US2277639A

US2277639A - Filing tool

Info

Publication number: US2277639A
Application number: US361414A
Authority: US
Inventors: Robert W Hamilton
Original assignee: Individual
Current assignee: Individual
Priority date: 1940-10-16
Filing date: 1940-10-16
Publication date: 1942-03-24
Anticipated expiration: 1959-03-24

Description

March 24, 1942. R. w. HAMILTN 2,277,639

FILINGTooL Filed oct. 16. 1940 lfull surface bearing between the contacts.

Patented Mar. 24, 1942 UNITED STATES PATENT OFFICE FILDNG TOOL Robert W. Hamilton, Philadelphia, Pa.

Application October 16, 1940, Serial No. 361,414

f 12 Claims.

This invention relates to filing tools, and more to redress the faces of the contacts and, for the most efficient operation of the same, it is desirable that the faces be trued up so that when the contacts abut against each other, there will be a It will, therefore, be understood that the redressing of the faces of the contacts is difficult of proper accomplishment.

For the foregoing purpose there are procurable thin flat files which are adapted tov be inserted between the faces of the contacts but, by reason of the faces of such files being parallel, there is no allowance for the slight relative angularity of the faces which occurs when the contacts are separated for the insertion of the file therebetween. Some mechanics ,prefer to remove' the l s Thev principal object of the present invention is to provide a tool by means of which the contacts of the distributors ofv automotive engines and the like may be conveniently and accurately dressed without removing or dismantling the disy tributors or any of the parts thereof.

A further object of the invention is to provide a tool of the character aforesaid by means of which the faces of the contacts may be dressed in such relationship that, when the'contacts are brought together, the faces thereof will engage each other throughout.

A further object ofthe invention is to provide a Ytool of the character aforesaid in which the filing unit may be axially turned with respect to the operating members whereby the tool may be used in various positions and may also be used for the dressing of contacts which might otherwise be inaccessible.

A further object of the invention is toA provide, in a tool of the character aforesaid, means for compensating for differences in angularity of the faces of the separated contacts which occur by reason of differences in the lengths of the pivoted contact arms.

A further object of the invention is to provide a tool of the character aforesaid in which the ordinary thin flat les may be employed and utilized until the same are completely worn out throughout the greater part of their length.

The nature and characteristic features of the invention will be more readily understood from the following description taken in connection with the accompanying drawing forming part .hereof in which:

Figure 1 is a side elevation of a ling tool embodying the main features of the present invention;

Fig. 2 is a front elevation thereof;

Fig. 3 is a horizontal section, enlarged, taken approximately on the line 3-3 of Fig. 1;

Fig. 4 is a similar view'taken approximately on the line 4-4 ofFig. 1;

Fig. 5 is a horizontal section, enlarged, taken on the line 5 5 of Fig. l;

Fig. 6 is a transverse section, enlarged, of a modified form of file adapted for use in the tool of the present invention; and

Fig. 7 is a top or plan view of a portion of a distributor head illustrating the application of the operating portion of the tool for the dressing of the contacts thereof.

It will of course be understood that the descriptionanddrawing herein lare illustrative merely, and that various changes and modifications may be made in the structure disclosed without departing from the spirit of the invention.

Referring now more particularly to Figs. l to 5 of the drawing, in the particular embodiment of the invention therein shown, IiI and II are the operating handles of the tool, pivoted to each other by means of a bolt I2, and normally impelled to their most widely separated positions by means of a coil spring i3 disposed between said handles I0 and l.

The handle member i0 is provided, beyond the pivot bolt I2, with forwardly extending side members I4, the front ends I5 of which are curved to permit the positioning therebetween of a ring member I6. The ring member It is provided with an annular groove I'I for the mounting therein of a two part collar I8. Each end of each half of the collar I8 is bent outwardly as at I9 to provide trunnions 'which are journalled in apertures 20 in the curved portions I5 of the portions I4 of the handle member I0.

The ring member I6 is provided with a downwardly extending strut or standard 2i. The lower end of the strut 2l is provided with a recess as at 22'for the mounting therein of a foot member 23. The foot member 23 comprises two side plates 24 spaced from each other at the proper angularity by means of end blocks Ztand 26, andV secured to each other by means of rivets 2l passing throughv said end blocks. Each of the plates 24 is provided. with an aperture 23 of sumcient size to permit the contacts of the distributor to pass therethrough to engage the working faces of the file unit in the manner to be presently described.

The ring member I6 is also provided with a downwardly depending fiat spring member 29, the lower end of which is reduced in width to pass through the space between the plates 24 of the foot member 2.3. The lower portion of the spring member 29 is bent around as at 3i) on the under side of the block member 25 of the foot member 23. The foregoing arrangement is such that when the le unit is removed from the tool, the lower end of the spring 29 may be pressed toward the lower end of the strut 2l to permit Ythe foot member 23 to be removed and replaced by another of dierent size or shape. When, however, the le unit is in place, the spring 29 will be locked against such movement and the foot member 23 will thereby be secured in proper position at the lower end of lthe strut 2| and of the spring 29.

