JPH02144489A - Ladder brace - Google Patents

Abstract

PURPOSE: To improve safety, and reduce cost by providing a groove-shaped main body part on a brace having a step and a pair of groove-shaped crosspieces at a specified interval from each other, and setting circumferential edges of the main body part to be adjacent to the crosspieces and the step. CONSTITUTION: On a U-shaped crosspiece 11 having side flanges 25, 26 and a web 27, a groove-shaped brace 18 having a main body part 34 and a leg part 37 is extended. Next, a step 14 having outward lips 28, 29 facing each other, an upper side step surface 30, and box-shaped parts 31, 32 is installed on the brace 18 by a fastening fitting 57. The brace 18 is then fixed to the crosspiece 11 by a fastening fitting 63. A large resistance can thus be provided to damage by impact, and strength can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the field of industrial application, the prior art, and the problems to be solved by the invention.
e) and a brace connected to the ladder.

Practical efforts have been made to provide strength to the rungs of ladders, at least near the lowest step, by providing braces.

Typically, when the ladder is made of a metal material such as aluminum, the steps have a U-shaped groove structure. The six rungs had flat metal strips extending upwardly at an angle from each side flange of the groove section terminating at each side edge of the step. The strip was secured to the step and the strip by rivets or other means. Therefore, the six crosspieces had a pair of braces.

The specification of U.S. Pat. No. 2,126,171 notes that the braces extend between the step and the second step from the bottom, and that only one brace is associated with six rungs. Except this - boat fishing arrangement is illustrated.

A similar brace configuration is disclosed in US Pat. No. 3,009,535.

Such brace configurations are considered undesirable for at least two reasons. In these configurations, there is a progressively narrower space between the brace and the crosspiece.

Although not recommended, users may occasionally use the above ladders without footwear, and if the user steps incorrectly or slips off the ladder, the progressively narrower spaces described above may cause injury to the toes. It is known to cut.

There have been instances where users have cut their fingers when such braces are mounted at higher positions as described above.

Furthermore, such braces lack the strength provided when shock loads caused by a user falling or dismounting on the lowest step act on said step, so・Amplifier (fo
There is no shortage as it is called ld under). Such insufficiency results in bending of the step near the bottom step. - both said stages are typically folded in the same direction;
One rung is folded down the ladder, and the other rung is folded outward from the ladder so that it faces laterally outward. A typical example ladder can exert up to 1.2 KN, which is thus insufficient to be acceptable.

The ladder of U.S. Pat. No. 4,204,587 is provided with said braces extending between said side flanges of said channel rungs, said webs of said channels and said rungs also below. Fixed to the bottom of the step. Although the material of the brace is sufficient, this configuration nevertheless can cut a toe if the user falls from the ladder.

U.S. Pat. No. 3,083,786 discloses a brace in the form of pairs of gusset plates. While this configuration does not cut toes even when the usage volume is low, the above configuration is insufficient in terms of strength and there is still a possibility of fault amplifiers. The occurrence of such a fault amplifier would result in product predecessor claims, and this contingency warranty would result in higher warranty costs being reflected in the initial ladder selling price.

In most ladder configurations, there are multiple separate non-skid legs, such as that shown in Figure 7 of specification No. 3,083,786, which are attached to each rung. Separately fixed at the bottom end. This was an additional step in the manufacturing process and was included in the final cost of the ladder.

It is an object of the invention to provide a ladder brace which minimizes at least some of the disadvantages mentioned above.

Means for Solving the Problems/Actions/Effects of the Invention The brace of the above invention is a ladder,
ders and trestles), or
It turns out that it can be used for that kind of thing. The above invention is
Illustrated by the example regarding step 1 adders, the above term ``ladder''
is used herein to mean all types of ladders, including trestles or the like.

According to one aspect, the invention provides a brace having a step and a pair of spaced apart channel-shaped rungs, the brace having a substantially channel-shaped body along at least one circumferential surface. and a peripheral edge along the body, such that in use the brace is receivable such that the peripheral edge of the channel-shaped body is adjacent to the description and the step. .

According to another aspect of the invention, two braces are mounted extending between the lowermost step and the ladder as described, and a ladder is coupled to the braces.

The main body portion may have a groove shape throughout. In one embodiment, the body portion includes a web and two
the edges of the plurality of flanges remote from the web include the one or more adjacent edges. The body portion may be substantially triangular so that the opposed flanges are substantially triangular, although other shapes may also be used. The free edge of the triangular flange comprises the adjacent edge. The edges include a first pair of spaced edges for adjacent the step and a second pair of spaced edges adjacent the step and for being received within the shallow end. . It is conceivable that it would be preferable to fit the brace into the shallow end in this way, but with the web adjoining the second pair of edges extending between the step and the description; The above brace can be reversed.

