GB1592340A - Bracket assembly - Google Patents
Bracket assembly Download PDFInfo
- Publication number
- GB1592340A GB1592340A GB136378A GB136378A GB1592340A GB 1592340 A GB1592340 A GB 1592340A GB 136378 A GB136378 A GB 136378A GB 136378 A GB136378 A GB 136378A GB 1592340 A GB1592340 A GB 1592340A
- Authority
- GB
- United Kingdom
- Prior art keywords
- flange
- jaw
- bracket
- flanges
- contact
- 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
Links
- 239000011435 rock Substances 0.000 claims description 3
- 239000012141 concentrate Substances 0.000 claims description 2
- 230000002401 inhibitory effect Effects 0.000 claims description 2
- 239000000725 suspension Substances 0.000 description 6
- 230000000712 assembly Effects 0.000 description 5
- 238000000429 assembly Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000003245 working effect Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B2/00—Friction-grip releasable fastenings
- F16B2/02—Clamps, i.e. with gripping action effected by positive means other than the inherent resistance to deformation of the material of the fastening
- F16B2/06—Clamps, i.e. with gripping action effected by positive means other than the inherent resistance to deformation of the material of the fastening external, i.e. with contracting action
- F16B2/065—Clamps, i.e. with gripping action effected by positive means other than the inherent resistance to deformation of the material of the fastening external, i.e. with contracting action using screw-thread elements
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Clamps And Clips (AREA)
Description
(54) NEW OR IMPROVED BRACKET ASSEMBLY
(71) We, BEcoRa (G.B.) LIM1TED, a
British Company of 2, Leslie Road, Gregory
Boulevard, Nottingham NG7 6PB, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following state ment :- This invention relates to an assembly comprising an elongate, flanged support and a bracket attached to the support with a jaw member of the bracket clamped to a flange of the support. Assemblies of this kind are commonly used in mining operations where the support is often in the form a roof-supporting arch girder and the bracket is used to suspend a further member from the girder.
In known assemblies of this kind, the jaw member includes opposed jaw portions between which the flange of the support is disposed.
Each jaw portion is in pressure contact with the flange over substantially the entire length of the jaw portion. By the length of the bracket and of the jaw portion we mean the dimension which extends in the same direction as the length of the support. The known assemblies are satisfactory when the portion of the flange with which the bracket is engaged is approximately horizontal. The known assemblies are not entirely satisfactory in circumstances where the part of the flange with which the bracket is engaged is inclined to the horizontal so that one end of the jaw portion is higher than the other end. In such circumstances, the known brackets are susceptible to sliding down the flange.
Brackets of the kind referred to which are capable of resisting sliding along the length of the flange have been proposed for example in
British Patents 833, 137 and 837, 873. The brackets disclosed in these patents are for use to support a load, and to enable the load and bracket to be moved along a beam and locked on the beam after movement. Such locking is achieved by ensuring that the bracket supports the load at a point significantly nearer one end of the bracket than the other. The load then applies a turning moment to an element of the bracket when the bracket is engaged with a horizontal flange so that teeth on the element engage the beam and prevent sliding. A disadvantage of this known bracket is that it will not lock itself onto the flange if the length of the flange in inclined to the horizontal at an angle within a certain range.
According to a first aspect of the invention there is provided an assembly comprising an elongate support and a bracket attached to the support, the support having a flange with a free margin, the bracket engaging opposite faces of the flange, the length of the flange being inclined to the horizontal, and the bracket comprising a jaw member clamped to the flange and including opposed jaw portions between which the flange is disposed and which lie adjacent to respective ones of said faces of the flange, wherein one of the jaw portions contacts the adjacent face of the flange at one position along the length of the jaw portion and is spaced from said face along the remainder of its length, and means is provided for suspending a load from a bracket at a position which is at least approximately equidistant from the ends of the jaw member.
By the phrase "approximately equidistant" we intend to differentiate an assembly according to the present invention from the known locking assemblies hereinbefore mentioned.
When the flange of the present invention is inclined to the horizontal at an angle where there is a risk of the bracket slipping along the length of the flange, the load will produce a sufficiently large moment for rocking of the jaw member about a rocking axis which is generally parallel to a face of the flange and perpendicular to the free margin thereof to occur. Such rocking establishes a relatively high contact pressure between the jaw portion and the flange at said one position. This high contact pressure reduces the risk of the bracket sliding down the flange by establishing a large frictional force and/or some deformation of the flange. Hence a grip is achieved to counteract the risk of slipping.
