CN2435725Y

CN2435725Y - Fixing device for instruments and meters

Info

Publication number: CN2435725Y
Application number: CN 00243105
Authority: CN
Inventors: 王鲁西
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-07-17
Filing date: 2000-07-17
Publication date: 2001-06-20
Anticipated expiration: 2010-07-17

Abstract

The utility model belongs to the instrument field, which aims to provide a fixing device with easy operation, low cost and reliable installation for instruments. The utility model is characterized in that a snap ring made of plastic materials is matched with the case of the instrument, and a backstop tooth on the fastening snap ring and a backstop groove on the case of the instrument are used for completing the installation of various instruments.

Description

The stationary installation that a kind of instrument is used

At present: when the instrument of selling on the market use to be installed, its mounting structure is substantially: inlay or the double-screw bolt of two metals of injection moulding or plastic material at the rear end face of instrument housing, double-screw bolt cooperates with a U type metal fixed head, the both ends of the surface of U type fixed head withstand on the rear surface of instrument panel, use nut fastening again, thereby finish the fixed installation of instrument.

Above-mentioned fixing device for installing weak point is: complex process, cost height, that reliability inconvenient and that install is installed is low, because some instrument service condition in dynamically work down, easily causes the loosening of nut and takes off dew.

The purpose of this utility model provides a stationary installation that cost is low, manufacturing process simple, use with convenient and the high instrument of reliability when installing.

The technical solution of the utility model is: fastening snap ring, material are plastics.It comprises symmetrical plane and the formed snap ring of symmetrical arc surface.T shape member and inclined-plane locking tooth, inclined-plane locking tooth are positioned on the snap ring inside surface relative position.T shape member is on the collar outer surface position identical with the inclined-plane locking tooth, and the effect of T shape member is that instrument panel and instrument are adjacent to and dismantle.Instrument housing, material are plastics.The back stop slot group that its outside surface is made up of several inclined-plane back stop slots on relative position, utilize the fastening snap ring of appeal and the structure of instrument housing and the characteristic of plastic material, when mounted, fastening snap ring is axially pushed along the instrument rear end face, when T shape member was adjacent to instrument panel and instrument, the locking tooth of fastening snap ring just snapped in the back stop slot.On the contrary, when dismantling instrument if desired, only need move direction opposite spur of tail end to the time of the T shape member of fastening snap ring, the instrument of just can dismantling with installation.

Owing to adopted such scheme, the installation process that instrument is installed is simple and reliable, simple in structure, cost is low.

The utility model is described in further detail below in conjunction with drawings and Examples.

Fig. 1 is the instrument scheme of installation.

Fig. 2 is fastening snap ring front view.

Fig. 3 is that the A of Fig. 2 is to view.

Fig. 4 is the B-B cut-open view of Fig. 3.

Fig. 5 is the partial enlarged drawing of Fig. 4.

Fig. 6 is an instrument watchcase front view.

Fig. 7 is the C-C cut-open view of Fig. 6.

Fig. 8 is the partial enlarged drawing of Fig. 7.

Fig. 9 is second fastening snap ring synoptic diagram of embodiment.

Figure 10 is second embodiment instrument watchcase synoptic diagram.

Figure 11 is that the D of Figure 10 is to view

Among the figure: 1, instrument watchcase, 2, fastening snap ring, 3, instrument panel,

1a, back stop slot, 2a, snap ring, 2b, T shape member, 2c locking tooth, 2d, convex surface

Embodiment 1

In Fig. 1, instrument watchcase 1 is front-installed from instrument panel 3, and fastening snap ring 2 axially is inserted in along instrument watchcase 1 from the instrument panel back, until the horizontal end of T shape member 2b instrument watchcase 1 and instrument panel 3 is adjacent to, this moment, locking tooth 2c just was entrapped among the back stop slot 1a, thereby finished the installation of instrument.Only need lift T shape member 2b tail end during dismounting and spur the instrument of to dismantle to direction is opposite when installing.

In Fig. 2, the horizontal end of T shape member 2b is in the shape of the letter V, and its angle is that 170 °～172 ° purposes are the elastic force that utilizes the distortion back to produce, and instrument is installed reach fastening effect.

