Telescopic lift for construction works
United States Patent 3891062

There is disclosed a mobile lift made up of a rectilinear guide adjustably held in upward inclined position by a support having a base of which the end is wheel-mounted so that the lift may be displaced. A load carrier is movably mounted on the said guide and a cable, of which one end is secured on the carrier and the other winds around a mechanical winch after having wound around a pulley, allows displacement of the carrier on the guide.

Application Number:
Publication Date:
Filing Date:
Primary Class:
Other Classes:
182/103, 187/243, 187/900
International Classes:
B66B9/16; (IPC1-7): B66B9/20
Field of Search:
187/10,11,12,13,14,95,9,2,6 214
View Patent Images:
US Patent References:
3344885Personnel lift1967-10-03Rasmussen
3312307Hill climbing elevator1967-04-04Camp
2586531Wheeled support having ladder assembly1952-02-19Gordon
2542383Portable elevating conveyer1951-02-20White
2438791Sliding ladder jack1948-03-30Russell
2249900Extension ladder and elevator1941-07-22Honig
2198071Extensible fire ladder1940-04-23Artini
2100169Elevator roller guide shoe1937-11-23Norton

Primary Examiner:
Blunk, Evon C.
Assistant Examiner:
Rowland, James L.
I claim

1. A brick lift comprising:

2. A brick lift as claimed in claim 1, wherein said adjusting means for said platform comprises:

The present invention relates to a brick lift and more particularly to a lift that can easily be moved from one place to another and that can advantageously serve to raise bricks to a predetermined level of use.

The bricklayers job, when the wall on which they work has reached a certain level above the ground, becomes appreciably more difficult due to the fact that the bricks and mortar must be carried manually at increasingly higher levels. This difficulty tends to decrease the efficiency of the bricklayers and thus raise the cost of their work or then additional labor must be hired to ensure the bricklayers with an uninterrupted supply of bricks and mortar. To my knowledge, no lift exists which is especially adapted for this type of operation, that is a lift of extreme simplicity such that it can be mounted on site and eventually repaired by the user himself who would not necessarily possess particular ability in the practice of mechanical trades. The lift must also be sufficiently light and wheel-mounted so that it can easily be displaced and follow the bricklayer as his work progresses. It must also be adjustable in height, and this very easily, whereby to be able to reach levels at different elevations.

I have invented a brick lift which possesses the aforementioned features and which comprises: a rectilinear elongated guide formed of two spaced parallel straight rails defining, in transverse cross-section, upper and lower flat tracks and flat inner and outer side runways and wherein each rail is formed of a lower hollow part and an upper part of smaller cross-section than that of the lower part whereby it may slidably be received therein, the said parts thereby defining a shoulder at their junction. A brick carrier is movably mounted on the guide and has a rolling undercarriage displaceable therealong and a brick carrying platform pivoted at one end to the undercarriage, means being provided to adjust the platform to hold it horizontal. The undercarriage further comprising rollers mounted for rotation about axes extending transversely of the longitudinal axis of the guide and riding on the flat upper tracks; other rollers mounted for rotation about an axis extending transversely of the longitudinal axis of the guide and riding on the flat lower tracks and still further rollers mounted for rotation about axes perpendicular to the guide and riding on the flat side outer runways. The undercarriage further includes a rattle-preventing device which comprises: rigid frames between the rails and adjacent the flat inner runways; levers mounted, intermediate the ends thereof, at the ends of the frames for pivotal movement about upright axes; rollers with upright pivotal axes mounted at the other end of the levers distant from the frames, and resilient means between the other ends of the levers and the frames to bias the last-mentioned rollers resiliently constantly against the inner side runways and against the shoulder. Finally, the brick-lift comprises a support for adjustably holding the guide in upwardly inclined position, this support comprising: a base wheeled at one end and pivotally mounted at the other end to the lower end of the guide; a stay pivotally mounted at one of its ends on the wheeled end of the base and means interconnecting the other end of the stay and the guide to allow relative sliding motion therebetween.

A better idea of my invention will be afforded by the description that follows of a preferred embodiment, the description having reference to the appended drawings wherein:

FIG. 1 is a perspective view of a lift made according to my invention;

FIGS. 2 and 3 are side elevation views illustrating the lift with the guide in two different inclinations;

FIG. 4 is a perspective view of the load carrier;

FIG. 5 is a side elevation of the load carrier on a larger scale;

FIGS. 6 and 7 are two vertical cross-sectional views intended to illustrate a portion of the rattle-preventing device in two different positions of operation, and

FIG. 8 is a partial view in vertical and transverse cross-section of the guide intended to illustrate the connection between the support and the lift guide.

The lift of my invention generally comprises a rectilinear guide 1 adjustably held in upwardly inclined position by a support 3; a load carrier 5 being movably mounted on the guide 1 to be displaced between a bottom loading position, near the ground, and a top unloading position at the level of use on a scaffold 7.

The guide is made up of two spaced parallel rails 9 reinforced by straight transverse braces 11. The load carrier 5 displaceable on the rails 9 is formed of a rolling undercarriage 13 on which a platform 15 is mounted for carrying the loads. The undercarriage 13 is provided with a device 17 for preventing rattling of the platform 15 during displacement of the carrier 5 in order to avoid that the bricks fall and injure someone in their fall.

