JPH0930798A - Lever unit for jack - Google Patents

Abstract

PROBLEM TO BE SOLVED: To clamp a clutch spring end in a simple structure as well as to miniaturize it by installing a ball energized in direction of projecting in the circular inner space of a holder part by a clutch spring, and making a tip of this ball cone into contact with the outer boundary of a clutch shaft housed in the holder part. SOLUTION: A ball type one-way clutch 10 transmitting turning force alone to one direction of a lever 1 is installed in space between a holder part 3 and a clutch shaft 4. This one-way clutch 10 is composed of a clutch spring 12 housed in a spring hole 11 of the holder part 3 and a ball 13, The clutch spring 12 being formed into coil form is inserted into this spring hole 11, and the one end, the ball 13 is energized so as to be projected toward a circular inner space 14 of the holder part 3, pressing it to an outer boundary of the clutch shaft 4. According to this method, it is unnecessary to clamp one end of the clutch spring 12, thus dipensing with special structure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jack lever device of a one-way clutch type.

[0002]

2. Description of the Related Art The applicant has provided a lever having a cylindrical holder portion at one end, a clutch shaft rotatably supported by the holder portion, and a clutch shaft provided between the clutch shaft and the holder portion. A one-way clutch that transmits the rotational power to the clutch shaft only when the lever is rotated in one direction, and a socket that is attached to at least one end of this support shaft and that is detachably connected to the lifting operation shaft of the jack, Has already applied for a lever device for a jack provided with (Japanese Patent Application No. 182711 in 1994).

[0003]

In the case of the above structure, since a large force is applied to the end of the clutch spring during operation, this fixing is difficult and the structure is complicated and the device becomes large. . Therefore, the present invention provides a clutch mechanism capable of fixing the end portion of the clutch spring with a simple structure and in a small size.

[0004]

In order to solve the above-mentioned problems, a jack lever device according to the present invention is a lever having a cylindrical holder portion at one end, and is rotatably supported by the holder portion. Attached to at least one end of the support shaft, and a one-way clutch that is provided between the clutch shaft and the holder part and that transmits the rotational power to the clutch shaft only when the lever is rotated in one direction. In a jack lever device including a jack lifting / lowering operation shaft and a socket that is detachably connected, the one-way clutch is formed so as to traverse the circular inner space of the holder portion at a position away from the center. The spring hole of the holder part, the clutch spring housed in this spring hole, and the circular inside of the holder part by this clutch spring Provided with a ball which is urged in a direction to protrude into between, characterized in that is in contact to the clutch shaft periphery housed the tip of the ball in the holder portion.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a partially cutaway sectional view showing an embodiment, FIG. 2 is a sectional view taken along line 2-2 of FIG. 1, FIG. 3 is a side view showing a socket portion, and FIG. It is a schematic diagram which shows.

This lever device, as shown in FIG. 4, has a lifting operation shaft b in a known jack a such as a pantograph type.
It is removably attached to a bracket c having a substantially U shape provided at the shaft end of the shaft and is rotated in one direction by using a one-way clutch to rotate the lifting operation shaft to lift the jack a. It is for.

A handle portion 2 is provided at one end of a long pipe-shaped lever 1, and a cylindrical holder portion 3 is attached at the other end. The handle portion 2 has a loop shape as shown in a portion B (a view from the direction of the arrow C).

As is apparent from FIGS. 1 and 2, the holder portion 3
The clutch shaft 4 is rotatably supported by the socket, and the socket 5 is attached to both ends of the socket mounting portion 4a having a circular cross section.
Are detachably attached with bolts 6.

The socket 5 is a side view (direction of arrow A in FIG. 1).
As shown in FIG. 3, the left and right ones can be used symmetrically, each of which is formed in a substantially quadrangular shape in cross section, and a pair of opposed sides 7 are formed with substantially rectangular detent holes 8. A notch portion 4b formed to have the same cross section as the rotation stop hole 8 is engaged with the end surface of the protruding portion of the socket mounting portion 4a.

