GB2213959A

GB2213959A - Sight for a sports rifle

Info

Publication number: GB2213959A
Application number: GB8900590A
Authority: GB
Inventors: Peter Goepfert
Original assignee: Haemmerli AG
Current assignee: Haemmerli Jagd und Sportwaffenfabrik und Apparatebau GmbH
Priority date: 1988-01-15
Filing date: 1989-01-11
Publication date: 1989-08-23
Anticipated expiration: 2009-01-11
Also published as: CH675474A5; DD283457A5; GB8900590D0; DE3801037C2; GB2213959B; DE3801037A1

Description

J 1 - A SIGHT FOR A SPORTS RIFLE This invention relates to a sight for a

sp-orts rifle comprising a support adapted to be secured to the rifle and carrying a diaphragm which can be moved in the vertical and horizontal directions by respective threaded spindles screwed into internal threads.

A sight of the above description as known from US-A-2 229 637 comprises a compound slide with two threaded spindles, which can be adjusted by means of a respective rotary knob. The horizontal spindle is screwed into an internal thread in the guide of the vertical slide. This vertical guide is loaded axially to one side by a spring. The adjusting knob of the spindle comprises a paraxial blind-end bore, which contains a spring and a locking ball. The latter engages in one of a plurality of locking recesses which are integral with the housing. This known sight has a complicated structure and many lost motion components, which means that it is difficult to set the sight and that this depends in particular on the adjustment direction.

The object of the present invention is to provide a sight which can be set in a precise and repeatable manner. This object is solved in accordance with the invention by a sight for comprising a support and carrying a diaphragm which can be moved in the vertical and horizontal directions by respective threaded spindles screwed into internal threads, in that each spindle is mounted in a bearing the clearance of which can be a sports rifle adapted to be secured to the rifle characterised double-row ball set, and that the associated internal thread is formed in a nut which is preloaded in the radial direction towards the thread of the spindle at least over a part of its length.

An embodiment of the invention will now be described by way of example with reference to the accompanying drawings in which:

Figure 1 is a front view of a sight according to the invention for a sports rifle, and Figure 2 is a section along the line II-II in Figure 1.

Referring to the drawings, the illustrated sight comprises a tubular support 1, which is provided in its lower wall 3 with a dovetail guide 2 for securing it to the barrel of a sports rifle (not shown). The support 1 carries a compound slide 4 for setting an iris diaphragm 5 in the vertical and lateral directions. The compound slide 4 consists -of a vertical slide 6, which can be moved vertically of the support 1, and a cross slide 7 which can be moved horizontally of the slide 6. Respective setting knobs 8 and 9 are used to move the slides 6 and 7.

The setting knob 8 is mounted on a vertical threaded spindle 14. The spindle 14 is in turn mounted in a double-row ball bearing 15, the clearance of which can be set. The outer races 16 of the two ball bearings are inserted from opposite sides in a bore 17 in a plate 18 which is screwed to the support 1, and rest by way of radial flanges 19 against the plate 18. The two inner races 20 are pushed onto a cylindrical section 21 of the threaded spindle 14. One inner race 20 rests against a flange 22 of the threaded spindle 14. The other inner race 20 rests aoainst a setting nut 25 which is screwed onto a fine thread 26 at the upper end of the spindle 14. The nut 25 has a radial slot 27 and can be tensioned for securing purposes by tightening a grub screw 28. grooves 32 which pass through in the axial direction and are distributed regularly over the circumference, is pressed onto a cylindrical collar 30 of the nut 25. The spherical head of a locking bolt 33 projects from below into one of the grooves 32. The locking bolt 33 is-mounted in a through-bore in the plate 18 such that it can move in the longitudinal direction and is loaded upwardly by a spring 34. Two engaging lugs 35 of a setting drum 36 project from above into two of the grooves 32. The drum 36 is preloaded downwardly by a spring 37 supported against a ring 39 which is held on the nut 25 by a retaining ring 38 and which at the same time guides the drum 36. The drum 36 is covered at the front end by a top 40. The grooves 32 are covered by a sleeve 41 which is pushed onto the drum 36. Indicia 42, one of which is designated as 0, are applied to the sleeve 41 at regular intervals according to the groove spacing. A corresponding cursor marking. line 43 is applied to the rear side of the plate 18, so that the marksman can see the setting when aiming the rifle.

