes between the rollers and the leg and the drill. As the operator increases the drilling pressure more pressure is transmitted to the drill. The increase in drill pressure reduces the load on the rollers as one would ordinarily suppose. The increased drill force also increases the pressure between the drill and the work and also increases the holding requirement of the anchor means.

When an increased operator weight load on the operating lever decreases the weight load between the rollers and the work to zero, an unstable condition exists and the drilling operation may swing the machine free as the weight through the rollers to the work is insufficient to maintain friction for holding the whole drill carriage from rotating about the drill which usually results in the breakage of the drill and if the drill is on a structural part this situation could be quite hazardous to the life and limb of the operator.

The principal object of this invention is the provision of a hold down clamp or anchor that provides a reaction pressure for drilling heavy metal or hard materials without the necessity of a heavy and weighted structure. This lightweight drill is quickly moved from one hole position to another. Again the hold down or anchor permits faster drilling. Thus the production is increased to more than twice that of the weighted drill.

Another object is the provision of a universal joint between the hold down clamp and the work to permit lineal movement for alignment.

33;, l ,3 Patented July 20, 1965 "ice- Another object is the provision of a mechanical hold down clamp that may operate in a hole, over the edge of the stock, or hooking over both edges of the stock.

Another object is the provision of a hold down clamp, anchor, or reaction pressure member that is magnetic for use in holding the drill against magnetizable materials or against nonmagnetizable materials having a magnet or magnetizable material thereunder. The magnet has its limitations in its ability to hold on which is not true of the mechanical anchors but the time required to set and reset the mechanical anchors is offset by the production speed when employing an electromagnet as an anchor.

When drilling with the machine as disclosed in this application the electromagnet functions to prevent the wheel means from losing their load transference. Each means on the frame, wheel means, rotary drill means, motor means, linkage means, operating lever means and anchor means are all selectively positioned on the frame relative to each other so that the sum of the drilling force and the wheel means load pressure is substantially constant throughout the drill force range. This is why a flexible cable could be employed as this anchor as it actually is diagrammatically represented by a negative force vector through the full operating range and it has the function of retaining additional weight force through the wheel means 6 against the work with more power to drill and less weight to handle which is a new inventive conception in this application. Better performance is obtained at higher speed drilling. The increased horsepower and thrust of this improved drill makes this possible and was not possible with the old drill.

The increased horsepower and speed of the motor of this drill without increasing the weight of the machine is eifective in increasing the whole of the machine operating range.

To gain the performance of this improved drill of the present application the machine of the Guibert patent would have to weigh approximately over one ton.

Another object is the provision of an adjustable stop to stop the movement of the drill in either direction.

Other objects and advantages of this invention appear hereinafter in the following description and claims.

The accompanying drawings show for the purpose of exemplification without limiting this invention or the claims thereto, certain practical embodiments illustrating the principles of this invention; wherein-- FIG. 1 is a perspective view of the drill comprising this invention.

FIG. 2 is a view in side elevation of the drill comprising this invention.

FIG. 3 is a view in side elevation of a portion of the linkage and the stop.

PEG. 4 is a view in end elevation of the stop shown in FIG. 3.

FIG. 5 is a view in end elevation showing a mechanical clamp that embraces the work to prevent relative movement to the drill.

FIG. 6 is a View in end elevation showing a clamp in the form of a lateral flange to engage in a hole to retain the drill.

FIG. 7 is a detailed view of the pivotal connection in the lever system.

Referring principally to FIGS. 1 and 2 of the drawings the portable drill comprising this invention includes a frame covered body 1 having the depending flanges 2 with a slot 3 in the bottom thereof to receive the shaft 4 threaded at its ends to receive the nut 5. The shaft 4 functions as an axle for the wheels 6 and may be secured to the spaced flanges 27 The wheels 6 preferably extend substantially the full width of the frame covered body 1 and are preferably made in two sections to permit the drill to be readily turned.

The frame covered body ll provides a pivot member 7 for the arm 8 that extends beyond the end of the body l. This arm is constructed with a tubular member 1d secured to a rod member 1i which'has the pivot 7 secured thereto. The rod member 11 is U-shaped and crosses the front of the machine as indicated at 12 and the pipe sections are secured to each face. One or both of the pipe sectionsltl carry the control wires 13 which are flexible between the end of the pipe it as indicated at, 14 and the clamp 15 on,

the side of the body 1. The flexible cables 13 extend through the, pipe end to the controls, two of whichare shown, one being the switch for the magnet 16 and the switch for the motor 17.

