JPH0570901U - Revolving folding folding saw - Google Patents

Abstract

(57) [Abstract] [Purpose] When you need to perform sawing work at a work site with poor scaffolding, carrying is convenient and safe, and operability and work can be performed without interference from the surroundings during operation. It is an object of the present invention to provide a flip-up rotary folding saw having excellent properties. [Structure] A saw replacement blade having a round hole and a slit at the tail end of the saw blade, a saw holder for holding the saw blade detachably and rotatably, and a saw blade around the round hole at the front end of the saw holder. A bushing that is provided with a pivotally supported shaft support and that is slidable in the axial direction by engagement of the bushing fixed to the inner surface of the saw holder and the operating screw shaft fitted to this bushing and the operating screw shaft. The saw ring, which comprises a pivot ring, locks the slit of the saw blade by a rotary ring that can rotate with respect to the bushing, and applies a spring biasing force to the rotary ring to hold the saw blade in the saw holder. The flip-out rotation from the retracted position to the deployed position for use, and the retracted rotation, which is the opposite, are achieved safely and reliably.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 In this invention, the folding saw, that is, the base of the saw blade of the saw blade is pivotally supported with respect to the saw handle so that the saw blade can be stored in the vertical groove provided in the saw handle when not in use. For this type of saw, which is convenient for carrying and is also useful in terms of safety, a splash repellency was devised to improve the operability and the simplification of the structure, including the method of exchanging and attaching the saw blade. This is a proposal for an ascending rotary folding saw.

[0002]

[Prior Art]

 Japanese Utility Model Laid-Open No. 61-1803 discloses a latching device that locks the unfolded state of the saw blade with respect to the folding saw. Since it is necessary to rotate the saw blade around the support part with respect to the handle, it is difficult to handle with one hand, and it is the same in this point expansion operation as well, for example, in gardening work, like Takagi's branch dropping pruning. Moreover, it is inconvenient when used for work on an unstable scaffold.

[0003] Although not a foldable type, there is also known a pruning saw in which a replaceable blade type saw blade is inserted into a grip handle that is bent so that it fits comfortably in the palm, and fixed with screws, but this example is also known. When the leather case used for storing the saw blade is hung on the waist belt and the saw blade can be pulled out by one hand operation, the saw blade and the leather case can be pulled out to the branches. There is a happiness that hinders work in high places.

[0004]

[Problems to be solved by the device]

 Even with a posture in which one hand has already been blocked due to an unstable scaffold, which is often encountered in pruning for lowering branches of tall trees and assembling temporary frames for concrete work, one hand A folding saw that can be easily unfolded from the handle of the saw blade by work, and especially a flip-up rotary folding saw with a structure that makes it easy to attach and detach a spare blade The purpose of this device is to propose.

[0005]

[Means for Solving the Problems]

 This device consists of a pair of saw blades with a circular hole at the tail end and parallel slits that are slightly narrower than the inner diameter, and two mating shell halves that control detachable and rotatable saw blades. A saw holder and a shaft holder that holds the saw blade at one end of the saw holder so as to be rotatable around the center of the circular hole at the tail end of the saw holder. A bushing that can be fixed non-rotatably inside the saw holder, an operating screw shaft that fits in the shaft hole of this bushing and is freely rotatable, and a non-circular recess that is formed on the outside of the other half of the half of the mating shell. Engagement with the operating screw shaft having a retaining shaft neck through a mounting hole that opens into the bottom of the non-circular recess underneath the mating detent head The rotary folding saw that consists of a pivot ring of the saw blade that can slide only in its axial direction by The rotation ring that biases the saw blade from its retracted position to the deployed position so that it can rotate about the bushing, and the lower surface protrusion that engages with the slit in the saw blade is engaged with this rotation ring. And a pair of upper surface cuts for hooking the saw blades at the expanded and retracted positions of the saw blade, and a lock knob provided on the saw holder for selectively engaging with the pair of upper surface cuts. It is a flip-up folding fold saw that is characterized by

[0006]

[Action]

 The flip-up rotary folding saw configured as described above is easy to carry, for example, in a safe folding posture of the saw body even when working at a high place, and when using it, simply pull the slide knob 5 to hook the tip of the latch 9. Due to the biasing force stored in the spring built into the saw holder 2 when the saw is released, the saw blade rebounds and pivots to occupy the deployed position, at which time the saw blade is re-engaged by the latch 9. Sawing operations such as branching under the stop and on-site cutting of the concrete temporary frame can be performed stably. When you are finished using it, you can easily guide it to the folded position by supporting the back of the saw blade and rotating the saw handle against the spring. Can be easily reproduced.

