US3313526A - Safety tackle block - Google Patents

Description

April 11, 1967 R. A. OWENS 3,

SAFETY TACKLE BLOCK Filed June 20, 1963 2 Sheets-Sheet l /{/?f 2 Roy A a Via ra M & Z%

ATTORNEY April 11, 1967 R. A. OWENS SAFETY TACKLE BLOCK 2 Sheets-Sheet 2 Q Filed June 20, 1965 Way /4. Owe/w INVENTOR. M 6.2%

United States Patent 3,313,526 SAFETY TACKLE BLOCK Roy A. Owens, 1002 Bissonnet, Houston, Tex. Filed June 20, 1963, Ser. No. 289,365 3 Claims. (Cl. 254-491) This invention relates to new and useful improvements in a safety tackle block.

It is an object of this invention to provide a tackle block having a safety means therein to prevent inadvertent fall of-the load being carried by the tackle block.

It is another object of the invention to provide a tackle block having a safety device therein that will grip and lock the rope in the tackle block upon the rope traveling through the block at an excessive speed.

It is another object of the invention to provide a tackle block having a safety device therein that will lock the rope in the block upon a fall of the load and that may be readily and easily released and the block returned to use.

With the above and other objects in view, the invention has relation to certain novel features of construction, operation and arrangement of parts more particularly defined in the following specification and illustrated in the accompanying drawings, wherein:

FIGURE 1 is a side elevational view of the tackle block, with the outer housing partially broken away.

FIGURE 2 is a top cross sectional view taken on the line 2-2 of FIGURE 1.

FIGURE 3 is a cross sectional view in side elevation taken on the line 33 of FIGURE 2.

FIGURE 4 is a side elevational view of the tackle block, shown with the outer housing removed and illustrating the safety means in locking position, and

FIGURE 5 is an exploded view of the sheave locking means employed.

In the drawings, the numeral 1 designates a tackle block housing in which is mounted the axle 2. A hollow coaxial shaft 3 is mounted on the axle 2 and a rope receiving sheave 4 is mounted in the housing 1 and rotates on the shaft 3. The sheave 4 has the rope receiving peripheral groove 5 and the internal peripheral gear teeth 6. Mounted on the shaft 3 are the idler roller support 7 and the pawl 8. Means are provided, as the set screw 9, for anchoring the pawl 8 with the shaft 3 and axle 2. The idler support 7 is bracket shaped and has coaxial ports 10, 10 and the toothed idler roller 11 rotatably mounted between the side members forming the bracket. The pawl 8 is mounted between the side members of the bracket and has the passageway 18 by means of which the pawl is mounted on the axle 2. The pawl 8 is substantially wedge shaped, the side face of the pawl adjacent idler roller 11 being toothed to receive the teeth of the idler roller 11.

Mounted on the shaft 3 and bracketing the sheave 4 is the line guide 12 which is keyed to the shaft 3 by the keys 13, 13. The extended ends of the guide 12 is formed to cooperate with the groove 5 in the sheave 4 as a line guide for the rope mounted in the groove 5 of the sheave 4. The sheave 4 is hollow and has a face plate 16 mounted thereon for access to the interior thereof. Collars 17, 17 are formed on the inside ends of the line guide 12.

In operation, a rope 14 is mounted on the sheave 4 in the usual manner, being threaded through the line guide 12 and resting in the groove 5. As the sheave 4 rotates with the normal operation of the tackle block, the idler roller suspended from the shaft 3 in the idler roller support 7, meshes with the teeth in the sheave 4 and rotates freely with same. In the event of inadvertent fall of the load, or the like, causing the sheave to rotate at an excessive speed, the idler support will be swung in the direction of rotation of the sheave 4 until it contacts the pawl 8 and the teeth of the roller 11 lock with the teeth of the pawl 8, and the entire shaft 3 rotates, carrying with it the guide 12, moving the guide 12 from the position shown in FIGURE 1 to the position shown in FIGURE 4, and the rope 14 twisted and locked against the lower housing bolt 15, where the rope will be maintained against further movement until released. To release the lock, the rope 14 is backed off by reversing the pressure on the rope and reversing the direction of rotation of the sheave 4 until the guide 12 is returned to the position shown in FIGURE 1.