The outer end of-the arm his provided with a seat 2.8

that has handles 20 extending on either side thereof. The operator sits on the seat and controls the electric switches and employs his Weight as part of the force for drilling the hole.

Adjacent the pivot 7 of the arm 3 the U-shaped rod member 311 is provided on each side of the machine with an upwardly extending flange 21 which carries a spring loaded pin member 22 that forces the pin into any one of the selected :holes 23 of the yoke 24. pivoted to the link 25 of the lever system 26. The link 25 is provided with the pivot 27 at one end that slides in the slots 28 and the brackets 30 on the upper end of the body. The other end of the link 25 is pivoted as indicated at the pivot points 31 on opposite sides to the clutch member 32. The clutch member 32 is stationary relative to the spindle 33'which it surrounds and is held by the collars 34 that are fixed to the spindle 33 so that any upward or downward movement of the link 25 will move the spindle vertically. The pivots 31 between the'clutch and the link 25 are disposed in the vertical axial plane of the spindle 33. The links 35 which are held by the pivot 36 that also holds the yoke 24 to the link 25 is likewise pivoted to the ears on the upper side of the body l and on each side of the spindle 33 and in line with the axial center of the spindle. Thus the links 35 and the upper portion of the link 25 are combined to maintain a straight line movement since the pivot 27 may ride back and forth in the slots 28 upon the vertical movement of the handle 8.

The spindle 33 hasa spline connection with the interior of the transmission member 37 and is rotatably supported within the frame 1 and is driven from a shaft 33 through the flexible coupling 40 and the shaft 4-1 from the electric motor 42. The end of the motor 42 is provided with the gear reducer '43 which is controlled by the lever shifting device 44 to gain different speeds in the. output shaft 41. The boss 45 is for the purpose of inserting an electric cable to supply the motor and other parts of the machine with electricity. 7

The'roll end of the spindle 33 is provided with a chuck 46 receiving the drill members. framel is provided with a transverse foot member 43 having a vertical shaft 50 upon which is adjustably secured the leveling foot 51 which carries the depending section 52 providedwith a transverse shaft 53 that supports the magnet 54'that functions as an anchor. Thus the magnet 54 is movable about the vertical axis of the shaft Sil. It is likewise movable about the horizontal axis of the shaft 53 for the purpose of making large adjustments. However, the actual support between the shaft 53 and the magnet 54 is provided with a spherical bearing 55 that allows the magnet 54 to have limited universal movement relative to the leveling foot connector 52. Thus vertical shaft 5i) and'the horizontal shaft 53 may be employed to obtain their principal adjustments of the magnet and further adjustment is obtained through the universal joint of the ball and socket spherical bearing 55. This insures the proper presentation of the under face 56 of the magnet 54 against the magnetizable surface in which the magnet holds the body 1 as an anchor and also holds the machine through The yoke 24 is The under side of the t the wheels d to the member to be drilled and against the pressure of drilling. The operator sittingon the seat 13 and operating a magnet switch 16 to anchor the machine in place then operates the switch 17 to control the electric motor drive to rotate the spindle and by shoving down and adding his weight to the. end of the arm '8 the drill bores into the steel or other member being drilled. This anchor means offsets the operating force such as the weight of the operator for maintaining a load pressure through the wheel means 6 against the member to be drilled and to increase the drilling pressure without increasing the Weight of the portable drill.

If the material is nonmagnetic it can be jigged in a steel jig which functions to permit the magnet 54*to'becoine attracted thereto for holding both the material and the tool while the material is being drilled.

To supply the magnet 5 with electric energy a rectifier such as a dry disc or a crystalline rectifier structure is mounted as indicated at 57 in theframe 1; This rectifier may be full or half wave rectifier supplied with alternating current to convert the same to direct current and thereby energize the coil in the magnet that is wound about a C- shaped armature, the pole faces of "which are open to the bottom 56 of the magnet 54 for the purpose of maintaining magnetic contact therewith.

