Ladder provided with reflectors

Abstract: A reflector (5) having a plurality of grooves formed on the outer periphery and extending in the axial direction thereof and irregularities formed on the inner periphery thereof to provide secure engagement of the reflector on each cross piece (2) of a ladder. The reflectors are easily attached to each cross piece (2) and can be reliably held thereon thereby preventing accidents when the user goes up or down the ladder. The ladder provided with the reflectors includes a pair of beams (1), a plurality of cross pieces (2) provided between and connecting the beams, and each cross piece has a plurality of grooves (3) provided on the outer periphery and extending in the axial direction thereof. A reflector (5) is disposed on at least one end of each cross piece at a connecting portion between the cross piece and the respective beam, and each reflector is ring shaped and has a plurality of irregularities formed on the inner periphery at a small diameter portion thereof which engage in the grooves of the respective cross piece. Reflector portions having irregularities are also formed on the inner periphery of the reflector at a large diameter portion thereof, and a plurality of grooves are formed on the outer periphery and extend in the axial direction thereof.

Description: BACKGROUND OF THE INVENTION 1. Field of the invention: The present invention relates to a ladder provided with reflectors, and more particularly to a ladder comprising a pair of beams and a plurality of lateral cross pieces serving as footholds and connecting both beams. 2. Prior Art: A conventional ladder comprising a pair of beams and a plurality of cross pieces serving as footholds for connecting both beams and provided with reflectors disposed on at least one end of each cross piece is known as disclosed in JP-A-08 189 277. In this conventional ladder, a plurality of grooves are formed on the outer periphery of each reflector in the circumferential direction so that the reflectors can perform diffused reflection. If the conventional ladder provided with reflectors on each cross piece of foothold is used underground or at a dark spot during the night, the contour of the ladder can be easily distinguished. However, when a person gets his or her foot or feet on the reflectors or the person grips the reflectors by hand or hands, there is a possibility that the feet or hands of the person may slide off of the ladder because of the presence of a plurality of grooves formed on the outer peripheries of the reflectors in the circumferential direction. Accordingly, the person is put in danger when the person goes up and down the ladder, and there is a possibility of the occurrence of an accident, for example the person may fall down from the ladder. Further, since special attention is not paid to the engagement between each cross piece and the reflectors, there is a possibility that the reflectors may turn or rotate relative to each cross piece and the reflectors are not securely held by each cross piece when placing the feet or foot on or off of the reflectors or gripping the reflectors with the hand or hands. SUMMARY OF THE INVENTION The present invention has been made in view of the problems of the above-mentioned conventional ladder provided with reflectors. Therefore, the object of the present invention is to provide a ladder construction which allows that a person is safe and is not put in danger when going up or down the ladder, and that the reflectors can be easily attached to each cross piece and can be reliably held by each cross piece. To achieve the above object, the ladder of the present invention comprises a pair of beams, a plurality of cross pieces provided between and connecting the beams, each cross piece having a plurality of grooves provided on the outer periphery which extend in the axial direction thereof, and reflectors disposed on at least one end of each cross piece at connecting portions between the cross piece and the respective beams, wherein each reflector is ring-shaped and has a plurality of irregularities formed on the inner periphery at a small diameter portion thereof which engage in the grooves of each cross piece, and reflector portions having irregularities formed on the inner periphery at a large diameter portion thereof, and a plurality of grooves formed on the outer periphery which extend in the axial direction thereof. