US3632075A - Dismantling keybolt for a propping-up and supporting framework - Google Patents
Dismantling keybolt for a propping-up and supporting framework Download PDFInfo
- Publication number
- US3632075A US3632075A US12397A US3632075DA US3632075A US 3632075 A US3632075 A US 3632075A US 12397 A US12397 A US 12397A US 3632075D A US3632075D A US 3632075DA US 3632075 A US3632075 A US 3632075A
- Authority
- US
- United States
- Prior art keywords
- leg
- arms
- keybolt
- bracket
- framework
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G25/00—Shores or struts; Chocks
- E04G25/04—Shores or struts; Chocks telescopic
- E04G25/06—Shores or struts; Chocks telescopic with parts held together by positive means
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G25/00—Shores or struts; Chocks
- E04G25/04—Shores or struts; Chocks telescopic
- E04G25/06—Shores or struts; Chocks telescopic with parts held together by positive means
- E04G25/061—Shores or struts; Chocks telescopic with parts held together by positive means by pins
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G25/00—Shores or struts; Chocks
- E04G25/04—Shores or struts; Chocks telescopic
- E04G25/06—Shores or struts; Chocks telescopic with parts held together by positive means
- E04G25/061—Shores or struts; Chocks telescopic with parts held together by positive means by pins
- E04G25/063—Shores or struts; Chocks telescopic with parts held together by positive means by pins with safety devices to avoid the accidental loss or unlocking of the pin, e.g. chains attaching the pin to the prop
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G25/00—Shores or struts; Chocks
- E04G25/04—Shores or struts; Chocks telescopic
- E04G25/06—Shores or struts; Chocks telescopic with parts held together by positive means
- E04G25/068—Shores or struts; Chocks telescopic with parts held together by positive means by a cam
Definitions
- the frameworks are raised, for instance, by means of telescopic legs, up to an approximate height, then the screwjacks are regulated for suitably adjusting the position of the form.
- the present invention overcomes these various disadvantages by creating a keybolt enabling the height of a framework to be sufiiciently reduced by a simple and speedy operation carried out within easy human reach.
- the keybolt slipped transversally between a lower clamp of the vertical upright of a framework and a transversal pin engaged in an axially adjustable manner in a telescopic leg slidably mounted inside said upright, is formed by a U-shaped stirrup-piece comprising a semicylindrical core connecting two rigid parallel arms or wings each comprising a horizontal rectilinear edge cooperating with said clamp and a sloping edge converging towards said rectilinear edge to form a ramp cooperating with the removable pin traversing the telescopic leg.
- FIG. 1 is an elevation of a building and maintaining framework device fitted with a keybolt according to the invention
- FIG. 2 is a partial side elevation showing, on a larger scale, the keybolt, and
- FIG. 3 is a section taken substantially along the line IIIIII of FIG. 2.
- FIG. I shows the applying of the keybolt, according to the invention, to a framework 1 shown, by way of example, in the form of a fixed scaffolding.
- This fixed scaffolding consists of a certain number of building members 2 and respectively formed by three tubes 3, 4 and 5 mutually assembled at one of their ends for extending in three planes, perpendicularly to one another. The holding of these tubes in their right angular relation is effected by angle-braces 6.
- the building elements 2, eight in number for instance, are mutually assembled at the free ends of their tubes 3, 4 and 5 to form a rigid framework of parallelipipedic shape comprising four vertical tubular uprights 3.
- the fixed scaffolding thus made is completed by positioning, at the bottom ends of the four vertical uprights, of runway members 7, preferably removable, of telescopic legs 8, and at the top ends of said uprights of supporting members 9.
- the runway members 7 can be made by external or internal rollers whose spindles are mounted in bearings made level with the lower ends ofthe uprights 3.
- Each telescopic leg 8 includes a tube sliding on a corresponding vertical upright which is provided with a retaining member ensuring the axial locking of said tube in maximum penetration when the fixed scaffolding rests on the runway members.
- Each leg 8 has a series of transversal holes 8; FIG.
