US1740713A - Fluid-pressure motor - Google Patents

Description

Dec. 24, 1929. T. R. E. RUNDQVIST FLUID PRESSURE MOTOR Filed Dec. 17, 1923 Patented Dec. 24-, 1929 UNETEE STATES hATENT OFFIQE THORE R. E. RUNDQVIST, OF CLABEMONT, NElV HAMPSHIRE, ASSIGNOR TO SULLIVAN MACHINERY COMPANY, A CORPORATION OF I'JIASSACHUSETTS FLUID-PRESSURE MOTOR Application filed December 17, 1923. Serial No. 681,148.

My invention relates to pressure fluid motors.

An object of my invention is to provide an improved pres. ire fluid motor. Another object of my invention is to provide an improved motor of the percussive type whereby the piston strolre may be varied. A further object of my invention is to provide an improved pressure fluid percussive motor espeje cially adapted for drill sharpening purposes whereby the length of the piston stroke may be automatically varied in accordance with the requirements of the work. A still further object of my invention is to provide an is improved motor of the pressure fluid percussive type especially adapted for drill sharpening purposes whereby the point of admission of pressure fluid through the reverse port during the forward stroke of the piston may go be automatically varied in accordance with the requirements of a device actuated thereby.

In the accompanying drawings 1 have shown for purposes of illustration one form which my invention may assume in practice.

as in these drawings,

l is a central longitudinal vertical sectional view through a motor in which illustrative form of my invention is embodied.

Fig. 2 is a view similar to that shown in 3:; Fig. 1 with parts in a diiferent position.

Fig. 3 is central longitudinal vertical sectional view through the front end of the motor, a drill steel being shown in operative sharpening position thereon.

in this illustrative form of my invention I have shown a pressure fluid percussive upsetting motor, generally designated 1, of the valved type comprising a cylinder 2 having a bore 3 in which a piston 4 is reciprocable 4 and adapted to percussively actuate a striking pin 5 carried in the front end of the motor. T iis striking pin transmits its blow to a dolly 6 (see Fig. 3) suitably guided on the front end of the motor and held in oper- 5 ative position thereon by a hinged cover 7 and springs (not shown). Ierein, this dolly 6 is adapted to upset the cutting or bit end a drill steel 8, having a longitudinally 01 extending aperture 9 arran 'ed therein. suitably rigidly clam tered in operative sharpening or upsetting position by means of a suitable pressure fluid operated clamping mechanism (not shown) in a well known manner. Herein, it will be noted that a pinning tool 10 provided with tapered punch portion 11 and an enlarged head 12 is'freely slidably in a bore 13 in the dolly 6 and likewise adapted to be acted on by the striking pin 5 to open the hole 9 in the drill steel, which is frequently obstructed or entirely closed by the swaging operation which sharpens the wings of the bit previous to the upsetting operation. As illustrated, the piston 4 is provided with spaced heads 14 and 15, respectively, which are connected by a reduced portion 16 form ing an annular space 17 in the piston. The opposite ends of the cylinder are closed by suitable head members 18 and 19 which are held in the desired assembled relation by means of side rods (not shown) in the usual manner.

Herein, it will be observed that in order to distribute pressure fluid to and to conduct exhaust fluid away from the ends of the cylinder 2 suitable passages 20 and 21 are provided which lead to points adjacent the opposite ends of the cylinder. The supply and exhaust of fluid which alternately passes through the passages 20 and 21 is controlled by a suitable valve mechanism, generally designated 22, which comprises a casing or chest 23 in which suitable valve bushings 2 1 are so arranged as to form a chamber having stepped bores 25 and 26. As illustrated, the passages 20, 21 communicate with the ends of the intermediate larger bore 26 and terminate in annular grooves 27 and 28 formed in the walls thereof. Herein, near the 'extremitics of the end bores 25, ports 29 and 30 connect reverse or throw passages 31 and 32 with the cylinder at spaced points from the longitudinal center thereof, herein by ports 33 and 34. Annular grooves 35 and 36 are formed in the walls of the valve'chest which communicate by way of ports 37 and 38 with the bores 25 and chambers 39 and 40 respectively which communicate with the atmosphere through said suitable passages, not shown. Herein it will be noted that these chambers also lead to exhaust by way of the reverse passages 31, 32 which are adapted to be alternately connected by means of annular grooves 41 and 42 formed in the piston heads 14, 15 which communicate by way of slots or grooves 43 and 44 with the annular space 17. This annular space communicates with exhaust by means of a port 45 in the cylinder 2 intermediate its ends.

V'Vi'thin the valve chest is a valve, generally designated 46, which is of the multiple spool type, comprising end spools 47 and a central spool 48 which fit the bores 25, 26 respectively, these spools being connected together by reduced portions 49. Herein, the end spools 47 engage buflers or plugs 50 arranged within the ends of the bores 25 in the valve bushingsv 24. A pressure fluid supply communicates with an annular space 51 formed be tween the inner ends of the valve bushings 24 in the central part of the valve chest.

