US2438744A

US2438744A - Tool for setting bushings or inserts

Info

Publication number: US2438744A
Application number: US522151A
Authority: US
Inventors: Maurice J Flynn
Original assignee: Crompton and Knowles Corp
Current assignee: Crompton and Knowles Corp
Priority date: 1944-02-12
Filing date: 1944-02-12
Publication date: 1948-03-30
Anticipated expiration: 1965-03-30

Description

March 30, 1948. M. J. FLYNN TOOL FOR SETTING BUSHINGS OR INSERTS Filed Feb. 12, 1944 1 IX a gwua/rvbo' v flazaz'ced." @2279,

Patented Mar. 30, 1948 Maurice J. Flynn,

Crompton &

Mass a corporation at Massachusetts Knowles Loorn' Worcester, Mass, assignor to Works; Worcester,

Arm a w errets?! 12, iesgeni l i t tf fil (Cl: M -10) 7 Claims. 1

This invention relates to improvements in tools for setting bushings and it is the general object of the invention to provide a tool by which the bushing can be placed correctly for setting and then punched to hold it in the part into which it has been inserted.

It has been found difiicult to secure attachments to aluminum or magnesium by screws] directly engaging the latter due to the fact that screw threads in such metals are easily mutilated. It is found that if a screw is threaded into and then unscrewed from a tapped hole in such Soft metals the threads suffer rapid deterioration such as prevents a fit of requisite tightness. "It has been the practice heretofore to overcome this difiiculty by inserting hard metal bushin s into the soft metal, base and then secure the attachments to the bushings. As heretofore practiced, however, this operation has been tedious and time consuming owing to the difficulty oi maintaining the top surface of the bushing flush with the adjacent surface of the base while the bush.- ing is being fastened to the base.

It is an important object of my present invention to provide a tool having a threadedstem projecting from a shoulder so arranged that the bushing can be threaded on the stem up to the shoulder. The tool is then rotated to thread the bushing into the tapped hole of the soft base metal. When the shoulder of the tool engages the surface of the base metal the top of the bushing will be flush with the surface of thebase. A set of punches are then depressed toupset adjacent parts of the base metal and bushing to hold the latter in place. tion is performed while the bushing is held in correct position with respect to the base metal.

It is another object of the invention to provide means by which the punches will'normallybe in inoperative position where they will not inter-.

fere with threading the bushing into thebase metal. This feature of my invention may-include a spring actuated cap which yields. under a hammer blow to cause all of the punches to have the upsetting operation at the same time."

After the bushing has thus been secured to the base metal the punches are raised by the spring to permit turning the tool in a reverse direction without scratching the base metal.

When the upset metal left by the punching" operation projects appreciably above the surface of the base or bushing it may interfere with turning of the tool. It is another object of my invention to provide means which prevent-,the ifi The punching oper 3 new n y 2 upset metal" from interfering with the itooh it ,rnedreyer ey e o W th he I fand' other ob 'cts' in "view will appear the-description proceeds, -:my :ms

ventio residesin tne combinatienend arranges pentot" arts" hereinafter deseribed and' -"set in "the" accompanying-- drawings;- wherein four meinvnuenareshown s-a ver't al sec-ten through a tobhmade I A to the referred; term: or my: present inventic showing the" bushing and a (he. adjacentfmetal into which the bushing zl's thread; 1

Fig fifisra bottom-plan view 0! steamer-Hand bushing'looliing-in the direction-or arrhwt; Eig 3shows a base of Seaman: a-iifittmg or attachment held thereto 'by means are screw threaded a' pusnmg wmen has- -been'bsetzrih 0 v the use "of' my improvedotoolp Fig 4 i'sfa vertical-section tlirough the hushing, rig; v 551s; a view simmerm Fig. 2 bht wifihithe i o d and:showing?thefirstlmbdtvention,

float n of H ofiaontalseetionien line sea-s nger,

Fig: 9" is a view similar to '1 but showing --v"' in.

' ichjthe attaehm ntis to-besecures.

have Shawn; anattacnof any desired formand of the base.

to hold the bushing securely in the base.

points I4 of the punches. form at point 22, see Fig. 6, 'as a result of the setting the bushing with respect to the base 2, and permits the bushing first tobe threaded into the base metal and then secured to the base by a punching operation. In carrying the preferred form of my invention into effect I provide a tool body I having an outer knurled surface 8. "Extending downwardly from the body! is a shank 9 the' diameter of which will, always be larger than the diameter of the hole 5 in the base 2. The bottom of the shank 3 hasa surface or shoulder III to engage surface S of base 2 and surface I is perpendicular to the axis of the tool. r

