JPH0683952B2 - Cordless sander - Google Patents

Description

TECHNICAL FIELD The present invention relates to a polishing machine for polishing a material to be processed with abrasive paper.

(Prior Art) As a conventional technology, there is, for example, Japanese Utility Model Laid-Open No. 51-74286.

(Problems to be Solved by the Invention) In the conventional polishing machine described in the above publication, the polishing paper that is replaceably attached to the base is simply locked by using the elastic force of the locking member. Therefore, when replacing the abrasive paper, the locking member must be continuously lifted against its elastic force. Therefore, the work of exchanging the abrasive paper had to be performed with one hand, and the work was extremely troublesome.

Therefore, in view of the above-mentioned conventional drawbacks, the present invention can extremely easily and quickly replace the abrasive paper,
It is an object of the present invention to provide a cordless polishing machine that can reliably perform polishing work.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention enables a base for mounting abrasive paper for polishing along a lower surface to a base portion of an abrasive machine in a plane motion operation. The base is formed with a desired space between the upper surface and the lower part of the base part and is located in a substantially planar shape of the base part, and is attached to the base in the space. A clamper that locks the polishing paper with elastic force is provided, and an operation member that disengages the elastic lock of the clamper with respect to the polishing paper is provided on the base so as to be retractable. The gist of the present invention is to provide a hooking portion that can be locked when the operating member protrudes from the inside of the cavity so that the clamper holds the unclamped state of the abrasive paper by the operating member.

(Operation) According to the above configuration, the clamper is lifted against the elastic force of the operating member, and the operating member is hooked on the hooking portion of the base to fix the clamp in the lifted state. The abrasive paper is exchanged in this state. Also, not only the clamper but also the operating member is stored in the space between the upper surface of the base and the lower part of the base part, so that the polishing work can be performed securely during the polishing work without carelessly operating the clamper and the operating member. Is performed.

(Embodiment) Next, an embodiment of the present invention will be described with reference to the drawings. In the drawing, reference numeral 1 is a housing of a polishing machine main body H, and a pair of left and right half halves 1A, 1B are vertically divided. The handle part 3 is assembled to be capable of being formed into a substantially inverted H shape on the side surface, and a handle part 3 which is horizontally long for accommodating the battery 2 in an insertable / detachable manner and for gripping at the time of work is disposed on the upper part thereof. In addition, a motor housing portion 5 that houses a motor 4 rotatably driven by the battery 2 downward is provided below the central portion of the handle portion 3.
Further, a base portion 6 having an open lower surface, which is continuously provided below the motor housing portion 5 and accommodates the transmission mechanism D driven by the motor 4, is disposed at the lower end of the housing 1, and the handle portion 3 is provided. The base portion 6 and the base portion 6 are formed substantially vertically symmetrical with respect to the motor housing portion 5.

In addition, 30 is a battery holder installed in the handle portion 3,
Reference numeral 31 is a lid plate attached to the rear end of the handle portion 3 by a pin for opening and closing the handle portion.

Reference numeral 7 denotes a drive shaft of a transmission mechanism D rotatably supported in the base 6, and a gear 8 fitted to the upper end of the gear shaft meshes with a pinion 9 fitted to the lower end of the motor shaft 4a of the motor 4. The balancer 10 is rotatably driven so as to be co-rotatably fitted near the lower end thereof, and an eccentric shaft portion 7a slightly eccentric to the shaft center of the drive shaft 7 is formed at the lower end thereof, It projects below the base 6.

Reference numeral 11 denotes a base that is supported below the base 6 so as to be movable in a plane motion in a circular motion with respect to the base 6, and has a cylindrical bearing portion that is projected on the upper surface near the center thereof. The eccentric shaft portion 7a is provided in the shaft 11a in order to transmit the eccentric rotation of the eccentric shaft portion 7a of the drive shaft 7 to the base 11 to cause the base 11 to make a circular motion in the horizontal direction.
While the bearing 12 is fitted in, the base plate 13a at the upper end near the front and rear ends of the bearing 12 is formed horizontally in the base portion 6 near the front and rear ends, respectively. A pair of left and right leg shafts 13 hooked on the 6a and hung vertically below the base plate 13a.
A pair of front and rear flexible feet 13 and 13 in which b and 13b are respectively fixed to the base 11 via screws 14 are juxtaposed,
Is movably connected to the base 6 via both feet 13 so as to be elastically displaceable in the horizontal direction.