While. drilling one must be able to limit the downward aswell as the upward movement of the drill which is accomplished through the linkage as shown in FIG. 3. The under side of the link 25 has the depending link 60 pivoted to the pivot point 39 carried by the link 25. The link 63 being held in the center of the link 25 by means of the spacers 61. The lower end of the link 60 is pivoted at 62 to the bifurcated lever member 63 that provides the two arms 64 and 65 that arepivoted intermediate of their ends at 66 and are connected at their free ends by the rod s7. .The arms or and 65 permit the lever 63 to pass on opposite sides of the spindle 33 aud'also extend on opposite sides of the two stop adjusting screws 68 and 69 both of which are rotatably supported in the bracket '75 and are actuated by the wheels 71 and 72. Each of the stop adjustingscrews are provided with a stop member as indicated at '73 and 74. The'stop member 73 is the stop that engages the lever 63 when its .free'end 67 is at the upper end of its movement which would represent the lower stop limit in drilling. The other stop 74- on the screw 63 limits the free. end 67 of the lever 63 when swinging in the opposite direction which is when the drill is raised. Thus by rotating each one ofthe wheels 71 and 72 the stops 73 and 74 may be adjusted so that whenthe drill has finished the work it is supposed to do whether drilling down or up or whether being raised to go to the next hole, the stops 73 and 74 are so adjustedto limit the extent of the operation of the drill. With these stops a drilled hole maybe counter sunk orrearned as well as drilled. The stops merely function as with any drilling equipment to produce a shoulder or other similar functions in drilling. The hand wheels 71 and 72 are close to the operator station and may be readily operated to make the proper adjustments of drilling. A rack 75 is mounted on the body 1 and is provided with one or more slots 76 to receive the spring biasedpin 77. By withdrawing the pin 77 from one of the slots or holes 76 one may move the tongue. or arm 8 about the pivot point 7 and relative to the body ll. This permits the seat 18 andthe controls associated therewith to be placed at different angles for the'conveniencc .of the operator and the slots 76 provide a quick mode of returning and interlocking the handle 8 at definite positions relative to the body 1. In'some instances it is preferable to have only one position so that the handle is always known to be in the most likely horizontal position relative to the body. However, a section of openings 76 may be provided to effect definite angular positions of the arm or tongue relative to the body 1.

In the structure shown in FIG. 5 the leveling foot 51 has the eye 80 extending downwardly therefrom and is secured by the nut 81 to the horizontal bar 82. The horizontal bar 82. has opposed adjustable brackets 83 secured thereto by the eye bolts 84 with the nuts 85 and the quick lock earns 86. Thus by throwing the cam away from the bar the eye bolts 84 become loose relative to the horizontal bar 32 and the brackets 83 may be readily adjusted therealong. As shown in FIG. 5 the structural shape is in the form of an I-beam 87 which is to be drilled. The drill is actually oif center for the purpose of drilling the flange by adjusting the brackets 83 relative to the center line. The bottom of the brackets 33 is permitted to rest on the top of the I-beam 8'7 and the clamping or anchoring fingers 88 are brought upwardly until they engage the under side of the flange at which time the spiral wedge locks 89 are rotated to hold the clamping fingers tight against the under side of the flange. This mechanical anchor clamp may be employed for drilling nonmagnetic materials or even magnetic materials but it is some: what slower owing to the fact that the anchor clamp has to be adjusted by hand, whereas the electromagnet merely requires the throwing of a switch.

The other mechanical hold down or anchor is in the form of a hold lock wherein the horizontal bar 82 is provided with a bracket 90 that has depending therefrom the stern member 91 provided with a head 92 which head is smaller in diameter than the hole 93 in the flange or plate 94 which represents the workpiece. This permits the head 92 to be dropped down through the hole 93 and caught under the same as shown in FIG. 6. A sleeve 95 which is slidable over the head 92 is of course larger than the hole 93 and engages the upper surface of the workpiece 94. The stem 91 is provided with a slot 96 to receive the wedge 97. When the wedge 97 is driven into the slot 96 it forces the sleeve 95 against the top surface of the workpiece and thereby mechanically holds or anchors the drill against movement. Here again the mechanical device to hold the drill in place takes more time to operate than the electromagnet.

The drill comprising this invention has a total weight of seven hundred and thirty pounds as against fourteen hundred and sixty-six pounds for the drill of the aforementioned patent. This latter machine has side weights of 601 pounds and rear weights of 352 pounds. The machine itself weighs 513 pounds.

The following nomenclature represents the several weights and forces of the patented drill and the present drill.

Patented Present F1= Operating force Ws=Stripped machine weight W1=Side weights W2= Rear weights W=T0tal machine weight Rw=Wheel r n Rf= Foot rcaeti0n Rm=Magnet reactiom Rs Spindle reactiorn- The following is a comparative table of both machines.

