US1810950A - Insulator - Google Patents

Description

June 23,1931. (3, EARHART 1,810,950

I1\"SULATOR Filed April 5 1930 Patented June 23, 1931 PATENT OFFICE ALBERT C. EARHABT, OI CLEVELAND HEIGHTS, OHIO msummon Application filed April 5,

This invention relates to an insulator adapted for use in connection with telephone lines or low tension transmission lines. An object of the invention is to provide qsuch an insulator in which the insulating.

' material used shall be rubber. A further object is to provide an insulator which ma be manufactured very cheaply and whic will nevertheless be well adapted for its in- 1 tended) purpose. A further object is to provide an insulator composed of several "parts in which the parts may be readily and conveniently assembled. Other and more specific objects will appear from the descrip- ,tion and drawin s.

Fig. 1 is a sectional view showing my im proved insulator in position on a cross arm; Fig. 2 is a similar View at right angles to the view in Fig. 1 and showing most of the parts 20 in elevation; Fig. 3 is a plan view; Fig. 4 is a sectional view of the insulating. member removed from the assembly and corresponding substantially to the showing thereof in Fig. 1; Fig. 5 is an elevation of the parts shown 25 in Fig. 4; Fig. 6 is a detail plan view of the ring member; Fig. 7 is a detail elevation of a strap member and Fig. 8 is a detail in perspective of the cap'member. 3

In the drawings I have represented a frag- 80 ment 10 of a conventional cross arm to which my insulator is adapted to be attached. A bolt 11 which may have a nut threaded thereon or which may be a wood screw is employed for securing the upright or supporting member 12 to the cross arm. The member 12 comprises a metal stamping formed with a cylindrical shank portion 13 having the edges abutting and an enlarged end 14 also having abutting edges. The lower portion of member 12 is enlarged to form an attaching end portion having one open side, the edges 15 and 16 being separated to about the width of the enlarged attaching end portion of the member 12. The metal at the lower end of the member 12 is turned in to form a flange 17 which is open at one edge and which may extend between the cross arm 10 and a head of the bolt 11 whereby said bolt firmly 50 clamps the member 12 to the cross arm. It

1930. Serial No. 441,773.

will of course be understood that a difl'erent type of upright or supporting member may be employed, for example, a solid bar having an enlarged upper end and a shoulder adapted to engage the cross arm 10, but I prefer the type shown since it can be produced very cheaply and is in all respects admirably. suited to its purpose.

Adapted to be slipped over the enlarged upper end 14 of the supporting member 12 is a rubber insulating member having a body portion 18 provided with a cavity adapted to receive the supporting member and having a groove 19 adapted to receive aconductor 20 such as a telephone wire. The cavity already mentioned comprises an enlarged portion 21 adapted to receive the enlarged head 14 and a restricted neck portion 22 adapted to snugly receive the shank 13 together with a flaring skirt forming cavity portion 23 which will provide an interruption for a coating of ice or water which might form over the insulator when-it is exposed to the weather. The body portion is also provided with an integral shoulder 24 and such shoulder has a shoulder skirt portion 25 and a shoulder bearing 26 between the shoulder skirt 25 and the body 18. The shoulder has depressions 27 formed therein for the reception of conductor attaching means. The shoulder depressions 27 may be narrowed above the shoulder bearing and widened therebelow as shown in Fig. 2 or it may have a uniform width, as shown in Fig. 5. It will be understood that the relative sizes of the shank 13 and enlarged end 14 as well as the corresponding enlarged cavity 21 and restricted neck portion 22 may be difl'erent from those shown in the drawings and it is contemplated that the relative size will be selected suchthat the greatest ease of insertion may be attained consistent with resistance to any force which might be encountered tending to pull the insulator oii the support 12.

A cap 41 which may be of a semi-cylindrical shape as shown'in Fig. 8 and provided with a complementary groove 31 is provided to cooperate with the insulator 18 to receive the conductor 20 and insulate the inserted through said slots.

member comprises a flat portion,

same from metallic parts. This cap is provided with a plurality of notches 32 in the same face which engages the groove-containing face of the insulating member 18. A strap member 33 is provided having the yoke portion thereof conforming in shape to the cap and provided with legs 34 adapted to be received in the notches 32 whereby the cap and strap may be assembled as a unit at the time of manufacture and in order to secure convenience and installation. The strap 33 is provided with legs 35 extending from the portion 33 and having struck-out barbed tongues 36 at the lower end thereof. These tongues may be resilient whereby they will spring outwardly after being inserted in the notches 37 or they may be bendable and bent to holding position after the strap has been A ring member 38, best seen in Fig. 6, is provided to engage under the shoulder skirt 25 against the shoulder bearing 26 to cooperate with the strap 33 in securing the cap 30 in conductor gripping position on the body 18. This rin a cylindrical flange 39 extending therefrom and projections 40 at the ends thereof provided with the slots 37 adapted to receive the legs 35 and be engaged by the barbed tongues 36 thereof to hold the entire insulator in assembled position. It will be noted that the legs 35 extend along and in the depressions 27 of the body 18.

