US1495318A - Crank handle and method of making the same - Google Patents

Description

May 27, 1924- v H. G. CARLSON CRANK HANDLE AND METHOD OF MAKING THE SAME Original Filed Nov 22.

Patented May 27, 1924.,

FlCE.

HJ'ALMAR G. CARLSON, OF WORCESTER, MASSACHUSETTS, ASSIGNOR TO ROCKWOOD SPRINKLER COMPANY OF MASSACHUSETTS, OF WORCESTER, MASSACHUSETTS, A

CORPORATION OF MASSACHUSETTS.

CRANK HANDLE AND METHOD OF MAKING THE SAME.

Application filed November 22, 1919, Serial No. 339,991. Renewed November 14, 1923.

T all whom it may concern Be it known that I, HJALMAR G. CARLsoN, a citizen of the United States, residing at lVorcester, in the county of lVorcester and State of Massachusetts, have invented a new and useful Crank Handle and Method of Making the Same, of which the following is a specification.

This invention relates to a method of making crank handles of sheet metal and to the crank handleitself, and the principal objects thereof are to provide a method of procedure for making a handle of that material, the shank of which will be as strong as can be made of solid material, toprovide an improved crank handle or wrench socket of a seamless character in which the socket is integrally connected with one side of the blank and passes through to the other side to provide a strong construction; to provide such a handle with a shank of doublethickness with one surface continuous and seamless; and to provide a method of drawing out a part of the blank to produce the wrench end of the handle, so that all the parts shall be of one piece and the wrench socket will be integral and seamless, thus producing a very strong construction; also to provide for concealing all the edges by bringing them into butt-end relationship to each other or to the other parts of the device. Further objects and advantages of the invention will appear hereinafter.

I Reference is to be had to the accompanying drawings, in which Fig. 1 is a plan of a flat blank of sheet metal showing the shape in which it is cut out and illustrating the result of the first drawing operation: a i

Fig. 2 is a central longitudinal sectional View of the same; Figs. 3, 4,- 5' and 6 are similar sectional views showing the successive results of the drawin operations; a i 5 I Fig. is a plan View of the form of the blank shown in Fig. 6;

Fig. 8 is a central longitudinal sectional view showing the result of the next two operations Fig. 9 is a plan of the same;

Fig. 10 is an edge view partly in section showing the finished article; and

Fig. 11 is a plan of the same.

To. produce aicrank handle of the form shown in Figs. 1.0 and 11,1 start with afiat blank cut out to the shape shown in Fig. 1. It isto be noted that this blank is provided with a. semi-circular end 14 and a smaller end 15 constituting more than asemi-circle to provide a neck at 16. These two ,partsare connected by converging sides 25, shownin the form of straight lines. At the center of the semi-circular end 14 I subject the flat blank to a drawing operation ,to provide a cylindrical projection 17 having a closed-flat end18. i

InFigs. 3, 4t and 5the blank is illustrated in the three stages which it assumes when subjected to three more drawing operations,

form shown in Fig. 5 is not material, that depending upon various elements as anyone skilled in the art Wlll understand.

The next drawing operation results in the form shown. in Figs. 6 and 7, in which the cylindrical projection 19 is changed to a square socket20, and its size. also somewhat reduced. The outline of the. blank is still not changedmaterially, as will appear from comparison of Figures 1 and 7.

Inext subject the blank. to a dieing opera tion to cutit .out at the large end. only, into a formfor permitting it tobe. fitted into the final shape desired, and at th e same time punch out the end of the socket .20 to get the result shown in Fig. 8., Thewholejof this bottom is punched out. The, changes made in the shape of the flat portion of the blank are to provide three substantially rectangular flat projections 21 centrally spaced ninety degrees from each other and radially located with respect to the center of the square wrench socket 20. The three flat projections are connected with each other by short arcs 22 concentric with the center of the socket 20. The adjacent ends of the two opposite projections '21 are separated from the main body of the blank by a pair of notches 23 for permitting of the next opera tion.

