US 3854722 A
A target has pairs of penetrable electrical conductive sheet-like elements that are flatwise opposed and spaced apart a distance to be transiently electrically connected by a penetrating projectile. Each pair corresponds to an annular scoring zone. Elements for radially outer scoring zones are on a permanent front sheet-like structure; those for inner ones are on a readily replaceable sheet-like structure installed behind the front one. To accommodate possible misalignment of the sheet-like structures the radially innermost elements on the front structure partially radially overlap the radially outermost ones on the rear one. Such overlapping elements cooperate for one scoring zone, and corresponding ones of them on the two structures are electrically interconnected.
Description (OCR text may contain errors)
United States Patent 1191 r 1111 3,854,722
ohlund et al. 1451 Dec. 17, 1974 4] ELECTRICAL INDICATING TARGET WITH 3,396,971 8/1968 Estep 273/1024 REMOVABLE CENTER SECTION 3,454,277 7/1969 Mura 273/1022 A 3,499,651 3/1970 Hubbard 273/1022 R  Inventors: Johan Alex lngvar Ohlund,
Huskvama; Mannerblad; Primary Examiner-Anton O. Oechsle Alexlus waugard both of Assistant Examiner-Marvin Siskind Jonkopmg, all of Sweden  Assignee: Saab-Scania Aktiebolag, Linkoping, 57 T CT Sweden A target has pairs of penetrable electrical conductive 1 Filedl 1972 sheet-like elements that are flatwise opposed and  APPL NO: 316 033 spaced apart a distance to be transiently electrically connected by a penetrating projectile. Each pair corresponds to an annular scoring zone. Elements for ra-  Foreign Application Priority Data dially outer scoring zones are on a permanent front Dec.23, 1971 Sweden 16554/71 Sheet-like Structure; those for inner Ones are a readily replaceable sheet-like structure installed be- 52 US. Cl 273/1022 A hind the from To accommodate possible 51 Int. Cl F4lj 5 04 gnment of the sheet-like structures the radially 58 Field f Search 273/1022 R, 1022 A, nermost elements on the front structure partially radi- 102 1(1273/1024;307/233;35/25 ally overlap the radially outermost ones on the rear one. Such overlapping elements cooperate for one  R f r Cit d scoring zone, and corresponding ones of them on the UNITED STATES PATENTS two structures are electrically interconnected.
2,695,173 11/1954 Sterne 273/1022 R 5 Claims, 4 Drawing Figures PAnNw 3.854.722
. SHEET 1055 I F'IGJ.
PAIENT mam 1 mm sum 3 0F 2% v ELECTRICAL INDICATING TARGET WITH REMOVABLE CENTER SECTION This invention relates to a shooting target intended for fire arms that discharge projectiles of electrically conductive material, and which target is of the-kind that comprises at least two electrically conductive sheets that are carried within a frame, one behind the other, spaced apart by a distance less than the length of the projectile, with a sheet of dielectric material between them. Each of the conductive sheets is connected through conductors to an electrically operated scoring device. One of the sheets is divided into area elements that are electrically insulated and laterally equally spaced from one another so that they define a number of sensitive zones which together define the target area, and each area element has its own output conductor and represents one of a plurality of predetermined hit values so that the projectile, during its passage through the target, establishes an electric contact between one of the area elements of said one sheet and the other sheet. The hit will be recorded by the scoring device as a value which is dependent upon the particular one of the area elements that has been hit.
Targets of this kind are known through the Swiss patent specification No. 479,852 and the US. Pat. 3,539,828, among others, and systems for rifle ranges based on this automatic indicating method have also been an object of industrial production during recent years. However, it has not been possible to fully utilize the advantages attained by these targets in practice due to the tear to which the conducting sheets are subjected in being repetedly penetrated by projectiles. Also in using new materials that afford improved durability to tear it has been found that there is an upper limit to the number of projectiles that can be fired against the target with faultless indications, but above that limit there is a risk of an erroneous indication or none, due to projectile damages to the conductive sheets.
To discard a whole target due to such a defect which is of local nature and can appear at an unforeseen point within that portion of the target where the shots most frequently hit is expensive; but to repair the defect by mending the conductive sheets at the damaged spot has'proved to be difficult because the sheets and their insulating bases are joined with one another. Furthermore, a repair of the target is not any lasting solution of the problem since a new defect in the same target can be expected to appear at another place. A previous suggestion to make such a target with a joint which follows the border line between two sheet elements and divides the conductive sheets into two groups, of which the inner one would be exchangeable, has likewise not proved to be any rational and reliable solution of the repairing problem.
