Device and method for enabling wheelchair users to propel curling stones

Abstract

A curling stone propelling device for use by a person with limited arm strength and mobility where a deceleration of a wheelchair is a triggering event that propels a curling stone with an adjustable and measurable force where the propulsion of the stone is provided by tension bands that when under pressure can cause the stone to be propelled with a known force.

Description

CROSS REFERENCE TO RELATED APPLICATIONS

[0001] The present application claims the benefit of the filing date of provisional patent application having Ser. No. 64 / 002,873 filed on Mar. 11, 2026 and the provisional patent application having Ser. No. 63 / 770,189 filed Mar. 11, 2025 by the same inventor, which application is incorporated herein in its entirety by this reference.FIELD OF THE INVENTIONBackground of the Invention

[0002] The present invention relates generally to a wheelchair attachment configured to provide assistance to facilitate meaningful participation by a person in the wheelchair in the sport of curling.

[0003] Curling is a strategic team sport played on ice where players slide granite stones toward a target area to score points based on final stone positions. The sport requires precise control of both throw weight (propelling force) and stone rotation to achieve desired outcomes, with teammates often sweeping the ice to influence stone trajectory and distance.

[0004] Traditional curling involves players using their arms and wrists to propel stones down the ice sheet, imparting rotation during release to control the stone's curl direction. However, individuals with limited or no arm function, such as quadriplegics, have been unable to participate in this aspect of the sport using conventional techniques.

[0005] Some adaptive equipment exists for wheelchair users, such as delivery sticks operated by arm movement. Some of these delivery sticks have even had delivery stick head configurations to provide the capability to impart rotation on the stone. While these delivery sticks, with or without rotation inducing heads, are popular for some participants, they, are inadequate for individuals with severe upper body limitations.

[0006] Consequently, there remains a need for a device that enables persons with little or no arm function to competitively propel curling stones with similar precision and control as is normally available to fully able-bodied players.

[0007] The present invention addresses this need by providing a device that translates human inputs on the wheelchair movement into precise stone throws, allowing users with severe physical limitations to participate competitively in curling alongside able-bodied teammates while maintaining the strategic precision and competitive integrity that characterizes the sport, as well as provide the user opportunities for social interaction and a feeling of success by achieving difficult task through their own skill.SUMMARY OF THE INVENTION

[0008] It is an object of the present invention to provide a device that enables wheelchair users with limited or no arm function to competitively propel curling stones with precision and control comparable to able-bodied players.

[0009] It is a feature of the present invention to utilize wheelchair deceleration as a trigger mechanism for stone release without requiring hand or arm function.

[0010] It is an advantage of the present invention to provide intuitive control where natural wheelchair movement directly triggers stone release at the precise desired moment.

[0011] It is another object of the present invention to replicate the results of the wrist action of traditional curling delivery; for wheelchair users, who cannot perform such movements.

[0012] It is another feature of the present invention to include a handle assembly with a spring-biased rotatable cradle that imparts either clockwise or counterclockwise rotation to the curling stone upon release.

[0013] It is another advantage of the present invention to enable wheelchair users to achieve the same stone rotation control and curl characteristics (the curve-shape of the path of a stone, in motion, as it travels over the ice); as able-bodied players.

[0014] It is yet another feature of the present invention to provide an adjustable force regulator comprising tension bands selectively tension able to an infinite number of different force applications.

[0015] It is yet another advantage of the present invention to allow precise throw weight control through selection of tension band combinations, numbers, and attachment positions.

[0016] It is yet another advantage of the present invention to be able to digitally measure the amount of force that will be imposed on the curling stone when the device is fired.

[0017] It is still another feature of the present invention to include stone arms that provide progressive resistance during initial stone propulsion.

[0018] It is still another advantage of the present invention to minimize recoil against the wheelchair while ensuring efficient energy transfer to the curling stone.

[0019] It is even another feature of the present invention to provide a momentum-activated trigger mechanism with adjustable sensitivity.

[0020] It is even another advantage of the present invention to accommodate users of varying capabilities and wheelchair operating characteristics.

[0021] It is finally another feature of the present invention to include a wheelchair interface with capability for quick disconnection of the wheelchair from the most substantial and significant portion of the present invention to maintain game pace without interfering with other players or damaging equipment so that the user may participate in the same game with more able-bodied players.

[0022] The present invention is designed to achieve the above-mentioned objectives, include the previously stated features, and provide the aforementioned advantages.

[0023] In one embodiment, the device may include the following components and features:EXEMPLARY EMBODIMENTSA. Overall Device Architecture

[0024] According to one embodiment, a device for enabling wheelchair users to propel a curling stone comprises a device handle configured to engage a handle of the curling stone, stone arms configured to hold the curling stone in position, a ram configured to transfer kinetic energy to the curling stone, a force regulator configured to provide infinitely adjustable kinetic energy to the ram, a trigger mechanism configured to selectively release the ram which is responsive to a reduction in wheelchair speed, and a wheelchair interface configured to attach the device to a wheelchair. In this configuration, wheelchair movement is translated into controlled and repeatable stone propulsion, enabling users with limited or no arm function to participate competitively in curling.B. Wheelchair Attachment and Structural Backbone

[0025] According to an embodiment, the chair mount comprises an extension configured to interface with wheelchair footrests, adjustable skids configured to receive front wheels of the wheelchair, and attachment means configured to secure the wheelchair to the device. This mounting arrangement accommodates a range of wheelchair designs while providing stable alignment and rapid attachment and detachment during play.

[0026] According to an embodiment, the device further comprises ram assembly configured to function as a structural spine holding system components in fixed relation to one another, a ratchet mechanism configured to provide infinitely adjustable force provisionment, and a safety system configured to prevent unintended release of the ram during non-shot taking time periods.C. Energy Storage and Transfer

[0027] According to an embodiment, the force regulator is configured to be selectively adjusted to infinitely variable strengths to control a propelling force applied to the curling stone. This analog configuration allows fine tuning of throw forces to match the strategic requirements of competitive curling.D. Trigger and Momentum-Activated Release

[0028] According to an embodiment, the trigger mechanism comprises a frame configured to pivot between open and closed positions, rollers configured to interface with the ram cleats to prevent ram movement when in the closed position, a hammer actuator configured to actuate trigger release in response to wheelchair deceleration, and a safety mechanism configured to prevent unintended activation. This arrangement provides intuitive user control while maintaining operational safety.

[0029] According to an embodiment, the actuator comprises a tube containing a ball and a stop positioned such that, upon deceleration of the wheelchair, momentum causes the ball to travel forward and impact the stop, thereby moving the trigger mechanism to the open position. This design converts natural wheelchair stopping motion directly into precise trigger timing without requiring hand or arm actuation.E. Stone Positioning, Stability, and Recoil Management

[0030] According to an embodiment, the stone arms comprise rollers configured to interface with a outer edge of the curling stone, extension arms configured to maintain system and stone alignment, and a resilient member configured to pull the extension arms inward to center the curling stone. These features automatically align the stone while imposing resistance during initial propulsion to reduce recoil against the wheelchair and improve delivery accuracy and user comfort, while simultaneously permitting easy front loading of the stone by merely pushing into the extension arms until positioned to be pulled into the terminal end of the ram.F. Stone Handle Engagement and Curl Control

[0031] According to an embodiment, the handle comprises a cradle having a concave interface configured to engage the curling stone handle, a frame configured to hold the cradle in position relative to the stone, and a spring configured to impart rotation to the curling stone upon release. This configuration replicates wrist-driven rotation used in traditional curling delivery and enables controlled stone curl.

[0032] According to an embodiment, rotation is imparted to the curling stone as the stone separates from the handle assembly, enabling competitive-level curl characteristics without requiring arm or wrist motion by the user.G. Method of Use

[0033] According to an embodiment, a method for enabling a wheelchair user to propel a curling stone comprises providing a device having a handle, stone arms, a ram, a force regulator, a trigger mechanism, and a wheelchair interface; attaching a wheelchair to the device via the wheelchair interface; positioning a curling stone on the ice with the device located behind the stone; configuring the force regulator to provide an infinitely adjustable and digitally measured to a desired amount of propelling force; operating the wheelchair to align the device along a shot line; moving the wheelchair forward and decelerating at a selected position to cause momentum-activated trigger release; and allowing the force regulator to precisely propel the curling stone forward.

