JP2002281829A - Handle of machine tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a handle for machine tools capable of obliquely operating the handle without anxious described below by solving a problem that a user is necessary to be careful to bring the skin of the user's hand holding the handle not to be bitten in the gap between a fixed lever and a movable lever, thus the handle was not good to be handled. SOLUTION: In this handle for machine tools, a large number of protruding ridges 11c are arranged in parallel on the upper surface of a movable lever 11, while a large number of convex units 10c are installed at the periphery of a fixed lever 10 to arrange the protruding ridges 11c and the convex units 10c to be mutually engaged and the mouth of a space formed between them is formed in a notched shape in which a large number of irregular shapes are repeated in a short period.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a handle suitable for a power tool such as a hedge clipper called a hedge trimmer.

[0002]

2. Description of the Related Art For example, the above-mentioned hedge trimmer has two handles on a front side and a rear side of a main body, and holds a front front handle with one hand and a rear main handle with the other hand. The main switch built in the main unit is turned on and the main unit is started only when the switch levers provided on each handle are turned on at the same time, thereby preventing accidental malfunction. are doing. FIG. 7 shows a state where the upper part of the front handle 30 is gripped by one hand H. Generally, the front handle 30 is provided with a fixed lever 31 fixed to the main body.
And a movable lever 32 that inclines back and forth with respect to the fixed lever 31. While holding both the fixed lever 31 and the movable lever 32 with one hand H, the grip is strengthened to move the movable lever 32. It is configured to be turned on by tilting it toward the fixed lever 31 (to the right in FIG. 7). Although not shown, a compression spring is interposed between the fixed lever 31 and the movable lever 32, whereby the movable lever 32 is spring-biased in a direction to separate from the fixed lever 31.

[0003]

In such a front handle 30 as described above, when the user tilts the movable lever to the fixed lever side, the user of the hand H gripped between the movable lever and the fixed lever is conventionally used. It is necessary to perform the operation while paying attention not to bite the skin S (meat), and in this regard, the conventional front handle 30 is not easy to operate. FIG. 7 shows a state in which the skin S of the hand H holding the front handle 30 has been bitten into the gap D between the fixed lever 31 and the movable lever 32. The present invention relates to a handle of an electric tool, in which a movable lever is tilted with respect to a fixed lever, and there is a possibility that the skin of a hand may bite into a gap between the fixed lever and the movable lever during the tilt operation. As a result, an object of the present invention is to provide a handle excellent in operability.

[0004]

To this end, the present invention provides a handle having the structure described in each of the above claims. According to the handle of the first aspect, the mouth shape of the gap formed between the end edge of the fixed lever and the opposing surface of the movable lever is bent into a waveform in which a large number of uneven shapes are repeated in a short cycle. When the handle is gripped and the movable lever is tilted, the skin of the gripped hand is less likely to be bitten into the gap, and the user can operate the handle without worrying about biting of the skin. Operability of the handle can be improved. According to the handle of the second aspect, the biting of the skin can be more efficiently prevented as compared with the case where the uneven shape has a gentle curved shape. According to the handle of the third aspect, the skin biting prevention function can be exhibited most effectively.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention will be described with reference to FIGS.
Explanation will be given based on FIG. FIG. 1 shows a hedge trimmer as an example of a power tool. The basic configuration such as the operation mechanism of the hedge trimmer does not need to be particularly changed as compared with the conventional configuration, and therefore the description thereof is omitted. As shown in FIG. 1, the hedge trimmer 1 includes a main body 2, a main handle 3 provided at a rear portion of the main body 2, a front handle 4 provided at a front portion of the main body 2, and a front portion of the main body 2. The blade 5 is provided so as to protrude forward from the front. The main handle 3 has an upper handle 3 a extending rearward from an upper rear surface of the main body 2 and an annular lower handle 3 b extending rearward from a lower rear surface of the main body 2. An upper switch lever 3 is provided on the lower surface side of the upper handle 3a.
The lower switch lever 3d is disposed on the inner peripheral side of the lower handle 3b. The upper switch lever 3c is turned on by tilting with the hand holding the upper handle 3a.
d is turned on by tilting the lower handle 3b with the hand holding it. A power cord 3e is inserted into the rear end of the upper handle 3a.

The front handle 4 includes a fixed lever 10 fixed to a lower portion of the front surface of the main body 2 and a movable lever 11 provided on the rear side of the fixed lever 10 so as to be tiltable back and forth. The fixing lever 10 has a substantially U-shape as shown in the figure, and extends obliquely upward from one side of the lower front surface of the main body 2.
The lower part of the front surface of the main body 2 reaches the other side (hidden by the main body 2 in FIG. 1). The movable lever 11 also has a substantially U-shape, is disposed substantially along the fixed lever 10, and is supported so as to be tiltable with its lower end side as a tilt center. The movable lever 11 is spring-biased in a direction away from the fixed lever 10 (to the left in FIG. 2). The fixed lever 10 and the movable lever 11 (front handle 4) are gripped with one hand, and the movable lever 11 is turned on by tilting the movable lever 11 toward the fixed lever 10 (forward) against the urging force of the spring. As described above, each of the fixed lever 10 and the movable lever 11, both of which have a U-shaped frame shape, has an upper horizontal frame portion along the width direction of the hedge trimmer 1 and two left and right vertical frame portions along the vertical direction. are doing.