This next operation consists in forming the final handle by a series of bending steps, during which the three projections 21 are doubled over on the back and. their straight edges brought up against the straight sides of the socket 20 as shown in Figs. 10 and 11. The walls 24 which are straight, bounding the notches 23, are also brought up against the inner surface of the socket 20 as the two opposite edges 25 of the blank are turned over into contact with each other throughout the length of the handle on the underside thereof. This finishes the device around the four sides of the square socket 20 and leaves that integral, seamless and extremely strong.

At the other end of the crank a perforation 26 is provided before the bending operation takes place and preferably at the same time that the notches 23 and projections 21 are formed. Through this is in troduced the shank end of a handle 27, preferably hollow, although a solid handle can be introduced if desired. This is upset over the flat surface of the handle and headed over at 28 to fixit firmly in position.

The bending operation just above de. scribed also involves the bringing together of the circular edge 29 up over the headedover portion of the handle so as to contact with its edge all around and confine it in place and close all cracks. This adds to the security with which it is held.

I have also shown a bar 30 imbedded in the shank 31. This is not always necessary but when it is used it is placed in position before the bending operations above described and the edges 25 bent over it to firmly hold it in position for the purpose of strengthening the handle.

Although I have illustrated and described only a single form of the invention, I am aware of the fact that modifications can be made therein by any person skilled in the art without departing from the scope of the invention as expressed in the claims. Therefore I do not wish to be limited to all the details herein shown and described, or to the particular number of steps of each kind specified, but what I do claim is:

1. As an article of manufacture, a crank handle consisting of sheet metal and having a seamless wrench socket, integrally connected with one side of the shank and passing through the other side.

2. As an article of manufacture, a crank handle comprising a single piece of sheet metal having a seamless wrench socket and shank, said shank being of double thickness, one surface being continuous and seamless and the other surface being formed by bending the edges back against the rear surface thereof.

3. As an article of manufacture, a crank handle comprising a shank, a socket formed of a single piece of sheet metal pressed into shape, the shank having its edges bent over on the back into'abutting contact with each other near the center thereof, and provided with a plurality of substantially quadrangular projections located at right angles to each other symmetrically surrounding the socket and also bent over on the back into contact with a corresponding number of the sides of said socket to help sustain the socket in its normal position.

4. As an article of manufacture, a crank handle consisting of sheet metal and having a seamless wrench socket, the shank of said handle being of double thickness, one surface being continuous and seamless and the other surface being formed by bending the edges back on the rear surface thereof until their edges abut against each other throughout the length of the handle, and also abut against the wrench socket.

5. As an article of manufacture, a sheet metal crank handle having a seamless wrench socket and a shank of double thickness, one thickness being formed by bending the edges back on the rear surface, said socket being arranged perpendicular to the flat surface of the shank, and a handle passing into the end of the shank and engaging the bent over edges of the metal.

6. As an article of manufacture, a sheet metal crank handle having an integral sheet metal seamless wrench socket square in cross section and perpendicular to one flat surface of the handle, that fiat surface being seamless and having its edges bent under it and brought into contact with each other and with the outer surfaces of said socket.

7. As an article of manufacture, a sheet metal crank handle having a wrench socket, said handle having a shank of double thick ness, one surface being continuous and seamless and the other surface being formed by bending the edges back on the rear surface thereof, and a handle having its end passing through one wall of the end of the shank, riveted over on the other side of that wall and engaging the bent over edges of the metal.

8. The method of making a sheet metal crank handle which consists in cutting out of sheet a flat blank Wider at one end than LIX at the other and tapering, and providing at the wider end a cup-shaped projection therein by a successive series of die-pressing operations to provide a non-circular socket cutting out the end of said socket, cutting a plurality of projections arranged symmetrically around all sides ofsaid socket but one, bending over the opposite edges of the main portion of said blank until they come into abutting contact on the back, and bending over said projections to bring them into contact on the back with the surfacesott said socket.

In testimony whereof I have hereunto affixed my signature.

HJALMAR G. CARLSON.

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