US1372348A

US1372348A - Pneumatic hammer

Info

Publication number: US1372348A
Application number: US114948A
Authority: US
Inventors: Charles H Haeseler
Original assignee: Individual
Current assignee: Individual
Priority date: 1916-08-15
Filing date: 1916-08-15
Publication date: 1921-03-22
Anticipated expiration: 1938-03-22

Description

C. H. HAESELER PNEUMATIC HAMMER.

APPLICATION FILED AUG.15,19I6.

Patented Mar. 22, 1921.

INVENTOR WITNESSES ATTORNEYS ares . TENT OFFICE.

CHARLES H. HAESELER, OF CHICAGO, ILLINOIS.

PNEUMATIC HAMMER.

Application filed August 15, 1916. Serial no. 114,948.

inder. In view of these numerous accidents,

which have arisen from this cause, many' of the States in this country have passed laws rendering it compulsory in devices of this character to employ some means to prevent the accidental discharge of the iston from the cylinder or barrel of the too The cost of operation is also increased, since the piston is sometimes injured and in many cases, such as structural operation and bridge building, the working tool or piston or both are lost and it is necessary to replace them.

It is therefore "also desirable to employ means to prevent the piston and also the working tool, such as for example a rivet set, from being forcibly ejected from the cylinder, and to the above ends, my present invention consists of novel means for preventing the accidental removalof the rivet set and the piston from the barrel of the working tool.

It further consists of novel means for retaining-the working tool in assembled position,'whereby it maybe readily inserted and removed when desired, and wherein if the pneumatic tool is not held to its work, the shank of the rivet set will be moved forwardly a suflicientdistance to be out of the path of the piston, so that the latter cannot impact th'ereagainst.

It further consists of a novel construction I of a coupling sleeve by which the working tool is movably carried, and novel means for securin to the tool.

It further consists of a novel constructlon of a working tool and novel means cooperating therewith, whereby the accldental removal of the working tool from the coupling sleeve is prevented.

It further consists of a novel construction of a coupling sleeve adapted to be removably connected with the barrel of the tool and such coupling sleeve with respect arrel or cylin er of the pneumatic em loyed.

having a chamber in advance of the forward end of the barrel in which is adapted to reciprocate a split ring which is interlocked with the shank of the working tool.

Other novel features of construction and advantage will hereinafter more clearly appear in the detaileddescription.

For the purpose of illustrating my invention, I have shown in' the accompanying drawin s one form thereof which is at pres: ent preferred by me, since the same will give in practice satisfactory and reliable results, although it is to be understood that the variousinstrumentalities of which my invention consists can be variously arranged and organlzed and that my invention is not limited to the precise arrangement and organization of these instrumentalities as herein shown and described.

Figure 1 represents a-side elevation, partly in section, of a pneumatic tool in conjunct1on with which a retaining device for the working tool, embodying myinvention, is

1* 1g. 2 represents a sectlonal View, the section being taken on line 2-2 of Fig. 1.

Fig. 3 represents a sectional view, the section being taken on line 33 of Fig. 1.

Similar numerals of reference indicate corresponding parts in the figures.

Referring to the drawings 1 designates a pneumatic tool of any desired or conventional type, which is provided with a barrel 2 having a piston chamher 3 in which is adapted to reciprocate a piston 4. The piston 4 consists, in the present instance, of a cylindrical bolt having a forward extension or striker 5 of reduced diameter which is adapted to pass through an aperture 6 in the barrel to impart its blows against the end of the shank 7 of a working tool 8, which for purpose of illustration is illustrated as comprising a rivet set.

The aperture 6 is of less diameter than the piston chamber 3, thereby forming a shoulder 9, sothat the piston 4 cannot be ejected from the front end of the barrel, but only from the rear end of the barrel after the handle 10 has been removed. The piston 4 is reciprocated in the usual manner by alternately passing motive fluid, such as for example, compressed air, to opposite ends of thepiston 4 to effect its rec-iprocations.

. The forward end of the barrel 2, in the present instance, is of reduced diameter, as indicated at 11, in order to receive the rearward extension 12 of a coupling sleeve 13. the outer diameter of which is preferably the same as that of the barrel 2. The coupling sleeve 13 is provided with an intermediate portion 14 of less internal diam eter than. the chamber of the rearward extension 12 and theforward end of the coupling sleeve has a solid portion 15, which is apertured as at 16, in order to receive the shank 7 which fits therein and also in a recess 17 in the end of the barrel 2, said recess 17 communicating with the aperture 6.