The user grips the upper handle 3a or the lower handle 3b of the main handle 3 with one hand, grips the front handle 4 with the other hand, and turns on the upper switch lever 3c or the lower switch lever 3d. Further, by turning on the movable lever 11, the main switch built in the main body 2 is turned on,
As a result, the drive motor incorporated in the main body 2 is activated, and the blade 5 operates. As described above, the use of the hedge trimmer 1 requires a two-handed operation, so that careless malfunction is prevented. The description of the drive mechanism including the main switch and the drive motor is omitted. A guard plate 6 is arranged on the front side of the front handle 4 so as to shield the front of the front handle 4. The guard plate 6 prevents cut pieces such as hedges scattered by the pruning work from scattering to the hand holding the front handle 4 or the user.

Next, as shown in FIG. 2, the fixed lever 10 of the front handle 4 has a U-shaped cross section.
In a state where the movable lever 11 enters the inside of the character-shaped portion, the movable lever 11 tilts in the left-right direction in the figure. A small gap D1 is formed between the outer peripheral edge 10a of the fixed lever 10 and the outer peripheral surface 11a (the upper surface in the figure) of the movable lever 11 facing the outer peripheral edge 10a. Also, a slight gap D2 is formed between the inner peripheral edge 10b of the fixed lever 10 and the inner peripheral surface 11b (the lower surface in the figure) of the movable lever 11 facing the inner peripheral edge 10b. I have. In the present embodiment, the outer peripheral surface 11a and the inner peripheral surface 11b correspond to the "opposed surface of the movable lever" defined in the claims.

On the outer peripheral surface 11a of the horizontal frame portion of the movable lever 11, projections 11c to 1c having a large number of tooth shapes (trapezoidal cross sections)
1c is formed. Each ridge 11c has a movable lever 1
1 (in the horizontal direction in FIG. 2),
The ridges 11c to 11c are arranged in parallel with each other at substantially equal intervals along the direction in which the horizontal frame portion of the movable lever 11 extends (the direction perpendicular to the plane of FIG. 2, the width direction of the hedge trimmer 1). . Due to the protrusions 11c to 11c, the upper surface of the horizontal frame portion of the movable lever 11 is formed in a continuous uneven shape (so-called jagged state). In the present embodiment, the large number of protrusions 11c to 11c have a width of about 5 m.
A total of twelve are formed at intervals of about 5 mm. However, only the interval at one center is set to about 10 mm. Corresponding to the protrusions 11c to 11c on the movable lever 11, a large number of protrusions 10c to 10c are formed on the rear edge of the outer peripheral edge 10a in the range of the horizontal frame of the fixed lever 10. I have. Each of the ridges 11c enters between the convex portions 10c. That is, the protrusions 11c to 11c on the movable lever 11 side and the protrusions 10c on the fixed lever 10 side.
c to 10c are engaged with each other. For this reason, the outer peripheral edge 10 of the fixed lever 10 in the horizontal frame portion
a between a and the outer peripheral surface 11a of the movable lever 11
As shown in FIG. 3, the mouth shape is formed in a jagged (irregular shape) waveform that bends up and down at intervals of about 5 mm when viewed from behind (as viewed from the direction of arrow (R) in FIG. 2). .

According to the front handle 4 of the present embodiment configured as described above, the user grips the front handle 4 and strengthens the grip of the gripped hand so that the movable lever 11 can resist the urging of the spring. When the switch is turned on, the skin of the hand is prevented from being bitten by the mouth of the gap D1.
According to the front handle 30 having the conventional configuration shown in FIG. 7, since the mouth shape of the gap D between the fixed lever 31 and the movable lever 32 has a substantially straight shape, the skin S of the grasped hand H is bitten. It was easy to fit. In this regard, according to the front handle 4 of the present embodiment, the mouth shape of the gap D1 between the fixed lever 10 and the movable lever 11 is formed in a waveform in which a large number of uneven shapes (jagged shapes) are repeated. The skin S of the hand H does not bite into the mouth of the gap D1 due to the movement of the movable lever 11,
Thereby, the operability of the front handle 4 can be improved.