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a fragmentary perspective view of a ladder provided with reflectors according to a preferred embodiment of the invention; Figure 2 is a fragmentary front view of the ladder provided with reflectors; Figure 3 is a plan view of a reflector; Figure 4 is a side elevational view of the reflector shown in Figure 3; Figure 5 is a sectional view taken along the line 5-5 in Figure 3; and Figure 6 is an enlarged sectional view taken along the line 6-6 in Figure 1. PREFERRED EMBODIMENT OF THE INVENTION A ladder provided with reflectors according to a preferred embodiment of the invention will be now described with reference to Figures 1 to 5. In these figures, reference numeral 1 depicts the pair of beams which are positioned at both side of each cross piece 2 serving as a foothold, wherein a plurality of cross pieces 2 are arranged between and interconnect the beams 1. A plurality of grooves 3 are formed in the outer periphery of each cross piece 2. The grooves 3 are uniformly spaced about the circumference of the respective cross piece 2 and each groove 3 extends in the axial direction thereof. Each cross piece 2 additionally includes a plurality of outwardly projecting and axially extending ribs 3A. The ribs 3A and grooves 3 are arranged in an alternating manner about the circumference of the respective cross piece 2. Denoted by 4 are holes defined in each beam 1 which holes 4 open at an inwardly facing side thereof and extend into the inside thereof. The opposite terminal ends of each cross piece 2 are inserted into the respective holes 4. Respective ring-shaped reflectors 5 are engaged in and arranged on both ends of each cross piece 2 adjacent the connecting portions between the respective beam 1 and each cross piece 2. The reflectors 5 may be positioned adjacent the inner sides of both beams 1 as shown in Figure 2, or may be positioned only at the inner side of one beam 1. Furthermore, in accordance with an alternative embodiment, the ends portions of each cross piece 2 may be reduced in diameter, and the ring-shaped reflectors 5 may be engaged in and disposed on these ends portions of reduced diameter, such that the outer peripheries of the reflectors 5 are flush with those of each cross piece 2. Both ends of each cross piece 2 are retained relative to the beams 1 by pins 6 which extend into the holes 4 defined in the beams 1 and through the ends of the cross piece 2 in a state where the reflectors 5 are engaged in the outer periphery of each cross piece 2. Both ends of each cross piece 2 penetrate the respective beams 1, and the cross pieces 2 are retained or secured relative to the beams 1 by pins 6, the ends of which pins 6 engage in openings in the opposite outer sides of the respective beams 1. The ring-shaped reflectors 5 are engaged in the outer periphery of each cross piece 2. The reflectors 5 have a plurality of grooves 7 formed along the outer peripheries thereof which extend in the axial direction similar to the grooves 3 of each cross piece 2. In addition, the grooves 7 are uniformly spaced about the circumference of the respective reflector 5. The reflectors 5 are made, for example, of polycarbonate, acrylic resin, or a transparent high polymer material. The reflectors 5 have a plurality of irregular grooves 12 and irregular reflector portions 8 provided at the inner peripheries thereof as discussed below. A plurality of projections 9 are formed along each groove 7 about the circumference of the reflector 5 so that light is diffused thereon. The inner diameter of each reflector 5 is axially stepped and in this regard has a small diameter portion 10 and a large diameter portion 11, wherein the grooves 12 extend a short axial distance along the small diameter portion 10. The reflectors 5 also include axially elongate, rib-like projections 12A which alternate with the grooves 12 about the inner periphery thereof at portion 10 so as to conform to the outer peripheral shape of each cross piece 2. These projections 12A engage in the respective grooves 3 of the cross piece 2, and likewise the ribs 3A of the cross piece 2 engage in the grooves 12 of the reflector 5 to permit the ring-shaped reflectors 5 to be reliably secured to the cross piece 2. The large diameter portion 11 is slightly greater than the outer diameter of each cross piece 2 and the reflector portions 8 are located along portion 11. When the reflectors 5 are engaged in or mounted on each cross piece 2, minute spaces are defined or formed radially between the outer surface of each cross piece 2 and the inner surface or large diameter portion 11 of the reflectors 5 so that the reflection efficiency of light can be improved by these spaces. In this regard, reflector portions 8, in the illustrated embodiment, are elongate grooves or channels which extend in the axial direction along large diameter portion 11. In addition, the reflectors 5 are preferably installed on the respective cross piece 2 so that the reflector portions 8 thereof face inwardly or away from the respective beam 1. Since the ladder of the present invention is structured as set forth above, even if light of low intensity is reflected by the reflectors 5 disposed on each cross piece 2 of the ladder when the ladder is used underground or at a dark spot, the entire contour of the ladder is visible. As a result, the existence of the ladder can be confirmed to avoid collision of a person with the ladder. Even if both feet or a foot of the person is placed on the cross piece 2 or the reflectors 5, or alternatively if the cross piece 2 or the respective reflectors 5 are gripped by hands when the person goes up or down the ladder, the feet and hands are prevented from slipping by the axially extending grooves 3 and 7 respectively formed at the outer peripheries