Патент USA US2407656код для вставки
Sept. 17, 1946. 1'. G. Dl sANTi SGAFFOLD 2,407,655 , . Filed May 3, `1945 4 Sheets-Sheet l ÍNVENTOR. Thomas G. 0:1 Santi ATTO kusss Sept. 17, .1946.` _T'. G. DI lSANTI -„ scAFFoL? Filed May 5, 1945 ' 2,407,655 _ ` ' > ' 4 Sheets-Sheet 3 l\ \` K’ ÍNVE-NTOR. ` \ Thomas G. Dl.' Sanft' F > BYGLLUJWäW'M ATToRNEss ` Patented Sept. 17, 1946 . 2,407,655 UNITED STATE s PATENT OFFICE 2,407,655 SCAFFOLD Thomas G. Di Santi, Newark, N. J. Application May 3, 1945, Serial N0. 591,686 5 Claims. (Cl. 304-18) 1 i -This invention relates to scaffolds and refers, more particularly, to adjustable scaifolds which can be used in ‘building operations and for other Figure 4; Figure 1; lowered at will. An object of the present invention is `the pro vision of a scaffold which is simple in construc tion and inexpensive to manufacture and which can be conveniently utilized in building oper ations of various types. `Another object is the provision of a scaffold which is reliable and safe in operation and which Figure 1; be caused by any negligence in operating the scaffold. ’ Yet another object is a provision of a scaffold which is provided with a continuously operating braking means holding the scaffold, the scaf fold being movable only when these means are maintained in a released position. Still another object is the provision of a con veniently operated locking device which may be used to facilitate continuous movement of the , Figure 6 is a section along the lines E-B of kinds of work and which are so constructed that the platform of the scaffold can be raised and is so constructed that no serious accidents can 2 Figure 5 is a section along the line 5-5 of ' ‘ Figure 7 is a section along the lines ‘I-l of Figure 8 is a detail view illustrating the lever Vwhich operates the brake mechanism. The scaffold frame shown in the drawings con sists of four rigid frame‘elements B, 9, III, II, at tached permanently to two sleeves I2. I3, sliding over two vertical posts I4, I5. Two other posts carry a similar scaffold frame (not shown). The ñooring of the scaffold, which is also not shown, extends between the two scaffold frames. The scaffold frame is prevented from sliding down the vertical rods I4, I5 by two brakes shoes I6, I 'I, made of wear resistant material and in contact with vertical rods i4, l5, through opene 20 ings I8, IB, provided in the sleeves l2, I3. The brakes I 6, I'I are held in position by two bars 2li, 2l having a common swivel joint on pinion 22 in the center of rigid members 8 and Il] at an equidistant point between sleeves I2; I 3. A '.25 U-shaped hanger 23 is connected to the frame members 8 and Ill by any suitable means and is used for hooking the block and tackle ropes speciñcation. 'I0 to hoist the scaffold. In accomplishing the objects of the present It is apparent that the scaffold as a Whole invention, it was found desirable to provide a [3 will have a normal tendency to exert pressure upon brakes I6, I'I causing these latter to be scaffold having brake shoes which ,are urged Scaiîold. Other objects of the present invention will become apparent in the course of the following by springs to press continuously against the posts of the scaffold and thereby hold it securely in position. The brakes are released through the come wedged firmly against vertical posts I4, I5. The links 20 and 2l are connected 'to the brake shoes I6 and I'l with a certain amount of play. The wedging action is further increased by ten manipulation of a lever which can :be locked in ; sion of springs 24, 25 through a system of con an inoperative position through the use of a suit necting links 26, 2'! mounted at one end on pinions able locking device. 28, 29 on brakes I6, Il, and at the other end on The invention will appear more clearly from pinions 30, 3l in folding arms 32 and 33. Arm the following detailed description when taken in connection with the accompanying drawings 40 32 has one end fastened to a pinion 34 at the lower end of sleeve I2. The other end of Verti showing, by way of example, a preferred em cally folding arm 32 is fastened to the end of bodiment of the inventive idea. ` spring 25. Thus the tension of spring 25€ exerts p In the drawings: a constant vertical pull upon arm 32. This pull Figure 1 shows ‘a scaffold in front elevation is developed into pressure through the lever with the brakes in the operative locking posi 45 formed by the relative position and swinging con tion; nections of the link 25 connecting armi 32 to Figure 2 is similar to Figure 1 and shows the brake IS and'fastened by pinions 28, 3Q. The scaffold with the brakes locked in the inoperative pressure developed in this lever arrangement in* position; ` 50 creases the pressure of brake I 6 against its verti Figure 3 illustrates in front elevation the rope cal post I4, thereby firmly holding the scaffold supporting means which are used to operate the in a stationary position. The upper ends of scaffold; springs 24, 25 are fastened to the transverse frame Figure 4 is a side view of the device shown in element I0. The purpose of these springs is to' Figure 3; 55 exert pressure on the- brakes I6, Il, as above 2,407,655 3 4 mentioned, through levers and links 32, 26, and 33, 2l. locked and the