US2686038A - Twin lift - Google Patents

Description

c. K. DuTzMAN 2,686,038

TWIN LIFT Alug. l0, 195.4

Filed Jan. 25, 1952 I5 Sheets-Sheet 1 28 saff 4s sl /a lo: 69 8g, Y Sgo 95 ,154 55 5; "345 ,3'

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I: I [03 53/ l V Y 44 46 9L-B4 90 54 floo 44 465s 2;@ 4 3 2 9 CAR/ K. ourzMA N l n I l ATTORISEY 85' a4 2 2.5 izo Il 2 34.- 17 s 23 INVENTOR' Aug. 10, 1954 c. K. DUTZMAN TWIN LIFT 3 Sheets-Sheet 2 Filed Jan. 23, 1952 INVENTOR CARL K. DuTzMAN ATTEY' Aug 10, 1954 c. K. DUTzMAN 2,686,038

TWIN LIFT Filed Jan. 23, 1952 3 Sheets-Sheet 3 I N VENTOR :Ll-.. cA RL K. DuTzMA/v ATT NEY Patented Aug. 10, 1954 UNITED STATES AT'ENT OFFICE The present invention relates to twin lift or jack for raising roof timbers in mines, buildings, tunnels, subways, and/or raising metal girders ior floors in buildings, and/or lifting girders and heavy timbers onto flat cars.

In mines where timbers are being used for .a roof or for reinforcing, the space is very limited, and it is difficult `for this reason, tov get timbers in proper position.

An object of the present `invention is the provision of a twin lift or jack that is easy to operate and one that is exceedingly strong and safe.

Another object of the present invention is the provision of a twin lift or jack maneuverable in any degree of a circle.

A still further object of the present invention is the provision of a twin lift or jack that may be manually or mechanically operated.

A still further object of the present invention is the provision of a twin lift or jack that may be operated vby cables or gears.

A still further object of the present invention is the provision of booms, standards or legs that are movable to a vertical or a semi-horizontal position.

A still further object of the present invention is the provision of means for steadying the booms, standards or legs when in raised position and for holding the booms, standards, or legs in spaced relation in their open and closed position.

A still further object of the present invention is the provision of safety support engaging means for the booms, standards, legs in their upward movement.

A still further object of the present invention is the provision of means for releasing the safety support engaging means from the booms, standards or legs.

A still further object of the present invention is the provision of means carried bythe booms, standards, legs, for elevating a timber, girder or the like.

A still further object of the present invention is the provision or" means for moving the elevating means in the booms, standards or legs.

A still further object of the present invention is the provision of means for locking the safety support releasing means.

A still further object of the present invention is the provision of means carried by the elevating means for receiving a timber, girder or the like.

Further objects of the present invention, together wtih the advantages thereof, will more fully appear when taken in conjunction with the accompanying drawings; wherein,

Figure 1 is a front view of the device showing the booms, standards or legs in elevated position, parts being brokenand in section.

Figure 2 is a top plan view of Figure 1, parts being shown fragmentary.

Figure 3 is a side elevational view of the device and showing the booms, standards or legs in retracted position.

Figure l is a sectional view taken on line 4-4 i of Figure l.

Figure 5 is an enlarged sectional view taken on line 5 5 of Figure 1.

Figure 6 is an end elevational View of Figure 1.

Figure 7 is a diagrammatic view of the drum, sheaves or rollers and cables, and showing the position of the booms when in raised position.

Figure 8 is an enlarged diagrammatic view of the cables, drum and .sheaves or rollers, the arrows indicating vclockwise and counter-clockwise direction of movement of the drums and cables.

.Figure 9 is an end elevational view of the base frame.

Figure 10 is a front elevational view of a modied form of the invention, parts being broken away.

Figure 11 is a sectional view .taken on line l l-H of Figure l0.

Figure 12 is anend view of the base frame illustrated in Figure 10, parts being shown fragmentary.

Figure 13 is a horizontal view of one of the threaded shafts with associated elements thereon and in section.

Figure 14 is a horizontal view of the drive shaft with associated elements thereon and in section.

In the drawings, the numeral l5 represents the twin-lifter and .it comprises a base frame made of channel beams Il and i8 that are held in spaced relation by smaller U-shaped transverse irons i9, and transverse straps 20 that are secured on the top flanges 2i and 22, and on bottom flanges 23 and 2t by spot welds 25. Mid.- way ,the ends of the channel beams il and I3 there is secured on flanges 2i and 22 by spot welds or bolts 2t, supports 2l and 28 each having a semi-circular slot that aligns With a semi-circular groove 2,3 in the channel iron beams I'! and t3, the support '27 being provided with a slot 30 for a purpose that will presently appear. Mounted .on the flanges V2| and 22 adjacent the supports 21 and 28, and secured by spot welds 3| are brackets 32 and 33, each of the brackets being provided with a bore 34, the purpose of Which will presently appear. To the flanges 23 and 2Q there is secured by bolts or other suitable means a wheel 35 having a central bore 36 that receives a pin 37.