Preferably, each jaw portion contacts the adjacent face of the flange at one position along the length of the jaw portion. The positions of contact between respective jaw portions and the flange may be spaced apart along the flange.
At least one of the jaw portions preferably has a protuberance at said one position along its length, the protuberance contacting the flange.
There are preferably on one of the jaw portions two protuberances with a clamping member disposed between them.
In an alternative embodiment the clamping member may be in contact with a face of the flange, instead of one of said protuberances.
The flange preferably has at its face margin an edge face which is in pressure contact with an intermediate surface of the jaw member lying between the jaw portions.
The support may have two oppositely directed flanges in which case the bracket preferably comprises two jaw members engaged with respective ones of the flanges.
The two jaw members may have a common fulcrum.
The clamping member may extend between the jaw members and be adjustable to draw jaw members towards each other into clamping engagement with the edge faces of the flanges.
According to a second aspect of the invention there is provided a bracket for use in an assembly according to the first aspect of the invention, the bracket comprising ajaw member including opposed jaw portions between which, in use, the flange of the support is disposed with opposite faces ofthe flange adjacent to respective ones of thejaw portions, there being, adjacent to one end of one of the jaw portions, a proturberance which engages in use with the adjacent face of the flange, and there being, at least approximately equidistant from the ends of the jaw member, a means for suspending a load from the bracket.
The invention will now be described, by way of example, with reference to the accompanying drawings wherein:
Figure 1 shows an end elevation of a bracket attached to a flanged support and a part of a chain suspended from the bracket;
Figure 2 shows a cross section on the line 2-2 of Figure 1, the support and the cabin being omitted; and
Figure 3 shows a cross-section on the line 3-3 of Figure 1.
The assembly which is illustrated in the accompanying drawings comprises an elongate support 10 and a bracket 11 attached to the support. The support is an arch girder of the kind commonly used in mine workings for supporting roadway roofs and has an I-shaped cross-section including a vertical web 12, a pair of flanges (not shown) disposed at the outer face of the arch and a further pair of flanges, 13 and 14, disposed at the inner face of the arch. The arch as a whole, and therefore the flanges 13 and 14, are curved, the radius of curvature typically being 61Aft. Over a short length of the arch, say less than 6", the flanges are substantially flat. Over the major part of the length of the arch, the flanges 13 and 14 are inclined to the horizontal.In that part of the arch which is illustrated in Figure 3, the flanges 13 and 14 are inclined at an angle of approximately 45 to the horizontal.
The bracket 11 comprises two jaw members 15 and 16 respectively which are engaged with respective ones of the flanges 13 and 14. The jaw member 15 includes opposed jaw portions 17 and 18 between which the flange 13 is disposed, the jaw portion 17 lying adjacent to an upper face of the flange and the jaw portion 18 lying adjacent to a lower face of the flange. As can be seen from Figure 1, the gap between the upper and lower jaw portions is somewhat larger than the thickness of the intervening part of the flange so that there is a clearance space between at least one of the jaw portions and the flange.
Between the jaw portions 17 and 18 there is an intermediate portion of the jaw members which presents an intermediate surface 19 towards an edge face of the flange at the free margin thereof. The edge face of the flange and the intermediate surface of the jaw member are substantially parallel to each other and generally parallel to the faces of the web 12 although it will be understood that the edge face may merge with upper and lower faces of the flange through rounded corners.
The jaw member 16 comprises upper and lower jaw portions 20 and 21 respectively and an intermediate surface 22 which are arranged in relation to the flange 14 in a similar way to that in which the corresponding parts of the jaw member 15 are ananged in relation to the flange 13.
Each of the jaw members 15 and 16 further includes a suspension element, 23 and 24 respectively, which is integral with the upper and lower jaw portions. The suspension elements extend from the lower jaw portions in a direction away from arch 10 and are each formed with an aperture through which a bolt 25 extends to connect the suspension elements together. A chain 26 is suspended from a part of the bolt 25 which lies between the suspension elements 23 and 24, only a part of one link of the chain being shown in Figure 1.
This link limits approach of the suspension elements 23 and 24 towards each other and acts as a fulcrum for rocking of the jaw portions 17 and 18 of the jaw member 15 towards and away from the jaw portions 20 and 21 of the jaw member 16. The chain link is clamped between the suspension elements.