With the above considered a preferred form of the invention, by way of illustration only, the broad principle of the invention is defined by the appended claims.

What I claim is:

1. In a tackle block, a housing, an axle mounted in said housing, a coaxial shaft on said axle, a rope receiving sheave on said shaft, the internal periphery of said sheave being toothed, a pawl mounted on said shaft and secured to said axle and having one longitudinal side margin toothed, an idler support suspended from said shaft and having a freely rotatable gear in mesh with the teeth of said sheave, a line guide bracketing said sheave, the extended end thereof being formed to receive a rope, said guide being keyed to said shaft and said idler movable into contact with said pawl to lock said sheave and line guide in rotatable relation.

2. In a tackle block, a tackle block housing, an axle extending through said housing, a hollow shaft coaxially mounted on said axle, a sheave rotatably mounted on said shaft, the inner periphery of said sheave having gear teeth, a pawl mounted on said shaft and extending laterally therefrom, one longitudinal side wall of said pawl being toothed, a bracket embracing said pawl and suspended and freely rotatable on said pawl, a rotatable gear on said bracket in mesh with 'the teeth of said sheave, a line guide keyed to said shaft and having one end extended laterally therefrom, rope receiving means on the extended end of said line guide, said rotatable gear being adapted to rotate freely in suspended position during normal rotation of said sheave and being adapted to move with said sheave at excessive speeds into contact with the teeth of said pawl, locking said shaft with said sheave and rotating said line guide into rope locking position.

3. In a tackle block, a tackle block housing, an axle extending through said housing, a hollow shaft coaxially mounted on said axle, a sheave rotatably mounted on said shaft, the inner periphery of said sheave having gear teeth, a removable face plate on said sheave, a pawl mounted on said shaft and extending laterally therefrom, one longitudinal side wall of said pawl being toothed, a bracket embracing said pawl and suspended and freely rotatable on said pawl, a rotatable gear on said bracket in mesh with the teeth of said sheave, a line guide keyed to said shaft and having one end extended laterally therefrom, rope receiving means on the extended end of said line guide, said rotatable gear being adapted to rotate freely in suspended position during normal rotation of said sheave and being adapted to move with said sheave at excessive speeds into contact with the teeth of said pawl, locking said shaft with said sheave and rotating said line intorope locking position.

References Cited by the Examiner UNITED STATES PATENTS 590,759 9/1897 Hartshorn 254191 1,636,273 7/1927 Baker 254-191 2,313,437 3/1943 Hedenberg 18865.l

SAMUEL F. COLEMAN, Primary Examiner.

Claims (1)

1. IN A TACKLE BLOCK, A HOUSING, AN AXLE MOUNTED IN SAID HOUSING, A COAXIAL SHAFT ON SAID AXLE, A ROPE RECEIVING SHEAVE ON SAID SHAFT, THE INTERNAL PERIPHERY OF SAID SHEAVE BEING TOOTHED, A PAWL MOUNTED ON SAID SHAFT AND SECURED TO SAID AXLE AND HAVING ONE LONGITUDINAL SIDE MARGIN TOOTHED, AN IDLER SUPPORT SUSPENDED FROM SAID SHAFT AND HAVING A FREELY ROTATABLE GEAR IN MESH WITH THE TEETH OF SAID SHEAVE, A LINE GUIDE BRACKETING SAID SHEAVE, THE EXTENDED END THEREOF BEING FORMED TO RECEIVE A ROPE, SAID GUIDE BEING KEYED TO SAID SHAFT AND SAID IDLER MOVABLE INTO CONTACT WITH SAID PAWL TO LOCK SAID SHEAVE AND LINE GUIDE IN ROTATABLE RELATION.

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