JPS5824666B2 - Lock mechanism in propulsion device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a locking mechanism in a propulsive force applying device.

In general, a propulsion force applying device is a device that constantly applies a propulsive force in a fixed direction and exhibits characteristics similar to a rigid body when an external force in the opposite direction is applied.

The above-mentioned propulsion force applying device, such as a chain tensioner or a belt tensioner, is used for the purpose of continuously pressing a chain or belt with a propulsion force in a fixed direction to constantly maintain the chain or belt in an appropriate tension state.

In other words, a tensioner applies a certain tension to the chain or belt by pressing it in a certain direction when the chain or belt becomes loose due to stretching or wear during use. It is desirable that the material has properties close to that of a rigid body in response to an external force in the opposite direction.

However, a propulsion force imparting device that meets the above requirements requires maintenance such as readjustment depending on the elongation of the chain, etc. In this case, in conventional propulsion force imparting devices, due to its structure, it must be removed from the mounting body or Or you can attach it to the main body.
When attempting to dispose of the device, the mainspring could not be tightened unless the casing lid, which forms the outer shell of the device, was removed.

In addition, when adding or removing the device from the main body, the piston with the propulsive force cannot be freely pulled back into the device, so a reaction force always acts when loosening the mounting bolts to the main body. The removal work was extremely troublesome.

The present invention has been made in view of the above-mentioned circumstances, and provides a propulsive force applying device that converts rotational force due to the spring torque of the shaft into propulsive force in the axial direction of the piston, in which a split groove is formed at the end of the shaft. , a through hole having an appropriate size and shape is bored in a portion of the casing lid forming the outer shell of the device corresponding to the axis of the shaft, and the through hole is removably connected to the split groove and the through hole. The rotation of the shaft is locked or unlocked by a matching stopper member, and further the shaft is rotated through the through hole of the casing lid without adding or removing the casing lid using an appropriate jig. It is therefore an object of the present invention to provide a locking mechanism for a novel propulsion force applying device that can extremely easily tighten the spring and pull the piston back into the device.

Such a conventional propulsion force applying device has a structure as shown in FIGS. 1 and 2, for example.

Reference numeral 1 denotes a propulsion force applying device, and a shaft 4 is installed in a bearing 3 in a casing 2 so as to be rotatable while restraining sliding in the axial direction.

The shaft 4 consists of a head 5 having a U-shaped cross section and legs 6 extending outward from the bottom of the head 5, and a female threaded portion 5a is carved on the inner peripheral surface of the head 5 near the opening. A mainspring spring 7 is attached to the leg portion 6 with its inner end fixedly fixed.

The outer end of the mainspring spring 7 is fixed to the inner wall of the casing 2 as appropriate.

Reference numeral 8 denotes a piston, which has a male threaded portion 8a carved at one end thereof, and a columnar body 8b having a square cross section at the other end.

The piston 8 has its male threaded portion 8a screwed into the female threaded portion 5a of the shaft 4, and its columnar body 8b is supported by a rectangular bearing 9 and is attached to the casing 2 so as to be slidable in the axial direction while being restrained from rotation.

A lid 10 is provided at the opening of the casing 2 on the side where the spring 7 is attached.
are fixed by bolts 12, 12.

In such a structure, the rotational force of the shaft 4 due to the spring torque of the mainspring spring 7 can be converted into a propulsive force in the axial direction of the piston 8, and the present invention is directed to a propulsive force imparting device based on this principle. It is a locking mechanism.

Note that the reference numeral 11 is a bolt insertion hole. Hereinafter, the present invention will be described in the third section.
A detailed explanation will be given based on the embodiment shown in the figures and FIG.

The basic structure of the propulsion force applying device used in this explanation is the same as that of the conventional example described above, so the same members are given the same reference numerals, and the explanation of the basic structure is omitted to avoid duplication.

A split groove 20 is formed in the end of the leg portion 6 of the shaft 4 in the propulsion force applying device 1 in the axial direction, and a portion corresponding to the axis of the shaft 4 is formed in the lid body 10 forming the outer shell of the device 1. A through hole 30 having vertical grooves 30a, 30a perpendicular to the hole diameter is bored in the hole, and the dividing groove 20 and the through hole 30
and the stopper member 40 constitute a locking mechanism according to the present invention.

That is, the stopper member 40 is made of a plate-shaped body, with one end thereof having the split groove 20 and both sides thereof having the vertical grooves 30a, 30 of the through hole 30.
By connecting and engaging the shaft 4 with the spring 1, the rotation of the shaft 4 due to the spring torque of the spring 1 is locked.

At this time, the state of engagement of the stopper member 40 with the trapezoids 20, 30a, and 30a may be in a loosely fitted state, and even in this state, the shaft 4 is rotationally biased by the spring 7, and this rotational bias causes the stopper member 40 to move as described above. Trench groove 20.30a, 30
Since it is pressed by a, it will not fall off from the device 1.

The device 1 in this locked state is inserted into its bolt insertion hole 11°11.
After the stopper member 40 is fixed to the main body through the above-mentioned linkage, the stopper member 40 is released from the above-mentioned linked engagement state, that is, the stopper member 40 is pulled out in the direction of arrow A as shown in FIG. When the engagement of the stopper member 40 is released (in this case, the engagement between the stopper member 40 and the vertical grooves 30a, 30a may be maintained as is), or as shown in FIG.
0 may be completely removed from the through hole 30), the shaft 4 is rotated in a fixed direction by the spring torque of the spring 1, and the piston 8 is propelled in the direction of arrow B (see FIG. 4),
Press a chain, belt, etc. through an appropriate shoe.