- Each supporting member 9 comprises a sleeve 12 fixed to the top part of the corresponding vertical tubular upright.
- the sleeve 12 is tapped for accommodating a threaded rod 13 whose top end is able to revolve on a catch 14 made integral with the core of a stirrup-piece I5 whose arms 16 rise vertically.
- the four stirrup-pieces 15 are oriented in pairs for supporting two parallel girders 17 on which the horizontal table 18 rests.
- Said table can be made in any suitable manner, particularly of sections 19 for holding shuttering or mold form 20 for making a horizontal construction or a levelling flooring-slab 21.
- jacks 22 hydraulic for instance, are adapted on the bottom terminal parts of the tubular uprights, so that their rods 23 cooperate with shoes 24 able to be axially locked, in an adjustable manner, on the telescopic legs 8.
- a supply of fluid under pressure is controlled for causing the rods 23 to extend so that said rods by bearing on the shoe 24, ensure the raising of the fixed scaffolding by extension of the telescopic legs 8.
- the pins 11 are engaged in the telescopic legs 8 for forming abutments on which the vertical tubular uprights bear.
- the support members 9 are then adjusted by means of threaded rods 13 for imparting to the table the seating corresponding to the construction work 21 to be carried out.
- the operations for putting into effect, such as those described above, also comprise the fitting of the keybolt, according to the invention, between the pin 11 and clamp 25 integral with the corresponding bottom end of the vertical tubular upright of each telescopic leg 8.
- the keybolt is formed by a U- shaped stirrup-piece 26 or bracket comprising a semicylindrical core or light portion 27 whose internal radius substantially corresponds to that of the telescopic legs 8.
- the core 27 connects two parallel rigid arms or wings 28 whose length is greater that the diameter of the legs 8.
- the arms 28 have aligned holes 29a, 29b, 290, provided for receiving a locking pin 30 having a handle 31 secured to a chain or other flexible connection 32 with one of the arms or wings 28.
- Each arm 28 has a rectilinear course 33, extending in the transversal plane defining one of the edges of the semicylindrical core or light 27, and a second course 34 sloped in a converging manner towards the course 33 and intercepting the second transversal plane defining the other edge of the semicylindrical core 27, but beyond the imaginary diametral plane of said core.
- the course 34 is made as a function of the length of the arms or wings 28 so as to have a same relatively slight slope and make ramps for cooperating with the terminal parts of the pin 11 projecting on either side of the telescopic leg 8.
- each keybolt is inserted between the clamps 25 to rest by their ramps 34 on the pins 11 previously engaged in the corresponding holes of the telescopic legs 8.
- the engaging of each keybolt is done so that the core 27 is appreciably applied against the corresponding peripheral surface of the telescopic leg 8.
- the transversal locking of each keybolt is then assured by positioning the locking pin 30 in the holes 29a made in the arms or wings 28 for limiting, with the interior peripheral surface of the core 27, a passage section sufficient for the telescopic leg 8.
- the keybolts 26 In this position, in which the pins 11 cooperate with the beginning part of the sloped ramps 34, the keybolts 26 cannot be subjected to any accidental transversal or axial displacement and, consequently, occupy a definite position which enables the supply to thejacks 22 to be reversed so as to make the framework 1 rest by the clamps 25 on the keybolts 26 bearing on the terminal parts of the pins 11.
- each keybolt 26 is then moved in the direction of the arrow f by repeated blows given level with the terminal parts of the arms or Wings 18.
- the transversal sliding of each keybolt 26 is easily done between the clamp 25 and the pin 11 owing to the presence of the ramps 34 whose slope is chosen for preventing a sudden unexpected disengaging.
- each keybolt is normally carried out up to the moment when the locking keybolt 30, engaged in the holes 2911, is brought into contact with the telescopic leg 8.
- the locking pins 30 also form safety members opposing any risk of complete disengagement, which might have the effect of subjecting the framework to an abrupt fall on to the pins 1 1.