In my improved construction it will be observed that the piston 4 cooperates with mechanism by means of which the admission of pressure fluid through the reverse passage 32 may be automatically varied in accordance with the requirements of the work, that is, when different length pinning tools or dollies are used. Herein, this mechanism comprises a bore 52 extending coaxially through the longitudinal axis of the piston in which a rod 53 is grooved intermediate its ends as at 54, and is arranged and resiliently held against the rear end of the striking pin 5 by means of a spring 55 acting between a threaded plug 56 and an enlarged collar 57 formed on the rod slidably mounted within a bore 58 in the rear cylinder head 18. As illustrated, a plurality of radially extending ports 59 extend between the bore 52 and an annular groove 60 in the rear piston head 14, which is adapted to communicate at certain times with the port 34 leading to the reverse passage 32.

In the operation of my improved mecha nism it will be observed that the drill steel 8 is placed against the steel engaging end of the dolly 6 (see Fig. 3) and is rigidly clamped and centered in that position to be upset or sharpened. The obstruction in the opening 9 in the steel caused by the swaging operation contacts with the punch portion 11 on the pinning tool and causes it to be forced rearwardly as; the steel is placed against the dolly. This causes the striking pin and consequently the piston 4 and the rod 53 tomove rearwardlyto the position shown in Fig. 2. Previous to my invention the port 34 leading to the re,- verse passage 32 was closed by the piston head 14 at this time preventing the valve from being thrown and thereby stalling the motor, but by means of my improved mechanism including the groove 54, passages 59, and groove 60 pressure fluid is admitted to the port 34 and reverse passage 32 thereby reversing the, valve, andmoving the same, to the left (see Fig. 2) consequently reversing the movementor the p ston 4, shortening its stroke but permitting a blow to be delivered to the strikng pin 5. It is obvious that when the piston 1s moved in diflerent positions by the strikduced that will automatically permit a variak tion of the point of admission through the reverse passage thereby varying the reversing of the valve and stroke of the piston. It will further be noted that by means of my invention varying lengths of pinning out tools and strikingpins may be used which automatically vary the stroke of the piston without the possibility of stalling the motor as heretofore experienced. These and other objects and advantages will be clearly apparent to those skilled in the art.

IVhile I have in this application specifically described one form which my invention may assume in practice, it will be understood that this form of the same is shown for purposes of illustration and that the invention may be modified and embodied in various other forms without departing from its spirit or the scope of the appended claims. 1

lVhat I claim as new and desire to secure by Letters Patent is:

1. In a pressure fluid motor, a cylinder, a piston reciprocable therein, piston controlled fluid distribution means for supplying live motive fluid to the opposite ends of said cylinder to effect reciprocation of said piston, an abutment adapted to be actuated by said piston, and means actuated by said abutment for automatically varying the stroke of the piston in accordance with movement of said abutment relative to said cylinder while effective operation of said piston is continued.

2. In a pressure fluid motor, a cylinder, a piston reciprocable therein, piston controlled fluid distribution means for supplying live motive fluid to the opposite ends of said cylinder to effect reciprocation or" said piston, a device adapted to be actuated by said piston, and means cooperating with said piston and engaging said device for automatically varying the stroke of said piston in accordance with the requirements of said device while permitting continued effective operation of the piston.

3. In a pressure fluid percussive motor, a cylinder, a piston re'ciprocable therein, piston controlled fluid distribution means for sup-. plying live motive fluid to the opposite ends of said cylinder to effect reciprocation of said piston, a device adapted to be actuated by in accordance with the position of said device.

5. In a pressure fluid motor, a cylinder, a piston reciprocable therein, piston contro led fluid distribution means for supplying live motive fluid to the opposite ends of said cy inder to effect reciprocation of said piston, a

device adapted to be actuated by said piston for upsetting a drill steel, a pinning out tool for a bore in the drill steel, and means for automatically varying the stroke of said piston in accordance With movement of said pinning out tool relative to said cylinder While permitting continuous effective actu tic-n or" said device by said piston.

6. In a pressure fluid motor, a cylinder, a

- oiston reciprooable therein, valve means for distributing pressure fluid to the opposite ends of said cylinder Whose movements are co rolled by said piston in certain predetermined positions of the latter, a device actuated by said piston and Whose position controls the forward limit of piston movement, and means controlled thereby tor automatially enabling fluid distribution to cause continued eiiective actuation of said device when said device prevents the movement of said piston to that one of said predetermined positions which is next in its cycle of movement.

'" In a pressure fluid motor, a cylinder, a

4. piston rcciproca-ble therein, distribution passages leading to said cylinder, a valve controlling said passages, a device actuated by said piston, and means actuated by said device for varying the stroke of said piston While permitting continued effective operation thereof.

8. In a pressure fluid motor, a cylinder, a piston reciprocable therein, distribution passa -s leading to said cylinder, a valve controning passages, reverse ports controlling the position of said valve tontrolled by id piston, a device actuated by said piston,

and means controlled by said device tor autoinatically varying the point of admission to said reverse ports.