Extending downwardly from the shank 9 is a reduced stem H having external threads to fit the internal threads 6 of the bushing. The stem I I is concentric with the axis of the tool and may be of any length sufiicient to hold the bushing. Passing vertically through the body I are bores l2, four being shown in the present instance. These bores are located at equal distances from the axis of the tool and extend upwardly from the surface I0 through the top of body 1. Located within each bore is a punch [3 having a sharpened lower end It for a purpose to be described. A cap I is fitted over and secured to the upper ends iii of the punches l3 and is recessed to receive the upper end of a light compression spring I! the lower end of which is located in a depression of body I. The spring tends normally to raise the cap so that the sharpened points I of the punches do not extend below the surface III. The pointed ends I4 of the punches lie on a circle of substantially the same radius as that of the tapped :hole in the base 2.

'In the use of the tool the bushing is first threaded on to the stem l l until the upper end thereof engages the surface I6, after which the tool is turned to thread the bushing into the tapped hole 5 on the base 2. The tool is turned until the shoulder l0 engages the topsurface S of the base, thus insuring alignment of the top surface of the bushing with the adjacent surface By a light hammer blow on the cap I5 the punches are then depressed, thereby upsetting adjacent parts of the bushing and base The tool is then turned in the reverse direction and the stem H unthreaded from the bushing, the latter remaining in the base 2. I, V v v In the use of the tool as already set forth small burrs are likely to be upset in both the base 2 ,;and the bushing 4 which might interfere with unthreading of the stem II from the bushing. When these burrs are small little or no diificulty is experienced in removing the tool, but when they are large enough to project above the level of V surface I0 an appreciable amount they may interfere withthe reverse turning of the tool necessary to remove it from the bushing. I have set'forth herein three modifications of the general arrangement shown in Fig. 1 to adapt the tool for use when the burrs are of considerable size.

7 The first modification is shown in Figs. 5 and'fi wherein'all the parts of. the tool-are as already described, but I add a small concentric groove 2| which is cut in upwardly in body 20 from surface It]. The center of the groove is located at the samedistance from the axis of the tool as the Any burr which may punching operation will thereforebe in the groove and will not interfere with the turning of the tool 29 when it is removed from the bushing,

In the second modification, shown in Figs. 7 and 8, the tool remains the same as shown in Fig. l, but a flexible washer is used to space surface 10 above the top surface of the base '2. In this sec ond modification I surround the upper part of the stem H with a small washer 25 of less diameter than the bore 5 so that it will not interfere with the plungers l3, and below Washer 25 I place a second washer 26 of a flexible material such as cork of a diameter preferably larger than that of bore 5. When this second form of the invention is used the bushing is threaded on the stem ll until it establishes a snug fit with the washer 26,

Y after which the tool is turned to insert the bushing into the bore 5 until the bottom of washer 26 engages the top surface S of the base 2. The plungers l3 are then depressed and pass through the soft cork washer 26 to provide the usual upset deformations in the base and bushing. Since the washers space surface In above the base and bushing, the tool can be turned in a reverse direction and be unthreaded from the bushing without interferenceon the part of the upset areas raised by the punches. In Fig. 8 onesuch upset area, similar to 22 in Fig. 6, is indicated at A.

In the third modification, shown in Fig. 9, the :body of the tool 36 is altered to provide a shoulder 3| which extends downwardly a slight distance below surface Hi. In Fig. 9 this distance is somewhat exaggerated for clarity. In the use of this third form of the invention the bushing is threaded on to the stem 35 until it engages the shoulder 3|. The bushing is then threaded into the bore 5 until surface If! strikes the top of the base '2, thereby locating the top surface of the this space an insufficient amount to reach the surface ID. The tool may. therefore be turned in a reverse direction after the punching operation without danger of intereference on the part of the upset areas. V

In Fig. 9 I show a feature of the tool which can utilized in the other forms if desired. Thestem 35 is made as a separate part and has a-shank 36 driven upwardly into a bore 31 opening downwardly from the bottom of the tool through'the shoulder 3|. The shank 36 is smaller than the threaded part of the stem 35 in order to limit upward movement of the latter with respect to the tool. A vent hole 38 may be provided for the escape of air when the shank is driven into the bore 31. The shank 36 is located centrally of the tool with respect to the plungers I 3, hence the lower threaded end of the stem 35 serves to' locate the plungers in the same position relatively. to the bore 5 as already described.

