US2502950A - Resistor - Google Patents

Description

April 4, 1950 F. R. HUGUS ETAL RESISTOR Filed May 1, 1948 lil:

v ww s ,M4/0m sistor which is capable of -materials are of such linea-4mm. 2, and

lation in aligned Openings.

mamelons lranklLBagruandJamesW.

Woolf, mnklin.

Pa., asllgnon to .ley Manufacturing Company,

aeefporationadlennsylvania Application Il! l, Il, Serial No. 24,454

. vi This invention relates electrical apparatus, andespeciallytoanelectrlcal resistor.

In some electrical applications, it becomes highly desirable to provide a pluraliiu of electrical resistors which can be quickly and easily installed and which are readily disassembled and assembled without the use oi' numerous small parts. auch as insulating washers and the like, which are apt to be mlslaid and lost in the course of maintenance of the resistors. It is also desirable that the resistors be capable ot withstanding high temperatures for short time periods without sagging or failing. When the resistors must be bled for any purpose,` such as maintenance, it is advantageous to be able to take the resistors from any vantage point, as for example from either end, from the side or from above the installation.

It is an object of this invention to provide an improved electrical resistor which is quickly and easily-installed and which is readily assembled and disassembled. Another object is to provide a rewithstanding high temperatures for short time periods without failure. and which oters a maximum resistance to the eiiects of corrosion, due to electrolysis, oxidation at elevated temperatures, and the like. These and other objects are accomplished in a resistor made up oi s plurality of interlocking parts held together by the terminal clamps at the ends, in which the construction is such as to give the resistor Va maximum of physical strength, and the mum resistance to corrosion.

In the drawings:

Fig. 1 is a top plan view of a resistor made according to the invention.

Fig. 2 isa longitudinal section on the plane of line 2-2 of Fig. 1.

Fig. 3 is a transverse line 3-4 of Fig. 2.

Fig. 4 is a transverse section on the:l plane ci section on the plane oi Fig. 5 is a detailed sectional view oi a portion ot a resistor showing a modiilcation of one oi the parts` .The invention shown is a piece of electrical apparatus comprising a resistor held in place in a pair of supporting frame members 2, having aligned openings 4 therein. End supports t oi any suitable non-conducting material, such as porcelain or the like, are mounted in opposed re- Each end support l is recessed. as shown at I, to receive the collapsed apart4 a nature as to oil'er maxiis om (ci. zei-u) 2 between and is held by the end supports. The collapsed ends Il present a semicircular cross section,asseeninFig.4. Formaximumcorrosion resistance at high temperatures, the tube I! is preferably made of stainless steel.

A hollow non-conducting member il of any suitable insulating material, such as porcelain, is mounted on the core member i2 in such a way as to completely surround or envelop the core member. An electrical conductor Il is mounted on the hollow non-conducting member; as can be readily seen from the drawings. the conductor Il is preferably helically wound on the hollow nonconducting member i4. A terminal Il is bent substantially at right angles, as shown at 2l. The bent portion 2li is securely welded to the end of conductor it in order to provide a good electrical path between conductor IB and the terminals. The terminal il extends through an opening 21 in its associated end support t.

A clamping member, indicated generally at 24, is mounted on the terminal at each end of the resistor outside the end support. The clamping member 2l perferably consists ot a U-shaped member 28 having aligned openings 28 in the opposite legs of the U. 'I'he openings 2l are intended to receive a line conductor (not shown). A screw member 30 threadedly engages the cross member of the U, and is adapted to clamp the terminal Il between the line conductor and the end ot the screw.

When the clamping members 24 are thus en- Sged'in tightly clamping the terminals il, the U-shaped members 28 tightly engage at their inner ends the outer faces of the end supports 8, and hold the parts of the resistor together in an assembled relation between them. In order that the U-shaped member 26 may not readily slip of! its associated terminal il, each terminal Il is preferably provided with a slightly wider portion beyond the end of the member 26. Thus the terminal Il will be T-shaped, as seen in Fig. 1, with the cross of the T being only slightly wider than the upright ofthe T.

To each terminal Il there is secured. as by Iwelding, an inwardly extending projection 32.

ends l l ot a tubular core member I 2 which extends 55 The lock member Il cooperates with the collapsed members 38 out through end of the core member I2 in non-rotative relationship thereto by means of an interlocking protuberance and recess. In the embodiment shown, the protuberance 40 consists of a boss on the lock member 38, and the recess 42 is provided in the walls of the collapsed end III of the core member I2. The protuberance and recess serve to hold the member 38 and core I2 together, againstboth axial and angular relative displacement.

It will be appreciated by those skilled in the art that the lock member 38 may be made of any satisfactory non-conducting material such vas porcelain, or the like.

Operation."

In assembling a resistor made according to the invention, each lock member 38 v.is put in place in a collapsed end of the tubular core member I2 with the protuberance or boss 40 engaging its cooperating recess 42. A projection 32 is slipped in place on the flat portion 39 of each lock member in such a manner that the extensions 34 and 3B engage the ends of the lock member. These parts are then slipped into a hollow non-conducting member I4; a conductor I6 is slipped over the outside of member I4, and terminals I8 are securely welded to the projections 32, thus securely locking the parts together. The bent portion 20 of each terminal is thereupon welded to the adjacent end of the conductor I6.

The resulting unitary construction is put in place in its installation with the terminals I8 extending outward through aligned openings 4 in the supporting frame members 2. The end supports 6 are put in place in the openings 4, with the collapsed ends I received in the recesses 8 and the terminals I8 extending through the openings 22. Clamping members 24 are put in place over the ends of terminals I8.

