US2140617A

US2140617A - Adjustable scaffold

Info

Publication number: US2140617A
Application number: US148300A
Authority: US
Inventors: Castady Harry
Original assignee: Individual
Current assignee: Individual
Priority date: 1937-06-15
Filing date: 1937-06-15
Publication date: 1938-12-20
Anticipated expiration: 1955-12-20

Description

' 1938- H., CASTADY ADJUSTABLE SCAFFOLD Filed June 15, 1957 2 Sheets-Sheet v 1 Dec. 20, 1938 1-1., cAsTAbY ADJUSTABLE SCAFFOLD Filed June 15, 1957 2 SheecsSheet 2 PATENT OFFICE ADJUSTABLE SCAFFOLD Harry Castady, Chicago, Ill. Application-June 15, 1937, Serial No.'148,300

, I 7 8 Claims. invention relates to an adjustable scaffold. I It is an object of this invention to' provide an improved adjustable scaffold which is relatively 'eient'in use. a Another object of the present invention is to simple and inexpensive in construction and effie provide a new and improved adjustable scaffold for use by painters, paperhangers and other workmen, and by means of which the platform or iplanking of the scaffold may be adjusted verti- 'cally to various heights, as desired.

. An additionalobject'of the present invention is tocprovide a new and improved adjustable supporting and lifting device by means of which the planking or platform of the scaffold may be adjusted'to the desired vertical height.

Other objects will appear hereinafter.

The invention consists in, the novel combina- J tionaand arrangement of parts to be hereinafter described and claimed. I 'The invention will be best understoodby reference to the accompanying drawings showing the preferred form of construction, and in which: Fig. 1 is a perspective viewshowing a preferred formof the new adjustable scaffold;

- Fig. 2' is a fragmentary vertical sectional view showing a preferred form of the adjustable lifting andsupporting device which forms a part ofthe new scaffold;

Fig. 3 is a side elevational view of ;a;modified 7 form of the adjustable lifting and supporting device which is shown in Figs. 1 and 2;

Fig. 4 is a fragmentary side. elevational view illustrating another modified form of the new 3 adjustable lifting and supporting device;

I Fig. 5 is a view, on line 5--5 in Fig. 4, partlyin section and partly in top plan; and

,Fig. 6 is a perspective view of a modified form of the, new adjustable scaffold.

1 of four adjustable lifting and supporting devices I A preferred form of the new adjustable scaffold isshown in assembled position in Fig. 1, is therein generally indicated at I0, and comprisesa group which are generally indicated at II, and one of which is shown in detailin Fig. 2; and, oppositely extending planks I2 and I3 which are carried thereby and which form a platform or support for painters or other workmen, whenthe new scaffold. is in use.

Each of the adjustable lifting and supporting 1 devices II includes averticalstandardor column 7J4 and mounted on this column I4, at the upper end thereof, is a collar I8, into which is threaded a jack screw I5, Attached to the standard, I4

I ofeach of the devices II by means of a collar I6,

is a tripod of three braces I1 for holding the corresponding device in vertical position. Mounted on the column I4, adjacent the-upper end thereof, in any suitable manner, as by welding, is a supporting bracket I9. Rotatably mounted in this bracket I9 is a worm gear 29/, which is operable by a hand crank 2|, and this worm gear 20 is engageable with a worm screw 22 which is formed on the peripheral surfaceof the corresponding collar I8.

Mounted on the jack screw I5 of each of the adjustable lifting and supporting devices II, at the upper end thereof, and in any suitable manher, is a pair of aligned cross arms 23 for the receptionof an end portion of one of the longitudinally extending planks I3 of the platform, andalso mounted on the upper end portion of each jack screw I5 is a pair of cross arms 24 for the reception of an end portion of one of the transverse planks I3 of the platform. It is to be noted, in this connection, that the cross arms 23 are arranged somewhat abovethe cross arms 24, for reasons which will become apparent presently. q

Also mounted in each of the columns I4, in any suitable manner, is a series of vertically spaced steps 25 foruse by the workmen in climbing to the top of the scaffold, that is, up onto the platform of the same.

-In the use of the new scaffold the lifting and supporting devices I I are arranged at the corners of the platform of the proposed scaffold and the planks I2 and I3 are then laid in position of use, as shown, with the end portions of the transverse or cross planks I3 laid in the lower cross arms 24, and with the ends of the planks I2 laid in-the upper cross arms 23. The planks I2 and I3 may then be raised to the desired height of the platform by rotating the cranks 2| which act',,through the worm gears 20, to rotate the jack screws I5 and thus raise the latter and the cross arms 23-44; andthe planks I2--I3- carried thereby, up to the desired height of the platform, and this procedure may be reversed, that is,-the jacks I5 and their cross arms 23-24, and the planks I2--I3 carried thereby, may be lowered by rotating the cranks 2I in the opposite direction.

