US2214666A

US2214666A - Drilling machine

Info

Publication number: US2214666A
Application number: US325012A
Authority: US
Inventors: John E Elf; Cecil E Lucas; Christie Theodore
Original assignee: Individual
Current assignee: Individual
Priority date: 1940-03-20
Filing date: 1940-03-20
Publication date: 1940-09-10
Anticipated expiration: 1957-09-10

Description

Sept. 10, 1940- J. E. ELF ET AL DRILLING MACHINE original Filed Mayes, 1939 SfPt. 10. 1940. y J. E. ELF Er A1. 2,214,666

DRILLING MACHINE Original Filed May 2 9, 1939 2 Sheets,-Sh@ u 2 FIG 5 F'G 6 I E ,LL I I i i3 i l i3 0042/0 (Zr/575'; @y l TTORNEY d Patented Sept. 10, 1940 UNITED STATES PATENT OFFICE DRILLING MACHINE Continuation of application Serial No. 276,264,

May 29, 1939. This application March 20,1940,

Serial No. 325,012

9 Claims.

This invention relates to drilling machines for paper, felt, leather, cloth or other similar sheet material or a combination of such material and the invention has for its principal object to provide a manually operable drilling mechanism for such a drilling machine.

Another object of this invention is to provide the drilling machine with novel operating means for the drill thereof.

Both these and other objects and attendantpadvantages of the invention will become more readily apparent from the detailed description thereof which follows, reference being had to the accompanying drawings in which Figure ll is a side elevation and partial section of the drilling machine.

Figure 2 is a horizontal sectional view taken on the line 2-2 of Figure 1.

Figure 3 is a detail vertical section taken on the line 3 3 of Figure 1.

Figure 4 is a detail vertical section taken on the line 4-4 o Figure 1.

Figure 5 is a front elevation of the drilling mechanism. l n

Figure 6 is an enlarged vertical sectional view of the operating spindle of the machine.

Figure 7 is a detail sectional view of the drill.

and a portion of the spindle to which it is attached.

This application is a continuation of our prior application Serial No. 276,264 filed May 29, 1939. The drilling machine forming the sub-ject matter of the present invention is especially adapted for use in oiiices, small book binderies, in fact for any place of business which requires the perforation of paper or other sheet material in quantities which do not warrant the use of a power driven machine. Hand operated punches are at present used for perforating small numbers of sheets at a time but this at best is a slow and therefore costly way of perforating sheet material. With the present manually operated machine many times the number of sheets which can be collectively punched by hand at a time may be collectively drilled by our hand operated drilling machine at one time.

As illustrated in the gures of the drawings, the drilling machine has a base I which carries in the middle and the rear thereof the upright 2. A pair of

guide rods

3, 3 are spacedly supported in front of the upright and are mounted to slide in the horizontal brackets 4 and 5 which form part of the upright 2 and extend forward thereof. Mounted to move with the guide rods and adjusted to slide thereon isthe spindle carrier 6 which has the spindle sleeve 1 adjustably held clamped therein. For this purpose the spindle carrier 6 is split at the rear and can be drawn together to rigidly clamp the spindle sleeve 1 in place inthe spindle carrier. A hollow spindle 8 is journaled in the sleeve I for the operation of a drill and is operated by the mechanism that will hereinafter be described.

The lower end of the

guide rods

3, 3 carry the pressure plate 9 and surrounding the guide rods between the pressure plate and the under side of the bracket 5 are the expansion springs I0, I0. These springs are adapted to force the pressure plate 9 against the stack of sheets to be drilled so as to hold the sheets compressed while the drilling operation takes place. To release the pressure of the plate 9 on the sheets after each drilling operation, the

guide rods

3, 3 carry the collars I I, I I which engage the top of the spindle carrier 8 for movement thereby in order to raise the guide rods andmove the pressure plates away from the sheets on the upward movement of the spindle after the drilling operation has been completed. The spindle carrier in its normally elevated position illustrated in Figure 5 thus holds the pressure plate `'in a correspondingly elevated position with the springs I0, I0 compressed between it and the bracket 5. y Movement is imparted to the spindle carrier by the biiurcated lever arm I2 which embraces the carrier and is pivotally attached thereto at I3, I3. The ends of the lever arm I2 are pivotally connected to the links I4, I4 which in turn are mounted'to swing at I5, I5 on opposite sides of the upright 2 near vthe bottom thereof. In this way the pivotal connections between the lever arm I2, the upright 2 and the spindle carrier 6 permit the movement of the spindle carrier on the

