[0001] This document describes a claw for crosspiece to be used in the crosspiece setting
in mobile working towers made of pre-fabricated elements (modular system).
[0002] Generally, the various crosspiece setting systems existing in the market that are
used in mobile working towers, are composed by simple rabbet elements and by setting
cramps. Therefore, when a working tower is assembled with a certain composition and
configuration in a certain local, and that it needs reconfiguration; local alteration
or give other functionality to the tower, the dissemble option and the new assembly
is considered a problem by the time and the involved ways.
[0003] In the crosspiece setting systems, there are two predominance types of settings:
- (a) Simple rabbet elements, with the use of wedges or brakes.
- (b) Crosspiece setting systems to the working tower elements, with the use of cramps
or direct screwing.
- (c) Mixed systems that use the two anterior methods simultaneously or with similar
adaptations.
[0004] The simple rabbet systems (a) are easy to assemble, can be slightly trusted, work
only by pressure rabbet, but can be freed easily by accidental actions or by verified
movements/vibrations in the towers during the works.
[0005] The setting methods referred in (b) and (c), of the anterior paragraph, have as main
inconvenience the assembly and dissemble problem, which is complicated and delayed,
because, besides the cramps, wedges or rods, it is necessary other accessories for
the assembly, such as (screws, nuts, etc.), which also involves using squeezing and
relief tools. The assembly and dissemble of these towers have inevitable man power
costs associated to the necessity of assembly/dissemble other braking elements.
[0006] This new claw for crosspiece that is now presented, resolves totally all the anterior
referred problems, because since its elements were technically studied, with optimised
configuration and functioning, it allows an easy, rapid, resistant and safe assembly,
dismount and reconfiguration of the mobile working towers made of pre-fabricated elements,
easily adapted to modular systems.
[0007] This claw for crosspiece is introduced in the extremities of the crosspiece and fixed
with a rivet, all being part of the crosspiece set, including the profile and the
claws.
The geometric configuration of the Claw body for the Crosspiece is easily adapted
to be equal to the profile periphery used in the crosspiece and in the mobile working
towers elements build with pre-fabricated elements. The following profiles are dependent
of the used geometrical configuration:
- (a) The expanded extension (4) with the structural periphery adapted to the crosspiece
profile interior configuration is rebated at the extremity and braked with a rivet
(14 fig. 2). This claw has an angle of nearly 45º to apply in the crosspiece brake
but, with the changing of the angle for 90º, there it be applied in the braking horizontal
crosspiece of the mobile towers structure.
- (b) The claw interior area (16 fig. 4) will have a contour equivalent to the profile
(13 fig. 4) used in the element to which it adjusts with compatible tolerance.
- (c) The auto-positioning bolt (1) holding the claw body, enters the profile interior
used as an element step, guides & supports the claw.
[0008] The setting of the claw presents characteristics for the working towers installation
placed outside, exposed to the environment conditions (atmospheric agents, polluting
agents, etc.).
[0009] Any of latch elements will only be set in motion (locked/unlocked) by mechanical
movements of the safety elements that constitute this setting claw.
[0010] The claw for the crosspiece presents itself with two differentiated safety elements,
the Automotive Mobile Element (3) and the Safety Latch (2). Both were studied with
the main purpose to restrict unnecessary access, to control and to prevent accidental
actions in the structure crosspiece setting system. Only the movements of these two
elements permit alternating between the "open" positions, for the assembly, and the
"close" positions, for situations of concluded assembly. The opening of the automotive
latch system (3) is influenced by two buttons simultaneously (5). With simple and
rapid actions and without the use of complementary accessories, the crosspiece is
assembled in the structure and fixed with high security.
[0011] The Mobile Automotive Element (3) moves in rotation around an axle (6); the buttons
(5) are fixed by an elastic peg (7 fig. 6) and the cradle for the spring (8 fig. 6)
has as main function the movement that blocks and unblocks, allowing the open and
close positions.
[0012] The Safety Latch (2 fig. 6) comprises a spring (10 fig. 6) and a guide bolt (11)
that helps the element to maintain its opening and closing positions. This Security
lock is fixed by forging elements, since the ring function (9) and the bearing function
(12) permits forging the Latch without its immobilization, in other words, they permit
the rotation movements.
[0013] With the main purpose to understand more easily not only its composition but also
the use of this invention, a brief functioning description will be followed, through
an assembly example and drawings references. Image 3 - front sight lateral vertical
projection, image 4 - steps sight horizontal projection (15) and element profile cut
(13) before the claw junction, supposedly applied in the crosspiece extremity (not
visible in the drawing) but would be rabbet in the extension (4) of the claw body,
being this a mere example and never limited, where:
1º) Press simultaneously both buttons (5 figs 1 and 2) in order to open the automatic
security mobile element (3 figs 1 and 3).
2º) Line up the auto-positioning Claw bolt (1 figs1 and 4) along with the perforated
step (15 fig. 4) of the element (13).
3º) Displace the Claw in the direction of the step hole (15 fig. 4). When arriving
to the final position, the automatism closes the mobile element (3) and the Claw stays
automatically fixed.
4º) Rotate the safety latch (2 fig. 5) in front of the element profile (13), closing
position, which compels to a perfect coupling of the element profile (13 fig. 5) in
the claw interior area.
5º) To remove the Claw:
- Rotate the safety lock (2 fig. 3) in order stay away from the element profile (13);
- Press simultaneously the buttons (5) to open the automatic security system and pull
the claw.
Nomenclature
[0014]
- 1-
- Auto-positioning bolt that will rabbet in the element step
- 2-
- Complementary safety latch
- 3-
- Mobile element of the automatic safety latch
- 4-
- Structural claw extension to apply in the crosspiece
- 5-
- Pressure buttons synchronized for automatic opening
- 6-
- Axle of the automatic security components
- 7-
- Elastic peg
- 8-
- Cradle for the mobile element spring
- 9-
- Ring
- 10-
- Spring for automatic safety latch
- 11-
- Guide bolt for safety latch
- 12-
- Bearing
- 13-
- Element Profile
- 14-
- Location of the linking rivet application and joined claw to the crosspiece
- 15-
- Element profile of the step
- 16-
- Periphery contour of the claw interior