Another disadvantage with the prior electrically selfindicating targets is that there is no possibility of supplying a target with another type of rings, zones or sectors than those previously used, in order to adapt the division of the target area to the shooting program that is available and thereby reduce the store of targets for a rifle range plant.
The general object of the invention is to provide a target of the above described kind which need not be rejected by reason of a local damage on a central portion of the target where it is subjected to the most intensive fire but which can easily and conveniently be repaired for a new use.
More particularly the object of the invention is to construct a precision target of two separate units, one of which is exchangeably mounted on the other and each of which comprises sensitive zones, which units complement each other in their assembled position in such a way that a predetermined clearing distance between the zones, related to the kind of projectile used, will be uniform between all the zones irrespective of tolerances of and between the units, thereby preserving the precision of the target.
The invention will be more fully explained in connection with accompanying drawings where FIG. 1 is a perspective view of a rifle range having shooting targets embodying the invention.
FIG. 2 is a cross section view of a shooting target according to the invention, the drawing scale being highly diminshed in the direction of the target plane.
FIG. 3 is an exploded perspective view illustrating the construction and the electric connections in the embodiment shown in FIG. 2.
FIG. 4 is a diagram illustrating a part of the electric connection.
In FIG. 1 there is shown a rifle range having a number of self-indicating target boards 11 for training and competition shooting with small-bore guns. Each of the target boards can be supported in a conventional way by having its legs placed in receptacles attached to the rear side of a protection wall 13. A target area having an aiming dot, a figure or some other visible marking to aim at is positioned within a target frame 14 to be exposed to the gunners at the shooting station, while the crest of the wall protects the lower edge of the board and an electric fitting mounted thereon and here shown in simplified form as a connector 15 with a signal cable 16 extending therefrom. For determining the positions of the hits scored, the target area is divided, in conformity with the shooting regulations available for the shooting that shall take place, into fields which are marked by different values and which can be limited by concentric separating lines 17; and, further, the target area can also be divided as indicated in the example shown by radial sector lines 18, so that for a hit point not only its value but also its direction in relation to the geometric centre 19 of the board can be indicated. Such a division is made in known manner by attaching Such the frame at least two parallel electrically conductive sheets that are penetrable by the projectiles, from which sheets strips have been cut away representing the concentric separating lines and radial sector lines, and from which sheets conductors extend, one for each insulated area element of the target area, all leading to the connector 15. When a projectile penetrates the sheets, with the sheets at different electrical potentials, it establishes during a short time a short-circuit. Through a pair of conductors a signal is received in the cable 16 that extends to the shooting station and after the signal is decoded at that station an indication visible to the gunner is obtained on an indicator 20 belonging to each target.
The structure of a target device of the above described kind, made according to a preferred embodiment, appears more fully from FIGS. 2 and 3, which show a precision target. The shooting direction is here indicated by an arrow 21 and the parts are described in the order they occur in the target along this direction.
In front of the frame 14 there is a covering sheet 22 which is attached by means of rivets that can be covered by strips 23. Nearest inside the covering sheet, having an aiming dot or bullseye 24, there is a wiping sheet 25 that is glued to the frame and made from plastics or the like. The wiping sheet serves to wipe-off the oil or grease film which may cover the cylindrical surface of the projectile. A front unit follows thereafter which comprises the parts indicated by a bracket 1, viz. a sector sheet 26 consisting in known manner of an electrically conductive sheet, e.g., made from electrically conductive rubber, and divided into sectors A H that are insulated from one another; further, an intermediate plate 27 of the same shape as the sector sheet, which plate supports the latter and is made from PVC foam or some other insulating material that is resistant to changes of form, light-weight and penetrable by projectiles; further, a ring sheet 28 of the same material as the sector sheet and having a size so adapted to the shooting regulations that a target area prescribed therein can be encompassed within the edges of the ring sheet. The ring sheet has its central portion cut away, as is the case with the sector sheet 26, so that an inner edge is formed for a zone 6'. The ring sheet can be divided into concentric ring shaped area elements which are designated by scoring values, in the example 1 6. The rings are insulated from one another in that strips have been cut out from the conductive sheet. Behind the ring sheet there is in unit I a base plate 30 on the rear side of which vertically and horizontally extending guides 31 and 32, respectively, are fixed. The base plate and guides consist of insulating material and support downwardly extending conductive strips 33 33, one for each area element of the ring sheet 28, which strips are folded from the rear side of the guides 31, round the edges of these, and are passed through slots in the base plate 30 and in the ring sheet 28 on the front side of which the strips terminate in flaps 34. For reasons of space the strips 33, 33 and 33 are applied on one of the guides whereas the strips for the rings 2", 4 and for the zone 6 are applied on the other guide. Insulating sheets 35, 36 respectively cover the strips on the rear sides and the inner edges of guides 31.
