US1789567A - Tool and retaining means therefor - Google Patents

Description

' JanYZO, 1931. 1 vEfw. STEVENS ,7

' TOOL AND RETAINING MEANS THEREFOR Filed Jan. 1'7, 1928' BI CZYCI 7 gay INVENTOR. [Fa Ward W Sfevens VQM Z. W

A TTORNE Y.

Patented Jan. 20, 1931 UNITED STATES PATENT OFFICE EDWARD w. STEVENS, or DETROIT,

TooL comm, or NEW YORK,

MICHIGAN, AS SIGNOR TO CHICAGO PNEUMATIC N. Y., A CORPORATION 01 NEW JERSEY TOOL AND RETAINING mmns Tnnam'oa Application flled January 17, 1928. Serial No. 247,814.

used for cutting, punching, rivet busting and the like. In some respects it may be considered as a further development of and improvement upon the structures disclosed and 1 claimed in my Patent No. 1,609,136 issued November 30, 1926, for retainerfor rivet:cutting tools.

In using a tapered tool with Ia retainer of the type disclosed in the above patent, the '15 tool frequently wedges in the opening in the barrel nut retainer thereby causing annoyance and delay to the operator who is under the necessity of freeing the tool by striking the same against the work or by loosening it by blows with another tool.

One ob ect of the invention is to provide an improved arrangement binding and wedging of the tool. Other objects will be apparent from the detailed description which follows.

In order to illustrate the invention one concrete embodiment thereof is shown in the accompanying drawings in which:

Fig. 1 is a sectional view through the front end of a percussive machine disclosing a tool of the described type with retaining means therefor;

Fig. 2 is a front end elevational view of a detail of the retainer arrangement;

Fig. 3 is a front end elevational view of the tool shown in Fig. 1;

Fig. 4 is a top plan view of the working tool similar to that shown in Figs. 1 and 3 butwhaving a chisel end.

.The embodiment of the invention chosen for the purpose of illustration comprises a working tool A or A arranged to be secured to the front end B ofa percussive machine 0 any suitable or desired type by retaining means'indicated at C. As indicated, the tool A projects within the front end of the percussive machine, such as the cylinder B of a pneumatic hammer to receive upon its shank end the blows of the percussive member such form of tapered tool and retainer therefor which will prevent f preference the outer end of retainer as piston B. The retaining means C conforms substantially to that disclosed in my Patent No. 1,609,136, referred to above, having latching blocks 0 carried by an annular spring 0' and engaging suitable recesses in cylinder B .of the percussive machine. annular locking nut 0 such as disclosed in my copending application Serial No. 94,684- filed March 15, 1926, may be utilized to lock the barrel retainer C against removal.

As indicated in Figs. 1, 3 and 4, working tool A, which may take the form of a punch as shown in Fig. 1, or A in the form of a chisel as indicated in Fig. 4, or have a working end of any other desired shape, has a tapered portion (1 extending towards the working end, said end projecting through a bore in retainer 0 which is in axial alignment with'the piston chamber of the percussive machine. Suitable means are provided for guiding working tool A or A for limited movement relative to machine B and retainer 0 without wedging or binding while positively preventing its ejection from retainer C. The preferred means is a spline and groove construction. For convenience in' manufacture the splines are on the retaining means while the grooves are formed in the working tool.. By preference two splines 5 (Figsl and 2) are provided at diametrically opposite points and projecting into the bore provided by the tool retaining means and through which the working tool extends. The working tool has cooperating grooves 6, Figs. 1, 3 and. 4, at diametrically opposite points in the tapered portion a thereof, these grooves being in substantial parallelism with the axis of the tool as indicated in Fig. 1. The ends 7 of grooves 6 cooperate with splines 5 to form stops limiting the outward movement of tool A relative to retainer C.

While the splines may be formed upon barrel nut retainer C directly if desired by is formed with an inturned flange c (Fig. 1) leaving an opening of substantial size and a separate abutment piece or collar 8 is provided having a bore of reduced size with the splines 5 extending therewithin. Abutment collar 8 has a radially projecting flange 8a 100 which cooperates with flange c of retainer r and an extended portion 86 which telescopes within the bore of flange a. By preference also, an adapter bushing 9 is provided which fits within the end of cylinder B of the percussive machine and receives the shank end of the workin tool which may be tapered if desired as in icated at a the inner surface enough to wedge or bind in the bore. the present invention permits the use of a of the bushing being shaped to fit the shank of the tool. A spacing collar 10 of resilient material such as' rubber is disposed in retainer 0 yieldingly to maintain bushing 9 and abutment 8 in engagement with cylinder B and flange a, respectively, the inner diameter of collar 10 being 'suflicient to permit free movement of the working tool A within the limits provided by the bushing 9 and by the cooperating stops 5 and 7 When tool A is at the outer limit of its movement,

' the force of theblow delivered by piston b tool of greater strength and endurance b reason of its tapered shape without the di ficulties heretofore experienced in using such tools which result from their tendency to wedge and bind in retainers of the barrel type and without the disadvantages due toloose fit of the tool in the retainer when it is in its rearward position.

