US1090836A - Spring-board. - Google Patents

Description

M. W. BUSH.

SPRING BOARD.

APPLIGATION FILED NOV. 22, 1912.

1,090,836. Patented Mar. 24, 191i 6 z 4 5 g'nuewt z MARSTON W. BUSH, OF WILLITS, CALIFORNIA.

SPRING-BOARD.

Specification of Letters Patent.

rammed Mar. 2a, 1914.

' Application filed November 22, 1912. Serial No. 732,973.

To all whom it may concern:

Be it known that I, MARSTON W. BUsH, a citizen of th United States, residing at \Villits, in the county of Mendocino and State of California, have invented new and useful Improvements in Spring-Boards, of which the following is a specification.

This invention relates to spring boards for use in felling trees; and has for its object the provision of a board of this char acter which may be attached to or removed from the tree with the minimum of time and labor; one which may b positively held against sagging under the weight of the lumberman; one which may be adjusted horizontally whereby it may be brought to any desired position with relation to that portion of the tree to be operated upon; and one which will include foldable portions adapted to be arranged in a flat compact package for shipment or storage.

Another object of the invention is to provide folding props, each including companion pivotally connected sections and. means interchangeably connected with the sections and with the board whereby to hold the sections operatively folded against one side of the board when the latter is not in use and to also hold the sections in effective prop position and against pivotal movement when the board is arranged upon the tree.

With these and other objects in view, the invention consists of certain novel features of construction, combination and arrangement of parts, as will be hereinafter described and claimed.

In the accompanying drawings :Figure 1 is a perspective view of the board, showing the application of the same to the tree; Fig. 2 is a plan view thereof, showing the boards folded; Fig. 3 is a horizontal section through a portion of the tree, showing the different horizontal positions of the board in full and dotted lines, respectively.

The platform 1 is provided with recessed sides 2, which are adapted to accommodate sustaining props 3. Each of these props comprises sections 4 and 5, which are pivotally connected together, as at 6. The sections 4 are connected to the platform 1 by a bolt 7 or the like, which preferably extends transversely through the platform adjacent to one end thereof. The sections 4 and 5 of the props are adapted to be folded on each other and to lie in the recesses 2 at the sides of the platform when the board is not in use or when it is desired to carry the same from place to place or to ship or store the same. When the prop sections are folded on each other and arrangedin said recesses 2, they are fixedly held to the platform through the medium of short bolts 8. These bolts are passed through alining recesses 9 and 10 in the prop sections 4 and 5 and as illustrated the bolts are extended through passages 11 in the recessed sides 2 of the platform and terminally confined in nuts 12. The nuts 12 ar mounted in rectangular recesses in the platform and they are adapted to be re moved from the recesses for a purpose to be hereinafter explained. The pivotally connected ends of the prop sections 4 and 5 are provided adjacent to their points of pivotal connection with alining apertures 13 through which the bolts 8 are adapted to be extended so as to hold said prop sections against pivotal movement when they are adjusted t0 the positions shown in Fig. 1. The sections 5 are provided with metallic spurs 14, which are adapted to be driven into the tree at points below the plane of the platform and to obtain such purchase as will warrant properly sustaining the platform and the weight of the operator. The opposite end of the platform is provided with a strap 15 having flanges 16 secured to the under side of the board and a hook 17 which extends beyond the end of the board so as to permit of its engagement with a retaining member 18. The retaining member is provided with a shank 19, which may be driven into the tree in line with the proper point of adjustment of the platform. The shank 19 is extended into a loop 20 and as shown one of the connecting bars of the loop is provided at suitable intervals with substantially U-shaped notches 21, which are concentrically disposed with relation to the trunk of the tree so that the hook may be engaged in a par ticular recess to retain any required horizontal positions of the platform. The tongue 22 of the hook 17 is springy so as to facilitate its connection with the retaining member 18 as is evident.

The props 3 of the device are of the same transverse thickness as the platform 1 so that their opposite upper and lower surfaces occupy the same general plane with the corresponding surfaces of the platform when the props are folded. The props are also of such configuration that when folded they lie wholly within the longitudinal plane of the platform. 7

Having thus described my invention, what I claim is A spring board for use in felling trees comprising a platform provided with longitudinal side recesses, props each including two sections co-extensive with th length of the recesses and pivotally connected together and foldable to lie wholly within the plane of the recesses, means for holding the prop sections against pivotal movement when e2;- tended to operative platform folding positions and operable also for engagement with the platform to hold both prop sections in folded positions against the sides of the platform.

In testimony whereof I affix my signature in presence of two witnesses.

MARSTON W. BUSH Vitnesses:

VVM. LEwIs B. V. SPRINGER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. C.

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