The bracket comprises a further bolt 27 which passes through respective apertures in the jaw members 15 and 16 and is, in the assembly shown in the drawing at a level such that a shank of the bolt contacts the lower faces of the flanges 13 and 14. The bolt 27 lies at a position midway between opposite ends of each jaw member and so provides a fulcrum on which the jaw members can rock together about a rocking axis 28 which is parallel to the lower faces of the flanges and perpendicular to the free margins thereof. The rocking movement is limited by engagement between the jaw portions and the flange so that the range of possible rocking movement is determined by the size of the clearance spaces between the jaw portions and the adjacent faces of the flanges.
When the bracket 11 is assembled on the arch 10, the bolt 27 is tightened to clamp the jaw members 15 and 16 tightly to the flange 13 and 14 and establish pressure contact between the intermediate surfaces 22 of the jaw members and the edge faces of the flanges. This pressure contact gives rise to substantial frictional forces which oppose rocking movement of the jaw members about the axis 28 but if a large load is suspended from the bracket when the latter is engaged with flanges which are inclined to the horizontal, as shown in Figure 3, the moment applied by the load is sufficient to overcome the frictional forces and some degree of sliding of the intermediate surfaces 22 over the edge faces of the flanges occurs until the jaw members reach the limiting position illustrated in Figure 3.
In a preferred assembly (not shown in the drawing) the thickness of the flanges and/or the position of the bolt corresponding to bolt 27, relative to the jaw portions are such that the bolt is not in contact with the flanges. The bolt does not then provide a fulcrum, a rocking and sliding motion of the assembly occurring as the pressure contact between the intermediate surfaces of the jaw members and the edge faces of the flanges is overcome.
The upper jaw portion 17 presents for engagement with the upper face of the flange 13 a substantially flat surface which is continuous between the ends of the jaw portion.
The lower jaw portion 18 comprises two protuberances 29 and 30 which are disposed adjacent to opposite ends of the jaw portion and are presented towards the lower face of the flange 13. Thus, the surface of the jaw portion 18 which is adjacent to the lower face of the flange is interrupted by a gap between the protuberances 29 and 30. It will be noted that the proturberances 29 and 30 lie on opposite sides of the bolt 27 and rocking axis 28.
As can be seen from Figure 3, when the bracket is rocked into one of the limit positions, the upper jaw portion 17 contacts the flange 13 at one position only along the length of the jaw portion, namely adjacent to an upper end of the jaw portion. Along the remainder of its length, the upper jaw portion is spaced from the flange by a clearance space 31. Similarly, contact exists between the lower jaw portion 18 and the lower face of the flange at one position only along the length of the jaw portion, namely at the protuberance 29. The lower jaw portion is spaced from the flange along the remainder of its length. It will be noted that the protuberance 29 is at a lower end of the jaw portion 18, so that contact is established between the jaw portions and the flange at respective positions which are spaced apart along the flange.
Since contact between the jaw portions 17 and 18 on the one hand and the flange 13 on the other hand is restricted to a single position for each jaw portion, the contact pressures are much higher than would be the case if contact was established along the entire length of each jaw portion. The application of a vertically downward load to the bracket by the chain 26 further increases the contact pressure. The surfaces of the protuberances 29 and 30 which are presented towards the flange 13 may be rounded, to further concentrate the contact within a small area. The contact pressure which is established is sufficient to prevent sliding of the jaw member along the flange by virtue of the high frictional force which can arise between the protuberance and the flange.
Additonally or alternatively, the pressure contact may be sufficient to deform the flange at the position where contact is established by the protuberance, such deformation inhibiting sliding of the jaw member along the flange.
A corresponding relation exists between the jaw member 16 and the flange 14.
If the bracket 11 is attached to a part of the arch girder 10 in which the flanges 13 and 41 are substantially horizontal, contact will be established between the upper jaw portions 17 and 20 and the upper faces of the flanges along substantially the entire length of each jaw portion and the lower jaw portions 18 and 21 will be out of contact with the flanges. If the bracket is attached to a part of the arch where the inclination of the flanges is in the opposite direction to that illustrated in Figure 3, the jaw members will rock into a position such that the proturberance 30 contacts the flange and there is a clearance between the flange and protuberance 29.
WHAT WE CLAIM IS:
1. An assembly comprising an elongate support and a bracket attached to the support, the support having a flange with a free margin, the bracket engaging opposite faces of the flange, the length of the flange being inclined to the horizontal, and the bracket comprising a jaw member clamped to the flange and including opposed jaw portions between which the flange is disposed and which lie adjacent to respective ones of said faces of the flange, wherein one of the jaw portions contacts the adjacent face of the flange at one position along the length of the jaw portion and is spaced from said face along the remainder of its length, and means is provided for suspending a load from the bracket at a position which is at least approximately equidistant from the ends of the jaw member.