Incidentally, reference numeral 50 is a cap made of a flexible member, which is attached to the device 1.
The device 1 is fitted into the through hole 30 so that muddy water or the like does not enter through the through hole 30 during use and impede the propulsion function of the device 1.

In addition, when performing maintenance such as tightening the spring 7 and pulling the piston 8 back into the device 1, remove the cap 50, insert a suitable jig such as a screwdriver through the through hole 30, and use the jig This is done by engaging the tip of the shaft 4 with the groove 20 of the shaft 4 and rotating the shaft 4 in the direction in which the spring 7 is tightened.

Therefore, it is sufficient that the through hole 30 has a size and shape that allows the jig to be inserted and the shaft 4 to be rotated freely.
In the above embodiment, the vertical grooves 30a are provided at two opposing positions, but since the vertical grooves 30a restrict the rotation of the stopper member 40, it is not necessarily necessary to provide them at two locations. Even if it is installed in several places, it still fulfills its function.

Furthermore, the stopper member 40 is not limited to the simple plate-shaped body described in the above embodiment, but has a paragraph having a narrow part a, a middle part b, and a wide part 0 sequentially from the tip as shown in FIG. It may also be a plate-like body.

In this case, the width of the narrow part a is designed to be smaller than the diameter of the through hole 30, and the middle part is designed to be the vertical groove 30a of the through hole 30.
, 30a, and the wide portion 0 may be appropriately designed to be wide enough to be easily manipulated when rotating the shaft 4.

The stopper member 41 designed in this way is used in the following manner.

That is, with the tip of the narrow part a floating in the split groove 20 of the shaft 4 by 5 degrees, the middle part is thickly inserted into the lid body 1.
0), after rotating the stopper member 41 and rotating the shaft 4 in the direction in which the spring 7 is tightened, the stopper member 41 is completely pushed into the split groove 20, and at the same time the middle part The vertical grooves 30a, 30 of the through hole 30
a to lock the rotation of the shaft 4.

This lock is released by completely pulling out the stopper member 41 from the split groove 20 and the vertical groove 30a, or by disengaging only the groove 20, as in the above embodiment.

Next, the operation of the propulsive force applying device 1 equipped with the locking mechanism of the present invention will be explained based on FIG. 1.

In the figure, reference numeral 106 is a main body, and a chain 100 is stretched around gears 101 and 102 inside the main body 106.

Reference numeral 103 denotes a shoe, and the shoe 103 is attached so that one end thereof is in contact with the pivot 104 and one side thereof is in contact with the chain 100.

The propulsion force imparting device 1 is fixed to the main body 106 with a bolt 105, with the distal end of the piston 8 passing through a through hole of the main body 106 and in contact with the side surface of the shoe 103 opposite to the contact surface of the chain 100. There is.

The stopper member 40 or 41 is removed after the propulsive force applying device 1 is fixed to the main body 106 as described above.

FIG. 7 shows a state in which the stopper member 40 or 41 is removed.

In this state, a propulsive force in the direction of arrow B is applied to the shaft 8 by the spring force of the spring 7.

Therefore, when the chain 100 becomes loosened due to elongation or wear, the shaft 8 is pushed out in the direction of arrow B in accordance with the loosening of the chain 100, and the chain 100 is always maintained in a state without loosening.

This state is shown by the broken line in FIG.

When performing maintenance such as pulling back the shaft 8 in the direction opposite to the direction of arrow B, the propulsive force applying device 1 is moved to the main body 106.
It is very easy to operate the spring 7 by removing and adding the cap 50 and rotating the shaft 8 in the tightening direction of the spring 7 using an appropriate jig such as a screwdriver.

As described above, the locking mechanism according to the present invention can reliably perform the locking function despite having an extremely simple structure, and also has a propulsive force imparting device added to the main body, and the outer shell of the device is configured as follows. Since maintenance can be performed while the lid is attached, handling is extremely easy.

Furthermore, the locking mechanism according to the present invention does not require any special members or processing, and therefore has economic value such as low cost.

[Brief explanation of the drawing]

Figure 1 is an external view of the propulsion force imparting device, Figure 2 is same as above 1-I
A cross-sectional view of conventional mounting in a line cross section, Figure 3 is I of Figure 1.
-, a diagram of the device according to the present invention in a locked state in a cross-section along a line, FIG. 4 is a diagram of the unlocked state as above, FIG. 5 A is a left side view of FIG. FIG. 6 is a plan view showing another embodiment of the stopper member, and FIG. 7 is a usage state diagram of the propulsive force applying device equipped with the locking mechanism of the present invention. 4...Shaft, 1...Spring spring, 8...Piston, 10...Lid, 2
0... Division groove, 30... Penetration - Tl2O
...Stopper member, 50...Cap.

Claims (1)

[Claims] 1 Consists of a shaft with a spring attached to one end and a piston screwed onto the other end of the shaft, which converts rotational force from the spring torque of the shaft into an axial propulsive force of the piston via the screwed part. In the converting propulsion force imparting device, a split groove is formed at one end of the shaft, and at least one vertical groove perpendicular to the hole diameter is formed in a portion corresponding to the axis of the shaft of a casing lid forming an outer shell of the device. A locking mechanism in a propulsive force imparting device, characterized in that at least one through hole is formed in the hole wall, and a stopper member is removably connected and engaged with the split groove of the shaft and the vertical groove of the through hole. .