US2483733A

US2483733A - Switch bank coating machine

Info

Publication number: US2483733A
Application number: US717179A
Authority: US
Inventors: Victor F Miller
Original assignee: Bell Telephone Laboratories Inc
Current assignee: AT&T Corp
Priority date: 1946-12-19
Filing date: 1946-12-19
Publication date: 1949-10-04
Anticipated expiration: 1966-10-04

Description

Get. 4, 949.

v. F. MILLER 2,483,733

SWITCH BANK COATING MACHINE FIG.

INVENTOR By M F MILLER ATTORNE V Get, 4, 1946 v. F; MILLER I 2,483,733

SWITCH BANK COATING MACHINE Filed Dec. 19, 1946 3 Sheets-Sheet 2 illllllllll lNl/EN TOR M E M/LLER A T TOR/V5 V ct. 351949. v. F. MILLER 2,483,733

SWITCH BANK COATING MACHINE Filed Dec, 19, 1946 5 Sheets-Sheet 3 In. I IMW'Q l-lilil-z' I unr- L lll INVENT'OR by M F. M/LLER I ATTORNEY Patented Oct. 1949 pmriso STATES PATENT omcsifi SWITCH BANK COATING -MAGHI-N E Victor F. Miller, Queens Village, N. Y., assignor to Bell Telephone Laboratories, Incorporated,"

New York, N. Y., a corporation of New Yo'rk Application December 19, 1946, Serial No. 717,179 7 Claims. (01. 91:62.5)

Thisinventi'on relates to a machine for coating electrical terminals with a preservative and protective substance and is more specifically related to such a machine for applying such substances as p'etrolatum to terminals of panel telephone switching system terminal banks.

It has been known for some time that the talking circuits, tip and ring of telephone switching equipment may be more noisy than desirable due to unstable "contact resistance between the terminals of said circuits and the contact brushes. Furthermore, it is well known that this unstable resistance is due largely to tarnishand dirt 'accumulation on the contacts of the terminal banks.

Prior experimentation has shown that such substances as Vaseline, commonly known as petrolatum, when used in mixture with small amounts of other substancesto control flow and abrasive properties of the composite mixture, are

suitable for application to selector bank terminals to inhibit the aforementioned undesirable tarnish and dirt conditions.

Heretoiore the particular compound used was applied to terminals by means of apaddle simi- Early to the method of applying putty with a putty knife or by means of a fiber member having a groove adapted to be filled manually with compound and having a handle by means of which the filled groove was made to fit over a row of terminals and moved so as to wipe the compound on said terminals or by means of a reservoir having a valved opening in a groove thereof whereby upon moving of said reservoir over a row of ter-' minals, the valve being opened, compound from the reservoir was deposited on said terminals. In each of the above apparatus no means has been present for control of the quantity of compound deposited on the terminals except whatever control the operator exercises by his skill.

The amount of compound deposited has depended upon the speed with which the applying device was moved. -Considerals le compound was wasted by applying an excessive amount in some instances. A skilled'operator was required to operate the applying 'de'vice. Furthermore, frequent refilling of theapplying machinesj'or tools was necessary. In general; the'prior means for applying such compound were expensive in labor and wasted material and costly in time consumption and relative work accomplished.

It is therefore the object "of the present invention to'provide a coating tool which is simple in construction, easy to operate and which is e'l i'ective to 'apply exactly the desired amouht'of coating cempou nd 'tothe article to be coated,

To attain this-object the present invention, a preferred embodiment of which is disclosed herein, comprises an applying tool having a reservoir therein for containing compound to be I-ap plied, and a special operating tip or head toinsure a uni.- iorm application of compound regardless of speed with which the tool is moved over the article to be coated, the operation of the tool being. requisite of no particular skill on the part of the -operator.

