US3299388A - Electric resistance unit - Google Patents
Electric resistance unit Download PDFInfo
- Publication number
- US3299388A US3299388A US436978A US43697865A US3299388A US 3299388 A US3299388 A US 3299388A US 436978 A US436978 A US 436978A US 43697865 A US43697865 A US 43697865A US 3299388 A US3299388 A US 3299388A
- Authority
- US
- United States
- Prior art keywords
- grid
- grids
- terminal
- mounting
- bridging
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C3/00—Non-adjustable metal resistors made of wire or ribbon, e.g. coiled, woven or formed as grids
- H01C3/10—Non-adjustable metal resistors made of wire or ribbon, e.g. coiled, woven or formed as grids the resistive element having zig-zag or sinusoidal configuration
Definitions
- resistors of the grid type were individually stamped from a sheet of resistance material.
- the resis tor banks were constructed by utilizing individual grid units and tightly clamping them together at their alternate ends between end frames, in a parallel spaced relationship, by means of suitable insulated bolts.
- the insulated bolts were passed through suitable mounting means located at or near the opposite ends of the individual grid units. This connected the individual grid units in a series electrical relationship.
- the electrical connection between two adjacent independent grids was at the ends that were held together by the pressure exerted on them due to nuts threaded onto the ends of the insulated bolts.
- resistors of this type are often used in locations where there are many vibrations and jars due to the surrounding operating equipment. If the weld between the adjacent grid units was not strong, it would be caused to separate partially or entirely. If the weld separated only partially, the area would then become one of increased resistance and cause the excessive heating and the probability of a resultant burnout. At times, the welding set up stresses in the material causing excessive heating at spots and which would result in burnout of the material.
- Another object of my invention is to provide a resistor which may be readily assembled and inexpensively manufactured.
- Still another object of my invention is to provide resistor units in which the heating is reduced to a minimum.
- Another object of my invention is to provide a plurality of terminal means so the resistance of the bank may be picked ofl? in small increments.
- the resistor grids of this invention are stamped from sheets of resistance material.
- the grids themselves are long and narrow having a plurality of slits therein alternately extending through opposite edges of the grid to provide a current path of substantially the same cross section.
- the grids remain connected to each other by a bridging portion of the sheet, alternately at opposite ends to the grid next adjacent. This is so a continuous current path is formed through all of the grids and the bridging portions stamped from the sheet of resistance material.
- the bridging portion connecting the grids is of at least the same cross section as the current path in the grid itself.
- the bridging portion connecting the grids together at one of their ends is the terminal portion and is bent, in effect, to bend to grids back upon themselves.
- the other bridging portion is left straight so the grids, when mounted, will form a plane alternately above and below each other.
- a plurality of terminals are provided. Also, since the terminal is an integral part of the grid, there is no need for a separate terminal or means of mounting it, or to insure a good electrical connection exists between the terminal and the grid.
- the grids are made into banks by passing the insulating mounting means or bolts through the respective holes punched in the grids for the mounting of the resistors.
- Metallic collars or spacers are placed between the resistor grids and over the insulating bolts to keep the grids physically spaced from each other. Nonconducting spacers may be used, if desired.
- An insulating washer is placed between one end of the metallic collars and one of the adjacent grids to prevent an electrical connection by this means between the adjacent grids.
- FIGURE 1 is a view of the grid configuration stamped in the flat metal sheet
- FIGURE 2 is an exploded view of the grids after hav- With reference to FIGURE 1, individual grid units are shown generally at A, B, C, D and E.
- a sheet of resistance material is stamped to provide a single current path at the left side of grid unit A, which also serves as a terminal 10, and ends at the other end of grid E.
- the grid unit A is separated from grid unit B by cuts made along lines 11.
- Slits 12A and 12G are stamped alternately into grid A from opposite edges to form the current path throughout its length and terminates in a bridging portion 13.
- Terminal has a square aperture 14 and a round hole 15 punched therein.
- Bridging portion 13 has a hole 16 punched therein.
- grid B is separated from grid A by cuts 11 and grid B is likewise separated from grid C by cuts 17.
- Grid B has slits 18A to 186 stamped alternately in opposite edges to form the current path and terminates into a bridging or terminal portion 19.
- Terminal 19 has square apertures 21B and 21C and a round hole 22 punched therein. Terminal 19 is separated from terminal 10 by slit which connects by a portion of cut 11 to slit 12A.
- Terminal 19 connects to grid unit C which is separated from grid unit B by cuts 17 and grid unit D by cuts 23.
- Grid unit C has the alternate slits 24A to 24G stamped in opposite edges to form the current path which terminates into bridging portion 25.
- Bridging portion 25 is separated from bridging portion 13 by a cut 26 which connects to slit 18A. Bridging portion 25 has a hole 27 therein.
- Bridging portion 25 forms the current carrying path from grid unit C to grid unit D, which is separated from grid unit E by cuts 28.
- Grid unit D has the series of alternate slits 29A to 29G stamped into the opposite edges to form the current path which terminates into bridging or terminal portion 30.
