US1359046A - Insulated pulley-block - Google Patents

Description

" J. H. FLYNN, 1R.

INSULATED PULLEY BLOCK.

APPLICATION FILED MAR. 11. 1920.

1,359,04 Patented Nov. 16,1920.

2 SHEETS-SHEET I.

(26.3 l NVENTOR 1. H. FLYNN, JR.

INSULATED PULEEY BLOCK.

APPLICATION FlLED MAR. 11, 1920.

Patented Nov. 16, 1920.

2 SHEETS-SHEET 2.

JOHN H. FLYNN, JR, or CINCINNATI, OHIO.

INSULATED PULLEY-BLOCK.

Application filed March 11, 1929.

To all whom it may concern:

Be it known that I, JoHN H. FLYNN, Jr., a citizen of the United States, residing in Cincinnati, in the county of Hamilton and State of Ohio, have invented new and useful Improvements in Insulated Pulleylfilocks, cl which the following is a specification.

An object of my invention is to produce a pulley block especially adapted to be used by electric workers such as linemen in the stringing or repairing of trolley wires and the like, wherein the transmission of current through the blocks or ropes when wet, is overcome, thus avoiding the possibility of electrocution.

This and other objects are attained in the block described in the following specification and illustrated in the accompanying drawings in which Figure 1 is a perspective View of a block of the single sheave type embodying my invention, part being broken away for purposes of illustration.

Fig. 2 is an enlarged perspective view of a detail of the single sheave block shown in Fig. 1.

Fig. 3 is a perspective view of a detail of a double sheave block embodying my invention.

Fig. 4 is a perspective view of a detail of a triple sheave block embodying my invention.

F 5 is a perspective view of a detail of a quadruple sheave block embodying my invention.

Fig. 6 is a perspective view of an overhead trolley wire system, illustrating the use of my improved insulated blocks in the repairing of broken wires which are highly charged.

The single sheave type of block shown in Figs. 1 and 2 has a block body 7 which is molded of a strong material of insulating characteristics, there being a hook support ing looped member 8 molded in the upper end of the body and thimble supporting members 9 and 10 molded in the lower part of the body. A hook 11 is located in the loop at the upper end of the loop member and a bolt 12 in the lower ends of the thimble supporting members supports a thimble 13. The body-embedded ends of the loop member 8 have transversely extending lugs 14, 15, 16 17, which are spaced from.

Specification of Letters Patent.

Patented Nov. 16, 1920. Serial No. 365,022.

correspondingly shaped transversely extending lugs l8, 19, 20 and 21 on the thimble supporting members 9 and 10. Between the lugged ends of the looped and thimble supporting members the journal pin 22 of a sheave wheel 23 is placed in embedded position within the body of the block, wheel 23 being located in a slot 2 1- molded in the body.

In the position of the journal pin it will be observed upon reference to Fig. 1 that it is spaced from bot 1 the loop and thimble sup porting members and also that the member 8 does not touch members 9 and 10. Thus there can be no possibility of the transmission of an electric current through the block with the consequent liability of. electrocution or severe shock such as is possible in the present block construction now used.

In Fig. 3 the metal hook and thimble sup porting members 25, and 26, 2'7, and 28 for a double sheave block are shown, and in Fig. 4 the hook and thimble supporting members 29 and 30, 31 and 32 of a triple sheave block are shown, the body-embedded ends of the members in each construction being provided with lugs as in the previously described single sheave construction. Fig. 5 shows a quadruple sheave block metal member construction, the hook members 33, 34 and 35 of which are complemented by two thimble supporting members 36 and 37. In Fig. 6 I have shown an application of blocks and tackle to an overhead trolley wire which has broken and the ends of which are being drawn together to oin them. .n this operation the wire grippers 38 and 39 being made of metal and being connectet with the blocks 40 and 41, when such blocks are of the usual all metal type, permit the transmission of electric current through either defective insulators 41 holding the live wires 41 or through the rope 42 when, during a rain or sleet, the rope becomes wet. This has caused severe shocks and the loss of many lives through the lack of properly insulated pulley block construction of some kind. Now when such blocks are of a construction such as I have described as embodying my invention, there can be no possibility of such fatalities occurring inasmuch as there is no direct metal connection from the wire to the rope and by making the block body of a suitably hard insulating material there can be no absorption. of current con g p es Which could be transmitembedded within the insulating material, ted by a Water soaked rope or defective insua looped hook supporting member emlators holding live wires. bedded within the insulating material at Having thus described my invention what the upper end of the body and spaced from 5 I claim is r the pin and a thimble supporting member 20 1. An insulated pulley block comprising a embedded within the insulating material at body of insulating material, a sheave journal the lower end of the body and spaced from pin embedded within the insulating mathe pin, the members being spaced from terial, a hook supporting member embedded each other.

10 Within the insulating material and a thim- In witness whereof I aflix my signature in 25 ble supporting member embedded within the the presence of two witnesses. V insulating material, the members being JOHN FLYNN, J n. spaced from the journal pin. Witnesses:

2. An insulated block comprising a body W. T. SMITH,

15 of insulating material, a sheave journal pm W. J. SOHULTZ.

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