2. An assembly according to Claim 1 wherein each jaw portion contacts the adjacent face of the flange at one position along the length of the jaw portion.
3. An assembly according to Claim 2 wherein the positions of contact between respective jaw portions and the flange are spaced apart along the flange.
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (10)
1. An assembly comprising an elongate support and a bracket attached to the support, the support having a flange with a free margin, the bracket engaging opposite faces of the flange, the length of the flange being inclined to the horizontal, and the bracket comprising a jaw member clamped to the flange and including opposed jaw portions between which the flange is disposed and which lie adjacent to respective ones of said faces of the flange, wherein one of the jaw portions contacts the adjacent face of the flange at one position along the length of the jaw portion and is spaced from said face along the remainder of its length, and means is provided for suspending a load from the bracket at a position which is at least approximately equidistant from the ends of the jaw member.
2. An assembly according to Claim 1 wherein each jaw portion contacts the adjacent face of the flange at one position along the length of the jaw portion.
3. An assembly according to Claim 2 wherein the positions of contact between respective jaw portions and the flange are spaced apart along the flange.
4. An assembly according to Claim 2 or
Claim 3 wherein at least one of the jaw portions has a protuberance at said one position along its length, the protuberance contacting the flange.
5. An assembly according to any preceding claim wherein the flange has at its free margin an edge face which is in pressure contact with an intermediate surface of the jaw member lying between the jaw portions.
6. An assembly according to any preceding claim wherein the support has two oppositely directed flanges and the bracket comprises two jaw member engaged with respective ones of the flanges.
7. An assembly according to Claim 6 wherein a clamping member extends between the jaw members and is adjustable to draw the members towards each other into clamping engagement with the edge faces of the flanges.
8. A bracket for use in an assembly according to Claim 1, the bracket comprising a jaw member including opposed jaw portions between which, in use, the flange of the support is disposed with opposite faces of the flange adjacent to respective ones of the jaw portions, there being, adjacent to one end of one of the jaw portions, a protuberance which engages in use with the adjacent face of the flange, and there being, at least approximately equidistant from the ends of the jaw member, a means for suspending a load from the bracket.
9. A bracket substantially as herein described with reference to and as shown in the accompanying drawing.
10. An assembly substantially as herein described with reference to and as shown in the accompanying drawing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB136378A GB1592340A (en) | 1978-01-13 | 1978-01-13 | Bracket assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB136378A GB1592340A (en) | 1978-01-13 | 1978-01-13 | Bracket assembly |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1592340A true GB1592340A (en) | 1981-07-08 |
Family
ID=9720718
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB136378A Expired GB1592340A (en) | 1978-01-13 | 1978-01-13 | Bracket assembly |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1592340A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2131756A (en) * | 1982-12-09 | 1984-06-27 | Primrose Third Axle Company Li | Vehicle safety guard |
| GB2135263A (en) * | 1983-01-27 | 1984-08-30 | Courtney Pope | Handrail clasp |
| GB2137581A (en) * | 1983-03-19 | 1984-10-10 | Keith Riley | Clamp-support for a pulley |
| GB2175341A (en) * | 1985-04-04 | 1986-11-26 | Becorit | Clamps |
| GB2307511A (en) * | 1995-10-14 | 1997-05-28 | Niall Richard Thomson | A clamping member that secures a hinge pin to a post |
| GB2316976A (en) * | 1996-09-03 | 1998-03-11 | Triple E Limited | Improvements in clamps |
-
1978
- 1978-01-13 GB GB136378A patent/GB1592340A/en not_active Expired
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2131756A (en) * | 1982-12-09 | 1984-06-27 | Primrose Third Axle Company Li | Vehicle safety guard |
| GB2135263A (en) * | 1983-01-27 | 1984-08-30 | Courtney Pope | Handrail clasp |
| GB2137581A (en) * | 1983-03-19 | 1984-10-10 | Keith Riley | Clamp-support for a pulley |
| GB2175341A (en) * | 1985-04-04 | 1986-11-26 | Becorit | Clamps |
| GB2307511A (en) * | 1995-10-14 | 1997-05-28 | Niall Richard Thomson | A clamping member that secures a hinge pin to a post |
| GB2316976A (en) * | 1996-09-03 | 1998-03-11 | Triple E Limited | Improvements in clamps |
| GB2316976B (en) * | 1996-09-03 | 2000-12-06 | Triple E Ltd | Improvements in clamps |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |