JP2009046878A - Locking device for two expansive members - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a locking device having simplified construction and reduced cost by using a mounting outside member for preventing the rotation of a lever operating member. <P>SOLUTION: The locking device comprises a mounting body 15 to be fitted and fixed into a mounting recessed portion 10 provided in the side face of the outside member 3A, a stopper member 7 held to pass through the mounting body 15 from outward to inward, a resilient tool 16 for energizing the stopper member 7 in the mounting body 15 toward an inside member 3B, and the lever operating member 17 rockingly connected to the outside end of the stopper member 7 via a rocking shaft 38 for changing over the stopper member 7 between a locking position of protruding it from a through-hole 13 to the side of the inside member 3B and an unlocking position of pulling it back to the side of the through-hole 13. The lever operating member 17 abuts on two opposed wall faces 11 in the mounting recessed portion 10 so that its rotation around the axial center of the stopper member 7 is prevented. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a lock device that can be suitably used in a stretchable scaffolding plate or the like.

A scaffolding plate is known in which a pair of scaffolding plate halves holding a plurality of strips in parallel are assembled in a state in which the strips are alternately meshed to expand and contract each other (for example, Patent Document 1). Etc.). In this type of extendable scaffolding plate, the locking device (see above) prevents the scaffolding plate halves from expanding and contracting when the scaffolding plate halves are stretched to a predetermined length or contracted. (It is called a stopper mechanism in Patent Document 1).
This locking device is provided with a mechanism case on the strip material of one half of the scaffolding plate, pivoting an operating lever with a cam groove formed on the mechanism case, and connecting a stopper to the cam groove of the operating lever via a pin. In this structure, the control lever is pivoted and the stopper is advanced and retracted by the cam groove to engage and disengage the other scaffold plate half.
Japanese Patent Laid-Open No. 11-30033

In the above-mentioned lock device (the one of Patent Document 1), a mechanism case is required to pivotally support the strip material operating lever of the half of the scaffold plate, and a cam groove is formed in the mechanism case in order to move the stopper forward and backward. It is necessary, the number of parts is large, and the structure is complicated.
The present invention has been made in view of the above circumstances, and by using the two opposing flat surfaces of the outer member to which the device is attached, the lever operation member is prevented from rotating so that the structure can be simplified and the cost can be reduced. An object of the present invention is to provide a locking device for a stretchable two-member.

In order to achieve the above object, the present invention has taken the following measures.
In other words, the telescopic two-member locking device 1 according to the present invention pushes the stopper member 7 toward the inner member 3B from the outer member 3A toward the inner member 3B by expanding and contracting the outer member 3A and the inner member 3B, which are held to be stretchable. It is something to regulate.
And the attachment body 15 which has the insertion hole 13 in the recessed part back surface 12 in the side surface of the outer side member 3A, and is inserted and fixed with respect to the attachment recessed part 10 formed between the opposing 2 wall surfaces 11, and this attachment body 15 outside A stopper member 7 penetrating in the direction from the member 3A toward the inner member 3B and slidably held, and a resilient tool for applying a biasing force toward the inner member 3B to the stopper member 7 in the attachment body 15 16 and an end of the stopper member 7 projecting from the mounting body 15 toward the outside of the mounting recess 10 are slidably connected via a swinging shaft 38 so that the stopper member 7 is connected to the inside of the insertion hole 13. There is a lever operating member 17 that switches between a locking position for projecting to the member 3B side and an unlocking position for pulling back to the insertion hole 13 side against the bounce tool 16.

The lever operation member 17 is brought into contact with the opposing two wall surfaces 11 in the mounting recess 10 to prevent the stopper member 7 from rotating about the axis.
Due to such a configuration, the lever operating member 17 is in a state of being sandwiched between the two wall surfaces 11 while being in contact with the opposite two wall surfaces 11 in the mounting recess 10, and is a swing for switching between the lock position and the unlock position. Only movement is allowed. Therefore, the lever operating member 17 is prevented from rotating (slantly shifted) around the axis of the stopper member 7. As a result, the lever operating member 17 always maintains the determined direction and orientation, so that no mechanism case is required and the operation is facilitated.