[0034] According to an embodiment of the method, deceleration of the wheelchair causes a ball within a actuator ball tube to move forward and impact a stop, thereby opening the trigger mechanism.

[0035] According to an embodiment of the method, resistance imposed by the stone arms during initial ram movement reduces recoil against the wheelchair.

[0036] According to an embodiment of the method, rotation is imparted to the curling stone during separation from the handle assembly.H. Device and Method Aspects of the InventionH1. Device Aspect

[0037] According to one aspect of the invention, a device for propelling a curling stone by a wheelchair user having limited arm function comprises:

[0038] a handle assembly configured to releasably engage a curling stone and impart rotation upon release;

[0039] stone arms configured to stabilize the curling stone and impose resistance during initial propulsion to reduce recoil;

[0040] a ram configured to transfer kinetic energy to the curling stone;

[0041] an infinitely adjustable force regulator configured to vary an amount of kinetic energy transferred to the curling stone;

[0042] a trigger mechanism configured to selectively release the ram in response to deceleration of a wheelchair; and

[0043] a wheelchair interface configured to releasably attach the device to a wheelchair.H2. Method Aspect

[0044] According to another aspect of the invention, a method for propelling a curling stone using wheelchair movement comprises:

[0045] providing a device having a handle assembly, stone arms, a ram, an adjustable force regulator, a trigger mechanism, and a wheelchair interface for releasably attaching a wheelchair to the device;

[0046] positioning a curling stone relative to the device with a selected handle orientation; storing kinetic energy in the force regulator by stretching a resilient member;

[0047] moving the wheelchair forward and decelerating to actuate the trigger mechanism; and

[0048] releasing the stored kinetic energy to propel the curling stone while imparting controlled rotation.H3. System Aspect

[0049] According to another aspect of the invention, a wheelchair-mounted curling stone propulsion system comprises:

[0050] a momentum-activated trigger mechanism configured to detect deceleration of a wheelchair and release stored kinetic energy;

[0051] a stone interface configured to engage a curling stone and impart controlled rotation during release; and

[0052] an adjustable force system configured to propel the curling stone with adjustable force levels,

[0053] wherein wheelchair motion serves as the primary user input for triggering stone release.BRIEF DESCRIPTION OF THE DRAWINGS

[0054] FIG. 1 is a perspective view of the entire device of the present invention.

[0055] FIG. 2 is a side view of a prior art wheelchair interfacing with the present invention, highlighting a chair mount and a trigger mechanism relative to the wheelchair.

[0056] FIG. 3 is perspective view of a proximal portion of the present invention where attachment via a chair mount is done, with parts 1A and 1B and with a rear chevron shaped mating portion. (1C).

[0057] FIG. 4 is a top view of the proximal portion of FIG. 3.

[0058] FIG. 5 is a side view of the proximal portion of FIGS. 3 and 4.

[0059] FIG. 6 is a front end view of the proximal portion of FIGS. 3, 4 and 5.

[0060] FIG. 7 is a perspective view of a Forward Chevron shaped mating portion (1D).

[0061] FIG. 8 is bottom view of the Forward Chevron shaped mating portion (1D) of FIG. 7.

[0062] FIG. 9 is a side view of Forward Chevron shaped mating portion (1D) of FIGS. 7 and 8.

[0063] FIG. 10 is a front view of Forward Chevron shaped mating portion (1D) of FIGS. 7-9.

[0064] FIG. 11 is a top cross section view of Inner Ram (2B) interfacing with Trigger Frame (3A) and Load Cell (4).

[0065] FIG. 12 is a side cross section view of Inner Ram (2B) interfacing with Trigger Frame (3A) and Load Cell (4).

[0066] FIG. 13 is a side view of Inner Ram (2B) interfacing with Trigger Frame (3A) and Load Cell (4).

[0067] FIG. 14 is a side cross section close up detail view of Ram Carriage (2B2) of FIG. 12.

[0068] FIG. 15 is a top close up detail view of Ram Carriage (2B2) of FIG. 11.

[0069] FIG. 16 is a side view of Ram Assembly (2).

[0070] FIG. 17 is a bottom view of Ram Assembly (2).

[0071] FIG. 18 is a top cross section view of Ram Assembly (2).

[0072] FIG. 19 is a side view of Ram Assembly (2) with Gear Box (5).

[0073] FIG. 20 is a side cross section view of Ram Assembly (2) with Gear Box (5).

[0074] FIG. 21 is a bottom view of Ram Assembly (2) with Gear Box (5).

[0075] FIG. 22 is a bottom cross section view of Ram Assembly (2) with Gear Box (5).

[0076] FIG. 23 is a side view of the Trigger (3A) and Actuator (3B), with the Safety Pin (3C2) in closed position.

[0077] FIG. 24 is a side view of the Safety Frame with the Safety Pin (3C2) in open position.

[0078] FIG. 25 is a front cross section view of the Trigger Frame (3A) and Actuator (3B) of FIG. 23.

[0079] FIG. 26 is a side cross section view of the Actuator Ball Tube (3B) of FIG. 23.

[0080] FIG. 27 is a side cross section view of the Trigger Frame (3A).

[0081] FIG. 28 is a top view of the force measuring Coad Cell (4).

[0082] FIG. 29 is a top cross section of Load Cell (4).

[0083] FIG. 30 is a side view of the Load Cell (4).

[0084] FIG. 31 is a side cross section of the Load Cell (4).

[0085] FIG. 32 is a top view for the Gear Box (5) with lid on.

[0086] FIG. 33 is a bottom view of the Gear Box (5), including the Lower Floor (5A7).

[0087] FIG. 34 is a front view of the Gear Box (5).

[0088] FIG. 35 is a perspective view of the Gear Box (5) with lid removed.

[0089] FIG. 36 is a crank side view of the Gear Box (5).

[0090] FIG. 37 is a top view of the Gear Box (5) with lid removed.

[0091] FIG. 38 is a top view of the Gear Box Drive Train (5B).

[0092] FIG. 39: is a perspective view of the Gear Box Drive Train (5B) with the Upper Floor (5A6) and lower Floor (5A7).

[0093] FIG. 40 is a perspective view of the Gear Box Drivetrain (5B).

[0094] FIG. 41 is a crank side view of the Gear Box Drivetrain (5B).

[0095] FIG. 42 is a front view of the Gear Box Drivetrain (5B).

[0096] FIG. 43 is a cross section side view of the Gear Box (5).

[0097] FIG. 44 is a top view of the Stone Arms (6B), Gear Box (5), Inner Ram (2B) and Tension Bands (2D).

[0098] FIG. 45 is a top of the Gear Box (5) and Stone Arms (6B)Floors.

[0099] FIG. 46 is a perspective view of the Stone Arms (6B) integrated with the Gear Box Floors (5A6 and 5A7).

[0100] FIG. 47 is a top view of the Gear Box Drivetrain (5B) and Stone Interface (6).

[0101] FIG. 48 is a perspective view of the Gear Box Drivetrain (5B) and Stone Interface (6).

[0102] FIG. 49 is a top view of the stone Handle Interface (6(C) with an illustration of interface with a prior art stone handle.

[0103] FIG. 50 is a perspective view of the stone Handle Interface (6(C) with an illustration of interface with a prior art stone handle

[0104] FIG. 51 is a side view of the stone Handle Interface (6(C) with an illustration of interface with a prior art stone handle.

[0105] FIG. 52 is a front view of the stone Handle Interface (6(C) with an illustration of interface with a prior art stone handle.

[0106] FIG. 53 is a side cross section view of the Trigger Frame (3A) in closed position, interfacing with the Ram Carriage (2B) and Safety (3C).

[0107] FIG. 54 is a side cross section view of the Trigger Frame (3A) and Safety (3C) in open position, with the Ram Carriage (2B) positioned just after the firing stroke begins.DETAILED DESCRIPTION

[0108] The following detailed component descriptions correspond to the numbered elements shown in FIGS. 1-54, with each component identified by its reference numeral and its connections to other components within the device assembly.