Various modifications can be made to the embodiment described above. For example, a ridge 11c-1 having a trapezoidal cross section
1c and the trapezoidal convex portion 10c are illustrated in accordance with the example, but as shown in FIG.
A configuration in which the mouth shape of the gap D3 is formed into a waveform in which a rectangular uneven shape mainly composed of a linear component is repeated by combining with the rectangular (square) convex portions 13a to 13a on the three sides. As shown in FIG. 5, a gap D4 is formed by a combination of the ridges 14 to 14 having an arc-shaped cross section on the movable lever 14 side and the arc-shaped protrusions 15 to 15 on the fixed lever 15 side.
May be formed to have a waveform in which arc-shaped irregularities mainly composed of a curved component instead of a straight-line component are repeated. Approximately 5 mm to 10 m for gaps D3 and D4
By setting the irregular shape to be repeated at intervals of about m, the same operation and effect as described above (the function of preventing the skin S of the grasped hand H from biting the skin S) can be obtained. As shown in FIG. 6, the distance between the projection 16a of the fixed handle 16 and the ridge 17a of the movable handle 17 is about 20 mm or more, and the unevenness of the gap D5 is 20 m.
If the waveform is repeated in a long cycle of about m or more and becomes a so-called jagged waveform, the biting prevention function is reduced or eliminated.

Further, the configuration in which the horizontal frame portion of the front handle 4 is provided with a biting prevention function has been exemplified. However, the same vertical bite portion or the vertical frame portion and the horizontal frame portion (almost the entire circumference of the front handle) are similarly engaged. It is also possible to adopt a configuration in which an intrusion prevention function is provided. Further, although the front handle 4 in which the movable handle 11 is located on the front side (rear side) with respect to the fixed handle 10 when viewed from the user side has been illustrated, the present invention may be applied to a handle in which mutual positions are reversed. it can. The tilting direction of the movable handle with respect to the fixed handle may be forward or backward as illustrated, or may be upward or downward, and may be applied to a movable handle that tilts in various directions. Furthermore, the hedge trimmer is illustrated as an example of the power tool. However, the fixed handle and the movable handle that tilts with respect to the fixed handle are provided, and the movable handle is tilted toward the fixed handle by grasping both handles with one hand and strengthening the grip. The present invention can be widely applied to a power tool having a handle in a form to be operated.

[Brief description of the drawings]

FIG. 1 is a view showing an embodiment of the present invention, and is a perspective view of a hedge trimmer as viewed obliquely from behind.

FIG. 2 is a sectional view taken along line (2)-(2) of FIG. 1;
It is a longitudinal section of a front handle.

FIG. 3 is a view as viewed from a direction of an arrow (R) in FIG. 2, and is a view showing another shape of a gap between a fixed handle and a movable handle.

FIG. 4 is a view as seen from the direction of the arrow (R) in FIG. 2, and is a view showing another shape of a gap between a fixed handle and a movable handle.

5 is a view as seen from the direction of the arrow (R) in FIG. 2, and is a view showing another shape of a gap between a fixed handle and a movable handle.

FIG. 6 is a diagram showing a gap between the fixed handle and the movable handle, and showing a gap having irregularities at large intervals. The anti-jamming function of the present invention is not exhibited by the uneven shape having the intervals shown in FIG.

FIG. 7 is a side view showing a state in which a conventional handle is gripped by hand. This figure shows a state in which the skin S of the grasped hand is bitten into the gap D between the fixed handle and the movable handle.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Hedge trimmer (power tool) 2 ... Body part 3 ... Main handle, 3a ... Upper handle, 3b ...
Lower handle 4 ... Front handle 5 ... Blade 10 ... Fixed lever 10a ... Outer periphery side edge 10c ... Protrusion 11 ... Movable lever, 11a ... Outer peripheral surface, 11c ... Protrusion D1 ... Upper gap (outer periphery of movable lever 11) (Gap between the surface 11a and the outer peripheral edge 10a of the fixed lever 10) 30 Front handle having a conventional linear gap D 31 Fixed lever 32 Movable lever H Gripped hands D3, D4 Gaps having a shape and having a skin biting prevention function D, D5: gaps having no skin biting prevention function

Claims (3)

[Claims] 1. A fixed lever provided on a main body of a power tool, and a movable lever provided so as to be tiltable with respect to the fixed lever, wherein both the levers are gripped to tilt the movable lever toward the fixed lever. A handle to be operated, wherein a number of protrusions extending in the tilting direction of the movable lever are arranged in parallel on an opposing surface of the movable lever that moves relative to an edge of the fixed lever with the tilting operation of the movable lever. On the other hand, a number of protrusions that mesh with the ridges are provided at the edge of the fixed lever, and the mouth shape of the gap formed between the edge of the fixed lever and the opposing surface of the movable lever is increased. A handle characterized in that the uneven shape is bent into a waveform that is repeated in a short cycle. 2. The handle according to claim 1, wherein the ridge has a rectangular cross-sectional shape, while the protrusion has a rectangular shape,
A handle in which the mouth shape of the gap has an uneven shape mainly composed of a linear component. 3. The handle according to claim 1, wherein the shape of the opening of the gap has a waveform in which the uneven shape is repeated in a short period of 5 mm to 10 mm.