RU1778745C - Device for clamping interchangeable lens - Google Patents

Abstract

Usage: film technology. SUMMARY OF THE INVENTION: in a device containing a bayonet ring, an adept ring with a thread for fastening an interchangeable lens therein to a locking pin between the bar and the return spring, a locking lever is installed with a bend located in a radial groove made in the bayonet ring, while the bend is installed with the ability to enter a radial groove made in the adapter ring. 4 ill.

Description

The invention relates to the field of film photographic technology.

A device for attaching interchangeable threaded lenses to a camera is known, which comprises a threaded adapter ring provided with a leaf spring fixed to its outer diameter 1.

The disadvantage of this device is the inconvenience of its operation.

The closest in technical essence to the invention is a device for mounting interchangeable lenses of a SLR camera, containing a K-type bayonet ring (GOST 24692-81) mounted on the camera with a sector recess made on the surface serving as a support for the attached lens, a threaded adapter ring for attaching interchangeable threaded lenses, made with a radial locking protrusion on its outer

ring circuit, as well as a locking pin spring-loaded with a return spring, mounted fixedly on the bar with the button of the bayonet ring and fixing the adapter ring with an interchangeable lens 2.

A drawback of this device for attaching interchangeable lenses is the presence of a sector recess device on the surface of a type K bayonet ring (GOST 24692-81), which serves as a support for the attached lens. Sector deepening makes it difficult to obtain the necessary flatness on this surface and, as a result, ensuring reliability due to distortions that occur, and the protrusion on the outer ring contour of the adapter ring does not provide the necessary fixation.

The aim of the invention is to increase the reliability of the device.

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The goal is achieved by the fact that the device for attaching interchangeable lenses, comprising a bayonet ring for mounting on the camera, an adapter threaded ring mounted to interact with the bayonet ring, and also a spring-loaded locking pin fixedly mounted on a bar with a key, equipped with a locking a pin between the bar and the return spring with a fixing lever with a bend located in the radial groove made in the bayonet ring, while the bend is installed with the ability to enter a radial groove made in the adapter ring.

In FIG. 1 shows a general view of a device for attaching a replaceable threaded lens to a camera through an adapter ring; in FIG. 2 is a section AA of FIG. 1; in FIG. Figure 3 shows a general view of a device for attaching a replaceable lens with a bayonet mount to the camera; in FIG. 4 is a section BB of FIG. 3.

The device comprises a bayonet ring 1 mounted on the camera with a radially located through groove 2 on its inner ring contour, an adapter ring 3 with a thread 4 for fixing an interchangeable threaded lens 5 with a supporting surface 6, made with a radial through groove 7 on its outer ring contour . The locking pin 8 of the bayonet ring 1 is mounted motionlessly on the bar 9 with the key 10. On the locking pin 8, between its return spring 11 and the bar 9, the locking lever 12 with the bend 13 is placed with the possibility of movement along its axis. In addition, the device it is provided for mounting not only a replaceable threaded lens 5, but also a replaceable lens 13 with a bayonet mount, on the supporting surface 15 of which a groove 16 is made, as well as a ledge 17 (Figs. 3 and 4).

The device operates as follows.

The interchangeable lens 5 with thread 4 is attached to the SLR camera with the bayonet ring 1 by means of the adapter ring 3, which is inserted into the bayonet ring 1, rotates and the grooves 2 and 7 are aligned at the same time.

and the groove 2 of the ring 1, the bending 13 of the lever 12 under the action of the spring 11 enters the groove 7 of the adapter ring 3. Then, the interchangeable lens 5 with thread 4 is screwed into the adapter

ring 3, wherein the locking pin 8 is held in place by the abutment surface 6 of the interchangeable lens. Release interchangeable lens 5 together with adapter ring 3 from the bayonet mount

ring 1 is carried out after withdrawal of the folding 13 of the lever 12 from the groove 7 of the adapter ring 3 by moving the strap 9 by pressing the key 10 (Fig. 1).

The interchangeable lens 14 with the bayonet mount is mounted on the camera by inserting it into the ring 1 and turning it until the groove 16. is made on the supporting surface 15 of the lens 14 with the locking pin 8, which

the action of the spring 11 will enter the groove 16. In this case, the bending 13 of the lever 12 is held by a step 17 made on the lens 14. The removable lens 14 with the bayonet mount from the ring 1 is released after the locking pin 8 is withdrawn from the groove 16 by moving the bar 9 with the key 10 when pressing the key 10 (Fig. Zi4).

In the device for attaching interchangeable

the reliability of its operation is increased, since it provides the necessary flatness of the supporting surface of the bayonet ring and the degree of fixation of the interchangeable lens.

Claims (1)

SUMMARY OF THE INVENTION A device for attaching interchangeable lenses, comprising a bayonet ring for mounting on a camera, an adapter threaded ring mounted to interact with the bayonet ring, and a spring-loaded retention pin fixedly mounted on a key rail. characterized in that, in order to increase reliability, it is equipped with a fixing lever with a bend located on the locking pin between the bar and the return spring, located in made in the bayonet ring of the radial groove, while the bending is installed with the possibility of entering the radial groove made in the adapter ring. (Riga 1 d-4 m Ge /} well / 770 V / J f FIG. Z / sixteen C- & o6e0H1 // 7 o / I f t Vul3