The line conductor ends are then slipped through the aligned openings 28 in the U-shaped piece 26, and the screw 30 is turned so as to clamp the terminal I8 between the conductor and the screw end. The resistor is then held together by the clamping and restraining action of the clamping members 24 at its ends, operating against the outer faces of the end supports 6. If it is desired to take' the resistor apart, it is merely necessary to remove the clamping members 24 from the line conductors, after which i the entire resistor is easily taken apart from either end by lifting the clamping member 24 oi its associated terminal I8, pulling the end support 6 outward endwise, and then pulling the body of the resistor consisting of the core member I2, hollow member I4, conductor I6, and lock the opening 4 in the frame member 2.

If there is not room outside the frame members 2 to remove the resistor body endwise, it can be removed from a position between the frame members 2, as, for example, from above,

- sospeso forth heretofore, and by thereafter moving the resistor body endwise through one of the openings 4 just enough to permit the opposite' terminal I8 to clear the frame member 2.

The advantages of a resistor made according to this invention will be evident to one skilled in the art, and consist in ease of construction of the unitary resistor body, in the ease with which this resistor body may be installed in its supporting frame members, and the corresponding ease with which it may be removed therefrom for maintenance or other purposes; and the high degree of physical strength of the strutcure and the resistance to corrosion and the like.

While there is in this application speciiically described one form which the invention may assume in practice. it will be vunderstood that lthis form of the same is shown for purposes of illustration, and that the invention may be modiiied and embodied in various other forms without departing from its spirit or the scope of the appended claims.

What we claim as new and desire to secure by Letters Patent is:

l. A resistor comprising a pair of non-conducting end supports, a core member extending between and held by the end supports, a hollow--non-conducting member enveloping and supported by the core, an electrical conductor supported on the hollow non-conducting member, terminals in electrical contact with the conductor ends and extending through the end supports, and clamping members mounted on the terminals outside the end supports, each clamping member including means to clamp its associated terminal between an electrical line conductor and a portion of the clamping member.

2. The resistor set forth in claim 1, in which each clamping member is U-shaped and has aligned openings in the legs of the U to receive the electrical conductor.

3. A resistor comprising a pair of non-conducting end supports, a core member extending between and held by the end supports, a hollow non-conducting member enveloping and supported by the core, an electrical conductor supported on the hollow non-conducting member, terminals in electrical contact with the conductor ends and extending through the end supports, a projection on each terminal and extending inward toward the opposite terminal, a lock member between each projection and the core end to hold-the core and hollow member in assembled relation, means cooperating with the terminals, the end supports, and with the conductors of an electric circuit to hold the resistor parts together.

4. A resistor comprising a pair of non-conducting end supports, a core member extending between and held by the end supports, a hollow non-conducting member enveloping and supported by the core, an electrical conductor supported on the hollow non-conducting member, terminals in electrical contact with the conductor ends and extending through the end supports, a projection on each terminal and extending inward toward the opposite terminal, a lock member between each projection and the core end to hold the core and hollow member in assembled relation, and clamping members mounted on the terminals outside the end supports, each clamping member including means to clamp its associated terminal'between an electrical line conductor and a portion of the clamping member.

5. Electrical apparatus comprising, a pair of Supporting frame members having aligned openings, a non-conducting end support in each opening, a core member extending between and held by a pair of said end supports, a hollow nonconducting member surrounding and supported by the core, an electrical conductor supported on the hollow non-conducting member, terminals in electrical contact with the conductor ends and extending through the end supports, Aand clamping members mounted on the terminals outside the end supports, each clamping member including means to clamp its associated terminal between an electrical line conductor and a portion of the clamping member.

6. The apparatus set forth in claim 5, in which each clamping member is U-shaped and has aligned openings in the legs of the U to receive the electrical line conductor.

7. Electrical apparatus comprising a pair of supporting frame members having aligned openings, a non-conducting end support in each opening, a core member extending between and held by a pair of said end supports, a hollow non-conducting member surrounding and supported by the core, an electrical conductor supported on `the hollow non-conducting member, terminals in electrical contact with the conductor ends and extending through the end supports, a projection on each terminal and extending inward toward the opposite terminal, a lock member between each projection and the core end to hold the core and hollow member in assembled relation, and means cooperating with the terminals, the end supports, and with the conductors of an electric circuit to hold the resistor' parts together.

8. The apparatus set forth in claim' 7, in which' the core member is a tube with collapsed ends, and the lock member at each end lies between the collapsed end and the projection.

9. The apparatus set forth in claim 8, in which the lock member and the core are provided with an interlocking protuberance and recess.

10. Electrical apparatus comprising a pair of supporting frame members having aligned openings, a non-conducting end support in each opening, the support having a recess in its inward face, a tubular core member having collapsed ends received in the recesses of a pair of opposed aforesaid end supports, a hollow non-conducting member on the core member, an electrical conductor supported on the hollow non-conducting member, a terminal in electrical contact with each conductor end and extending through its adjacent end support, and means cooperating with the terminals, the end supports, and with the conductors of an electric circuit to hold the resistor parts together.

11. In the apparatus set forth in claim 10, an, inwardly extending projection associated with each terminal, and a lock member between the projection and the core end.

12. The apparatus set forth in claim 11, in which the lock member and the core member are provided with an interlocking protuberance and recess.

FRANK R. HUGUS. JAMES'W. WOOLF.

REFERENCES CITED I The following references-are of record in the ille of this patent:

UNrrED STATES PATENTS

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