JPH0618983Y2 - Lifting mechanism for spacer members of formwork - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION << Industrial Application Field >> The present invention relates to a concrete block molding formwork, and more particularly to a lifting mechanism for a spacer member of a core frame or an inner frame having a drawing structure.

《Prior art》 As a drawing structure for a tubular core frame, a structure is widely adopted in which a spacer member forming part of the circumference of the core frame is pulled up to form a drawing allowance, and the frame plate is drawn from both sides to remove the mold. Has been done. The conventional spacer member lifting mechanism in this structure is
As shown in FIG. 4, screw rods 32 having opposite-sided screw rods are provided on both sides, and screw rods 33, 34 on both sides of the screw rod 32 are provided.
The links 37, 38 pivotally attached to the center members 35, 36 respectively screwed to the core frame body 39 and the spacer member 40 are pivotally connected to each other, and the links 37, 38 associated with the rotation of the screw rod 32 are connected. The extension or contraction movement of the spacer member 40 is performed to fit the spacer member 40 to the core frame main body 39 and pull it up. In the figure, the state of the solid line shows the pulled-up state of the spacer member 40, and the state of the imaginary line shows the fitted state.

<Problems to be solved by the invention> However, in the above structure, there is a problem that the screws loosen due to the vibration applied at the time of placing the concrete, and therefore the screw rod 32
Has a problem that the screw part or the link is damaged quickly and the life of the device is short.

This invention has been made for the purpose of obtaining a spacer member lifting mechanism that solves the above problems. There is no fear of loosening due to vibration, and a stable and constant fitting force can be obtained during mold assembly. An object of the present invention is to obtain a spacer member lifting mechanism that can insert and remove the spacer member.

<< Means for Solving the Problems >> In order to solve the above problems, in the mechanism of the present invention, the toggle link 15 is used as a mechanism for operating the links 24, 25 that connect the form body 2 and the spacer member 5. I am using. In order to transmit the movement of the toggle link 15 to the links 24 and 25, one of the links 25 is connected to the rod 19 and the other 24 is connected to the sleeve 16 slidably fitted on the rod, and the toggle link 15 is connected to the rod 19. And sleeve 1
It is interposed between 6 and. That is, the toggle link 15 has its fulcrum 27 and action point 21 at the sleeve 16 and the rod 19.
One of the center members 22 is connected to the rod 19 and the other 18 is connected to the sleeve 16. Toggle link 15
Although the rod 19 or the sleeve 16 can be configured as one of the link elements, it is more preferable that the rod 19 or the sleeve 16 is configured by two independent link elements, that is, the swing link 26 and the rotary link 28. The handle 30 is fixedly or detachably attached to the toggle link 15.

<< Operation >> By rotating the handle 30 by 180 degrees, the sleeve 16 and the rod 19 are connected to the rotary link 2 of the toggle link 15.
The two center members 18 and 22 are moved toward and away from each other by a relative movement by a length twice the inter-pin distance of 8. By this approaching / separating operation, the links 24 and 25 are expanded or contracted similarly to those in FIG. 4, so that the spacer member 5 is fitted and pulled up.

The links 24 and 25 at the time of fitting are the link elements 2
4a, 24b, 25a, 25b are in a slightly V shape, and in this state, the outer surface of the spacer member 5 collides with the fitting edge of the end plate, and the pushing movement of the spacer member 5 is stopped. Therefore, even if one of the two links 24 and 25 expands quickly, the pushing movement of the link is stopped by the collision, and the other link continues to expand, so that the spacer member 5 is fitted into the mold body 2. To be dressed. During this mold assembly, the toggle link 15 is stopped by colliding with the stopper 26a at a position where the action point 21 thereof slightly exceeds the dead point, and the toggle link 15 is self-locked. Further, since the position of the toggle link 15 at the time of mold assembly is always constant, the links 24, 25
The degree of extension is constant, and the mold is neither excessively clamped nor loosened. To adjust the extension of the links 24 and 25,
For example, it is possible to provide the screw adjusting portion 23 at the connecting portion between the rod 19 and the center member 22.

<< Embodiment >> FIGS. 1 and 2 show the present invention applied to a core frame for forming an underdrain block. FIG. 1 is a central longitudinal sectional view of the core frame.
FIG. 2 is a view on arrow A in FIG. In the figure, 1 is a cylindrical core frame, 2 is a core frame body having a drawing space 3 in the axial direction of the core frame 1, 4 is a rubber sheet stretched in the drawing space 3, and 5 is a rubber sheet 4. A spacer member inserted on the back surface of the spacer, 6 a gap formed between the spacer member 5 and the aperture space 3, 7 a block material protruding from the upper surface of the spacer member 5, and 8 and 9 the core frame body. 2 is a reinforcing plate installed inside, 10 is a demolding machine insertion port provided in the reinforcing plate 8, 11 is a longitudinal member having a U-shaped cross section provided in the reinforcing plate 9, and 12 is suspended from the longitudinal member 11. The block member 13 is a narrowed portion formed between the reinforcing plates 8 and 9.

