Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.


  1. Advanced Patent Search
Publication numberUS723788 A
Publication typeGrant
Publication dateMar 24, 1903
Filing dateNov 29, 1902
Priority dateNov 29, 1902
Publication numberUS 723788 A, US 723788A, US-A-723788, US723788 A, US723788A
InventorsSamuel S Wales
Original AssigneeSamuel S Wales
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
US 723788 A
Abstract  available in
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

PATENTED MAR. 24. 1903.






mvin'ron 5. 5. VGA

Z .u. 1 a W E- h s a? 0 C. f

PATENTED MAR. 24, 1903.







THE uonms PEYERS co PHQTO-LITNQ, wAsum'oToN. a c.

I ing one arrangement of the washers and grids 7 Figs. and 6 are views similar to Fig. 4, showing, respectively, two panels in series and two panels arranged in f parallel; and Fig. 7 is a detail view showing UNITED STATES PATENT OFFICE.



SPECIFICATION forming part of Letters Patent N 0. 723,788, dated March 24, 1903.

Application filed November 29, 1902. Serial No. 133,239. (No model.)

To in whom, it may concern:

Be it known that I, SAMUEL S. \VALES, of Munhall, Allegheny county, Pennsylvania, have invented a new and useful Resistance- Box, of which the following isa full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification, in which Figure 1 is a side elevation of one unit or section of myimproved resistance. Fig. 2 is a plan view of one of the grids. Fig. 3 is a longitudinal section on the line III III of Fig. 1. Fig. 4 is an enlarged detail section showupon the end bolts.

the arrangement of the washers upon one of the middle bolts.

My invention relates .to the class of resistance-boxes, and more especially to'those wherein a series of separate grids are assembled into panels, a series of these panels being mounted in the resistance-box.

The object of the invention is to cheapen and simplify the construction and arrangement of the resistance structure, to do away I with the insulating-sleeves extending around the bolts which have heretofore been used, to arrange the sections so that one section may be lifted out of the box without disturbing the others, and to practically eliminate all machining of the parts.

In the drawings, referring to the form of Figs. 1, 2, 3, 4, and 7, each complete section, such as shown in Fig. 1, consists of a series of cast-iron grids 2, (shown in Fig. 2,) with end bearings or rings 8, which are threaded upon bolts 4, 5, 6, and 7. I have shown a system wherein three grids are employed end to end, with four bolts; but the numberof grids and bolts may be varied as desired. Each unit consists of a series of these grids mounted between the side plates 8 8. Each of these side plates preferably consists of a skeleton cast-iron plate having bosses 9 and 10 pro- ,jecting inwardly and provided with holes to receive the bolts. These plates are provided at their upper ends with lifting-handles 11 and with laterally-projecting lugs 12, which rest upon suitable projections in the receiving-box, the unit hanging upon these lugs and the grids being supported upon the several bolts, which are in turn supported in the side plates.

In assembling the grids. upon the bolts I do away with the insulating-sleeves, which extend the entirelength of the bolts, and employ insulating disks or washers 13 and metallic spacers or washers 14. The disks 13 are provided on both sides with annular shoulders 15, which register with corresponding shoulders 16 of the metal washers, forming annular recesses which receive the hubs 3 of the grids. In the form of Fig. 4, beginning at the left-hand end, 13 is the insulatingwasher,which fits nearly about the bolt 4, and 17 is a lead-out having a hub or ring portion 18, which tits in the annular recess on one side of the washer. The next element, 2, is the grid, the hub 3 of which fits against the ring 18 on one side and against the recess of the insulating-washer 13 on the other side. In the recess on the other face of the washer 13 fits the end hub of the next grid 2. The other ends of these two grids (shown at the bottom of the figure) fit within the opposite annular recesses of a metallic washer 14, forming a spacer between them and having an air-space between it and the bolt4. This forms a metallic connection between the two lower ends of these grids, the next metallic connection being by means of the next metal washer 14 around the upper bolt. The connections thus made between the grids place them in series with lead-outs at the desired points, while their ends are insulated from the bolts by means of the insulating-washers, which in-- terfit with them and with the metallic washers. In Fig. 7 I show the arrangement upon the intermediate bolts, which is the same in all cases, the end rings 3 of the grids being spaced apart from the bolt by fitting within the annular recesses of the insulating-washers 13.

In Fig. 5 I show an arrangement of two panels in series, in which 13 represents the insulating-washers, 2 the grids, and 14 the metallic spacers or washers.

' 'In Fig. 6 I show two panels arranged inparallel, 13 being the insulating-Washers, 2" the grids, and 14 the metallic spacers or washers. The panels may also be arranged IGO with three or more panelsin series or three or more panels in parallel, the arrangement being easily changed by changing the method of building up the grids, insulating-Washers, and spacing-washers upon the end bolts.

The advantages of my invention result from doing away with the insulatiu g-sleeve extending along the supporting-bolts, from the simplicity of the device, and the ease and cheap ness of manufacture. The metallic spacingwashers may be cast to form. Theinsulatingwashers are all duplicates, and the air-spaces between the bolts and the grids and metallic spacers give good insulation. The units into which the panels are built hang Within the box, and any one of them may be removed for repair or replacing without taking the box or the sections apart.

I have shown the metallic washers as having tapering holes for ease in drawing the castings; but the shape of these Washers may be changed, as may also the form of the grids, the insulating-washers, and the manner of building up, without departing from my invention.

I claim 1. In a resistance-panel, a rod or bolt, a metal ring or hub of larger diameter than the rod and surrounding it, and an insulatingwasher threaded on the rod, and engaging the hub to hold it apart from the rod, whereby the use of a long inner sleeve is obviated; substantially as described.

2. In a resistance-panel, a rod or bolt, insulatingwashers threaded upon the rod, and grids having hub portions engaging the Washers and separated from the rod by an airspace; substantially as described.

3. In a resistance-panel, a rod or bolt, insulating-washers fitting thereon, and grids having hub portions interfitting with the washers by means of annular shoulders and recesses; substantially as described.

4. In a resistance-panel, a rod or bolt, insulating-washers fitting upon the rod, grids having hubs surrounding the rod, and metallic spacing-washers, the grid-hubs, and metallic spacers being held away from the rod by nesting engagement with the insulating- Washers; substantially as described.

5. In a resistance-panel, a series of rods or bolts, insulating-washers fitting upon them, grids having hub portions surrounding the rods, and metallic spacing-disks electrically connecting some of the grid-hubs, the spacing-disks and grid-hubs being held apart from the rods by nesting engagement with insulating-washers fitting upon the rods; substantially as described.

6. A resistance-box containing a plurality of resistance units removably hung therein, each unit consisting of a series of grids supported between side plates and being supported and removable from the box independently of the other units; substantially as described.

In testimony whereof I have hereunto set my hand.




Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4630024 *Sep 28, 1984Dec 16, 1986Post-Glover Resistors, Inc.Grid resistor and improved grid element therefor
Cooperative ClassificationH01C3/10