- Terminal 30 is separated from terminal 19 by a slit 31 which connects by a portion of cut 23which connects to slit 24A.
- Terminal 30 has two square apertures 32D and 32B and a round hole 33 stamped therein.
- Terminal 30 is connected to grid E, which is separated from the next succeeding grid (not shown) by cuts 34.
- Grid E has the alternate slits 35A to 35G stamped into opposite edges to form the current path and terminates to a bridging portion 36.
- Bridging portion 36 is separated from end portion 3 by a cut 37 which connects to slit 29A. Bridging portion 36 has a hole 38 in it.
- the current paths of the individual grids are formed by the stamping out of the alternate slits to form the longest possible current path from a minimum of overall grid length and still maintain a uniform cross section throughout the entire current path.
- a triangular shaped aperture 48 is stamped in grid C and connected to slit 18G to facilitate bending.
- a triangular shaped aperture 49 is stamped in grid E and connected to slit 29G to facilitate bending.
- FIGURE 2 illustrates and shows the resistor section after the bending has taken place. It is seen that the terminal portions are bent back on themselves so the two connected grids end up in the same plane. The bridging portions at the other end of the grid are left straight thereby placing the two connected grids in different planes.
- the terminal portions are alternately bent in the opposite direction so that the grids will be placed in two horizontal planes, one above the other. It also makes holes 16, 27 and 38 line up with each other and-holes 15, 22 and 33 line up with themselves, see FIGURE 5.
- the bolts 39 and 41 are fastened at their opposite ends to side plates 45 and 46 by means of nuts 47.
- Spacers 43 are positioned between the grid units and the end plates 45 and 46.
- Insulating washers 44 are placed between spacers 43 and the side plates 45 and 46.
- the grids When assembled, the grids form two horizontal planes as it is shown by FIGURES 4 and 5, one above and one below the plane formed by the insulating'mounting means or bolts 39 and 41.
- a wire is connected to terminal 10 and current flows through the current carrying path of grid A, up bridging portion 13 and back through current carrying portion of grid B.
- Terminal 19 presents a point at which a second wire may be connected and the current taken off, see FIGURE 5.
- the current will flow through the current carrying path of grid C, down bridging portion 25 to grid D and back through the current carrying path of grid D to terminal 30.
- the second wire can be connected by a wire if desired. If not, the current can go through the current carrying path of the next two grids in the same manner as described for grids C and D, see FIGURE 4.
- the bank has a terminal available every time the current path reaches the front portion of the bank.
- the grids zigzag back and forth between the two mounting bolts such that in a vertical direction one grid does not cover the other. This allows for the maximum convection of heat away from the grids, thereby allowing them to have a higher current carrying capacity.
- the terminal is an integral part of the grid, thereby eliminating the need for a separate terminal, means for mounting or securing it to the bank, and making positive the electrical connection between the terminal and the grid. Further, the
- a resistance grid assembly comprising a pair of spaced insulated support members, a plurality of platelike grids formed of a sing-1e piece of fiat metal to provide a continuous current path throughout the grid assembly, said grids being connected to one end by a terminal portion formed by bending the grids to different planes so the grids extend in a zigzag manner between the support members, every other grid having an integral mounting projection forming a part of the corresponding grid terminal portion and secured to the adjacent support member in spaced relation to a contact connecting portion of the terminal portion.
- a resistance grid assembly comprising a pair of spaced frame members connected by spaced apart insulated support means; a plurality of grids connected at one end to an adjacent grid by an integral end terminal portion which is bent back on itself and connected at the other end to the other adjacent grid by a bridging portion, said terminal portion having a wire connecting opening therein, and said grids being made from a single continuous piece of resistance material to provide a continuous current path throughout the grid assembly with the current transfer from the one grid to the other at the terminal portion, each grid having a plurality of slits therein alternately extending through opposite edges of the respective grids to define a current path through the grid; said grids being connected to one insulated support means spaced inwardly of the wire connecting opening in the terminal portion and the bridging portion connected to the other insulated support means so the grids extend in a zigzag manner between the support means with pairs of the grids on opposite sides of the plane of the support means.
- a multipler resistor grid comprising a single piece of resistor material cut and formed into a plurality of interconnected similar grids disposed in a pair of parallel planes, the grids in one plane being joined to each other at one end by simliarly folded bridging portions and the grids in the second plane being joined to each other at the corresponding one end by similarly and opposite folded bridging portions, said folded bridging portions being provided with integral terminal means, alternate grids in each plane having mounting tabs spaced from the terminal means in overlapping relationship and having aligned integral mounting means, and the opposite ends of the grids being connected by bridging sections having similar mounting means in alignment with each other.
- a multiple resistor grid comprising a single piece of resistor material cut and formed into a plurality of interconnected similar fiat grids disposed edgeways in a pair of parallel planes, the grids in one plane being joined to each other at one end by similarly folded bridging portions and the grids in the second plane being joined to each other at the corresponding one end by similarly folded bridging portions, said folded bridging portions in said two planes being oppositely folded and being provided with terminal openings, alternate grids in each plane having mounting tabs projecting toward the opposite plane and having a mounting opening aligned with the other mounting openings, the grids between said alternate grids having cut away portions aligned with said tabs to allow unobstructed communication between said mounting openings, and the opposite ends of the grids being connected by planar bridging sections having mounting openings in alignment with each other.