scaffold is prevented from> sliding down the vertical rods I4, I5. . It may be noted that spring 24 on the left hand The self wedging action of brakes I6, I'l is an side of the drawings (looking in the direction of important feature of the present invention en Figure l) blocks brake Il on the right hand side abling the operator to anchor the scaiiold easily and safely at any height desired. This invention' provides safe, eñicient and of this drawing and that spring 25 on the right hand side of the drawing blocks brake I6 on the practical means to enable one person to hoist or left hand side of this drawing. The entire mechanism operates simultaneously lower the novel scaffold herein described with a and is intended to distribute an equal pressure 10 minimum of efforts and with a maximum ease of control due to the automatic self wedging brake on brakes I5, I'I under tension of springs 24, 25 upon arm 32 mounted on pinio-n 34 and arm 33. . actions involved. It is apparent that when the lever 49 is swung mounted on pinion 35. about the pivot 35 from the locking position The transversal supporting beam or frame ele ment II has one of its ends fastened to slidingY 15 shown in Figure 1 to the unlocked position shown in Figure 2, the nose 39 is raised from the bar 50 sleeve I2, while the other end is fastened to provided that the bar 5U at that time is in the sleeve I3. ` Beam II is provided with a pinion 36 upon . position shown in Figure l. Usually the operator will raise Vor lower the which fulcrums a lever 3l' carrying a pulley Wheel 38 resting upon the upper edges of folding arms 20 scaffold by pulling at the rope 'I3 while holding the lever 4S in its open position through the 32, 33 and causing a downward’ swing of 'these application of hand or foot pressure. arms. The nose 39 of this lever may rest against a locking bar 5B fastened to a ratchet wheel 45 In certain instances, however, it is desirable t0 maintain the lever 49 in its o-pen position. The rotatably mounted on pinion 4I. One end of an bar 53 which is used for this purpose can be con arm 42 _pivots on pinion 4I, while its other end 43 is pulled vertically upward byspring 44 fas veniently swung into its locked position by pulling tened at point 45 on upper beam or frame I3. This upward motion displaces a pawl 45 mounted on pinion 4l on arm 42 and having a sharp point 48 which engages into a tooth of ratchet wheel at the cord 'Il which is attached to the lever 42 45, thus preventing the counter-clockwise rota ing the spring 44. tion of the ratchet wheel 40 (looking in the direc- ` In the coursev of lthis swinging motion the pawl 43 will press against the ratchet wheel 40 and will rotate this wheel along with the bar 50 which tion of Figure l). ~ A hand or foot operated release lever 43 has the form of a hollow frame and is firmly attached to the lower end voi lever 3l, thus forming a at 43, . ’ If the cord ll is pulled it will cause the lever 42 vto swing about the pivot 4i thereby expand ' f is ñrmly attached thereto. . As a result of this rotation the bar 52 will be permanent right angle'with the lever 3l. moved to position shown in Figure 2 in which the The ratchet wheel 45 rotates along with the locking bar 5I] which is firmly connected thereto .and which has rounded ends 52 'and 52a of this nose 39. arm coming intermittently in contact with a con cave section 38a at lever 3l'. The scaiïold is hoisted by a block and tackle end 52 of the bar 54 is in engagement with the ` As soon as pressure on the cord 'II is released the spring 44 contracts and will swing the linkV 42 about the pivot 4I Vwhile the pawl 46 will slide over the teeth of the ratchet 43. A spring (not shown) may be used to facilitate the insertion of running from hook’23, shown in Figures 1 and 2, to hook 53 in Figure 3, fastened by bolts 53a on a 45 the pawl 4B into engagement with an adjacent beam 54. The beam 54 slides up or down on the tooth of the ratchet 45. ` It is apparent that if pressure upon the outer tion by clamps 55, 56 which are tightened by end of the lever 43 is released at that time',- the pressure of the springs 24 and 25 will merely screw handles 5l, 53. As shown in Figure 5, each of the clamps 55 50 strengthen the engagement of the nose 39 with vertical rods I4, I5 and is held in a steady posi or'55 consists of two semi-circular jaws 59, 5@ the bar 50. ' fitting closely around rod I5. Jaw Ell is adjusted In order to release the lever 49 and to cause the brake shoes I6 and Il to press against the by turning screw handle 58 and is held in posi posts I4 and I5 it is merely necessary to move the tion by two sliding bolts 62 and 53. The described scaffold is operated as follows: 55 bar 50 out of engagement with the nose 33 in the manner hereinbefore described. The brakes are unlocked to allow the hoisting or It is apparent that the described scaffold pro the lowering of this scaffold by pushing down vides a simple and eiîectively operating construc the upper end 43a of control lever 49. The action tion by means of which the frame of the scaffold of the mechanism is as follows: When lever 49 is always maintained in its locked position upon 60 is pushed down along with the lever 3l, the -pulley the posts so that there is no danger that ac