JPH0263041A - Fitting structure for pressure plate - Google Patents

Abstract

PURPOSE:To decrease the number of components and facilitate the assembly, and to increase the thickness of the pressure plate in a specific space by sliding the pressure plate in the lengthwise direction of a long hole while the pressure plate is pressed, engaging engagement parts with each other, and fitting the pressure plate so that the pressure plate does not fall from a rear lid. CONSTITUTION:A coil spring 39 is fitted to the boss 32 of the rear lid 30, then the pressure plate 40 is moved toward the rear lid 30 so that the boss 32 is inserted into the long hole of the pressure plate 40, and the pressure plate is pressed so that the oil spring 39 contracts. Then while said pressure plate 40 is pressed, the pressure plate 40 is slid upward and moved to a position shown by a broken line. Then the pressure plate 40 is fitted to the rear lid 30 at the broken-line position so that it does not fall; when the pressure plate 40 is released at this position from being depressed, the pressure plate 40 is pressed upward by the coil spring 39 to float above the rear lid 30 by the elasticity. Consequently, the number of components is small and the thickness of the pressure plate is made large in the specific space.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a mounting structure for a pressure plate, and more particularly to a mounting structure for a pressure plate attached to the back cover of a camera.

[Conventional technology]

On the back of the camera body, there is a back cover that opens and closes when loading and unloading the film.This back cover is equipped with a pressure plate that presses the film against the film guide rail with the action of a spring and maintains the flatness of the film. It will be done.

Conventionally, this kind of pressure plate was attached by passing the leaf spring 14 and the pressure plate 16 through the bosses 12 and 12 set on the back cover 10, and then pressing the leaf spring 14 and then pressing the pressure plate 16. This was done by screwing the upper round screw 18.18 into the boss 12.12.

Another method for attaching the pressure plate is to provide a spring engaging portion 20.2o on the back cover as shown in FIG. ,
This was done by hooking the engaging portions 24A, 24A, . . . of the leaf spring 24 to the engaging portions 20, 20, .

[Problem that the invention seeks to solve]

In the case of the conventional pressure plate mounting structure shown in FIGS. 5 and 6 above, screws and bolts are required, which increases the number of parts and the number of assembly steps.

In addition, in recent years, plastic pressure plates have been used to reduce the weight and cost of cameras, but plastic pressure plates have less rigidity than the generally used aluminum pressure plates, so they can be used in limited spaces. It is necessary to increase the thickness as much as possible. However, if the back covers of FIGS. 5 and 6 are designed within the same space, the pressure plate 22 of FIG.
It is not possible to make the pressure plate as thick as the pressure plate 16 shown in the figure, and therefore the material for the pressure plate 22 has been limited to metals with high rigidity.

The present invention was made in view of the above circumstances, and an object of the present invention is to provide a mounting structure for a pressure plate that has a small number of parts, is easy to assemble, and allows the thickness of the pressure plate to be increased within a predetermined space. do.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a boss and a first engaging portion on the back cover that is opened and closed when attaching and detaching the film, and a long hole into which the boss is inserted. A pressure plate for holding the film including a second engagement portion that engages with the first engagement portion is integrally molded from plastic, and after a coil spring is passed through the boss, the boss is inserted into the long hole of the pressure plate. The pressure plate is pressed toward the back cover so as to be inserted, and in this pressed state, the pressure plate is slid in the longitudinal direction of the elongated hole, thereby causing the first and second engaging portions to engage with each other. It is characterized by being attached to the back cover in such a way that it cannot be removed from the back cover and has elasticity due to a coil spring.

[Effect]

According to the present invention, the back cover is provided with the boss and the first engaging portion,
On the other hand, the pressure plate is molded from plastic. This plastic pressure plate has a long hole into which the boss is inserted, and a second
The engaging part is integrally molded. The first and second engaging portions are configured to engage with each other by passing the coil spring through the boss and then moving the pressure plate in a predetermined order.

That is, the first and second engaging portions press the pressure plate toward the back cover so that the boss is inserted into the elongated hole of the pressure plate, and in this pressed state, slide the pressure plate in the longitudinal direction of the elongated hole. engage with each other. As a result, the pressure plate is attached to the back cover so that it cannot fall off from the back cover and has elasticity due to the coil spring.

〔Example〕

Preferred embodiments of the pressure plate mounting structure according to the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is an exploded perspective view showing an embodiment of a pressure plate mounting structure according to the present invention. In the figure, 30 is a back cover, 39 is a coil spring, and 40 is a pressure plate.

The back cover 30 is provided with bosses 32, 32 into which coil springs 39, 39 are loosely inserted, and a pair of overhangs 34A, 34B and overhangs 36A, 36B, respectively.
and convex portions 38A and 38B are provided.

On the other hand, the pressure plate 40 has elongated holes 42 and 42 formed on its lower surface, and a pair of protruding pieces 44A and 44, respectively.
B, protruding pieces 46A, 46B and removal prevention claws 48A, 4
8B is formed. In addition, these long holes 42, 42,
The pressure plate 40 including the protruding pieces 44A, 44B, 146A, 46B and the removal prevention claws 48A, 48B is integrally molded from plastic.

Next, the case where the pressure plate 40 is attached to the back cover 30 will be described.

In FIG. 1, the coil spring 39.39 is first passed through the boss 32.3 of the back cover 30, and then the long hole 42.39 of the pressure plate 40 is passed through.
Move the pressure plate 40 toward the back cover 30 so that the boss 32.32 is inserted into the coil spring 39.39.
Press so that it degenerates.

