US1007295A - Pneumatic hammer. - Google Patents

Description

V. E. LANE.

PNEUMATIG HAMMER. APPLICATION FILED JUNE 21. 1909.

Patented Oct. 31, 1911.

ATTORNEYS direction of the arrow, and showin VICTOR EDWARD LANE, 0E BERWICK; PENNSYLVANIA.

PNEUMATIC HAMMER.

Specification of Letters Patent.

Patented oct. s1, 1911.

Application led June 21, 1909. Serial No. 503,320.

To all 'whom 'it may concern:

Be it known that I, VICTOR EDWARD LANE, a citizen of the United States, and a resident of Berwick, in the county of Columbia and State of Pennsylvania, have invented a new and Improved Pneumatic Hammer, of which the following is a full, clear, and exact description.

My invention'relates to pneumatic hammers, and has for its object to. provide a detachable nose piece carrying the rivet set, or equivalent tool, and so arranged that the nose piece, 4when removed from the barrel, carries with it the rivet set, while the rivet set is in turn detachable from the nose piece independently of whether the latter be mounted upon the barrel or not.

A further object of the invention is to provide a simple, cheap and eicient means for securing the nose piece to the barrel."

Reference is to be had to the accompanying drawings forming a part of this speci- -fication, in which similar characters of reference indicate corresponding parts in all the figures.

Figure 1 is a substantially central vertical section through the entire animer, and showing the relation of the plunger, the movable sleeve, the barrel, and rivet set and the handle; Fig. 2 is an enlarged cross section on the line 2-2 of Fig. 1, looking in the direction ofthe arrow, and showing how the rivet set is detachably mounted in relation to the nose piece; Fig. 3 is a section upon the line 3--3 of Fig. 1, looking in the how the nose piece is detachably connecte with the bar-rel; Fig. 4 is an enlarged cross section upon the line 4-4 of Fig. 1, looking in the direction of the arrow and showing how the barrel vand the movable sleeve encircled by it are put together; Fig. 5 is an enlarged section substantially upon the line 5-5 of Fig. 1, looking in the direction of the arrow, and showing the spring and parts associated therewith for retracting the air valve to its normal position; and Fig. 6 is a detail showing a portion of the spring band appearing in Fig. 3, and showing a hole through the abutting ends of said band to facilitate the application of a tool for the purpose of loosening and removing the band i and the pins carried by it. Fig. 7 isa detail showing the valve spring and parts associated therewith.

The handle of the hammer is shown at 7,

,At 11 is a nose piece, and supported by the same is a rivet set 12 provided with a stem 47 which extends slidably into the nose piece.

The handle 7 is provided with a groove -13, and pivotally mounted withinl this groove is a lever 14. Slidably mounted within the handle 7 is a valve stem 15 which is engaged by the lever 14. A valve 16 is connected with the Valve stem 15 and thus actuated by movements of the lever 14.

The'handle 7 is provided with an air passage 17 which is connected up with a suitable source of air supply,for the purpose of actuating the hammer. Communicating with the air passage 17 is a valve chamber 18 in which the valve 16 is slidably mounted. A spiral spring 19 engages the valve 16 -and is held in position by a cap 20. This cap is provided with an annular flange 21 having pins 21i projecting inwardly from the same. A boss 22 integral with the handle 7 is of proper size for this cap to fit upon, and is provided with longitudinal grooves 23, which reach and merge into a single annular groove 23a. The boss 22 is further provided with two notches 22a merging into the annular groove 23a. In placing the cap 20 upon the boss 22, the pins 21 carried by the cap lare fitted into the longitudinal grooves 23, and the cap is then pushed"` to the left according to Fig. 1, so that the pins 21El enter the groove 23". The cap isy now given a quarter of a turn, so that the pins pass into the notches 22a. The spiral spring 19 being under compression causes the pins 21a to snap into the notches 22a as soon as the cap is turned as just described for this purpose. The cap 20 is thus effectively locked in position, but is nevertheless so held that t-he operator may at will readily disengage it. This he does by giving it another quarter of a turn, meanwhile pressing upon the cap so as to slightly compress the spring 19. e

