JPS5914721Y2 - Dial gauge outer frame mounting device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a device for rotatably attaching the outer frame of a dial gauge to the inner frame.

In conventional dial gauges, a cylindrical outer frame is rotatably attached to a cylindrical inner frame layer via a linear spring or plate, and the outer frame and inner frame are connected via a linear spring or plate. Normally, a small frictional force is created between the two.

However, with this dial gauge, when attaching or detaching the outer frame, it is necessary to remove the back cover of the inner frame and attach or detach the spring between the inner frame and the outer frame from the inside. It wasn't easy to put on and take off.

The present invention provides an outer frame mounting device for a dial gauge that allows the outer frame to be easily attached to and removed from the inner frame. It is characterized by fitting into a retaining groove formed on the outer circumferential surface of the inner frame.

An embodiment of the present invention will be described below based on the drawings.

In FIG. 1, 1 is a cylindrical aluminum alloy inner frame, and 2 is a holding groove formed on the outer peripheral surface of the inner frame 1.

As shown, the holding groove 2 extends in the circumferential direction of the outer peripheral surface of the inner frame 1 and has an annular shape.

3 is a dial plate fixed to the inner frame 1, 4 is a pinion shaft integrated with a center pinion (not shown) rotatably mounted inside the inner frame 1, and 5 is a pointer fixed to the tip of the pinion shaft 4. be.

Reference numeral 6 denotes a cylindrical outer frame made of an elastic material such as soft synthetic resin or rubber, and a plurality of engaging pawls 7 (FIG. 2) are provided protruding from the inner peripheral surface of one end thereof.

The engaging claws 7 are arranged at predetermined intervals in the circumferential direction of the outer frame 6.
Each engaging pawl 7 has an outer frame 6.
a guide surface 7a that slopes inward from the outer end 6a of the
and a locking surface 7b provided perpendicularly toward the outer circumferential surface of the outer frame 1 from the tip of the guide surface 7a.

In the figure, the engaging claw 7 is fitted into the holding groove 2.

A cover mounting groove 8 extending in the circumferential direction is formed on the inner peripheral surface of the other end of the outer frame 6.

At the bottom of the cover mounting groove 8, there is a liquid-tight groove 9 in which side walls 9a are inclined in a direction that gradually widens toward the open end.
is formed.

The peripheral edge of a protective cover 10 made of transparent plastic, glass, etc. is fitted into the cover mounting groove 8, and the liquid-tight retaining groove 9 is fitted with a peripheral edge of a protective cover 10 made of transparent plastic or glass. A protruding flange 11 is fitted.

The flanges 11 are connected to the side walls 9a, 9a of the liquid-tight groove 9.
The outer frame 6 and the protective cover 10 are in pressure contact with each other to maintain liquid tightness between the outer frame 6 and the protective cover 10.

Reference numeral 6a denotes a cover mounting guide surface formed on the inner circumferential surface of the outer frame 6 so that its diameter gradually increases from the opening of the cover mounting groove 8 toward the end surface of the outer frame 6.

Reference numeral 12 denotes a stepped portion formed on the inner circumferential surface of the central portion of the outer frame 6, and is provided parallel to the locking surface 7b of the engaging claw 7.
A flange portion 13 provided at one end of the inner frame 1 is held between the locking surface 7b and the locking surface 7b without any play.

The flange portion 13 of the inner frame 1 is formed at one end of the inner frame 1 by forming the holding groove 2 therein.

A thin flange 14 is provided on the inner circumferential surface of the outer frame 6 between the stepped portion 8 and the engaging claw 7 in a protruding manner.

The flange 14 is pressed against the outer circumferential surface of the flange portion 13 to maintain liquid tightness between the outer circumferential surface of the flange portion 13 and the outer frame 6.

In the figure, 15 is a scale plate fixed to the inner peripheral surface of the outer frame 6, and is adjacent to the dial plate 3.

The operation of attaching and detaching the outer frame 6 of the dial gauge having such a configuration will be explained.

When attaching the outer frame 6 to the outer periphery of the inner frame 1, the guide surface 7a of the engaging claw 7 is brought into contact with the end periphery of the inner frame 1, and the outer frame 6
Press against inner frame 1.