Other dimension reference Fig. 2 of T shape member 2b, Fig. 3, Fig. 4, design gets final product in proportion.

Shown in Figure 3 is the snap ring 2a planform of fastening snap ring 2 and relative position and the basic configuration of T shape member 2b and locking tooth 2c.Fastening snap ring 2 inner ring diameters are respectively φ 1 and φ 2, φ 1 arc surface is the distortion arc surface, φ 2 arc surfaces are the fit circular arc face, size relationship is φ 1＞φ 2 0.5～0.9mm, the central angle of the arc surface shown in the φ 2 is 30 °～40 °, on the position convex surface 2d is arranged in the middle of it, is of a size of wide 5～6mm, thickness 0.5～0.9mm, the effect of convex surface 2d is more effectively to hold instrument watchcase 1 tightly.The wall thickness of φ 1 arc surface is 4～5mm, the wall thickness of φ 2 arc surfaces is 2～3mm, between two strings at diameter phi 2 sizes and locking tooth 2c place apart from being the fit dimension relation apart from size between the outside dimension of size and instrument watchcase and back stop slot 1a two planes, as: instrument watchcase 1 external diameter is between φ 59.74～φ 59.86mm, and the φ 2 of then fastening snap ring 2 is 60.8mm.Distance is of a size of 572mm between the back stop slot 1a plane, and then the distance between two strings at locking tooth 2c place is 57.5mm.

Fig. 4, shown in Figure 5 be the planform of locking tooth 2c, its dimensional parameters angle [alpha] is that 60 ° of transverse tooth thickness are 0.7mm, the facewidth is 8mm with reference to view 3G.

Fig. 6, Fig. 7, shown in Figure 8 be the structure of instrument watchcase 1 and back stop slot 1a.The dimensional parameters of back stop slot 1a is: angle [alpha] 1 is 30 °, and angle [alpha] 2 is 65 °, and H is 0.55mm, and L is 1mm, and G is 82mm.Fig. 6, Fig. 7 show: in 1 two opposite planar of instrument watchcase several back stop slots 1a is arranged, the number of back stop slot 1a should be determined in conjunction with the design of fastening snap ring 2 when design, the back stop slot group that back stop slot 1a forms, guarantee that fastening snap ring 2 when instrument and instrument panel are adjacent to, end leg tooth 2c and is entrapped in the back stop slot 1a.

In the foregoing description, each parameter size of being given is meant a specific instrument watchcase and fastening snap ring.In actual applications, should be according to the physical size and the deformation characteristic that takes into full account plastic material of instrument watchcase, reference example is come each dimensional parameters of the fastening snap ring of specific design and the dimensional parameters of back stop slot.

Embodiment 2

In Fig. 9, Figure 10, Figure 11, represented the instrument watchcase and the fastening snap ring of another kind of shape and structure respectively.With the difference of embodiment 1 be the variation of the shape of instrument watchcase, thereby the planform of fastening snap ring changes to some extent, but their matching relationships each other are substantially the same manner as Example 1.

More than two embodiment show that the utility model is with a wide range of applications in the instrument field.The design concept novel according to this use can adopt this fastener to different instrument.

Claims

1. the instrument stationary installation in the instrument field, it is made up of fastening collar and instrument watchcase, it is characterized in that described fastening snap ring is a plastic injection piece, and it comprises collar, T shape member and the locking tooth that the arc surface by the plane of symmetry and symmetry forms; T shape member is positioned on the collar symmetric position, and locking tooth is positioned on the collar inner ring symmetric position, and is positioned at the back stop slot group of being made up of several back stop slots on the instrument watchcase symmetrical plane.

2. stationary installation according to claim 1 is characterized in that T shape member and locking tooth are positioned on collar outside surface and the inside surface same position.

3. according to the above stationary installation of claim, the arc surface that it is characterized in that symmetry is that two internal diameters are respectively two arc surfaces compositions of [φ 1] and [φ 2].

4. stationary installation according to claim 1 is characterized in that a convex surface is arranged in the middle of the circular arc inside surface shown in [φ 2].