US2173817A

US2173817A - Hydraulic drive mechanism

Info

Publication number: US2173817A
Application number: US180818A
Authority: US
Inventors: Barney Freeman
Original assignee: Challenge Machinery Co
Current assignee: Challenge Machinery Co
Priority date: 1937-12-20
Filing date: 1937-12-20
Publication date: 1939-09-26
Anticipated expiration: 1956-09-26

Description

Sept. 2 6, 1939. F. BARNEY HYDRAumc DRIVE MrscmuusmA Filed Dec. 20, 195'? 3 Sheets-Sheet 1 Sept. 26, 1939. F. BARNEY 2,`173,817

HYDRAULIC DRIVE MECHANISM Filed Dec. 20, 1937 3 Sheets-.Sheet 5 A f l l 'Humm @sa m.

Patented Sept. 26, 1939 UNITED STATES PATENT OFFICE The ChallengeA Machinery Uompany, `Grand Haven, Mich., a corporation of Michigan Application December 20, 1937, Serial No. 180,818

9 Claims.

This invention relates to paper drilling machines and is concerned with a novel hydraulically operated mechanism fory moving a paper drill,

downwardly into drilling relation with the paper which it is to drill, the controlv of such mechanism being through a manually operated instrumentality, sucli as a foot pedal or an equivalent thereof, whereby the pressure required to force the drill downwardly through the paper which is mon heretofore; for the operator to supply the force or pressure to the drill.

The invention is concerned with novel co structions, combinations and operative arrangements of parts to eiectively attain the` power feed` of the drill to the paper. In addition many other objects and purposes will appeal, among which is a`regulation of the speed of the drilling 20. movement with relation to the paper which is drilled, and an automatic stopping of the drilling feed and return of the drill to initial positionwhen a paper drilling operation is completed, or to stop the drill lat any point in its downward course by releasing the pressure on foot pedal 42. The drill will then return to initial position automatically, all of which may be understood from the following description, taken in connection with the accompanying drawings, in which:

machine to which my invention is applied.

Fig, 2 is a fragmentary side elevation of the hydraulic mechanism which is mounted in the lower part of an enclosing cabinet, said cabinet 'being shown in vertical section. A

Fig. 3 is a fragmentary longitudinal vertical section through the hydraulic mechanism shown in Fig. 2.

Fig. 4 is a horizontal sectiontherethrough.

Fig. 5 is a fragmentary side elevation, similar to Fig. 2, showing the parts of the machine in a different position, and

Fig. 6 `is an enlarged partial elevation an 55 is carried on andabove a cabinet or` casing 4 /drilled is readily and easily applied and con- 4 trolled and it is not necessary, as has been comf Fig. 1 is a side elevation of a paper drilling within which the hydraulic mechanism for feeding the drill downwardly is housed. y

In the construction of the 'drilling machine two vertical posts 5 are mounted to extend through the support 3 and into thel cabinet'4, said posts 5 being normally held in an upper position by coiled compression springs 6 which are compressed on downward movement of the posts during the drilling operation. A head 1 is adjustably mounted by means of split sleeves 8 which may be 10 clamped on the posts 5 at any position to which adjusted. I'I'his head carries an electric motor 9 which through a belt indicated in dotted lines at III drives a vertically positioned rotatable spindle II, at the lower end of which the paper drill I2 l5 is detachably connected. The drill is a hollow drill and is positioned with reference to the back gauge 2 so that it will come a short distance in front of the face of the gauge against which the paper engages.I lIn practice the back gauge is 20 adjustable to different positions on the table I to controlthe distance that the holes .drilled in the paper are from the back edges of the sheets of paper.

The posts 5 are connected 'at their lower end by 25 a cross bar I3 which, at one end, has a short extension I4 (Fig. 4). I A vertical rod I5 is' threaded through the extension I4 and may be locked by the lcknutv shown in any position to which it may be adjusted. The cross bar -I3'lies 30 above the inner end of an oil containing tank I5, the inner chamber I'I of which is partly lled with oil to provide a reservoir of oil for the hydraulic operation which will be later described.

The tank has an open upper end covered by a 35 removable cover. At its rear portion a vertical cylinder AI8 is cast integral withthe tank I6, the I upper end' being closed by a closing head I9 in which a suitable stuffing box is installed and through which a piston rod passes, having a 40 piston 2I at its lower end within the cylinder I8, and at its upper end having a connection to the bar I3 substantially midway between the posts 5.

