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Publication numberUS907041 A
Publication typeGrant
Publication dateDec 15, 1908
Filing dateDec 13, 1907
Priority dateDec 13, 1907
Publication numberUS 907041 A, US 907041A, US-A-907041, US907041 A, US907041A
InventorsCharles M Hampson
Original AssigneeAlfred P Schmucker, Charles M Hampson
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Motive-fluid-operated rock-drill.
US 907041 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)



Patented Dec. 15, 1908.



Patented Dec. 15, 1908. 3 SHE BTS-SHEET 3 To all'wlwm 'it' may concern:

Il a


CHARLES M. nAiirsou, or DENVER, COLORADO, ASSIGNOR or, oNanlLF-roanrnnn r;

' scnirucKnR, OF DENVER, cotomno,

ndmmrnum-ornna'rnn nocx-niamn.

Specification or met -mm. a umionm Decoinber 1a. 1907. 8cfla1No.406', 812 v 1 Be it known that 1, CHARLES MrHaMr -SON,3. citizen of the United States, residing at the city and county of Denver and State of Colorado, have invented certain new -and useful Improvements in Motive-Fluid-Operated Rock-Drills -and I do declare the fol lowing to,be a full, clear, and exact descrip'-' tion of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters and figures of reference marked thereon, which form specification.

My inventionrelates toim roveinents in motive fluid-actuatedrock d" ls. a More specifically the'invention relates to a, part of this a construction for rotating the drill steel bythemotive fluid .agent which operates the I hammer'whiclh acts'on thedrill steel.

In my improved construction a disk is mounted adjacent the. drillsteel-holding chuck and carries spring-actuated pawls adapted to act on a ratchet face with which the adjacent extremity of the chuck is provided. This. pawl-holding disk is adapted;- -to have an' alternating or back and forth movement within a ring which isstationary .within the drill casing." This disk is providedwith two shoulders of different area. The construction is such thatthe motivefluidwhich operates the'hammer acts constantly upon the shoulder of smaller area and intermittentlyupon the shoulder of lar erarea. The intermittent action of the fluid upon the shoulder or surface of larger area is controlled by the actionof the hammer, and the motive fluid is only allowed to act on the larger area when the hammer is at or approximately at its rearwardclimit of movement The constant. pressure onthesmaller area has a tendency to maintain thepawl holder in one position, but as, soon as I the motive fluid is admitted to the surface of larger area, the pawlhold'e'r is-moved in 1 the'opposite direction. A InIthis'way an alter? nating'i or rotary reciprocating ginovement .is' produced. :When the pawl holder? moves in one direction, the-pawls'act upon'theratchet face tosim art-tothe chuck iind'f th'e drill steel carrie, thereby, a partialfrotary move-j ment inone direction. i When, however, the pawl holder moves in the opposite direction esP ng-h 1 aw s' l p e h face struction, '1; will'zproceed to describe the same in detail reference being'made to the mountedto reciprocate in a chamber- 7. The

the" ratchet without imparting any movement.- In this way an intermittent rotationof fthe drill steel is 'broughtabout by the motive fluid agent'the same-being controlled bythe-action of the hammer which operates as a; valve both-to control its own action, as- Well' as the reciprocating-actionof thepawl holder;v Y

Having briefly outlined my improved conaccompanying drawing inwhich is illus trated an embodiment thereof. I

In thisdrawing, Figure 1-is a longitudinal section taken through a "hammer drill equipped with my improvements. Fig. 2is" a fragmentary view of the same shown on a larger scale. This may be considered asec- 4 is a section takenon thejline Fig. 2- looking in the direction'of arrow 4 Fig.

line 6-,6 of Fig. '5. v

The same reference charactersindicate'the same parts in allgthe views.

thedrill in whichislocated a'ha'mmer 6 rear pagrt of the-casing is closed-by a plu 8 provided with a;yielding its rearward limit of movement. .In the 10 for controlling the introductionn-Ofmo ter with a passage 13 :in the plug This passage leads to'a. circumferential groove 14 what reduce in size as shown at 17 to fit' the ber. 19 of thehammer, the. latter being hol low. 1 As asthe motive fluid enters ;the chamber: 19,.1t 'also passes -to" the ch-amber 7- ' a section taken onthe line 5-5 Fig. 2.

Fig. 6 ,is a longitudinal section taken-on these ,Let the: numeral 5 designate the casing of l buffer 9 withwhich the hammer comes in contact when at i-rearlpart of thepIugiS'is inserted a valve .tive fluid to .thedrill; This valveispro-g vided with an opening "12 adapted to regis-"' communicating with the "chamberq. 'Forvward of the. 0'11: 16, the chamber'7 is some- 10.5 hammer and communicating with a chain- As soon as the hammer reaches its forward limit of movement the motive fluid exhaust through the ports 18 into a space 20 formed in the drill casing and communicating with an exhaust port 21. The motive fluid then acts on a shoulder 22 of comparatively small.

- surface area, to give the hammer the return movement. The pressure of the live fluid is constant upon the shoulder 22 but as its area is exceedingly small as compared with the surface upon which the live-fluid acts as soon as it enters the chamber 19 of w the hammer, the latter is driven forwardly wlth great force, the resistance oflered by the action of the live fluid upon the shoulder 22 being insignificant.