of the respective cross pieces 2 and reflectors 5, thereby preventing an accident such as the person falling from the ladder. Further, the small diameter portion 10 of each reflector 5 is engaged in the outer periphery of each cross piece 2, so that the reflector 5 does not rotate relative to the respective cross piece 2 even if a foot or feet are placed on the reflector 5, or the reflector 5 is gripped by hands, so that the reflectors 5 are reliably held by each cross piece 2. Figure 6 shows the interlocking engagement of the cross piece ribs 3A with the grooves 12 of the small diameter portion 10 of the reflector 5. In addition, the reflectors 5 are arranged so that end face thereof adjacent small diameter portion 10 abuts the inwardly facing surface of the respective beam 1. According to the present invention, the ladder includes a plurality of cross pieces provided between and connecting the beams, each cross piece having a plurality of grooves provided on the outer periphery and extending in the axial direction thereof, and reflectors disposed on at least one end of each cross piece at connecting portions between each cross piece and the respective beams, each reflector being ring shaped and having a plurality of irregularities formed on the inner periphery at the small diameter portion thereof which engage in the grooves of each cross piece, and reflector portions additionally having irregularities formed on the inner periphery at the large diameter portion thereof, and a plurality of grooves formed on the outer periphery in the axial direction thereof. As a result, the entire contour of the ladder can be clearly confirmed when the ladder is used underground or at a dark spot, and even if feet or a foot of the person is placed on each cross piece or the associated reflectors, or if each cross piece or the reflectors are gripped by hands when the person goes up or down the ladder, the feet and hands are prevented from sliding by axially extending grooves formed at the outer periphery of the cross piece and the reflectors, thereby preventing the person from being involved in an accident such as falling from the ladder. Still further, since the reflection efficiency of the reflectors can be improved and the reflectors may be merely engaged in the outer periphery of each cross piece 2, the reflectors can be easily attached to each cross piece 2 and the reflectors can be reliably held by each cross piece 2. It will be appreciated that the reflectors 5 need not be provided with an outer surface having a frusto-conical as illustrated herein, but may instead be provided with an outer surface having a constant diameter, or other configuration Although a particular preferred embodiment of the invention has been disclosed in detail for illustrative purposes, it will be recognized that the present invention includes all variations or modifications of the disclosed apparatus, including the rearrangement of parts, which lie within the scope defined by the appended claims.

Claims: A ladder comprising: a pair of upright beams (1); a plurality of cross pieces (2) extending between and inter-connecting the beams, each cross piece having a plurality of grooves (3) provided on an outer periphery thereof and extending in the axial direction thereof; and a reflector (5) disposed on at least one end of each said cross piece at a connecting portion between each said cross piece (2) and the respective beam (1), each reflector being ring shaped and having a plurality of irregularities (12A) formed on an inner periphery thereof at a small diameter portion (10) thereof which engage in the grooves (3) of each cross piece (2), and irregularly contoured reflector portions (8) formed on the inner periphery at a large diameter portion (11) thereof, and a plurality of grooves (7) formed on an outer periphery of the reflector and extending in the axial direction thereof. The ladder of Claim 1, wherein said irregularities (12A) include axially extending and elongate projections (12A) which respectively engage in corresponding grooves (3) of the respective said cross piece (2), and each said cross piece includes a plurality of axially extending and elongate ribs (3A) each disposed between an adjacent pair of said grooves (3), said ribs (3A) engaging in respective axially extending grooves (12) formed on said inner periphery of said reflector (5) in an alternating manner with said projections (12A). The ladder of Claim 1, wherein said large diameter portion (11) of said reflector (5) has a diameter greater than an outer diameter of the respective said cross piece (2) such that an annular space is defined therebetween to aid in light reflection, said space facing away from the respective beam (1). The ladder of Claim 1, wherein said large (11) and small (10) diameter portions of said reflector (5) are axially adjacent one another to provide said inner periphery thereof with a stepped configuration.

Inventors: TAKAHASHI EIZO, TAKAHASHI, EIZO
Applicants: MIYAMA KOGYO KK, MIYAMA KOGYO KABUSHIKI KAISHA
Application year: 1999
Main classification: E06C7
IPC codes: E06C7, E06C1, E06C9