- the first transversal sliding stage of each pin can be followed by an identical stage by disengaging the locking pin 30 from the holes 29b for reintroduction in the holes 29c.
- the jacks 22 are supplied with pressure fluid for extending piston rods 23 raising the framework to an extent just sufficient for relieving the various pins 11 which can thus be disengaged from the telescopic legs 8.
- the complete lowering of the propping-up framework is then controlled by means of the jacks 22, contingently combined with the progressive displacement of the pins 11 in relation to the telescopic legs 8, in the case where it is necessary to provide safety elements capable of avoiding failures of jacks 22.
- a keybolt for propping a vertically extensible framework and enabling selective lowering thereof for dismantling thereof comprising a rigid U-shaped bracket for straddling a lower leg of the framework and supported by a pin in said leg to constitute a stirrup for supporting an upper leg telescoped on the lower leg, said bracket including a bight portion connecting two parallel arms each having a horizontal rectilinear upper edge and a lower edge inclined upwardly from said bight portion toward the upper edge, said upper edges constituting the support stirrup and said lower edges constituting a ramp engageable with the supporting pin for lowering said stirrup when the bracket is moved transversely of the leg and means spanning said arms to limit transverse movement of the bracket.
- a keybolt according to claim 2 wherein said arms are of a length substantially greater than the transverse dimensions of the framework leg to be straddled, said arms having a plurality of said pairs of aligned holes spaced longitudinally of said arms whereby said retainer may be removably inserted selectively in a pair of holes to retain said bracket in full supporting position or permit limited transverse movement of said bracket relative to the leg to enable an incremental lowering of said stirrup as the ramp edges slide on the leg supported pin.
- a keybolt according to claim 2 comprising a flexible connector securing said retainer to said bracket.
- a keybolt according to claim 1 wherein said bight portion is semicircular and has an internal radius substantially equal to the radius of the framework leg.
- a keybolt according to claim 1 wherein said bight portion is semicylindrical with the ends thereof contiguous with said arms at a diametrically disposed plane, said inclined lower edges of said arms intersecting the lower edge of said bight portion beyond said plane.
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Forms Removed On Construction Sites Or Auxiliary Members Thereof (AREA)
Abstract
A keybolt for lowering a mold form supporting frame comprises a U-shaped bracket including a semicylindrical bight portion connecting two rigid parallel arms, each comprising a horizontal rectilinear edge constituting a stirrup for supporting an upper telescopic member and a lower edge upwardly inclined from the bight toward the horizontal edge and constituting a ramp for bearing on a pin removably supported by the frame, means spanning said arms to limit transversal movement of the bracket to selectively lower the frame by limited increments.
Description
I United States Patent 1 1 3,632,075
[72] Inventor Enrique Munoz [56] References Cited a n UNITED STATES PATENTS P 1,552,912 9/1925 c011 254/104 [22] Filed Feb. 18, 1970 451 Patented Jan. 4, 1972 FOREIGN f T [73] Assignee Entreprlses Devars Naudo 8; Cie 342,876 2/1931 Great Brltam 248/354 P Paris, France 584,220 1/1947 Great Britain... 248/354 R Pmmy 3533 Primary Examiner-William 11. Schultz t 6910104 A! omey 1m1ne & Sm1ley s41 DISMANTLING KEYBOLT FOR A PROPPING-UP gg gg f gal zz3:222?.2 1: f m f AND SUPPORTING FRAMEWORK P P a 7 CM 3D in Fl cal blght portion connecting two ng d parallel arms, each [52] U S C'l raw g 248/354 P tcomprisinlgfa horizontal rectilinear edge tcjmstitjuting a stiraup or suppo 1ng an upper e escop1c mem r an a ower e go 254/ 104 upwardly inclined from the bight toward the horizontal edge [51] Int. Cl B61111/02 and constituting a ramp for bearing on a pin removably sup- [50] Field of Search 248/351, ported by the frame, means spanning said arms to limit trans- 354 R, 354 P, 354 S; 254/1 1, 104; 182/179 versal movement of the bracket to selectively lower the frame by limited increments.