From the foregoing it will be seen that I have provided a simple tool by which a threaded bushing may be set into a base of soft metal. The tool has a threaded stem to receive the bushing and also has a shoulder which engages not only the bushing but also the adjacent surface of the base 2 so that the top Surfacesof the base and bushing will both lie in the. same plane. It will also be seen that I have provided a simple means by which adjacent parts of the bushing and the next. It facilitates the operation, however, to have all of the punches depressed at the same time and it is for this reason that I have shown them attached to the cap Hi. In the drawings I have shown four punches, but with small bushings three punches will sufilce, whereas with larger bushings it may be necessary to increase the number of the punches. The points M of the punches all lie on a circle which is concentric with the stem l l and it is for this reason that the upsetting referred to occurs at the correct points to secure the bushing to the base 2. It will further be seen that the modifications permit turning of the tool in the reverse direction even though the burrs raised by the punches should extend upwardly above the surface Hi. This last result can either be accomplished by a groove in the bottom of shank 9, a flexible washer, or an extension on the shank which provides a space below the surface S for the formation of the burrs.

Having thus described my invention it will be seen that changes and modifications may be made therein by those skilled in the art without departing from the spirit and scope of the invention and I do not Wish to be limited to the details herein disclosed, but what I claim is:

1. In a bushing setting tool having a body, a stem on the body rigid with respect thereto to position the bushing with respect to the body and prevent relative lateral displacement between the bushing and body, a shoulder on the body transverse of the stem to engage the bushing and limit movement thereof on the stem toward the body, the body having a series of bores therethrough terminating in the shoulder, the axes of the bores at the shoulder being spaced from the stem by a distance equal substantially to the radius of the bushing, and punch means guided in said bores for movement toward the bushing.

2. In a tool to set an externally and internally threaded bushing in a base having a screw threaded hole therein to receive the external threads of the bushing, said tool having a body, an externally threaded stem rapidly mounted on the body to fit the internal threads of the bushing and prevent relative lateral displacement of the body and bushing, a shoulder on the body transverse of the stem for engagement with both the bushing and base, and punch means guided by the body in a direction to upset adjacent parts of the bushing and base to secure them together.

3. In a tool to set an externally and internally threaded bushing in a base having a screw threaded hole therein to receive the external threads of the bushing, said tool having a body, a threaded stem rigid with the body to fit the internal threads of the bushing and prevent relative lateral displacement of the body and bushing, a bore in the body parallel to the stern and having its axis spaced from the axis of the stem by a distance equal substantially to the radius of the external threads of the bushing, a shoulder on the body to engage both the base and bushing, and punch means guided in said bore to upset adjacent parts of the bushing and base.

4. In a, tool to set an externally and internally threaded bushing in a base having a tapped hole to receive the external threads of the bushing, said tool having a body, an externally threaded stem rigid with the body to enter the internal threads of the bushing and prevent relative lateral displacement of the body and bushing, a shoulder on the body substantially perpendicular to the axis of. the stem to engage both the bushing and the base, said body having a series of bores therein the axes of which are spaced from the axis of the stem by a distance equal substantially to the radius of the external threads of the bushing, and punch means guided by said bores for movement toward the bushing to upset adjacent parts of the bushing and base to secure them together.

5. In a tool to set an externally and internally threaded bushing in a base having a threaded hole to receive the external threads of the bushing, said tool having a body, an externally threaded stem on the body to enter the internal threads of the bushing, a shoulder on the tool having a surface transverse of the stem for engagement with both the bushing and the base, and means guided in the body to upset adjacent parts of the base and bushing to hold them together, said body having a recess extending thereinto from said surface to receive the portions of the base and bushing which are upset in the punching operation.

6. In a tool to set an externally and internally threaded bushing in a base having a threaded hole to receive the external threads of the bushing, said tool having a body, a stem on the body to enter the internal threads of the bushing, the body having a series of holes therein the axes of which are parallel to the axis of the stem and spaced therefrom by a distance equal substantially to the radius of the external threads of the bushing, and a soft washer on the stem engaging that end of the bushing adjacent to said body and engaging portions of the base adjacent to said bushing and spacing the body from the base and bushing, and punch means in said bores to penetrate the washer and upset adjacent parts of the bushing and base.

7. In a tool to set an externally and internally threaded bushing in a base having a threaded hole to receive the external threads of the bushin, said tool having a body, an externally threaded stem on the body to enter the internal threads of the bushing, a stop surface on the body to engage the base, a shoulder on the body adjacent the stem extending below the stop sur face, and punch means guided by the body to upset adjacent portions of the base and bushing.

MAURICE J. FLYN'N.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 680,560 Barnes Aug. 13, 1901 831,162 Hord Sept. 18, 1906 1,326,195 Hasty Dec. 30, 1919 1,724,312 Pugh Aug. 13, 1929 1,797,390 Wood Mar. 24, 1931 1,952,395 'Iillyer et a1. Mar. 27, 1934 2,349,493 Enders May 23, 1944