RU2385396C1 - Lock for attaching formwork elements - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: lock for attaching formwork elements includes stops with cylindrical cams installed with possibility of being moved relative to each other, gear rack, hinged joint and locking wedge freely arranged in transverse channel and equipped with fixing device on narrow end and anvil on wide end, in which the gear rack is equipped with "П"-shaped limit switch. In the latter there is hinged joint and slots on vertical walls to arrange the locking wedge. Slots are made perpendicular to longitudinal axis of gear rack, one stop with cylindrical cam is equipped with cantilever arm and installed with possibility of being turned about the axis of hinged joint under wedge impact. Length of wedge contact surface is chosen from the condition providing reliable levelling and gripping of formwork elements, the other stop with cylindrical cam is provided with internal cavity to arrange the gear rack, equipped with cogs on upper flange of cavity along internal surface and installed with possibility of being moved along gear rack and contacting its cogs. Working angle of wedge is taken equal to 3-5 degrees from self-braking condition, locking wedge has equal thickness throughout its length, lock parts are made with the method, e.g., of precision casting.

EFFECT: optimisation of loaded condition of the lock, enlarging operating capabilities, simplifying the design and increasing manufacturability, and reducing the cost of the product.

4 cl, 4 dwg

Description

The invention relates to the field of construction and can be used in the construction of monolithic reinforced concrete structures for connecting adjacent panels and other formwork elements.

A known lock for connecting formwork elements (see RU 44991 U1 dated 08/20/2004, class MKI 7 E04G 17/04), made in the form of a bracket, consisting of two articulated half-brackets, made with the possibility of movement relative to each other, in which holes are made to place a wedge.

A known connector for assembled formwork panels (see DE 3734390 C2, class MKI E04G 17/04 of 10.10.87), containing two legs with stops, equipped with bevels and having the possibility of relative movement from a wedge freely located in the grooves, this compression of the edge profiles is carried out on the side and lower walls of the profiles due to the interaction of the bevels of the legs and the castle depressions of the profiles and protrusions at the inner corners of the legs, interacting with the side walls of the profile.

The disadvantages of the known technical solutions are the limited use of them only for connecting the formwork panels in one size and ensuring the alignment of the boards and their clamping by linear movement of half-arms or paws with stops, which causes complex loading of the wedge with shearing, bending and twisting forces, as well as force only on one surface of the castle depressions of the shield profile.

A known lock for connecting formwork shields (see RU 52897 U1 dated 04/27/2006, class IPC E04G 17/00) containing clamping jaws mounted with the possibility of movement relative to each other, a gear rack and a pressure wedge located perpendicular to the gear rack.

The disadvantages of the known technical solution are to ensure alignment of the shields and their clamping by linear movement of half-arms or paws with stops, which causes complex loading of the wedge with shear, bending and twisting forces, as well as the force acting on only one surface of the castle depressions of the shield profile and the complexity of the design and manufacture.

The closest technical solution to the claimed object analogue (prototype) is a lock for connecting formwork elements (see RU 2267587 C1 of 01/10/2006, class MKI 7 E04G 17/07), containing L-shaped stops and an arcuate wedge, placed in transverse grooves in the form of annular segments located circumferentially with a center on the axis of the swivel.

The disadvantages of the known technical solutions are their limited use only for connecting formwork panels of the same size, great efforts in a wedge connection due to the difference in the shoulder forces in the wedge and on the stops, as well as the complexity of the design and manufacture of the wedge connection.

The tasks to which the invention is directed is to create a lock in which these drawbacks are eliminated, namely, optimization of the difficult-stressed state of the joint, expansion of operational capabilities, simplification of the design and, as a consequence, its manufacture.

These problems are solved according to the invention in the lock for connecting the formwork elements, which contains stops with cylindrical cams, mounted for movement relative to each other, a gear rack, a swivel joint and a locking wedge, freely placed in the transverse channel and equipped with a latch on the narrow end and anvil on the wide the end, in which the gear rack is equipped with a U-shaped end, in which a swivel and grooves are made on the vertical walls to accommodate the locking wedge, while the grooves made perpendicular to the longitudinal axis of the gear rack, one emphasis with a cylindrical cam is provided with a cantilever arm and mounted to rotate relative to the axis of the articulated joint from the wedge effect, while the length of the wedge contact surface is selected to ensure reliable alignment and clamping of the formwork elements, another emphasis with a cylindrical cam made with an internal cavity to accommodate the rack, provided with teeth on the upper shelf of the cavity on the inner surface and installed with the possibility of movement along the gear rack and contact with its teeth, while the working angle of the wedge is chosen equal to 3-5 degrees from the condition of self-braking, the locking wedge has the same thickness along the entire length, the details of the lock are made by, for example, precision casting.