[0109] Now referring to the Figures, and more specifically to FIG. 1 and 2 wherein the device, of the present invention operates through a coordinated sequence involving all six main components working in unison. More specifically, there is shown the Wheelchair Interface (1), the Ram Assembly (2), the Trigger (3), the Load Cell (4), the Gear Box (5), and the Stone Interface (6). The Trigger (3) mechanism is positioned centrally within the device assembly, with the Wheelchair Interface (1) extending rearward to interface with the wheelchair. The Trigger (3) mechanism connects to the central spine portion referred to generally as the Ram Assembly (2). The LoadCell (4) provides a readout of the adjustable force that will be applied to the stone when the stone is propelled by the device. The Gear Box (5) provides the ability to increase the force to be applied by increasing the amount of winding up of the tension bands as the user's assistant cranks the Gear Box (5) using a socket wrench. The Stone Interface (6) provides for controlled application of the force and for controlled propulsion of stone. Each of these general function will be discussed in more detail in conjunction with FIGS. 3-54.

[0110] FIGS. 3-10 show details of the Wheelchair Interface (1). FIGS. 3 and 4 show the rear portion of the first component, the Wheelchair Interface (1) at the at the back of FIG. 3 are the Wheel Chocks (1(A). It consists of a plate on which the non-drive front wheels of the wheelchair is driven onto. And then there are two posts marked as component 1A3B and 1A3A. 1A3A is the inner posts and 1A3b is the outer posts 1A3A is shorter so that it interferes less with the wheelchair components. These upright posts marked as 1A3a and b provide a connection point to lash or affix the wheelchair frame to the Rear Chevron (1C) assembly so as to be moved as one with the wheelchair so that the person can impart the same forces on the device that the person can impart on their electric wheelchair through either use of a joystick or a straw or other means of controlling the electric wheelchair movement.

[0111] FIG. 4 is a view of the rear echelon from above. At the bottom of FIG. 4 are the plates on which the non-drive wheels are positioned to attach the device to the wheelchair.

[0112] Component 1C1 is an extension that extends out past where the user's footrests would be, so that it does not to any extent interfere with the wheelchair operation.

[0113] Component 1C4 is a clasp that receives a clamp that is on the forward Chevron that will allow the forward and rear Chevron to be integrated as one piece.

[0114] 1C2 is the actual Rear Chevron. This entire device will stay attached to the wheelchair while the user is on the ice. However, it is designed as a quick release system so that the user does not need to have the entire length of the device attached to the wheelchair while they are participating in the game, but not actually throwing a stone. It also allows for the device to be quickly detached from the Forward Chevron in case the user experiences anxiety or concern about having his wheel wheelchair attached to the device.

[0115] FIG. 5 shows the rear chevron assembly along with the wheel skids. that is a side view.

[0116] FIG. 6 is a view of the Wheel Chocks and the Chock Spreader (1B). The Clevis pins that are called out as 1B4 can be removed to allow the Wheel Chocks to slide in and out so that the device can be fitted to different widths of wheelchairs.

[0117] FIG. 7 is a three-dimensional image of the Forward Chevron component 1D8 or call out 1D8 is the clamp that connects with the clasp on the Rear Chevron. Component or call out 1E1 is a Teflon block that provides a surface for the Chevron to rest on the ice, holding the Rear and Forward Chevrons at the same elevation above the ice for the two Chevrons to easily mate up.

[0118] The Chevron shape allows the device to self-center as the Rear and Forward Chevron mate up. Call out 1D2, 1D3, 1D4, 1D5, 1D6 and 1D7 are all a welded single component that effectively is a receiver into which the main Ram Assembly inserts and then is bolted with four bolts that are through the holes that are shown in the image.

[0119] FIG. 8 is a bottom view of the Forward Chevron. It shows the bracing for the receiver components that are called out as 1D2 through 1D6.

[0120] FIG. 9 shows the clamp 1D8 for coupling with the rear echelon chevron shaped portion shown in FIGS. 3-6.

[0121] FIG. 10 shows the end view of the Forward Chevron portion with clamps 1D8 on each end for coupling with the Rear Chevron shaped member. The clamps 1D8 allow the user to detach the wheelchair from the majority of the invention and thereby allow the user to travel in the wheelchair, with the rear portion attached thereto, more easily when not on the ice and / or while waiting to share the remainder of the inventive device if that is shared among multiple users each with their own identical Rear Chevron attached to their respective wheelchairs. When referring to wheelchairs, this should be understood to include electric wheelchairs with manual joystick controls or oral breath straw type controls, non-electric wheelchairs propelled by hand and arm movements or other know propulsion types of wheelchairs.

[0122] FIGS. 11-13 show multiple views of the Inner Ram (2b) which is placed inside the Ram Assembly (2) that has two main components. The first one is the Inner Ram, which is the part that actuates by moving forward to propel the stone upon firing and then the portion of the ram assembly is the outer ram is comprised of two U channels, one on the bottom (2A2b) and one on the top (2A2a) that create a track for the Inner Ram to travel forward from the Trigger Frame (3A). The upper and lower U channels are held together with machine screws tapped through the Ram Walls Plates (2A3) and (2A4).

[0123] FIG. 11 is an image of the Inner Ram (2B1). It also shows the Ram Carriage (2B2). Also integrated in the Ram Carriage is the S beam (4A1) for the Load Cell. Also shown in FIG. 11 is the stone cradle (6A) that is a 3D printed component that interfaces with the center striking band at the vertical center of the granite portion of the stone. It is the component of the stone that that impacts with other stones and is the portion of the stone that component stone cradle (6A) imposes the main thrust upon as the stone is propelled forward using the present invention.

[0124] FIGS. 12 and 13 show alternate views of (2B1) of FIG. 11.

[0125] FIGS. 14-18 show more details of the Ram Carriage and the Ram Assembly.

[0126] FIGS. 14 and 15 are detailed images of the Ram Carriage and how the Trigger Clete (2B2a) and Push Back Bar (2B2b) integrates into the Trigger Frame (3A1). Call out 4A3 is the forward rod of the Load Cell, 3A3 is the pin that constitutes the pivot point for the trigger. 3A1 is the trigger frame. 3A2 is the bushing that allows for the trigger pivot point to sustain considerable stress.

[0127] 2B2B is the push back bar it is an extension that's ¼ inch by ¼ inch long that that is welded to the Trigger Cleat called out as 2B2A. As the as the Inner Ram is pushed backwards into the Trigger Frame, the push back bar (2B2B) pushes the Trigger Frame back to raise the Trigger Roller(3A6) thereby engaging with the Ram Cleat (2B2a) Also as the Trigger Frame is pushed back, the safety pin (2C3) is pulled by the spring (2C3) to the slots of the Safety Arch (3A5) and Safety Frame (3C1) when the slots line up so that the Trigger is locked into closed position, which prevents the Inter Ram from moving forward as it is being charged with tension on the Tension Bands until the device is ready to be fired.

[0128] Call out 2B2D is a band divider that is welded to call out 2B2C, which is the band bar. The band bar is what connects the Tension Bands into the Ram Carriage to pull the Inner Ram forward as the Tension Bands contract when the device is fired.

[0129] The Band Dividers, which are 2B2D, keep the Tension Bands on the Band Bar and prevent them from interfering with the rollers (2B2E), which are follower rollers tap screwed into the Band Bar; as the rollers travel along the outside wall of the upper and lower U channels of the Ram frame, they stabilize lateral movement so that the Ram Carriage stays directly centered in the Ram frame as it is actuating forward.

[0130] FIG. 15 shows call out 2B2F which is a piece of rubber called a Stop Bumper that is attached to the Band Bars. When the device is fired the Stop Bumpers cushion the impact of the Band Bar against the Ram Stop (2A5) in FIGS. 16 and 18. allowing for more subtle deceleration and smoother operation while minimizing stress on the components.

[0131] FIGS. 14 and 15 show the Inner Ram Tube (2B1, which is a three-quarter inch square aluminum tube that is bolted to the Ram Carriage with bolts called out as (2B2h).

[0132] In FIGS. 16, 4D1 is the nut on the end of the rear post of the Load Cell. 4A1 is the S beam of the Load Cell, which transmits date to a digital readout shown on FIG. 16 as an centrally disposed elongated rectangle on top of 2A2a. Further detail on the Load Cell construction is described in the Bill Of Materials.

[0133] FIGS. 19-22 show more details of the Ram Assembly (2) and Gear Box (5). The Tension Bands are shown as they wrap around the Band Bar on one end and the Gear Box Spindles (5B6).

