Abstract:
A sight device for an archery bow comprises a sight arm adjustably attached to the bow. A support for a lens is secured to the sight arm. The support is vertically adjustable. The support includes a horizontally adjustable arm and two attachment lugs ( 45, 46 ). The attachment lugs are compressible to hold the lens.

Description:
This is a continuation-in-part of application(s) U.S. Ser. No.(s) 09/227,796 filed on Jan. 8, 1999 now U.S. Pat. No. 6,026,799. 
    
    
     The present invention relates to a device for a sight for a bow consisting of a sight arm capable of connection to an attachment plate attachable to the bow, which arm has means for the angular adjustment of the sight in the lateral sense and a lateral adjustment unit and a holder for a scope sight lens attachable thereto. 
     A scope sight previously disclosed through U.S. Pat. No. 5,509,402, for example, comprises a threaded shaft to which the sight is secured. This means that this shaft is bent when it is wished to adjust the scope, causing the shaft to break off as a result. U.S. Pat. No. 5,507,272 presents a sight in which a supporting shaft is clamped securely to the free end of a sight arm. Adjustment in the lateral sense is not easy, however, with this previously disclosed sight. U.S. Pat. No. 5,524,601 presents an adjustable sight with a simple threaded rod and a locking means capable of removal together with it and capable of actuation for the adjustment of the sight in the longitudinal sense, but not in the vertical sense. 
     The principal object of the present invention is, in the first instance, to make available a sight device which permits simple adjustment of the various parts of the sight to be achieved. 
     The aforementioned object is achieved by means of a device in accordance with the present invention, which is characterized essentially in that the attachment plate exhibits a number of vertically arranged grooves, in which matching longitudinal grooves on the sight arm are capable of being accommodated at the desired level, with the attachment arm and the attachment plate being capable of being screwed securely to one another, in that the sight arm exhibits an articulated shaft extending vertically in the form of a cylinder, which, when in its set angled position, a holder is so arranged as to grip and clamp securely, in that the lateral adjustment unit is adjustably attached in the vertical sense by means of screws capable of being accommodated in grooves, which screws can be screwed into the holder in the desired vertical position, and in that the scope sight attachment can be split and clamped together for the purpose of securing a lens therein. 
     BRIEF DESCRIPTION OF THE DRAWINGS 
     The invention is described below with reference to the accompanying drawings, in which: 
     FIG. 1 shows a perspective view of a sight device viewed at an angle from the rear; 
     FIG. 2 shows the sight device viewed at an angle from the front; 
     FIG. 3 shows the sight device viewed from above; 
     FIG. 4 shows a partial view of a clamping component in the sight device; 
     FIG. 5 and 6 show part of the sight device viewed from the side and from above; 
     FIG. 7 shows the part of the sight device viewed from the front; 
     FIG. 8 shows a detail of the vertical adjustment of the sight; 
     FIG. 9 shows a scope sight lens holder viewed from different directions; 
     FIG. 10 shows the holder viewed from the front; 
     FIG. 11 shows the holder in the installed position on the part of the sight device; 
     FIG. 12 shows a means for locking a sight unit on a guide; 
     FIG. 13 shows a locking device acting against a lead screw; and 
     FIG. 14 shows a further sight device according to the invention. 
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     A device  1  in accordance with the present invention for a sight  2  for a bow  3  consists of a sight arm  5  capable of connection to an attachment plate  4  attachable to the bow  3  by means of a screw, which arm has means  6  for the angular adjustment of the sight  2  in the lateral sense  7 ,  8  and a lateral adjustment unit  9  and a holder  10  for a scope sight lens  11  attachable thereto. In accordance with the invention, the attachment plate  4  exhibits a number of vertically  12 ,  13  arranged grooves  14 , in which two matching and longitudinally thickened grooves  15  on the sight arm  5  are capable of being accommodated at the desired level  16 , with the attachment arm  5  and the attachment plate  4  being capable of being screwed securely to one another. 
     The sight arm  5  exhibits a cylindrical articulated shaft  17 , which extends vertically  12 ,  13 , and which, when in its set angled position, a holder  18  is so arranged as to grip and clamp securely. 
     The lateral adjustment unit  9  is attached so that it is adjustable in the vertical sense  12 ,  13  by means of screws  19  capable of being accommodated in grooves  51 , which screws can be screwed into the holder  18  in the desired vertical position. 
     The aforementioned scope sight lens holder  10  can be split and clamped together for the purpose of securing a lens  11  therein. 
     The aforementioned lateral adjustment unit  9  is formed by a U-shaped yoke  20 , which is provided with a threaded rod  23  and guides  24 ,  25  extending between its legs  21 ,  22  for the purpose of supporting a sight holder  26  capable of adjustment to the desired vertical position along them, from which sight holder a laterally  27  extending adjustable arm  28  is arranged for supporting the scope sight lens holder  10  at its one end  28 A. 
     The aforementioned lateral adjustment arm  28  can be clamped securely between the sight holder  26  and a tightening arrangement  29 , preferably a screw  25  capable of being screwed into the sight holder  26 , and carried a threaded shaft  31  extending all the way through a threaded hole in the sight holder  26  in an angled part  30  at its end  28 B facing away from the scope lens holder  10 . 
     A vertical groove  51  extends through the base part  32  of the U-shaped yoke, and a laterally enlarged locking part  33 , preferably an elongated locking part in the form of a washer with two screw holes  3 , is capable of being accommodated so that it is capable of displacement on one side of the groove. 