  The lever operating member 17 intersects with the recess 45 fitted to the end of the stopper member 7, the lock surface 46 that comes into contact when the stopper member 7 is set to the locked position, and the lock surface 46. An unlocking surface 47 that abuts when the stopper member 7 is in the unlocking position, and the distance from the swing shaft 38 to the unlocking surface 47 is set to be larger than the distance to the locking surface 46, and the depression It is preferable to form a rocking restriction surface that abuts against the stopper member 7 and restricts the rocking when the lever operating member 17 further rocks from the unlock position.

With such a configuration, the lever operating member 17 is allowed to swing only from the unlocked position toward the locked position, and the reverse swing is applied to the stopper member 7 by the swing limiting surface. It will be blocked due to contact.
Therefore, if the lever operating member 17 in the unlocked position is erroneously operated in the opposite direction, the lever operating member 17 does not move and the stopper member 7 does not move. Can be prevented.
The mounting body 15 passes through the mounting surface portion 23 fixed to the recess back surface 12 of the mounting recess 10 and the insertion hole 13 of the recess back surface 12 from the mounting surface portion 23 and protrudes toward the inner member 3 </ b> B to project the impact tool 16. A pair of protrusions 24 located on both sides of the pair of protrusions 24, and a tip support part 25 that connects the tips of the pair of protrusions 24, and the attachment surface part 23 and the tip support part 25 have a through-hole in the stopper member 7. 30 and 31 are formed, and it is preferable that the mounting surface portion 23, the pair of protruding portions 24, and the tip support portion 25 are integrally formed by extrusion molding.

With such a configuration, the attachment body 15 can be significantly reduced in cost compared to the case where the attachment body 15 is made of sheet metal.
The lever operating member 17 has a knob portion 44 that swings around a swing shaft 38. The knob portion 44 is attached to the mounting recess 10 of the outer member 3A in the inner and outer directions at either the locked position or the unlocked position. It is better to place it inside.
With such a configuration, the knob portion 44 of the lever operating member 17 is not caught by surrounding objects or workers' clothes.

  In the locking device for the telescopic two-member according to the present invention, the lever operating member can be prevented from being rotated by the outer member to which the device is attached, and the structure can be simplified and the cost can be reduced.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIGS. 1 to 6 show a first embodiment of a locking device 1 according to the present invention. This locking device 1 is preferably used in an extendable scaffolding plate 2 as shown in FIGS. 4 to 6, for example. Can be used. This scaffolding plate 2 is used by spanning between stepladders and work tables that are set apart, and a pair of scaffolding plate halves 4 and 5 holding a plurality of strips 3 in parallel are mutually connected. The strips 3 are alternately meshed so as to expand and contract in a passing manner.
When viewed from one side of the scaffolding plate 2, the strip 3 on the side disposed outside (the scaffolding plate half 5 in the illustrated example) is defined as an outer member 3A, and the side disposed adjacent to the inner side of the outer member 3A (see FIG. In the example, when the strip 3 of the scaffold half plate 4) is set as the inner member 3B, the locking device 1 is configured to push and restrict the stopper member 7 from the outer member 3A toward the inner member 3B.

As shown in FIGS. 1 and 2, the outer member 3A has two parallel rectangular pipe-shaped portions and an intermediate plate portion connecting them, and is formed by extrusion molding. On the side surfaces, there are formed mounting recesses 10 corresponding to each other between the square pipe-like portions and having a groove shape along the longitudinal direction thereof.
The mounting recess 10 includes two opposing wall surfaces 11 and a recess back surface 12 that connects the inner wall portions of the both wall surfaces 11 to each other. The recess back surface 12 includes a locking device. A square hole-shaped insertion hole 13 is provided corresponding to the position where 1 is attached.