Then, the weight of the handle portion 3 accommodating the battery 2 and
The weight of the main body of the sander is distributed so that the weight of the base 6 to which the base 11 is added is approximately balanced.

15 is a polishing paper attached to the lower surface of the base 11 for polishing.
16 and 16 are ridges 11 which are provided at the front and rear end portions of the base 11 near the front and rear end edges 15a and 15a of the polishing paper 15 folded back upward.
A pair of front and rear clampers that are elastically flexibly movable in the vertical direction with respect to the front and rear end portions on the base 11 in order to elastically clamp each other between b and 11b. Both ends of the base portion 16a are sandwiched between the base 11 and the foot 13, while the outer end of the base portion 16a is bent downward so as to hold the vicinity of the front and rear edge 15a of the polishing paper 15. A horizontally long pressing portion 16c is continuously provided via a narrow width flexible portion 16b, and further, a clamp 16 is bent at the center of the pressing portion 16c so as to add or remove the clamp pressure of the clamper. A substantially strip-shaped operating member 17 is horizontally pinned so as to be rotatable, and the operating member 17 is attached to the inner wall surface 6c of the front and rear wall portions 6b of the base 6.
When it is rotated to a position substantially orthogonal to, the operating member 17 can be lifted to move the pressing portion 16c upward, and the clamper 16 can be bent upward, while the operating member 17 is provided at the inner end edges of both ends of the pressing portion 16c. The pressing portion 16c is rotated until it abuts on the stopper 16e.
When placed side by side, the operation member 17 is located on the front and rear walls of the base 6.
6b and the ridge 11b of the base 11 are retracted into the gap, and
The protrusion 17a provided on the lower surface near the central portion of the operating member 17 engages with the long hole 16f formed in the pressing portion 16c, and the operating member 17 is locked in the retracted state. Then, a lock piece 18 bent in an inverted L shape is provided on one side of the base end portion of the operation member 17 so as to project,
At the tip of the upper piece 18a of the lock piece 18, there is slightly a hooking edge 18b formed so as to be opposed to the inner wall surface 6c in an inclined shape when the operating member 17 is rotated so as to be orthogonal to the inner wall surface 16c. The operating member 17 is extended so as to rotate so as to be orthogonal to the inner wall surface 6c, and then lifted up.
When the operating member 17 is slightly rotated in the direction in which b approaches the inner wall surface 6c, the engaging edge 18b engages with the engaging portion 19 projecting from a part of the lower end of the inner wall surface 6c, and the operating member 17 pushes the operating portion 17c. With it, it is locked in the upward movement state, and the clamper 16 can be locked with the clamp pressure of the clamper 16 released.
Further, when the engaging member 18b is pushed in the direction in which the engaging edge 18b is separated from the inner wall surface 6c, the clamper 16 is elastically restored and the locked state of the clamper 16 is released.

Next, a switch mechanism S for starting and stopping the motor 4
Referring to FIGS. 5 to 7, 20 is fitted in the recesses 21 and 21 in the handle portion 3 which are respectively recessed in both half-cut bodies 1A and 1B, and is sandwiched between both half-cut bodies 1A and 1B. Switch near the right edge of the figure on the top of the switch.
A push button 20a for opening and closing the contacts of 20 to start and stop the motor 4 is projected so as to be able to move downward and elastically return.

Reference numeral 22 denotes a switch rod which is inserted into the handle portion 3 so that the push button 20a of the switch 20 can be pushed down and released, and is pushed laterally across both the half halves 1A and 1B. Is inserted slidably into the insertion hole 23 formed in a hole shape, and is always urged in the removal direction by the spring 24 inserted at the hole end of the insertion hole 23, and the vicinity of the base end 22a is The sliding portion 2 is formed in a stepped columnar shape and is exposed to the outside of the handle portion 3 and has a substantially semi-cylindrical portion in front of the base end 22a.
2b is generated, and the lower surface 25 of the sliding portion 22b is slidably brought into close contact with the upper surface of the switch 20 and is formed in a flat shape so that the rotation of the switch rod 22 is restricted. The switch rod 2 is provided near the tip of the lower surface 25 of the sliding portion 22b.
When the switch is inserted into the insertion hole 23 and assembled to the handle part 3, the push button 20a of the switch 20 is slidably brought into contact with the push button 20a.
25 The inner sliding contact surface 28 is formed to incline upward in order to push it down, while the lower surface 25 is formed near the base end.
25 Allowing the upward movement of the push button 20a pushed down to hold the push button 20a in the engaged state, and restricting the removal of the switch rod 22 so that the switch rod 22 is attached to the handle portion 3. An engaging portion 27 is provided as a recess for stationary mounting in the assembled state, and a switch rod is provided on the outer surface of the engaging portion 27.
Switch rod with 22 attached to the handle 3.
When pushing the inward 22 against the spring 24 until the inner end face 32 of the base end 22a contacts the right end face of the switch 20, slide the slide contact with the push button 20a to guide the downward movement of the push button 20a and push it. button
Outer sliding contact surface 29 for pushing down 20a below the lower surface 25 near the base end
Is formed in parallel with the inner sliding contact surface 28, and the handle portion 3
When the switch rod 22 fixed on the switch is pushed inward, the push button 20a is pushed down by the outer sliding contact surface 29 and the switch 20
When the switch rod 22 in the pushed state is released, the switch rod 22 is elastically retracted to return to the original position and the push button 20a is closed.
Rushes into the engaging portion 27, the contact of the switch 20 opens, and the motor 4 is stopped.