The handle member I l is also provided, beyond the pivot l2, with forwardly extending side members 34, the front ends 35 of which are curved to permit the positioning therebetween of a head member 35. The head member 35 is cylindrical externally and is provided with an annular groove 31 for the mounting therein of a two part collar 38 similar to the collar I8. Each end of each half of the collar 38 is likewise bent outwardly as at 39 to provide trunnions which are journalled in apertures 40 in the curved portions 35 of the portions 34 of the handle member Il.

'Ihe head member 35 is also provided with an aperture 4I extending vertically therethrough, said aperture 4| being sector shaped in horizontal plan, thereby to provide an abutting surface 42 against which the nle unit is adapted to be clamp-ed. The clamping means .preferably includes a plate member 43 which bears against the file unit and is adapted to clamp the same in the head member 35 upon the tightening of a set screw 44 which is also mounted in the head member 35. The upper end of the clamping plate 43 is bent over as at 45 at the top of the head member 3S to assist in positioning the same when the file unit is mounted in the tool.

Each of the handle members H is provided with a lug 46 on each side thereof which lugs, when the handle members are separated to their limit positions, bear against portions of the handle member I and thus prevent the jaw portions of the handle members Il! and ll from being separated to such an extent as would permit the lower end of the file unit from being Withv drawn from the foot member 23.

The file unit preferably comprises two of the ordinary thin iiat files 41, such as may be readily found on the market and which are intended to be used for the purpose of ling the contacts of electrical make and break devices. These iiles are ordinarily made of thin flat steel with parallel faces, the le teeth being provided over a considerable portion of the length, and the other part of the length being left uncut and usually shaped in the form of a handle.

A spacer strip 48 is also provided, said spacer strip 48 being interposed between the two thin le members 41. The faces of the spacer strip 48 are disposed at a slight angle with respect to each other so that the les will be clamped in the tool with their outer faces at the desired angularity. A plurality of said spacer strips 48 are preferably provided, each of a different angularity, whereby the tool .may be readily adapted for use in dressing the contacts of different distributors, it being understood that the contact arms of such distributorsare not of standard length and hence the angularity of the faces of the contacts for a given separation will vary in the different models.

However, if desired a single le 49 having the faces thereof at the proper angularity, as shown in cross section in Fig. 6 of the drawing, may be employed in lieu of the two thin flat iiles 41 and the spacer strip 48 as shown in the other gures of the drawing.

The operation of the tool may now be explained, reference being had more particularly to the arrangement as shown in Figs. 1 to 5 of the drawing, in which a pair of thin at files 41 are used with an interposed spacer 48 of the proper angularity. The le unit, as above, is mounted in the tool with the end of said le unit positioned within the foot member 23. The contact arm 50 of the distributor (see Fig. '1) is now manually retracted and the foot portion 23 of the tool inserted between the contacts 5| and 52 in such position that said contacts may extend into-the apertures of the foot member and bear against the working faces of the file unit at this point.

Preferably, in order to get prop-erpressure to effect a rapid and efiicient cutting to dress the faces of the contacts, the end of the contact arm 5i) and Ithe stationary contact support 53 are engaged by the jaws of a pair of ordinary pliers (not shown) which will cause the same to bear against the cutting faces of theiile unit with the requisite amount of pressure.

The handle members I0 and Il are now periodically squeezed toward each other to cause the end of the file unit, which is positioned within the foot member 23, to be reciprocated up and down and thus effect the ling of the faces of the contacts for Athe purpose of kdressing the same.

. After the action has proceeded fora suicient time, the pressureon the contactarm 5B and the stationary support `53 Vis released, the contact arm 55 being then retracted a suiiicient distance to free the contacts 5i and `52 from the footv member, after which the tool may be removed.

It will be found that ordinarily the surfaces of the files .which have engaged the contacts will be worn away in one or two dressing operations, this by reason of -the extreme hardness of the contacts used in the distributors. In order to present a fresh cutting surface, the pressure of the clampingplate 43 provided by the set screw 44 may be relieved, and the files 41 and spacing member 4B removed. The les 41 may then be turned around to present the other faces. The le unit is then reinserted in the tool and clamped in place therein as hereinbefore set forth.

After the end portions of each of the les 41 has been worn on both faces so that the end portions Vof the files are no longer serviceable, the les 41 may then have small portions at the ends thereof broken oif which will permit new and fresh portions of the les 41 to be brought to the operative location within the foot member 23.

I claim:

1. A portable hand tool for dressing the contacts Aof electrical make and break devices comprising a le unit, two members movable toward vand away Vfrom each other, parts connected to said members for manual actuation thereof, means carried by one of said members for clamping the iile unit thereto, parts carried by the other member and extending therefrom, and a foot member .supported .by said extending parts and in which the end of the file unit is guided.

