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Publication numberUS1288550 A
Publication typeGrant
Publication dateDec 24, 1918
Filing dateAug 31, 1917
Priority dateAug 31, 1917
Publication numberUS 1288550 A, US 1288550A, US-A-1288550, US1288550 A, US1288550A
InventorsRobert J Forsyth
Original AssigneeRobert J Forsyth
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Guard for pump-chains.
US 1288550 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)




1,288,55, 1 Patented Dec. 24, 1918.




Application filed August 31, 1917.

To all whom it may concern:

Be it known that I, ROBERT J. FonsYTH, a citizen of the United States, residing at Jefferson, in the county of Ashtabula and State of Ohio, have invented certain new and useful Improvements in Guards for Pump-Chains, of which the following is a specification.

This invention relates to improvements in guards for pump chains and more particularly to a chain holding device adapted to prevent the chain used in the pump from becoming detached from the driving sprocket over which the chain travels.

One of the objects of the invention is to provide a resiliently mounted guard overlying the chain and yieldably held in proximity to the chain as it passes over the wheel or sprocket so that free movement of the chain will be permitted and displacement thereof from the sprocket will be prevented.

The invention also aims to provide a guard of this character that will not interfere with the free action of the chain and will be so arranged that buckets may be employed in connection with the chain; the invention being adapted for use with any type of chain now commonly employed on chain pumps.

A further object of this invention is the provision of a guard for pump chains which consists of comparatively few parts and is simple in construction, but durable and well adapted to withstand the rough usage to which devices of this character are ordinarily subjected.

For a full description of the invention and the advantages and merits thereof, reference is to be had to the following description and the accompanying drawings, wherein is illustrated the preferred form of my invention, in which:

Figure l is a side elevation of a chain P p;

Fig. 2 is an enlarged fragmentary vertical section;

Fig. 3 is an enlarged fragmentary vertical section taken on the line 3-3 of Fig. l, and

Fig. 4 is an enlarged detailed section taken on the line H of Fig. 2.

Referring to the drawing wherein is illustrated the preferred form of my invention, and in which like numerals of reference indicate corresponding parts throughout the Specification of Letters Patent.

Patented Dec. 24, 1918.

Serial No. 189,153.

several views, the pump casing or boxing 1 has arranged near its top a shaft 2 upon which a wheel 3 is mounted. The wheel rim carries a plurality of forked elements 4: and the terminals of the forked portions are equally circumferentially spaced apart so that they may mesh with the links of the chain 5 which is actuated for operating the pump. For rotating the shaft, in order that the pump may be operated, I have provided a crank 6 on one end of the shaft 2 at the exterior of the pump casing 1. This crank is connected to a. connecting rod 7 attached to a foot pedal 8 which will be actuated to place the pump in motion.

Referring particularly to Fig. 4 of the drawing it will be noted that the forked elements 4 are arranged centrally on the rim of the wheel 3 and the links of the chain, when received on the forked elements have portions disposed on opposite sides of the latter. To prevent the links thus engaged with the forked elements from becoming accidentally displaced I have provided the two semi-circular guard plates 9 which are laterally spaced apart to form a central passage way 10. It will be noted that the guards are also slightly spaced from the circular path of the chain so that a slight space intervenes between the guards and the links of the chain. This space, however, is not suflicient to permit the chain to jump or become disengaged from the forked elemcnts. The space 10 permits the passage of buckets if a chain having buckets is used.

For holding the guard in position I have provided the supporting rods 11 which are in the form of strands of wire of relatively heavy gage. Each of these wires is provided with a coil 12 to form a spring so that the guards to which the wires are attached are resiliently supported and they are thus prevented from being broken or damaged when the chain strikes against the guards. When the pump is being operated at a high speed the chain will be held to this place and the common occurrence of the chain jumping ofi the driving wheel is prevented.

From the foregoing it will be observed that a very simple and durable guard for pump chains has been provided, the details of which embody the preferredform. I desire it to be understood however, that slight changes in minor details of construction may be made Without'departing from the spirit of the invention or the scope of the claims hereunto appended:

1. In a device of the character described, the combination of a pump chain and a driving Wheel therefor, a pair of guard members laterally spaced apart to provide a space around and above the said Wheel at the upper half thereof, and a'plurality of springrods attached to and supporting the said guard members to'yieldably retain them in position.

2. In a device of the character described, the combination of a pump chain and a driving Wheel therefor, the latter having a plurality of'forked elements meshing with the chain, a a pair of semi-circular. guard members disposed above the said driving Wheel at opposite sides of the said forked elements, the arcuate inner faces of the said guard members being radially spaced from the links of the chain, and supporting members for each guard member, the said supporting members having coils to provide a resiliency for yieldably supporting the said guard members.

In testimony whereof I afiix my signature inpresence of two Witnesses.


Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. 0.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4197766 *Aug 14, 1978Apr 15, 1980James Robert GCounter-balanced pumping system
US4404907 *May 5, 1981Sep 20, 1983M.A.N.-Roland Druckmaschinen AktiengesellschaftWeb threading apparatus for rotary printing machines
US4492304 *Dec 14, 1981Jan 8, 1985Fmc CorporationConveyor chain retainer shoe
US7946939 *Apr 6, 2007May 24, 2011Nissan Motor Co., Ltd.Slippage prevention mechanism for toothed endless torque transmission member
DE10118868A1 *Apr 18, 2001Oct 31, 2002Koenig & Bauer AgTransportvorrichtung
WO2002083419A1Mar 15, 2002Oct 24, 2002Keller Martin RichardTransport device for inserting a web into a web processing machine
U.S. Classification474/140, 474/146, 198/837
Cooperative ClassificationF16H7/18