PATENTEDJAN M972 SHEET 1 OF 2 FIGA //v wi '0 PATENTEB JAN 4 B72 SHEET 2 OF 2 DISMANTLING KEYBOLT FOR A PROPPING-UP AND SUPPORTING FRAMEWORK BACKGROUND OF THE INVENTION For making levelling flooring-slabs or other appreciably horizontal constructions, recourse is generally had to a framework of which at least the top part is provided with axially adjustable members, such as screwjacks, for supporting a mold form.
When the form is put into position, the frameworks are raised, for instance, by means of telescopic legs, up to an approximate height, then the screwjacks are regulated for suitably adjusting the position of the form.
To dismantle the construction it is necessary to reduce the height of the framework to a certain extent, so as then to be able to carry out a partial raising, particularly by means of hydraulic jacks, which enable the disengaging and withdrawing of telescopic legs, then the lowering of the framework. To carry out such operation, most frequently one acts on upper screwjacks, so as to lower the table in relation to the construction made. This operation is carried out by hand, so that the workmen are obliged to work at the top part of the framework, which entails considerable physical strain as well as the risking of more or less serious accidents owing to falling. Furthermore, when the top screwjack gets out of order, the positioning originally imparted to the form is altered and must then be readjusted.
SUMMARY OF THE INVENTION The present invention overcomes these various disadvantages by creating a keybolt enabling the height of a framework to be sufiiciently reduced by a simple and speedy operation carried out within easy human reach.
According to the invention, the keybolt, slipped transversally between a lower clamp of the vertical upright of a framework and a transversal pin engaged in an axially adjustable manner in a telescopic leg slidably mounted inside said upright, is formed by a U-shaped stirrup-piece comprising a semicylindrical core connecting two rigid parallel arms or wings each comprising a horizontal rectilinear edge cooperating with said clamp and a sloping edge converging towards said rectilinear edge to form a ramp cooperating with the removable pin traversing the telescopic leg.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an elevation of a building and maintaining framework device fitted with a keybolt according to the invention;
FIG. 2 is a partial side elevation showing, on a larger scale, the keybolt, and
FIG. 3 is a section taken substantially along the line IIIIII of FIG. 2.
DETAILED DESCRIPTION OF THE INVENTION FIG. I shows the applying of the keybolt, according to the invention, to a framework 1 shown, by way of example, in the form of a fixed scaffolding. This fixed scaffolding consists of a certain number of building members 2 and respectively formed by three tubes 3, 4 and 5 mutually assembled at one of their ends for extending in three planes, perpendicularly to one another. The holding of these tubes in their right angular relation is effected by angle-braces 6. The building elements 2, eight in number for instance, are mutually assembled at the free ends of their tubes 3, 4 and 5 to form a rigid framework of parallelipipedic shape comprising four vertical tubular uprights 3.
The fixed scaffolding thus made is completed by positioning, at the bottom ends of the four vertical uprights, of runway members 7, preferably removable, of telescopic legs 8, and at the top ends of said uprights of supporting members 9. The runway members 7 can be made by external or internal rollers whose spindles are mounted in bearings made level with the lower ends ofthe uprights 3. Each telescopic leg 8 includes a tube sliding on a corresponding vertical upright which is provided with a retaining member ensuring the axial locking of said tube in maximum penetration when the fixed scaffolding rests on the runway members. Each leg 8 has a series of transversal holes 8; FIG. 3, for receiving a pin 11, forming an adjustable abutment on which the corresponding end of the vertical tubular upright bears when the fixed scaffolding is placed in elevation in relation to the ground. Each supporting member 9 comprises a sleeve 12 fixed to the top part of the corresponding vertical tubular upright. The sleeve 12 is tapped for accommodating a threaded rod 13 whose top end is able to revolve on a catch 14 made integral with the core of a stirrup-piece I5 whose arms 16 rise vertically. The four stirrup-pieces 15 are oriented in pairs for supporting two parallel girders 17 on which the horizontal table 18 rests. Said table can be made in any suitable manner, particularly of sections 19 for holding shuttering or mold form 20 for making a horizontal construction or a levelling flooring-slab 21.