Briefly, the applying tool comprises a reservoir for the compound, the forward end of whichis bifurcated to enable-this end to straddle the brush rod of a switch. Each forward portion of thebiiurcated endis provided'with a flanged gear and a shoe, both of insulating material. The forward end or the tool is adapted to engage a double row or contact terminals, the terminals of each row meshing with the particular .gear located in position therewith. The rower rows of terminals en: gaging the gear or gears'i'n eitherfor bothof the ipr'ward portions of the bifurcated end is confined laterally by the shoe on one side and the flange or the gear on the othen. Each gear when rotated by movementof the tool over a row of ter- Ini'nals drives other gears of a gear pump-to thereby force compound from the reservoir, deposit it on the edges of the terminals and return excess compound to the said reservoir. The tool is fur.- ther provided with means for maintaining the compound in a fluid state. I 1

The following is a detailed disclosure of my invention discussed 'i n'connection with the drawings. forming. 'a part thereof of which drawing's the following are brief descriptions:

Fig. 1 illustrates a cut-away elevation View of a preferred embodiment of the invention; 'Fi'g. 2 shows a plan view of thefforward end. of the device in operational position relative to a panel switch terminal bank; I v 3 is an enlarged view taken along the lines 33 of Fig. 1 and showing in section some detailed features of the iorward end of the applying tool; Figs. 4 and '5 are enlarged views takenrespec tivly'along' lines 4- 4 and 5-5. of Fig. 1 and are se'ctionalize'd to facilitate subsequent discussions with reference to details shown; I

Fig. -6 illustrates an operational'step and relates closely to the structure or Fig. 14 from which figme it was developed; U I.

'7 is a cut away view taken along the lines il "cf'i 'i'e. 2 and is enlargedto assist in clarifying the cooperation between the parts shown and the terminal bank; and V its. 8 illustrates the referred manner of using the applying tool to coat tip and ring terminals of 3 a line finder or selector terminal bank of a panel system.

Referring first to Fig. 8, the applying tool is seen to comprise in general a body portion I of aluminum having attached thereto by means of screws 2, a frame member 3 to which is attached by means of screws 4, a handle 5 adapted to be grasped as shown. The body member I'has a reservoir 6 therein and transparent Lucite side plates 1 attached thereto to provide confining means to permit the reservoir to contain compound 8.

bearings

43 and 44, respectively. When assembled as shown by Figs. 1, 3 or 7 the gears form two meshed trains, one on either side of the bifurcated end 53 of the tool of Fig. 8.

Confined within each side plate 1 is a passageway such as 45 which extends for example from the compression area 46 of Fig. 1 between

gears

32 and 33 to the outermost end of one side of the bifurcated end I3 to the point designated 4! in Fig. 3. This passageway 45 is enlarged from point 43 to the point 41. An insulating shoe 49 is provided with a hollow shaft 50 as a bearing pin Cord 9 from a source of electrical energy is con-I K nected to the tool as shown. By means of inter: connections within the frame member 3, as will hereinafter be described, conductors II] are connected from cord 9 to lamp II situated on a universal swivel I2. 1

A forward end I3 is provided for this tool to enable it to engage the row I4 of tip terminals and the row I5 of ring terminals of a panel terminal bank I6. It is to be noticed that the end I3 of the tool is bifurcated to enable it to straddle the brush rod I1 and that the center row I8, or row of sleeve terminals, is not engaged by the forward end I3 of the tool. The latter features are more readily understood by referring to Figs. 2 and 3 and to the special end I3 as fully described in subsequent-disclosure with reference to Figs. 1 through '7, inclusive.

Referring now to Fig. 1, cord 9 is composed of conductors I8 and I9 which are connected to terminals 2!! and 2| respectively on terminal strip 22 attached to handle 5 by means of wood screws 23 as shown. The interconnection from conductors II] to the lamp II are made over terminals of terminal strip '22 as are the interconnections for the electrical heater 24 and thermostat 25 which are seen to be connected in series between terminals 2| and 23. The heater 24 and thermostat 25 are encased for protection from'the compound 8.

The body member I is here shown with a portion removed therefrom and constitutes the reservoir 6 when the side plates 1 are attached.

Plugs

23 and 21 are available for removal in case it is necessary to flush out and clean the tool. Plug 28 is available for removal to permit filling the reservoir 6 with compound 8. The screws 29 and 30 are provided to secure plate 3.I to body member I and the plate 3| in turn has attached thereto the lamp swivel I2.

' The forward end of the body member I terminates in a bifurcated end member I3, each portion of which houses agear pump. Figs. 2 and 3 indicate the nature of the bifurcationof this end of the tool to'permitit to, engage rows I4 and I5 of terminals and to straddle the brush rod I'I in-so engaging these rows of terminals. Along the outside of the aluminum body member I, and between the said body member I and the side plates I is a slot-like extension 42 of the reservoir for conducting compound 8 to the end of each of the forward portions of the bifurcated end I3. These slot-like extensions 42

house gears

32, 33 and 34 on one side and

gears

35, 3,6and 31 on the other side.