While a preferred form of the invention.

has been herein shown and described, it is to be understood that the invention is not restricted to the specific details thereof but covers all changes, modifications, and adaptations within the scope of the appended claims.

I claim as my invention '1. The combination witha percussive machine of a working tool extending into said machine to receive the blows thereof, said tool being tapered toward its working end,

and retaining means for said tool providing a spline and groove connection permitting limited movement of the tool'without binding or wedging of the tapered portion thereof with the retaining means on said machine, said tool and means requiring mounting of the former in the latter as a prerequisite to the insertion of the tool in and the application of said means to said machine.

2. The combination with a percussive mawithin said retainer, said collar chine of a working tool extending into said.

passage therethrough of said tool, an abutment collar within said retainer for preventing the ejection of said tool, and cooperating guide means on said abutment member and on the tapered portion of said tool permitting limited movement of the latter but preventing wedging enga ement of the tapered portion of said tool w1th said collar and insertion of said tool in any other manner except from the interiorof said retainer.

4. The combination with a percussive machine of a working tool extending into said machine tov receive the blows thereof, said tool being tapered toward its working end, a barrel retainer secured to said machine and having an inturned flange at its outer end providing an opening of a size to permit pas-' sage therethrough of said tool, a flanged the end flange of said retainer for preventing the ejection of said tool, and cooperating guide means on said abutment member and on the tapered portion of said tool permitting limited movement of the latter and its insertion only before said retainer is applied to. said machine but preventing wedging engagement of the tapered portion of said tool with said collar.

5. The combination with a percussive machine of a working tool extending into said machine to receive the blows thereof, said tool being tapered toward its working end, a barrel retainer secured to said machine and having an inturned flange at its outer endproviding an opening of a size to permit passage therethrough of said tool, an abutment collar for. said tool slidabl fitting aving a radial flange for engagement with said retainer flange and having an extended portion for telescoping engagement with said abutment flange,and cooperating guide means on said abutment member and on the tapered portion of said tool permitting limited movement of the latter and its insertion only'before said retainer and member are applied to said machine but preventing wedging engagement of said tool with said collar.

6. The combination with a percussive machine of a working tool extending into said abutment collar arranged to cooperate with machine to receive'the blows thereof, said tool being tapered toward itsworking end,

.collar and the tapered portion of said tool permitting insertion of said tool only from within said collar and limited movement of the same without permitting wedging or binding of the tapered portion of said tool in said collar.

7. The combination with the cylinder of a percussive machine of a tapered working tool arranged to extend within said cylinder 'to receiving the blows of said machine, an-

adapter bushing extending within said cylinder to receive the shank of said tool, a barrel retainer secured to said cylinder, an abutment collar within said retainer, resilient means encircling said 'tool betweensaid adapter and said collar to maintain the same yieldingly in spaced relation, and cooperat- 1ng means on said collar and on'the tapered portion of said tool providing a positive stop while ermittin limited movement of said tool without w ging or binding.

8. The'combination with the cylinder of a percussive machine of a tapered working tool'arranged to extend within said cylinder to receiving the blows of said machine, an adapter bushing extending within said cylinder to receive the shank of said tool, a barrel retainer secured to said cylinder, an abutment collar within said retainer, resilient means encircling said tool between said adapter and saidcollar to maintain the same yieldingly in spaced relation, and cooperating means on said collar and on the tapered portion of said tool providing a positive sto while permittin limited movement of sai tool without w ging or binding, said means comprising a spline on said collar engaging a groove in said tool in substantial parallelism with the axis of the latter.

9. The combination with the cylinder of a percussive machine of a tapered working tool arranged to extend within said cylinder to receiving the blows of said machine, an adapter bushing extending within said cylinder to receive the shank of said tool, a barrel retainer secured to said cylinder, an abutment collar within said retainer, resilient means encircling said tool between said adapter and said collar to maintain the-same yieldingly in spaced relation, and cooperating means on said collar and on the tapered portion of said tool permitting limited movement of said tool without wedging or bind ing, said means comprising diametrically opposed splines on said collar slidably received in grooves in said tool in substantial parallelism with each other and with the axis of the tool, the ends of the grooves engaging said splinesas stops.

10. A working tool for use with a percussive machine, said tool havin a' portion tapered toward its working en and an axial groove having an open end and extending partially into said portion in substantial parallelism with the axis of the tool.

11. A working tool for use with a percussive machine, said tool having reversely tapered portions extending substantially to the ends thereof and diametrically opposed axial grooves with open ends and in substantialparallelism with the axis of the tool extendmg partially into the tapered portion which leads to the working end of the tool.

Signed b me at Detroit, in the county of Wa e, an State of Michigan, this 14th day of anuary, 1928. v

4 EDWARD W. STEVENS.-

Images