In this manner an efficient and relatively inexpensive adjustable scaffold is provided for use by painters and other workmen and which may be readily assembled and raised and lowered conveniently and with less time and labor than is required in the building of the scaffolds now in use,-and without necessitating the use of the very considerable amount of expensive lumber now used in the building of non-adjustable scafiolds, thus providing for economy in both time and labor.

Another advantage of the new scaiiold is that it may readily be taken. down and moved from place to place as required, and with much less time and effort, than is required to move the wooden scaffolds now in general use, while still maintaining the desired feature and advantage of its adjustability. v r

A modified form of the new adjustable lifting and supporting unit is shown in Fig. 3, is therein generally indicated at 26, and comprises a vertical standard or column 27 on which is mounted, in any suitable manner, acollar 28. Pivotally mounted at their upper ends on the collar 28, as at 29, are brace rods 36 each of which has telescoping engagement at its lower end in a tubular brace 3|. Each of these tubular braces 3| is pivotally mounted at its lower end, as at 32, in a base or pedestal 33, and each pair of the tubular braces 3| and arms 30 may be held in adjusted position by means of a pin 34 which is inserted through corresponding openings which are formed therein. In this form of the new lifting device each two of the adjustable braces 36-3| are interconnected by a pair of telescoping adjustable links 36 which are pivotally con.- nected, at their outer ends, as at 3?, to the tubular sections 3| .of the adjustable braces. Each pair of these links 3536 are held together, at their inner ends, by means of a pin 38 which is inserted through corresponding openings which are formed therein.

Threaded into the column 2l is an externally threaded tubular section 39, and a corresponding,

but smaller, tubular section 46 is threaded into this tubular section 39, and mounted on, this tubular section 40, at the upper end thereof, are cross arms 4| which are identical to the cross arms 23-44.

Mounted in the lowermost tubular section 21 are combination steps and hand grips 42 and additional combination steps and hand grips 43 may be mounted in the

tubular sections

39 and 40, in any suitable manner, as by being removably inserted into suitable openings which are formed in the same.

In the use of the modified form of the lifting and supporting device which is shown in Fig. 3, the braces 303| and links 3536 may be adjusted to the desired position, whereupon the

tubular sections

39 and 40 may be adjusted to the desired height by rotating the same in and relative to their complementary sections. Otherwise, the use of the modified form of lifting device which is shown in Fig. 3 is the same as'has been described hereinbefore in connection with the form of the lifting device which is shown in Figs. 1 and 2.

Another modified form of adjustable lifting and supporting device, for use in conjunction with the new scaffold, is shown in Figs. land 5, is therein generally indicated at 44, and comprises a vertical column or standard which has the form of a tubular section 45, and mounted on this tubular section 45 is a collar 46 to which are attached supporting braces or legs 41 which are arranged in the form of a tripod and are interconnected by' cross links 48. Slidably mounted in the lower tubular section 45 is a substantially cylindrical member 50 which is provided with a row of teeth, that is, a rack 5|, and engaging with this rack 5| is a pinion 52 which is rotatably mounted in a bracket 53, this bracket 53 being attached to the upper end portion of the tubular section 45,"and the pinion52 being operated by a crank 54. Pivotally mounted in the bracket 53, as at 55, (Fig. 4) is a latch dog 56 and this latch dog 56 is engageable'with the pinion 52 so as to latch the same and the crank 5| against retrograde movement.

In the use of the modified form of lifting device which is shown in Figs. 4 and 5 the upper sections 5|] may be raised and lowered, relative to-the lower sections 45, so as to raise or lower the platform,

' such as is shown in Fig. l, by merely rotating the cranks 54, thereby causing the pinions 52 to engage with the racks 5|, and the upper sections 56 may be held in their desired adjusted position by engaging the latch dogs 56 with the pinions 52.

A modified form of the new adjustable scafiold is shown in Fig. 6, is therein generally indicated at 51, and comprises a pair of adjustable lifting and supporting devices 58 which are identical in construction and in operation to the lifting devices H which are shown in Figsl and 2, and hence need not be described in detail here, except thateach of the devices 58 is provided with only one pair of cross arms 59 for the reception of the corresponding end portion of the planking or platform 60.