Next, when the saw blade is cut off, the screw leg 13b of the operating screw shaft 13 loosens the restraint by the pivot support ring 15 of the saw blade by turning the rotary operation knob 14a, and the holding shaft neck When 14b comes out from the round hole 1a at the tail end of the saw blade, the used saw blade is pulled out by passing through the screw leg 13b by the slit 1b facing this, and the substitute saw blade 1 is replaced by the reverse procedure. The replacement can be suppressed by fitting and reverse rotation of the rotary operation knob 14a, and the replacement blade 1 can be replaced easily and easily.

[0008]

【Example】

 As a pruning saw for lowering branches of tall trees, it can be used with particular advantage when performing safe sawing at high places with one-handed operation, or in-situ cutting of a concrete temporary frame, especially when one hand is blocked. An example of a flip-up rotary folding saw that can be used will be described below.

Now, FIG. 1 is a projection view of a flip-up rotary folding saw according to the present invention in which a saw blade is easily attached and detached, in which a side surface (a), an upper surface (b) and a lower surface (c) of the saw blade in a developed posture are shown. In the figure, 1 is a saw blade, 2 is a saw holder that holds the saw blade of the saw blade 1 at its base end, 3 is a handle, 4 is a saw blade 1 at the front end of the saw holder 2. The structure of the shaft support that rotatably holds the blade at the tail end of the saw blade will be described later. Here, the saw holder 2 is shown in the figure as an example of sheet metal forming. It is composed of a pair of halves 2a and 2b, and 5 is a lock knob provided on the side surface of the saw holder 2, and 6 is a coil spring for returning the lock knob 5 (see FIG. 1 (c)).

FIG. 2 is a perspective view of the disassembled parts of the folding saw showing the unfolded attitude of the saw blade in FIG. 1, and is first shown in the lower half of the drawing, slightly toward the center 7 Is a bushing which is non-rotatably fixed by a non-circular (hexagonal) hole 2c inside one of the two mating shell halves 2a, 8 is a rotary ring which is rotatably fitted around a bushing 7, and 9 is a stopper. The slide latch 10 fixedly integrated with the lock knob 5 passes through the two mating shell halves 2a through the sliding long hole 2d by the screw 9a, and the spring latching tongue 9b of the slide latch 9 is urged. It is a spring case that is fixed inside the two mating shell half portions 2a so as to accommodate the return coil spring 6.

The bushing 7 has a cylindrical body 7a, a flange 7b, a detent (hexagonal seat) 7c, and a screw leg 7d. In this example, the rotary ring 8 has an outer peripheral cut-out groove 8a used for locking the string or cable 11b connected to the one end 11a of the tension spring 11 and an upper step seat 8b and a lower protrusion 8c. Secures the cord or cable 11b at its end loop 11c with a set screw 11d, and a pair of notches 8d and 8e facing each other on the upper step seat 8b in the diametrical direction are provided to select the tip projection 9c of the slide latch 9. The lower projection 8c is prepared for engagement with the cutout 1b which is continuous with the round hole 1a of the saw blade in preparation for the automatic engagement. On the other hand, as shown in FIG. 3, the rotary ring 8 is provided with a countersink recess 8f for accommodating the flange 7b of the bushing 7 and a central hole 8g concentric with the shell 7a of the bushing 7 to fit therein. 8 is supported by the body 7a of the bushing 7.

To the screw leg 7d of the bushing 7, a detent 7c adjacent to the screw leg 7d is fitted into a non-circular hole (hexagonal hole) 2c provided in one half 2a of the two mating shell half, and then a washer 11 is fitted. The nut 12 is screwed through the bushing 7 and the bushing 7 is fixed to the one half 2a of the two half shells together with the washer 11 in a non-rotatable manner. In this way, the operation screw shaft 13 is inserted into the shaft hole 7e of the bushing 7 from the side fixed with the nut 12, and the screw portion 13b formed at the end opposite to the rotation operation knob 13a is sawed on the flange side of the bushing 7. A threaded engagement with the pivot ring 14 of the body.

The pivot ring 14 has a detent head 14a that fits into a non-circular recess 2e formed by recessing the other half 2b of the two mating shell halves, and the detent head 14a A holding shaft neck 14b capable of accommodating a round hole 1a prepared at the tail end of the saw blade of the saw blade 1 is provided below the neck, and the holding shaft neck 14b is opened at the bottom of the non-circular recess 2e. It passes through the mounting hole 2f to be fitted, faces the flange 7b of the bushing 7, and is fitted into the counterbore hole 7f provided therein. Therefore, when the operation screw shaft 13 is rotated by the rotation operation knob 13a, the pivot ring 14 screw-engaged with the screw portion 13b becomes movable along the axial direction of the operation screw shaft 13.

