US1511030A - Sheave lock - Google Patents

Description

oct. 7, 1924. 1,511,039

H. C. DINDINGER sHEAvE'LoCK Filed D ec. l1 1932 Patented Oct. 7, i924.

isms

HARRY C. DlNDNGE/f, Gil? MG'LlTE, ILLINOIS.

sirnavn 'Loon Application filed December l1, 1922. Serial No. 606,074

.T all whom t may concern.'` c

Be 'it known that I, Hanni' C. DINDINGER, a citizen of the United States, residing at Moline, in the county of Roel; island and State of illinois, have invented a certain new and useful mproveniient in a Sheave Loch, of which the following is a full, clear, and exact description, reference being had to the accompanying` drawings.

This invention is concerned with means for locking av rope or cable to a sheave and has for one of its objects the provision of a simple and efficient locking mechanism which may be satisfactorily operated on ropes or cables of various sizes.

i-in additional object includes the construction of a locking mechanism which may be readily actuated by swinging the free end of a cable relatively to the sheave, and without slacking the free end during. the swinging operation.

A stil-l further object is the provision of a locking device which may be so mounted uponf-the frame' which supports the sheave so that the cable may be pass-ed over the sheave without necessitating a threading of the 'free end of the cable-between the sheave and fram-e.

In carrying out my invention, I employ a brak-e shoe or locking dog, which is mounted to swing over a pulley sheave and` against the rope or cable which travels over the sheave, and mount the mechanism for actuating the shoe upon a frame in which the pulley is carried.l The directionl in which the shoe is movable for locking. purposes is the same as the direction of pull on the cable, whereby the shoe tends to remain in loclredlposition. To facilitate the operartion of the shoe I so arrange the actuating mechanism that the free end of the cable or rope may be used as a lever to control vthe position of the shoe.`

The means for carryingv out the above objects will be more fully set forth in the following description, whichv pertains to the accompanying drawings, and the lessential characteristics will be summarized in the claims.V v

In the drawings, Fig. 1 isa side elevation of a sheave havingy a lock associated therewithembodying my invention.; Fig. 2 is a similar -view showing the lock in open position; Fig. 3 is asection taken through the lock on the line 3-3 in Fig. l; while Fig.

particularly a is a longitudinal section taken on the correspondingly numbered line in Fig. 3.

In the various figures, I have shown a sheave which is rotatably mounted upon a. shaft l1, which in turn is journaled ina frame. This frame is shown as a U-shaped member having sides land 14, which straddle the sheave and provide a suitable support for the looking mechanism as will be hereinafter described. @ne side of the frame, as at 14C, may be extended beyond the locking mechanismand be provided with an enlargement l15. In the enlargement l have shown an' opening 16 together with a retaining pin 17 for holding the sheav'e in a convenient support 18, as indicated in Fig. 1.

The frame supporting the sheave also carries the loch. This lock comprises a shoe 19 which is pivotally mounted, as at 20, l'to a locking lever 21. This shoe is arranged Vto be moved relatively tol the sheave and to be turned during such movement in such manner that the clamping face 22 remains parallel to vthe periphery of the sheave. To effect this movement, l have shown the shoe as having an extension 23j, which is pro5- vided with a slot 24:. This slot co-operates with the shaft 11 to maintain the clamping face of the'shoe parallel to the sheave whenever the looking lever 21 is moved relatively to the sheave. Thetwopositions of the shoe showing the movement of the slot 24 is shown in F ig. 4 at 24 and 24a.

The locking lever which supports the shoe is shown as an irregularly shaped member which is formed at one end, as at 25, to receive the pin 2O and at the other end, as at 26, to receive a shaft 27 which is carried by the sheave frame. l have shown this lever rigidly attachedy to the shaft 27 by means of a pin 28, and I have also shown a spring 29 which surrounds the lower part of 1lhe locking lever and is attached at one end to the lever and at the other end to the frame so as normally to urge the locking lever into clamping position. This position is Ashown inv full lines in Fig. il. A

To permit movement of the locking lever with relation toithe sheave, l provide an arcuate slot 30 through which the shaft'll extend. Tn this way', arcuate movement of the llocking lever is limitedl and is controlled for receiving various sizes of ropes which pass over the sheave.

W ith the mechanism heretofore described., a cable B which passes over the sheave is normally locked by the spring 29. Accordingly, to release the cable it is only necessary to move the looking lever 2l against the force of the spring to the position indicated by the broken lines in Fig. 4. To accomplish this movement without necessitating considerable inconvenience and power, T provide a mechanism which may be actuated by a single swinging movement of the free end C of the cable.

The. means for actuating the locking lever 2l is shown as a rock lever 35 which is pivotally mounted on the shaft ll outside the sheave fiame and is bifurcated, as at 36,

to receive` the crank arm 37 which may form an extension of the shaft 2T. The outer endl of this rock lever carries a pin 38 which moves in an arcuate slot 39 in a tripping lever 40. This tripping lever is shown as pivoted at 4l to the side 14 of the frame. The free end of the tripping lever extends beyond the sheave and may be provic ed with a pair of oppositely disposed cable guides 42 and 43 which extend inwardly toward the sheave. Assuming that the cable B is placed around the sheave, and that the free end C is inserted between the guides on the tripping lever, and further that the shoe is in locked position as shown in Fig. l, then to release the cable it is only necessary to swing the tripping lever in the direction indicated by the arrow Dv in Fig. l. This is accomplished by swinging the free end of the rope which passes through the guides. liVhen the tripping lever is swung as indicated, their the pin 38 is raised by the slot 39 whereupon the forked end of the roc-lr lever is swung from the position indicated in Fig'. l., to the position indicated in Fig. 2. Thus the crankI arm 37, locking lever 25, and shoe i9 are simultaneously moved downwardly' and are maintained in such position, until the cable is swung baclrwaidly to the position indicated in llig. l. Since the load is in the direction indicated by the arrow l in the various figures, then as soon as the free end of the cable is swung baclrwardly to its original position, the shoe is brought into contact with the cable in a direction correspo'iding to that of the load. Thus the brake shoe is moved to locking position whenever the area of contact between the table and sheave is decreased and is released whenever the area of Contact is increased.

rin advantage of a sheave loclr'constructed according to my invention isthat the cable may be placed over the sheave without threading the free end thereof through the frame. This follows by reason of the fact that the side 13 of the frame terminates short of the periphery of the sheave, and also for the reason that the locking shoe, together 'the free end of the member and connecte with the associated mechanism, is carried by the opposite side of the frame. vThis .is particularly useful whenever it is desired to use the lock for holding comparatively long cables.

l claim l. lin combination, a sheave, supporting frame therefor, a locking shoe mounted on the frame and moi/able relatively thereto, and means for maintaining the clamping face of the shoe concentric to the periphery of the sheave during such movement.

9,. fin combination, a sheave, a brake shoe movable toward and away from thc sheave, means for maintaining the clamping face of the brake shoe during such movement concentric to the perilgihery of the sheave, a .tiexible load supporting member passing over the sheave, and mechanism engaging d with the shoe whereby variations in the area of Contact between the member and sheave effect relative movement between the shoe and said sheave.

3. In combination, a sheave, a supporting frame therefor, said frame having one side open, and a locking shoe movable relatively to the sheave and frame, and means for mounting the shoe on the frame to permit a flexible hoisting member to be passed over the sheave adjacent the open side of the frame without threading the free end of the member through the sheave.

4. Tn combination, a sheave, a frame therefor, a lever pivotally mounted on the frame, a brake shoe associated with said lever, and meansassociated with the lever for retaining the clamping face of the shoe concentric with the periphery of the sheave whenever the lever is moved relatively to the frame.

