US1364041A - Sighting apparatus for use with ordnance - Google Patents

Description

' lisai'iSi'im- 33-244. cm 1,36A.041 5R A. T. DAWSON AND J. HORNE.

SIGHTING APPARATUS FOR USE WITH ORDNANCE.

APPLICATION man AUG 12, I920.

1,364,041 Patented Dec. 28, 1920.

UNITED STATES PATENT ()FFICE.

ARTHUR TREVOR DAWSON, OF WESTMINSTER, AND JAMES HORNE, OF BARROVV-IN FURNESS, ENGLAND, ASSIGNORS TO VICKERS LIMITED, OF WESTMINSTER, LON- DON, ENGLAND.

SIGHTING APPARATUS FOR USE WITH ORDNANCE.

Specification of Letters Patent.

Patented Dec. 28, 1920.

Original application filed November 10, 1919, Serial No. 337,043. Divided and this application filed August 12, 1920.

To all to ham it may concern:

Be it known that we, Sir ARTHUR TREVOR DAWSON, Bart, and Julius HORNE, both subjects of the King of Great Britain, residing, respectively, at Vickers House, Broadway, Westminster, in the county of London, England, and Naval Construction WVorks, Barrow-in-Furness, in the county of Lancaster, England, have invented certain new and useful Improvements in or Relating to Sighting Apparatus for Use with Ordnance, of which the following is a specification.

This invention relates to sighting apparatus, for use with ordnance, of the kind comprising a telescope, sight bar or other sighting element which is mounted independently of the gun or guns and is capable of rotation in azimuth, this sighting element being employed for transmitting training angles or elevation angles or both to the gun or guns.

According to the present invention we provide a hood or canopy which protects the sighting element and is rotatably mounted independently of the latter and we provide means of a non-rigid character for angularly displacing said hood or canopy in unison with the angular movement of the said element in azimuth, these means being so constructed and arranged as to avoid the production of any side drag upon the sighting element and also to avoid undesirable strains on the sighting element in the event of the axes of movements of the sighting element and the hood or canopy being out of alinement or eccentric.

In order that the said element may be clearly understood and readily carried into effect, we will describe the same more fully with reference to the accompanying drawings, in which Figure 1 is a sectional side elevation showing more or less diagrammatically a constructional form of the invention, and

Fig. 2 is a plan of the left hand portion of Fig. l.

A is a platform or rotating table carrying the sighting element K. B is the hood or canopy for protecting the sighting element K and C is part of the fixed structure having a roller track C on which rollers B carried by the canopy run.

The constructional form of the means Serial No. 403,111.

shown for imparting rotary movement to the canopy comprises a rack C attached to the fixed structure C and a pinion A engaging with this rack. The said pinion is mounted on a radially disposed shaft a connected by suitable gearing with the hand wheel A or similar device carried by the platform A for rotating the latter through uitable gearing which is not shown. The outer end of the said shaft is supported by a bearing formed in a bracket B depending from the canopy B so that rotation of the shaft and pinion causes the canopy to rotate in unison with the sighting element. The said shaft is provided with a flexible coupling arrangement such as a Hookes joint and also, if desired, with a telescopic or sliding coupling device; the latter may however be dispensed with by providing a certain amount of axial freedom of movement between the shaft a and the bracket B and thus allowing the pinion A to slide endwise on the teeth of the rack C in the event of the platform A and the roller path C becoming eccentric. Thus lack of concentricity between the sighting element and the protecting canopy will not give rise to strains on the gear. It will be observed that the arrangement shown does not produce any side drag on the platform A since the bearing for the shaft a is carried by the canopy. It will thus be clear that two such shafts and pinions arranged opposite to one another would have no further beneficial effect in so far as side drag on the platform A is concerned; in cases where it may be desired to balance the pull at both sides of the rotating canopy two such shafts could however be employed.

What we claim and desire to secure by Letters Patent of the United States is 2- 1. In sighting apparatus for use with ordnance, of the kind comprising a sighting element which is mounted independently of the gun or guns and is capable of rotation in azimuth, this sighting element being employed for transmitting training angles or elevation angles or both to the gun or guns, the combination with the sighting element, of a rotatable table supporting the sighting element, a hood or canopy for protecting said sighting element and rotatably mounted on a fixed part of the structure independently of said sighting element and said r0- tatable table, a device for imparting rotary motion to said table, and gearing interposed between said device and the hood or canopy, this gearing comprising two elements one carried by the hood or canopy and the other connected to the fixed structure upon which the hood or canopy rotates.

2. In sighting apparatus for use with ordnance, of the kind comprising a sighting element which is mounted independently of the gun or guns and is capable of rotation in azimuth, this sighting element being employed for transmitting training angles or elevation angles or both to the gun or guns, the combination with the sighting element, of a rotatable table supporting the sighting element, a hood WXN'OI protecting imamsaid sighting element and rotatably mounted on a fixed part of the structure independently of said sighting element and said rotatable table, a device for imparting rotary motion to said table, and gearing interposed between said device and the hood or canopy, this gearing comprising two elements one carried by the hood or canopy and the other connected to the fixed structure upon which the hood or canopy rotates, and also comprising a shaft having a flexible coupling between said device and the first mentioned gearing element.

' In testimony whereof we affiX our signatnres.

ARTHUR TREVOR DAXVSON. JAMES HORNE.

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