Next, the operation and effect of the embodiment having the above-mentioned configuration will be described.

By the way, in this example, the housing 1 of the main body H of the sander is provided with the handle portion 3 which is capable of accommodating the battery 2 and being grippable.
Are continuously provided above a motor housing 5 formed for housing a motor 4 which is rotationally driven by a battery 2, while a base 11 having a polishing paper 15 attached to the lower surface for circular motion can be operated. The base portion 6 supported by the above is continuously provided below the motor housing portion 5.

For this reason, the power cord is not required and the range of movement by the power cord can be eliminated, so that the handling and polishing work of the polishing machine can be simplified, and the weight of the polishing machine body H is vertically balanced during the polishing work. The main body H can be smoothly moved and operated, and the workability can be significantly improved.

Further, in this example, since the operating member 17 of the clamper 16 for holding the polishing paper 15 is formed with the lock piece 18 for locking the clamper in the released state of the clamper,
This has the effect of simplifying the attachment / detachment operation of the polishing paper 15.

Further, the switch rod 22 of the switch mechanism S for starting and stopping the motor 4 is inserted into the insertion hole 23 of the handle portion 3 so as to be locked by the push button 20a of the switch 20 and assembled to the handle portion 3. Since it is attached, there is an effect that the switch mechanism S can be simplified.

(Effects of the Invention) As described above, according to the present invention, the clamper is lifted by the operating member against the elastic force thereof, and the operating member is hooked on the hooking portion of the housing to lift the clamper. Since it can be fixed in the state, it is not necessary to continue to lift the operation member of the clamper during the work such as replacement of the abrasive paper, and this work can be performed with both hands, and the work can be speeded up. The property can be improved, and the abrasive paper can be easily installed in a tension state along the bottom surface of the base.

Further, according to the present invention, not only the clamper but also the operating member can be housed in the space between the upper surface of the base and the lower portion of the base portion, so that the damper and the operating member are inadvertently operated during the polishing work. It is possible to prevent the accident of releasing the fixed state of the polishing paper, and to reliably perform the polishing work.

[Brief description of drawings]

The drawings show one embodiment of the present invention. Fig. 1 is a longitudinal sectional view of a main body of a sander, Fig. 2 is an exploded perspective view of the same, Fig. 3 is a perspective view of a clamper, and Fig. 4 is a plan view of the same. 5 (a) is a front sectional view showing an off state of the switch, FIG. 5 (b) is a front sectional view showing an on state of the switch, FIG. 6 is an exploded front view of the switch mechanism, and FIG. It is a perspective view of a switch rod. 1 ... Housing, 2 ... Battery, 3 ... Handle part, 4 ... Motor, 5 ... Motor storage part, 6 ... Base part, 11 ... Base, 15 ... Abrasive paper

Claims (1)

[Claims] 1. A base for mounting a polishing paper for polishing along a lower surface thereof is supported by a base portion of a polishing machine so as to be movable in a plane, and the upper surface of the base and a lower portion of the base portion are supported. A desired space is formed between them, and the space is located in a substantially planar shape of the base part. In this space, a clamper for elastically locking the abrasive paper attached to the base is arranged, The clamper is provided with an operating member that disengages the elastic lock of the clamper with respect to the abrasive paper so as to be retractable in the cavity, and the base part can be locked when the operating member projects from the cavity. A cordless polishing machine, characterized in that a hooking portion is provided so that the clamper holds the polishing paper against the polishing paper by the operating member.