[0134] FIGS. 28-31 show detail of the Load Cell. To operate, with no load on the trigger, the user's assistant will tighten the bolt (4D1) until the load sensor reads 1 lbs. This tells the user that there is just barely detectable stress on the Load Cell. FIG. 19 shows the Trigger pivot bolt in an oval shaped hole in the rear ram plate that allows the trigger pivot bolt to very subtly slide forward and backward about an ⅛ inch so that the Load Cell is measuring tension created by the Bands and not the pivot bolt pulling against the ram side wall. Referring back to FIGS. 31, 4A2 is the rear post that is the OEM hanging component that had the hook cut off and has been threaded to fit the bolt. 4A1 is the S beam, which is the device that actually measures the amount of tension being imposed upon it. 4A3 is the forward post that wraps around the trigger pivot bolt so that as tension is being applied by the Bands on the Band Bar (2B2c) and start trying to pull the Band Bar and thus the entire Inner Ram, the tension is transferred to the Trigger Cleat (2B2a), to the Trigger Roller (3A6) to the Trigger Frame (3A1) to the Trigger Pivot Pin (3A3) to the Load Cell forward rod (4A3)

[0135] The Load Cell S beam has the original OEM electrical wires that are fixed to it with an adhesive. Those come are soldered to Cat5e Ethernet wire (4C1) on FIG. 28. That Ethernet wire then goes into a RJ45 inline coupler (4C3). Then after, that another Ethernet connection runs from that coupler to the electronics shown as 4A5 in FIG. 19. The power supply for the load cell is called out as 4B, which is AA battery compartment that was cut out of the OEM case. Power from the batteries is transferred to the electronics using household phone wire.

[0136] FIG. 20 is a side image of the entire Ram Assembly, along with the Load Cell and the gearbox attached, shows the inline rollers (2C), source on the Bill of Material. The Inner Ram rests on those rollers to allow the Inner Ram to actuate forward and back freely. There are also two of the exact same rollers on top of the Inner Ram that are called out on FIG. 14 as 2C. On the inside walls of the forward ram wall plates, there also are (2C) rollers that provide lateral stabilization of the Inner Ram all the way through the stroke.

[0137] FIG. 53 shows a detail of the core trigger mechanism in a closed position, meaning that it is ready to be charged by an assistant and then fired by the user. The Safety Frame (3C1) is two pieces of steel plate cut into shape and screwed to the upper ram U channel on both sides of the Safety Arch (3A5). FIG. 53 shows the back bar (2B2b) pushed back into the Trigger Fram to close the Trigger. There is a very slight amount of play in that after it gets pushed back to allow for the mechanism to operate freely, but then, once tension is applied by the Tension Bands, the Trigger Cleat is pulled against the roller (3A6). The safety pin (3C2) is shown into the notches. Note how the notches do not line up in FIG. 54, so the safety pin is pulled against the Safety Arch but cannot stop the Trigger from rotating. The pin will stay the until the safety arch rotates back and a lot it creates lines up those slots for that pin to go into so that the safety is automatically locked into closed position when the Trigger is pushed back.

[0138] FIG. 54 shows the Trigger Frame (3A1) in open position. The pushback bar is shown just as a reference point, that could be either the second it's fired while it's traveling forward, or it could be just before it's pushed all the way back into the trigger to lock it into closed position. The pin at 3C2 and the spring at 3C3 are up on the top of the safety frame, to keep it out of the way until the assistant is ready to reset the system.

[0139] FIG. 23 shows the main Trigger Frame and Actuator system. The trigger stem (3B1) is attached with a bicycle cam clamp that is clamped at the bottom and top of the stem. The clamp at the top of the stem controls the pitch of the ball tube (3B6), which determines how easily the ball to move forward when the wheelchair decelerates thereby determine the level of sensitivity needed to fire the device: users with a very high level of control over their wheelchair might be able to utilize more finesse while users who have a lower level of control over the wheelchair may need to have the pitch increased to require more deceleration force to fire the device so as to avoid unintended firing. The clamp at the bottom of the stem attaches to the Safety Arch (3A5), and changes the pitch of the entire Actuator, thereby adjusting the amount of force pushing the Trigger into open position. The ball a 2-inch steel ball bearing (3B6), it is anticipated that that the size of that ball will decrease as greater experience is learned on the sensitivity of the device.

[0140] FIG. 25 shows the upper U channel (2A2a) and lower U channel (3A2b). Bearings (3A2) interface between the pivot pin (3A3) and Trigger frame core (3A1). Plastic bushings (3A4) center the entire Trigger assembly inside of the ram walls.

[0141] FIG. 36 is a side view of the exterior of the Gear Box. It mounts onto the upper and lower ram U channel as shown on FIGS. 19 and 20. FIG. 36 also shows the Tension Bands coming to spool around the Spindles (5B6), which are a 3D printed roller coils in the Bands to increase the tension after the Inner Ram is engaged with the closed Trigger. FIG. 22 shows an underside of the full length of the device, again showing those Bands how they roll around the spools.

[0142] FIG. 38 shows the Gear Box Drivetrain details. All of the various gear sizes are called out on the bill of material. The gearing steps down the amount of force so that it there are more revolutions on the bolt (5B1e) that the assistant operates with a socket wrench. As the gears are manually cranked, the energy through the horizontal shaft (5B1a), that rotation then passes through the miter gears (5B4) to turn the small gear (5B5c), that in turn rotates the large gear (5B5b), which is in line and attached to the spindles. 5B3 is a one way Rotary damper-it allows the Bands to freely spool out as the Inner Ram is pushed back into the Trigger but impedes the speed at which tension on the Bands is released when the pawl (5B1d) is released to reset the device.

[0143] FIG. 44 shows the stone arms (6B2), which connect inside the two floors of the Gear Box. The stone arm is welded to the hinge square (6B1). FIG. 17 shows the arm stops (2A7) which are angle brackets mounted to the side of the forward ram wall plate. These prevent the arms from closing such that the stone rollers (6B4). With the stone roll slightly separated, the assistant can easily push the stone through the rollers tight against the stone bumper (6A). The stone arms serve two functions. First, they hold the stone firmly against the stone bumper while the user is making final positioning for a shot. Again, the whole point of this is to allow the user to have as many of his or her own inputs as possible so that when they have a good shot, they get the positive feeling of accomplishing a difficult task. Then at the beginning of the firing stroke, the stone arms impede the initial acceleration of the stone so that it's more of a gentle acceleration rather than a rapid jumpstart to full speed. This increases accuracy and reduces recoil on the wheelchair.

[0144] FIG. 49-52 show the stone Handle Interface. A representation of an existing art stone handle is shown to illustrate the interface. The mechanism at 6C1a through 6C1c allows this stone handle interface to be raised up and down and forward and backward to accommodate different stone styles and sizes. When the stone is in place the assist rotates the stone handle inside the Handle Cradle (6C2a, 3-D printed) 45 degrees, which extends the spring (6C2b). During firing, as the stone clears the rollers and starts to separate from the stopped Stone Cradle (6A), the spring pulls the Handle Cradle (6C2a) back into its original position which imparts rotational force on the stone handle. The Handle Cradle can be rotated so that it imparts clockwise or counterclockwise rotation.

Examples

Embodiment Construction

[0108]The following detailed component descriptions correspond to the numbered elements shown in FIGS. 1-54, with each component identified by its reference numeral and its connections to other components within the device assembly.

[0109]Now referring to the Figures, and more specifically to FIG. 1 and 2 wherein the device, of the present invention operates through a coordinated sequence involving all six main components working in unison. More specifically, there is shown the Wheelchair Interface (1), the Ram Assembly (2), the Trigger (3), the Load Cell (4), the Gear Box (5), and the Stone Interface (6). The Trigger (3) mechanism is positioned centrally within the device assembly, with the Wheelchair Interface (1) extending rearward to interface with the wheelchair. The Trigger (3) mechanism connects to the central spine portion referred to generally as the Ram Assembly (2). The LoadCell (4) provides a readout of the adjustable force that will be applied to the stone when the stone...

