US3507975A - Transformer-mounting frame - Google Patents

Description

April 21, 1970 'J, H, scoff I Y $507,975

' TRANSFORMER-MOUNTING FRAME Filed Jan. 27, 1969 2 Sheets-Sheet 1 memmmuau a] April 21., 1970 J, H, so 3,507,975

TRANSFORMER-MOUNTING FRAME Filed Jan. 27, 1969 2 SheetsSheet 2 i JAME'S H scar ;I B 49 W1. Aime/v5) United States Patent O 3,507,975 TRANSFORMER-MOUNTING FRAME James H. Scott, Hacienda Heights, Calif., assignor to Scott Engineering, Inc., Temple City, Calif., a corporation of California Filed Jan. 27, 1969, Ser. No. 794,244 Int. Cl. F16m 13/02; H01f 15/02 US. Cl. 174-40 6 Claims ABSTRACT OF THE DISCLOSURE A rectangular frame having horizontal, parallel, upper and lower bracket arms with rearwardly angularly bent ends, and an insulator transformer-mounting block secured to each said arm end and intermediate said arm ends to provide three pairs of mounting blocks, each pair being adapted to mount a transformer, the frame, at each intermediate portion of the arms, having a bracket for connection with vertically spaced cross bolts on a pole for mounting the transformer-provided frame.

BACKGROUND OF THE INVENTION Field of the invention The mounting of as many as three electrical transformers on a pole, each transformer frequently as large as 35 /2 inches in diameter and weighing up to fourteen hundred pounds.

Description of the prior art It is common practice to raise each transformer of a plurality thereof individually to its position on a pole; the securing means for each said transformer, in the aggregate, weakening the pole due to the multiplicity of bolt =holes required; such individual moutings cause an imbalanced condition, since each transformer directly subjects the pole to its own weight and balance or lack of balance; direct mounting of the transformers on steel brackets in instances where such are used on an individual basis; heavy transformers subject to side sway due to lack of stability at the connection of the transformer-mounting cross arm with the pole; limited space for mounting three transformers; inflexibility of mounting transformers of two different heights.

SUMMARY OF THE INVENTION A rectangular frame 10 which, while disposed on the ground, may be pre-assembled with three large electrical transformers, the frame mounting a plurality of pairs of insulator blocks 11, 12 and 13 which may be selectively adjusted to mount three- phase transformers 14, 15 and 16 of two different heights, and the frame being provided with vertically spaced support connections 17 for engagement with similarly spaced bolts 18 provided on an elevated portion of a power pole 19, the frame 10, with the transformers assembled thereon, being adapted to be raised as a unit by a suitable hoist so the connections 17 on said frame may be engaged with extending ends of the bolts 18 and the latter then tightened to effect a firm connection of the transformer-mounting frame with the power pole.

BRIEF DESCRIPTION OF THE DRAWINGS In the drawings, like reference characters designate similar parts in the several views.

FIG. 1 is a plan view, partly in section, of a transformermounting frame according to the invention.

FIG. 2 is a partly broken rear view thereof.

FIG. 3 is an enlarged view of the outer face of a section of one of the insulator blocks shown in FIGS. 1 and 2.

Patented Apr. 21, 1970 DESCRIPTION OF THE PREFERRED EMBODIMENT The frame 10 comprises, generally, two vertically spaced, horizontally disposed cross arms 20, and a pair of vertical braces 21 afiixed, as by bolts or riveta 22a to said cross arms so the frame has a generally rectangular form with the ends of the cross arms extending laterally from the braces 21, as best shown in FIG. 1. The cross arms 20 are preferably of channel form and the braces 21 are preferably formed as angles, although the cross-sectional forms thereof may vary. As best shown in FIG. 1, the ends of the cross arms 20, beyond where the braces 21 are secured thereto, are directed at a rearward angle relative to the extent of the intermediate por-.

,- tions of said arms, thereby providing each said cross arm with an intermediate front mounting surface 22 and oppositely angle mounting surfaces 23 at the opposite ends of the cross arms.

Although the upper ends of the braces 21 are broken off, the same may be extended to any desired length and serve as hoist-engaging portions whereby the pre-assembled frame and transformers may be lifted to mounted position on the upper end of the power pole 19.

The insulator blocks 11, 12 and 13 are mounted on the mentioned front surfaces of the cross arms 20, as above described, each said block being formed to have a base portion 24 that is affixed to the cross arms by bolts 25' or similar fasteners, and a narrower portion 26 extending from the base portions 24 preferably at right angles to the respective mounting surfaces 22 and 23 of the cross arms.

