US1749515A - Pulley block - Google Patents

Description

March 4, 1930.

H. SLEEMAN PULLEY BLOCK Filed May 9, 1927 Patented Mar. 4, 1930 HAROLD SLEEMAN, OF IRON RIVER, MICHIGAN I PULLEY BLOCK Application filed May 9,

This invention relates to pulley blocks and, more particularly, to those which are adapted to permit the introduction of the rope or cable,

or its removal, by a sidewise movement, in-

" stead of having to thread it through the block.

The objects of my invention are, first, to provide an improved pulley block having a shell comprising duplicate cheek plates which cover the sides of the pulley and are widest loat their tops and have sloping or inclined edges which prevent the rope or cable from sawing on the edges ofthe pulley block and which cause the block to automatically aline itself in relation to its work, regardless of the angle at which the rope or cable leaves and enters the block by reason of the co-operation of the inclined edges with the rope; second, to provide a pulley block having relatively rotatable side plates, respectively having imzo proved cheeks which, collectively, act as spacers to'prevent the sides from binding on the sheave and'also as retainers for the rope or, cable when in normal position but being adapted for relative turning to provide an '25 opening through which the rope or cable may be introduced tothe sheave or removed from it by a sidewise movement; third, to dispense with catches, dogs, and other mechanical elements which are liable to get out of order or so to become lost or misplaced which have been used inearlier pulley blocks in order to permit sidewise introduction or removal of the rope or cable and, instead, to provide an improved construction enabling ropes to be easily any kind; fourth, generally, to provide an I improved pulley block which will always retain the rope or cable on the sheave,prevent it from sawing crosswise of the pulley block and to enable the pulley block to be used at any angle without possibility of the rope.

. binding-or becoming detached from the block.

In' the accompanying drawings I have illustrated certain embodiments of the different improvements comprising my invention but it is to be understood that other modifications will fall within the general spirit and principle of the invention.

In the accompanying drawings:

Figure 1, is a side elevation of a pulley changed without requiring the use of tools of 1927. Serial no. 189,926.

block whose sides are fixed in relation to each other but which embodies that part of the invention where the block is widest at its top;

Fig. 2, is an'end elevation thereof;

Fig. 3, isa side elevation of another form of the pulley block, embodying relatively rotatable sides and a locking yoke;

Fig. 4 is an end elevation thereof, the sides being closed;

Fig. 5, is a similar View, one of the sides having been turned and the yoke swung back to permit the introduction or removal of the rope; I

Fig. 6, is an end elevation of another embodiment, opened for the introduction or removal of the rope, this form being provided .with duplicate hooks on the sides;

Fig. 7, is a side elevation of the modification shown in Fig. 6; and

Fig. 8, is a side elevation of a modification of the construction embodied in Figs. 6 and 7, illustrating how the wider top of the sides and the spacers and retainers may be curved, instead of straight. I

In all of the embodiments of the invention which are illustrated, the sides 1 and 2 substantially cover the pulley, are widest at their tops, where the hook that is used to anchor the pulley block is located, and have sloping edges which insure the returnof the rope or cable L to the pulley should the rope tend to divert from the plane of the pulley block, and preventkthe rope from sawing on the pulley bloc The purpose of this construction is to cause 1 the pulley block to automatically aline itself with its cable or rope and its work regardless of the angle at which the rope leaves and enters the block.

-In Figs. 1 and 2, the sides 1 and 2 are rigidly connected by the top 3 but in all of the other forms of the invention which are illustrl'jated, the sides 1 and 2 are relatively rotata le.

Suitably swivelled in the top 3 is a hook 4 by which the'pulley block is anchored wherever it may berequired for use. The pin 5 on which the pulley or sheave 6 is rotatably mounted, is provided with a cotter 7 to prevent-its detachment and it has a headed pm 8 passing therethrough whose head 9 engages the side 2 for the purpose of preventing the pin 5 from rotating.