2. A portable hand tool for dressing the contacts of electrical make and break devices comprising a file unit, two members movable toward and away from each other, parts connected to said members for manual actuation thereof, means carried by one of said members for clamping the flle unit thereto, parts carried by the other member and extending therefrom, and a foot member supported by said extending parts and in which the end of the i'lle unit is guided, said foot member having a pair of spaced side plates between which the end of the file unit is reciprocated.

3. A tool for dressing the contacts of electrical make and break devices comprising a iile unit, two members movable toward and away from each other, means carried by one of said members for clamping the le unit thereto, parts carried by the other member and extending therefrom, and a foot member supported by said extending parts and in which the end of the le unit is guided, said foot member having a pair of angularly spaced side plates apertured to permit the contacts to engage the working faces of the file unit as the same is reciprocated in the foot member.

4. A portable hand tool for dressing the contacts of electrical make and break devices comprising a file unit, two members movable toward and away from each other, parts connected t said members for manual actuation thereof, means carried by one of said members for clamping the le unit thereto, parts carried by the other member and extending therefrom, and a foot member removably supported by said extending parts and in which the end of the file unit is guided.

5. A tool for dressing the contacts of electrical make and break devices comprising a file unit, a pair of pivoted handle members having extending jaw portions, a head member mounted in the jaw portion of one of said handle members, parts mounted therein for clamping the file unit thereto, another member mounted in the jaw portion of the other handle member, parts carried by and extending from said member, and a foot member supported by said extending parts and in which the end of the le unit is guided.

6. A tool for dressing the contacts of electrical make and break devices comprising a file unit, a pair of pivoted handle members having extending jaw portions, a head member mounted in the jaw portion of one of said handle members, parts mounted therein for clamping the le unit thereto, another member mounted in the jaw portion of the other handle-member, parts carried by and extending from said member, and a foot member supported by said extending parts and in which the end of the file unit is guided, said foot member engaging portions of the contacts to maintain the Working faces of the file unit in proper relationship with said contacts.

7. A tool for dressing the contacts of electrical make and break devices comprising a le unit, a pair of pivoted handle members having extending jaw portions, a head member rotatably mounted in the jaw portion of one of said handle members, parts mounted therein for clamping the file unit thereto, another member rotatably mounted in the jaw portion of the other handle member, parts carried by and extending from said member, and a foot member supported by said extending parts and in which the end of the file unit is guided.

8. A tool for dressing the contacts of electrical make and break devices comprising a file unit, a pair of pivoted handle members having extending jaw portions, a head member rotatably mounted in the jaw portion of one of said handle members, parts mounted therein for clamping the file unit thereto, another member rotatably mounted in the jaw portion of the other handle member, parts carried by and extending from said member, and a foot member supported by said extending parts and in which the end of the le unit is guided, said foot member engaging portions of the contacts to maintain the Working faces of the file unit in proper relationship with said contacts. l

9. A tool for dressing the contacts of electrical make and break devices comprising a file unit, a pair of pivoted handle members having extending jaw portions, a head member mounted in the jaw member of one of said handle members, parts mounted therein for clamping the file unit thereto, another member mounted in the jaw portion of the other handle member, parts carried by and extending from said member, and

a foot member removably supported by said ex-V tending parts and in which the end of the file unit is guided.

l0. A tool for dressing the contacts of electrical make and break devices comprising a file unit, two members movable toward and away from each other, means carried by one of said members for clamping the le unit thereto, parts carried by the other member and extending therefrom, a foot member supported by said extending parts and in which the end of the illev unit is guided, said foot member having portions engaging portions of the contacts thereby to position the Working faces of the le unit with respect to said contacts, said foot member being removable from its supports for replacement by another of different size or shape.

ll. A tool for dressing the contacts of electrical make and break devices comprising a file unit, two members movable toward and away from each other, means carried by one of said members for clamping the file unit thereto, parts carried bythe other member and extending therefrom, a foot member supported by said extending parts and in which the end of the file unit is guided, said foot member having a pair of spaced side plates apertured to permit the contacts to engage the working faces of the file unit as the same is reciprocated in the foot member, and said foot member being removable from its supports for replacement by another of different size or shape.

12. A tool for dressing the contacts of electrical make and break devices comprising a file unit, two members movable toward and away from each other, means carried by one of said members for clamping the file unit thereto, parts carried by the other member and extending therefrom, a foot member supported by said extending parts and in which the end of the le unit is guided, said foot member having a pair of angularly spaced side plates apertured to permit the contacts to engage the Working faces of the file unit as the same is reciprocated in the foot member, one of the parts for supporting the foot member being movable with respect to the other when the file unit is removed from the foot member thereby to release said foot member for replacement by another of different size or shape.

ROBERT W. HAMILTON.