In order that the twin-lift may rotate in a circular direction on the floor of a mine, nat car or the like, a base 38 is provided which comprises arms 39 that are provided with bores 4i) that receive bolts l for bolting the base to the floor of a building, iiat car or the like, and superposed on the base 38 and secured by bolts is a spacing plate ft2, that spaces the wheel 35 from the base 38. The pin 3l passes through apertures that are centrally disposed in the base plate 38 and in the spacing plate 42, providing free pivotal movement for the twin-lift.

The booms, standards or legs of the present invention being identical in structure, and for clarity, like numerals of reference indicate like parts in the drawings. The booms, standards or legs 43 comprise channel irons 44 and i5 that are held in spaced relation by a band Mi at the base of the booms, straps 41 and a. cap plate d3, all being secured to the channel irons by bolts 45 or by spot welding, the cap plates being provided with a central aperture 50 for a purpose that will presently appear.

Interposed between the channel irons 134 and 45 at the base, is a block 5l having pintles or pins 52 that pass through bores in the walls of the channel irons 44 and 45 and carry shoe blocks 53, the bottom edge of the blocks slidably engaging the top edge fall of guide rails 55 that may be solid or angle iron, and they are secured to the inner faces of the channel irons il and 8 by rivets or bolts 5t, each end of the shoe blocks 53 being provided with a semicircular groove l. Within the booms 133 there is mounted a lift screw 58 having mounted on its bottom end a guide block 59 that is freely movable in the booms and serves as a shoe for the lift yscrews in their upward and downward movement. The upper end of each of the lift screws pass through the central aperture 5 of the cap plates 48, the diameter of the lift screws being of smaller diameter than the apertures El), thus permitting the lift screws 58 to freely move through the apertures. Pivotally mounted on the upper end of each of the lift screws 58 is a head Si) each having a block 5|, and arms 62 that are pivotal- 1y mounted to the blocks by bolts or pins t3.

'interposed between the arms 62 are rollers 6d that are supported by pins or bolts 65, the arms also being provided with a lock screw 66 adapted to engage an element shown in dotted lines in Figure 1 that may be interposed between the arms to prevent the element from slipping. Between the heads B and cap plates t8, and in threaded engagement with the lift screws 53 is a wing-nut 6l, each adapted to move the screws 58 and heads 6i! upwardly when moved in a clockwise direction, and downwardly when moved in a counter-clockwise direction. On one face of each boom there is secured a rack-bar plate 68 for a purpose to be presently described. Mounted between the brackets 32 and 33 by bolts 59 for pivotal movement, are arms 'lil of element "il, each having a tongue 'l2 that engages the teeth 'I3 of the rack-bar plates EB. Pivotally mounted in the slot 3G of support 2 by a pin 74 is a link T5 having an arm T6, and pivotally connected to the link by pins il is one end of each of the links 18, the opposite ends of the links being pivotally connected by pins i9 to one of the arms 1B of each of elements ll. Secured to the link 15 is one end 80 of spring 8l, the opposite end 82 being secured to one of the transverse blocks 25, the spring serving as a medium for keeping the tongues 'l2 in engagement with the teeth it* in rack-bar plates 88 during upward movement of the booms, and when the booms are in fully elevated position, the elements H serve as supports for the booms.

Mounted in the semi-circular grooves 29 and the semi-circular grooves in supports 2? and 28, is a shaft 83 having one end 855 extending beyond the face of channel iron Il, the end being squared to receive a handle 85 or a ratchet handle for use in close quarters, and if desired both ends of the shaft 83 may extend beyond both side faces of the channel irons il and i8 and both ends squared. Upon the shaft there is mounted a ratchet wheel 8l and a drum 88 that is interposed between the channel irons il and i8, the drum being provided with a plurality of grooves 88 and 9B for a purpose to be presently described. The support carries a safety hook lever Sl, having one end 92 bent and adapted to engage the handle or arm 16 when the link I5 is moved to the left as shown by dotted lines in Figure l to hold the tongues E2 out of engagement with the rack-bar teeth 13. A dog 93 is mounted on the outer face of bracket 2l for engagement with the ratchet wheel 8l. The drum 88 is provided with eyelets 34 as shown in the diagrammatic views 1 and that are diametrically positioned thereon, and to the eyelets there is secured one end of cables 95 each having a portion convoluted around the drum, and each portion engaged in in grooves 89, the cables 95 being engaged by sheaves or rollers 96 for guiding the cables during movement. The opposite ends of the cables 35 are secured to the eyelets 91 carried by the booms 43. The drum is further provided with eyelets 93 that are diametrically positioned thereon and in horizontal alignment and in spaced relation from the eyelets 94. Secured to the eyelets 98, is one end 99 of cables lili), each having' a portion convoluted around the drum,