The shank 7 of the working tool is provided with means to interlock with a split ring 18 and in order to illustrate one manner of accomplishing this result, I have. shown the shank 7 as provided with an annular groove 19 to receive such split ring. The differential bore of the coupling sleeve 13 forms a shoulder 20 against which the end of the barrel 2 preferably engages and when the parts are assembled, a chamber 21 is formed in which the split ring 18 may reciprocate.

22 designates fastening devices, such as for. example, screws which extend through the rearward extension 12 of the coupling sleeve 13 and which are in threaded engagement with the barrel 2, as will be readily apparent from an inspection of Fig. 2.

28 designates a split band having a groove 24 at its inner periphery, said band being adapted to, be moved over the outer ends of the fastening devices 22, so as to prevent their loosening. It will be seen that when the band 23 is removed, the fastening devices 22 may be loosened, so that the coupling sleeve 13 may be readily removed from the barrel 2.

In the operation, the motive fluid admitted to the rear end of the fluid pressure operated tool, causes the piston to be advanced in the well-known manner and the motive fluid passing from the forward end of the piston chamber 3 through the port or ports 25 and acting against a shoulder 26 on the piston, causes it to be returned to its initial position at the rear end of the barrel. When the piston reaches the end of its forward stroke, .the forward extension or striker 5 impacts against the end of the shank 7 of the working tool 8. In case the pneumatic tool is not held to the work, it will be seen that this will cause the working tool to move forwardly so that the end of the shank 7 is out of the path of the piston. The split ring 18 which is interlocked with the shank 7 W111 engage the shoulder 26 and prevent the working tool from being accidentally ejected from the barrel and the coupling sleeve.

When itis desired to remove the working tool, it is slmply necessary to draw the same outwardly in a proper manner, so that the split ring 18 will become disengaged from its groove 19 and the working tool may then be readily removed. It will be seen that when a working tool is inserted in position. its shank will pass through the aperture 16 and through the split ring 18 which will abut against the forward end of the barrel 2 so that the shank 7 will pass therethrough and the split ring will interlock with the groove 19 of the piston.

It will be apparent that the broad principle of my invention is equally applicable to a long or short stroke riveter or other pneumatic implement, which may be manually or mechanically held, and that the same is applicable to other forms of rivet sets or other working tools than that shown. My novel device can be readily and cheaply manufactured, can be quickly attached to and disconnected from the cylinder of the tool for the purpose of inspection and repairs, and will be found to be efficient and reliable in operation under all conditions. In case it is desired to renew or replace the split ring 18, this can be quickly and expeditiously done upon the removal of the coupling sleeve. as is evident.

It will now be apparent that I have devised a novel and useful pneumatic hammer, which embodies the features of advantage enumerated as desirable in the statement of the invention and the above description, and while I have. in the present instance, shown and described a preferred embodiment thereof which will give in practice satisfactory and reliable results, it is to be understood that the same is susceptible of modification in various particulars without departing from the spirit or scope of the inention or sacrificing any of its advantages.

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

1. In a device of the character stated, a rivet set having a shoulder thereon, a shank extending rearwardly from said shoulder and having a groove therein, a split ring engaging said groove, and a coupling sleeve adapted to be secured to a tool cylinder, said coupling sleeve carrying said shank and having a chamber within which said split ring reoiprocates, said split ring being adapted to slide over said rivet set shank to interlock with said groove, whereby the shank of the rivet set when pushed into said cylinder will cause the ring to interlock with the groove, and whereby said rivet set can be removed from said coupling sleeve without removing the coupling sleeve from the tool cylinder.

2. In a pneumatic hammer, the combination with a cylinder having at its forward end an aperture to receive a working tool and an enlarged chamber intermediate the ends of said aperture forming a rear and a forward shoulder, of av working tool having its shank extending into said aperture and provided with an annular groove, and a split ring detachably connected with the v walls of said-groove to reciprocate in unison working tool can be assembled with respect to said cylinder and removed therefrom by relative longitudinal movement of the cylinder and working tool.

3. In a pneumatic hammer, a cylinder, a tubular sleeve connected to the forward end of said cylinder and apertured to receive the shank of a working tool and provided with a chamber of greater diameter than the diameter of said aperture, a working tool having its shank extending into said aperture, and a detachable member interlocked with said shank to move in unison with said shank with the same length of stroke as the length of stroke of the working tool and to engage the forward Wall of said chamber to prevent said working tool becoming disen-- gaged from the pneumatic hammer, said detachable member being adapted to slide over the shank of the working tool into its locked position when the working tool is in- 'serted into the c linder.

CHA LES H. HAESELER. Witnesses:

ERNEST REUBERTHY, FRANK E. GILES;