CROSS REFERENCE TO RELATED APPLICATIONS

[0001] The present application claims the benefit of the filing date of provisional patent application having Ser. No. 64 / 002,873 filed on Mar. 11, 2026 and the provisional patent application having Ser. No. 63 / 770,189 filed Mar. 11, 2025 by the same inventor, which application is incorporated herein in its entirety by this reference.FIELD OF THE INVENTIONBackground of the Invention

[0002] The present invention relates generally to a wheelchair attachment configured to provide assistance to facilitate meaningful participation by a person in the wheelchair in the sport of curling.

[0003] Curling is a strategic team sport played on ice where players slide granite stones toward a target area to score points based on final stone positions. The sport requires precise control of both throw weight (propelling force) and stone rotation to achieve desired outcomes, with teammates often sweeping the ice to influence stone trajectory and distance.

[0004] Traditional curling involves players using their arms and wrists to propel stones down the ice sheet, imparting rotation during release to control the stone's curl direction. However, individuals with limited or no arm function, such as quadriplegics, have been unable to participate in this aspect of the sport using conventional techniques.

[0005] Some adaptive equipment exists for wheelchair users, such as delivery sticks operated by arm movement. Some of these delivery sticks have even had delivery stick head configurations to provide the capability to impart rotation on the stone. While these delivery sticks, with or without rotation inducing heads, are popular for some participants, they, are inadequate for individuals with severe upper body limitations.

[0006] Consequently, there remains a need for a device that enables persons with little or no arm function to competitively propel curling stones with similar precision and control as is normally available to fully able-bodied players.

[0007] The present invention addresses this need by providing a device that translates human inputs on the wheelchair movement into precise stone throws, allowing users with severe physical limitations to participate competitively in curling alongside able-bodied teammates while maintaining the strategic precision and competitive integrity that characterizes the sport, as well as provide the user opportunities for social interaction and a feeling of success by achieving difficult task through their own skill.SUMMARY OF THE INVENTION

[0008] It is an object of the present invention to provide a device that enables wheelchair users with limited or no arm function to competitively propel curling stones with precision and control comparable to able-bodied players.

[0009] It is a feature of the present invention to utilize wheelchair deceleration as a trigger mechanism for stone release without requiring hand or arm function.

[0010] It is an advantage of the present invention to provide intuitive control where natural wheelchair movement directly triggers stone release at the precise desired moment.

[0011] It is another object of the present invention to replicate the results of the wrist action of traditional curling delivery; for wheelchair users, who cannot perform such movements.

[0012] It is another feature of the present invention to include a handle assembly with a spring-biased rotatable cradle that imparts either clockwise or counterclockwise rotation to the curling stone upon release.

[0013] It is another advantage of the present invention to enable wheelchair users to achieve the same stone rotation control and curl characteristics (the curve-shape of the path of a stone, in motion, as it travels over the ice); as able-bodied players.

[0014] It is yet another feature of the present invention to provide an adjustable force regulator comprising tension bands selectively tension able to an infinite number of different force applications.

[0015] It is yet another advantage of the present invention to allow precise throw weight control through selection of tension band combinations, numbers, and attachment positions.

[0016] It is yet another advantage of the present invention to be able to digitally measure the amount of force that will be imposed on the curling stone when the device is fired.

[0017] It is still another feature of the present invention to include stone arms that provide progressive resistance during initial stone propulsion.

[0018] It is still another advantage of the present invention to minimize recoil against the wheelchair while ensuring efficient energy transfer to the curling stone.

[0019] It is even another feature of the present invention to provide a momentum-activated trigger mechanism with adjustable sensitivity.

[0020] It is even another advantage of the present invention to accommodate users of varying capabilities and wheelchair operating characteristics.

[0021] It is finally another feature of the present invention to include a wheelchair interface with capability for quick disconnection of the wheelchair from the most substantial and significant portion of the present invention to maintain game pace without interfering with other players or damaging equipment so that the user may participate in the same game with more able-bodied players.

[0022] The present invention is designed to achieve the above-mentioned objectives, include the previously stated features, and provide the aforementioned advantages.

[0023] In one embodiment, the device may include the following components and features:EXEMPLARY EMBODIMENTSA. Overall Device Architecture

[0024] According to one embodiment, a device for enabling wheelchair users to propel a curling stone comprises a device handle configured to engage a handle of the curling stone, stone arms configured to hold the curling stone in position, a ram configured to transfer kinetic energy to the curling stone, a force regulator configured to provide infinitely adjustable kinetic energy to the ram, a trigger mechanism configured to selectively release the ram which is responsive to a reduction in wheelchair speed, and a wheelchair interface configured to attach the device to a wheelchair. In this configuration, wheelchair movement is translated into controlled and repeatable stone propulsion, enabling users with limited or no arm function to participate competitively in curling.B. Wheelchair Attachment and Structural Backbone

[0025] According to an embodiment, the chair mount comprises an extension configured to interface with wheelchair footrests, adjustable skids configured to receive front wheels of the wheelchair, and attachment means configured to secure the wheelchair to the device. This mounting arrangement accommodates a range of wheelchair designs while providing stable alignment and rapid attachment and detachment during play.

[0026] According to an embodiment, the device further comprises ram assembly configured to function as a structural spine holding system components in fixed relation to one another, a ratchet mechanism configured to provide infinitely adjustable force provisionment, and a safety system configured to prevent unintended release of the ram during non-shot taking time periods.C. Energy Storage and Transfer

[0027] According to an embodiment, the force regulator is configured to be selectively adjusted to infinitely variable strengths to control a propelling force applied to the curling stone. This analog configuration allows fine tuning of throw forces to match the strategic requirements of competitive curling.D. Trigger and Momentum-Activated Release

[0028] According to an embodiment, the trigger mechanism comprises a frame configured to pivot between open and closed positions, rollers configured to interface with the ram cleats to prevent ram movement when in the closed position, a hammer actuator configured to actuate trigger release in response to wheelchair deceleration, and a safety mechanism configured to prevent unintended activation. This arrangement provides intuitive user control while maintaining operational safety.

[0029] According to an embodiment, the actuator comprises a tube containing a ball and a stop positioned such that, upon deceleration of the wheelchair, momentum causes the ball to travel forward and impact the stop, thereby moving the trigger mechanism to the open position. This design converts natural wheelchair stopping motion directly into precise trigger timing without requiring hand or arm actuation.E. Stone Positioning, Stability, and Recoil Management

[0030] According to an embodiment, the stone arms comprise rollers configured to interface with a outer edge of the curling stone, extension arms configured to maintain system and stone alignment, and a resilient member configured to pull the extension arms inward to center the curling stone. These features automatically align the stone while imposing resistance during initial propulsion to reduce recoil against the wheelchair and improve delivery accuracy and user comfort, while simultaneously permitting easy front loading of the stone by merely pushing into the extension arms until positioned to be pulled into the terminal end of the ram.F. Stone Handle Engagement and Curl Control

[0031] According to an embodiment, the handle comprises a cradle having a concave interface configured to engage the curling stone handle, a frame configured to hold the cradle in position relative to the stone, and a spring configured to impart rotation to the curling stone upon release. This configuration replicates wrist-driven rotation used in traditional curling delivery and enables controlled stone curl.

[0032] According to an embodiment, rotation is imparted to the curling stone as the stone separates from the handle assembly, enabling competitive-level curl characteristics without requiring arm or wrist motion by the user.G. Method of Use

[0033] According to an embodiment, a method for enabling a wheelchair user to propel a curling stone comprises providing a device having a handle, stone arms, a ram, a force regulator, a trigger mechanism, and a wheelchair interface; attaching a wheelchair to the device via the wheelchair interface; positioning a curling stone on the ice with the device located behind the stone; configuring the force regulator to provide an infinitely adjustable and digitally measured to a desired amount of propelling force; operating the wheelchair to align the device along a shot line; moving the wheelchair forward and decelerating at a selected position to cause momentum-activated trigger release; and allowing the force regulator to precisely propel the curling stone forward.

[0034] According to an embodiment of the method, deceleration of the wheelchair causes a ball within a actuator ball tube to move forward and impact a stop, thereby opening the trigger mechanism.

[0035] According to an embodiment of the method, resistance imposed by the stone arms during initial ram movement reduces recoil against the wheelchair.