To operate the fixed scaffolding described above and raise the shuttering or mold form 20 up to the height corresponding to the building 21 to be effected, various methods can be put into operation. Generally, jacks 22, hydraulic for instance, are adapted on the bottom terminal parts of the tubular uprights, so that their rods 23 cooperate with shoes 24 able to be axially locked, in an adjustable manner, on the telescopic legs 8. After positioning the various jacks 22, a supply of fluid under pressure is controlled for causing the rods 23 to extend so that said rods by bearing on the shoe 24, ensure the raising of the fixed scaffolding by extension of the telescopic legs 8. When the approximate height is reached, the pins 11 are engaged in the telescopic legs 8 for forming abutments on which the vertical tubular uprights bear. The support members 9 are then adjusted by means of threaded rods 13 for imparting to the table the seating corresponding to the construction work 21 to be carried out. The operations for putting into effect, such as those described above, also comprise the fitting of the keybolt, according to the invention, between the pin 11 and clamp 25 integral with the corresponding bottom end of the vertical tubular upright of each telescopic leg 8.
According to FIGS. 2 and 3, the keybolt is formed by a U- shaped stirrup-piece 26 or bracket comprising a semicylindrical core or light portion 27 whose internal radius substantially corresponds to that of the telescopic legs 8. The core 27 connects two parallel rigid arms or wings 28 whose length is greater that the diameter of the legs 8. The arms 28 have aligned holes 29a, 29b, 290, provided for receiving a locking pin 30 having a handle 31 secured to a chain or other flexible connection 32 with one of the arms or wings 28.
Each arm 28 has a rectilinear course 33, extending in the transversal plane defining one of the edges of the semicylindrical core or light 27, and a second course 34 sloped in a converging manner towards the course 33 and intercepting the second transversal plane defining the other edge of the semicylindrical core 27, but beyond the imaginary diametral plane of said core. The course 34 is made as a function of the length of the arms or wings 28 so as to have a same relatively slight slope and make ramps for cooperating with the terminal parts of the pin 11 projecting on either side of the telescopic leg 8.
After raising the framework 1 by means of the jacks 22, the various keybolts are inserted between the clamps 25 to rest by their ramps 34 on the pins 11 previously engaged in the corresponding holes of the telescopic legs 8. The engaging of each keybolt is done so that the core 27 is appreciably applied against the corresponding peripheral surface of the telescopic leg 8. The transversal locking of each keybolt is then assured by positioning the locking pin 30 in the holes 29a made in the arms or wings 28 for limiting, with the interior peripheral surface of the core 27, a passage section sufficient for the telescopic leg 8. In this position, in which the pins 11 cooperate with the beginning part of the sloped ramps 34, the keybolts 26 cannot be subjected to any accidental transversal or axial displacement and, consequently, occupy a definite position which enables the supply to thejacks 22 to be reversed so as to make the framework 1 rest by the clamps 25 on the keybolts 26 bearing on the terminal parts of the pins 11.
When it is necessary to proceed to dismantle the building ef fected, the workmen in charge of this operation disengage the locking pins 30 of the keybolts 26 from the holes 29a then put them back again in the holes 2%. Each keybolt 26 is then moved in the direction of the arrow f by repeated blows given level with the terminal parts of the arms or Wings 18. The transversal sliding of each keybolt 26 is easily done between the clamp 25 and the pin 11 owing to the presence of the ramps 34 whose slope is chosen for preventing a sudden unexpected disengaging. As the keybolts 26 are progressively withdrawn, the sloped ramps 34 cause the progressive lowering of the framework which is thus subjected to a slight downward vertical displacement for the removal, without sudden movement, of the mold form 20 of the building 21. The transversal displacement of each keybolt is normally carried out up to the moment when the locking keybolt 30, engaged in the holes 2911, is brought into contact with the telescopic leg 8.
in addition to the abutment function limiting the amplitude of the transverse] sliding of the keybolts 26 during dismantling, it should be noticed that the locking pins 30 also form safety members opposing any risk of complete disengagement, which might have the effect of subjecting the framework to an abrupt fall on to the pins 1 1.