The opposed flanges are substantially flat, but one or both of them can be contoured or stepped to provide rigidity to the brace. Preferably, both flanges are stepped. When the flange is triangular, the flange may have a triangular stepped portion.

The length of the brace can be substantially flat. Alternatively, the web can be stepped, shaped as described above, or provided with reinforcing ribs. Preferably, the web has a longitudinally extending groove or channel formed therein. The groove can have any desired cross-sectional shape, but is preferably substantially U-shaped.

The brace may have bearing legs. The support leg may have a shape extending to one end of the brace. Preferably, the support leg is received within the crosspiece 1'3. The bearing leg together with the body portion may be substantially or completely closed from the free end thereof to the adjacent step of the ladder when the brace is fitted with respect to the rung; It can be surrounded.

Preferably, the support leg has a groove-shaped cross section. The groove may be substantially U-shaped and in use have a free edge adjacent to the above.

These free edges may be formed by contiguously forming the second pair of edges of the body portion. Preferably, the groove has opposed flanges and is formed continuously with the flange of the main body.

The F groove may also have a web formed to extend into the web of the main body.

Preferably, the nib is flat and shaped such that the flange is received within the channel-shaped crosspiece.

-1~ The braces mentioned above can be formed integrally with the leg pad member. When the L/I member is placed on a ladder or on the ground, it engages with the ground and serves as a means of resistance to slipping. The pad portion is a separate component to the brace.1. It can also be formed into a single piece or attached to it. If the brace supports a supporting leg, the bed member is fixed to the leg or physically attached to it? It is possible to make it happen. To fix the pad member described in
Any suitable means of :, @ can be used. Fasteners or adhesives can be used.

Obviously, the ladder has two rungs and each brace can be fitted with respect to both rungs. If the ladder has parallel bars, the two braces may be interchangeable. If the ladder has non-parallel rungs, such as a ladder, the braces become progressively smaller and cannot be replaced.

The above braces may be applied in any suitable manner as described above in 1. It can be fixed every time. Fasteners or adhesives can be used. Welding may also be possible depending on the material from which the brace is made. The brace may be made of metal or a plastic material, preferably a plastic material.

EXAMPLES Particularly preferred aspects of the above invention are described below with reference to the above drawings.

FIG. 1 shows a part of a step 1 adder 10 having two stiles t 1 , l 2 that become narrower towards the bottom. Each rung has one or more rungs.
t). The bottom step 14 and the second step or rung 15 from the bottom are shown. Although the above figure shows a ladder, it will be appreciated that the invention also applies to other ladders with parallel rungs or to telescoping ladders.

The ladder of FIG.
9, and a brace 20.21 extending between the step 7''15 and the crosspiece 11.12.
．． 12 becomes narrower as it goes upwards, so
The above bus becomes smaller and smaller. Obviously, -
■If the two feet are parallel, this is not the case.

In FIG. 2.7.6.9 the brace 18 is shown in more detail than in FIG. The brush in FIG. 1 has similar features, except that it has mirror-like symmetry and a D-shape.

The above description II is substantially 0-shaped and has two side flanges: L'25.26 and web 27. -1～
Step 14 includes the configuration shown as having two opposing outwardly facing lips 28.29, a tread surface 30, and two box-shaped portions 31.32. have

Obviously, the above steps and the configurations described above are not essential to the invention and can be varied.

The brace 18 has a main body portion 34 and leg portions 37 .

The distribution body portion 34 is substantially groove-shaped. Periphery 38
．． 39 (see FIG. 7) is substantially 5-shaped with sections 40.41. Section 4 of each periphery
1 is adjacent to the web 27 of 11 above, while each peripheral section 40 is adjacent to the lip 2 of step t = i above.
Adjacent to the lower side of 8.29. In this way, stiffness and strength are added to the ladder to resist impact loads on the steps.

The body portion 34 has an R-gonal shape in this embodiment, and has stepped surfaces 45 and 46 at corners 42 and 43 spaced apart at a constant distance. 9, the main body portion 34 is disposed in the groove 4.
7 is provided 5. 44. The steps and grooves provide strength to the main body. The leg 37 has two spaced apart plunges 48,619 for receiving the J biped leg 13. The leg i3 can be attached by fixing the fastener st to the leg portion 37 through the opening 50.

From FIG. 2 it is clear that the brace 18 is completely closed or surrounds the lower end of the bar. By having edges 38, 39 in contact with the steps and rungs, the steps are adapted to resist impact forces on the steps.