[0036] According to an embodiment of the method, rotation is imparted to the curling stone during separation from the handle assembly.H. Device and Method Aspects of the InventionH1. Device Aspect

[0037] According to one aspect of the invention, a device for propelling a curling stone by a wheelchair user having limited arm function comprises:

[0038] a handle assembly configured to releasably engage a curling stone and impart rotation upon release;

[0039] stone arms configured to stabilize the curling stone and impose resistance during initial propulsion to reduce recoil;

[0040] a ram configured to transfer kinetic energy to the curling stone;

[0041] an infinitely adjustable force regulator configured to vary an amount of kinetic energy transferred to the curling stone;

[0042] a trigger mechanism configured to selectively release the ram in response to deceleration of a wheelchair; and

[0043] a wheelchair interface configured to releasably attach the device to a wheelchair.H2. Method Aspect

[0044] According to another aspect of the invention, a method for propelling a curling stone using wheelchair movement comprises:

[0045] providing a device having a handle assembly, stone arms, a ram, an adjustable force regulator, a trigger mechanism, and a wheelchair interface for releasably attaching a wheelchair to the device;

[0046] positioning a curling stone relative to the device with a selected handle orientation; storing kinetic energy in the force regulator by stretching a resilient member;

[0047] moving the wheelchair forward and decelerating to actuate the trigger mechanism; and

[0048] releasing the stored kinetic energy to propel the curling stone while imparting controlled rotation.H3. System Aspect

[0049] According to another aspect of the invention, a wheelchair-mounted curling stone propulsion system comprises:

[0050] a momentum-activated trigger mechanism configured to detect deceleration of a wheelchair and release stored kinetic energy;

[0051] a stone interface configured to engage a curling stone and impart controlled rotation during release; and

[0052] an adjustable force system configured to propel the curling stone with adjustable force levels,

[0053] wherein wheelchair motion serves as the primary user input for triggering stone release.BRIEF DESCRIPTION OF THE DRAWINGS

[0054] FIG. 1 is a perspective view of the entire device of the present invention.

[0055] FIG. 2 is a side view of a prior art wheelchair interfacing with the present invention, highlighting a chair mount and a trigger mechanism relative to the wheelchair.

[0056] FIG. 3 is perspective view of a proximal portion of the present invention where attachment via a chair mount is done, with parts 1A and 1B and with a rear chevron shaped mating portion. (1C).

[0057] FIG. 4 is a top view of the proximal portion of FIG. 3.

[0058] FIG. 5 is a side view of the proximal portion of FIGS. 3 and 4.

[0059] FIG. 6 is a front end view of the proximal portion of FIGS. 3, 4 and 5.

[0060] FIG. 7 is a perspective view of a Forward Chevron shaped mating portion (1D).

[0061] FIG. 8 is bottom view of the Forward Chevron shaped mating portion (1D) of FIG. 7.

[0062] FIG. 9 is a side view of Forward Chevron shaped mating portion (1D) of FIGS. 7 and 8.

[0063] FIG. 10 is a front view of Forward Chevron shaped mating portion (1D) of FIGS. 7-9.

[0064] FIG. 11 is a top cross section view of Inner Ram (2B) interfacing with Trigger Frame (3A) and Load Cell (4).

[0065] FIG. 12 is a side cross section view of Inner Ram (2B) interfacing with Trigger Frame (3A) and Load Cell (4).

[0066] FIG. 13 is a side view of Inner Ram (2B) interfacing with Trigger Frame (3A) and Load Cell (4).

[0067] FIG. 14 is a side cross section close up detail view of Ram Carriage (2B2) of FIG. 12.

[0068] FIG. 15 is a top close up detail view of Ram Carriage (2B2) of FIG. 11.

[0069] FIG. 16 is a side view of Ram Assembly (2).

[0070] FIG. 17 is a bottom view of Ram Assembly (2).

[0071] FIG. 18 is a top cross section view of Ram Assembly (2).

[0072] FIG. 19 is a side view of Ram Assembly (2) with Gear Box (5).

[0073] FIG. 20 is a side cross section view of Ram Assembly (2) with Gear Box (5).

[0074] FIG. 21 is a bottom view of Ram Assembly (2) with Gear Box (5).

[0075] FIG. 22 is a bottom cross section view of Ram Assembly (2) with Gear Box (5).

[0076] FIG. 23 is a side view of the Trigger (3A) and Actuator (3B), with the Safety Pin (3C2) in closed position.

[0077] FIG. 24 is a side view of the Safety Frame with the Safety Pin (3C2) in open position.

[0078] FIG. 25 is a front cross section view of the Trigger Frame (3A) and Actuator (3B) of FIG. 23.

[0079] FIG. 26 is a side cross section view of the Actuator Ball Tube (3B) of FIG. 23.

[0080] FIG. 27 is a side cross section view of the Trigger Frame (3A).

[0081] FIG. 28 is a top view of the force measuring Coad Cell (4).

[0082] FIG. 29 is a top cross section of Load Cell (4).

[0083] FIG. 30 is a side view of the Load Cell (4).

[0084] FIG. 31 is a side cross section of the Load Cell (4).

[0085] FIG. 32 is a top view for the Gear Box (5) with lid on.

[0086] FIG. 33 is a bottom view of the Gear Box (5), including the Lower Floor (5A7).

[0087] FIG. 34 is a front view of the Gear Box (5).

[0088] FIG. 35 is a perspective view of the Gear Box (5) with lid removed.

[0089] FIG. 36 is a crank side view of the Gear Box (5).

[0090] FIG. 37 is a top view of the Gear Box (5) with lid removed.

[0091] FIG. 38 is a top view of the Gear Box Drive Train (5B).

[0092] FIG. 39: is a perspective view of the Gear Box Drive Train (5B) with the Upper Floor (5A6) and lower Floor (5A7).

[0093] FIG. 40 is a perspective view of the Gear Box Drivetrain (5B).

[0094] FIG. 41 is a crank side view of the Gear Box Drivetrain (5B).

[0095] FIG. 42 is a front view of the Gear Box Drivetrain (5B).

[0096] FIG. 43 is a cross section side view of the Gear Box (5).

[0097] FIG. 44 is a top view of the Stone Arms (6B), Gear Box (5), Inner Ram (2B) and Tension Bands (2D).

[0098] FIG. 45 is a top of the Gear Box (5) and Stone Arms (6B)Floors.

[0099] FIG. 46 is a perspective view of the Stone Arms (6B) integrated with the Gear Box Floors (5A6 and 5A7).

[0100] FIG. 47 is a top view of the Gear Box Drivetrain (5B) and Stone Interface (6).

[0101] FIG. 48 is a perspective view of the Gear Box Drivetrain (5B) and Stone Interface (6).

[0102] FIG. 49 is a top view of the stone Handle Interface (6(C) with an illustration of interface with a prior art stone handle.

[0103] FIG. 50 is a perspective view of the stone Handle Interface (6(C) with an illustration of interface with a prior art stone handle

[0104] FIG. 51 is a side view of the stone Handle Interface (6(C) with an illustration of interface with a prior art stone handle.

[0105] FIG. 52 is a front view of the stone Handle Interface (6(C) with an illustration of interface with a prior art stone handle.

[0106] FIG. 53 is a side cross section view of the Trigger Frame (3A) in closed position, interfacing with the Ram Carriage (2B) and Safety (3C).

[0107] FIG. 54 is a side cross section view of the Trigger Frame (3A) and Safety (3C) in open position, with the Ram Carriage (2B) positioned just after the firing stroke begins.DETAILED DESCRIPTION

[0108] The following detailed component descriptions correspond to the numbered elements shown in FIGS. 1-54, with each component identified by its reference numeral and its connections to other components within the device assembly.

[0109] Now referring to the Figures, and more specifically to FIG. 1 and 2 wherein the device, of the present invention operates through a coordinated sequence involving all six main components working in unison. More specifically, there is shown the Wheelchair Interface (1), the Ram Assembly (2), the Trigger (3), the Load Cell (4), the Gear Box (5), and the Stone Interface (6). The Trigger (3) mechanism is positioned centrally within the device assembly, with the Wheelchair Interface (1) extending rearward to interface with the wheelchair. The Trigger (3) mechanism connects to the central spine portion referred to generally as the Ram Assembly (2). The LoadCell (4) provides a readout of the adjustable force that will be applied to the stone when the stone is propelled by the device. The Gear Box (5) provides the ability to increase the force to be applied by increasing the amount of winding up of the tension bands as the user's assistant cranks the Gear Box (5) using a socket wrench. The Stone Interface (6) provides for controlled application of the force and for controlled propulsion of stone. Each of these general function will be discussed in more detail in conjunction with FIGS. 3-54.

