JP2785645B2 - Zero-type integrator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a zero-return type integrator for returning the display of a numeral wheel to zero by pressing an operation knob.

[0002]

2. Description of the Related Art Conventionally, an operation knob for zero-return operation used in a zero-reduction type integrator for integrating and displaying a traveling distance and the like has conventionally been provided by temporarily fixing a coil spring to a base of the operation knob when assembling the frame. Insert the tip of the original part of the operation knob into the insertion hole drilled at an angle, insert it into the upper bearing while returning it vertically, and then rotate the operation knob around its axis. Then, the assembly is performed such that the return lever at the tip of the return shaft is engaged with the engagement recess at the intermediate portion of the operation knob.

[0003]

As described above, the coil spring is temporarily fixed to the base of the operation knob, the operation knob is fitted while being inclined, and the operation knob is rotated around its axis to engage. There has been a problem that the assembling work is complicated, for example, it is necessary to continuously perform a plurality of different assembling operations such as engaging a return-to-zero lever with the concave portion.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and is a zero-integrator capable of easily assembling an operation knob by a simple assembling operation simply by pushing an operation knob in one direction. The purpose is to provide.

[0005]

In order to achieve the above object, a zero-return type integrator according to the present invention has an engaging projection at one end via a crank portion, and the number wheel is returned to zero by rotation. A zero-return shaft, a guide cylinder provided on the extension of the frame and having a central wall inside, and a lower part of the base provided with a knob part on the upper side, which can be inserted into the guide cylinder and slit in the central longitudinal direction. An operation knob provided with a rod-shaped guide portion having an elastic engagement portion that engages with an engagement convex portion of a return-to-zero shaft on a side portion of a base portion, and an operation knob that is externally fitted on an outer periphery of a guide cylinder, A coil spring for urging in a return direction, wherein the elastic engaging portion of the operation knob is formed in a rectangular frame shape with an open center, and has an inclined surface at a lower end of elastic deforming portions provided on both sides. Is provided.

[0006]

[Operation / Effect] In the zero-reducing integrator configured as described above, when assembling the operation knob, the coil spring is fitted on the outer periphery of the guide cylinder, and the guide portion of the operation knob is inserted into the guide cylinder on the frame side. Then, the elastic engaging portions on the side portions are aligned with the engaging convex portions of the zero-reset shaft, and are pushed in. At this time, the inclined frame portion of the elastic engaging portion first contacts its inclined surface to the tip of the engaging convex portion, moves inward by the deformation of the elastic deforming portion, and climbs over the engaging convex portion. At this time, the elastic engaging portion returns to the original posture,
The engaging protrusion enters the inside of the rectangular frame-shaped elastic engaging portion, and the inclined frame supports the engaging protrusion, thus completing the assembly. In this state, the operation knob is prevented from coming off by the inclined frame portion, and its rotation is prevented by engagement of the central wall in the guide cylinder with the slit of the guide portion.

As described above, the operation knob can be easily assembled by a simple assembling operation simply by pushing the operation knob in one direction.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a front view of a zero-reduction integrator, and FIG.
Shows a bottom view thereof. First, the schematic structure of a zero-return integrator will be described. A plurality of numeral rings 6 are arranged and supported on a frame 1 in parallel, and each numeral wheel 6 is provided with a gear. It is rotatably supported by and meshes with the pinion. The return-to-zero shaft 4 is supported on the frame 1 so as to be rotatable within a certain angle range along the side and axial direction of the numeral wheel 6. Further, the return-to-zero shaft 4 is provided with a lever-like return-to-zero member 7, and each return-to-zero member 7 is provided with a numeral wheel 6 when the return-to-zero shaft 4 is rotated to disengage the pinion from the gear. Is pressed and rotated so that the display position of each numeral wheel 6 becomes zero.

One end of the return-to-zero shaft 4 protrudes from a side of the frame 1, and a columnar engaging projection 4a is provided on the side thereof via a crank 4b. On the other hand, below the engagement projection 4a, a guide cylinder 2 for supporting the operation knob 3 for returning to zero is provided on the extension of the frame 1. As shown in FIGS. 4 and 8, a central wall 2 a is provided inside the guide cylinder 2, and a vertical concave portion 2 b for receiving a convex portion on the operation knob 3 side described later is provided on a side wall surface facing the central wall. It is formed. A coil spring 5 for urging an operation knob described later in a return direction is fitted around the outer periphery of the guide cylinder 2.

As shown in FIGS. 5 to 7, the operation knob 3 for returning to zero has a plate-shaped knob portion 3b protruding from a base portion 3a.
A guide portion 3c is provided below the base portion 3a, and an elastic engagement portion 3e is provided on a side portion of the base portion 3a.

