US288651A - Michael millbe - Google Patents

Description

- (7N6 Model. M. MILLER.

' 'TRESTLE. No. 288,651. Patented Nov; 20, 1883. r

. MICHAEL-MILLER, or GLENWOOD, Iowa. 1 Q

""TRESTLEY srncrn cn'rron forming part of Letters Patent No. 288,651, dated November 2o, 1jsi3'.

Application filed March 26,-1883. {No.inodcl.) i

To aZZ whom it may concern.-

.Be it known that I, MIOHAELMILLER, a citizen of the Unit'ed'States, residing at Glenwood, in the county of Mills and State of Iowa, have invented a new and useful Trestle, of which the following is a specification.

2 My invention relates to improvements in trestles; and the objects of my invention are,

first, to permit the trestle to be adjusted to different heights and lengths, without changing any of its parts, by merely altering the relative position of the parts; second, to permit the trestle to be adjusted to different heights by :ehanging the legs and then altering the relative position of the parts; third, to per mit trestles to be constructed with less timber and materials, and to permit their use without injury to the materials, and to preserve the full strength of the, same; fourth, to permit trestles to be constructed without nails or carpenters work; fifth, to permit trestles to be conveniently taken apart without injury to any part thereof; sixth, to permit trestles to be easily put into small compass or space, without injury thereto, for convenient removal, packing, transportation, or storage; seventh, to reduce the material requisite for the practical use of trestles; eighth, to secure immunity from accidents by the breaking or crushing down of trestles. I attain these objects by the mechanism illustrated in the accompanying drawings, in which Figure 1 is a View in perspective of the several parts of the adjustable trestle combined and set ready for use. It may be made of any desired length horizontally by changing the putlog or cross-piece D. j

Fig. 2 is aview in perspective of the metallic trestle-head A, showing the slot to receive and support the putlog or cross-piece D of the trestle; the pin-holes W, for fastening the putlog thereto, if desired; the pin or projection G to prevent the putlog working out of the slot; the shoulders O to meet the corresponding shoulders of the leg-sockets B; the slot H to receive the key 0; the jaws M to support the. pntlog, and the circular hinge-bearing J to enter the adjustable leg-sockets B, and to be position.

secured thereto by a pivot, if desired.

Fig. 8 is a perspective view of one of the hinge leg-sockets of the trestlehead, showing the circular top fitted to receive the circular bearing of the part A, with slots 'i to receive the keyO and hold the parts in adjustment; the shoulder O; the pin-hole K to admit the fastening the leg L thereto, and the hook P to the top of the slot H, clears the upper part of 6 the leg-socket B, and which, when it rests in the slots 2'', also projects into the slots H and holds the legsockets B and the head A in adjustment.

Fig. 5 is a perspective view of the metallic trestle-head A attached to the adjustable legsockets B by apivot at J, showing the several parts lettered, as hereinbefore described. Near the lower end of the adj ustable legsockets B are made hooks or projections P to receive a chain, N, adjustable to any desired length, to hold the legs L at agiven distance apart, such distance being ascertained by so adjusting the legs and key 0 as to raise the head A to any desired height, and to diminish the strain upon the key G and the pivot J,

arising from actual operation of the trestle. It also shows, without lettering, a pin to hold the putlog, inserted in the pin-holes 7. (Shown in Fig. 2.)

Fig. 6 is a perspective of one of the trestlelegs removed from the leg-sockets B,with triangular brace S, attached by pins, bolts, or screws n, to the foot and upper portion of the leg.

Fig. 7 is a vertical section of the trestlehead A, attached to the leg-sockets 13, showing the sockets L, and showing by the dotted lines the head and leg-sockets adjusted to a different The drawings show the two extremes of adjustment when the parts are placed upon legs of any given length.

Similar letters refer to similar parts throughout the several views, except that J refers both to the hinge-bearing of the trestle-head A and to the hinge-bearing of the leg-sockets B.

My inventionis designed to remedy the practical difficulties and expense of constructing trestles for scaffolds for all purposes, encountered when it is found convenient or necessary to change the height or position of the same ICO in .actualuse. It is also designed to permit their convenient removal from one place to another without injury or rebuilding and without loss of time in so doing. It is also designed to preserve the maximum strength of material composing them, and to permit trestles to be taken to pieces, stored conveniently, and again erected without any loss of material or injury to or diminution of their component parts. It is also designed to admit of trestles being accu-' rately adjusted to any desired height required for the economical performance of all kinds oflabor upon them. mit trestles to be used upon sloping ground by using legs of different lengths, as well as by adjustment. The head, legsockets, and key are of metal, the triangular braces of either wood or metal, and the putlog and legs of wood. Its use and operation are like those of other trestles, except in the manner of erecting, tak- By using legs ing down, and storing them. and cross-pieces (putlogs) of different lengths the trestles may be made of any desired length or height. If it is desired to make any moderate adjustment of height, it may be done by unhooking the chain N, raising the key Ginto the top of the slot H, and increasing or diminishing the distance between the lower ends of i one to the same height as the old one, and putting on additional plank. By putting other trestles under ascaffold which is being used it maybe safely raised or lowered without even stopping the workmen.

My trestle can be conveniently used in a nar- Itis also designedto'perrowhall or a wide buildingbymerely using putlogs of different lengths. It can be easily taken apart for storage or transportation, and with ordinary use will last indefinitely. The manner of its construction will be readily seen by reference tothe several drawings. What I claim as my invention, and desire to secure by Letters Patent, is

1 The combination of the key 0 with head A,having slot H, leg-sockets B, havingslots z, and the pivots J as and for the purpose shown and described. v

2. The adjustable leg-sockets B, with circularhingebearing J, pivoted and fitted to3re-' ceive the hinge-joint J of the trestle-head'A,

with horizontal slots i, pin-holes'K,"shoulders O, hollow space L, to receive the leg, hook P,

and adjustable chain N, combined with the me ltallic' trestle-head A and the metallic key 0,

all constructed substantially as described.

3. The metallic key 0, in combination with the head A, having the slot H, the leg-sockets 2B, having the slots 1, and the pivot J, said key ;being adapted to be entered in the slot Hand jengaged with the slots 2' before the head and ,sockets are connected by the pin, as and for the purpose shown and described.

, 4. The combination of the metallic trestlehead A with the metallic key 0 and the adjustable leg sockets B and the triangularbraced legs L, all constituting, essentially, the improved trestle herein described, and all constructed substantially as described, andfor the purpose specified.

* I MICHAEL MILLER.

Vitnesses: WM. TURNER,

M. :H. MoGLUsKnY, WV. F. OTIS.

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