[0110] FIGS. 3-10 show details of the Wheelchair Interface (1). FIGS. 3 and 4 show the rear portion of the first component, the Wheelchair Interface (1) at the at the back of FIG. 3 are the Wheel Chocks (1(A). It consists of a plate on which the non-drive front wheels of the wheelchair is driven onto. And then there are two posts marked as component 1A3B and 1A3A. 1A3A is the inner posts and 1A3b is the outer posts 1A3A is shorter so that it interferes less with the wheelchair components. These upright posts marked as 1A3a and b provide a connection point to lash or affix the wheelchair frame to the Rear Chevron (1C) assembly so as to be moved as one with the wheelchair so that the person can impart the same forces on the device that the person can impart on their electric wheelchair through either use of a joystick or a straw or other means of controlling the electric wheelchair movement.

[0111] FIG. 4 is a view of the rear echelon from above. At the bottom of FIG. 4 are the plates on which the non-drive wheels are positioned to attach the device to the wheelchair.

[0112] Component 1C1 is an extension that extends out past where the user's footrests would be, so that it does not to any extent interfere with the wheelchair operation.

[0113] Component 1C4 is a clasp that receives a clamp that is on the forward Chevron that will allow the forward and rear Chevron to be integrated as one piece.

[0114] 1C2 is the actual Rear Chevron. This entire device will stay attached to the wheelchair while the user is on the ice. However, it is designed as a quick release system so that the user does not need to have the entire length of the device attached to the wheelchair while they are participating in the game, but not actually throwing a stone. It also allows for the device to be quickly detached from the Forward Chevron in case the user experiences anxiety or concern about having his wheel wheelchair attached to the device.

[0115] FIG. 5 shows the rear chevron assembly along with the wheel skids. that is a side view.

[0116] FIG. 6 is a view of the Wheel Chocks and the Chock Spreader (1B). The Clevis pins that are called out as 1B4 can be removed to allow the Wheel Chocks to slide in and out so that the device can be fitted to different widths of wheelchairs.

[0117] FIG. 7 is a three-dimensional image of the Forward Chevron component 1D8 or call out 1D8 is the clamp that connects with the clasp on the Rear Chevron. Component or call out 1E1 is a Teflon block that provides a surface for the Chevron to rest on the ice, holding the Rear and Forward Chevrons at the same elevation above the ice for the two Chevrons to easily mate up.

[0118] The Chevron shape allows the device to self-center as the Rear and Forward Chevron mate up. Call out 1D2, 1D3, 1D4, 1D5, 1D6 and 1D7 are all a welded single component that effectively is a receiver into which the main Ram Assembly inserts and then is bolted with four bolts that are through the holes that are shown in the image.

[0119] FIG. 8 is a bottom view of the Forward Chevron. It shows the bracing for the receiver components that are called out as 1D2 through 1D6.

[0120] FIG. 9 shows the clamp 1D8 for coupling with the rear echelon chevron shaped portion shown in FIGS. 3-6.

[0121] FIG. 10 shows the end view of the Forward Chevron portion with clamps 1D8 on each end for coupling with the Rear Chevron shaped member. The clamps 1D8 allow the user to detach the wheelchair from the majority of the invention and thereby allow the user to travel in the wheelchair, with the rear portion attached thereto, more easily when not on the ice and / or while waiting to share the remainder of the inventive device if that is shared among multiple users each with their own identical Rear Chevron attached to their respective wheelchairs. When referring to wheelchairs, this should be understood to include electric wheelchairs with manual joystick controls or oral breath straw type controls, non-electric wheelchairs propelled by hand and arm movements or other know propulsion types of wheelchairs.

[0122] FIGS. 11-13 show multiple views of the Inner Ram (2b) which is placed inside the Ram Assembly (2) that has two main components. The first one is the Inner Ram, which is the part that actuates by moving forward to propel the stone upon firing and then the portion of the ram assembly is the outer ram is comprised of two U channels, one on the bottom (2A2b) and one on the top (2A2a) that create a track for the Inner Ram to travel forward from the Trigger Frame (3A). The upper and lower U channels are held together with machine screws tapped through the Ram Walls Plates (2A3) and (2A4).

[0123] FIG. 11 is an image of the Inner Ram (2B1). It also shows the Ram Carriage (2B2). Also integrated in the Ram Carriage is the S beam (4A1) for the Load Cell. Also shown in FIG. 11 is the stone cradle (6A) that is a 3D printed component that interfaces with the center striking band at the vertical center of the granite portion of the stone. It is the component of the stone that that impacts with other stones and is the portion of the stone that component stone cradle (6A) imposes the main thrust upon as the stone is propelled forward using the present invention.

[0124] FIGS. 12 and 13 show alternate views of (2B1) of FIG. 11.

[0125] FIGS. 14-18 show more details of the Ram Carriage and the Ram Assembly.

[0126] FIGS. 14 and 15 are detailed images of the Ram Carriage and how the Trigger Clete (2B2a) and Push Back Bar (2B2b) integrates into the Trigger Frame (3A1). Call out 4A3 is the forward rod of the Load Cell, 3A3 is the pin that constitutes the pivot point for the trigger. 3A1 is the trigger frame. 3A2 is the bushing that allows for the trigger pivot point to sustain considerable stress.

[0127] 2B2B is the push back bar it is an extension that's ¼ inch by ¼ inch long that that is welded to the Trigger Cleat called out as 2B2A. As the as the Inner Ram is pushed backwards into the Trigger Frame, the push back bar (2B2B) pushes the Trigger Frame back to raise the Trigger Roller(3A6) thereby engaging with the Ram Cleat (2B2a) Also as the Trigger Frame is pushed back, the safety pin (2C3) is pulled by the spring (2C3) to the slots of the Safety Arch (3A5) and Safety Frame (3C1) when the slots line up so that the Trigger is locked into closed position, which prevents the Inter Ram from moving forward as it is being charged with tension on the Tension Bands until the device is ready to be fired.

[0128] Call out 2B2D is a band divider that is welded to call out 2B2C, which is the band bar. The band bar is what connects the Tension Bands into the Ram Carriage to pull the Inner Ram forward as the Tension Bands contract when the device is fired.

[0129] The Band Dividers, which are 2B2D, keep the Tension Bands on the Band Bar and prevent them from interfering with the rollers (2B2E), which are follower rollers tap screwed into the Band Bar; as the rollers travel along the outside wall of the upper and lower U channels of the Ram frame, they stabilize lateral movement so that the Ram Carriage stays directly centered in the Ram frame as it is actuating forward.

[0130] FIG. 15 shows call out 2B2F which is a piece of rubber called a Stop Bumper that is attached to the Band Bars. When the device is fired the Stop Bumpers cushion the impact of the Band Bar against the Ram Stop (2A5) in FIGS. 16 and 18. allowing for more subtle deceleration and smoother operation while minimizing stress on the components.

[0131] FIGS. 14 and 15 show the Inner Ram Tube (2B1, which is a three-quarter inch square aluminum tube that is bolted to the Ram Carriage with bolts called out as (2B2h).

[0132] In FIGS. 16, 4D1 is the nut on the end of the rear post of the Load Cell. 4A1 is the S beam of the Load Cell, which transmits date to a digital readout shown on FIG. 16 as an centrally disposed elongated rectangle on top of 2A2a. Further detail on the Load Cell construction is described in the Bill Of Materials.

[0133] FIGS. 19-22 show more details of the Ram Assembly (2) and Gear Box (5). The Tension Bands are shown as they wrap around the Band Bar on one end and the Gear Box Spindles (5B6).

