Патент USA US2403503код для вставки
July 9, 1946- K. L. COULTER 2,403,503 DETECTING SYSTEM AND APPARATUS‘ Fiiled Aug. 19, 1942 YB 15 KENNETH L. COULTER 1 g” M%%l% A 2,403,503 Patented July 9, 1946 UNITED STATES PATENT OFFICE 2,403,503 DETECTING SYSTEM AND APPARATUS Kenneth L. Coulter, Youngstown, Ohio, assignor to rEhe Astatic Corporation, Youngstown, Ohio, a corporation of Ohio Application August 19, 1942, Serial No. 455,312 1 Claim. (Cl. 1’77—314) 1 This invention relates to a detecting system and apparatus of the kind utilized in connection with alarm systems for warning of movements on or about protective barriers or enclosures such as, for example, wire fences and similar enclosures extending about an industrial factory. The pres ent invention is concerned primarily with the arrangement or method of mechanically coupling consideration of the following detailed speci?ca tion and the accompanying drawing wherein there is speci?cally disclosed a preferred embodi ment of the invention. In the drawing: Figure 1 is a perspective View of a section of a fence of the type usually employed about indus trial establishments, a view showing a preferred mode of applying the present invention to such the sensitive pick-up device or devices to the 10 fence; barrier or enclosure. When the detecting devices are applied directly Figure 2 is a sectional view along the line on the wire strands or fabric of the fence or en II—II of Figure 1; and proved arrangement for mechanically coupling ing application and is operative to detect minute Figure 3 is a sectional View along the line closure it is found that the vibration transmit III-III of Figure 1. ting qualities of the average industrial fence In the illustrated embodiment of the invention, varies between wide limits and in many instances 15 the fence may consist of a series of vertically ex is possessed of such high transmission loss that tending posts HI connected together at their up in order for the ‘pick-ups to be effective on dis per ends by the horizontal rail ll. Stretched tant signals a high ampli?cation factor must be over the frame provided by the posts Ill and rail utilized. Ampli?cation of this nature is difficult to control or to achieve with ?delity and, more 20 II is the wire mesh [4 and it will be understood that, in accordance with usual practice, the wire over, increases the sensitivity of the individual M is secured to the posts and rail at suitable in pick-ups beyond desirable limits to signals at tervals. A fence structure of this character may short distances and yet is inadequate to proper also include inclined top masts 12 to which are ly amplify more distant signals of equal magni tude, due to the aforesaid transmission loss. The 25 fastened strands l3 of barbed wire. Reference numeral l1 designates a sensitive present invention seeks to obviate this objection able aspect of the prior system and the primary mechanical vibration-electrical transducer of the object of the invention is the provision of an im kind disclosed in detail in the aforesaid co-pend the sensitive pick-up devices to the barrier or en 30 vibrations set up in any object to which it may be closure whereby a substantially uniform degree attached. It is found that if the transducer or of effective sensitivity will be maintained throughout the whole of the length‘ of the bar “pick-up” is attached to or suspended directly from the fence its range of sensitivity is rather rier or enclosure. _ limited, depending on the vibration transmitting The above object is accomplished, in accord. 35 characteristics of the fence structure and the ance with the preferred embodiment of the in practical objection to the increasing of the am vention by applying an e?icient vibration trans pli?cation factor beyond a, certain value, it being mitting band to the enclosure or barrier and at understood, of course, that the detections of the taching the pick-up devices directly to this band. unit H are suitably ampli?ed before being 40 In the preferred embodiment of the invention, reproduced audibly. this band may consist of a length of taut piano The present invention provides a practical ar wire rigidly connected to the barrier or enclosure rangement for distributing the effective sensitivity at spaced intervals. Thus substantially im proved results in the detecting of unauthorized of the pick-up I'I substantially uniformly along movements on or about the protective barrier or 45 the fence or enclosure. For this purpose the fence or enclosure is banded with a length 16 enclosure may be attained regardless of the struc of wire having good mechanical vibration trans mitting characteristics as, for example, piano Another object of the invention therefore is wire. Wire I6 is rigidly secured to the fence the provision of an improved arrangement for attaching the sensitive pick-up device or devices 50 structure at spaced intervals and preferably the attachment is made to the fabric M by the brack to the barriers or enclosures whereby the useful ets l5 at points disposed centrally in bays formed ness of the involved system is substantially tural character of the barrier or enclosure. by adjacent posts I0. It should be understood increased. however that the points of attachment may be The above and other objects and advantages of the invention will become apparent upon the 65 varied as to location and interval and may be 2,403,503 3 made on any of the other ‘parts of the fence structure. The pick-ups I‘! are suspended from the wire H5 at suitably spaced intervals, each unit being protected by a roof or cover 18 carried by the fence structure directly. In representative com mercial embodiments of the invention the pick 4 nomical ampli?er may be employed. The ampli ?cation gain may be materially lowered since the detection of Vibrations set up at points spaced materially from the respective Dick-ups is much more e?‘icient. The above speci?cally described embodiment of the invention should be considered as illus ups I‘! are spaced from 150 to 300 feet along trative only as obviously many changes may be the Wire Hi. In operation, minute and localized made therein without departing from the spirit vibrations set up in the fence or enclosure at 10 orv scope of the invention. Reference should any point are transmitted along a comparatively therefore be had to the appended claim in deter short path to one or the other of the brackets mining the scope of the invention. ' l5 and thus to the wire IS. The wire [6 is main What I claim is: tained under tension and. this together with its Apparatus of the character described compris physical character provides a highly efficient ing in combination a plurality of fence posts, a channel for the transmission of mechanical vi woven wire fence secured to said posts, laterally brations from any of the brackets I5 to one or extending brackets secured to said Woven Wire at more of the pick-ups H. In this manner the spaced intervals positioned intermediate said effective sensitivity of the pick-ups is more uni posts, a taut wire rigidly connected to the outer formly distributed throughout the length of the ends of said brackets, and a mechanical vibra fence or enclosure. tion-electrical transducer having its mechanical Other advantages of the use of the invention driving element mechanically connected to said are that a substantial reduction may be made in taut wire. the number of pick-up units and that a more eco KENNETH L. COULTER.