Precision engineering device

March 19, 1963 g. heerklotz 3,081,902

PRECISION ENGINEERING DEVICE

Filed Dec. 28, 1959

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Attorney

United States Patent Office , ,. _M³’®⁹¹;⁹®²

Patented Mar. 19, 1963

3,081,902

PRECISION ENGINEERING DEVICE Giinter Heerklotz, Dresden, Germany, assignor to VEB

Kamera- und Kinowerke Dresden, Dresden, Germany Filed Dec. 28, 1959, Ser. No. 862,108

Claim. (Cl. 220—46)

The invention relates to still and movie cameras and projectors, wherein the working parts are covered by a casing which consist of two or more members, the abutting edges thereof having to fit together in light- and dusttight manner.

In known designs the contiguous edges of the casing members engage positively with one another. For instance, two members can engage one over another or one member can be formed with a groove into which the other member is pressed. A disadvantage of this arrangement is that the connections are complicated to manufacture by casting or machining and must be produced to high standards of accuracy. Also, connections of this nature detract from the overall impression given by modern designs of aesthetic appearance, apart from failing to ensure light- and dust-tight closure of the working parts encased.

It is an object of the invention to obviate these disadvantages and to provide other advantages. To this end, the contiguous edges of members forming casings which cover the working parts, such as cases, covers or the like bear against one another by way of smooth surfaces and a resilient strip is placed therebetween. The same has a beaded edge and is made preferably of rubber, leather or plastic. The strip is formed with recesses on the edge opposite the bead, for adaption to the shape of the members which it is required to interconnect. The strip can be colored, thus combining usefulness with a pleasant appearance. The strip compensates for manufacturing inaccuracies in the connecting areas and ensures a strong light- and dust-tight fit of the members joined together.

The invention will be explained in greater detail with reference to a constructional form thereof as applied to a photographic camera, details which do not directly bear upon the invention being omitted.

In the attached drawings, wherein like reference numerals refer to like parts:

FIGURE 1 shows a perspective view of a photographic camera embodying the invention;

FIGURE 2 shows a fragmentary cross sectional elevational view along the line II—Π of FIGURE 1;

FIGURE 3 shows in plan view a resilient strip used to seal the pace between different portions of the casing of the camera shown in FIGURE 1;

FIGURE 4 is a side elevational view of the resilient strip along the line IV—IV of FIGURE 3;

FIGURE 5 is a horizontal cross-sectional view of the camera casing along the line V—V of FIGURE 1; and

FIGURE 6 is a vertical cross-sectional view of the camera casing along the line VI—VI of FIGURE 1.

Referring to the drawings in detail, the camera is formed by an open top housing 10 having a front wall 11, side walls 12 and 13, a rear wall 14 and a base 15. The respective upper edges 16, 17, 18 and 19 of the walls 11, 12, 13 and 14 lie in a horizontal plane. Around the edges 16, 17, 18 and 19 there is placed a colored resilient strip 24 (shown in FIGURES 3 and 4) which is provided with a bead 25 along one side and arcuate cut-away portions 26 defined by spaced projections on the other side whereby the resilient strip 24 can conform to the contours of the edges 16, 17,18 and 19.

A cover cap 27 bears on the beaded strip 24 as shown in FIGURES 1, 2 and 6. The cover cap 27 comprises a top portion 28, a front wall 29, side walls 30 and 31 and a rear wall 32. The respective lower edges 33, 34, 35 and 36 of the walls 29, 30, 31 and 32 lie in a horizontal plane and register with the edges 16, 17, 18 and 19 of the housing 10, being separated therefrom by the strip 24, which is disposed between the contiguous edges 16 5 and 33, 17 and 34, 18 and 35, 19 and 36 respectively, with the bead 25 disposed exteriorly of the said edges. An upper central portion of the wall 11 of the housing 10 and a central portion of the cap 27 are open at the front, the cap 27 having an upper horizontal front edge 10 39 and two laterally inclined side edges 40 and 41 (41 being not visible in FIGURE 1, but a mirror image of the edge 40).

The cover cap 27 is secured to the housing 10 by tags such as 21.

A front cover 44 is formed with an upper portion 45 and a lower portion 46. The upper portion 45 forms a front closure of the open central portion of the wall 29 and has an upper horizontal edge 47 and laterally inclined edges 48 and 49 (the edge 49 being not visible in 20 the drawings, but a mirror image of the edge 48). The edges 47, 48 and 49 register with the edges 39, 40 and 41 respectively of the cover cap 27.

The lower portion 46 of the front cover 44 has vertical upper rearward edges 50 and 51 and a semi-circular 25 lower rearward edge 52. An aperture 53 is provided in the lower portion 46. A colored resilient strip 54 of the same construction as strip 24 is provided between the edges 47 to 52 inclusive of the front cover 44 and the housing 10. The strip 54 has on one side a beaded por30 tion 55 similar to the beaded portion 25 on the strip 24.

The front cover 44 is attached to the housing 10 by screws 58 with the edges 47, 48 and 49 in registry with the edges 39, 40 and 41 respectively of the top cover 27 and with the edges 50 to 53 bearing through the resilient 35 strip 54 on the front wall 11 of the housing 10, the resilient strip 54 being disposed also between the edges 39 and 47, 40 and 48, 41 and 49. The beaded portion 55 of the strip 54 is disposed exteriorly of the edges of the front cover 44.