guide rods

3, 3 and the movement of the guide rods in the brackets 4 and 5 on the operation of the drilling machine by the lever arm. When the lever arm is raised intothe dottedline position illustrated in Figure l, the pivotal connection between it and the links I4,. I4 has been moved past the center line between the pivotal i connection I3 of the lever arm to the carrierland the pivotal mounting I5 of the links on the up.- right 2, and this holds the spindle carrier 6 and i with it the pressure plate 9 in a normally inoperative elevated position with the springs I0, I0 held compressed.

For thedrilling operation the lever arm is lowered so as to permit the expansion of the springs I0, I0 for the downward movement of the

guide rods

3, 3 with the pressure plate 9 on the movean opening in the pressure plate and drill the cap 34 and holds the thrust ball bearing 38 in suitable non-metallic material.

stack of the Asheets in the manner that will hereinafter be described. After the sheets are drilled,, the lever arm l2 is raised to first withdraw the s drill from the perforation it has drilled into the sheets and then raise the pressure plate 8 to `release its pressure from the sheets.

With the spindle in a raised positionqthe stack of sheets is released so that it may be removed or relocated for the next hole to be drilled therethru. To facilitate the movement of the sheets and provide for an accurate positioning thereof relative to the drill, a trayll' is mounted to slide onthe base l in front of the upright 2. This tray is preferably made of sheet metal and is slidably mounted on the rails i9, I9 which are held xed on the baseand are made up of wood or other A guide 28, fastened to the under side of the tray as illustrated in Figure 1, engages between two of the rails i9 so as to guide the tray in a straight line movement on the base. A gauge rod 22 is carried in an elevated position bythe tray so as to move therewith. Gauge

members

23, 23 are movable on this gaugel rod so that they can be adjustably held fixed. thereon by means `of their thumb screw 2Q. Each of the gauge members 23 has an vangular groove 25 in the top thereof to have the Wedge shaped bottom of the locking latch 28 engage thereinto. in the bracket 5 and is vertically movable therein. For its operation the latch is provided with the latch rod 2l which extends upwardly therefrom top of the bracket 5 so as to surround the latch 26 and latch rod 21 in its vertical movement, is a hollow 'cap 38 and in its is provided a spring 3l which operates to move the latch 28 into engagement with a gauge member 23 on the downward movement of the spindle carrier which releases the latch rod from its elevated inoperative position.

The drilling mechanism which is operated by the movement of the lever arm l2 is illustrated in detail in Figures 6 and 7 and compris-es a spindle made up of the non-rotating spindle sleeve l and the rotating hollow spindle 8. The latter is mounted to rotate and is movable endwise in and out of the sleeve 'l and carries the hollow spiral 32. This spiral is threaded thru the nut 33 carried by the sleeve 'l so that when the spindle 8 is forced upward into the sleeve on the downward movement of the spindle carrier,

thespiral 32 and with it the yspindle 8 is rotated. The bottom of the spindle 8 is closed by the place in the bottom of the spindle for the support ofthe coil spring 31 which extends thru the hollow spindle 8,'its'spira1 extension 32 andthe spindle -sleeveextension 38-against-the ball bearing Ml- This locking latch is mounted located in the top of the sleeve extension 38. A cap 39 at the top of the sleeve extension 38 holds the thrust ball bearing d in place therein. Ink

being/forced `thru thesheet material for the drillingmoperation. An upward mov-ement of the lever arm I2 with the drill inl drilling engagement inthe sheet stock causes the nut 33 to rotatethefspiral in the vopposite direction so that while the spring 3l remains compr-essed within the spindle, the drilling operation of the drillcontinues .with thev drill rotating in the opposite direction.l In this wayV one or more movements of the lever arm I2 kwillcauseV the drill i8 *to be rotatively forced into the sheet material until it f is completely'perforated thereby. This operation takes place whether the lever arm isA given its full range of movement or only a -partial movement in either direction.