According to the applications, the first transversal sliding stage of each pin can be followed by an identical stage by disengaging the locking pin 30 from the holes 29b for reintroduction in the holes 29c. This gives the benefit of an additional transversal sliding amplitude enabling a more considerable lowering vertical movement of the framework.
When the transversal displacement of the various keybolts is done, the jacks 22 are supplied with pressure fluid for extending piston rods 23 raising the framework to an extent just sufficient for relieving the various pins 11 which can thus be disengaged from the telescopic legs 8. The complete lowering of the propping-up framework is then controlled by means of the jacks 22, contingently combined with the progressive displacement of the pins 11 in relation to the telescopic legs 8, in the case where it is necessary to provide safety elements capable of avoiding failures of jacks 22.
As can be seen from the foregoing, the complete lowering of the framework is thus obtained without disturbing the seating of the mold form support and solely by means of simple operations carried out without danger at a height within easy human reach.
lclaim:
1. A keybolt for propping a vertically extensible framework and enabling selective lowering thereof for dismantling thereof, comprising a rigid U-shaped bracket for straddling a lower leg of the framework and supported by a pin in said leg to constitute a stirrup for supporting an upper leg telescoped on the lower leg, said bracket including a bight portion connecting two parallel arms each having a horizontal rectilinear upper edge and a lower edge inclined upwardly from said bight portion toward the upper edge, said upper edges constituting the support stirrup and said lower edges constituting a ramp engageable with the supporting pin for lowering said stirrup when the bracket is moved transversely of the leg and means spanning said arms to limit transverse movement of the bracket.
2. A keybolt according to claim 1 wherein said arms are of a length substantially greater than the transverse dimensions of the framework leg to be straddled, said means comprising a pair of aligned holes in said arms, said holes being spaced from said bight portion a distance substantially equal to the transverse dimensions of the leg and a retainer removably inserted in said pair of holes to retain said bracket in full supporting position or permit transverse movement of said bracket rela tive to the leg to enable lowering of said stirrup as the ramp edges slide on the leg supported pin.
. A keybolt according to claim 2 wherein said arms are of a length substantially greater than the transverse dimensions of the framework leg to be straddled, said arms having a plurality of said pairs of aligned holes spaced longitudinally of said arms whereby said retainer may be removably inserted selectively in a pair of holes to retain said bracket in full supporting position or permit limited transverse movement of said bracket relative to the leg to enable an incremental lowering of said stirrup as the ramp edges slide on the leg supported pin.
4. A keybolt according to claim 3 wherein there are three of said pairs of holes.
5. A keybolt according to claim 2 comprising a flexible connector securing said retainer to said bracket.
6. A keybolt according to claim 1 wherein said bight portion is semicircular and has an internal radius substantially equal to the radius of the framework leg.
7. A keybolt according to claim 1 wherein said bight portion is semicylindrical with the ends thereof contiguous with said arms at a diametrically disposed plane, said inclined lower edges of said arms intersecting the lower edge of said bight portion beyond said plane.
Claims (7)
1. A keybolt for propping a vertically extensible framework and enabling selective lowering thereof for dismantling thereof, comprisiNg a rigid U-shaped bracket for straddling a lower leg of the framework and supported by a pin in said leg to constitute a stirrup for supporting an upper leg telescoped on the lower leg, said bracket including a bight portion connecting two parallel arms each having a horizontal rectilinear upper edge and a lower edge inclined upwardly from said bight portion toward the upper edge, said upper edges constituting the support stirrup and said lower edges constituting a ramp engageable with the supporting pin for lowering said stirrup when the bracket is moved transversely of the leg and means spanning said arms to limit transverse movement of the bracket.