wheel 38 riding along the upper edges of folding cidents may be caused as the result of a negligent arms 32, 33 will describe a downward curved operation of the scaffold. motion involving pressure of this wheel upon It is furtherV apparent that the illustration arms 32, 33 and causing these latter to fold down 65 shown above has been given solely by way of il wardly while pulling down link arms 26, 2l' fas lustration and not by way of limitation and that tened on brakes I6, I "I, thus'causing these brakes the described construction is subject to wide to be displaced away from their points of friction variations and modifications without exceeding on vertical rods I4, I5. the scope or intent of the present invention; all When control lever 49 is released, springs 24, 70 Vof such variations and modiñcations are to be 25 pull up folding arms 20, 2| and arms 32, 33 included within the scope of the present'inven to their original position. During this motion tion. lever 3l swings downward >around its pinion 35 Y > What is claimed is: . ‘ > 1. In a scaffold, in combination with a post, a the locking bar 50. Then the brakes I6, I'I are 75 sleeve slidable upon said post, a brake adapted and presses down its concave curved nose 39 on 5 2,407,655 to engage said post, a link having an end pivoted to said brake, an arm pivoted to said sleeve, said link having another end pivoted to said arm in termediate the ends of the arm, a frame element carried by said sleeve, a spring carried by said frame element and connected with said arm for maintaining said brake in engagement with said 6 , bers having ends pivotally connected to said brakes and other ends pivoted to said upper frame, links having ends pivotally connected to said brakes, two arms extending side by side and> having opposed ends pivotally connected to sepa rate sleeves, said links being pivotally connected to separate arms intermediate the ends of the post, a lever, and means connected with said lever arms, springs having upper ends connected to and engaging said arm for releasing pressure upon said upper frame element and lower ends con said brake when said lever is actuated. li) nected to the other ends of said arms, wherebyl 2. In a scaffold, in combination with a pair of said brakes are maintained by said springs in en posts, sleeves slidably mounted upon said posts, gagement with said posts, a lever swingably at least one upper frame element extending be mounted upon said lower frame element, and a tween said sleeves and ñrmly connected thereto, roller carried by said lever and engaging said two at least one lower frame element extending be arms, said roller depressing said arms to release tween said sleeves and ñrmly connected thereto, pressure upon said brakes when said lever is said sleeves having recesses therein, brakes swung. A adapted to engage said posts in said recesses, links having ends pivotally connected to said 4. In a scaffold, in combination with a post, a brake adapted to engage said post, means for brakes, two arms extending side by side and hav 20 pressing said brake against said post, a lever con ing opposed endspivotally connected to separate nected with said means and movable to a releas sleeves, said links being pivotally connected to ing position for releasing pressure upon said separate arms intermediate the ends of the arms, brake, said lever having a free end, a ratchet springs having upper ends connected to said upper frame element and lower ends connected to 25 wheel, a pawl-carrying lever, means supporting said ratchet wheel and said pawl-carrying lever the other ends of said arms, whereby said brakes for rotation, a pawl upon said pawl-carrying lever are maintained by said Vsprings in engagement for engagement with said ratchet Wheel to turn with said posts, a lever swingably mounted upon the ratchet wheel in one’direction, and a locking said lower frame element, and a roller carried by bar ñrmîy connected to said ratchet wheel and said lever and engaging said two arms, said roller 30 rotatable therewith to a position wherein it locks depressing said arms to release pressure upon said said releasing lever in its releasing position. brakes when said lever is swung. 5. In a scaffold, in combination with a post, 3. In a scaffold, in combination with a pair of a sleeve slidable upon said post, a brake adapted posts and rope-actuated hoisting means thereon, to engage said post, a link having an end pivoted sleeves slidably mounted upon said posts, at least to said brake, an arm pivoted to said sleeve, said one upper frame element extending between said` link having another end pivoted to said arm in sleeves and ñrmly connected thereto, at least one termediate the ends of the arm, spring means lower frame element extending between said connected to said arm for maintaining said brake sleeves and Iirmly connected thereto, said sleeves in engagement with the post, and leverage means having recesses therein, brakes adapted to engage 40 in operative connection with said arm for releas said posts in said recesses, a rope-engaging ele ing pressure upon said brake when said leverage ment carried by said upper frame element for means is actuated. hoisting the scaifold, elongated connecting mem THOMAS G. DI SANTI.