It will be noted that this form of the new adjustable scaffold, which is shown. in Fig. 6, is particularly adapted for use by painters, paperhangers, and other workmen, in small rooms, apartments, and the like Where a scaffold having a single plank platform is desired.

While three of the lifting and supporting devices I are shown as being embodied in the form of the new scafiold which is shown in Fig. 1, it'is understood that this number may be varied and that additional devices I I may be used, if desired, for the purpose of supporting the scaffold planks or platform, and that three or more of the devices 58 may, if desired, be used for supporting the platform shown in the modified form of the device which is illustrated in Fig. 6.

While I have illustrated and described the preferred form of construction for carrying my invention into effect, this is capable of variation and modification, without departing from the spirit of the invention. I, therefore, do not Wish to be limited to the precise details of construction set forth, but desire to avail myself of such variations and modifications as come within the scope of the appended claims.

Having thus described my invention, what I arms will support, in superimposedrelationship,

the rightangularly intersecting end portions of platform or scaifold planks carried thereby and each of said devices including means for raising and lowering the corresponding one of said adjustable members and the said cross arms thereon.

2. Ascaffold comprising, in combination, a sub- 7 stantially rectangular platform consisting of a planks, one of the said cross arms on each of said members being arranged above the other one of said cross arms so that each pair of the said cross arms will support, in superimposed relationship,

the rightangularly intersecting end portions of 7 platform or scaifold planks carried thereby and eachof said devices includingmeans for raising and lowering the corresponding one of said adjustable members.

3. A scaffold comprising, in combination, a

' platform consisting of a plurality of planks, and a plurality of devices for lifting and. supporting justable members havingtwo pairs of cross armsthe said platform, each of said devices including a'vertically adjustable member, each of said adthereon for supporting end portions of said planks, one of the said cross arms on each of said members being arranged above the other one of said cross arms so that each pair of the said cross arms will support, in superimposed relationship, therightangularly intersecting end portions of platform-or scafiold planks carried thereby and each of said devices including means for raising and lowering the said adjustable members and the said cross arms thereon.

4. A scaffold comprising, in combination, a su 'stantially rectangular platform consisting of a Y plurality of planks, a device arranged at each corher of the said platform, and below the latter, for

supporting the same, each of said supporting derelationship, the rightangularly intersecting end portions of platform or scaffold planks carried thereby and each of said devices including means for raising and lowering the corresponding one of said adjustable members.

5.15. device for supporting aplank scaffold or the like comprising a base and a member adjustably-mounted thereon for vertical movement relative, thereto, said adjustable member having a pair of cross arms thereon at the upper end thereof for supporting an end portion of a scafiold plank, one of the said cross arms on each of said members being arranged above the other one of said cross arms so that each pair of the said cross arms will support, in superimposed relationship, the rightangularly intersecting end portions of platform or scaffold planks carried thereby and means for raising and lowering the said adjustable member and the said cross arms thereon.

6. A device for supporting a plank scaffold or the like comprising a base and a member adjustably mounted thereon for vertical movement relative thereto, said adjustable member having two pairs of cross arms thereon at the upper end thereof for supporting end portions of oppositely extending scaffold planks, one of the said cross arms on each of said members being arranged above the other one of said cross arms so that each pair of the said cross arms will support, in superimposed relationship, the rightangularly intersecting end portions of platform or scaffold planks carried thereby, and means for raising and lowering the said adjustable member and the said cross arms thereon.

7. A device for supporting a plank scaffold or the like comprising a base and a member adjustably mounted thereon for vertical movement relative thereto, said adjustable member having a pair of cross arms thereon at the upper end thereof for supporting the end portion of a scaffold plank, one of the said cross arms on each .of said members being arranged above the other one of said cross arms so that each pair of the said cross arms will support, in superimposed relationship, the rightangularly intersecting end portions of platform or scaffold planks carried thereby and means for raising and lowering the said adjustable member and the said cross arms thereon, said means including a worm gear mechanism, and a hand crank for operating the latter.

8. A device for supporting a plank scaffold or the like comprising a base and a member adjustably mounted thereon for vertical movement relative thereto, said adjustable member having a pair of cross arms thereon at the upper end thereof 'for supporting end portions of oppositely extending scaffold planks, one of the said cross arms on each of said members being arranged above the other one of said cross arms so that each'pair of the said cross arms will support, in superimposed relationship, the rightangularly intersecting end portions of platform or scaifold planks carried thereby and means for raising and lowering the said adjustable member and the said cross arms thereon, said means including a worm gear mechanism, and a hand crank for operating the latter.

HARRY CASTADY.