The essence of the invention lies in the fact that the supply of the gear rack with a U-shaped trailer, in which there is a swivel and grooves on the vertical walls to accommodate the locking wedge, while the grooves are made perpendicular to the longitudinal axis of the gear rack, makes it possible to install a stop with a cylindrical cam equipped with a cantilever a lever with the possibility of rotation relative to the axis of the swivel from the action of the locking wedge on the cantilever lever when moving the locking wedge in the grooves of the U-shaped trailer and perpendicular to the longitudinal axis of the gear rack, thereby aligning and clamping the formwork elements to another stop with a cylindrical cam made with an internal cavity to accommodate the gear rack, equipped with teeth on the upper shelf of the cavity along the inner surface and pre-set to the desired size to ensure contact with teeth of the rack, preventing the movement of this emphasis when jamming the lock and providing adjustment of the lock to the desired size of the connected elements in proportion to the pitch teeth serving as supporting elements for the moveable support, while the length of the wedge contact surface is selected from the condition of ensuring reliable alignment and clamping of the formwork elements, and the working angle of the wedge is chosen equal to 3-5 degrees from the condition of self-braking. The design of the castle parts allows the use of high-tech manufacturing techniques, such as precision casting.

The applicant does not know the design of the lock for connecting the formwork elements, which are inherent in the essential features specified in the independent claim, which confirms the compliance of the claimed invention with the patentability criteria of “novelty” and “inventive step”.

The invention is illustrated by drawings, in which Fig. 1 is a general view of the lock, Fig. 2 is a projection general view of the lock, Fig. 3 is a section AA of Fig. 2, and Fig. 4 is a general view of the lock in the closed position.

The lock for connecting the formwork elements includes stops 1 and 2 with cylindrical cams 3, a gear rack 4 and a locking wedge 5, equipped with a latch 6 at the narrow end and anvil 7 at the wide end. The gear rack 4 is equipped with a U-shaped end 8, in which a swivel 9 and grooves 10 are made on the vertical walls 11 of the end 8 to accommodate the locking wedge 5, while the grooves 10 are made perpendicular to the longitudinal axis 12 of the gear rack 4. The stop 1 is equipped with a cantilever lever 13 and mounted on the end 8 with the possibility of rotation relative to the axis of the swivel 9. The stop 2 is made with an internal cavity 14 to accommodate the rack 4, provided with teeth 15 on the upper shelf of the cavity on the inner surface. The working angle 16 of the wedge 5 is chosen equal to 3-5 degrees from the condition of self-braking.

The lock for connecting the elements of the formwork works as follows. The lock is pushed onto the pre-oriented profiles in the open position, the emphasis 2 is moved manually until the elements of the formwork 17 are preliminarily covered and put into engagement with the teeth of the rack 4. Then, by striking the anvil 7, the wedge 5 is hammered, thereby affecting the cantilever lever 13 of the stop 1, thereby turning the cylindrical cams 3, and, pressing against each other the elements of the formwork 17, carry out their clamping. The castle is removed by the reverse movement of the locking wedge 5.

The technical result when using the invention is to optimize the loaded state of the lock, expanding operational capabilities, simplifying the design and improving manufacturability, as a result, reducing the cost of the product.

Claims (4)

1. A lock for connecting the formwork elements, comprising stops with cylindrical cams, mounted to move relative to each other, a gear rack, a swivel and a locking wedge freely placed in the transverse channel and provided with a latch on the narrow end and the hard place on the wide end, characterized in that the gear rack is equipped with a U-shaped trailer, in which a swivel and grooves are made on the vertical walls to accommodate the locking wedge, while the grooves are made perpendicular to the the axial axis of the gear rack, one emphasis with a cylindrical cam is equipped with a cantilever arm and is mounted to rotate relative to the axis of the swivel from wedge action, while the length of the wedge contact surface is selected to ensure reliable alignment and clamping of the formwork elements, the other emphasis with a cylindrical cam is made with internal cavity to accommodate the rack, equipped with teeth on the upper shelf of the cavity on the inner surface and installed with the ability to move along the tooth that rail and contact with its teeth. 2. The lock for connecting the formwork elements according to claim 1, characterized in that the working angle of the wedge is chosen equal to 3-5 ° from the condition of self-braking. 3. The lock for connecting the formwork elements according to claim 1, characterized in that the locking wedge has the same thickness along the entire length. 4. The lock for connecting the formwork elements according to claim 1, characterized in that the details of the lock are made by the method of, for example, precision casting.

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