' The abovementioned pieces of material are joined with one another by gluing so that the circular inner edges 29 of the sector and the ring sheets 26 and 28 respectively coincide as seen in the shooting direction. A centering device (not shown) placed in the geometric center of the unit is used, after which the unit is attached, preferably by gluing, to the inside of the frame 14 where the outer frame members 37 and cross-bars 38 extending in the plane of the target and joined with the frame at its upper portion and along the sides, to-
gether form a rabbet which facilitates the assembly. In 7 joining the ring sheet 28 with the plate 30 a conductive cement is applied to the flaps 34 so that each ring is electrically connected through the conductive-strips with connection members 39 in the form of riveted cable clips positioned at the lower end outside the ring sheet. Also the portion of the target area positioned outside ring l can be provided with an output line. Corresponding output leads 40 are further connected with the sector sheet 26 which in known manner has side strips 41 that are drawn outside the target area defined by the ring sheet and extend from the upper sectors to the lower edge of the unit. Since the insulating distance between the conductive sheets 26 and 28 is less than the length of the projectile used, a hit at every arbitrary point of the area where the ring sheet and sector sheet cover each other establishes a contact of short duration between two of said connection members and thus produces an output due to difference of potential between ring sheet and sector sheet, which output is transmitted, through a sleeve box 42 mounted on the bottom member of the frame and a multi-core cable 43 extending to the connector 15, to a register comprising logic circuits and arranged in such a way that a signal is produced for each such contact with the target, which signal unambiguously indicates the value of the shot as well as the sector position.
Behind the unit I there is a unit II comprising a sheet 44 having conductive sectors a h, each provided with a sector strip 45 of the same material, and a centrum part 46 which here comprises an inner zone 6" of the ring 6" of the target, together with the central portion of the target, which is positioned inside the ring and divided in the usual way into area elements 7 10. As with the unit I, the conductive sheets are insulated from one another and from parts rearwards of them by means of a pair of plates of plastics 47 and 48. The plastic plate 48 is provided on its back with ring strips 49 49 that have their upper ends passed through said plastic plate and through the ring sheet 46 opposite to their respective area elements and said strips, during assembly of the unit ll, have been electrically connected on the front side of the ring sheet with the area elements at the joint places designated by 50. As usual there is within ring 10 a high value 10 or the inner-ten comprising the very center portion of the aiming dot, and here no indication of sector is required but a cut out has instead been made in the sector sheet 44 which cut out has a circular edge 51, whose diameter is so chosen that scores which shall be related to the inner ten" freely pass inside the edge. To establish a short-circuit" also for such a center shot there is a supplementing contact plate 52 positioned behind the center of the insulating plate 48 and insulated on opposite sides, which contact plate cooperates with a logic circuit indicating the failing contact with the sector sheet 44. A contact strip 53 passes from the contact plate at the side of the ring band 49 to the lower edge of the insulating base. Connected to each of the area elements of the unit Il there is a ring conductor 54 and a sector conductor 55 which have been assembled in a multi-core cable extending to a pin terminal 56 that can be releasably connected with the sleeve box 42. The unit is protected on its rear side by an insulating sheet 57.
The electric connection of the target is such that the sector conductors 55 will be connected in parallel with corresponding conductors 40 of the front unit I, e.g.,
the sector a connected with the sector A, b with B and so on, and in addition the conductor of the ring strip 49 which leads out from the inner zone 6" is connected in the sleeve box 42 to the strip 33 and thus to the outer zone 6 of the ring 6 belonging to the front unit, as appears from FIG. 4, which illustrates schematically the wiring diagram for the sleeve box 42.
As appears from above description and from FIG. 2 the diameter of the opening in the ring sheet 28. deter mined by the edge 29, is smaller than the diameter of the outer edge 58 of the centrum part 46 but larger than the prescribed inner diameter of ring 6; and
since the other rings of the target either are located in the unit I or in the unit II there will thus be a duplication of the ring-indicating conductive material for ring 6, which is a characterizing feature of the invention. Within the target area of ring 6 i.e., the circular ring area confined inwardly by the edge 29 and outwardly by the edge 58, the projectiles pass through the front as well as through the rear ring sheets while a projectile that passes immediately radially inwardly of the edge 29 only passes through the zone 6" of the rear unit and a projectile that passes outside the circle ring 46 but still scores a 6 hits the zone 6' of the front unit. By reason of this arrangement, the limits of the 6 zone, or of such other area element where it may be desirable to place the merge between the units of the target will not be affected by the division of the target, but hits penetrating such area can be scored with the same technics and with the same precision as those striking within the limits of the other rings of the target despite the fact that there is within the ring in question a physical border between the units enabling an exchange of the central part of the target.
