US1892549A

US1892549A - Rock drill

Info

Publication number: US1892549A
Application number: US333155A
Authority: US
Inventors: Elmer G Gartin
Original assignee: Sullivan Machinery Co
Current assignee: Sullivan Machinery Co
Priority date: 1929-01-17
Filing date: 1929-01-17
Publication date: 1932-12-27
Anticipated expiration: 1949-12-27

Description

E. G. GARTIN Dec. 27, 1-932.

ROCK DRILL Filed Jan. 17. 1929 Iwenfow;

W may a. Z

Patented Dec. 27, 1932 UNITED STATES PATENT OFFICE I ELMEB, G. GAR'IIN, OF ,CLAREMONT, NEW HAMPSHIRE, ASSIGNOR TO SULLIVAN i MACHINERY COMPANY, A CORPORATION OF MASSACHUSETTS w R001: DRILL Applieation flled'l'anuary 17, 1929. Serial No. 333,155.

My invention relates to rock drills, and particularly to power feeding means for rock drills. I I

It is an object of my invention toprovide an, improved rock drill feeding means. A

further object is to provide improved retaining means for holding a pair of telescoping members in relatively fixed position. Still another object is to provide improved rock drill feeding mechanism of the cylinder and piston type having improved means for retaining the cylinder and piston in collapsed position. A more specific object is to provide improved retaining means for holding a feed cylinder and piston in collapsed position wherein there is also provided means for supplying pressure fluid to the total area of the piston for effecting feeding movement when desired. Other objects and advantages of the invention will hereinafter more fully a pear.

In a common type of fluid actuated feeding mechanism for rock drills either the feed piston or feed cylinder is attached to the drilling mechanism and the other element is arranged to telescope freely relative to the drilling mechanism. When the drill is carried from one place to another, it is desirableto retain this freely movable member in fixed relation and preferably retain the same in collapsed position so as to make the machine as short as possible.- In one preferred embodiment m invention assumes the form of a sleeve pro ecting into the feed cylinder attached to the drilling mechanism having passage means through the wall of such sleeve and around the end thereof for admitting pressure fluid directly to the piston around the sleeve. The retaining device per se in a preferred embodiment comprises a spring ring engaging in the bore of the sleeve referred to above.- Obviously, however, this construction may be extensively modified in its details within the purview of my invention.

In the accompanying drawing 1- have shown for purposes of illustration two forms which my invention may assume in practice.

In the drawing,

Fig. 1 is a plan view of a common form of stoper rock drill with which my invention is useful.

Fig. 2 shows a central longitudinal section through a feeding mechanism for a stoper drill having my invention incorporated there- 55.

with in an illustrative embodiment.

Fig. 3 is a fragmentary detail view showing a modification.

Fig. 4 is a detail perspective view of the spring ring retainer.

The drilling mechanism illustrated in'Fig. 1 is of a common type having a hammer mechanism 5 for percussively actuating a drill steel 6 mounted in a suitable chuck 7. The

power operated feeding mechanism for this drill has a cylinder member 8 attached to the drilling mechanism 5 by a plurality of bolts 9 passing through lateral lugs 10 formed integral with the cylinder. Pressure fluid for actuating the percussive drill and the feeding mechanism is supplied through a hose connection 1.1 and suitable throttle valve mechanism 12 controlled'by the operator, with a rotatable handle 13. Supply of fluid to the feed cylinder is further controlled directly by a plunger valve having an operating button indicated at 14. The feed piston is attached to the upper end of a piston rod 15 which at its'lower end carries a pointed abutment 16 and the piston is herein constructed of a plurality of resilient packing washers 17 and 18 mounted between metal washers 19, 20 and 21, these washers being secured in position on the piston rod by means of a suitable retaining nut 22 threaded on a reduced end of the piston rod. One of the packing washers 17 is held expanded against the cylinder by pressure fluid supplied through passages 23 and 24 in the piston rod and passages 25 in washer 20. A sleeve member 26 is fitted into the end of the cylinder bore and has a reduced end 27. A series of holes 28 are bored through this re duced end so that pressure fluid may pass through the sleeve and around the end thereof to act on the feed piston. The packing retainer nut 22 has an annular groove 29 formed therein which receives a spring ring retaining device 30 adapted to engage the internal bore of sleeve 26. In a practical embodiment of the invention the spring ring has an outer surface 31 of spherical contour and holds the feed piston in collapsed position merely by frictional engagement with the bore of sleeve 26. However, if desired, in order to secure a more nearly positive look a groove 32 may be cut into the sleeve, this modification being'illustrated in Fig. 3. The groove is preferably of curved formation to lit the outer surface of the spring ring. The end of sleeve 26 has a beveled or curved surface 33 which is adapted to cooperate with the outer surface of the spring ring when the piston is moved into the cylinder to contract the ring so that it will fit into the sleeve.

