US946576A - Resistance-terminal. - Google Patents

Description

F. D. HALLOCK.

RESISTANCE TERMINAL.

APPLICATION mum JAN.3. 1906.

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INV ENTOR d m W WITNESSES: V 61. WW

ATTORNEY P. D. HALLOOK.

RESISTANCE TERMINAL.

APPLICATION FILED 5mm. 190a.

Patented J an. 18, 1910.

2 SHEETS-SHEET 2.

' AT'TORNEY 'ELE'rcHEB D. HALLOCK, or wrnxmsnuae, PENNSYLVANIA, assrcnoa row srIne- HOUSE ELECTRIC 8: MANUFACTURING COMPANY, A CORPORATION OF PENNSYL- VANIA.

RESISTANCE-TERMINAL.

Specification of Letters Patent.

Application filed January 3, 1906. Serial No. 294,468.

To'all it may concern:

Be it known that I, FLETCHER D. HAL- vIJocK",,-a citizen of the United States, and a resident'of \Vilkinsburg, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Resistance-Terminals, of'which the following is a specification.

'My invention relates to terminals, con-. nectors or similar parts for electrical apparatus and has special reference to con-- metal resistance units.

nectors which are adapted for use with cast The object oflm invention is'to provide means for connecting'the several units of a cast metal resistance group that" shall be simple and durable in construction and shall have no appreciable resistance drop 'when' the connection is completed or after an indefinite lapse of time. p

The use of cast metal resistance units has become well known'in the prior art, and in .assemblingsuch resistance groups, connectors of various kinds have been employed for completing the circuit from one unit to another. Of. all the methods which have been employed for connecting difl'e'rent units, perhaps the best results. have been obtained by finishin a small surface on each resistance unit and fastening a strip of conducting material in engagement with this.

surface by binding screws. According to another well known method, the engaging surfaces of adjacent units which are to be connected are finished and relatively heavy pressure applied to the assembled group in order to keep the finished surfaces in close engagement with each other. It will be observed that in both of the methods ohtlin'ed representative of prior practice, acertain amount of machining is essential and furthermore, although a slight resistance drop may be detected when the resistance group is first assembled, this drop has been found to increase, after the resistance has been in service for a considerable length of-time, to such an extent that the total ohmic resistance of the group is substantially increased by reason of the oxidation of the contact surfaces. This is particularly true of resistances which are subjected to severe weather conditions, such'as street railway diverters.

' l per, is cast into the extremities of each resistance unit and the projecting portions are divided longitudinally into two similar parts by a slot or sawcut. In 'thisway, the cast units may be assembled without machining and the connectors of ad acent units, which are to be electrically connected, are riveted Patented Jan. 18. 1910 tained between surfaces of a conducting section, of a resistance group of the grid type having the connectors of myinvention,

and Fig. 2 is an end elevation of the resistance of group of Fig. 1. Fig. 3 is a sectional elevation of a modified form of resistance 'unit with which lily-improved connector may advantageously be employed.

Referring to Figs. 1 and 2, the reslstancc group illustrated therein comprisesa plu- -rality of similar cast. metal resistance units 1 mounted upon a plurality of insulated rods 2, 3 and 4, which constitute, together structure which is supported at three points and which is stiffened by widening the strip at and near the points of connection to the rods 2, 3 and 4. The several units are insulated from the end castings by insulating and spacing Washers (i and are insulated from each other at suitable points by'rela tively thin washers 7 elf-insulating mate" rial, such as mica. The extremities of each unit adjacent to the rods 2 and t are provided with strips 8, of conducting material which are cast into the unitand' may serve as supports for terminals 9 or as connectors. The portion of each strip-8 which projects from the casting is divided longitudinally into two portions by a sawcut or slot 10 so that one'portion may be bent. in one direction and the other portion in the opposite direction in case it is de sired to connect any one unit with the adwith a pair of end castingsfi, a supporting .a multiple circuit arrangement. several units are to be connected in series relation the connectors on corresponding jacent units at each side in order to rovide W ien the of high resistance material such as metallic silicon provided with connectors 8 similar to the strips Sof Figs; 1 and 2 which are cast into the unit near its extremities. Several units of this form may be used either by themselves or in'ooinbination with units like those set forthein latentaNo. 788,686, grant ed to the Vestinghouse Electric & Manufacturing Company, as assignee of Hermon L. Van Valkenburg, or other units of the same "eneral form and dimensions.

Alt rough I have illustrated the connector of my invention as applied to specific types of resistance units, its use is not re stricted thereto and it is to be understood that considerable variations in the size and shape of the terminal members may be effected within the scope of my invention.

I claim as my invention:

1. A cast metal resistance unit havingflexible terminal or connecting strips of conducting material cast into and projectmg from ts extremities, the outer portions ofsaid strips being divided by longitudinal slots intotwo substantially similar ears.

2. A resistance unit comprising a casting having two branches of zigzag formation the outer extremltles of whlch and the unction between whleh are enlarged and provide'd with holes to receive insulated rods and havin terminal or connecting members of relative y low resistance conduct n material castinto the extremities 'o the branches and provided withho'les through subscribed my name this 30th day of December 1905.

FLETCHER DnHALLoeKQ v Witnesses .3

an R. J. Deana ax, Bmxnr Hixns.

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