Old Machine New Machine F1 Re R] Rw Fl+Rw Fl Rs Rm Rw Fl-l-Rw It will be seen from the foregoing tabulation that the drill comprising this invention provides a machine wherein the wheel means, the drill means, the motor means and the lever and linkage means are selectively positioned relative to each other and to the anchor means so that the sum of the force applied to the operating means and the load pressure through said wheel means to the member to be drilled remains substantially constant drilling range as shown by these tabulations.

We claim:

1. A portable drill comprising a frame having wheel means to support a motor driven drill as a mobile unit, the drill being operated by an actuating mechanism through an operating lever pivoted on said frame and extending in a direction opposite from the Wheel means relative to said drill, characterized by a pivot for said operating lever positioned on said frame in a vertical plane between said wheel means and said drill, and a pivotal connecting means between said operating lever and said drill actuating mechanism is connected to said operating lever intermediate the positions of said pivot and said drill means.

2. A portable drill comprising a frame having wheel means to support a motor driven drill as a mobile unit, the drill being operated by an actuating mechanism through an operating lever pivoted on said frame and extending in a direction opposite from the wheel means relative to said drill, characterized by a pivot for said operating lever positioned on said frame in a vertical plane between said wheel means and said drill, a second pivot on said frame on the opposite side of said drill than said wheel means, a lever pivotally mounted on said second pivot, a link pivotally connected to one end of said lever and at its other end to said drill actuating mechanism to operate therewith, and adjustable stops on said frame to engage the other end of said lever to limit the vertical travel of said drill.

3. A portable drill comprising a frame having wheel means to support a motor driven drill as a mobile unit, the drill being actuated by an operating lever having a pivot on said frame and extending in a direction opposite from the wheel means relative to said drill, characterized by a magnetic clamp means to anchor said frame relative to the work by its connection to said frame between said drill and said wheel means, a pivot for said operating lever positioned on said frame in a vertical plane between said wheel means and said drill, and a pivotal connecting means between said operating lever and said drill connected to said operating lever intermediate the positions of said pivot and said drill means.

4. A portable drill comprising a frame having wheel means to support a motor driven drill as a mobile unit, the drill being actuated by an operating lever pivoted on said frame and extending in a direction opposite from the wheel means relative to said drill, characterized by a pivot for said operating lever positioned on said frame in a vertical plane between said wheel means and said drill, a magnet to anchor said frame relative to the work by its connection to said frame between said drill and wheel means, said operating lever pivot positioned on said frame between said wheel means and said magnet connection, and pivotally connecting means between said operating lever and said drill connected to said operating lever in a vertical plane between said pivot means and said magnet connection.

5. A portable drill comprising a frame having wheel means to support a motor driven drill as a mobile unit, the drill being operated by an actuating mechanism operated by an operating lever pivoted on said frame and extending in a direction opposite from the wheel means relative to said drill, a pivot for said operating lever positioned on said frame in a vertical plane between said wheel means and said drill, pivotally connecting means between said operating lever and said drill in a vertical plane intermediate said frame pivot and said drill means, a second pivot on said frame on the opposite side of said drill than said wheel means, a lever pivotally mounted on said second pivot, a link pivotally connecting one end of said lever and at its other end to said drill actuating 7 8 mechanism to operate therewith, and adjustable stops on 980,100 12/10 Hastings 77-13 said frame to engage the other end of said lever to limit 1,010,975 12/11 Stroner et -al. 77-7 the vertical travel of said drill. 1,763,552 6/30 Cook: 77-7 1,927,005 9/33 G'uibert et a1. 77-7 References Cited by the Examiner W. JR., Primary Examiner.

34 165 10/99 Groneau 77 .TOl-IN C. CHRISTIE, Examiner.

Claims (1)

1. A PORTABLE DRILL COMPRISING A FRAME HAVING WHEEL MEANS TO SUPPORT A MOTOR DRIVEN DRILL AS A MOBILE UNIT, THE DRILL BEING OPERATED BY AN ACTUATING MECHANISM THROUGH AN OPERATING LEVER PIVOTED ON SAID FRAME AND EXTENDING IN A DIRECTION OPPOSITE FROM THE WHEEL MEANS RELATIVE TO SAID DRILL, CHARACTERIZED BY A PIVOT FOR SAID OPERATING LEVER POSITIONED ON SAID FRAME IN A VERTICAL PLANE BETWEEN SAID WHEEL MEANS AND SAID DRILL, AND A PIVOTAL CONNECTING MEANS BETWEEN SAID OPERATING LEVER

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