The inner sleeve 9 of the barrel is provided with air passages '25 and 25", shown in Figs. 1 and 4. The air passage 25 extends from a hole 26 in this sleeve to a. hole 32 in passes through the holes 36a into the barrel and follows the annular groove 33i in the movable sleeve, passing through the holes 30a and 31a into the interior of the movable sleeve 10 and back of the plunger 34. The pressure of this air starts the plunger upon its down stroke. The air in front of the plunger, having a free exhaust through the holes 3T, 33, 39 and 40, offers no obstruction to the stroke of the plunger. IVhen the plunger has nearly reached the end of its down stroke, the air escapes through the holes 27 in the movable sleeve and into and around the annular groove 28. The air then passes back through the groove 25 and through the holes 32 into the interior of the barrel, back of the movable sleeve 10. The cross section area of this opening, back of the sleeve 10, being larger than the cross section area inside of the movable sleeve 10, the pressure back of the sleeve 10 overcomes the pressure inside of this sleeve and thus shifts the movable sleeve forward a trifle or enough to close the holes 31, 27, 37, 38, 39 and 40, and to bring the holes 36 into registry with the holes 35 and with the annular groove 28a in the movable sleeve 10. The hole 31b is also brought into registry with the annular groove 31 and the holes 30 in the movable sleeve. The forward or down stroke of the movable sleeve opens the hole 32, which allows the air after per forming its mission of moving the sleeve 10 as described, to escape, the air passing out of the hole 32a." The down stroke of the plunger having thus been accomplished and the movable sleeve following directly after and the holes 31a being now closed, the holes 36 and 35 being in registry, the air passes through these holes into the interior of the movable sleeve and in front of the plunger 34. This starts the plunger on its back stroke. The air ahead of the plunger upon this back stroke is exhausted throiugh the holes 30 and the annular groove 31 in the movable sleeve and through the hole 31b in the barrel, these holes being now in registry. The plunger 34 now reaches and closes these openings, whereupon the balance of the air between the plunger and the cap 33 of the movable sleeve 10 forms momentarily a cushion, thus preventing a violent blow between the plunger 34 and the cap 33. The back stroke of the plunger,

however, shifts the movable sleeve 10 back into its first position, as indicated in Fig. 1. The reciprocating movementof theplunger 34 and the movable sleeve 10 continues as above described so long as the air pressure is allowed to enter the hammer. \Vhi1e the up stroke of the plunger is cushioned, the down stroke ends in a dead or solid blow.

The device is so arranged that the back stroke of the plunger 34 is actuated slightly by the action ofthe air. The inner sleeve 9 and the o uter sleeve 8, put together as above described, constitute the barrel of the hammer and this barrel, as is apparent from a the foregoing description, is provided with various air passages 25 which communicate with various air holes.

While. barrels for pneumatic hammers have heretofore been constructed and provided with passages somewhat analogous to the air passages 25, the manufacture of such barrels has been difficult, owing to the labor and expense of boring the air passages in question.

Having thus described my invention, I claim as new and desire to secure by Letters Patent:

1. In a pneumatic hammfer, the combination of a barrel having its end inclined downwardly and outwardly, a nose piece provided with a shoulder inclined downwardly and outwardly with which the end of the barrel engages, the inclined end of the barrel and the inclined shoulder of the nose piece serving to aid in holding the bar# rel and nose piece together, and fastening members for holding said nose piece detachably in position upon said barrel.

2. In a pneumatic hammer, the combination of a. barrel, a nose piece extending into the barrel, a band surrounding the barrel and having inturned endsl sunken into the barrel, an opening being formed in the band at the inturned ends, and pins carried by the band and passing through the barrel into engagement with the nose piece.

In testimbny whereof I have signed my name to this specification in the presence of two subscribing witnesses.

VICTOR EDWARD LANE.

Witnesses ALBERT SPAIDE, D. E. BOGARD.

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