[0134] FIGS. 28-31 show detail of the Load Cell. To operate, with no load on the trigger, the user's assistant will tighten the bolt (4D1) until the load sensor reads 1 lbs. This tells the user that there is just barely detectable stress on the Load Cell. FIG. 19 shows the Trigger pivot bolt in an oval shaped hole in the rear ram plate that allows the trigger pivot bolt to very subtly slide forward and backward about an ⅛ inch so that the Load Cell is measuring tension created by the Bands and not the pivot bolt pulling against the ram side wall. Referring back to FIGS. 31, 4A2 is the rear post that is the OEM hanging component that had the hook cut off and has been threaded to fit the bolt. 4A1 is the S beam, which is the device that actually measures the amount of tension being imposed upon it. 4A3 is the forward post that wraps around the trigger pivot bolt so that as tension is being applied by the Bands on the Band Bar (2B2c) and start trying to pull the Band Bar and thus the entire Inner Ram, the tension is transferred to the Trigger Cleat (2B2a), to the Trigger Roller (3A6) to the Trigger Frame (3A1) to the Trigger Pivot Pin (3A3) to the Load Cell forward rod (4A3)

[0135] The Load Cell S beam has the original OEM electrical wires that are fixed to it with an adhesive. Those come are soldered to Cat5e Ethernet wire (4C1) on FIG. 28. That Ethernet wire then goes into a RJ45 inline coupler (4C3). Then after, that another Ethernet connection runs from that coupler to the electronics shown as 4A5 in FIG. 19. The power supply for the load cell is called out as 4B, which is AA battery compartment that was cut out of the OEM case. Power from the batteries is transferred to the electronics using household phone wire.

[0136] FIG. 20 is a side image of the entire Ram Assembly, along with the Load Cell and the gearbox attached, shows the inline rollers (2C), source on the Bill of Material. The Inner Ram rests on those rollers to allow the Inner Ram to actuate forward and back freely. There are also two of the exact same rollers on top of the Inner Ram that are called out on FIG. 14 as 2C. On the inside walls of the forward ram wall plates, there also are (2C) rollers that provide lateral stabilization of the Inner Ram all the way through the stroke.

[0137] FIG. 53 shows a detail of the core trigger mechanism in a closed position, meaning that it is ready to be charged by an assistant and then fired by the user. The Safety Frame (3C1) is two pieces of steel plate cut into shape and screwed to the upper ram U channel on both sides of the Safety Arch (3A5). FIG. 53 shows the back bar (2B2b) pushed back into the Trigger Fram to close the Trigger. There is a very slight amount of play in that after it gets pushed back to allow for the mechanism to operate freely, but then, once tension is applied by the Tension Bands, the Trigger Cleat is pulled against the roller (3A6). The safety pin (3C2) is shown into the notches. Note how the notches do not line up in FIG. 54, so the safety pin is pulled against the Safety Arch but cannot stop the Trigger from rotating. The pin will stay the until the safety arch rotates back and a lot it creates lines up those slots for that pin to go into so that the safety is automatically locked into closed position when the Trigger is pushed back.

[0138] FIG. 54 shows the Trigger Frame (3A1) in open position. The pushback bar is shown just as a reference point, that could be either the second it's fired while it's traveling forward, or it could be just before it's pushed all the way back into the trigger to lock it into closed position. The pin at 3C2 and the spring at 3C3 are up on the top of the safety frame, to keep it out of the way until the assistant is ready to reset the system.

[0139] FIG. 23 shows the main Trigger Frame and Actuator system. The trigger stem (3B1) is attached with a bicycle cam clamp that is clamped at the bottom and top of the stem. The clamp at the top of the stem controls the pitch of the ball tube (3B6), which determines how easily the ball to move forward when the wheelchair decelerates thereby determine the level of sensitivity needed to fire the device: users with a very high level of control over their wheelchair might be able to utilize more finesse while users who have a lower level of control over the wheelchair may need to have the pitch increased to require more deceleration force to fire the device so as to avoid unintended firing. The clamp at the bottom of the stem attaches to the Safety Arch (3A5), and changes the pitch of the entire Actuator, thereby adjusting the amount of force pushing the Trigger into open position. The ball a 2-inch steel ball bearing (3B6), it is anticipated that that the size of that ball will decrease as greater experience is learned on the sensitivity of the device.

[0140] FIG. 25 shows the upper U channel (2A2a) and lower U channel (3A2b). Bearings (3A2) interface between the pivot pin (3A3) and Trigger frame core (3A1). Plastic bushings (3A4) center the entire Trigger assembly inside of the ram walls.

[0141] FIG. 36 is a side view of the exterior of the Gear Box. It mounts onto the upper and lower ram U channel as shown on FIGS. 19 and 20. FIG. 36 also shows the Tension Bands coming to spool around the Spindles (5B6), which are a 3D printed roller coils in the Bands to increase the tension after the Inner Ram is engaged with the closed Trigger. FIG. 22 shows an underside of the full length of the device, again showing those Bands how they roll around the spools.

[0142] FIG. 38 shows the Gear Box Drivetrain details. All of the various gear sizes are called out on the bill of material. The gearing steps down the amount of force so that it there are more revolutions on the bolt (5B1e) that the assistant operates with a socket wrench. As the gears are manually cranked, the energy through the horizontal shaft (5B1a), that rotation then passes through the miter gears (5B4) to turn the small gear (5B5c), that in turn rotates the large gear (5B5b), which is in line and attached to the spindles. 5B3 is a one way Rotary damper-it allows the Bands to freely spool out as the Inner Ram is pushed back into the Trigger but impedes the speed at which tension on the Bands is released when the pawl (5B1d) is released to reset the device.

[0143] FIG. 44 shows the stone arms (6B2), which connect inside the two floors of the Gear Box. The stone arm is welded to the hinge square (6B1). FIG. 17 shows the arm stops (2A7) which are angle brackets mounted to the side of the forward ram wall plate. These prevent the arms from closing such that the stone rollers (6B4). With the stone roll slightly separated, the assistant can easily push the stone through the rollers tight against the stone bumper (6A). The stone arms serve two functions. First, they hold the stone firmly against the stone bumper while the user is making final positioning for a shot. Again, the whole point of this is to allow the user to have as many of his or her own inputs as possible so that when they have a good shot, they get the positive feeling of accomplishing a difficult task. Then at the beginning of the firing stroke, the stone arms impede the initial acceleration of the stone so that it's more of a gentle acceleration rather than a rapid jumpstart to full speed. This increases accuracy and reduces recoil on the wheelchair.

[0144] FIG. 49-52 show the stone Handle Interface. A representation of an existing art stone handle is shown to illustrate the interface. The mechanism at 6C1a through 6C1c allows this stone handle interface to be raised up and down and forward and backward to accommodate different stone styles and sizes. When the stone is in place the assist rotates the stone handle inside the Handle Cradle (6C2a, 3-D printed) 45 degrees, which extends the spring (6C2b). During firing, as the stone clears the rollers and starts to separate from the stopped Stone Cradle (6A), the spring pulls the Handle Cradle (6C2a) back into its original position which imparts rotational force on the stone handle. The Handle Cradle can be rotated so that it imparts clockwise or counterclockwise rotation.

Examples

Embodiment Construction

[0108]The following detailed component descriptions correspond to the numbered elements shown in FIGS. 1-54, with each component identified by its reference numeral and its connections to other components within the device assembly.

[0109]Now referring to the Figures, and more specifically to FIG. 1 and 2 wherein the device, of the present invention operates through a coordinated sequence involving all six main components working in unison. More specifically, there is shown the Wheelchair Interface (1), the Ram Assembly (2), the Trigger (3), the Load Cell (4), the Gear Box (5), and the Stone Interface (6). The Trigger (3) mechanism is positioned centrally within the device assembly, with the Wheelchair Interface (1) extending rearward to interface with the wheelchair. The Trigger (3) mechanism connects to the central spine portion referred to generally as the Ram Assembly (2). The LoadCell (4) provides a readout of the adjustable force that will be applied to the stone when the stone...

Claims

1. A device for enabling a person with limited arm strength and mobility to participate in the sport of curling, comprising:A wheelchair interface having a first part configured for coupling to wheelchair, and a second part configured for coupling with a curling stone propelling device; and a quick connection for selectively coupling saif first part and said second part,A curling stone propelling device coupled to said second part, said curling stone propelling device having a plurality of tension bands;A device for placing the plurality of tension bands under pressure; andA trigger, which is activated by a deceleration characteristic of a wheelchair, where activation of said trigger results in propelling said curling stone with a predetermined force provided by said plurality of tension bands.

Images