Here, the spare blade 1 is inserted between the bushing 7 fixed to the two mating shell half portions 2a and the two mating shell half portions 2b, and the abutting edge 2g of the two mating shell half portions 2a, 2b. , 2h, it is necessary to easily insert through the gap between the two, so that in this example, the step edges 2i, 2j are formed at the abutting edges 2g, 2h of the two mating shell halves 2a, 2b, so the saw blade 1 is It is rotatable around the axis of the pivot ring 14 together with the rotary ring 8 under the engagement with the lower projection 8c of the rotary ring 8 of the tail end slit 1b of the saw blade, and is stored by this rotation. Under the posture, it receives the biasing force of the tension spring 11 acting on the rotary ring 8 and is urged to develop.

Therefore, the latching end 9c of the latch 9 of the slide knob is engaged with the upper surface notch 8e of the rotary ring 8 so that the saw blade retains the retracted posture, and the upper surface notch 8d is provided here. Lock the deployed position. This locking relationship is illustrated in more detail in FIG. In addition, 8h shown in FIG. 2 is a locking projection that frictionally locks the rotary ring 8 to the inner surface of the saw holder 2 at the deployed position of the saw blade to prevent the tension spring 11 from being loosened too much.

The joint handle 3 can be used as a saw handle by appropriately pressing the saw holder 2 which is united with a fixing screw and fixing the saw holder 2 with an adhesive or the like. In FIG. 1, 3a indicates a folding position of the saw blade. The slit 3b for accommodating and protecting the tooth tips is a hanging holding hole.

FIG. 5 shows another embodiment in which, instead of using the tension spring 11, the rotary ring 8 is designed to incorporate a spiral spring 11 ^' similar to a barrel barrel spring of a tape measure. In this case, the rotary ring 8'provides an annular cavity which surrounds the cylindrical body 7a of the bushing 7 and faces its flange 7b as a spring chamber 8 ", and also has a slit 8""for locking the outer end of the spiral spring 11 '. A slit 7'for locking the inner end of the spiral spring 11 'is added to the cylindrical body 7a of the bushing 7. The spiral spring 11' is provided with a spring biasing force that causes the saw blade to rebound and rotate. Try to store energy.

[0018] FIG 6, ^'the leaf springs ^6' button knob 5 press instead of using Suraizunobu 5 7 top notch 8d of rotating ^'its projecting end 9a via ^the' turning lever 9 which is biased by the ring 8, Another embodiment adapted to be selectively engaged with 8e is shown, and in the drawing, 9b ^' is a hinge pin.

[0019]

[Effect of the device]

 With this flip-up rotary folding saw, the sharp blade can be easily replaced with another saw replacement blade by simply turning the rotary operation knob, and in a safe folding position. It can be easily carried around, and even when it is used, the saw blade can be flipped up and turned to simply and securely take the deployed position by pulling the slide knob, and the structure is simple, so the practical benefits are remarkable.

[Brief description of drawings]

1A is a front view, FIG. 1B is a top view, and FIG. 1C is a bottom view.

FIG. 2 is an exploded perspective view.

FIG. 3 is a cross-sectional view of a main part.

FIG. 4A, FIG. 4B, and FIG. 4C are operation explanatory diagrams.

FIG. 5 is a sectional view of an essential part of another embodiment.

6 (a) and 6 (b) are a front view and a top view of a main part of another embodiment.

FIG. 7 is an exploded perspective view.

[Explanation of symbols]

1 saw blade 2 saw holders 2a, 2b two alignment shell halves 3 splicing pattern 4 axes支具5,5 ^'operating knob 7 the bushing 8 rotates ring 8c underside projections 8d, 8e top cuts 9 latch 11 spring 13 rotates the operation knob 15 pivot

Claims (1)

[Scope of utility model registration request] 1. A pair of a saw replacement blade having a circular hole at the tail end and a parallel slit slightly narrower than its inner diameter, and two mating shell halves for holding the saw blade in a detachable and rotatable manner. A saw holder and a shaft support that holds the saw blade at one end of the saw holder so as to be rotatable around the center of the circular hole at the tail end of the saw holder. A bushing that can be fixed non-rotatably to the inside of the saw holder, an operation screw shaft that fits in the shaft hole of the bushing and is rotatable, and a non-circular recess that is formed by recessing on the other side of the two mating shell halves. A retaining shaft neck that fits into the round hole at the tail end of the saw blade through the mounting hole that opens into the bottom of the non-circular recess below the neck of the mating detent head. In a rotary folding saw made of a pivot ring of a saw blade, which can slide only in the axial direction of the saw blade, A rotary ring for spring-biasing the saw blade from its retracted position to a deployed position is rotatably fitted around the bushing, and a lower surface protrusion engaging with the slit of the saw blade is attached to the rotary ring. And a lock knob provided on the saw holder for selectively engaging with the pair of upper surface cuts, the pair of upper surface cuts controlling hooking of the saw blades at the expanded and retracted positions of the body, respectively. Revolving folding fold saw.