The brace 18 has a ridge or boss 55 with an opening 156 for receiving a fastener 57 to facilitate attachment of the brace to the step.

return wings 6
1 with a recessed part 60 with a washer (recessed)
(not shown) to provide strength to the portion of the opening 62 adjacent the brace. Aperture 62 receives a fastener 63 that secures the brace to the crosspiece.

The above-mentioned braces shown in Figs. 3 to 5 have the following features:
The body of Figure 9 is not as large as the brace of Figures 2 and 7-9, except that only two openings are exposed for securing the brace to the crosspiece, such as at 1162. It is similar to Features similar to brace 20 are numbered the same as features of brace 18 above.

The opening 56 in the brace 20 indicates that the brace is connected to the fastener 5.
7 allows it to be fixed at step 15. The fastener 63 can fix the bunk 1 nose 20 to the crosspiece.

The ladder is located at the step 1 adjacent to the lower step 14. It can be seen that it is equipped with North i8.19.

Instead, in addition to 17 braces +819,
The above is 1. The ladder may also have braces 20.21 associated with steps F to 2[l, or indeed any other or all other steps of said ladder.

The brace of the invention has a greater low resistance to impact damage than conventional braces. It can be seen that the ladder has two rungs and that the illustrated bow-like brace is associated with six rungs.

[Brief explanation of the drawing]

FIG. 1 is a front view of a part of a ladder having a brace according to an embodiment of the present invention, FIG. 2 is a perspective view of a ladder brace according to an embodiment of the present invention, and FIG. FIG. 4 is another view of the brace shown in FIG. 3, FIG. 5 is a side view of the brace shown in FIG. 4, and FIG. 6 is a perspective view of the ladder brace shown in FIG. 5. 7 is another view of the brace shown in FIG. 2, FIG. 8 is a side view of the brace shown in FIG.
It is an X-ray cross-sectional view. 10... catatatsu, 11, 12... crosspiece, 14...
Bottom step, 15... Second step from the bottom, 18. 19... Brace, 25. 26... Flange, 27... Web, 28. 29... Lip, 30. Tread, 31. 32... Box-shaped part, 34... Main body part, 37
...Legs, 38.39・Periphery 1.40.41・Section, 42°43...Corners, 44...Web,
45.46...surface, ・17...groove, 48.49...
・Flange, 50... Opening, 51... Fastener, 5
5... Protuberance or boss, 56 - opening, 57 - fastener, 60 - recess, 61 - return wing, 62 - opening, 63 - fastener. Patent applicant: Bayley Aluminum Products B.T.Y. Ltd., agent: Aoyama Aoyama, and 2 other engravings of the drawings (
No change in content) Man NN Procedural amendment (voluntary) NV, [Year Patent Application No. 256893 2゜Name of invention ladder brace 3゜Relationship with the case to be amended

Claims (13)

[Claims] (1) A ladder brace having a step and a pair of regularly spaced groove-shaped rungs, the brace having a substantially groove-shaped body along at least one circumferential surface; a circumferential edge along a section of the channel, the brace being receivable within the rung such that, in use, the circumferential edge of the channel-shaped body is adjacent the rung and the step. 2. The brace of claim 1, wherein said body portion has a web and two opposed flanges, the free edges of said flanges comprising said peripheral edge. 3. The brace of claim 2, wherein said flange of said body is substantially triangular. (4) The brace according to claim 2 or 3, wherein the flange has a stepped triangular portion. (5) The brace according to claim 2, wherein the web of the brace has a reinforcing groove extending longitudinally. (6) The peripheral edge is L-shaped, the edge being provided by the free edge of the flange, and the peripheral edge comprising two edges substantially 90 degrees apart from each other. Crab braces. (7) The brace according to any one of claims 2 to 6, wherein the flange of the main body portion has an opening for fixing the brace to the step and rung of the ladder. 8. The brace of claim 7, wherein the fixing aperture for fixing the brace to the crosspiece has an associated recess for receiving a washer. 9. The brace of claim 1, further comprising legs depending from said body portion adapted to receive bearing legs. 10. The brace of claim 9, wherein the leg includes two spaced apart legs that receive flanges extending across the rung in use. (11) A ladder comprising two of the braces according to any one of claims 1 to 10, wherein the braces are fixed so as to extend between the lowest step of the ladder and the crosspiece of the ladder. A ladder made to look like this. (12) A ladder comprising a support leg attached to the leg of each of the braces according to claim 9 or 10, wherein two of the braces are provided, the lowermost step of the ladder and the support leg of the ladder. A ladder fixed to extend between the above-mentioned rungs. (13) A ladder comprising two of the braces according to any one of claims 1 to 8, wherein the brace is fixed to at least the second step from the bottom of the ladder.