Reference numeral 15 is a toggle link as a whole, 16 is a sleeve connected to one end of the toggle link 15 by a pin 17, 18 is a center member integrally formed with the sleeve, and 19 is slidably fitted in the sleeve 16. With a rod, the tip of the connecting rod 20 fixed to the base end thereof and the other end of the toggle link 15 are connected by a pin 21. 22 is a center member fixed to the tip of the rod 19 with nuts 23, 23 so that the position of the block member is adjustable. 24, 25 are block members 7, 12 and the center member 1.
It is a link built between 8 and 22. The toggle link 15 is composed of a swing link 26 having a U-shaped cross section, and a rotary link 28 pivotally attached to the tip of the swing link by a pin 27. Reference numeral 29 denotes a protrusion protruding from the tip of the rotary link 28, reference numeral 30 denotes a handle fixed to a handle fixing protrusion 28a formed at the center of the rotary link 28, and reference numeral 31 denotes a block member 7 and a reinforcing plate 8. The diaphragm link squeezes the core main body 2 inward in association with the pulling up operation of the spacer member 5.

FIG. 3 is a cross-sectional plan view of the toggle link. FIG. 3A shows the state of the toggle link when the mold is assembled, that is, when the core frame 1 is fitted to the end plate, and FIG. 3B is the core frame. The state of the toggle link at the time of squeezing, that is, when the spacer member is pulled up is shown. In the figure (a), the action point 21 slightly exceeds the bottom dead center (a point on the extension of the straight line connecting the pin 17 and the pin 27), and the protrusion 28a of the rotary link is formed on the back plate 26a of the swing link. The rotary link 28 stops rotating due to the collision, the toggle link 15 is self-locked by the drag force received by the links 24 and 25, and the toggle link 15 does not loosen due to vibration applied during concrete pouring.
The spacer member 5 is not pressed too much. The figure 30 (b) shows the handle 30 rotated 180 degrees from the state shown in the figure (a), and the point of action 21 slightly exceeds the top dead center (the point on the straight line connecting the pin 17 and the pin 27). At the position, the convex portion 29 of the rotary link collides with the back plate 26a of the swing link to stop the rotary motion of the rotary link 28. The toggle link 15 is self-locked by the elastic recovery force of the narrowing portion 13 of the core frame to maintain the narrowed state, and can be easily released from the mold using a mold releasing machine.

In this embodiment, the rubber sheet 4 is stretched over the drawing space 3 so that the gap 6 can be formed between the spacer member 5 and the drawing space 3 even when the mold is assembled. The mold body can be immediately squeezed in synchronism with the pulling up operation of the mold, and it is not necessary to provide a play portion such as a long hole in the connecting portion of the squeeze link 31 unlike the conventional case, and the mold can be easily manufactured. As a result, the operation can be performed more reliably and smoothly.

<Effect of the Invention> As described above, according to the spacer member lifting mechanism of the present invention, the core frame can be maintained in the mold assembling state and the mold drawing state by the self-locking action of the toggle link. Even if vibration is applied during installation, the mold assembly does not loosen, and the position of the toggle link during mold assembly is always constant, so a stable and constant fitting force can always be obtained. Further, since the toggle link is easy to operate, the spacer member of the core frame can be inserted and removed in one operation.

[Brief description of drawings]

FIG. 1 is a central longitudinal cross-sectional view of a core frame for forming an underdrain block according to the present invention, FIG. 2 is a view of an arrow A in FIG. 1, FIG. 3 is a cross-sectional plan view of a toggle link, and FIG. It is a schematic diagram which shows the conventional lifting mechanism of a spacer member. In the figure, 1: core frame, 2: core frame body 5: spacer member, 15: toggle link 16: sleeve, 19: rod 21: pin (point of action), 24, 25: link 26: swing link, 27: Pin (fulcrum) 28: Rotating link, 30: Handle

Claims (2)

[Scope of utility model registration request] 1. A pull-up mechanism for a spacer member of a form for pulling up the spacer member (5) by activating links (24), (25) connected to the form body (2) and the spacer member (5). ,
One of the center members pivotally connecting the links (24) and (25)
(22) is connected to the rod (19) and the other (18) is connected to a sleeve (16) slidably fitted to the rod, and a toggle is provided between the rod (19) and the sleeve (16). A lifting mechanism for a spacer member of a formwork, characterized in that a link (15) is interposed. 2. The mechanism for lifting a spacer member of a mold according to claim 1, wherein the toggle link (15) is composed of a swing link (26) and a rotary link (28).