In order to obtain a mounting position of the rear unit II that is geometrically correct and independent of projectile damages, that unit is adapted to fit into the space that is formed along the base 30 between the guides 31 and 32, preferably in such a way that the side edges 59 of the cemented plates 47 and 48 are fittingly guided by the guides 31 (see FIG. 2) while the upper edges 60 of the plates are adapted to engage the guide 32. This position is also determined by a holding means which, like other elements within the frame 14, shall be penetrable by projectiles without being shattered and which preferably is arranged to mutually fix the rear surface of the base 30 in relation to the opposing front surface of the sector sheet 44 and the plate 47. In the preferred embodiment the fixing is made by means of velcro strips or similar self-fastening but detachable strip material which can be applied on the two surfaces as a pair of strip parts positioned opposite each other. The drawing illustrates such fastening means applied at the guide 32 and the edge 59 as a horizontal strip 61' on the plate 30 which cooperates with a strip extending along the upper edge of the sheet 44 (inside the lug 65 of FIG. 3) as well as at the center of the target where strips 62' and 62" are fastened to respective unit. The target is finished at the rear by a covering frame 63 and a rear cloth 64 stretched over the latter. I
When the target is to be repaired or its central part is to be exchanged for one having a differently divided target area the covering frame 63 is first removed after which the unit II together with its cabling 54 55 and pin terminal 56 is dismounted. To release the fixing to the plate 30 a pair of freely accessible lugs 65 of the abovementioned fixing strips serving as handles are used. After a new rear unit is mounted on the front unit in the position determined by the guides the target is ready for further use.
It should be pointed out that the mutual position of the units seen in the shooting direction is of significance to ensure a correct ring and sector indication over the whole target area. By placing the unit I comprising the radially outer range of sensitivity of the target (the area elements l to 6' inclusive) nearest to the gunner the signalling in this whole range will be independent of which conducting strip or strips receive contact by the projectile in its continued passage through the target material since the registration on the output side will obviously be set by the first entering impulse while later erroneous impulses will be of no effect. With a reverse mounting, i.e., in case the unit comprising the inner range of sensitivity (the zone 6' to the inner ten inclusive) were placed at the front of the target, a projectile which first hit one of the downleading ring or sector strips 49 or 45 and which should rightly be scored as a hit in one of the outer rings, would on the other hand cause the register to be set to one of the high values within the lastmentioned range of sensitivity or for an erroneous sector position. With the abovementioned correct arrangement, a projectile passing through the conductive sheet first hit, i.e., in the zone 6', will establish, together with the sheet 26, when a hit is scored in the radial merging area between the two units, the effective short circuiting contact that causes correct registration in the hit indicating means of the plant.
The invention is obviously not limited to the above described embodiment but comprises also target devices wherein the number of conductive sheets is more than two and the sheets have other target area divisions than rings and sectors, and comprises every other selfindicating target of the type, including a target area divided into easily separable but cooperating units.
1. A target at which electrically conductive projectiles are to be shot from a location in front of the target and which has defined scoring zones comprising a central zone within which shots are most desirably placed and a plurality of outer zones which lie at different distances outwardly from said central zone and each of which surrounds it, said target being of the type comprising a plurality of pairs of cooperating sheet-like electrically conductive elements that are penetrable by said projectiles, there being at least one of said pairs of elements for each scoring zone and the two elements of each pair being flatwise spaced apart by a distance such that a projectile can be in electrically. connecting contact with both simultaneously during its penetration of them, said target also comprising means for electrically connecting each of said pairs of elements with a scoring device that indicates the particular pair of said elements that a projectile has penetrated, said target being characterized by:
A. a frame large enough to embrace all of said zones;
B. first flat, thin carrier means substantially permanently fixed to the frame near the front thereof and carrying pairs of said elements for an outer portion of one of said outer scoring zones and for the whole of all of the outer scoring zones farther out from the central zone than said one outer scoring zone;
C. second flat, thin carrier means having thereon pairs of said elements for the inner portion of said one outer scoring zone and for the whole of all scoring zones inwardly of said one outer scoring zone;
D. readily releasable fastening means detachably supporting said second carrier means in the frame behind the first carrier means and edgewise in a position in which its said pairs of elements are substantially in register with their respective scoring zones;
E. there being partial but substantial edgewise overlap between said elements for the outer portion of said one outer scoring zone and said elements for the inner portion thereof; and
F. corresponding ones of said overlapping elements on the two carrier means being electrically interconnected so that accurate scoring is obtained of shots placed in the scoring zone for said overlapping elements and in the scoring zones adjacent thereto, notwithstanding any edgewise misregister of the carrier means relative to one another.