As a result, the engaging claw 7 slides on the outer circumferential surface of the flange portion 13 and fits into the holding groove 2 of the inner frame 1.

In this state, the flange portion 13 is held between the engaging claw 7 and the stepped portion 12 without any play.

Further, the flange 14 of the outer frame 6 is connected to the flange portion 13 of the inner frame 1.
Since it is pressed against the outer surface to maintain liquid tightness, water and the like will not enter between the inner frame 1 and the outer frame 6 toward the pointer 5 side.

By setting the pressure force between the flange 14 and the flange portion 13 to be small, the outer frame 6 can be fixed to the inner frame 1, and the outer frame 6 can be fixed to the inner frame 1 with a small force.
This allows it to be rotated relative to the

Next, when removing the outer frame 6 from the inner frame 1, insert a screwdriver or the like between the inner frame 1 and the outer frame 6, and insert the engaging claws 7 of the outer frame 6.
After removing the engaging claws 7 from the holding grooves 2 of the inner frame 2 by lifting the vicinity, the inner frame 1 is pulled from the outer frame 6.

Thereby, the outer frame 6 can be removed from the inner frame 1.

When the outer frame 6 is attached to or removed from the inner frame 1 in this manner, the ends of the outer frame 6 can easily expand because the outer frame 6 is made of an elastic material. .

Furthermore, when attaching the protective cover 10 to the outer frame 6, the protective cover 10 is pressed against the cover attachment guide surface 6a.

As a result, the protective cover 10 slides on the cover attachment guide surface 6a while expanding the outer frame 6, and its peripheral edge fits into the cover attachment groove 8, and the protective cover 10
The flange 11 of No. 0 fits into the liquid-tight retaining groove 9.

As a result, the flange 11 is pressed against the side wall 9a of the liquid-tight groove 9, and water or the like is prevented from entering between the outer frame 6 and the protective cover 10.

When removing the protective cover 10 from the outer frame 6, insert a screwdriver between the outer frame 6 and the protective cover 10 and lift the flange 11 of the protective cover 10 from the cover mounting groove 8.

Thereby, the protective cover 10 can be easily removed from the outer frame 6.

As explained above, in the present invention, an engaging pawl is formed on the inner circumferential surface of the outer frame made of an elastic material, and this engaging pawl is fitted into a retaining groove formed on the outer circumferential surface of the inner frame. The structure is simpler than the conventional structure in which the back cover attached to the inner frame is removed and separately provided parts are attached and detached.

Moreover, with this, when attaching or removing the outer frame to or from the inner frame, there is no need to remove the back cover, spring, etc., as in the case of conventional methods. Since it is only necessary to pull it out, there is an advantage that the work of attaching and detaching the outer frame to and from the inner frame is extremely simple and easy.

In addition, when the outer frame is made of plastic, in addition to the above-mentioned effect, the inner frame and the outer frame can be smoothly rotated relative to each other.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of an outer frame mounting device showing an embodiment of the present invention, and FIG. 2 is a left side view of the outer frame shown in FIG. 1. 1... Inner frame, 2... Holding groove, 6... Outer frame, 7...
・Engagement claw.

Claims (1)

[Claims for Utility Model Registration] A dial gauge in which a cylindrical outer frame is rotatably fitted onto the outer periphery of a cylindrical inner frame, including an annular retaining groove extending in the circumferential direction on the outer periphery of the inner frame. and a flange portion, and the outer frame is made of an elastic material, and an inclined guide for guiding the inner frame is provided on the inner peripheral surface of the outer frame at a predetermined interval in the circumferential direction. a plurality of locking pawls each having a locking surface and a locking surface to the side surface of the holding groove; a flange that can be secured to the flange portion of the inner frame; and a surface facing the locking surface while sandwiching the flange portion; The outer frame is fitted to the inner frame by providing a stepped portion and a cover mounting groove, and guiding the inner frame along the guide surface and pushing it into the outer frame until the locking claw engages with the holding groove. A dial gauge outer frame mounting device characterized by: