US1167295A - Pulley-block. - Google Patents

Description

J. S. HALL.

PULLEY BLOCK.

APPLICATION FILED DEC. 7. 1914.

1 161295, Patented Jan. 4, 1916.

JOHN SMITH HALL, OF MONTIGELIIO, IOWA.

PULLEY-BLOCK.

Specification of Letters Patent.

1,16? ,295. v Patented Jan. 41;, 19116. Continuation of application Serial No. 835,806, filed may 2, 1914. This application filed December if, 1914.

' Serial No. 875,852.

To all whom itcmay concern:

Be it known that I, JOHN SMITH HALL, a citizen of the United States, and a resident of Monticello, in the county of Jones and State of Iowa, have inventeda new and useful'Pulley-Block, of which the following is a specification.

My invention relates to pulleys of the self-locking type, in which a rope, cord or chain is automatically caught and firmly held, and which may be instantly released by a slight movement of the slack end of the rope either toward or from the pulleyblock.

This application is filed in lieu and in continuation of my application Serial Number 835,806, filed May 2, 1914, which I have abandoned, without, of course, aban doning the invention described and claimed therein and which is hereby and herein reserved and covered.

The principal object of the invention is to provide co-acting locking means which will effectively grip or .bind ropes or cords, or even chains, Without the inclusion of adjustable elements, which latter have been found objectionable, because they are relatively expensive of construction, Weak, prone to disorder and disarrangement, frequently inoperative, and further because it is often diflicult for a novice to effect the proper adjustment. In this connection it may be said tobe another object to attain the lockin result in a more facile, economical and e cient manner than heretofore.

A still further object, and withal a principal one, is to provide a novel non-adjustable locking-shoe which by reason of its peculiar coaction with the locking-dog adapts itself to various conditions, such as larger, smaller, or worn ropes or cords, and even to chains.

A still further object is to provide a novel locking-dog .or lever which is unitary or integral, which does not require assembling, and which is of unique construction.

Another object of the invention is to provide a durable, simple and reliable device, which is economic of construction, for accomplishing the purpose set forth.

Concisely stated, the main object of the invention is to generally simplify and improve the construction of devices of this Considering said drawings in detail, and

referring to each element thereof by a distinguishing numeral, 11 designates a shell or contaimng portion composed of two side plates preferably of identical shape and of any desired material, conforming in a general way to the shape of the parts when attached thereto and having at its upper and lower ends perforations purposed to receive rivets, pins or bolts, 2 and 3 respectively,

these being adapted to join the two plates and hold them in spaced relation to each other. On the rivet 2 may be secured a sing or hook for suspending the block.

A grooved pulley 4 is rotatively attached to the shell by means of a rivet 5 or the like,

and over said pulley the usual hoisting rope 6 is carried and its loose or slack end is passed between the lock-shoe 7 and the dog 8 and threaded through the eye 9 on the lower end of said dog.

The loop-like skeleton shoe 7 secured 0pposite the serrated face of the dog is curvilinear-oblong or elliptical in outline and is pror'ided with a selectively straight or con cave erably constructed as shown in Fig. 1, Where it is shown as secured within said shell by rivets 10 and 11, both of which it embraces. The shoe 7 is merely dropped into place over said rivets and is therefore not rigidly, but loosely held thereon, it being movable relatively thereto and therefore adjustable without the provision of additional means for adjusting it or for holding it in adjusted position. Said shoe is preferably formed of a thin strip of slightly resilient metal folded upon itself to loop over said rivets and. its ends overlapped, as shown in Fig. 1. This construction provides for the smooth or serrated face, but is pref-v easy renewal of. the lock-shoe should it become badly worn, through long usage, or should it be broken.

The locking-dog 8, designed to engage the hoisting rope and force it against the shoe 7 is ogee or substantially S-shaped and has a convex or eccentrically formed and serrated face disposed opposite said shoe, and has an integral eye or rin 9 horizontally positioned at its lower en Said dog is pivotally mounted between the two plates forming the shell by means of a rivet or the like, 12, which rivet passes through a suitable aperture provided at the upper end of the do and through both of said plates. This p acement of the dog relative to the shoe is such that when a rope, cord, or chain is interposed between their proximal faces and threaded through the eye 9, reaching thence down to the hand of the operator, a slight movement of the hand to pull said cord'outward or inward respectively engages or disengages the cord. It will be evident that the concaved contact portion of the thin metallic strip comprising the shoe 7 will yield if sufficient pressure be brought to bear thereagainst, but that nevertheless it will resist such pressure. Thus it will accommodate itself for cooperation with the dog 8 in order to securely grip or bind cords or chains differing materially in their sizes. It will be further evident that no adjustment of said shoe is required in order to effect that result; that the shoe and the dog are made each of a single piece of metal and that it is therefore practically impossible for either to become disordered or inoperative; that it can be operated by a novice; that the device is more economic of manufacture than those which have preceded it, and that it is more efficient in operation than prior devices of similar character.

Another feature to be particularly noted is that the convex portion of the dog 8 will force the cord 6 into the concave face of the shoe 7.- Owing to the corresponding curvatures of the coacting binding portions the friction will be greater than if the cor responding face of the shoe were straight or plane, and much greater than if it were opposite in curvature, and that the cord will be looked much more securely than if a shoe having either of the latter character of faces is used.

In Fig. 3 I have illustrated a modified shoe, 7, which is in outline a continuous loop having one serrated and one straight or plane face, this shoe being reversible.

lVithout limiting myself to particularities except in such places as they are definitely 'by' a cord, a skeleton loop-like lock-shoe within the frame, an a locking-dog for forcing the cord against the shoe.

3. In a pulley-block a frame, a sheave mounted therein, a skeleton, loop-like lockshoe secured within the frame, and an ogeeshaped locklng-dog having at its lower end an eye through whlch an actuating cord passes, one of its convex portions adapted to force said cord against said shoe.

4. In a pulley-block, a frame, a sheave mounted therein and adapted to be traversed by a cord, a locking-dog pivoted in the frame, and a skeleton lock-shoe one portion of which is adapted to be forced out of normal position when the locking dog is forced against the cord to force the latter against the shoe, the other portions of said shoe remaining in normal position.

5. In a pulley-block, a frame, a sheave mounted therein, a loop-like lock shoe arranged in the frame, and a locking-dog for forcing a cord against said shoe. I

6. In a pulley-block, a frame, a sheave mounted therein, a lock-shoe loosely but non-adjustably secured within the frame, alrlid means for forcing a cord against said s oe.

7. In a pulley-block, a frame, a lock-shoe held within the frame and made of thin and relatively wide metal, such as strap iron, and a locking-dog for forcing a cord against said shoe.

8. In a pulley-block, a frame, a lock-shoe held loosely within the frame and made of thin and relatively wide metal, such as strap iron, and a locking-dog for forcing a cord against said shoe.

9. In a pulley-block, a frame, a sheave rotatable therein, rivets arranged and held in the frame, a lock-shoe loosely and movably mounted on and surrounding said rivets, and a locking-dog adapted to force a cord against said shoe.

H. W. WILKINSON, R. H. RICKLEFS. w

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