The inner member 3B is also formed of the same extrusion molding material as the outer member 3A described above, and has two parallel square pipe-shaped portions and an intermediate plate portion connecting between them. In the middle plate portion, when the scaffold plate halves 4 and 5 are stretched or contracted, the middle plate portion starts from a position where it matches the insertion hole 13, and in the vicinity thereof, in the longitudinal direction of the inner member 3B. A plurality of lock holes 14 are provided at predetermined intervals. Which lock hole 14 is to be selected is appropriately determined according to the amount of extension of the scaffolding plate halves 4 and 5.
As shown in FIG. 3, the locking device 1 includes an attachment body 15, a stopper member 7, a spring tool 16, and a lever operation member 17.

The mounting body 15 is adapted to be fitted and fixed to the mounting recess 10 of the outer member 3 </ b> A. The mounting surface portion 23 is fixed to the recess back surface 12 of the mounting recess 10, and the mounting surface portion 23 extends from the mounting surface portion 23. It has a pair of protrusion part 24 provided so that it may penetrate the penetration hole 13 of the surface 12, and may protrude to the inner member 3B side, and the front-end | tip support part 25 which connects the front-end | tip of this pair of protrusion part 24. FIG.
A square frame is formed by the mounting surface portion 23, the pair of protrusions 24, and the tip support portion 25, and a penetrating space of the stopper member 7 in the frame body and the elastic tool 16 extrapolated to the stopper member 7. A storage space is ensured. That is, the protrusion 24 is located on both sides of the bulleting tool 16.

In the attachment body 15, the attachment surface portion 23, the pair of protrusions 24, and the tip support portion 25 are all integrally formed by extrusion molding using an aluminum alloy or the like as a material. Therefore, the attachment body 15 is significantly reduced in cost as compared with the case where it is made of sheet metal.
Through holes 30 and 31 of the stopper member 7 are formed in the mounting surface portion 23 and the tip support portion 25 so as to be coaxial with each other.
With respect to the rectangular frame formed by the mounting surface portion 23, the pair of projecting portions 24, and the tip support portion 25, the mounting surface portion 23 projects from both projecting portions 24 in directions opposite to each other. A mounting hole 33 is provided in the projecting portion.

A fixing tool 34 such as a rivet, a tap screw, or a bolt is inserted into these mounting holes 33, and the mounting body 15 (locking device 1) is inserted so that the fixing tool 34 penetrates into the concave inner surface 12 of the outer member 3 </ b> A. The outer member 3A is fixed.
The stopper member 7 is slidably held through the attachment body 15 in the direction from the outer member 3A to the inner member 3B. At this time, the stopper member 7 passes through the through holes 30 and 31 provided in the attachment surface portion 23 and the tip support portion 25 of the attachment body 15 in a slidable state.
In the first embodiment, the stopper member 7 is formed of a round bar, and the tip portion directed toward the inner member 3B is assumed to be chamfered in a partial spherical shape. In addition, an axis penetrating in the diametrical direction perpendicular to the axis of the stopper member 7 is provided at the end opposite to the tip (the end protruding from the mounting body 15 toward the outside of the mounting recess 10). A hole 37 is formed. A rocking shaft 38 for connecting to the lever operating member 17 is inserted into the shaft hole 37.

Further, the stopper member 7 is a portion passing through the frame of the attachment body 15, and a stepped portion 39 is formed so that the tip end side is thick and the other end portion side (the one provided with the shaft hole 37) is thin. Yes. The elastic device 16 is extrapolated on the small diameter side with the step portion 39 as a boundary, and one end portion of the elastic device 16 is stopped against the step portion 39.
The elastic tool 16 is adapted to apply a biasing force toward the inner member 3B to the stopper member 7 in the attachment body 15, and a compression coil spring is shown in the drawing. As described above, one end portion of the impacting tool 16 is stopped against the step 39 of the stopper member 7, and the other end portion of the impacting tool 16 is attached to the attachment surface portion 23 of the attachment body 15. On the other hand, it comes into contact with the back surface (the surface facing into the frame).