Gears

32, 33, 35 and 36 are held in bearing

pins

38, 39, 49 and 4| respectively situated in body member .I' and arerconfined within the slot-like extensions 42 by side plates 1. The nature of the circumferential clearances available to these

gears

32, 33, 35 and 36 within the slot-like extensions 42 is shown by Figs. 1 and 7.

Gears 34 and 31 are of insulating material and are flanged as indicated. These gears are held to the body member I by means of removable pin and is provided with an upturned slot 5| connecting the hollow shaft 58 with the space between the shoe 49 and the gear 34. This space is seen to be occupied by terminal I4 in Fig. 3, terminal I4 being confined laterally between the flange 52 of gear 34 and the inner surface of shoe 49 and is confined within the area adjacent the opening in slot 5I as shown in Figs. 4 and 7. The hollow shaft 58 is inserted into the enlarged portion of passageway and thereby fixes the shoe 49 in its correct operating position.

Referring to Figs. 1, 2, 4 and 6 a resilient latch arm 53 is pivotally fixed to the tool by screw 54. Arm 53 is provided with a knob 55 on the end thereof which is adapted to engage in a depression 53 in shoe 49 and is also'provided with a slot 51 adapted to lock the removable bearing pin 43 as shown in Figs. 1, 4 and 8. Fig. 6 illustrates that the knob 55 of arm 53 may be removed from depression 53 of shoe 49 and rotated to the dotted position of Fig. 1, whereby the shoe 49 with its integral hollow shaft bearing may then and only then be removed from the enlarged portion of passageway 45. At the same time bearing pin 43 of Figs. 3 and 4. may be removed to permit removal of insulator gear 34 for replacement or other reasons such as cleaning.

Another passageway is provided in each of the forwardly extending portions of body member I and is designated as 58 on Figs. 1, 5 and '7. This passageway 58 extends from the compression area 53 between

gears

33 and 34 back to the reservoir 6.

A further feature of interest is that the

gears

34 and 37 are of approximately one half the thickness of the

gears

33 and 36 mating therewith.

A description of the operations of the tool is set forth at this point based upon a knowledge of the structure described hereinbefore.

A compound which has been found to be satisfactory for use'in the tool previously described is a petrolatum compound composed of approximately 67 per cent Vaseline, 30 per cent mineral oil. (nujol), 1 per cent oleic acid, 2 per cent tetrodecanoland in some applications per cent of fine emery powder with a suitable per cent reduction of some other constituent. Vaseline is used as a cohering agent which has a somewhat solid consistency at room temperature and whose purpose is to keep oxidizing agents from attacking bank terminals and dirt from accumulating thereon. flow properties of the compound to insure its reaching all surfaces to be covered. Tetrodecanol is a wettingagent and the oleic acid acts to disperse attempted caking of wear products. Emery is used when abrasion is one of the purposes of the application. Of course, if no abrasive property is desired emery. isnot included among the compound constituents. This compound, as previously intimated, has a somewhat solid consistency at room temperature so that, in order to facilitate the application of such to terminals,

' it is necessary to heat the compound to fluidity The mineral oil controls the,

and then all the applying tool with same. IJh-e heater 2!; and thermostat will :keep the -compound -.at the {proper rfluid state while Pin the applying tool. 7

. The tool is applied to or made to engage the terminal ibank as shown in Fig. 8. l-hergears S t and 3 engage 'the terminals :i l and as shown in Fig. -'7.. No force is required to operate the tool since :its weight alone will move -it down (the bank under guidance of the operator. As the tool is moved down the bank the various gears will rotate in the directions indicated by the arrows in Figs. :1 and Each train of gears comprises a gear pump such that coating material, or .petro'latum compound or the like, "is forced from area 46 through zpassagewa-y d5 :into the hollow shaft-bearing 5e of shoe49--=and against the terminals such as M via slot ill in shoe 49. The flange 5-2 of :gear 34 assists in confining the material to the terminals. .At the same time some of the compound is c'arried by the various gears to each other and by this means the application thereof to the terminals is further augmerited. By employing =34 and 3 'of :reduced thickness relative to ,the other gears, :a control is realized over :the amount of material applied 'to the terminals. Also, as :is well known, the gear pump will apply a quantity aof material to the terminal :14 via ipassageway d5, dependent on *the speed at which theipump-is-driven. Thus a uniform quantity will :be deposited at all speeds at which the tool "is movedo-ver the :row'oi terminals. in addition, :gears 34 and =3? will. "carry excess tmaterial back to area 59 at \vhi'chjpoint the gears will iforc'e same back through spassage way 58130 the reservoir where :it may be reused.