5. Tn combination, a sheave, a supporting` member therefor, a lever pivoted to said member remote from the axis of said sheave, a shoe carried by said lever, a second lever cooperating with the first mentioned lever for controlling the operation of said shoe, and means for normally urging the first lever so as to bring the shoe into locking position.

6. Tn combination, an open sided frame, a sheave journaled therein, a lever pivotally mounted within the frame beyond the periphery of the sheave, a brake shoe carried by the lever at the side of the sheave opposite the pivotal connection of said lever, and means for urging the shoe into locking position.

7. In combination, a sheave, a supporting frame therefor, a brake shoe mounted within the frame, and mechanism including a pair of cooperating levers for swinging the brake shoe relatively to the sheave.

8. In combination, a sheave, a supporting frame therefor, a lever pivotally mounted llt) CJD

to swing within the frame, a brake shoe carried by the lever, and mechanism including members having pin and slot connections for actuating the first mentioned lever to operate said shoe.

9. In combination, a frame, a sheave journaled in said frame, a brake shoe, a rock lever pivoted to the frame so as to swing about the axis of the sheave, means whereby the free end of the cable passing over the sheave may actuate one of said levers, and mechanism controlled by the other end of said lever for moving said shoe relatively to the sheave.

10. In combination, a frame, a sheave journaled therein, a fieXib-le load engaging member passing over the sheave, a lever having one end thereof pivotally mounted on the frame, a brake shoe carried by the other end of the lever and adapted to clamp said member to the sheave, a rock lever pivoted to said frame and operatively connected with the shoe carrying lever, and a tripping llever operatively connected with the rock lever, whereby movement of said rock lever in one direction effects a corresponding movement of the shoe relatively to the sheave.

l1. In combination, an open sided frame, a shaft extending therethrough, a sheave journaled onthe shaft within the frame, 'a lever pivotally mounted on the frame and having an arcuate slot co-operating with said shaft for limiting the movement of the lever relatively t0 the frame, a brake shoe caried by the lever, said shoe having an extension projecting beyond the shaft and intermediate the lever and sheave, said extension having a slot co-operating with said shaft whereby movement of the lever relatively to the frame maintains the clamping face of said shoe concentric to the periphery of the sheave. Y

l2. In combination, an open sided frame, a shaft extending therethrough, a sheave journaled on the shaft within the frame, a lever pivotally mounted on the frame and having an arcuate slot co-operating with said shaft for limiting the movement of the lever relatively to the frame, a brake shoe carried by the lever, said shoe-having an extension projecting beyond the shaft and intermediate the lever, said extension having a slot co-operating with said shaft whereby movement of the lever relatively to the frame maintains the clamping face of said shoe concentric to the periphery of the sheave, a rock lever pivoted on said shaft outside the frame, said rock lever being operatively connected at one end withfthe shoe carrying lever, and means whereby the free end of a load engaging member passing over the end of the sheave may actuate the rock lever to control the operation of said shoe. p

13. In combination, an open sided frame, a shaft extending therethrough, a sheave journaled on the shaft within the frame, a load engaging member passing over the sheave, a lever pivotally mounted on the frame and having an arcuate slot co-operating with said shaft for limiting movement of the lever relatively to the frame, a brake shoe carried by the lever, said shoe having an extension projecting beyond the shaft and intermediate the lever and sheave, said extension having a slot co-operating with said shaft whereby movement of the lever relatively to the frame maintains the clamping face of said shoe concentric to the periphery of the sheave, a rock lever pivoted on said shaft outside the frame, said rock lever being operatively connected at one end with the shoe carrying lever, a tripping lever having one end pivoted to the frame and having the free end formed to receive the free end of the load enga-ging` member,

and means connecting the rock lever and tripping lever whereby movement of the free end of the tripping lever controls the operation of said shoe.

In testimony whereof, I hereunto aflix my signature.

HARRY C. DINDINGER.

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