- a thin planar rectangular blank having a substantially greater longitudinal length than width, said blank being of a metallic resistor material, a plurality of equally spaced parallel zigzag cuts extending laterally between the side edges and terminating in spaced relation to said edges, and defining a terminal and mounting portion to one side and a mounting portion to the opposite side of the zigzag cuts, each out being formed of similar rectilinear portions, mounting openings formed in said mounting portion in alignment with alternate zigzag cuts, transverse separation slots in the mounting portion in alignment with alternate zigzag cuts between said mounting openings and extending from the adjacent side edge to the end of the adjacent zigzag out, said terminal and mounting portion having second mounting openings in alignment with the mounting openings in said mounting portion in spaced relation to the adjacent end of the corresponding zigzag cut and to the side edge of the blank, transverse separation slots in the terminal and mounting portion extending from the ends of the zigzag cuts outwardly to the blank edge in alignment with the alternate zigzag cuts aligned with
- a lateral slot in the terminal and mounting portion extending laterally between the side edges and terminating in spaced relation to said edges and defining a terminal and mounting portion to one side and a mounting portion to the opposite side of the zigzag cuts, each out being formed of similar rectilinear portions, slits formed at each junction of said rectilinear cuts and at the end of each zigzag cut, said slits extending longitudinally alternately in opposite directions from the zigzag cut, transverse slots in the mounting portion in alignment with the zigzag cuts between said mounting openings and extending from the adjacent side to the end of the adjacent zigzag cut, second mounting openings formed in said terminal and mounting portion in alignment with the mounting openings in said mounting portion and in spaced relation to the adjacent end of the corresponding zigzag cut and to the side edge of the blank, a lateral slot in the terminal and mounting portion
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- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Details Of Resistors (AREA)
Description
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US436978A US3299388A (en) | 1965-01-27 | 1965-01-27 | Electric resistance unit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US436978A US3299388A (en) | 1965-01-27 | 1965-01-27 | Electric resistance unit |
Publications (1)
Publication Number | Publication Date |
---|---|
US3299388A true US3299388A (en) | 1967-01-17 |
Family
ID=23734577
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US436978A Expired - Lifetime US3299388A (en) | 1965-01-27 | 1965-01-27 | Electric resistance unit |
Country Status (1)
Country | Link |
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US (1) | US3299388A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20130328660A1 (en) * | 2010-12-03 | 2013-12-12 | Vishay Electronic Gmbh | Electrical power resistor |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1719179A (en) * | 1926-07-19 | 1929-07-02 | Ward Leonard Electric Co | Resistance device |
US1861434A (en) * | 1927-05-04 | 1932-06-07 | Cutler Hammer Inc | Resistance element |
US1962673A (en) * | 1930-11-24 | 1934-06-12 | Allen Bradley Co | Electrical resistor |
US2769885A (en) * | 1954-04-26 | 1956-11-06 | Cutler Hammer Inc | Resistor units |
US2969516A (en) * | 1959-10-27 | 1961-01-24 | Bois Robert E Du | Resistor structure |
-
1965
- 1965-01-27 US US436978A patent/US3299388A/en not_active Expired - Lifetime
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1719179A (en) * | 1926-07-19 | 1929-07-02 | Ward Leonard Electric Co | Resistance device |
US1861434A (en) * | 1927-05-04 | 1932-06-07 | Cutler Hammer Inc | Resistance element |
US1962673A (en) * | 1930-11-24 | 1934-06-12 | Allen Bradley Co | Electrical resistor |
US2769885A (en) * | 1954-04-26 | 1956-11-06 | Cutler Hammer Inc | Resistor units |
US2969516A (en) * | 1959-10-27 | 1961-01-24 | Bois Robert E Du | Resistor structure |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20130328660A1 (en) * | 2010-12-03 | 2013-12-12 | Vishay Electronic Gmbh | Electrical power resistor |
US9117575B2 (en) * | 2010-12-03 | 2015-08-25 | Vishay Electronic Gmbh | Electrical power resistor |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: COMMANDER ELECTRICAL EQUIPMENT, INC., 950 WARDEN A Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:GTE PRODUCTS CORPORATION;REEL/FRAME:004202/0427 Effective date: 19831130 Owner name: COMMANDER ELECTRICAL EQUIPMENT, INC., 950 WARDEN A Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:GTE PRODUCTS CORPORATION;REEL/FRAME:004213/0332 Effective date: 19831130 Owner name: COMMANDER ELECTRICAL EQUIPMENT, INC., CANADA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:GTE PRODUCTS CORPORATION;REEL/FRAME:004202/0427 Effective date: 19831130 Owner name: COMMANDER ELECTRICAL EQUIPMENT, INC., CANADA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:GTE PRODUCTS CORPORATION;REEL/FRAME:004213/0332 Effective date: 19831130 |