and each portion being engaged in grooves 90, the cables being engaged by sheaves mi for guiding the cables during movement. The opposite ends 132 of cables I0!) are connected to eyelets t3 that are carried by the outside face of booms d3, the cables being engaged by sheaves IM.

Interposed between the booms 43 is a spreader bar 05, the ends being provided with a U-shaped slot 15S. A pivot pin IGT is carried by each end of the spreader bar, the ends of the pivot pins being seated in eyelets |08 that are positioned on the inner faces of the booms and adjacent the top thereof. The spreader bar serves as a medium for keeping the booms in spaced relation during movement.

In the modified form of the invention shown in Figures i9 and 11, instead of the cables 95 and iti), threaded shafts H6 are provided. One end t i i of each shaft is threadably engaged in a metal bar lf2 that is provided with pinties H3 that engage the shoe blocks 53. The end of each shaft has a reduced threaded portion il@ that receives a nut H5 that serves as a stop for the shafts when the booms 43 are in fully raised position. The opposite end H6 of each shaft is of reduced diameter and it has mounted thereon a race bearing HT that is housed in a block H8 that is positioned in the channel irons il' and i8, the blocks serving as a support for the shafts IH). On the end H6 of each shaft there is keyed a beveled gear ||9 for a purpose to be presently described. Midway the ends of the channel irons |i and i3 there is mounted a beveled gear |20, and this gear meshes with gears H9. The shaft as shown in Figure 14 replaces shaft S3 when gears are used and it is positioned midway the ends of the channel irons I and |8, and it is provided with squared ends |22, and reduced portions i23 and ifi, and on each of these portions there is mounted a race bearing |25 that is housed in blocks ist that are secured to the inner or outer walls of the channel irons H and It. Upon the reduced portion |23 there is mounted and keyed a beveled gear l2? that meshes with gear |26 that imparts movement to gears H9. One of the squared ends |22 or shaft |2| may receive a handle for manual operation, and/or a ratchet handle, or it may receive a pulley wheel for connection with va motor for mechanical operation.

In the operation of the device as shown in Figures l to 8, after the device has been positioned in a selected place and a timber or girder is placed on the heads 66 of the booms t3, the handle 85 is moved in a clockwise direction and during this movement cables itil are convoluted in a clockwise direction onto the drum pulling the base of the booms :it toward the ends of the channel irons Il* and EB, and during this movement, cables 95 unreel from the drum 88 in a counter-clockwise direction, the booms moving on the shoes 53 that slide on the rails 55, the booms moving in an arcuate path to a vertical position as shown in Figure l. During movement of the booms 113 to the vertical position, the dog 93 is in engagement with the ratchet wheel 8l, the spreader bar |05 during movement of the booms holds the top portions of the booms in spaced relation and serves as a support for the booms against the pull of the cables S attached at the bottom of the booms. During the upward movement of the booms the tongues 'i2 of elements l! are held in engagement with the teeth 73 of the rack bar plates 88 by the spring 8| and they serve as a support for the booms. The timber or girder as shown by dotted lines in Figure l, carried by the heads or cradles @il on the booms and secured in the heads by lock screws Bt, is now ready to be placed in the -ceiling of a mine or building. The nnal step in raising the timber or girder is accomplished by releasing the lock screws @5, then manually turning the wing nuts 6l in a clockwise direction, the lift screws 58 moving upwardly, and during this movement the shoes 5S slide in the channel irons lili and d5 that comprise the booms thus providing free and easy movement of the lift screws 58. After the timber or girder has been placed in position in a mine or the like, the wing-nuts are rotated in a counterclockwise direction, the lift screws moving downwardly.

When the lift screws are in retracted position, to move the booms from the vertical to the substantially horizontal position as shown in Figure 3, the link 'I5 is moved to the left, this moves links i8 and elements 'il and disengages the tongues 'I2 from the rack-bar plates 68, the elements being held in disengaged position by the safety hook lever 9|. When the link l5 is moved to the left, the element on the left side is pulled to the right, and the element on the right side is pulled to the left as shown by the dotted lines in Figure 1. Next the dog 93 is disengaged from the ratchet wheel 8l and the drum rotated in a counterclockwise direction. During this movement of s. the drum 33, cables wind around the .drum pulling the base of the booms toward the center of the base frame, cables lil unwinding from the drum 88, the booms being pulled to a full retracted position as shown in Figure 3.