The jpurrpose in :providing insulator shoes such as and insulator :gQBlYS such as 34 is :to enable use of this tool regardless of ,possible energized conditions of the'terminals such as 11 and to prevent short circuits ifrom terminals'suc'h as 15 under any conditions of energization, or other? wise of said terminals. It will beiseeni-from thev drawings that the terminals such as M y do not engage :pa'rt of the tool except insulation.

It is evident that the applying "tool enables the application of compound to the terminals uniformlindependent of the "speed with which the tool is moved down the bank of terminals.

addition, by virtue of the gear s'izes chosen for the particular purpose, :an unskilledoperator may do an efficient job in a short In order 'to employ this tool on terminal :bariks having different dimensions as to terminal spacing, etc, it is obvious that the number of gear teeth and gear and housing dimensions may be changed within the spirit of my invention as may other variations embodiments of my invention. Furthermore, it i s to be understood that the prior description or the .petrolatum compound considered preferable for use of the invention is not :to be considered as in any way limiting the scope of the invention, since, as will be obvious, there are probably innumerable such compounds which could he so applied to switch terminals. Consequently, the following claims are appended which alone define the scope of the invention.

What is claimed is:

1. A tool for applying coating material to the terminals of a panel switch bank comprising a reservoir for the material, a shoe of insulating material connected to the forward end of said reservoir for engagement with one edge of a row of bank terminalsfa flanged gear of insulating reservoir and ior=dcposlting item the teeth' of said flanged gear whereby the said teeth of said a flanged gear may deposit said material onthe 7 edges of said terminals. 1 i l 2. A tool for applying coating material to the terminals of a panel switch bank comprising *a reservoirior the -material, 'a shoe 'of insulating material connected to the forward end of --'said reservoir forengagement withone'edge of a row of bank terminals, a flanged gear of insulating material positionedaidj'acent said shoe and 'adapt ed to be m'eshe'd with the row of terminals with said flange in engagement with the other edge of the said row of terminals, 2. gear pump operable by said gear when said gear is rotated :by the movement thereof over the row of terminals engaged thereby for drawing material from said reservoir, and a passageway interconnecting a pressure :point in said gear :pump with the terminal contacting area of said flan'geobgea-r whereby the said gear :pump may "transmit materia l to the edges or said terminals. 7

3. A tool for applying coating material to-the terminals of a :panel switch bank comprising a reservoir tor the material; a shoe of insulating material connected to the forward end of said reservoir forengagement with'ione edgeiof "a row of "bank terminals, a flanged gear of insulating material positioned adj acent-said shoe t and adapted to the meshed with the row of terminals with said flange in engagement with the other edge of the said row of terminals, agear pump operable by said gear when -said gear isrotated by the movement thereof over -the row of terminals en'- gaged thereby for drawing material from said reservoir, a first Ioa'ssagewa'y mterconnectin'g a pressure point i-h said gear pump the ter iiiinal contacting area bf said flanged gear iv-hereby the said gun-1p transmit said material to the ed es ofsaid terminals, and a 'second pa'ssagew'ay tier-connecting a pressurenoint {of said gear ramp and the said reservoir whereby *the said gear pump may return excess material "from said flanged gear to said reservoir.

4. A tool for applying coating material to the terminals "of a panel switch bank comprising'a reservoir for the material, a shoe of "insulating material connected to the forward end of said reservoir "for engagement with one edge of a row of bank terminals, a flanged gear of insulating material position adj aeent said shoe and adapted to be meshed with the row of terminals with the said fiangein engagement with the other edge of the said row of terminals, and a "gear pump operable by said gear when said gear "is rotated by the movement thereof over the row of terminals engaged thereby for drawing material from said reservoir, for effecting the deposit of said material on the edge-S of said terminals and for effecting the return of excess material from said gear to said reservoir, the said gear pump drawing compound from said reservoir by having one gear of said gear pump exposed to the material in said reservoir and transferring material to succeeding gears of said pump through the meshed teeth of said gears and effecting the deposit of said material on the edges of said terminals by means of a first passageway located in the wall of said reservoir and connecting a pressure point in said ear pump with an orifice in the forward end of said reservoir adjacent the said edges of said terminals and effecting the return of excess material from said insulating gear to said reservoir by means of a second passageway located in the wall of said reservoir and connecting a pressure point between the said insulating gear and the said reservoir.