The spindle 14 is screwed into a nut 47 of a plastics material, the internal thread 48 of which is undersized. The nut 47 comprises a cylindrical shank 49 and a flange 50 with two paraxial through-bores for fastening screws 51. The shank 49 is inserted in a stepped through-bore 52 in the vertical slide 6. Adjacent to the shank 49 the nut 47 comprises a section 53 which tapers conically towards the end. A ring 55, which is countersunk in a corresponding conical manner and which is loaded upwardly by a spring 54, is disposed on the conical surface of this taper 53. The spring 54, in conjunction with the ring 55, the conical taper 53 and the material of the nut 47, produces an engagement between the nut 47 and the spindle 14 which is free from play for a long period.

Only one rail 59, which is secured to the support 1, of the longitudinal ball guide of the vertical slide 6 is shown in Figure 2. However this longitudinal guide is of the same structure as the longitudinal guide of the cross slide 7 shown in cross section in Figure 2, the latter comprising two rails 60 arfd 61 which are secured to the vertical slide 6 and both of which are fixed by screws 62 to the slide 6 at a right angle to the plane of the two rows of balls 63 of the longitudinal guide. The rail 60 rests at the bottom against a projection 64. The rail 61 rests at the top against a row of grub screws 65. The balls 63 roll in longitudinal grooves 66 in both rails 60 and 61 and in longitudinal grooves 67 in the cross slide 7. The clearance of the longitudina by the grub screws 65 after th been loosened.

The setting knob 9 is of the same structure as the setting knob 8, although in this case the plate 181 corresponding to the plate 18 is secured to the slide 6. The cursor marking 431 is applied to a cap 71, which is secured to the slide 6 by screws 70, instead of to the plate 181. The nut 47 for horizontal adjustment is secured to the cross slide 7 by the screws 51.

The cross slide 7 comprises a tapered bore 75 in the direction of the line of sight. An iris diaphragm part, which is not shown in Figure 1, with a diaphragm aperture 77 is screwed into this bore. An oblong hole 78, 79 extends through the slide 6 and. the cap 71 at the level of the bore 75.

The double-row ball bearings 15 and the longitudinal ball guides are set to a very small clearance. As the threaded engagement of the spindles 14 is also free from play, a high degree of precision in setting the iris diaphragm 5 by means of the setting ball guide can be set upper screws 62 have i 1 1 In knobs 8, 9 is obtained, in fact a setting which is independent of the adjustment direction. When the sight is set, the marksman can set the indicia 42 "to zerC by raising the drum 36, turning the mark 0 to the cursor line 43 and letting the lugs 35 engage in this position. The marksman can thus carry out any fairly sm-all additional corrections in the further course of the shooting procedure. The sight is extraordinarily robust due to the tubular support 1 and the compact structure.

W

Claims

C L A I M S

1. A sight for a sports rifle comprising a support adapted to be secured to the rifle and carrying a diaphragm which can be moved in the vertical and horizontal directions by respective threaded spindles screwed into internal threads, characterised in that each spindle is mounted in a double7.row ball bearing the clearance of which can be set, and that the associated internal thread is formed in a nut which is preloaded in the radial direction towards the thread of the spindle at least over a part of its length.

2. A sight according to Claim 1,- wherein the nut tapers conically towards one axial end, and a ring which is loaded in the axial direction of the spindle by a spring is disposed on the conical taper.

3. A sight according to Claim 2, wherein the nut consists of a plastics material and the ring has a conical countersink which is disposed on the taper.

4. A sight according to Claim 3, wherein the nut comprises a flange which is secured by screws.

5. A sight according to any one of Claims 1 to 4, wherein a locking disc comprising locking recesses is connected to the threaded spindle in a non-rotatable manner, and a spring-loaded locking component engages in the locking recesses.

so recesses, 7.

6. A sight according to Claim 5, including a setting drum secured to the threaded spindle such that it can rotate and be moved in a limited manner in the axial direction,, the drum being preloaded by a second spring that a part thereof engages in the locking and indicia around the periphery of the drum.

A sight according to Claim 6, wherein the 4 r X locking recesses in the locking disc directed.

8. A sight according to Claim 7, whereinthe locking recesses are axial grooves on the periphery of the locking disc.

9. A sight according to any one of Claims 1 to 8,- wherein the diaphragm is arranged in a compound slide with longitudinal ball guides whose clearance can be set.

10. A sight according to any one of Claims 1 to 9, wherein the support is tubular.

11. A sight for a sports rifle, substantially as hereinbefore described with reference to the accompanying drawings.

are a x i a 11 y Published 1988 1 The tent Office. State-House, 66"71 High Holborn, London WCIR 4TP. Further copies may be obtained from The Patent Oface, Sales Branch, St Mary Cray. Orpington, Kent BR5 3RD. Printed by MWtiplex techniques ltd. St Mary Cray. Kent. Con. V87.