Another pair of opposite sides 7 of this socket 5
Flange-shaped stoppers 9 that are parallel to the axis of the clutch shaft 4 and project along the left and right ends in the direction orthogonal to the axis are formed in pairs on the left and right of the bracket a of the jack a. It prevents the socket 5 from coming off when it is fitted into the socket 5 and rotated.

Referring again to FIGS. 1 and 2, between the holder portion 3 and the clutch shaft 4, there is provided a ball type one-way clutch 10 for transmitting only the turning force of the lever 1 in one direction. It comprises a clutch spring 12 and a ball 13 housed in a spring hole 11 of the holder portion 3.

As shown in FIG. 2, the spring hole 11 is bored from one side of the holder part 3 so as to cross the circular inner space 14 at a position away from the center of the holder part, and the tip is formed as a dead end. Has been done.

A clutch spring 12 formed in a coil shape is inserted into the spring hole 11, and one end of the clutch spring 12 urges the ball 13 so as to project toward the circular inner space 14 of the holder portion 3 to clutch the clutch. It is pressed against the outer circumference of the shaft 4.

Since the spring hole 11 is separated from the center of the holder 3 and crosses the circular inner space to form a chord, the opening of the spring hole 11 facing the circular inner space 14 of the holder 3 has an acute angle. A portion 15 and an obtuse angle portion 16 are formed.

Next, the operation of this embodiment will be described. In FIG. 2, when the lever 1 is rotated in the clockwise direction, the ball 13 bites between the clutch shaft 4 and the acute angle portion 15 to engage the clutch shaft 4 and the holder portion 3. For this reason, lever 1
Is transmitted to the clutch shaft 4, and the lifting operation shaft b can be rotated to operate the jack a either up or down.

On the other hand, when the lever 1 is rotated in the opposite direction (counterclockwise in FIG. 2), the ball 13 can roll around the clutch shaft 4 without biting into the obtuse angle portion 16, so that the clutch is in the disengaged state. . Therefore, by rotating the lever 1 in a reciprocating motion, the lifting operation shaft b of the jack a can be rotated in one direction.

As described above, according to this embodiment, it is not necessary to fix one end of the clutch spring 12 as in the conventional case, a special structure for that is not required, and the wall thickness of the holder portion 3 is utilized. Since a simple ball-type one-way clutch is sufficient, the structure is simple and highly reliable, and the clutch spring 12 can be downsized, so that the entire device can be made compact.

[0018]

A one-way clutch is formed by forming a spring hole in a direction transverse to the circular inner space of the holder part at a position away from the center and inserting a clutch spring and a ball in this spring hole. Thus, the jack can be moved up and down by transmitting only the rotation of one side of the lever to the clutch shaft.

Therefore, the one-way clutch structure is simple and reliable because it is not necessary to use a difficult structure for fixing the end portion of the clutch spring like the conventional one in which the clutch spring is wound around the clutch shaft. Since the clutch spring can be made high and the clutch spring can be made compact, the entire apparatus can be made compact.

[Brief description of drawings]

FIG. 1 is a partially cutaway sectional view of an essential part.

FIG. 2 is a sectional view taken along line 2-2 of FIG.

[Fig. 3] Enlarged side view of essential parts

FIG. 4 is a schematic diagram showing a usage state.

[Explanation of symbols]

1: Lever, 3: Holder part, 4: Clutch shaft, 5: Socket, 10: One-way clutch, 11: Spring hole, 12: Clutch spring, 13: Ball, 14:
Circular inner space

Claims (1)

[Claims] 1. A lever having a cylindrical holder portion at one end, a clutch shaft rotatably supported by the holder portion, and a lever provided between the clutch shaft and the holder portion to move the lever in one direction. For a jack provided with a one-way clutch that transmits the turning power to the clutch shaft only when it is turned to, and a socket that is attached to at least one end of this support shaft and is detachably connected to the lifting operation shaft of the jack. In the lever device, the one-way clutch includes a holder part spring hole formed to traverse a circular inner space of the holder part at a position away from the center, a clutch spring housed in the spring hole, and the clutch. It is equipped with a ball that is biased by a spring in a direction that projects into the circular inner space of the holder, and It is abutted to the clutch shaft periphery housed within the jack lever device according to claim.