US2197698A - Snatch block - Google Patents

Description

April 16, 1940. G. F. LAMBERTH SNATCH BLOCK Filed Dc. 25, 1957 Patented pr. 16, 1940 PATENT oFFIcE SNATCH BLOCK George F. Lamberth, Houston, Tex., assignor of one-third to Russel A. Bonham and one-third to Warren E. Fahner, Houston, Tex.

Application December 23, 1937, Serial No. 181,403

1 Claim.

The present invention relates to new and useful improvements in snatch blocks and has for one of its important objects to provide, in a manner as hereinafter set forth, a device of this character embodying novel means for mounting the pulley wheel in position.

Another very important object of the invention is to provide a snatch block of the aforementioned character comprising a pulley wheel o-f novel construction.

Other objects of the invention are to provide a snach block of the character described which will beA comparatively simple in construction, strong, durable, highly eiiicient and reliable in use, compact, light in weight and which may be manufactured at low cost.

All of the foregoing and still further objects andA advantages of the invention will become apparent from a study of the following specification, taken in connection with the accompanying drawing wherein like characters oi reference designate corresponding parts throughout the several views, and wherein:

Figure 1 is a View in side elevation of a snatch block construction in accordance with the present invention.

Figure 2 is a view partially in front elevation and partially in vertical section.

Figure 3 is a detail view in side elevation of the pulley wheel.

Figure 4 is a sectional view, taken substantially on the line 4;- 4 of Fig, 3.l

Figure'` is a detail view in side elevation of the inner portion or member of the pulley wheel. f

Referring now to the drawing in detail, it will be seen that the embodiment of the invention Which has been illustrated comprises a pair of metallic side plates I of the configuration shown in Fig. 1 of the drawing. Mounted for rotation between the side plates I is a pulley wheel which is designated generally by the reference numeral 2. As illustrated to advantage in Figs. 3 to 5, in- I clusive, of the drawing, the pulley wheel 2 comprises an inner member 3 from the opposite sides of which trunnions 4 project. The trunnions 4 are journalled in suitable bearings 5 which are mounted in aligned openings provided therefor in the side plates` I. As shown in Fig. 2 of the drawing, the side plates I are substantially conveX. A transverse .opening 6 extends centrally through the inner pulley `member 3. Projecting from the periphery'of the member 3 are pairs of spaced, substantially segmental ears or the like 'I having openings 8 therein. Removably mounted lon the member 3 is a peripherally grooved rim 9. On the inner periphery o1" the rim 9 are spaced, substantially segmental tongues or the like I which are engageable between the pairs of lugs 'I and which have openings therein for alignment with the openings 8 for the reception of removable securing pins I I, f

Rigidly secured in any suitable manner, as by welding, on the outer sides of the plates l are metallic straps I2. The upper end portions of the strap I2 are inwardly offset and abut each other, as at I3, and are welded together.r Aligned openings I 4 are provided in the upper end portions I3 of the straps I2. Bolts I5 secure the upper end portions of the side plates I together. The bolts I pass through a spacing block I6 between the upper portions of the plates I. It will be observed that one of the bolts I5 also passes through the straps I2. A center bolt I1 extends through the plates I and the straps I2, said center bolt passing through the opening 6 in the member 3.

At their lower ends, the straps I2 are reduced and terminate in split eyes or the like I8. Mounted in the eyes I8 and depending therefrom are loops I9. Mounted in the loops I9 is a crosshead 2'I from which is suspended a swivelled hook 20. The split eyes or the like IS terminate in inwardly extending lips 2l which are engaged in slots 22 which are provided therefor in the lower portions of the side plates I.

The inner sides of the plates I are recessed, as at 23, for the reception of the side portions of the pulley wheel 2. The construction is such as to prevent the cable from jumping the pulley wheel and lodging between said pulley wheel and the side plates. Inwardly of the recesses 23, the plates I are further recessed, as at 24, to provide ample clearance for the wheel 2. Inwardly of the recesses 24, the inner faces of the side plates I are provided with circular grooves 25 for the reception of felt rings or Washers (not shown) for retaining a lubricant and for preventing the passage of dirt, grit, etc., to the bearings. Washers 26 of felt or other suitable material are provided in the bearings 5 between the outer ends of the trunnions 4 and the straps I2 for p-reventing the passage of dirt at these points.

It will thus be seen that a snatch block has been provided wherein all of the load is carried by the side plates I rather than by the center bolt Il, as at present. Further, by reason of this mounting, wobbling of the pulley wheel 2 is ma- I ings or bearings 5 may be expeditiously removed and replaced when necessary or desired. Still further, should Wear occur on the inner member 3 of the pulley Wheel, said member may be replaced and the use of the rim 9 continued.

It is believed that the many advantages of a snatch block constructed in accordance with the present invention will be readily understood and although a preferred embodiment of the device is as illustrated and described, it is to be understood that changes in the details of construction and in the combination and arrangement of parts lmay be resorted to which Will fall with the scope of the invention as claimed.

What is claimed is:

A snatch block comprising a pair rof side plates having elongated apertures at one end thereof, a pulley Wheel rotatably mounted between said side plates, metallic suspension straps fixed on the outer sides of the side plates, said straps having reduced ends forming lips at the said end of said side plates, a crosshead, a hookfsWivelly-mounted in said crosshead, loops suspending vsaid crosshead, said reduced ends of saidl straps turned to form split eyes for suspending theloops, said lips projecting through the apertures of the side plates and engaging their inner sides for anchoring said straps. t

GEORGE FpLAMBERTI-I.

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