US2235302A

US2235302A - Snatch block

Info

Publication number: US2235302A
Application number: US226118A
Authority: US
Inventors: Crawford K Stillwagon
Original assignee: Individual
Current assignee: Individual
Priority date: 1938-08-22
Filing date: 1938-08-22
Publication date: 1941-03-18
Anticipated expiration: 1958-03-18

Description

UNITED STATES PATENT, OFFICE 2,235,302,";Q; p c.

N TQH BLOCK Crawford jK. Stillwagon, Houston, Tex.

Application-August 22, 1938,.Serial No. 228,118

"ZCIaims. (01.255193).

This invention relates to a snatch block: f

An object of the invention is to provide equipment of the character described embodying. a

frame and a sheave adapted to receive a cable.

and rotatably mounted in the frame, said frame having one of its side plates hinged and latched with the corresponding end of the sheave spindle whereby upon release of the latch the hinged'side plate may be swung to open position to facilitate the mounting of the cable on, or its removal.

from, the sheave.

In the use of a block of this type it often becomes necessary, in various situations; vto: apply.

the block to and remove it. from a cable. Sometimes the cable is attachedat one end to a load and at its other end to a winding drum and in order to apply a conventional snatch block to the cable under such conditions it would be necessary to release the cable at one end and thread it through the snatch block and over the sheave thereof. With the type of snatch block herein described the hinged side plate can be released and swung open and the block readily applied to the cable in an obvious manner and with little effort and delay.

The type of block herein described is particularly useful in connection with trucks for loading purposes, on drilling rigs in handling tongs or other light loads about the rig although it is capable of general use.

With the above and other objects in view the invention has particular relation to certain novel features of construction, operation and arrangement of parts, an example of which is given in this specification and illustrated in the accompanying drawing, wherein Figure 1 shows a side elevational view of the block.

Figure 2 shows a longitudinal, sectional view showing the hinged side plate latched in closed position.

Figure 3 shows a similar view showing the hinged side plate in open position, and" Figure 4 shows an enlarged, longitudinal sectional View.

Referring now more particularly to the drawing wherein like numerals of reference designate the same parts in each of the figures, the numeral I designates one of the side plates of the frame. This side plate is approximately elliptical in form and is composed of one piece. The other side plate is of approximately the same contour as the plate I but is formed of two

sections

2, 3 which are hinged together on the transverse pin 4. Between the stationary section 2 and the plate I there is a swivel block'5 having the

end spindles

6, 6 which extend through aligned bearings of the respective plates and whose outer ends are threaded to receive the nuts I, I. The block 5 accordingly may swivel with respect to the frame. The block 5 has a bearing 8 therethrough to receive the shank 9 of the hook Ill. The inner end of the shank of the hook is threaded to receive a retaining nut I I thereon whereby the hook I0 may also swivel relative to the block 5.

It is to be noted that the outer threaded ends of the spindle 6 are reduced forming shoulders against which the nuts! abut when the nuts are screwed home so that the plates will be retained between the block 5 and the nuts I without binding so as to prevent the free turning movement of ;th e;block.

There is a sheavespindle I2, one endoi which is reduced and. fitted through a hole I3 and the plate I. The reduction of said end forms a shoulder which seats against the inside of plate I as shown in Figures 2 and 3. Said reduced end is threaded to receive the retaining nut I4 which clamps the plate I between said nut and the shoulder of said spindle. At its other end the spindle is reduced and fitted through the hole I5 of the plate section 3, the reduction forming an inside shoulder of the spindle which fits against the inside of the plate section 3. This last mentioned end of the spindle I2 has an external, annular rib I6 therearound and a. sleeve I1 is driven into the sheave and surrounds said spindle and one end of which abuts the inner side of the plate I and the other end of which abuts the inner side of the ribs I6 whereby to prevent the sheave I8, mounted on said spindle, from becoming tightly clamped between the side plates, to the end that the sheave will also be free to turn.

The rib I6 also prevents displacement of the sheave from the spindle when the hinged section 3 is swung open. Suitably secured to the outer side of the section 3 and in alignment with the bearing I5 there is a latch retainer l9. It may be welded or otherwise secured to the outer side of has an oblong slot 24 wherein is seated a strong coil spring 25 one end of which bears against the outer end of the slot 24 and whose other end rests against a washer 250 which, in turn, rests against a pin 2511 which is fitted through the retainer and into the section 3 as shown in Figure 4. The latch is thereby held yieldingly outwardly. The end of the latch opposite the notch 2| extends beyond the retainer I 9 and countersunk therein there is a transverse grip member 26 which extends each way beyond the latch and which is secured therein by the

set screws

21, 21. Normally the notched end of the latch will engage behind the enlarged end 23 of the sheave spindle and will be held in such engagement by the pres sure of the spring 25.

If it be now desired to remove a cable from, or

place the cable around, the sheave IS, the grip member 26 may be grasped and the latch released a and the section 3 swung outwardly as shown in Figure 3 for the purpose intended.

When the cable has been mounted on the sheave the hinged section 3 may be then swung intoclosed position and the notched end of the latch will engage the beveled outer end 23 of the sheave spindle and the latch will be automatically retracted and upon its registration with the reduced portion 22 the spring 25 will urge the latch into engaged position behind the enlarged portion 23 of said spindle thus retaining the cable in place.

What I claim is:

1. A snatch block comprising a frame composed of approximately parallel thin side plates. ;one of which is formed of a fixed section and a hinged section and the other being unitary, a

swiveling block bolted to and between said unitary plate and the fixed section of the other plate, a hook having a swiveling connection with said swiveling block, a sheave spindle having extended ends one end being supported by and connected to said unitary plate by a nut on said end, the other end of said spindle being supported by the hinged section of the other plate by the other extended end, a bearing sleeve on the spindle, a sheave fitting tightly on the bearing sleeve between theplates, means for retaining the sleeve on the spindle, means for maintaining the hinged section in said supporting relation with the corresponding extended end of the spindle.

2. A snatch block comprising a frame composed of approximately parallel side plates one of which is formed of a fixed section and a hinged section and the other of which is unitary, a swivel block mounted to rotate on a transverse axis between the unitary plate and the fixed section of the other plate, a hook having a swiveling connection with said block, a sheave spindle having one end reduced forming an annular shoulder, the reduced end being fitted through a bearing in the unitaryplate and said shoulder bearing against said plate, a clamp nut threaded on to said reduced end and clamping said plate between it and said shoulder, an annular rib on the spindle, a bearing sleeve around the spindle one end of which abuts said unitary plate and the other end of which abuts said rib whereby the sleeve is retaine'd 'on the spindle, a sheave mounted on said bearing sleeve and extending over said rib, the other end of the spindle, beyond said rib, being reduced, said hinged section being formed with a hole to receive said last mentioned end when said hinged section of the plate is brought into parallel relation with said unitary plate, and means for detachablyvsecuring said hinged section in said last named position.

CRAWFORD K. STILLWAGON.