As described above, the lever operating member 17 is swingably connected to the end of the stopper member 7 protruding from the mounting body 15 toward the outside of the mounting recess 10 via the swinging shaft 38. At this time, the axis of the swing shaft 38 is parallel to the recess back surface 12 of the mounting recess 10 and is orthogonal to the groove direction (longitudinal direction of the recess).
The lever operating member 17 has a cam main body 43 and a knob portion 44 protruding from the cam main body 43. The cam main body 43 has a width dimension W (see FIG. 3) along the axis of the swing shaft 38 such that the cam body 43 is in contact with the two opposing wall surfaces 11 with respect to the mounting recess 10 of the outer member 3A. In the mounting recess 10, the cam body 43 is formed so as to include “proximity” that does not cause backlash.

Therefore, the lever operation member 17 is prevented from rotating in the mounting recess 10 so as not to rotate around the axis of the stopper member 7.
The cam main body 43 is provided with a recess 45 fitted to the end of the stopper member 7, and the lock surface is positioned so as to intersect each other at right angles on both sides of the recess 45 (around the swing shaft 38). 46 and the unlocking surface 47 are provided. Further, a rocking restriction surface 48 is formed in the recess 45.
Therefore, when the cam main body 43 is swung around the rocking shaft 38, the lock surface 46 comes into contact with the mounting surface portion 23 of the mounting body 15, or the unlock surface 47 comes into contact with the mounting surface portion 23. The swing angle of the cam body 43 at this time is 90 ° because the lock surface 46 and the unlock surface 47 are orthogonal to each other.

The distance M (see FIG. 3) from the swing shaft 38 to the unlock surface 47 is set to be larger than the distance N (see FIG. 3) from the swing shaft 38 to the lock surface 46 (M> N). Therefore, the insertion hole 13 (the through hole of the tip support portion 25) of the attachment body 15 is more when the lock surface 46 is in contact with the attachment surface portion 23 than when the unlock surface 47 is in contact with the attachment surface portion 23. 31) The length from which the stopper member 7 protrudes is long.
In other words, when the stopper member 7 is operated to the locked position (when protruding from the insertion hole 13 to the inner member 3B side), the lock surface 46 comes into contact with the mounting surface portion 23 and the stopper member 7 is operated to the unlock position. When unlocked (when pulled back to the insertion hole 13 side), the unlocking surface 47 comes into contact with the mounting surface portion 23.

When the stopper member 7 is operated to the lock position or the unlock position, the corner portion of the cam main body 43 formed between the lock surface 46 and the unlock surface 47 is temporarily on the mounting surface portion 23. At this time, the compression of the bullet member 16 extrapolated to the stopper member 7 in the mounting body 15 is strengthened.
For this reason, every time the stopper member 7 is switched between the locked position and the unlocked position, a state that further opposes the resilient force of the resilient tool 16 occurs. This leads to the advantage of preventing return. It also leads to an advantage that a reliable response (clickable operation feeling) can be obtained for the operator.

When the unlocking surface 47 is in contact with the mounting surface portion 23 (see FIG. 2A), the swing limiting surface 48 is provided so as to contact the side surface of the stopper member 7 inside the recess 45 at the same time. Therefore, when the lever operating member 17 is in the unlock position, the swinging is restricted so that it does not swing further in the direction from the lock position to the unlock position.
That is, the lever operating member 17 is allowed to swing only from the unlocked position toward the locked position, and the reverse swing is prevented. Therefore, if the lever operating member 17 in the unlocked position is erroneously operated in the opposite direction, the lever operating member 17 does not move and the stopper member 7 does not move. Can be prevented.

