US 1540374 A
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June 2, 1925. 1,540,374
r E. w. STEVENS LOCKING DEVICE FOR FLUID PRESSURE TOOLS Filed July 10, 9
En'wafll W Slaverzs mmw A ATTORNEY.
Patented June 2, 1925.
UNITED STATES 1,540,374 PATENT OFFICE.
EDVJ'ARD W. STEVENS, OF DETROIT, MICHIGAN, 'ASSIGNOR 'IO CHICAGO PNEUMATIC TOOL COMPANY, OF NEW YORK, N. Y.. A CORPORATION OF NEW JERSEY.
LOOKING DEVICE FOR FLU'IIJ-PRESSURE TOOLS.
Application filed July 10, 1923. Serial No. 650,591.
To all whom it may concern.
- Be it known that I, EDWARD 7. STEVENS, a citizen of the United States of America, and resident of Detroit, in the county of Wayne and State of Michigan, have invented new and useful Improvements in Locking Devices for F luid-Pressure Tools, of which the following is a specification.
This invention relates to locking devices for fluid pressure tools, such as pneumatic percussive tools, and particularly to devices adapted automatically to maintain a tight connection between the cylinder and the cylinder head or handle in spite of the jar and vibration caused by the operation of the tool. One object of the invention is to provide a simple device of the class described which is" economical to manufacture, easy to install, eliicient in operation and which is an improvement over prior devices of this character.
In order to illustrate the invention a preferred form thereof is shown in the accompanying drawing, in which: v
Figure 1 is a side elevational view partly in section of a pneumatic hammer embodying the invention;
Figure 2 is a front elevational view of the locking ring with a portion of the cylinder in section showing the automatic take-up mechanism;
Figure 3 is a fragmentary plan view partly in section showing the parts in operative arrangement;
Figure at is a plan view of the preferred form of spring; and
Figure 5 is a view similar to Fig. 2 showing a modification.
The invention is illustrated in connection with a pneumatic hammer having a cylinder A, a cylinder head or cap B in threaded engagement with the cylinder, a handle which may be integral with head B, a throttle control lever D pivoted to handle C, a deflector ring E covering the exhaust ports of the hammer and a locking ring F movable over the cylinder A and maintained in interlocked engagement with head B by suitable means such as the spring clip (it. Any suitable interlocking means may be provided on the contacting faces of the head B and the locking ring F such as cooperating ratchet teeth I) and f respectively.
The invention consists in the means proform of a lug a projecting into an arcuate' recess it in locking ring F wherein the resilient member such as a spring 11 is housed to be compressed between the end wall of recess 7L and the lug a. While the lug 0; may be made integral with the cylinder,
as shown and by preference it is formed on a pin a. seated in a shallow bore a in cylinder A. In Figs. 1 to 4 inclusive, a flat type of spring 7) is disclosed formed with reversed loops which requires only a very shallow recess as indicated. In Fig. a modification of the invention is disclosed in which a coil spring 2" is provided, the looking ring F in this case being provided with a pronounced protuberance or extension to permit the formation of a recess h sufficiently deep to house this spring.
The method of assembling the device is as follows: The cylinder head B is threaded upon the hammer cylinder A and set up as tightly as possible. Locking ring F is slipped over the cylinder until the abutments for the spring are in substantial alignment and spaced apart as far as recess h or it will permit. Spring 2' or c" is then inserted and the locking ring slid into engagement with the forward face of head it; A pipe wrench or spanner wrench is then used to rotate the locking ring against spring 2' pr 2" to compress the latter the desired amount, as two ratchet teeth. If ratchet teeth are not used for the interlocking means, the locking ring is backed off slightly during its partial rotation to compress the spring. With the parts in this position the spring clip G is applied and the tool is ready for operation. During operation the jar and vibration in time may loosen the threaded connection between cylinder A and cylinder head B, but the constant pressure exerted upon the ring F and interlocked head B by the compressed spring 2' or 2" automatically takes up this looseness and maintains a tight connection.
lVhile but one form and but one applica tion of this invention have been disclosed Ill) herein, it is to be understood that the inventive idea is not limited to the specific con struction or arrangement of parts shown but includes all structural modifications or uses coming Withinthe scope of the appendedclaims.
l. in a pneumatic tool, in combination a cylinder and a cylinder head in threaded engagement, a locking ring movable over said cylinder into contact with: the said head, :1 lug on said. cylinder'eextend'ing'into a recess insaid ring, and means in said recess in en gagement with said lug for rotating said head: relative: to said cylinderto take up any looseness of said parts,
2. Ina pneumatic tool, in: combination a cylinder and a cylinderliead in' threaded engapement, ring, movable over said cylinder into face, engagement with said head, interl' cking meansonsaid ring and head, said ring having a' recess, and means in said recess engaging said cylinder and said ring respectiyelyfor; rotating said head relatiye to said cylinder to takevup looseness of said parts.
in a pneumatic tool,in combination a cylinder and a cylind'er head in threaded engagement, a locking. ring encircling said cylinder and maintained in iace engagement with said head, said ring having arecess adjacent said cylinder, alug on. said cylinder extending Within said recess, and a resilient member seated in said recess and adapted" to be compressedagainst said lug for constantly urging said: ring and said head in a direction to tighten tlie latter on said cylinder.
at. In a pneumatic tool, in combination, a cylinder and a cylinder head in threaded engagement, a ring encircling said cylinder and in contact with said head, interlocking means on said head and said rin=g,and means for automa ticall y tightening said head on saidcylinder comprising a resilient member compressed between abutments on said cylinder and said ring respectively,
5. In a pneumatic tool, in combination, a cylinder and a cylinder head in threaded engagement, a ring encircling said cylinder and-in contact with said head, interlocking means on said head and said ring, and means for automatically tightening said head on said cylinder comprising a-butments on said cylinder and said ring disposed in the same transverse plane and a spring compressed between said 'abutinents and seated in arecess in said ring.
6. In a pneumatic tool, incombination, a cylinder, a cylinder head inthreaded engagement therewith, a ring movable over said" cylinder and maintained"v in interlocked engagement Withsaid head, and means for automatically tightening said head on said cylinder comprising a pin on" said cylinder having a lug projecting into a recess in said ring and a spring housed in said recess and compressed between said lug and an end wall of said' recess.
7'. In a pneumatic tool, in combination, a cylinder, a cylinder head in threaded engagement therewith, a ring movable over said cylinder and maintained in interlocked engagement with said head, and means for automatically ti'gl'itening said head on said cylinder comprising a pin on said cylinder havinga lug projecting into a recess in said ring and a flat reversely looped spring housed in said recess and compressed between said lug and an end Wall of'said recess.
Signed by me at Detroit, Michigan this 2nd day of July, 1923'.
EDWARD- W. STEVENS.