A rotary pump 22 is mounted to one side and adjacent the front of the' tank IB and has an 45 inlet conduit 23 connecting its intake side with y/the tank IIi adjacent the bottom of said tank (Fig. 3). From the outlet side of the pump a conduit 24 leads to the upper end portion of the cylinder I8, emptying as at 25 (Fig. 3), into said cylinder 50 above the piston 2I. Likewise', above the piston and connected with the cylinder I8 is a nipple 26 connected with a relief valve 21 which is `.connected by a suitable nipple with a coupling 28. The outer end of the coupling has a valve member 29 of substantially cylindrical form connected therewith and extending outwardly therefrom, to the end of which is an outlet 30 having a central passage therethrough.

The valve member 29 between its ends is provided with a transverse partition 3|. At one side of the partition toward the coupling 28 holes V32 are made through the wall of the valve member, and similar holes 33 are made through said walls at the opposite side of the partition 3| (Fig. 6). Surrounding the valve member 29 is a housing made up of two

sleeves

34 and 35 one threading into` the other, said sleeves having inturned annular flanges at their outer ends so that the body of the housing made by the connected sleeves is spaced from the outer sides of the valve member 29. Within the housing at each end thereof so as to bear against said annular flanges are packing

rings

36 and 31, which are held against said anges by a coiled compression spring 38 between the packing rings. Trunnions 39 are connected with the member 34 and extend in opposite directions therefrom. A relatively heavy coiled compression spring 40 at one end bears against the endof the member 34 tending 'to push it and the connected member to the left (Fig. 6), the opposite end of the spring bearing against an annular collar of the coupling 28.

A lever 4| having a foot pedal 42 at its outer end, said pedal being located at the front of the cabinet 4 and near the bottom thereof, is pivotally mounted at its inner end toturn about a pivot rod 43. On such pivotal movement of the pedal in a downward direction it swings the upwardly extending arm 44 in a counterclockwise direction. A square block 45 (Fig. 5) is carried at the upper end of the arm 44. A coiled spring 46 associated with the arm and the pedal 4| normally tends to lift the pedal to the upper position shown in Figs. 1 and 2.

A shaft 41 extends through the tank I 6 and is journaled for rotative movement in the sides of the tank. Within the tank arms 48 secured to the shaft extend upwardly and at their upper end portions are recessed or slotted to receive the trunnions 39 (Fig. 5). At the outer end of the shaft 41 and between the tank I6 and a side of the cabinet 4 an arm 49 is secured extending downwardly and at its lower end having a pivotal connection to the rear end of a bar 50. The ba-r 50 extends in a forward direction over the block 45 previously described. Said bar 50 in front of the block 45 is provided with a hardened block 5| at its underside against which the block 45 engages on depressing the pedal 42; thereby moving the bar 50 longitudinally in a forward direction, turning the shaft 41 and moving the valve housing comprised of the

parts

34 and 35 rearwardly or to the right (Fig. 6), whereupon the packing at 36 covers the openings 33.

The pump 22 is driven by an electric motor 52 which through a series of belts 53 and reducing pulleys 54 drives the pump at a less speed than the speed of rotation of the motor.

A lever 55 is pivotally mounted at 56 between its ends on a side of the tank I6, the rear end of the lever extending to and coming directly beneath the lower end of the vertical rod I5. 'Ihe front end of said lever extends alongside the bar 50 to a position in frontl of the block 5| and has a lateral projection 51 which comes underneath the front free end of said bar 50 (Figs. 4 and 5).

When the machine is to be usedfor drilling paper, the sheets of paper to be drilled usually in a superimposed pack are placed on the table I and against the back gauge 2; and usually an end gauge, not shown in the present disclosure, is used to gauge the sheets at one of the side edges thereof. Preparatory to drilling the electric motor 52 is started in operation. It pumps oil, taking it from the chamber I1 of the tank I6 throughvthe inlet pipe 23, and delivers it to the cylinder I8 above the piston. So long as the pedal 42 is not depressed the oil pumped into the piston is carried out through the nipple 26, through valve 21, coupling 28 and into the valve member 29, passing outwardly through the openings 32 and then back into the valve member through the openings 33 and out at the outlet 30.