2. A keybolt according to claim 1 wherein said arms are of a length substantially greater than the transverse dimensions of the framework leg to be straddled, said means comprising a pair of aligned holes in said arms, said holes being spaced from said bight portion a distance substantially equal to the transverse dimensions of the leg and a retainer removably inserted in said pair of holes to retain said bracket in full supporting position or permit transverse movement of said bracket relative to the leg to enable lowering of said stirrup as the ramp edges slide on the leg supported pin.
3. A keybolt according to claim 2 wherein said arms are of a length substantially greater than the transverse dimensions of the framework leg to be straddled, said arms having a plurality of said pairs of aligned holes spaced longitudinally of said arms whereby said retainer may be removably inserted selectively in a pair of holes to retain said bracket in full supporting position or permit limited transverse movement of said bracket relative to the leg to enable an incremental lowering of said stirrup as the ramp edges slide on the leg supported pin.
4. A keybolt according to claim 3 wherein there are three of said pairs of holes.
5. A keybolt according to claim 2 comprising a flexible connector securing said retainer to said bracket.
6. A keybolt according to claim 1 wherein said bight portion is semicircular and has an internal radius substantially equal to the radius of the framework leg.
7. A keybolt according to claim 1 wherein said bight portion is semicylindrical with the ends thereof contiguous with said arms at a diametrically disposed plane, said inclined lower edges of said arms intersecting the lower edge of said bight portion beyond said plane.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR6910104A FR2039523A5 (en) | 1969-04-02 | 1969-04-02 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3632075A true US3632075A (en) | 1972-01-04 |
Family
ID=9031810
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12397A Expired - Lifetime US3632075A (en) | 1969-04-02 | 1970-02-18 | Dismantling keybolt for a propping-up and supporting framework |
Country Status (3)
Country | Link |
---|---|
US (1) | US3632075A (en) |
DE (1) | DE2015167A1 (en) |
FR (1) | FR2039523A5 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2450501A1 (en) | 2010-11-08 | 2012-05-09 | B Nova (Sas) | Device for moving a slab and/or balcony formwork platform |
US11834804B1 (en) * | 2022-09-01 | 2023-12-05 | Tom Malloy Corporation | Retainer plate and retention pin for trench shoring securement |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102011081794B4 (en) * | 2011-08-30 | 2013-12-24 | Doka Industrie Gmbh | Schaltisch for the field of construction and use of a double-acting hydraulic cylinder |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1552912A (en) * | 1924-06-20 | 1925-09-08 | Samuel S Colt | Wedge |
GB342876A (en) * | 1930-01-18 | 1931-02-12 | Consett Iron Company Ltd | Improvements in pit props |
GB584220A (en) * | 1944-12-16 | 1947-01-09 | Mavor & Coulson Ltd | Improvements in roof supports for use in mines |
-
1969
- 1969-04-02 FR FR6910104A patent/FR2039523A5/fr not_active Expired
-
1970
- 1970-02-18 US US12397A patent/US3632075A/en not_active Expired - Lifetime
- 1970-03-28 DE DE19702015167 patent/DE2015167A1/en active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1552912A (en) * | 1924-06-20 | 1925-09-08 | Samuel S Colt | Wedge |
GB342876A (en) * | 1930-01-18 | 1931-02-12 | Consett Iron Company Ltd | Improvements in pit props |
GB584220A (en) * | 1944-12-16 | 1947-01-09 | Mavor & Coulson Ltd | Improvements in roof supports for use in mines |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2450501A1 (en) | 2010-11-08 | 2012-05-09 | B Nova (Sas) | Device for moving a slab and/or balcony formwork platform |
FR2967181A1 (en) * | 2010-11-08 | 2012-05-11 | Nova B | DEVICE FOR MOVING A SLAB AND / OR BALCONY FORMWORK PLATFORM. |
US11834804B1 (en) * | 2022-09-01 | 2023-12-05 | Tom Malloy Corporation | Retainer plate and retention pin for trench shoring securement |
Also Published As
Publication number | Publication date |
---|---|
FR2039523A5 (en) | 1971-01-15 |
DE2015167A1 (en) | 1971-01-21 |
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