The insulator blocks are preferably molded of a rigid plastic material, of which ABS resins (acrylonitele-butadiene-styrene), especially effective as electrical insulation, is an example. As best shown in FIGS. 3, 4, 5 and 7, each block is formed of two similar sections 27, reinforced by a system of ribs 28 on their outer faces and provided on their mating inner faces with longitudinal recesses 29. Said blocks have increased rigidity, i.e., resistance to flexure, particularly longitudinally, by reason of the provision of steel rods 30 fitted into the spaces formed by the recesses 29' when the block sections are assembled and bolted to the cross arms 20. In practice, the bolt holes 31 in the block sections of the mounting blocks are longitudinally spaced from a mounting hole 32 a distance equal to half the difference in length between the 1l%" and the 23%" single-phase transformers commonly used. FIGS. 2 and 6, in full lines, show the insulator blocks mounted to connect, by means of bolts 25a, with the mounting brackets 33 of the shorter of the two sizes of transformer. The dot-dash line position of the block at the lower portion of FIG. 6 shows the block turned end-for-end so the lower bracket 33a of one of the longer transformers may be secured as by a bolt 25 to the extending end 26 of the mounting block.

The block sections 27 are preferably lightened, as above described, but need not necessarily be so treated, as indicated in FIG. 2, where said ribs are omitted.

The support connections 17 are shown as brackets 34 that are generally W-shaped, as best shown in FIGS. 1 and 8, and which are preferably welded to the middle portions of the cross arms 20. Regardless how otherwise shaped, each such bracket is formed to have a middle plate part 35 that is welded to and spans across the flange edges 36 of the channels of which the cross arms are formed. A bottom-open recess 37, with leadin corners, is provided in each said plate part 35. As best seen in FIGS. 6, 7 and 8, the lower flange of each cross arm is provided with a notch 38 that is aligned with the recess of each respective cross arm. It will be clear, as seen in FIGS. 6 and 7, that the heads 39- of the bolts 18 may pass through said notch so the adjacent portions of the bolts 18 may enterthe recesses 38. Thus, as hereinbefore indicated, the assemblage of frame 10, insulator blocks 11, 12 and 13, and transformer 14, 15 and 16, after assembly on the ground, may be raised to effect hooking engagement with the head ends of the bolts 18, and said bolts tightened to draw the heads 39 thereof tightly against the plate part 35 and the pole 19 into firm seating engagement with oppositely angled plate parts 40 of the brackets 34 with poles of different diameters.

The above-described construction:

(a) Permits three single-phase transformers to be preassembled on the ground, lifted as a unit to mounted position on a power pole, and firmly held in such position against sway;

(b) Uses insulating blocks interposed between the cross arms and the transformers and constituting the means for mounting the latter;

(c) Provides facile reversibility of the lower blocks for mounting transformers of two different heights;

(d) Provides rearwardly bent ends on the cross arms to enable a more compact assemblage of the transformers on the cross arms;

(e) Provides mounting means on the cross arms that permits nesting of the power pole thereinto to enable connection of the cross arms onto poles varying in diametral size and yet retaining the assembly against side sway;

(f) Includes reinforcing rods in the two-section transformer-mounting blocks and minimizes electrical leakage while reducing weight, by use of ribbed surfaces on the outer sides thereof.

While the foregoing has illustrated and described what is now contemplated to be the best mode of carrying out the invention, the construction is, of course, subject to modification without departing from the spirit and scope of the invention.

Having thus described the invention, what is claimed and desired to be secured by Letters Patent is:

1. A frame for mounting electrical transformers on a power pole comprising:

(a) upper and lower parallel cross arms, each arm having both ends rearwardly, angularly and oppositely directed and in paired vertical arrangement,

(b) vertical members connecting said cross arms,

(c) three pairs of vertically aligned transformermounting insulator blocks, one pair fastened to each pair of angularly directed cross arm ends, and the third pair fastened to the mid-portion of the cross arms, and

(d) each of said insulator blocks having an extension directed vertically away from the cross arm to which fastened, each said extension being adapted to be secured to a transformer whereby the extensions of the pairs of blocks engage vertically spaced portions of the transformers.

2. A frame as defined in claim 1 in which the extensions of the transformer-mounting blocks fastened to the upper cross arm are downwardly directed from said cross arm, and the extensions of the transformer-mounting blocks fastened to the lower cross arm are adapted to be selectively directed either upwardly or downwardly from said lower cross arm for corresponding engagement with transformers varying in length, accordingly.

3. A frame as defined in claim 1, characterized by the provision of:

(a) a support connection on each cross arm located on the rearward sides of said crossarms in register with the insulator blocks at the mid-portion of said arms,

(b) each said support connection being provided with a plate part adapted for hooking engagement from above with headed bolts provided on a power pole.

4. A frame as defined in claim 3, characterized by the provision, as part of each support connection, of two oppositely angled plate parts forming a seat for the power pole when the mounting bolts are drawn up when in hooking engagement with the support parts to maintain the.

(c) an elongated metal bar fitted into such registering recesses to stiffen the block.

6. A frame as defined in claim 5, characterized in that the sections, in their opposite outer faces, are provided with strength-imparting ribs that increase the electric surface leakage distance.

References Cited UNITED STATES PATENTS 1,749,252 3/1930 LeBlond 17445 XR 2,175,778 10/1939 MacKinnon 174-45 XR 2,721,961 10/1955 Votaw 3366-8 XR THOMAS J. KOZMA, Primary Examiner US. Cl. X.R.

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