Nothing 1s claimed on the mechanism just described in detail, as it has been chosen as a simple form of construction'to which'my by holding the latter securely in place. The

forward extremity of the chuck is threaded and a nut 28 is screwed thereon to engage ment with the sleeve 25. The rear extremity of the screw sleeve 25, engages a disk 29 which closes the forward extremity of a cir-' cumferential chamber 4 formed in the forward part of the drill: casing and in which is located a pawl holder 30 -adapted to have a limited rotary movementin reverse direc tions. Adisk 3- is located in. the ,rear extremity of this chamber. The; ring-5135B located between the disks 3 and .29 and-the screw sleeve 25 locks'these parts securely in place. The ring 35 serves as a spacerto prevent the pawl holder from being clamped between the disks. Thetwo disks 3 and 29,

surround a sleeve 2 through which the drill steel passes. The rearv extremity of the sleeve 2 engages a rubber buffer A which surrounds the rear extremity of the drill.

steel. The pawl holder is cut away on one side. forming a chamber 31 in which is located a lug 32 of less siz'ethan the chamber,

thus allowing the pawl holder a limited movement. This action is suflicient-for im', parting) astep by step rotarynction to the chuck virtue of the engageineritofpawls 33 with ratchet teeth 34 formed on the rear extremity of the chuck.- .The lug 32 is,

formed on a ring 35 fast in the drill casing and surrounding the pawl holder.

The rear portion of the casing 5 is provided with a port 36 communicating with a forwardly extending passage 37 which registers with a passage 38 formed in the lug as soon as the hammer passes to the forward 32. This lug is also provided-with a port 39 for the escape of motive fluid into the chamcut off from the chamber 7.

ber 31, whereby the pawl holder is actuated in one direction. The entrance of air or motive fluid to the chamber 31 is intermittentsince it only has access to said chamber when "the live motive fluid is in the chamber 7 of 'thecasing and acting on the hammer. As soon as the ports 18 of the hammer pass forward of the port 16, the live motive fluid is lVhen this occurs, provision must be made for imparting to the pawl holder the reverse vmovement.

From the passage 15, a small passage 40.

leads forwardly and registers with a passage 41 formed in the ring. 35. This ring is also provided with a port 42 leading from said passage, whereby the motive fluid acts on a shoulder 43 ofthe pawl holder, the said shoulder being ,ofre-latively small surface area. rere d-m ntras motive fluid on the shoulder 'or face43 is constant. Hence as soon as the motivefluidiscut oflf from the chamber. 31, the constant {pressure on the relatively small surface of th e'r shoulder 43, imparts to the pawl holder the reverse movement. The shoulder 43 of the pawl holder when in the position shownin Fig. 5, acts upon a relatively small projection 45 which enters a recess 46 formed the pawl holder. This recess is of the same length as the chamber 31 and makes room for the projection 45 during theback and forth movement of the pawl holder in the performance of its function. The pawls 33 are inserted in recesses formed in the pawl holder and are acted on by coil springs 44 which hold them in engagement with the ratchet teeth 34. When the pawl holder makes the reverse move ment, theforward extremities of the pawls slip over the ratchet teeth 34 without moving the chuck.

From the foregoing description the use and operation-of my improvement will be readily understood. hammer is at its forward limit of movement as shown in Fig. 1, the live motivefluid acting on the shoulder 22 of. the hammer imparts to the latter its reverse or rearward movement. rear extremityof the chamber 7, its ports 18 are brought into communication with the port 16 of the casing, allowing the motive fluid to enter the chamber 7 and act upon the hammer to impart a forward movement whereby it is caused to strike the drill steel. As soon as the motive fluid enters the chamber 7, a relatively small part of it escapes through the port 36, and the passages 37 38 and the port 39, to the chamber 31, imparting to the pawl holder 30 a partial'rotary movement in such a direction that thepawls 33 act on the 'ratchet teeth 34 of the chuck to impart to the latter together with the drill steel a corresponding movement. Again position whereby the motive fluid in the Assuming that the,

Before the hammer reaches the chamber 7 exhausts throu h the port 21, the constant pressure oi the we fluid u on the shoulder as of the rotary pawl hol er, imparts to the latter the reverse movement wherebythe pawls. sli over the teeth 34 without actuating the c uck.

Having thus described my invention, what I claim is:

The comhinationwith a casing and a drill,

of a motive fluid-controlled hammer piston;

for striking the latter, a drill chuck provided with a ratchet formed on the face of its inner extremity, a pawl-ho1der mounted to have an alternating rotary movement for rotating the chuck, pawls carried by the said holder, occupying positions parallel with its axis, and mounted to reciprocate in recesses with which the holder is "provided, the said pawl holder having difierential surface areas, the casing being provided with means for constantly admitting the motive fluid to the smaller surface area of the said holder,

and also withmeans for intermittently ad- CHARLES M. HAMPSON. Witnesses: f i


Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2457969 *Mar 28, 1947Jan 4, 1949Ingersoll Rand CoRotation device for rock drills
US5417294 *Mar 15, 1994May 23, 1995American Pneumatic TechnologiesPneumatic hammer
International ClassificationE21B1/30
Cooperative ClassificationE21B6/00