FIG. 2 is a plan view showing the pressing state of the pressure plate 40. As shown in the same figure, in this state, the boss 32.32 is located above the elongated hole 42.42 in FIG.
8A and 48B are overhang 34A on the back cover side, respectively.
34B, 36Δ, 36B and the convex portions 38Δ, 38B.

Furthermore, FIG. 3 is an enlarged cross-sectional view taken along the line A-A in FIG. A gap H is created between them, and after the pressure plate 40 is attached, the pressure plate 40 can move up and down by the stroke of this gap H.

Next, while pressing the pressure plate 40, the pressure plate 40 is slid upward in FIG. As a result, the pressure plate 40 moves to the position indicated by the broken line. In this position, the claws 48A and 48B for preventing the pressure plate 40 from being pulled out are connected to the protrusions 38A and 38 on the back cover side.
．． In order to overcome B, the pressure plate 40 cannot move downward in FIG.

In addition, the four protruding pieces 34A and 348136A of the pressure plate 40
, 36B are the four overhangs 34 on the back cover side.
A, 34B, 36A, and 36B, and thereby the pressure plate 40 is restricted from moving in a direction perpendicular to the plane of the paper in FIG. Furthermore, as shown in Figure 1,
The four overhangs 34A, 34B, 36A, and 36B are formed in a hook shape, and the four protruding pieces 34 of the pressure plate 40
A134B, 36A, 36B have four overhangs 34
A, 34B, 36A, and 36B are in contact with the walls perpendicular to the back cover 30, and therefore cannot be moved above the broken line position in FIG.

That is, the pressure plate 40 is non-removably attached to the back cover 30 at the position indicated by the broken line. Furthermore, when the pressure plate 40 is released from the pressure at this position, the pressure plate 40 is pushed up by the coil springs 39 and 39 and is lifted up from the back cover 30 with elasticity (
(See Figure 3).

FIG. 4 is a perspective view showing another embodiment of the pressure plate mounting structure according to the present invention. Note that parts common to those in FIG. 1 are denoted by the same reference numerals, and explanation thereof will be omitted.

As shown in Figure 4, there are four overhangs 54 on the camera back 50.
A, 54B, 56A, 56B are provided. These overhangs 54A, 54B.

56A, 56B and overhang 34A134B in Figure 1
, 36A, and 36B, there is an overhang of 54A.
, 54B, 56A, and 56B have protruding pieces 44 of the pressure plate 60.
A, 44B, 46A, and 46B are different in that they also have a hook-shaped wall portion on the entry side. Note that these wall portions have gaps into which the protruding pieces 444, 44B, 46A, and 46B can enter only when the pressure plate 60 is pressed against the back cover 50.

On the other hand, the pressure plate 60 is substantially the same as the pressure plate 40 shown in FIG. 1, and differs from the pressure plate 40 in that the pressure plate 40 is not provided with claws 48A, 48B for preventing removal of the pressure plate 40.

Above pressure! When attaching the f60 to the back cover 50, attach the coil spring 39 to the boss 32, 32 in the same way as the pressure plate 40 in FIG.
．． 39, the bosses 32 and 32 are inserted into the elongated holes 4 of the pressure plate 60.
2.42, press the pressure plate 60 toward the back cover 50, and in this pressed state insert the pressure plate 60 into the elongated hole 42.42.
42 in the longitudinal direction. As a result, the pressure plate 6
0 protruding pieces 44A, 44B, 46A, 46B are overhangs 54A, 54B, 56A, 56B on the back cover side, respectively.
engage with.

Here, since the pressure plate 60 is constantly pushed up by the coil springs 39 and 39, the pressure plate 60 is
protruding pieces 44A, 44B, 46A.

46B are overhangs 54A and 54B on the back cover side.

It never leaves 56A and 56B.

Note that the engagement part provided on the back cover side and the engagement part provided on the pressure plate side are not limited to those in this embodiment, and various types can be considered. Any type of device may be used as long as the two can be engaged by sliding the pressure plate in this state.

〔Effect of the invention〕

As explained above, according to the mounting structure of the pressure plate according to the present invention, the number of parts is small, and there is no need for screwing or caulking, making assembly easy. Furthermore, the thickness of the pressure plate can be increased within a predetermined space, and an inexpensive pressure plate made of plastic can be used.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view showing an embodiment of the pressure plate mounting structure according to the present invention, Fig. 2 is a plan view when the pressure plate is attached, and Fig. 3 is an enlarged cross-sectional view taken along line A-A in Fig. 2. 4 are exploded perspective views showing other embodiments of the pressure plate mounting structure according to the present invention, and FIGS. 5 and 6 are exploded perspective views showing conventional pressure plate mounting structures, respectively. 30.50...Back cover, 32.
...Boss, 34A, 34B, 36A, 36B, 54A
, 54B. 56A, 56B...overhang, 38A, 38
B... Convex portion, 40.60... Pressure plate, 42...
Long hole, 44A, 44B, 46A, 46B... protruding piece,
48A, 48B...Claws to prevent removal.

Claims (1)

[Scope of Claims] A boss and a first engaging part are provided on the back cover that is opened and closed when attaching and detaching the film, and a long hole into which the boss is inserted and a second engaging part that engages with the first engaging part. A pressure plate for holding the film including an engaging portion is integrally molded from plastic, and after passing a coil spring through the boss, pressing the pressure plate toward the back cover so that the boss is inserted into the long hole of the pressure plate, By sliding the pressure plate in the longitudinal direction of the elongated hole in this pressed state, the first and second engaging portions are engaged with each other, so that the pressure plate cannot be detached from the back cover and has elasticity due to the coil spring. The mounting structure of the pressure plate is characterized by being attached to the camera back as shown in the figure.