Each rail has a quadrilateral transverse cross-section defining an upper track 19, a lower track 21 and two side runways 23, 23', having flat riding surfaces. The rolling undercarriage 13 comprises two rear rollers 25 mounted on an axle 27 secured at its ends on vertical gussets 29. It also comprises forward wheels 25' mounted on an axle 27' likewise secured at its ends on gussets 29. The aforementioned device 17 of the undercarriage 13 is first made up of lower rollers 31 having a horizontal rotation axis and held on the gussets 29 through an axle 33 (FIG. 4). The rollers 31, bearing against the track 21, working with the rollers 25, 25' prevent vertical rattling of the vertical carrier 5. Lateral rattling is prevented by means of rollers 35, rotatable about vertical axes, held by suitable blades 37 secured on the gussets 29, the rollers 35 bearing against the outer side runways 23 of the rails 9.

As illustrated in FIG. 1, each rail may be formed of a lower part, which will continue to be referred to by numeral 9, and of an upper part 9'. The lower part 9 is hollow and telescopically slidably receives the part 9' which has a smaller size cross-section so that it may slide in the part 9 without play therebetween. It will thus be understood that, in this manner, the guide 1 may appreciably be extended. Means will obviously have to be provided for locking the two parts 9, 9' together when the rails are extended to the desired length. This may easily be obtained by providing two holes facing one another in the side runways 23, 23' of part 9 and a series of holes in the opposite side runways of the part 9' adapted to successively register, in pair, with the holes of the part 9. It will then only be necessary to insert a pin through the holes to lock the parts 9, 9' together. It will be noted that the shoulders 39 (FIG. 7) are defined by the inlet ends of the rails 9.

It will thus be gathered that when the load carrier 5 moves on the extension of the guide 1 formed by the part 9', the rollers 35 are no longer applied firmly against the outer sidewalls 23 and there is a clearance therebetween equal to the thickness of shoulder 39, as FIG. 7 attempts to show, for illustration purposes. To avoid lateral rattling resulting from the said shoulder 39, I have provided a device illustrated in FIGS. 6 and 7 which is applied against the inner side runways 23' of the rails.

This device comprises rigid frames 41 arranged close to the inner runways 23'. Levers 43 are mounted at 44, intermediate their ends, to the extremities of the frames 41 for pivotal movement about vertical axes. Rollers 45, having vertical rotation axes, are provided at the ends of the levers 43 away from the frames 41 whereas springs 47 are provided between the frames 41 and the inner ends of the levers 43 to bias the latter away from the former. To achieve this, the rear end of the levers 43 may be curved, as illustrated. It will thus be understood that the rollers 45 are constantly biased towards the runways 23'. The device therefore takes care of the shoulder 39.

The rattling-preventing device 17 is integrated to the rolling undercarriage 13 by means of risers 49 secured, on the one hand, to the frames 41 and, on the other hand, to a rectangular frame made up of side members 51 and transverse members 53 (FIG. 4). The side members 51 are, in turn, secured to the gussets 29 as shown clearly in FIG. 5.

Referring again to this FIG. 5, it will be seen that the platform 15 is pivoted at 55 on its forward end with respect to its rising movement to the rolling undercarriage 13 and more particularly to the gussets 29. I have provided an adjustment mechanism capable of bringing platform 15 to horizontal position when the slope of the guide 1 is changed. This mechanism comprises rods 57 pivotally mounted at one of their ends on the rearward end of the platform 15 and slidable in tubular sleeves 59 pivotally mounted at their longitudinal centers on the gussets 29; the rods 57 being made fast in position by means of wing screws 61, for instance.

Turning again to FIGS. 1, 2 and 3, the support 3 of the guide 1 comprises a base 63 pivotally mounted at one of its ends to the lower end of the guide 1 and mounted on wheels 65 at its other end. The support likewise comprises a stay 67 pivotally mounted at one of its ends on the wheeled end of the base 63 and provided, at its other end, with means capable of ensuring a relative movement between the said stay 67 and the guide 1. The latter means thus interconnect the upper end of the stay 67 and the guide to allow relative sliding motion therebetween.

As perhaps best illustrated in FIG. 8, these sliding motion means are, on the one hand, constituted by channel members 69, 69' respectively provided at the upper end of the stay 67 and on the cross-members 11 between the rails 9. The channel members 69, 69' face one another vertically and are inserted one into the other through their flanges. The sliding motion means further comprise a manually operated winch 71 mounted on a pedestal 73 of the base 63, there being a pulley 74 mounted at the upper end of the stay 67 and a cable 75 winding at one end on the winch 71, around the pulley 74 and being secured, at the other end, to the base 63 at 77.

As FIGS. 2 and 3 clearly illustrate, it will be possible to change the slope of the guide simply by actuating the winch 71. It will be necessary to provide a known means to lock the winch 71 when the guide reaches the desired inclination. The latter means could take the shape of a pin 79 to be inserted simultaneously in holes provided through the support of the winch and the cheeks of the winch drum.

Vertical movement of the carrier 5 and its load can be obtained by means of a second cable 81 secured at one end to the carrier 5, winding around a pulley 83 at the upper end of the guide 1 and winding on a motorized winch 85 at its other end. To facilitate the operation of the lift, there may be provided an independent motor (not shown) connected to the winch 85 by a power take-off 87. It is also obvious that the latter motor may be mounted in permanence on the base 63 but this would necessarily increase the total weight of the lift.