9. In a pressure fluid motor, a cylinder, a piston reciprocable therein, distribution passages leading to said cylinder, avalve con trolling said passages, a device actuated by said piston, and means controlled by said device for automatically varying the timing of movements of said valve during continuous operation of the motor.

10. In a pressure fluid motor, a cylinder, a piston reciproiable therein, distribution pasa L in air i erav.-e ges leadn tos lcylnd a v con s trolling said passages, reverse ports leading from the ends or" said valve to said cylinder and controlled by said piston, a device actuated by said piston, and means for ant matica-lly varying the position of said device for varying the time of admission of pressure fluid to one of said reverse ports during the forward stroke of said piston.

11. In a pressure fluid motor, a cylinder, a piston reciprocable therein, distribution passages leading to said cylinder, a valve controlling said passages, a device actuated by said piston, and means automatically controlled by said device for shortening the stroke of said piston While permitting continuous effective operation of the same.

12. In a pressure fluid motor, a cylinder, a piston reciprocable therein, distribution passages leading to said cylinder, a valve controlling said passages, a device actuated by said piston, and means cooperating with said piston and automatically controlled by said device for shortening the stroke of said piston While permitting continuous effective operation of the same.

13. In a pressure fluid motor, a cylinder, a piston reciprocable therein, distribution passages leading to said cylinder, a valve controlling said passages, a device actuated by said piston, and means cooperating with said piston and automatically controlled by said device for varying the time of admission of pressure fluid to one of said distribution passages While permitting continued effective rcciprocation of said piston.

14. In a pressure fluid motor, a cylinder, a piston reciprocable therein, means for distributing pressure fluid to the opposite sides of said piston from a common source, a member adapted to be actuated by said piston, and means actuated by said member and cooperating with said fluid distribution means for varying the stroke of said piston in accordance ith the position of said member While permitting continuous actuation'of said member.

15. In a pressure fluid motor, a cylinder, a piston reciprocable in said cylinder and having a bore therein, a member adapted to be actuated by said piston, and means actuated by said member con'iprising a shittable member extending Within the bore in said piston for automatically varying the stroke of the latter in accordance with the position of said member.

16. In a pressure fluid motor, a cylinder, a piston reciprocable therein, piston controlled fluid distribution means for supplying live motive fluid to the opposite ends of said cylinder to eflect reciprocation of said piston, an

abutment adapted to be actuated by said piston, and means including a resiliently positioned element extending through the bore of said cylinder and engageable with said abutment and actuated by the latter for varying the stroke of said piston in accordance with the position of said abutment.

17. In a pressure fluid motor, a cylinder, a piston reciprocable therein, a device actuated by said piston, means for distributing fluid to and from said cylinder, a valve controlling said distributing means, means for controlling said valve including a throwing passage, and means automatically Varying with the position of said device for varying the time of admission of pressure fluid to said throwing passage.

18. In a pressure fluid motor, a cylinder, a piston reciprocable therein, means for distributing fluid to and from said cylinder, a valve controlling said distributing means, a reverse port leading from said. cylinder to one end of said valve, a member adapted to be actuated by said piston, and means including an element engageable with said member for varying the point of admission of live pressure fluid from said cylinder to said reverse port in accordance with the position of said mem ber.

19. In a pressure fluid motor, a cylinder, a piston reciprocable therein, means for distributing fluid to and from said cylinder, a valve controlling said distributing means, a reverse port leading from said cylinder to one end of said valve, a member adapted to be actuated by said piston, and means including a resiliently positioned fluid conducting element cooperating with said piston and engageable with said member for varying the point of admission oflive pressure fluid from said cylinder to said reverse port in accordance with the position of said member.

20. In a pressure fluid percussive motor, a cylinder, a piston reciprocable therein, fluid distribution means including distribution passages leading to said cylinder, a valve controlling said passages, reverse ports leading to the opposite ends of said valve and having mouths opening into the bore of said cylinder and arranged to be uncovered by the opposite ends of the piston respectively, a device actuated by the piston, and means automatically controlled by the position of said device for effecting admission of throwing fluid to one of said reverse ports when the mouth thereof is covered by the end of the piston.

21. In a pressure fluid percussive motor, a cylinder, a piston reciprocable in said cylinder, distribution passages leading to the opposite ends of said cylinder, fluid supply and exhaust connect-ions, a valve controlling communication between said fluid supply and exhaust connections and said distribution passages, reverse ports leading to the opposite ends of said valve having mouths opening into the bore of said cylinder and arranged to be uncovered by the opposite ends of the pistion respectively, the reverse port controlled by the rear end of the piston being positioned for uncovering by said end as the piston nears the forward end of the cylinder, a device actuated by the piston, and means automatically controlled by the position of said device for effecting communication between the cylinder bore and said last mentioned reverse port when the rear end of the piston is to the rear of the mouth of said last mentioned reverse port, whereby fluid may be admitted to the forward end of the cylinder to effect reciprocation of the piston with a shortened stroke.

THORE R. E. RUNDQVIST.

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