In the form shown in Figs. 3 and 4 the sides 1 and 2 are separate and are relatively rotatably mounted on the pin 5. Either one of the sides may be turned, as illustrated in Fig. 5, when it is. desired to change the rope. The sides land 2 have metal straps 10 suitably riveted or secured thereto which are provided at their outer ends withzeye's 11;. J 1 p A yoke 12 to which the hook 4 is swivelled, has eyes 13, and there are pins 14 which pass .through the eyes 11 and 18 to lock the sides and prevent the rope from binding or becoming'detac hedfrom the sheave, When one of the sides is swungaround and the yoke 12 is thrown back as shown in Fig. 5, a space'17 is provided through which the rope may be passed ina sidewise direction either to insert it in thepulley block or to remove it, thus obviating the necessity of threading the rope through the block. e

.The curved inner surfaces 18 ;of theretainers 16 prevent any chafing on the rope.

The parts 16 may be integral with the sides 1 and 2 as shown in Figs. 3, 4', and 5, or they may be separately constructed and suitably.

attached to said sides by rivets 19 or other fastenings as illustrated in Fig. 6.v

Theretainers 16 also, serve, as spacers as they will, by their contact, prevent the sides in use. The hooks 4 are preferably carried by;

1 and2 from pressingagainst and binding on the sides of the sheaves 6.

In order to open the pulley block it is only necessary to withdraw one of the pins 4 and tod swing backthe yoke 12 and rotate the si e 1.

In the construction shown in Figs. 6 and 7 the yoke 12 and the pins 14.- and straps 12-are dispensed with and each of the sides 1 and 2 is provided with a hook 4 which, collectively, cons'titute'a double hook when the sides 1 and 2 are in their normal position. It is .not neces sary, to provide in 7 this construction," any means forlockingthe sides together because the hooks are both anchored, in side by side" arrangement, when the block is closed and is straps which are suitably secured,as by rivets 20 to the sides 1 and 2. The sides 1 and 2 are provided with combined rope retainers and spacers 16 extending across the-wider tops thereof, as with the construction shownin Figs'3', 4, and .5. and these combined-retaim;

ers and spacers serve the same purpose as previouslydescribed.

In the construction shown in Figs. 6 and. 7 there is no pin to remove or replace, but all that is required to open the block is to detach the hooks from their anchorage and swing back either of the sides into the reversed position shown in Figs. 6 and 7, whereupon the rope may be changed. When the rope isagain in position, the sides are swung aroundto bring them' into alinement and the hooks are then side by side so that the pulley may be anchored and used.

In Fig. 8 I. have illustrated how the tops 'of the sides 1 and 2' may be curved and the combined retainers and spacers may be curved, instead of straight, asin Figs.;'3 to 7 inclusive. I I 7 g p The combined retainers and spacers 16 should, preferably, extend clear across the sides 1 and 2 from one'edge to the opposite edge thereof. q I I lVhatI claim is: I 1. A pulley block comprising a pulley, rel.- atively rotatable sides substantially covering the sidesof the pulley and which are provided. on their inner walls with combined rope retainers and sidespacers adapted, collectively.

to overhang the pulley, said sides being .Widest at.,tl1eir tops and having the aforesaid retainers and spacers: extendingsubstantially across said: sides at their widest tops to prevent the ropefrom sawing laterally across.

.the pulley, and h'ookmeans carriedby the.

widest topsofthe sides for anchoring the.v pulleyblock'and for keeping the sides in alinement with therope retainers and spacers facing each other for the purpose of collectively overhanging the pulley.

2;: A pulley block comprising a pulley, a; bearing pin on which said pulley is mounted,

side plates through which the pin passes and I which are'located on opposite sides of the pulley, said side plates being widest at their tops and mounted onsaid pin for alinement or relative turning, combined rope retainers and spacers extending across the wider tops of the side plates and adapted to face each other and overhang the pulley when the side 1 plates are in closed position, hook meansbe- Y ing provided for-the side plates to hold them in closed position and to anchor the pulley block, and av headed'p-in attached to the bean" ing'pin' and serving as a means for securing one ofi the side platesto the bearing pin to I prevent the bearing pin from turning. Intestimony whereof Iatfixmy signature. J HAROLD SLEEMAN.

Images