When the pedal 42 is depressed and the packing at 36 covers the openings at 33 in the valve member 29, there is no place for the oil to go except into the cylinder I8, whereupon the oil pumped into the cylinder above the piston `2| causes a pressure upon the upper side of the piston, moving it downward and thereupon bringing the drill I2 into drilling relation with the paper. The downward movement of the piston 2| continues, so long as oil isy pumped into the cylinder I8 above the piston and cannot escape until the lower end of the rod I5 engages the lever 55 and turns it in a clockwise direction. Such movement elevates the `projection 51 with a consequent elevation of the outer end of the bar 50 and disengagement of the block 5I from the-block 45. When this occurs the spring 40 moves the outer housing consisting of

parts

34 and 35 back to the initial position shown in Fig. 6. This restores the circulation of oil through the

openings

32 and 33. The springs 6 elevate. the posts 5 and the drill I2 and force the oil which is above the piston outwardly and into the tank I6, as is` evident. 'Ihe valve control of the flow of oll through the openings 33 is operated substantially instantaneously so that when the drill has completed a drilling operation and reached the lower limit of the travel which it should make it is stopped substantially instantly and started on its return to upper position as the rod I5 operates vthe lever 55 and stops any further downward movement of the piston 2|.

The speed of downward movement of the piston Y 2|, posts 5 and the drill may be regulated by setting the relief valve at 21. Such relief valve is of conventional structure. It may be set to permit a limited escape of oil, but not the f-ull amount that is pumped into the cylinder I8. Such valve is accessible by removing the cover to the tank I5, whereupon the relief valve may be set for the desired downward drilling movement of the drill andthen the cover replaced. After the downward movement of the drill has been stopped and it is returned to its upper position, it is necessary to release the foot pedal to permit the block 45 to again come in front of the block 5I for the succeeding drilling operation.

With this structure the power moving the drill downwardly to and through the paper is supplied by the electric motor 52. The operator is not re- ,quired to overcome the elevating springs 6 and force the drill downwardly through the paper as has been common practice in many machines heretofore. The operators use of the pedal is more in the nature of a trip to start the hydraulic mechanism in motion thereby relieving him of the strain to which he was previously subjected. Speed of drilling and ease of operation is greatly enhanced.

One very desirable and important feature of the operation of the present invention is that the movement of the drill in drilling through the paper may be stopped and automatically returned to initial positon at any time by releasing pressure on the pedal 42. On release of such pressure Vthe forcing of oil into the cylinder I8 above the part of the machine, if the operator is injured,

if there is a breakage, and the like.

It is further to be understood that while the Y practical embodiment of this invention as disclosed in the drawings shows a vertical machine and that at the present time is the best construetion that I know for embodying the invention, such invention is not to be limited necessarily to vertical movements of the drill as it may be used equally as well on horizontal machines.

The invention is dened in the appended claims and is to be considered comprehensive of all forms of structure coming within their scope.

I claim:

l. In a paper drilling machine, a support, a vertically positioned drill carrying member movably mounted on said support for vertical movements, yielding means normally lifting said drill carrying member to an upper position, a receptacle having a liquid receiving chamber therein, a vertical cylinder located in said receptacle, a piston in said cylinder, connections between said piston and the lower end of the drill carrying member, a pump, an inlet liquid conduit lfrom the chamber in said receptacle to the inlet side of the pump, an outlet conduit from the outlet side of the pump to the upper part of said cylinder above said piston, a third conduit from the upper part of said cylinder and above the piston to said receptacle, a normally open valve in said third conduit, and pedal operated means for closing said valve, as and for the purposes speciied.

2. In combination, a horizontal table upon which paper to be drilled is adapted to be placed, a vertically positioned rotatable paper drill above said table, vertically movable means carrying said drill, means normally acting to lift said vertically movable means and drill to an upper position, hydraulic means including a continuously operating pump for pumping liquid, a cylinder, a piston therein above which liquid is pumped into said cylinder, a connection between said piston and said vertically movable drill carrying means, a conduit between said pump and said cylinder, free outlet means for said liquid, and manually operable means for arresting the ilow of liquid through said outlet means and forcing it against said piston to cause a movement thereof said manually operable means being operable at any mid-position of said drill to release the ilow of liquid and, to thereby reverse the movement of said drillifrom such position.

3. A construction containing the elements in combination defined in claim 1, combined with a vertical rod connected to and extending in a downward direction from said drill carrying member, a lever mounted between its ends for pivotal movement on said receptacle, one end of said lever lying directly below the lower end of said rod, whereby said lever is pivotally moved on downward movement oi the drill carrying memberA to a predetermined position, and' means carried by said lever for vfreeing said valve in the third conduit whereby it may move to open position.

