JP2563990B2 - 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 separated from the boss member with one hand by simply moving the member in the axial direction, and the shaft can be connected to the boss member simply by 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. 3 to 7, 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 12 of the set ring 12b, which is a ring-shaped member, prevents the ball 8 from jumping outward in the radial direction.
On the other hand, the set ring 12 is held at the position shown in FIG. 3 by the loop-shaped substantially triangular spring ring 24 housed in the groove 14 of the set ring 12. That is, the spring ring 24 has its three corners 51 set 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 disengage the shaft 6 from the boss member 2, the set ring 12 is moved to the left as viewed in FIG. 3 against the force of the spring ring 24 to reach the position of the set ring 12 in FIG. However, FIG. 6 shows a 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. 6 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, to insert the shaft 6 into the boss member 2 next time, simply insert the shaft 6
Just insert. 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 is flat on the spring ring 24.
Since the spring 50 is removed from the recess 19a (see FIG. 7), the spring ring 24 slides down along the inclined plane 28 due to the force of contraction, thereby moving the set ring 12 to the position of the set ring in FIG. 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 includes a boss member, a shaft that can be fitted in a hole of the boss member, and a periphery of the shaft that is housed in the opening of the boss member. A coupling member that engages with the groove of the shaft to prevent the shaft from slipping out of the boss; a first position that holds the coupling member in the groove around the shaft; and the coupling member separates from the groove around the shaft. A sliding member that can move between the sliding member and a first position that is constrained by the sliding member and contracts along an inclined surface around the boss member. A coupling device comprising a loop-shaped spring that is moved to either a position or a second position, wherein the inclined surface of the boss member is formed as a single truncated conical surface, and the pin engages with the loop-shaped spring. Is provided on the sliding member, and the sliding member and the boss portion are provided. It is characterized in that at least one guide pin and a guide hole, which are slidably fitted to the material, are provided.

(Operation) Instead of forming a taper surface and multiple points on the circumference, a frusto-conical surface is used, which makes processing 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.

Further, the rotation of the spring ring can be surely prevented by the pin provided on the set ring. Further, the guide pin and the guide hole can guide the set ring in the axial direction with respect to the boss member and surely prevent the set ring from rotating.

(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. This frusto-conical surface 61 causes an inclined plane
It can act instead of 28.

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, a small hole 62 is formed in the set ring 12 to form a pin 63.
To prevent the spring ring 24 from rotating at a portion near the corner 51 of the spring ring 24. Further set ring
At least 1 on set ring 12 to prevent rotation of 12
Individual small holes 64 are formed and guide pins 65 are implanted. On the other hand, a guide hole 66 for accommodating the guide pin 65 is formed by sliding the set ring, and the set pin is formed by the guide pin 65 and the guide hole 66.
12 guides are formed and the set ring 12 is prevented from rotating. In this embodiment, two guide pins 65 and two guide holes 66 are provided to face each other in diameter.

(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.

In addition, the pin provided on the set ring prevents the spring ring from rotating, and the guide pin provided on the set ring and the guide hole provided on the boss member guide the set ring to the boss member and ensure the rotation of the set ring. Could be prevented.

[Brief description of drawings]

FIG. 1 is a partial sectional view of a boss member of the coupling device of the present invention, FIG. 2 is a front view with a part of a slide collar of the coupling device of FIG. 1 being a cross section, and FIG. 3 is a coupling of a conventional coupling device. 4 is a sectional view taken along the line IV-IV of FIG. 3, FIG. 5 shows the spring of FIG. 3, and FIGS. 6 and 7 show the shaft inserted into the boss member. It is sectional drawing which shows the state in the middle. 2 …… Boss member, 4 …… Hole 6 …… Shaft, 7 …… Opening 8 …… Coupling member, ball, 10 …… Set groove 12 …… Sliding member, Set ring 12b …… Leg part, 14 …… Groove 18 …… Stopper, 19a …… Concave 24 …… Spring ring, 28 …… Inclined plane 40 …… Concave, 50 …… Flat part 51 …… Corner, 61 …… Frusto-conical surface 62 …… Small Hole, 63 ... pin 64 ... small hole, 65 ... guide pin 66 ... guide hole

Claims (1)

(57) [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 is constrained by the sliding member and contracts along an inclined surface around the boss member to move the sliding member to either the first position or the second position. In the coupling device, the inclined surface of the boss member is formed as a single truncated conical surface, and a pin that engages with the loop-shaped spring is provided on the sliding member. At least one that is slidably fitted to each member
A coupling device, characterized in that a guide pin and a guide hole for each unit are provided.