Tosupplement the action of the springtllffiny forcing the drill thru the sheet material on the rotation thereof, a spring A5I-surroundsther outside ofthe spindle 8 and is interposed between the thrust ball bearing 52 and the washer 53-atv the bottom of the spindle sleeve-1. In this way the spring` 5l is jointly compressedl with the spring 31sothat both springs exert their downward pressure on the spindle' for the drillingoperation during the rotation ofV the drill.

For the rotation of the-drill lI6 bythe spindle; l

the cap 34- atethe bottom thereof is'provided with a threaded tubular extension 4l whichV carries the keys or lugs 82 on the end thereof. The drill I6 has `an enlarged head 43 whichv is slotted 'atthec top to'receive the lugs or keys-42 and the locking sleeve l which surrounds the drill head -is threadedY ontothel extension lll of the cap 34ito hold the drill lockedtothe spindle.

The drill proper comprises a straight hollow shank with an enlarged cutting edge at the bottom thereof. cylindrical outer wall andan inclined or beveled The latter is formed by a shortf inner-wall. The-beveled inner wall gradually re-j duces the opening leading into vthe hollow drill up to the opening d5.l Above this opening-timerV insidediameter ofthe drill is enlarged and-a short f inclined shoulder 48 extends-from the reduced opening l5v to this enlarged inner cylindrical bore i of the drill shank.

Due to the fact that the drillingmechanism is f manually operated, it is imperative that the drill be forced thru the she-ets with a minimum eiTort on the` part of Ythe operator.

This is accom-1 plished by the ldrill because of its enlarged cuttingA j edge whichl perforatesv the sheets with a hol-e larger in diameter than the diameter of the outside of the hollow shank of the drill and thus reduces to a minimumlthe frictionbetween the rotating drill `and the wall of the out holes in thev y sheet stock.` 'Ihe discsorchips cut `from the sheets are forced into thev drill and are gradually,

cupped by the inwardly'tapering wall above-the j cutting edge' until they havelbeen forced pastfthel.`

opening 5in-the drill.: This causes the chipshto'.

formthey -retain withinf-the enlarged hollow drill shank after the chips have been 'forced' thru the i opening 45; ,x' i v Removably threaded into. the vtop of the head 43 of the drill I6 is the'dis'charge tube 54. This tube forms an extension ofthe drill so that the chips may loosely=pass therethru and be discharged from an opening 55 in the side thereof into the chute 56' located at the top of the spindle and fastened to the collar 51 of the cap 39.A In this way the chips are discharged from the drilling machine to one side thereof.

The discharge tube 54 is provided with a knurled end 58 which forms a handle with which the tube may be inserted thru the discharge chute 56 and the spindle and threaded into the top of the drill I6. Various diameter discharge tubes are used to have them correspond with the size drill which is used in the drilling machine in order to efficiently carry off the chips from the drill.

In the base l inline with the drill I6 are superimposed a series of freely rotating fiber washers so, su so that when the drin is forced thru the sheet material its cutting edge may enter the surface of the uppermost of these discs and have the discs rotate therewith to prevent injury to the cutting edge of the drill.

In order to further preserve the cutting edge of the drill, the drilling machine is provided with an adjustable stop for the spindle so that the downward movement of the spindle may be arrested at a point just after the cutting edge of the drill has penetrated the bottom sheet of the material that is being perforated thereby. This stop is located to one side of the cap 34 at the bottom of the spindle and comprises a freely rotating disc 60 which is mounted to rotate on the shank 6l on top of its flange 62. The shank 6I is mounted to vertically slide in the bracket and a knurled nut 63 is threaded on the shank above the bracket 5. A keyway 64 is provided in the side of the shank so that the end of the set screw 65 can engage thereintoand keep it from rotating while the nut 53 is being rotated to cause the shank 6I to either move up or down in the bracket 5. In this way the freely rotating disc 60 may be raised or lowered to serve as a variable stop for the spindle of the drilling machine by having 'it engage the overhanging shoulder of the cap 34 of the spindle and thus stop the downward movement of the spindle at a predetermined point while the disc 60 rotates with the spindle. After the stop has been set in its proper position the set screw 65 is tightened so that the shank cannot be moved in either direction until it is released for a new adjustment.