The knob portion 44 protrudes obliquely from the cam main body 43 and swings as the lock surface 46 abuts on the attachment surface portion 23 or the unlock surface 47 abuts on the attachment surface portion 23. It swings around the moving shaft 38. In short, the operator puts his / her finger on the knob portion 44 and swings the lever operating member 17.
The knob portion 44 is formed so as to be positioned in the mounting recess 10 of the outer member 3A in the inner and outer directions both when the lever operating member 17 is in the locked position and when it is in the unlocked position. Thereby, it can prevent that the knob part 44 is caught in a surrounding thing, an operator's clothes, etc. FIG.

In the lock device 1 according to the present invention having such a configuration, a finger is put on the knob portion 44 of the lever operation member 17 and the lever operation member 17 is swung to the lock position or the unlock position to thereby move the outer member 3A. Expansion / contraction movement with the inner member 3B, that is, whether expansion / contraction in the scaffolding plate halves 4 and 5 can be freely switched.
That is, as shown in FIG. 1, when operated to the lock position, the stopper member 7 projects in a direction from the insertion hole 13 of the outer member 3A toward the inner member 3B, and engages with a predetermined lock hole 14 in the inner member 3B. As a result, the outer member 3 </ b> A and the inner member 3 </ b> B cannot move in the expansion and contraction (locked state).

2, when the stopper member 7 is operated to the unlock position, the stopper member 7 is pulled back to the insertion hole 13 side of the outer member 3A, and the engagement with the lock hole 14 of the inner member 3B is released. Thus, the outer member 3A and the inner member 3B can be freely expanded and contracted (unlocked state).
The locking device 1 according to the present invention has the following action. That is, since the lever operating member 17 is sandwiched in contact with the opposing two wall surfaces 11 in the mounting recess 10 of the outer member 3 </ b> A, the lever operating member 17 rotates around the axis of the stopper member 7. The lever operating member 17 can be easily operated without being shifted (obliquely tilted).

Further, since the rocking restricting surface 48 is formed in the recess 45 of the lever operating member 17, the lever operating member 17 is allowed to swing only from the unlocked position to the locked position, and the rocking in the opposite direction. Movement is blocked. Therefore, failure or damage of the stopper member 7 is prevented.
Since the attachment body 15 is integrally formed by extrusion molding, the cost is significantly reduced as compared with the case where it is made of sheet metal.
Since the knob portion 44 of the lever operating member 17 is positioned in the mounting recess 10 of the outer member 3A at both the locked position and the unlocked position, the lever operating member 17 is caught by surrounding objects or workers' clothes. There is no.

7 and 8 show a second embodiment of the locking device 1 according to the present invention. In the locking device 1 according to the second embodiment, a block piece-like shoe member 50 is provided at the distal end portion of the stopper member 7, and rack tooth-like irregularities 51 are provided on the projecting surface side of the shoe member 50. Yes.
On the other hand, the inner member 3B is provided with a shoe receiving member 52 at a portion where the shoe member 50 of the stopper member 7 protrudes and comes into contact. A rack tooth-like unevenness 53 that meshes with the unevenness 51 is provided.

Therefore, when the stopper member 7 is in the locked position (projecting position toward the inner member 3B), the unevenness 51 of the shoe member 50 meshes with the unevenness 53 of the shoe receiving member 52 provided on the inner member 3B. .
When the projections 51 and 53 are engaged with each other, the shoe member 50 and the shoe receiving member 52 are never displaced in the direction in which the outer member 3A and the inner member 3B expand and contract. , 5 can be said to be useful for further ensuring the non-extensible state (locked state).