5. A tool for applying coating material to the terminals of a panel switch bank comprising a reservoir for the material, a shoe of insulating material connected to the forward end of said reservoir for engagement with one edge of a row of bank terminals, a flanged gear of insulating material positioned adjacent said shoe and adapted to be meshed with the row of terminals with the said flange in engagement with the other edge of the said row of terminals, and a gear pump operable by said gear when said gear is rotated by the movement thereof over the row of terminals engaged thereby for drawing material from said reservoir, for effecting the deposit of said material on the edges of said terminals and for efiecting the return of excess material from said gear to said reservoir, the said gear pump drawing material from said reservoir by having one gear of said gear pump exposed to the material in said reservoir and transferring material to succeeding gears of said pump through the meshed teeth of said gears and effecting the deposit of said material on the edges of said terminals by means of a first passageway located in the wall of said reservoir and connecting a pressure point in said gear pump with an orifice in the forward end of said reservoir adjacent the said edges of said terminals and effecting the return of excess material from said insulating gear to said reservoir by means of a second passageway located in the wall of said reservoir and connecting a pressure point between the said insulating gear and the gear of'the gear pump with which it meshes and the said reservoir, said first passageway including a hollow bearing shaft fixed in said insulating shoe and located within the said first passageway in the wall of said reservoir, said shaft terminating in said shoe at an orifice therein adjacent the edges of the said terminals engaged by said shoe, the said shaft adapting said shoe for removal thereof from said forward end of said reservoir, the said shoe and shaft fixed thereto being held in position in the forward end of said reservoir by spring means to prevent removal of said shoe from the said forward end of said reservoir during operation of said applying tool.

6. A tool for applying coating material to the terminals of a panel switch bank comprising a reservoir for the material, a shoe ofinsulating material connected to the forward end of said reservoir for engagement with one edge of a row of bank terminals, a flanged gear of insulating material positioned adjacent said shoe and adapted to be meshed with the row of terminals with the said flange in engagement with the other CJI edge of the said row of terminals, and a gear pump operable by said gear when said gear is rotated by the movement thereof over the row of terminals engaged thereby for drawing material from said reservoir, for effecting the deposit of said material on the edges of said terminals and for eifecting the return of excess material from said gear tosaid reservoir, the said gear pump drawing material from said reservoir by having one gear of said gear pump exposed to the material in said reservoir and transferring material to succeeding gears of said gear pump through the meshed teeth of said gears and effecting the deposit of said material on the edges of said terminals by means of a first passageway located in the wall of said reservoir and connecting a pressure point in said gear pump with an orifice in the forward end of said reservoir adjacent the said edges of said terminals and effecting the return of excess material from said insulating gear to said reservoir by means of a second passageway located in the wall of said reservoir and connecting a pressure point between the said insulating gear and the gear of the gear pump with which it meshes and the said reservoir, said first passageway including a hollow bearing shaft fixed in said insulating shoe and located within the said first passageway in the wall of said reservoir, said shaft terminating in said shoe at an orifice therein adjacent the edges of the said terminals engaged by said shoe, the said shaft adapting said shoe for removal from said-forward end of said reservoir, the said shoe and shaft fixed thereto being held in position in the forward end of said reservoir by spring means to prevent removal of said shoe from the said forward end of said reservoir during operation of said applying tool, said reservoir'including thermostatically controlled heating means for maintaining said materia1 in a fluid state, including means for filling and emptying said reservoir and including means for indicating the amount of material therein.

7. A tool for applying coating material to the terminals of a panel bank as described by claim 6 wherein the said forward end of the reservoir of said tool is bifurcated to enable the said forward end to straddle a brush rod of the switch mechanism associated with said panel bank, each branch of said bifurcated forward end containing said arrangement of gear pump, flanged insulating gear, insulating shoe and passageways and said bifurcated forward end adapted to engage two rows of said terminals to enable application of material simultaneously thereto.

' VICTOR F. MILLER.

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

UNITED STATES PATENTS Number Name Date 417,093 Robison Dec. 10, 1889 1,991,355 Alexander Feb. 19, 1935