4. A paper drilling machine including, a support, a drill carrying member mounted on said support for vertical movements, means for elevating the drill carrying member to an upper position, a receptacle adapted to hold a quantity of liquid, a vertical cylinder in said receptacle, a piston in the cylinder, connections between said piston and the drill carrying member for moving said member with the piston, a pump, means to drive the pump, an inlet conduit leading from said vreceptacle to the inlet side of the pump, an outlet conduit leading from,the outlet side of the pump to the upper part of the cylinder and above the piston, a third conduit leading from the upper part of the piston into said receptacle, a spring actuatedyalve normally held in an open position in said conduit, foot operated means for moving said valve to closed position, and means operated by the drill carrying member when it has reached a predetermined lower position for disengaging said valve from said foot operated means to permit the spring of the spring actuated valve to return the valve to open position.

5. In a paper drilling machine, a support, a drill carrying member mounted on said support for vertical movements, means for elevating said drill carrying member to upper position, a receptacle for containing a quantity of liquid, a vertical cylinder in said receptacle, a piston in the cylinder, a piston rod connecting the piston with said drill carrying member, a pump, means for driving' said pump, an inlet conduit-leading from said receptacle to the ,inlet side of the pump, a second conduit leading from the outlet side of the pump to the upper part of said-cylinder and above the piston, a third conduit within said receptacle extending from the upper portion of said cylinder and above the piston, a spring actuated valve in said third conduit, said valve being normally held by its spring in open position, a foot pedal, re-

leasable connections between said pedal and said valve, a depression of said foot pedal moving the valve to closed position, a lever mounted between its ends on one side of the receptacle, a rod mounted on said drill carrying member adapted to engage the lever at one side of its pivot to turn the same when the drill carrying member has been moved downwardly to a predetermined position, and means on the other end of the lever engageable with said releasable means for actuating the same and disconnecting the valve from said pedal, as specied.

6. A paper drilling machine including, a support, a. drill carrying member movably mounted thereon for vertical movements, spring means normally elevating said drill carrying member to an upper position, a receptacle adapted to` contain a quantity of liquid, a vertical cylinder in said receptacle, a piston in the cylinder, a piston rod connection between the cylinder and the drill carrying member, a pump, means to drive the pump, a conduit connecting said receptacle and the inlet side of the pump, a second conduit connecting the upper part of said cylinder at a point above the piston with the outlet side of the pump,

. a third conduit connected with the upper part of thecylinder above the piston located in and emptying into said receptacle, a spring actuatedv valve slidably mounted on said third conduit, in-

open position, a rockv shaft, connections between the rock shaft and valve for moving the valve against said spring to closed position, an arm on the rock shaft, a bar connected to said arm hav- I ing a shoulder at its under edge and toward its move said valve to closed position, as and for the purposes described.

7. A construction containing the elements in combination dei-ined in claim 6, combined with a lever pivotally mounted between its ends on said receptacle, a member attached to said drill carrying member and movable therewith adapted to engage the lever at one side of its pivot on downward movement of the drill carrying member to a predetermined lower position and a lateral prof. jection carried by said lever at the other side i' its pivot extendingunder said bar, whereby said bar is lifted on pivotal movement of the lever to free said valve for return to closed position.

8. In combination, a member against which paper to-be drilled may be placed, a rotatable paper drill, movable means for carrying said drill toward vand away from said member, yielding means normally acting to move said drill carrying means away from said member, hydraulic means including a cylinder, a piston therein, and a pump for pumping iiuid, a connection between the piston and the movable drill carrying means, aconduit between said pump and said cylinder, free outlet means for said iiuid, and manually operable means for stopping the flow of iluid through said outlet means and forcing it against said piston to thereby move the piston and connected drill carrying means.

9. In a paper drilling machine, a support, a drill carrying member movably mounted on said support for vertical movements, means normally elevating said drill carrying member to an upper position, a cylinder, a piston therein, a piston rod connecting said piston and said drill carrying member, a pump, a receptacle for holding liquid, a conduit leading from said receptacle to the pump, from the pump to one end of the cylinder, andv from said cylinder to said receptacle, said conduit normally being open for ilow of liquid, manually operable means for closing said conduit between the receptacle and cylinder to force the liquid into the cylinder against a side of said piston to thereby move the attached drill carrying apparatus in a downward direction, means mounted on said drill carrying apparatus and moving therewith in a downward direction, and means operated thereby for automatically opening said conduit when the drill carrying apparatus has moved in a downward direction to a predetermined position.

FREEMAN BARNEY.