JPH0619180B2 - Coupling device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention comprises a boss member and a shaft fitted in a hole of the boss member, and a ring-shaped member is used to separate the connected shaft from the boss member. The shaft can be detached from the boss member by one hand only by moving the member in the axial direction, and the shaft can be connected to the boss member by simply inserting the shaft into the hole of the boss member. This refers to a flexible coupling device.

(Prior Art and its Problem) Conventionally, as this type of coupling device, there is one disclosed in JP-A-62-228716. As shown in FIGS. 4 to 8, this connecting device allows the shaft 6 to be inserted into the hole 4 of the boss member 2 and the ball 8 as a connecting member housed in the opening 7 of the boss member 2 to be inserted into the shaft 6. The boss member 2 and the shaft 6 are connected when they are in the setting groove 10. At this time, the leg portion 12b of the set ring 12 as a sliding member, which is a ring-shaped member, prevents the ball 8 from protruding outward in the radial direction.
On the other hand, the set ring 12 is held in the position shown in FIG. 4 by a loop-shaped substantially triangular spring ring 24 housed in the groove 14 of the set ring 12. Immediately, the spring ring 24 sets the three corners 51 to the ring 12.
While being constrained in the groove 14 of the boss member 2, there are three flat portions 50 respectively on the three inclined planes 28 of the boss member 2. Therefore, the flat portion 50 of the spring ring 24 tries to slide down along the inclined surface 18, but is in contact with the stopper 18 of the boss member, so that the set ring 12 is held at the position shown in FIG.

Next, in order to separate the shaft 6 from the boss member 2, a set ring
4 is moved to the left as viewed in FIG. 4 against the force of the spring ring 24 to reach the position of the set ring 12 in FIG. However, FIG. 7 shows the position where the shaft is to be inserted, and the position of the shaft 6 is the position shown in FIG. When the position shown in FIG. 7 is reached, the ball 8 is in the recess 40 of the set ring 12.
The shaft 6 can be disengaged from the boss member 2 by pulling the shaft 6 to the right as viewed in FIG. Further, the flat portion 50 of the spring ring 24 enters the recess 19a intersecting the opening 7 and holds the set ring 12 in this position.

Therefore, when inserting the shaft 6 into the boss member 2 next time, it is only necessary to insert the shaft 6. That is, the chamfered portion at the tip of the shaft 6 presses the ball 8 outward in the radial direction. The ball 8 is pushed out of the opening 7, and the flat portion 50 of the spring ring 24 is pressed.
As the spring ring 24 slides down along the inclined plane 28 due to the force of contraction, the set ring 12 is moved to the position of the set ring in FIG. 4 because it is removed from the recess 19a (see FIG. 8). This coupling device is easy to operate and is very effective as this type of coupling device.

However, since the three inclined surfaces 28 of the boss member 2 are processed with a milling cutter, skill is required for the processing and the number of steps is increased. Moreover, the inclination angle of the inclined surface 28 needs to have a certain corresponding angle in relation to the spring ring, and therefore, the accuracy of the inclined surface is required to be high. This increases the cost of the coupling device.

Further, if the relative machining accuracy between the spring ring 24 and the inclined surface 28 is poor, the connection between the boss member and the shaft is adversely affected.

(Means for Solving the Problem) In order to solve this problem, the coupling device of the present invention comprises a boss member,
A shaft that can be fitted in the hole of the boss member, a coupling member that is housed in the opening of the boss member and that engages with the peripheral groove at this time to prevent the shaft from coming out of the boss, and the coupling member. A sliding member movable between a first position for holding the shaft in a groove around the shaft and a second position for allowing the coupling member to move away from the groove around the shaft; A coupling device including a loop-shaped spring that moves the sliding member to one of the first position and the second position by a force that is constrained by the boss member and contracts along an inclined surface around the boss member. The inclined surface of the boss member is formed as a uniform frustoconical surface that is continuous in the circumferential direction, a protrusion is provided on the loop-shaped spring, and the protrusion is fitted in a groove extending in the axial direction formed on the boss member. It is characterized by that.

(Operation) Instead of forming multiple tapered surfaces on the circumference, a frusto-conical surface has been adopted, which makes machining very easy. Further, the relative machining accuracy between the spring ring and the truncated conical surface does not adversely affect the coupling between the boss member and the shaft.

The fitting of the groove and the protrusion can reliably prevent the rotation of the spring.

(Example) In the present invention, a truncated cone surface 61 is conventionally formed instead of the three inclined flat surfaces 28 of the boss member 2 on which the flat portion 50 of the spring ring 24 moves. This processing is easy because it can be performed by normal taper processing. The frusto-conical surface 61 allows the inclined plane 28
An alternative action can be performed.

However, unlike the case of the inclined flat surface 28, the spring ring 24 can rotate about the axis, and therefore it is necessary to prevent the rotation of the spring ring 24.

In the present invention, the axial groove 62 is formed in the boss member 2, while the protrusion 63 is formed in the spring ring 24. The fitting of the protrusion 63 into the groove 62 prevents the spring ring 24 from rotating. Although the projection 63 is brazed to the spring ring 24 in this embodiment, other means may be used. FIG. 3 shows two types of embodiments of the protrusion 63.

(Effects) In the present invention, the frusto-conical surface is used instead of forming the tapered surface at a plurality of positions on the circumference, so that the processing is very simple and the coupling device can be manufactured at low cost. Further, since the fitting of the groove and the projection is adopted as the rotation stop, the rotation of the spring ring can be surely prevented.

[Brief description of drawings]

1 is a partial sectional view of a boss member of the coupling device of the present invention, FIG. 2 is a side view of the boss member of FIG. 1, and FIGS. 3 (a) and 3 (b) are spring rings of the coupling device of the present invention. Front view and side view, (c) and (d) are front views and side views of other examples of spring rings, FIG. 4 is a cross-sectional view showing a state in which a conventional coupling device is coupled, and FIG. FIG. 6 is a cross-sectional view taken along the line VV of FIG. 6, FIG. 6 shows the spring ring of FIG. 4, and FIGS. 7 and 8 are cross-sectional views showing a state in the middle of inserting the shaft into the boss member. 2 …… Boss member, 4 …… Hole 6 …… Axis, 7 …… Opening 8 …… Coupling member, ball, 10 …… Set groove 12 …… Sliding member, Set ring 12b …… Leg part, 14 …… Groove 18 …… Stopper, 19a …… Recess 24 …… Spring ring, 28 …… Inclined flat surface 40 …… Recess, 50 …… Flat part 51 …… Corner part, 61 …… Conical conical surface 62 …… Groove , 63 …… Protrusion

Claims (1)

[Claims] 1. A boss member, a shaft which can be fitted in a hole of the boss member, and a shaft which is housed in an opening of the boss member and is engaged with a groove around the shaft, so that the shaft is prevented from coming out of the boss. Moveable between a blocking coupling member, a first position that retains the coupling member in a groove around the shaft, and a second position that allows the coupling member to move away from the groove around the shaft. A sliding member, and a loop-shaped spring that moves the sliding member to either the first position or the second position by a force that is constrained by the sliding member and contracts along an inclined surface around the boss member. In the coupling device including, the inclined surface of the boss member (2) is formed as a uniform frusto-conical surface (61) continuous in the circumferential direction, and a protrusion (63) is formed on the loop-shaped spring (24). The projection (63) is fitted into the groove (62) formed in the boss member (2) and extending in the axial direction. Coupling device for the butterflies.