The guide portion 3c is formed by providing a slit in the longitudinal direction of the center of the cylinder, has a slidable shape inserted into the guide tube 2, and is inserted into the guide tube 2 when inserted into the guide tube 2. The wall 2a is inserted into the slit and prevents the operation knob 3 from rotating. In addition, a low rib-shaped convex portion 3d inserted into the vertical concave portion 2b in the guide cylinder 2 is protruded from an outer peripheral portion of the guide portion 3c. When the operation knob 3 is pushed in, the convex portion 3d hits the lower portion of the inner peripheral surface of the guide cylinder 2 to give a sense of moderation.

The elastic engaging portion 3 provided on the side of the base 3a
e is formed in a rectangular frame shape with an opening at the center in a side view as shown in FIG. 6, and has an elastically deforming portion 3f on both sides vertically, and the lower ends of both elastically deforming portions 3f have inclined surfaces with inclined surfaces. A frame 3g is formed to connect both ends. The inclined frame portion 3g is formed with rigidity, and as described later, when engaging with the engaging convex portion 4a of the return-to-zero shaft 4, it goes over the tip of the engaging convex portion 4a and enters the lower side thereof. , And supports the engaging projection 4a. Further, a bifurcated guide frame 3h is provided beside the elastic engagement portion 3e.
Are provided so as to guide the engaging projections 4a from both sides during assembly engagement.

The operation knob 3 having such a structure is, for example,
It is integrally molded from a synthetic resin and assembled on the side of the zero-integrator as follows.

When assembling the operation knob 3, first, the coil spring 5 is fitted on the outer periphery of the guide tube 2, and the guide portion 3c of the operation knob 3 is inserted into the guide tube 2 on the frame side.
The elastic engaging portion 3e on the side is aligned with the engaging convex portion 4a of the return-to-zero shaft 4 and pushed.

The guide frame 3 on the side of the elastic engaging portion 3e
h positions the engagement convex portion 4a at the center thereof when pushing the operation knob 3, and guides it.

At this time, the inclined frame portion 3g of the elastic engagement portion 3e
First, the inclined surface is brought into contact with the tip of the engaging convex portion 4a, and moves inward by the deformation of the elastic deformation portion 3f to pass over the engaging convex portion 4a.

Thus, the elastic engaging portion 3e returns to the original position, the engaging convex portion 4a enters the inside of the rectangular frame-shaped elastic engaging portion 3e, and the inclined frame portion 3g supports the engaging convex portion 4a. And the assembly is completed.

In this state, the operation knob 3 is prevented from coming off by the inclined frame portion 3g of the elastic engaging portion 3e, and its rotation is prevented by the engagement between the central wall 2a in the guide cylinder 2 and the slit of the guide portion 3c. Is blocked by

As described above, the operation knob can be easily assembled by a simple assembling operation simply by pushing the operation knob in one direction.

When returning the integrator to zero, the knob 3f of the operation knob 3 is pressed. At this time, the operation knob 3 slides the guide portion 3c in the guide tube 2, compresses the coil spring 5, and moves down, whereby the engaging protrusion 4a moves down via the elastic engaging portion 3e. , The return-to-zero shaft 4 rotates through the crank portion, and the display of the numeral wheel 6 is returned to zero.

[Brief description of the drawings]

FIG. 1 is a front view of a zero-type integrator showing an embodiment of the present invention.

FIG. 2 is a bottom view of the integrator.

FIG. 3 is an enlarged partial sectional view of an operation knob assembly portion.

FIG. 4 is an enlarged partial sectional view from the left side.

FIG. 5 is a front view of an operation knob.

FIG. 6 is a right side view of the same.

FIG. 7 is a plan view of the same.

FIG. 8 is a plan view of a guide cylinder.

FIG. 9 is a front view when the operation knob is assembled.

FIG. 10 is a front view when the operation knob is pressed.

[Explanation of symbols]

1-frame, 2-guide cylinder, 3-operation knob, 3a-base, 3b-knob, 3c-guide, 3e-elastic engagement, 3f-elastic deformation, 3g-inclined frame, 4-return Zero shaft, 4a-engaging projection, 4b-crank, 5-coil spring.

Claims (1)

(57) [Claims] 1. A return-zero shaft having an engagement protrusion at one end via a crank portion and returning a numeral wheel by rotation, and a guide provided on an extension of the frame and having a central wall therein. A cylinder and a rod-shaped guide portion having a slit in the central longitudinal direction, which can be inserted into the guide cylinder, are provided below the base provided with the knob portion on the upper portion, and the return shaft is provided on a side portion of the base. An operation knob provided with an elastic engagement portion that engages with the engagement convex portion; and a coil spring that is fitted around the outer periphery of the guide cylinder and urges the operation knob in a return direction. The elastic engaging portion is formed in a rectangular frame shape with an opening at the center, and an inclined frame portion having an inclined surface is provided at a lower end of the elastically deforming portion provided on both sides. Integrator.