In the operation ofthe modified form of the invention shown in Figures 10 and 1l, the movement of thev booms with the associated elements is the saine as previously described and hence it is believed only the operation of the threaded bars iid is necessary. In the operation of the modified form ci the invention, when it is desired to move the booms L53 to a vertical position, motion is imparted to the shaft l2 l, either manual or mechanical. This moves beveled gear i2? mounted thereon which is in mesh with gear 29, and this gear being in mesh with gears H9 on shafts iid rotates the shafts. As the shafts rotate, 'the threads on shafts It that are in engagement with the threads in bars Iii?, move the booms toward the ends 0f the base frame. When the booms are to be retracted, the shaft 52! is rotated in a counter-clockwise direction, the booms assuming the position as shown in Figure 3.

While the invention has been disclosed in connection with certain specific embodiments thereof, it is to be noted that these are by way of example rather than by way of limitations and that the invention is to be deiined by the attendant claims which should be given a scope as broad as is consistent with the prior art.

What is claimed is:

1. In a mine beam lifting jack a base, an elongated substantially horizontal element forming a tie bar, a pair of elongated spaced legs pivotally connected adjacent their upper ends to the tie bar for movement adjacent opposite ends thereof in spaced vertical arcuate paths from a substantially horizontal inactive position to a substantially vertical active position, means mounted on said base adjacent and operatively connected to the legs remote from the tie bar for moving said legs in the arcuate paths and means mounted adjacent the leg moving means and engaging the legs for stabilizing the legs as they move in the arcuate paths.

2. In a mine beam lifting jack a base frame, an elongated substantially horizontally disposed tie bar, a pair of elongated' spaced legs pivotally connected intermediate their ends to the tie bar for movement adjacent opposite ends thereof in spaced vertical arcuate paths from a substantially horizontal inactive position to a substantially vertical position, means mounted adjacent and operatively connected to the legs remote from the tie bar for moving said legs in the arcuate paths, brackets on said base frame, arms pivotally mounted to said brackets, and resilient tongues mounted on said arms adjacent the means for moving the legs and engaging the legs for stabilizing the legs as they move in the arcuate paths.

3. In a mine beam lifting jack an elongated substantially horizontally disposed tie bar, a pair of elongated spaced legs pivotally connected intermediate their ends to the tie bar for movement adjacent opposite ends thereof in spaced vertical arcuate paths from a substantially horizontal inactive position to a substantially vertical position, means mounted adjacent and operatively connected to the legs remote fromY the tie bar for moving said legs in the arcuate paths, resilient tongues mounted adjacent the means for moving the legs and engaging the legs for stabilizing the legs as they move in the arcuate paths, a support on said base frame, and means mounted on said support between the legs and operatively connected to the tongues for disengaging the tongues from the legs during the movement of the legs to inactive position.

4. In a mine beam lifting jack an elongated substantially horizontally disposed tie bar, a pair of elongated spaced legs pivotally connected intermediate their ends to the tie bar for movement adjacent opposite ends thereof in spaced vertical arcuate paths from a substantially horizontal inactive position to a substantially vertical position, means mounted adjacent and operatively connected to the legs remote from the tie bar for moving said legs in the arcuate paths, resilient tongues mounted between the legs to move in arcuate paths into and out of engagement with the legs, a support on said base frame, means mounted on said support between the tongues and operatively connected thereto for zontal inactive position to a substantially vertical position, means mounted adjacent and operatively connected to the legs remote from the tie bar for moving said legs in the arcuate paths, resilient tongues mounted between the legs to move in arcuate paths into and out of engagement with the legs, a support on said base frame, means mounted on said support between the tongues and operatively connected thereto for moving the tongues into and out of engagement with the legs, resilient means mounted adjacent the tongue moving means and operatively connected thereto for holding the tongues in engagement with the legs under yielding pressure, longitudinal rows of spaced teeth carried by the legs for successive engagement by the tongues, and means mounted beneath the tie bar and operatively connected to the legs for moving the legs in the arcuate paths.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 640,942 Peacock Jan. 9, 1900 1,254,527 Olson Jan. 22, 1918 1,774,926 Kruse Sept. 2, 1930 2,480,916 Gibson Sept. 6, 1949 2,512,534 Shaw, Jr. June 20, 1950 2,576,908 Wallace Nov. 27, 1951 2,591,475 Sullinger Apr. l, 1952

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