The operation and use of my invention will i be readily apparent in view of the above de scription. When it is desired to carry-the drill from one place to another, the fluid is exhausted from the feed cylinder and the feed piston moved into the collapsed position. The spring retaining ring 30 engages the bore of. sleeve 26 and holds the piston inthis position. lVhen the machine is set up ready to drill, pressure fluid is admitted to the feed cylinder under the control of plunger 14 and acts on the total surface of the piston since it is permitted to flow immediately through passages 28 and around-the reduced end of sleeve 26 directly to the piston. This pressure is suflicient to release the retaining device immediately and effect the desired feeding movement.

While I have in this application specifically described two forms which my invention may assume in practice, it will be understood that these forms of the same are 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.

Vi hat I claim as newand desire to secure by Letters Patent is:

1. In a rock drilling apparatus, a rock drill, fluid actuated feeding mechanism therefor comprising telescoping cylinder and piston elements, means forretaining said elements in collapsed position comprising a sleeve projecting into said cylinder, a retaining device carried by said piston for engaging said sleeve to hold the piston and cylinder in collapsed position, and passage means extending latorally through the wall of said sleeve and around the end thereof for supplying fluid to said piston for moving the same thereby to release said retaining means and effect feeding movement.

2. In a fluid actuated feeding mechanism for rock drills, a feed cylinder, a piston and piston rod reciprocable therein, means for retaining said piston and cylinder in collapsed position comprising a reduced extension projecting upwardly from the piston, a sleeve projecting into the cylinder, yielding means carried by said reduced extensionfor frictionally engaging the bore of said sleeve,

and means including radially extending passages in said sleeve for supplying pressure fluid around said yielding means to said piston.

3. A fluid actuated feeding mechanism for rock-drills comprising a feed cylinder, a feed piston and piston rod reciprocable in said cylinder, a sleeve projecting into one end of said cylinder and having a reduced outer end, means carried-by said piston for frictionally engaging said sleeve to hold the cylinder and piston in collapsed relation, and means including passages in said sleeve member forsupplying pressure fluid through the latter and around said reduced end to the piston for moving the same thereby to release said retaining .means and effect feeding movement.

4. Afluid' actuated feeding mechanism for rock drills comprising telescoping cylinder and piston elements, a reduced extension on said piston element projecting beyond the piston,.a sleeve projecting into the end of said cylinder element, a spring ring carried by said reduced extension and'receivable in said sleeve when the cylinder and piston are in collapsed position, said ring frictionally engaging said sleeve to yieldingly hold said piston and cylinder in such position,- and means including passages extending laterally through said sleeve for supplying pressure fluid to the'total area of said piston for moving the same thereby to release said spring ring retainerand eflect feeding movement on supply of pressure fluidto the bore of said sleeve.

5. A fluid actuated feeding mechanism for rock drills comprising telescoping cylinder and piston elements, a reduced extension on said piston element projecting beyond the piston, said piston having an area presenting a surface on which feeding pressure fluid may act to supplement-the action of pressure on the end of said extension, a sleeve projecting into the end of said cylinder element, a spring ring carried by said reduced extension receivable in the bore of said sleeve and bearing against the wall of said sleeve for frictionally holding the piston in fixed relation with the cylinder, and means, operative upon the admission of feeding pressure fluid to the interiorof said. sleeve to act upon the end of said reduced extension, andiwhile said ring still lies within said-sleeve, to conduct feeding pressure fluid distinct from any leakage past said ring, to said surface.

6. A'fluid actuated feeding mechanism for rock drills comprising telescoping cylinder and piston elements, one of said elements having a projecting portion providing a surface upon which pressure fluid may act to provide a feeding pressure,the effective area of such surface being less than the full cross sectional area of the piston, and said element also providing another surface upon which'pres'sure fluid may act to provide a feeding pressure, the effective area of said last mentioned surface being substantially equal to the difference between the full cross sectional area of the piston and the effective area of said projecting portion, the other of said elements having a portion forming a chamber to receive said projecting portion and cooperating, when said portions are in telescoped relation, with the proj ecting portion substantially to partition off one of said surfaces from the other, releasable locking means carried by one of said portions and cooperating with the other when said portions are in telescoped relation to hold said elements in collapsed position and acting to augment the partitioning action aforesaid, feeding pressure fluid supply means operative to supply feeding pressure fluid directly only to one of said surfaces when said portions are in telescoped relation, and means operative upon admission of feeding pressure directly to said last mentioned surface and While said portions are in telescoped relation, to conduct feeding pressure fluid distinct from any leakage past said releasable locking means, to the other of said surfaces.

In testimony whereof I aflix my signature.

ELMER Gr. GARTIN.