     The aforementioned holder  18  exhibits a vertical, cylindrical accommodating space  34 , which is intended to accommodate the articulated shaft  17 , and has pairs of shaped clamping arms  35 ,  36  extending from it, through which holes  37 ,  38  extend for the purpose of accommodating a clamping screw  39  or some other locking device, which extends through a hole  40  in the enclosed end  5 A of the sight arm  5 . 
     The aforementioned arm  28 , which is intended to support a scope sight lens  11 , is formed inter alia by a two-part cylindrical lens accommodating part  41 ,  42  on the intended holder  10  of the arm. Attachment lugs  45 ,  46  provided with screw holes  43 ,  44 , which are situated at the free ends of the accommodating parts, are capable of being clamped together by means of a clamping screw  47  that can be screwed in to reduce the effective width of the lens accommodating part, thereby clamping a lens securely in the housing. 
     The aforementioned threaded rod  23 , which is provided for the vertical adjustment of the sight holder  26 , is attached to a knob  48 , by means of which a spring-actuated ball  49  of some other locking body is so arranged as to interact with a recess in the knob  48  to provide click adjustment in conjunction with the vertical setting of the sight unit. 
     A level  50  is supported by the lateral adjustment unit  9  to enable the bow to be aligned correctly when it is wished to shoot it. 
     The function of the various components is summarized below with reference to the Figures: 
     FIG.  1 : The attachment plate  4  for the sight arm  5  has three V-section milled grooves  14 , and the sight arm  5  has two V-section milled profiles  15 , which run in the grooves  14 . The sight arm can be set to three different heights. This pressure socket provides engagement of the sight that is 100% identical every time the sight is assembled. 
     FIG.  3 : The sight arm  5  has angular adjustment  6  in the lateral sense  7 ,  8  of the sight which is of a new type, which engages around a round bar  17  and provides very secure locking. 
     FIGS.  3  and  11 : The sight has a lateral adjustment that is installed from the front on the sight yoke and against the lateral adjustment on the sight arm. Present-day sights have this adjustment from the opposite direction, i.e. from the rear. 
     FIGS.  5 - 7 : Our adjustment includes the possibility of adjusting the entire sight unit vertically up and down and steplessly in the milled groove on the sight yoke. Present-day sights are adjusted in this way from the rear side in fixed positions by moving the sight arm and locking it to the sight in pre-drilled holes arranged at different relative distances. 
     FIGS.  11 - 13 : The adjustment for the sight unit runs in two guides. This means that the adjustment follows a precise path as adjustment is made. A threaded rod is located between these two guides. This enables the sighting point to be adjusted vertically upwards and downwards by slackening the knob by a quarter of a turn, thereby releasing the locking function that also takes place when it is tightened. Once the knob has been slackened by a quarter of a turn, adjustment is possible by rotating the knobs that are present on the sight unit on the top side and bottom side of the sight yoke. If it is wished to adjust over a greater distance in a single move, the knob is slackened by further 1½ turns, whereupon the knob is pushed in to release the part that is in contact with the threaded rod, which permits the adjustment device to be slid as far as desired. Once the adjustment has been made, the knob is retightened and becomes securely locked against the threaded rod. As additional security, we have a locking screw that locks against the innermost guide. Today&#39;s sights do not lock against the threaded rod and do not lock against any guide. 
     FIGS.  9 - 11 : The lateral adjustment means that is installed on the sight unit is manufactured as a single unit. The scope and a sight pin, if any, are located on this. This lateral adjustment means runs in two V-section milled profiles, which run in two V-section milled grooves on the sight unit. This functions in the same way as the attachment of the sight arm to the sight plate in the first paragraph. The lateral adjustment can be adjusted after slackening the locking screw and rotating the lateral adjustment knob on the side. The scope (magnifying lens) is attached directly to the lateral adjustment unit, which has an outer ring with a locking screw on the side. The scope is pushed into this ring, where it can be adjusted by rotating it to the desired position and then locking it securely. Previously disclosed sights are not manufactured in this way with a whole lateral adjustment unit, and the scope itself can be adjusted individually directly in the lateral adjustment unit. The sights that are available today are secured to a threaded shaft, which is then secured to the sight. This means that this shaft is bent in order to adjust the scope, with the result that the shaft pulled off. Our adjustment of the scope, together with the fact that the lateral adjustment unit is manufactured in a single piece, means that this problem is avoided. 
     FIG.  9 : The scope  11  is a separate unit and is thus easy to replace, if the need arises, without having to disturb the lateral adjustment. In the case of present-day sights, it is necessary to recalibrate the bow after having replaced the scope. 
     The present scope will also be supplied with two lenses,  11 A,  11 B, which are polarizing; i.e. it must be possible to make the lens darker or lighter, as desired, for example when shooting into the sun, picking up the sun in the scope and being blinded. It is possible in this case to rotate one of the lenses steplessly to make it darker or lighter, as required. A locking means  52  is provided to lock the rotation of the lenses to one another. 
     The invention is not restricted to the illustrative examples described above and shown in the drawings, but may be varied within the scope of the Patent Claims without departing from the idea of invention. 
     FIG. 14 shows a further embodiment of a device  102  for a sight  111 . A sight arm  105  having means for connecting the sight arm  105  to a bow. A sight holder  126  being adjustable to the sight arm  105  and a laterally  127  extending arm  128  for supporting a sight lens holder  110  being connected for lateral adjustment to said sight holder  126 . By a screw  129  the arm is screwed into the sight holder  126 . The sight holder  126  carries the threaded shaft  131 . 
     By means of a clamping screw  147  the two clamping lugs  145 ,  146  are clamped together. The effective width of the lens accommodating part thereby clamping a lens  111  securely in the housing  110 .