2. A target at which electrically conductive projectiles are to be shot from a location in front of the target and which has means defining a front surface on which are delineated defined scoring zones comprising a central circular zone and annular zones concentric to said circular zone and surrounding the same, said target being of the type comprising a plurality of pairs of cooperating sheet-like electrically conductive elements that are penetrable by said projectiles, there being at least one of said pairs of elements for each scoring zone, the elements for each scoring zone being rearwardly in register with their scoring zone, and the two elements of each pair being flatwise spaced apart by a distance such that a projectile can be in contact with both simultaneously during its penetration of them, to electrically connect them, said target also comprising means for electrically connecting each of said pairs of elements with a scoring device that indicates the particular pair of said elements that a projectilehas penetrated, said target being characterized by:
A. a frame on the front of which said means defining said front surface is affixed;
B. the pairs of elements for at least one radially outer scoring zone being carried on flat, thin carrier means substantially permanently affixed to said frame rearwardly adjacent to said means defining said front surface, and said carrier means also carrying elements for the radially outer portion of a radially intermediate scoring zone;
C. the pairs of elements for the radially inner portion of said radially intermediate scoring zone and for the scoring zones radially inward thereof being carried by another flat, thin carrier means;
D. means for readily detachably securing said other carrier means to the frame, behind the first mentioned carrier means and with the pairs of elements on said other carrier means substantially concentric to those on the first mentioned carrier means;
E. the radially outer edge of said elements for the radially inner portion of said radially intermediate scoring zone having a diameter larger than the inside diameter, but smaller than the outside diameter, of the elements for the radially outer portion of said zone so that those elements are in partial radially overlapping relationship; and
F. corresponding ones of the elements on the respective carrier means that are in such radially overlapping relationship being electrically interconnected.
3. The target of claim 2, further characterized by: G. one element of each of said pairs thereof being annular and being radially spaced a small distance from its radially adjacent annular elements;
H. the other element of each of said pairs being substantially sector shaped, extending circumferentially only partway aroundits cooperating annular element, having similar sector shaped elements spaced small distances circumferentially to its opposite sides, and extending radially across a plurality of annular elements, so that each annular element can cooperate with a plurality of sectorshaped elements and each sector-shaped element can cooperate with a plurality of annular elements to provide an indication of both the annular scoring zone penetrated by a projectile and the circumferential portion of that zone that the projectile penetrated.
4. The target of claim 2, further characterized by:
I. said means for radially detachably securing said other carrier means to the frame comprising 1. rearwardly facing strips of self-adhesive material fixed to a portion of the frame, and
2. forwardly facing strips of cooperating selfadhesive material secured to said other carrier means.
5. A target at which electrically conductive projectiles are to be shot, said target being cooperable with a scoring device which can be located remotely from it and which responds to electrical signals from the target to produce indications of scoring results, said target being characterized by:
A. a pair of cooperating plate-like carrier means in flatwise opposing relation to one another, 1. one of said carrier means being substantially permanently mounted and the other being in readily removably secured relation to it, 2. each of said carrier means carrying a. a plurality of concentric annular contact elements of penetrable, sheet-like electrically conductive material, each corresponding to a scoring zone, said annular contact elements being radially spaced apart by small, uniform distances, and
b. other contact elements of such conductive material, flatwise spaced from said annular elements by a distance such that a projectile penetrating an annular element and its flatwise adjacent other element electrically connects them with one another;
B. means providing for electrical connection of each of said contact elements with a scoring device;
C. the radially innermost annular contact element on said one carrier means having an inside diameter smaller than the outside diameter of the radially outermost annular contact element on said other carrier means but having an outside diameter larger than said outside diameter of said radially outermost annular contact element, so that the two last mentioned contact elements are in partial radially overlapping relation to one another and both correspond to the same scoring zone; and
D. means electrically interconnecting the two last mentioned contact elements.