By the way, the present invention is not limited to the above embodiments, and can be appropriately changed according to the embodiments.
For example, it is not limited to use for a stretchable scaffolding plate, and is suitable for a scaffolding base having a stretchable scaffolding plate, or having a stretchable two member such as a stretchable ladder or stepladder. Can be used for

FIG. 3A is a plan view of the first embodiment of the locking device according to the present invention, and FIG. 4B is a plan view taken along the line CC of FIG. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1A is a plan view of a first embodiment of a locking device according to the present invention when unlocked, and FIG. It is the perspective view which showed 1st Embodiment of the locking device which concerns on this invention. It is the top view which showed the usage example (extensible scaffold) of the locking device which concerns on this invention. It is the A section enlarged view of FIG. It is the EE arrow directional view of FIG. It is the perspective view which showed 2nd Embodiment of the locking device concerning this invention. It is the top view which showed 2nd Embodiment of the locking device concerning this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Locking device 3A Outer member 3B Inner member 7 Stopper member 10 Mounting recessed part 11 Wall surface 12 Recessed part inner surface 13 Insertion hole 15 Mounting body 16 Bouncer 17 Lever operation member 23 Mounting surface part 24 Projection part 25 Tip support part 30, 31 Through-hole 38 Oscillating shaft 44 Knob 45 Recess 46 Lock surface 47 Unlock surface 48 Oscillation limiting surface

Claims (4)

In a lock device that regulates expansion and contraction of an outer member (3A) and an inner member (3B) held in a mutually expandable manner by pushing a stopper member (7) from the outer member (3A) toward the inner member (3B). ,
A mounting body having an insertion hole (13) in the recess back surface (12) on the side surface of the outer member (3A) and fitted into and fixed to the mounting recess (10) formed between the two opposing wall surfaces (11) ( 15), a stopper member (7) that is slidably held through the attachment body (15) in a direction from the outer member (3A) toward the inner member (3B), and in the attachment body (15). A resilient tool (16) for applying a biasing force toward the inner member (3B) to the stopper member (7), and a stopper member (16) protruding from the mounting body (15) toward the outside of the mounting recess (10). 7) a lock position that is swingably connected to the end of the stopper member via a swing shaft (38) to project the stopper member (7) from the insertion hole (13) toward the inner member (3B); Switch to the unlock position to pull back to the insertion hole (13) against the impact tool (16) Has a lever operation member (17) that,
An expansion / contraction 2 member characterized in that the lever operating member (17) is brought into contact with two opposing wall surfaces (11) in the mounting recess (10) to prevent the stopper member (7) from rotating about the axis. Locking device.   The lever operating member (17) includes a recess (45) that fits into an end of the stopper member (7), a lock surface (46) that abuts when the stopper member (7) is in the locked position, An unlocking surface (47) that intersects with the locking surface (46) and abuts when the stopper member (7) is in the unlocking position. 47) is set larger than the distance to the lock surface (46), and when the lever operating member (17) further swings from the unlock position to the recess (45), the stopper member (7) 2. A locking device for a telescopic two-member according to claim 1, wherein a rocking restricting surface (48) is formed in contact with the rocking member to restrict the rocking.   The mounting body (15) has a mounting surface portion (23) fixed to the recess back surface (12) of the mounting recess (10), and an insertion hole (13) from the mounting surface portion (23) to the recess back surface (12). A pair of protrusions (24) that pass through and protrude toward the inner member (3B) and are located on both sides of the elastic device (16), and a tip support portion that connects the ends of the pair of protrusions (24) ( 25), and through holes (30, 31) of the stopper member (7) are formed in the mounting surface portion (23) and the tip support portion (25), and the mounting surface portion (23) and a pair of 3. The expansion / contraction two-member locking device according to claim 1 or 2, wherein the projecting portion (24) and the tip support portion (25) are integrally formed by extrusion molding.   The lever operating member (17) has a knob portion (44) that swings around a swing shaft (38), and this knob portion (44) is inward and outward in both the locked position and the unlocked position. The expansion / contraction two-member locking device according to any one of claims 1 to 3, wherein the locking device is located in the mounting recess (10) of the outer member (3A).

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