US1890992A

US1890992A - Tackle block

Info

Publication number: US1890992A
Application number: US537849A
Authority: US
Inventors: Charles F Janssen
Original assignee: Individual
Current assignee: Individual
Priority date: 1931-05-16
Filing date: 1931-05-16
Publication date: 1932-12-13
Anticipated expiration: 1949-12-13

Description

Dec. 13', '1932. JANSSEN 1,890,992

TACKLE BLOCK Filed May 16, 1951 2 Sheets-Sheet l lNVENTOR UZQIYJF/ZSSE/Z ATTORNEY Dec. 13, 1932, c. F. JANSSEN TACKLE BLOCK Filed May 16, 1931 2 Sheets-Sheet 2 C/zar/e Patented Dec. 13, 1932 Y UNITED STATES PATENT OFFICE CHARLES E. J'ANSSEN, OF AsToRIA NEw YORK TACKLE BLOCK Application filed May 16, 1931. Serial No. 537,849.

This invention relates to hoisting devices in section, showing my rope arresting device of the block and tackle type in general, and in operative position. particularly to the kind known as self-lock- Fig. is a similar partial side elevation of ing in which a cord, cable, rope or the like the block, with the rope arresting'means in 5 is permitted to unrestrictedly move or travel rope engaging position. a 55 in one direction, While it is automatically Fig. 6 is a top view of the block, with the gripped and firmly held when its motion is able arresting device in plan view.-

reversed, and which grip hold may be in- Referring now specifically to Figs; 1 and stantly released through a slight pull upon 2, numeral 10 is conventional, double pulley 10 the gripping provisions. tackle block, to which is attached by means 60 The prime object of my invention resides of cable, thimble 11 of cable or rope 12. Bein providing in connection with a hoisting 10W lock 10 is arranged a double pulley device of this kind employing cord, rope or tackle block 13 of my special construction, the like an automatically operable and manuwhich consists of cheek members 14, pointed i 15 ally releasable rope gripping device which is a their lower ends, while their upper ends 6 so constructed as to normally have the tendare w ened up. ency of positively engaging the rope while On observing Fig. 2, it will be seen that the the latter is either in motion in one direction, left hand upper corner 15 is somewhat lower or at standstill, and to actually grip and hold h n the left hand upper corner '16 of the a the rope or the like against movement when cheeks. A conventional strap 17 passes about the otion of th o i r r d, the cheeks and provides suspension means for Another object of my invention is to prohook 18. vide in connection with a hoisting device of The arrangement of my cable locking dem this kind a block with specially designed Vice may be best understood from Figs. 3, 4, cheeks adapted to engage the outer surfaces 5 n 6, wh re sheave pin 19 is shown pass- 75 of a rope or cable, and a, rope or cable, brake 111g tllIOIlgll .strap 17 which extends above centrally disposed between the cheeks and the ve t0 the upper center of the cheek the inner surfaces of the cable for locking the members 14, where another pin 20 is secured. n latte i l Between the cheek members, and disposed A still further object of my invention is to at h l w r c rner 15 and the upper corner provide with said cable brake a releasing 16 BI Of, are

Spa ers

21 and 22 respectively, lever, operable manually from without the Whifih a g d at different levels. They bl k h k d id d with spring conare held in position by rivets or other suitable trolled ean for k i g th l d means and their inner surfaces are hollowed thereby the cable brake in a position at which out as le rly en in Fig- 6, at 23 for normalthe latter will always engage, or have the y aq mrlmedatlng a rope or cable, and for tendency to engage the inner surfaces of the faclhtatmg ms pp as Wlubeexplalned cable. P e y- The foregoing and still further objects of plvotauy moulged t upper pm my invention will become more fully apparg 'i cheliqklmem 14 1S rlnybcable fif ent from the following description, and the evlce compnses m 24 W lch tends at both ends and su ort b th 'd s p t l formmg Part of thls jaws or gripping members prbvfded vivit h V bpec} i and m whlchz hollowed-out engaging faces 26, adapted to 4.) Fig. 1 1s an end elevatlon of my hoisting grip the inner Surfaces of the Cables. vFrom f cQnstrllcted as Present Preferredthe center of hub 24 extends over the lower l a slde elevatlol} theleofspacer 21 an operating lever 27, equipped Flg. 3 IS a front QlGVflt-IOH Of 2111 enlarged with a rope engaging QVQQ8 andproviddetail view of my tackle block. ed with a spring controlled pin 29, intended 50 Fig. 4 is a side elevation thereof, partially to bear against spacer 21 and normally push lever 27 into upward position, thereby causing the jaws of gripping members 25 to be steadily in a so to speak dragging engagement with the cable strands.

Pin 29 may be adjusted by means of a screw cap 30, whereby the tension of the spring bearing against the pin may be regulated.

Associated with eye 28 of lever 27 is a pull rope 31, which, when operated, causes lever 27 to swing downwards, as shown in Fig. a, whereby the jaws of cable gripping members 25 are brought out of engagement with and into cleared position relative to the cable portions.

When pull rope 81 is released, and when the movement of the cable is reversed to that at which a load is hoisted by the device, gripping members 25 will immediately wedge the cable portions against stationary gripping or spacer members 22, as illustrated in Fig. 5, and lever 27 will swing upwards. The function of my device is automatic and prevents back-slipping of the cables during hoisting operation, or when the such operation is temporarily stopped.

Reverting again to Fig. 1, I have shown that the cable extends from thimble 11 downwards, passes over left hand sheave of the lower block, then upwards to and over the left hand sheave of the upper block, then downwards again and over the right hand sheave of the lower block, and up and over the right hand sheave of the upper block. From that sheave the cable extends outwards and forms the engaging or operating end 32.

One of the outstanding advantages of my arrangement resides in its safety. Assuming that the cable breaks at any point, the gripping members 25 will immediately function and engage the cable portions remaining in the lower block and lock them against further movement, thereby preventing the load from falling and causing damage or injury to the operator.

While I have shown a specific form of my double sheave device, triple, quadruple sheave blocks, and other changes and improvements may be readily incorporated, and I therefore reserve for myself the right to make such changes and improvement within the broad scope of my invention, as set forth in the annexed claim.

I claim:

In a multiple sheave block, a pair of cheek members, a plurality of stationary cable engaging spacers, a plurality of pivotally mounted cable gripping members operatively located between said spacers and forming one movable unit, a releasing arm extending from the unit, a spring controlled member slidable in a recess in said arm and bearing against one of said spacers and adapted to normally elevate said arm, thereby keeping said cable gripping members normally in light engage- CHARLES F. JANSSEN.