In assembling my improved insulator in position of use it is only necessary to attach the supporting member 12 to the cross arm 10 by means of bolt 11, slip the rubber insulating portion 18 over the enlarged end 14,

having previously placed the ring member 38 thereon, place the conductor 20 in the groove 19, place the end cap and strap unit in position with the lower ends of the legs 35 extending through the slots 37 to secure the parts in fixed relationship to each other.

From the foregoing it will be evident that I have provided a simple, convenient and cheap insulator which is well adapted for its intended purpose and while I have shown and described certain embodiments I wish it understood that I am not limited to the detailed structure shown but may carry out my invention in numerous varying forms within the scope of the appended claims.

Having thus described my invention, what I claim is:

1. In an insulator, means adapted to have one end thereof attached to a support, the other end thereof being enlarged, a rubber insulating member having a cavity formed therein, said cavity having a restricted neck portion, said enlarged end being received in said cavity and yieldably held therein, and means associated with said insulating member for securing a conductor thereto.

2. In an insulator, means adapted to have one end thereof attached to a support, the

other end thereof being enlarged, a rubber in said restricted neck portion.

3. In an insulator, means adapted to have one end thereof attached to a support, the other end thereof being enlarged, a rubber insulating member having a cavity formed therein, said cavity having a restricted neck portion, said enlarged end being received in said cavity and yieldably held therein, and "means associated with said insulating member for securing a conductor thereto,

said first-means comprising a sheet metal member including a shank portion and an g enlarged end portion having abutting edges and an enlarged attaching end portion having the edges separated and a bottom flange for engagement with a headed attaching means.

4. A rubber insulator-including a body portion having formed therein a cavity, said cavity including an enlarged portion, a restricted neck portion communicating with said enlarged portion and a flaring skirt forming portion continuous with said neck portion, a conductor receiving groove in the end opposite said skirt forming portion and extending thereacross and an intermediate integral shoulder portion, said shoulder portion including a shoulder bearing adjacent the body of the insulator, pressions in said shoulders to receive porions of a conductor securing means.

5. An insulator including a rubber body portion, means for securing the same to a support, a shoulder integral therewith, depressions in said shoulders, a groove extending across one end of said body portion, a ring encircling said body portion, bearing against said shoulder and having slotted projections extending through said depresslons, a cap cooperating with said groove, and a strap passing over said cap and having legs extending along and received in said depressions, said strap passin through the slots in said projections an secured thereto.

6. An insulator including a body portion, means for securing the same to a support, a shoulder integral therewith, depressions in said shoulders, a groove extending across 1 one end of said body portion, a ring encircling said body portion, bearing against said shoulder and having slotted projections extending through said depressions, a cap cooperating with said groove, and a strap there being de-- passing over said cap and. having legs extending along and received in said depressions, said strap passing through the slots in said projections and secured thereto.

7. An insulator including a body portion, means for securing the same to a support, a shoulder integral therewith, depressions in said shoulders, a groove extending across one end of said body portion, a ring encircling said body portion, bearing against said shoulder and having slotted projections extending through said depressions, a cap cooperating with said groove, and a strap passing over said cap and having legs extending along and received in said depressions, said strap passing through the slots in said projections and secured thereto by means of a barb tongue.

8. An insulator including a body portion having a conductor-receiving groove extending thereacross, a cap having a complementary conductor-recelving groove in one face thereof and notches formed in said face, a strap having a portion conforming to a portion of said cap and lugs extending into said notches whereby said cap and strap may be assembled as a unit for convenience in assembling the complete insulator, and means securing said strap to said body portion, there being a shoulder portion integral with said body portion, depressions in said shoulders, a ring having projections thereon and slots in said projections, said straps having legs extending through said slots and secured therein by barb tongues struck out of said legs.

In testimony whereof, I hereunto afiix my signature.

ALBERT C. EARHART.

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