Farriery – Shoes – Auxiliary tread plate
Patent
1984-01-18
1986-04-29
Swiatek, Robert P.
Farriery
Shoes
Auxiliary tread plate
168 13, A01L 500, A01L 702
Patent
active
045850682
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a horseshoe including an elastic lower part that reduces the load on the bones and muscles of the horse by its spring effect, in particular when the horse strikes a hard surface.
The U.S. Pat. Spec. No. 610 804 discloses a two-part horseshoe with an elastic lower part, where the sides of the ridge member of this part are formed with tongues or flanges to protrude into corresponding grooves in the side walls of the upper part. The tongues or the flanges and the grooves have a rectangular cross-section so that the lower part must be applied by inserting its ridge member longitudinally into the upper part. This requires a very loose fit between the two parts, which makes it necessary to retain the lower part by means of transverse rivets extended through holes in the side walls of the upper part and into the ridge member of the lower part. The use of such horseshoes involves the risk that the retaining rivets and then the lower part fall off.
The Swedish Pat. Spec. No. 8 597 discloses a horseshoe comprising two metallic parts, a fixed and an exchangeable one, with an intermediate packing. The lower part is detachably attached to the upper part by means of a locking pin which is slidably mounted on the front of the upper part and is spring loaded to engage a hole in the lower part. Fixed, cooperating engagement means are provided at the rear ends of the two parts.
The U.S. Pat. Spec. No. 660 788 discloses a two-part horseshoe with an elastic lower part, where the side walls of the channel-shaped upper part have spaced, inwardly directed hooks acting as barbs to retain the lower part after the lower part has been pressed past the hooks into the upper part. Such securing is insufficient to withstand the influences occurring in practice.
The object of the invention is to provide a horseshoe of the present type whose lower part is easy to exchange without using any tool other than e.g. a hoof cleaner, but which is nevertheless firm in position even under extremely severe conditions of use.
This object is achieved by providing cooperating projections and recesses on the upper part of the horseshoe, which is attached to the horse's hoof, and the exchangeable lower part, which consists of an elastic material, in which the projections are provided on the upper part and have an inclined, downwardly extending face and the recesses are formed in the ridge member of the lower part. An insert of a hard, strong material is embedded in the front or toe portion of the lower part and this insert and the upper part are formed with cooperating locking means which upon being engaged with each other can be fixed in locking engagement by causing the cooperating projections and recesses to engage each other by impression of the lower part into the upper part. The projections and the recesses, in addition to keeping the ridge member of the lower part in position on the upper part at the points, viz. the rearwardly directed forks of the shoe, where the detaching forces are relatively small, also serve the important function of keeping the locking means lockingly engaged at the front of shoe where the greatest forces are applied.
To further enhance the reliability of securing, the parts of the horseshoe together, the insert has a portion which, in the assembled horseshoe, protrudes upwardly in front of the rear side wall of the upper part. The rear side wall of the upper part prevents the upwardly extending portion of the insert from moving more than just slightly rearwards under the action of forces which urge the elastic lower part rearwards with respect to the upper part, and which, in some forms of locking means, might tend to cancel the locking engagement.
Preferably, the locking means are formed by a first locking hook extending rearwardly from the front portion of the front side wall of the upper part, and a second locking hook so disposed on the insert that upon displacement of the lower part with respect to the upper part, the two locking hooks can be caused to overlap each other with the locking hook
REFERENCES:
patent: 602387 (1898-04-01), Krumscheid
patent: 610804 (1898-09-01), Evans
patent: 646029 (1900-03-01), Long
patent: 660788 (1900-10-01), Conway
patent: 661593 (1900-11-01), Waste
patent: 749299 (1904-01-01), Jones
patent: 770917 (1904-09-01), Myers
patent: 4122900 (1978-10-01), Barr et al.
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