In order to cushion any contact between the lug 28 of the spindle carrier and the top of the cap 30, a rubber pad 65 surrounds the latch rod 21 on top of the cap.

We claim:

1. In a drilling machine the combination of a longitudinally movable internally threaded spindle sleeve, a spindle movable in and out of one end of said spindle sleeve, a spiral on said hollow spindle in threaded engagement with said spindle sleeve, a spring within said spindle sleeve for compression between them on the movement of the spindle into the spindle sleeve, a drill at the bottom of said spindle, meansfor forcing said spindle into said spindle sleeve to compress said spring and cause the rotation of said spindle with said drill by said spiral in one direction and allow said spindle to be forced out of said spindle sleeve by said spring to cause the rotation ofsaid spindle with said drill in the reverse direction.

2. In a drilling machine the combination as set forth in claim 1 including a spring surrounding said spindle held between said spindle and` said spindle sleeve for simultaneous compression with the spring within said spindle sleeve on the movement of the spindle into the spindle sleeve.

3. In a drilling machine the combination as set forth in claim 1 in which said spindle and said drill are hollow, an ejector tube extending thru said spindle sleeve and said hollow spindle to said drill to guide the chips from said drill thru said hollow spindle and said spindle sleeve.

4. In a drilling machine the combination of an upright, a spindle carrier movable on said upright, an internally threaded spindle sleeve held xed in said spindle carrier, a spindle movable in and out of said spindle sleeve, a spiral carried by said spindle in threaded engagement with said spindle sleeve, a spring held for compression between said spindle sleeve and said spindle, a drill at the bottom of said spindle, a lever arm for movement of said spindle carrier on said upright to move said drill against the material to be drilled and thus cause the spindle to be forced into said spindle sleeve for the rotation of the spindle by said spiral and the compression of said spring between said spindle and the spindle sleeve to cause the pressure of the spring to force the drill against the material during the rotation of the drill by the spindle.

5. In a drilling machine the combination as set forth in claim 4 including a stop member on said upright for engagement by said spindle to limit the endwise movement of said drill by said spindle in one direction, means for adjusting said stop member relative to said spindle.

6. In a drilling machine the combination of a base, an upright on said base, a spindle carrier movable on said upright, an internally threaded spindle sleeve held fixed in said spindle carrier, a hollow spindle movable in and out of said spindle sleeve, a spiral carried by said spindle in threaded engagement with said spindle sleeve, a spring held for compression between said hollow spindle and said spindle sleeve, a hollow drill at the bottom of said hollow spindle, an ejector tube carri-ed by said hollow drill and extending thru said hollow spindle and spindle sleeve to carry off the chips from said drill, and means for moving said spindle carrier tov cause the drill to be moved against the material to be drilled and t`o cause the hollow spindle to be moved in and out of the spindle sleeve for the rotation of the drill by the hollow spindle while said spindle is held compressed between the hollow spindle and spindle sleeve and exerts pressure on the drill.

'7. In a drilling machine the combination as set forth in claim 6 including a chute carried at the top of said spindle sleeve with said ejector tube extending thru said chute said ejector tube leading into said chute for depositing the ychips from said ejector tube in said chute.

8. In a drilling machine the combination as set forth in claim 6 including a supporting tray movable on said base in front of said upright, a gauge member carried by said tray, a latch member movable on said upright and means operated by said spindle carrier for operating said latch member to move into and out of engagement with said gauge member.

9. In a drilling machine the combination of a base, an upright on said base, a spindle movand an outlet in able on saiduprighha drill carried by saifd'spindle, a latch'rod movable on said uprightparallelv to said spindle, a latch carried by said latch rod, means connecting said spindle with said latch V`rod for movement thereby, a supporting tray movable onsaid base in front of said spind1eand